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Who knows what % is ... but even with herd immunity it will not be all hunkydory — Biggest Q is how long and how robust will be the immune response ... lots of uncertainty here
Have read that we humans only have up to 6 months protection against harmless Coronaviruses
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Herd immunity reached during a pandemic doesn’t stop the spread
An ongoing pandemic doesn’t stop as soon as the herd immunity threshold is reached. In contrast to the scenario of a single person with chickenpox entering a largely immune population, many people are infected at any given time during an ongoing pandemic.
When the herd immunity threshold is reached during a pandemic, the number of new infections per day will decline, but the substantial infectious population at that point will continue to spread the virus. As Bergstrom and Dean noted, “A runaway train doesn’t stop the instant the track begins to slope uphill, and a rapidly spreading virus doesn’t stop right when herd immunity is attained.”
https://www.google.com/amp/s/theconversation.com/amp/herd-immunity-wont-solve-our-covid-19-problem-139724
Perhaps - if Fauci fears prove out and we hit 100k cases a day. Below estimate (Mayo) says 94% to achieve it... we’re at 6-10% prob. COVID almost as contagious as measles, the ex. Plus again who knows how long and how robust the initial immunity. Some data showing risk of reinfections, ie, a Vax wears off. Imo we’re in a COVID world for 1-2 years min while we hope the new pig flu strain also doesn’t get us.
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What percentage of a community needs to be immune in order to achieve herd immunity? It varies from disease to disease. The more contagious a disease is, the greater the proportion of the population that needs to be immune to the disease to stop its spread. For example, the measles is a highly contagious illness. It's estimated that 94% of the population must be immune to interrupt the chain of transmission.
https://www.mayoclinic.org/diseases-conditions/coronavirus/in-depth/herd-immunity-and-coronavirus/art-20486808
You and I would, like 1 in 2, but the other 50% likely won’t — read below ... hence the challenge of achieving herd immunity
Tx will always have a role as effective and actually administered Vax struggle to come online
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Why only half of Americans say they would get a COVID-19 vaccine
Not enough people would elect to get vaccinated to create a protective herd immunity effect, a survey suggests.
A new poll run by the Associated Press-NORC Center for Public Affairs Research found that of 1,056 Americans who were randomly surveyed, just 49 percent say they’re planning to get vaccinated if a COVID-19 vaccine becomes available. Another 31 percent said they weren’t sure, and 20 percent said they weren’t planning get the shot. It’s too early to know exactly what percentage of people we’d need to achieve herd immunity for COVID-19, but it’s likely to be somewhere between 70 and 90 percent. Even lower levels would certainly help—fewer potential carriers would make it harder for SARS-CoV-2 to spread from person to person—but it won’t stop the pandemic altogether.
https://www.popsci.com/story/health/covid-19-vaccine-poll/
All for Vax—just much easier said than done ... real Qs re how much protection, and for how long, antibodies will confer —if, a Big If, a majority of people even choose to get pricked by the needle
Fauci
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Fauci says Covid-19 vaccine may not get US to herd immunity if too many people refuse to get it
https://www.google.com/amp/s/amp.cnn.com/cnn/2020/06/28/health/fauci-coronavirus-vaccine-contact-tracing-aspen/index.html
In an interview Friday, CNN asked Fauci whether a vaccine with 70% to 75% efficacy taken by only two-thirds of the population would provide herd immunity to the coronavirus.
"No -- unlikely," he answered.
Fauci noted that "there is a general anti-science, anti-authority, anti-vaccine feeling among some people in this country -- an alarmingly large percentage of people, relatively speaking."
He said given the power of the anti-vaccine movement, "we have a lot of work to do" to educate people on the truth about vaccines.
"It's not going to be easy," he said. "Anyone [who] thinks it will be easy is not facing reality. It's going to be very difficult."
Antibodies — if only that was the approval bar for Vax... it’s not
50% efficacy against placebo
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Coronavirus vaccine developers now have some advice from the FDA: To win approval, any vaccine must be at least 50% more effective than placebo in preventing the disease.
FDA Commissioner Stephen Hahn plans to roll out that guidance at a Senate hearing today, the Wall Street Journal reports. It sets a bar about on par with a flu shot's performance in a good year—but it falls short of some expert recommendations for arresting the virus' spread.
The agency also won’t approve a shot based on its ability to create antibodies in patients’ blood, the WSJ reports. Experts don’t yet know how those antibodies translate to protection against COVID-19.
https://www.fiercepharma.com/vaccines/fda-to-require-at-least-50-efficacy-for-covid-19-vaccines-wsj
Ha just a dabbler - enjoy putting nose to newsprint, reading the journals - more science-y than seance-y, well, on most occasions
Arylamides.. looks like a few researchers, a select few, were researching antiviral properties circa and even before PYMX
Some more support for why BRI is prob doing what it’s been doing effectively against SARS-Cov-2 and likely other viruses
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1997
Arylamide Inhibitors of HIV-1 Integrase
https://pubs.acs.org/doi/10.1021/jm960449w
Based on data derived from a large number of HIV-1 integrase inhibitors, similar structural features can be observed, which consist of two aryl units separated by a central linker. For many inhibitors fitting this pattern, at least one aryl ring also requires ortho bis-hydroxylation for significant inhibitory potency. The ability of such catechol species to undergo in situ oxidation to reactive quinones presents one potential limitation to their utility. In an effort to address this problem, a series of inhibitors were prepared which did not contain ortho bis-hydroxyls. None of these analogues exhibited significant inhibition. Therefore an alternate approach was taken, whose aim was to increase potency rather than eliminate catechol substructures. In this latter study, naphthyl nuclei were utilized as aryl components, since a previous report had indicated that fused bicyclic rings may afford higher affinity relative to monocyclic phenyl-based systems. In preliminary work with monomeric units, it was found that the 6,7-dihydroxy-2-naphthoic acid (17) (IC50 = 4.7 µM) was approximately 10-fold more potent than its 5,6-dihydroxy isomer 19 (IC50 = 62.4 µM). Of particular note was the dramatic difference in potency between free acid 17 and its methyl ester 21 (IC50 > 200 µM). The nearly total loss of activity induced by esterification strongly indicates that the free carboxylic -OH is important for high potency of this compound. This contrasts with the isomeric 5,6-dihydroxy species 19, where esterification had no effect on inhibitory potency (23, IC50 = 52.7 µM). These data provide evidence that the monomeric 6,7- and 5,6-dihydroxynaphthalenes may be interacting with the enzyme in markedly different fashions. However, when these naphthyl nuclei were incorporated into dimeric structures, significant enhancements in potencies each relative to the monomeric acids were observed, with bis-6,7-dihydroxy analogue 49 and bis-5,6-dihydroxy analogue 51 both exhibiting approximately equal potencies (IC50 values of 0.81 and 0.11 µM, respectively).
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2012
T7 Evaluation of antibacterial and antiviral activity of N-arylamides of 9-methyl-and 9-methoxyphenazine-1-carboxylic acids-inhibitors of the phage T7 model transctiption.
LG Palchykovska, OV Vasylchenko, MO Platonov, VG Kostina, MM Babkina, OA Tarasov, DB Starosyla, SP Samijlenko, SL Rybalko, OM Deriabin, DM Hovorun
Biopolymers & Cell 28 (6), 2012
Aim. Search for compounds with antibacterial and antiviral properties among N-arylamides of 9-substituted phenazine-1-carboxylic acids (PCA), inhibitors of the RNA synthesis. Methods. Influence of N-arylamides on the RNA synthesis was tested in vitro in the model system of the DNA-dependent RNA polymerase of phage T7 (T7 RNAP). Antimicrobial activities of the N-arylamides against bacteria Erysipelothrix rhusiopathiae VR-2 var. IVM, Klebsiella spp. and Escherichia coli ATCC25922 were investigated by the method of two-fold dilution in a liquid medium. Antiviral effects against Bovine Viral Diarrhea Virus (BVDV) and cytotoxicity of the N-arylamides were evaluated using Madin-Darby bovine kidney (MDBK) cells. Results. Twenty N-arylamides appeared to be efficacious inhibitors of the RNA synthesis at concentrations of 0.48-61 µI. The compound 16 proved to be the most effective inhibitor of T7 RNAP with the IC50 value being 0.48 µI. Fourteen N-arylamides demonstrated antibacterial properties against gram positive and gram negative bacteria at the 0.1-10 µg/ml concentrations. A number of the N-arylamides revealed a multiplicity of their antimic-robial actions: 7 compounds against two bacteria and two compounds, 2 and 3, against three bacteria investigated. N-arylamides 16 and 26 showed high inhibitory activity as to BVDV with the IC50 values 0.43 and 0.88 µg/ml and SI values 160 and 10 correspondingly. Conclusions. The obtained data evidence that the most likely targets of the N-arylamides 9-substituted PCA in bacteria and viruses are their RNA synthesizing complexes.
Young and Invincibly Dumb (?) ones driving new infections
https://www.usatoday.com/story/news/2020/06/26/covid-19-surge-featured-rapid-growth-among-younger-people/3258221001/
Also reading the CDC data likely up to x10 more cases than currently reported, with *only* 5-6% of people in the U.S. having been infected... still scary Qs around one might be at risk of being re-infected
Time to BRIng on our BRIlliantly designed BRIonic Drug
Using AI to Find Peptide Therapeutics for COVID-19
These computational efforts coming about 2 decades after the PYMX scientists got there first... and BRI is non-peptidic — huge advantage given difficulty stabilizing and cost to manufacture
Still is more proof BRI highly likely to plat a role in fighting COVID 19
The science is there
The funding should follow
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https://www.biospace.com/article/using-ai-to-find-peptide-therapeutics-for-covid-19/
By now, I’m sure you know the breakneck pace researchers are moving to find drugs and develop a vaccine against SARS-CoV-2, the novel coronavirus that causes coronavirus disease 2019 (COVID-19).
Nuritas, a biotech company that focuses on leveraging artificial intelligence (AI) to discover therapeutic peptides, is joining the fight by tasking their powerful AI platform to find peptides that can be used as therapeutics for COVID-19.
“We apply AI to the largely untapped landscape of peptide chemistry to find peptide therapeutics,” Nora Khaldi, Ph.D., Nuritas CEO, Founder, and acting CSO, told BioSpace. “We aim to find bioactive, stable, cell-penetrating peptides with better bioavailability and activity against a target or pathway of interest.”
Why peptides?
Peptides, short amino acid chains (think small proteins), are vastly abundant in every living thing. They are the “Goldilocks” of molecules because of their size – not too small (like small molecules) and not too big (like biologics such as antibodies). They are big enough to bind cellular targets with a large binding pocket but small enough to enter into the cell, giving them access to many more targets inside the cell.
“Peptides can go after targets that small molecules and biologics can’t, like unstructured targets and targets with a large binding pocket,” explained Khaldi.
Despite their unique abilities and vast customizability, peptides have been largely unexplored as potential therapeutics. As of March 2017, there were only 60 approved peptide drugs on the market, with 155 more in active clinical development.
“We wanted to focus on peptides because they are the best natural way that our body communicates,” Khaldi added. “All the solutions to our medical problems are out there – we just haven’t found them yet.”
Nuritas’ AI platform
Nuritas’ Peptide Finder (??F) Platform combines a database with years of experiments on thousands of peptides with state-of-the-art machine learning (ML) architecture that can identify peptides active against a target or pathway of interest.
“We use the results of thousands of experiments we’ve done over the past five years along with data from our proprietary proteomics database and very carefully curated data from the scientific literature as training data for our supervised and unsupervised ML models,” Khaldi explained.
In addition to their in-house testing, Nuritas collects proteome samples from around the world to characterize via mass spectrometry, allowing researchers to identify and quantify peptides of interest amongst the 30 billion peptides that are typically present in a single proteome source.
Nuritas also uses software that can “read” scientific literature published online, automatically extracting meaningful, relevant data to add to their database. Data curators then parse through the extracted information to ensure its quality before adding it to the body of peptide data fueling the platform.
To begin the peptide searching process, you input what you are looking for, much like checking a bunch of tick boxes or filtering your search in a search engine. Once you have selected the desired peptide properties and identified the target, the algorithm will search the database and find peptides matching your search query.
The algorithm can perform both targeted and non-targeted searches, depending on if you know the target of interest or not. If a target is unknown, a pathway that you want to modulate, like one dysregulated in a disease, can be input into the AI algorithm. AI will find peptides that can modulate the desired pathway, enabling researchers to then conduct experiments in the lab to determine what each peptide is targeting within that pathway.
Once peptide hits are found, they are synthesized and tested in the lab. The test results are put back into the database and the algorithm runs again with this new information, generating even better-matched peptide hits. This process is repeated a few times before promising peptides are identified.
Over 60 percent of the peptides identified by the algorithm have the desired activity against the target once they are made and tested in the lab.
“You reduce the risks of drug development by incorporating toxicity, biorelevance, and target data into the initial peptide search, so you know those peptide hits bind to the desired target with a suitable toxicity profile,” Khaldi commented.
Verified peptide hits can be further optimized via computer modeling (called computational chemistry) to add desirable characteristics, such as increased stability of the peptide. These optimized peptides can then be made and tested in clinical trials.
In partnership with BASF, the Peptide Finder Platform identified the first AI-discovered anti-inflammatory product, called PeptAIde, which is a plant-based peptide cocktail designed to regulate inflammation after exercise.
Using their AI platform for COVID-19 drug discovery
Now, Nuritas is expanding their discovery efforts to explore a treatment to address the symptoms of COVID-19.
“There is currently a lot of research working towards a COVID-19 vaccine, which is great, but we also need to focus on finding therapeutics to treat people with COVID-19,” Khaldi said. “Even with a vaccine, there will be people who will get sick and need medicine.”
Nuritas is using its AI platform to search for peptides active against COVID-19 targets. They will have two projects focusing on COVID-19 peptide identification: one for identifying antiviral peptides that target how SARS-CoV-2 hijacks cells, and one for identifying peptides that locally reduce lung inflammation without suppressing the entire immune system.
For the first project, Nuritas researchers will be searching through a database of peptide drugs that have already been tested in clinical trials. By repurposing peptides that have already been studied in the clinic, they can rapidly move any SARS-CoV-2-active peptides into clinical studies for COVID-19.
SARS-CoV-2, like other coronaviruses, infects human cells by using the ACE2 receptor (and a few other enzymes, like proteases), then hijacks the cells to churn out more copies of the virus. The first project aims to identify peptides that block the virus at any point, from initial entry into the cell through the viral replication process. Scientists can identify peptides that bind to known targets and simultaneously identify new COVID-19 targets that can be modulated by peptides.
“In general, viruses hijack cells via protein-protein interaction,” Khaldi explained. “How do we stop that interaction and, ultimately, the virus from hijacking the cell? The best way is by using a peptide.”
It will take 4-5 months to find peptide hits using the AI platform. Once promising peptides are found, they will be made or obtained from the company who originally made the peptide and passed along to collaborators who can test the peptides on COVID samples and tissues.
The second project is longer-term and aims to address the lung issues that coronavirus patients face while acutely sick and after recovering. A 15-year follow-up study on 78 severe acute respiratory syndrome (SARS) patients in China showed that lung fibrosis was a long-term issue.
Certain immune markers of inflammation, such as interleukin-6 (IL-6) and tumor necrosis factor-alpha (TNF-alpha), are significantly elevated in COVID-19 patients. IL-6 inhibitors approved for other diseases are already being tested in clinical trials with COVID-19 patients, including tocilizumab (Actemra) in China, the U.S., and other countries, and sarilumab (Kevzara) in the U.S. and other countries.
However, IL-6 inhibitor drugs induce systemic immunosuppression. Nuritas aims to create a cocktail of inhaled peptides that directly reduces inflammation in the lung to normal levels without suppressing the entire body’s immune system. Ideally, COVID-19 patients would start taking the inhaled drug at the beginning of their symptoms to reduce the amount of inflammation and lung fibrosis before it gets worse.
Because the SARS-CoV-2 virus hijacks cells and impact’s the patient’s immune system in similar ways to other coronaviruses, any identified peptide drugs for COVID-19 may also be useful in treating other coronavirus illnesses, like SARS and MERS. A drug to treat lung fibrosis could also be used for other fibrosis-inducing diseases.
“It is obvious that more than one solution may be needed to mitigate the impact of the COVID-19 pandemic and the Nuritas team is eager to leverage our proprietary AI platform,” Khaldi said in the company’s press release.
hedge fund managers should be on notice that the SEC continues to review social media postings and related securities trading.
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Although the allegations in this case relate to spreading false information and “fake news,” hedge fund managers should be on notice that the SEC continues to review social media postings and related securities trading. The SEC has issued alerts to investors and filed several enforcement actions over the last few years targeting social media and investing.[7] Hedge fund managers should also expect that social media scrutiny by the SEC will only increase. The SEC recently announced its intention to purchase an off-the-shelf social media monitoring tool “that provides emailed alerts to SEC staff based on keyword searches for relevant topics with ability to monitor social media sites, including but not limited to Facebook, Twitter, Instagram, YouTube, Google+, and LinkedIn, and provides the ability to monitor public forums message boards and public new sites.”[8]
https://www.lexology.com/library/detail.aspx?g=b6a691c1-f0fd-4815-81d6-ae047fe9c3e1
Hi Ho Silver Away!
I also always keep this quote in mind re we-all-know-who (and others):
"It is difficult to get a man to understand something, when his salary depends on his not understanding it"
BRI seems well on its way to greener pastures under golden skies... twd hopefully saving many lives along the way
COVID-19 never left and is re-emerging with a viral vengeance
We need multimodal BRI-onic to see what it might to do
Breakthrough Drug for Covid-19 May Be Risky for Mild Cases
That study about dexamethasone has arrived with a big asterisk: While it appears to help severely ill patients, it harms others.
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The drug — a cheap, widely available steroid called dexamethasone — does seem to help patients in dire straits, the data suggest. But it also may be risky for patients with milder illness, and the timing of the treatment is critical.
The drug “may harm some patients, and we’re not entirely sure which patients those are,” said Dr. Samuel Brown, an assistant professor of pulmonary and critical care medicine at University of Utah School of Medicine in Salt Lake City, who was not involved in the research.
https://www.nytimes.com/2020/06/24/health/coronavirus-dexamethasone.html
ditto, frustrating but BRI-Sci still here
more nuggets from another PYMX CEO intvw
like the excerpt below - about how so many have tried Rational Design, so difficult, but with DeGrado/Klein actually creating a biomimetic drug that works in BRI
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It’s been estimated that the total number of drug compounds that could possibly exist, the total number of drug structures that could possibly be designed, is about 1083, or one followed by 83 zeros. In the entire history of the pharmaceutical industry all the companies in the world in the last century have together made about 100 billion compounds. That as a percentage of total space is .0000000000000000000000000000000000000000000000000000000000000000000000001% of all possible structures.
So brute force doesn’t work and brute force will never work. Rational drug design is the only way that will ultimately work. While there have been many companies that have tried rational drug design, but most of those attempts haven’t been very successful.
So the only value of a computational technology is not the theory, but does it work?
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https://www.twst.com/interview/nicholas-landekic-polymedix-inc
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TWST: What is it about this technology that intrigued you?
Mr. Landekic: The heart of PolyMedix, what the company is trying to achieve with the technology tht Bill DeGrado and Mike Klein have created, is de novo design of biomimetic compounds. Biomimetics are organic compounds – polymers, oligomers or small molecules – that mimic the activity of proteins and peptides. Virtually all life functions, all biological processes, are controlled by proteins. Proteins turn things on, they turn things off; proteins make things happen. Most diseases have as their underlying cause a protein abnormality – either too much, too little or the wrong protein being produce.
There are many drugs that have developed that are proteins themselves. Insulin, very widely used for many, many decades is a protein. And there are other very successful and commonly used drugs, such as RheoPro, for clotting disorders, Procrit and Epogen to control side effects from cancer and kidney dialysis, and Enbrel for arthritis. These and many other protein drugs have aggregate sales of multiple billions of dollars.
Unfortunately, all protein drugs have some significant limitations. They can’t be take orally; they can only be given by injection. They’re very difficult and very expensive to produce. They’re unstable, so even if they’re given by injection, sometimes they break down very quickly in the body. The body can also have immune system reactions to proteins that cause the body to produce neutralizing antibodies that result in their losing effectiveness over time, sometimes limiting protein drugs to short-term use only. Despite that, many protein drugs have been developed and commercialized because organic small molecules just haven’t been able to do the job.
One of the Holy Grails of medicine is to come up with a stable, simple and easy to synthesize organic molecule, one that could be taken orally as a pill, and would function like a protein itself. This truly is one of the great Holy Grails of pharmaceutical research. The technology that Bill DeGrado and Mick Klein have developed achieves exactly this, using a variety of computational algorithms to mathematically design compounds which mimic the activity of proteins themselves. These compounds can be polymers, which are larger compounds that can be used as materials, and oligomers and small molecules, which ban be used as drugs. This, biomimetics.
When I had seen the success that they had achieved just the early stages of a year ago, it was light years beyond what I believe any other company has ever been able to achieve. I couldn’t say no, so we had to do this.
TWST: What are you focusing on?
Mr. Landekic: Our first commercial focus is on novel antibiotic drugs and bactericidal materials. Any computational technology is only as good as the products that it generates. The only thing that matters is, does it work. In the last 20 years there have probably been over 100 different companies that have been started trying to come up with rational drug design, ways of designing drugs on first principles, compared with the old fashioned way of using combinatorial chemistry and high throughput screening, which was basically making compounds by the hundreds of thousands and throwing a lot of things against the wall and seeing what sticks.
But that doesn’t work, and time and history have proven that the brute force methods don’t work,
and the big pharmaceutical companies acknowledge that it doesn’t work either. The reason it doesn’t work is that the total potential number of molecules that can exist is so huge. It’s been estimated that the total number of drug compounds that could possibly exist, the total number of drug structures that could possibly be designed, is about 1083, or one followed by 83 zeros. In the entire history of the pharmaceutical industry all the companies in the world in the last century have together made about 100 billion compounds. That as a percentage of total space is .0000000000000000000000000000000000000000000000000000000000000000000000001% of all possible structures.
So brute force doesn’t work and brute force will never work. Rational drug design is the only way that will ultimately work. While there have been many companies that have tried rational drug design, but most of those attempts haven’t been very successful.
So the only value of a computational technology is not the theory, but does it work? We have a lot of very complicated molecular dynamics, course grain, and force field algorithms underlying PolyMedix, but the only thing that matters is whether they work. Is it accurate, reliable, reproducible and consistent? Can we quickly, efficiently and cost-effectively get active molecules out of it?
The first target we’ve picked to focus on is to develop novel classes of antibiotic drugs, and with polymer derivatives, self-sterilizing materials. The target we’ve picked to work on is the human defenses. All multicellular life forms, all higher life forms, have what are called host defense proteins. This is the body’s first life of defense against bacterial, fungal, and now known to be also viral infection. These proteins are produced in every living creature at the site where bacteria or fungi enter the body. They’re potent, broad spectrum, and work uniquely by directly disrupting and rupturing bacterial cell membranes, so it’s virtually impossible for bacteria to develop resistance to them.
But because these are proteins, they have the same limitations that I mentioned a few moments ago of the difficulties in developing them as protein drugs. Several companies over the last decade and a half have tried to develop host defense proteins themselves as drugs, and have not succeeded because of the limitations of these proteins. Many companies have tried to come up with organic biomimetics of these host defense proteins, but have not succeeded either.
Coming up with a new mechanism of action for antibiotics is a major unmet medical need. Death due to secondary bacterial infections, what are called nosocomial infections, where you check into a hospital for something and pick up a bacterial infection and die of it, is now astonishingly the fourth leading cause of death in this country. After heart disease, cancer and stroke, you have a greater chance of dying from picking up a bacterial infection in a hospital than you do of anything else. Unfortunately, there isn’t a single antibiotic in use anywhere in the world today to which bacteria cannot develop, or have not already developed resistance.
There are infectious disease experts who are predicting that at the rate that bacteria are developing resistance to conventional drugs, in 10-15 years the world will be at risk of uncontrollable bacterial plagues, basically epidemics of bacterial infections for which there will be no effective treatment, like the Black Death of the 14th century that wiped out half the world’s population. So this is a major medical need and also a huge commercial opportunity — coming up with a novel way of killing bacteria using a mechanism to which bacteria cannot develop a resistance. The defensing mechanism of directly disrupting bacterial cell membranes, sort of like a needle going into a balloon, is such a mechanism.
Despite billions of years of evolution, bacteria are still susceptible to being destroyed by host defense proteins. That’s the reason why life was able to evolve on earth. So it’s a proven mechanism of action, but one that is crying out for a biomimetic compound, because the proteins themselves are just too unstable and not useful as drugs. And that’s exactly what we did. We’ve designed oligomer and small molecule compounds that do indeed replicate the function of defensins. They’ve potent and broad spectrum. We’ve tested them against more than 25 different bacterial strains, including strains of bacteria that are resistant to antibiotics, and they work against all of them.
They also have antifungal and antiviral properties and are very inexpensive and very easy to make. They’re safe, selective for bacterial cells, and don’t harm mammalian cells. Polymer derivatives of these compounds have been made, and we’ve shown that we can add them to paints, plastics and textiles to create products and surfaces that are intrinsically and permanently self-sterilizing by virtue of the material itself.
The first program that we’ve applied this technology to addresses a tremendous market opportunity, a huge medical need, and the first one that we’ll be commercializing and focused on developing. This will be the beginning for PolyMedix. Our goal is to develop these antibiotic products internally, to keep North American rights and use this as a core for building a specialty infectious disease business, and find partners to outlicense international rights to. We will also out-license all the materials applications to the polymers to materials and consumer products companies, and use that cash flow as a source of near-term revenues.
In the future, as we generate revenues we can apply this basic computational technology to other protein/protein targets. Our scientific Founder, Bill DeGrado, has already started work on several other projects, such as coming up with antidotes to over-dosages of low molecular weight heparins, another major unmet medical need; compounds that target integrin for bleeding disorders; Bcl-x for cancer; and several others as well. We’ll do the antibiotics first, get those commercialized, start making money with those, and then extend our technology and apply it to other protein targets with other biomimetic compounds.
Decades for polio Vax
10 yrs for Flu Vax
4 years for mumps Vax
HIV... so many other viruses = no vaccines — and all this coming from a Repub congressman, now, congressional testimony
We can all hope for a Vax
But deadly COVID truth gonna be a verrrrrry tough - effective Tx will be in uber high demand... Esp those w multiple MOAs, multiple modes of administration, and potentially able to be extended into all Coronaviruses and a lot more viruses
BRI is the only one w such potential
Just a matter time Gov and Industry wake up and pay up to save lives and save economies
Fauci: talking about neutralizing antibodies... essentially BRI main MOA by another name — shred that envelope in contact ... Ie kill it, then block entry of whatever virions are left over, and then inhibit whatever virions get inside the cell — BRI Big Three antiviral properties - plus the anti inflammatory and anti bacterial kick in: BRI anti Covid 19 potential: “Elementary, My Dear Fauci... Birks... Hahn”
Fauci reality checking Vax
Have to prove “truly safe truly effective” — fAgain - huge need for Tx... Vax are so hard to get right
Bri will only imo become a bigger and bigger Blip - Gov and Rx will jump in likely after Pub’d results anchor our BRI-ionic antiviral (and so much more) late stage drug
Smart money over Spin doctors
Challenge of Vax and Qs re Antibodies (Immunity)
Immunity to most coronaviruses gone with 6 months post-infection. Reports from China those with COVID-19 now without antibodies. Def some fear factor here re Vax, risk of reinfection/respreading uncertainty – esp given hard path to develop Vax... subject to mutation (unlike BRI), hit/miss possibly enabling the virus (unlike BRI), not all people willing to take, maybe 30% effective in older people, ie, treatments like BRI will be much needed/stockpiled IV.... best bang for buck as systemic; nebulizer?... to be used prophylactically... RemDes being developed for nebuzlier
RemDes nebulized
The company’s intention is very clear: reaching patients earlier, before their disease worsens and becomes harder to treat. “An inhaled formulation would be given through a nebulizer, which could potentially allow for easier administration outside the hospital, at earlier stages of disease,” O’Day said.
https://www.fiercepharma.com/pharma/gilead-to-start-testing-inhaled-remdesivir-eyeing-earlier-covid-19-use
https://blogs.sciencemag.org/pipeline/archives/2020/06/22/thoughts-on-antibody-persistence-and-the-pandemic
Certainty of success: three critical parameters in coronavirus vaccine development
https://www.nature.com/articles/s41541-020-0193-6
The nub: Similar to the four endemic coronaviruses, the quality and the durability of the protective immune response after natural infection with the three human epidemic coronaviruses appear to be “Low” or at best “Moderate”, the difference being that severe disease has been observed more frequently for SARS-CoV, MERS-CoV, and SARS-CoV-2 than the common cold human coronaviruses.
a Two-dimensional analysis of 29 major human viral pathogens based on incubation period (x-axis; time, in days or weeks, from exposure to clinical signs or symptoms) and broad, relative immunogenicity (y-axis; high, moderate or low—see reference1 for definition). The 17 viral pathogens for which vaccine efficacy have been established are depicted in boxes with gray backgrounds; those for which vaccine efficacy has yet to be established are depicted in ellipses with white backgrounds. The area of graph associated with higher “certainty-of-success” for vaccine development (light gray) and lower “certainty-of-success” (dark gray) are separated by a thick black line. (Reprinted from an open-access article licensed under a Creative Commons Attribution-NonCommercial 3.0 Unported License1. b Effect of low and high infectious inoculum intensity on the assessment of the “certainty-of-success” (CoS) of SARS-CoV-2 vaccines. Interval bar (white) reflect the uncertainty in the inherent broadly protective, relative immunogenicity (see Glossary of Key Terms) associated with SARS-CoV-2 natural infection. Double-headed arrow (white with black outline) reflects the effect of infectious inoculum intensity higher (light gray) and lower (dark gray) “certainty-of-success” for vaccine development.
PYMX CEO Perspective on BRI
Took a while for me to dig up - a long read but great insight into BRI disc/dev story
Transcript from a 2007 interview with Nik Landekic, CEO of PYMX at the time, for a radio program - lots of nuggets to mine below
Those PYMX scientists decades ahead of everyone else in developing their biomimetic polymers with Brilacidin the best of the best - their chosen lead compound
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Health Radio
Melanie Cole
Monday August 13, 2007 – 2:00 p.m.
Hey, how are you and welcome to Health Radio. We’re screening live worldwide as we always are and I’m so glad to be with you today. And, I’m glad you’re with me. If you want to be a part of the show today, you can call into the listener line at 877-711-5611. Or, you can send me an e-mail Melanie@healthradio.net. I love to get your e-mails before, during and after the shows. And, I imagine I’ll get plenty of them after today’s show, because I’m sure the questions are going to come rolling in. I must say I’ve been studying and I don’t want to sound like a complete nimrod, but I am telling you this is going to be a very interesting show. And, I hope you’ll follow me and take your pencils out and – and we can learn a lot together as that is what Health Radio really is. We’re taking complicated medical information. And, we’re making it understandable and accessible to the public and hopefully, even a little entertaining. If you’ve listened to my show, you know that sometimes it can be quite that. My guest today and I’m definitely honored to have him on is [Mr.] Nick Landekic. And, he is the President, CEO, Director and Co-Founder of PolyMedix. Welcome to the show [Mr.] Landekic. How are you?
DR. L: Melanie, it’s a great pleasure and honor to be here. I deeply appreciate your interest in PolyMedix. And, I appreciate the opportunity to tell you a little bit about our work. Thank you very much.
INT: Well, thank you. And why don’t we start with that so that my listeners can gain an understanding before we get into the products that you – you know are out there doing for us. What is PolyMedix? And, what are you guys doing?
[MR.] L: Well, from a big picture thirty thousand foot perspective, PolyMedix is based on proprietary computational drug design technology and are used in computer based models to design new types of drug compounds. This technology is specifically focused on creating small synthetic organic molecules, just like any other small molecule drug, but that mimic the action of large biological proteins. We acquired this technology from the University of Pennsylvania, where it was developed over many years in the laboratories of Doctor William DeGrado, Doctor Michael Klein, and Doctor Gregory Tew, members of the National Academy of Sciences and the American Academy of Arts and Sciences. We’ve taken this computer based drug design technology and applied it to our own commercial focus, which is focusing on serious life threatening acute disorders that are also significant market opportunities. Specifically, one of the primary areas that we’ve been focusing on is developing new antibiotic drugs. In particular, antibiotic drugs which have a completely different mechanism of action from current antibiotic drugs, to work in a way that would make bacterial resistance unlikely to develop. And, we also developed polymer formulations of these compounds for biomaterials to make paints, plastics and surfaces of self sterilizing.
INT: Now, I – I want to get into all of that. And, we’re definitely – I have a lot of questions about your self sterilizing polymers. And we’re – we’re going to talk about that now. Just tell me is PolyMedix is – is obviously global. And, that technology is fascinating to be able to use a computer to synthesize these biological proteins. So, explain to my listeners, what’s been the past problem with these marketed proteins that – that have been on the market before?
[MR.] L: Sure. It’s actually a very complex science, but I’ll try to make it so hopefully somewhat easily digestible.
INT: (laughing) That’s good.
[MR.] L: It’s complicated for us in the industry as well. Basically, proteins are the machinery of life. Living creatures, people, animals, we make things out of proteins. We build ourselves out of protein. Proteins turn things on, they turn things off, proteins make things happen. So, proteins are the natural chemicals that basically all life is based on. Everything that happens in a living creature, everything that you or I do, everything that we turn on or turn off in our bodies are based on proteins. Now, our bodies are able to build things out of building blocks called amino acids. You can think of them as the like the Lego building blocks of life. And, these amino acids are strung together in a very complex three dimensional shapes. And when they’re put together, they’re called proteins. Now, even though life uses proteins to build things and turn things on and off, our proteins are actually very, very complicated molecules. To make them artificially, to make them synthetically is very complicated. To try to use proteins as drugs is also very complicated. Some pharmaceutical companies, such as Amgen and others, have done a very good job of using proteins as drugs. Some of the largest pharmaceutical products in the world such as Epogen and Neupogen are protein products. But proteins themselves have a lot of limitations. They’re very difficult to make. They’re very, very hard to make synthetically. It’s very hard to trick bacteria or used to make proteins. And, they’re also very difficult to use as drugs. You can’t give them orally. They wouldn’t be active as a pill. So, you can only give them by injection. And many proteins, even when you inject them, are still very difficult to get as drugs, because the body recognizes them as foreign proteins and will reject them and break them down.
INT: You know that was a — well, I’m going to let you finish. But, that was a very good explanation of amino acids.
[MR.] L: Thank you.
INT: And – and what the – how we could use our proteins. And, I’m sorry, finish what you were going to say about them.
[MR.] L: So basically, the last part of the story is since proteins are so difficult to manufacture and to use as drugs, one of the greatest challenges, and also one of the greatest opportunities for many years in medicine, has been to make small synthetic organic molecules that are cheap and easy to make and have good drug like properties. Like any other drug that one takes as a pill or as an injection, but imitate and mimic the action of these proteins. The challenge has been is that proteins are very, very big molecules, because they’re large. Small molecules, as the name implies, are very small, so in making something small to do the job of something big is very, very hard. Some people have likened it to try to create a grain of sand that will have the same action as a sheet of newspaper. So, it’s wonderful if it can be done. But, it’s very difficult to do. And it’s very difficult to do unless we have the assistance of some pretty complex and sophisticated mathematical models and computer based drug design approaches, which is what PolyMedix is based on from the work at the University of Pennsylvania.
INT: And, are these the non protein drugs that you’re talking about?
[MR.] L: Yes. At PolyMedix, we don’t develop proteins. What we’re dedicated to doing is making small molecules, small synthetic molecules that imitate and mimic the action of these proteins. So, it would work like a protein, but are smallinexpensive, easy to make and have drug like properties. And, that’s also what we did with our antibiotic program is that we used these tools to create a new class of antibiotic drugs that imitate a class of proteins called the host defense proteins.
INT: And – and I want to ask you about the host defense. Why don’t you tell us? Because, is this the anti-infective drugs, the bacterial resistance that we’re talking about?
[MR.] L: Yes.
INT: The antibiotics, right?
[MR.] L: Yes. Yes, exactly. Exactly.
INT: So tell – tell – tell the listeners what the – what the implications for these antimicrobial drugs that you’re talking about, the new forms of antibiotics, right?
[MR.] L: Sure, absolutely. Absolutely. When Bill DeGrado and I started PolyMedix about five years ago, the first time we sat down to talk about what could we use these computational tools for? What kind of drugs should we create? There are many, many thousands of possibilities. But, over the course of the first lunch that we had over five years ago, we immediately settled on making small molecules that imitate these host defense proteins to make new classes of antibiotic drugs. Because, we recognized that that was a massive medical need, major clinical need as well as a very significant commercial opportunity. Everyone has heard about bacterial infections. But, many people are surprised to hear that bacterial infections are now the fourth leading cause of death in the United States. After heart attack, cancer, and stroke, we all have a greater chance of dying from a bacterial infection than from any other cause, over a hundred thousand deaths per year.
INT: And – and I – I want – I want to stop you there, because we’re going to take a break in just a minute. But, and – and I have a lot to talk about with the anti – with the bacterial infections and hospitals. But, this host defense proteins that you’re talking, those were first what, found on frogs right?
[MR.] L: They were first discovered on frogs, that’s right. And so what we’ve done at PolyMedix in this program is we’ve learned from the oldest and most effective antibiotic mechanism known, which is life itself. Primitive forms of live, things like molds and fungus, they secrete things like penicillin and tetracycline to protect themselves from bacteria. They produce antibiotics.
INT: So – so let me stop you, because we’re going to go to break. But when we come back, I’m going to ask you about these antibiotic sort of replacement drugs and the anti-infective drugs. And, this is fascinating stuff. And, you’re definitely making it very understandable. So, we’ll be back in just a minute. You’re listening to Health Radio. And, we are on with [Mr.] Nick Landekic. And, he’s the President and CEO, Director and Co-Founder of PolyMedix. We have a lot to discuss with him.
We’ll be right back. Don’t go anywhere. Stay tuned.
[COMMERCIAL BREAK]
Welcome back. And, we’re on today with [Mr.] Nick Landekic. And he is, as I said before, the President, CEO, Director and Co-Founder of PolyMedix. Fascinating, we are learning right now about they’ve – they’ve developed anti-infective drugs, which bacterial resistance is unlikely. As we all know, we keep hearing about the – the fact that antibiotics have stopped working in so many instances. And that, they found these host defense proteins on frogs. That’s where we left off at the break. And, [Mr.] Landekic, now you were saying that the antibiotic problem in this country is that really we’ve had so many infections that are unable to be controlled and that this anti-infective drugs will – will make it so that the bacteria don’t develop a resistance. Am I right about that?
[MR.] L: Well, we prefer to say resistance is unlikely to develop.
INT: Yes, unlikely.
[MR.] L: In life, unpredictable and strange things happen, so we prefer to say unlikely.
INT: That’s good, I’ll say that from now on.
[MR.] L: So, as you said Melanie, that bacterial infections are a massive problem. Bacterial infections actually are the fourth leading cause of death in this country, after heart attack, cancer and stroke, about a hundred thousand deaths a year. And, it’s one of the fastest growing causes of death the Centers for Disease Control tracks. In the United States, literally, someone dies from a bacterial infection every six minutes. And, the death rate has increased sevenfold over the past ten years. So, it’s a massive problem. And, the problem is only getting worse, because more and more bacteria are becoming resistant to known available antibiotic drugs. What we have done at PolyMedix is we’ve learned from and imitated the oldest anti-infective mechanism known, which is life itself. The primitive simple forms of life, things like mold and fungus, they produce things like tetracycline and penicillin. They produce the antibiotics that we now know to protect themselves against bacterial attack. And this forms the basis for all currently known antibiotic drugs. But, what they have in common is that they target what’s called a biochemical target, which means they often need to cross the outside membrane of the bacteria and get inside the cell to work. Now this works for a short while. But, the problem is that bacteria have ways of just developing resistance, of avoiding this kind of attack. Bacteria can sense when a foreign chemical has penetrated through its outer layer, through its skin, if you would have it. And, they can pump it right back out in a mechanism called efflux. So, the chemical is neutralized, because as soon as the bacteria senses that something foreign has come in, it gets pumped right back out. The other way that bacteria develop resistance to antibiotic drugs is they change the shape of the target that the antibiotic drug binds you. And that can happen very, very quickly. Bacteria can divide every ten to twenty minutes. If you start with one bacterial cell, in twenty-four hours you can have a million cells. So, beneficial mutations evolve very, very quickly. So, all the bacteria has to do is slightly change the shape and structure of this target that the drug is seeking to bind to. It’s similar to slightly changing the shape and structure of a lock. So, the key no longer fits into it. And again, you have resistance.
INT: That is just absolutely amazing what you just explained. So, these drugs would go inside the bacterial cell. But, the bacteria can either shoot it back out or multiply so that it just doesn’t have any effect on that one particular cell.
[MR.] L: Exactly. And it can happen alarmingly quickly. About two months ago, a group of researchers from Rockefeller University published a study looking at the case of what’s been called Patient X, a poor person that died of a drug resistant Staph infection. And, that’s seven years ago. Many, many people die of drug resistance Staph infections. But, what they found when they looked at this one patient, this one patient was treated over the course of twelve weeks with every known antibiotic and every possible combination. And, they still died. And, what they found was that in this one patient the Staph bacteria underwent thirty-five different mutations in just twelve weeks. It literally mutated every other day. That really rocked a lot of people back on their heels. People knew that bacteria divide very quickly. But, to have a bacteria in a single person be able to evolve so quickly, so rapidly, thirty-five times in twelve weeks was astonishing. It’s impossible to fight that with conventional antibiotics that act on biochemical targets. You need something completely new. You need something completely different. You need essentially a nuclear weapon of a drug.
INT: A nuclear weapon, that’s what it sounds like you’re describing is something that would go in there and not have the efflux reaction and be able to sort of blow away this bacteria without it giving it time to you know mutate, and – and to continually grow. And, I know that Staph infections, we keep hearing in the hospitals about Staph infections. And – and from hand washing, and all of these things. So would these be targeting specific bacterias like Staph? Or, would it be something that is more general that is going to be able to stop the bacteria even – even different kinds? Do you know what I’m asking?
[MR.] L: Yes, Staph is a big problem. More than half of infections in hospitals are Staph infections. But this mechanism can target many types of bacteria. Staph is the key target for us and a key problem in the world. But, these are broad spectrum drugs that can target many things. So what these drugs do, and what you had mentioned a few minutes ago before the break, the link to frogs. What we’ve done is we’ve imitated the antibiotic mechanism that is found in all animals and people and all higher forms of life. That mechanism is called host defense proteins. And, as you mentioned, that mechanism was first discovered about twenty years ago by Doctor Michael Zasloff in frogs. Doctor Zasloff found that frogs that he was working with would get cuts on their skin. And, he would put them back in these filthy disgusting aquariums that were just teeming with bacteria. But instead of getting infections and dying, the frogs healed. Their skin cuts healed very quickly. And they survived just fine. He was very curious about. What was happening? How could this be? So, what he found was the first discovery of the first host defense protein. Frogs produce something in their skin called magainins, and that is something that attacks bacteria in a very different way.
INT: That’s a Hebrew word, right? That’s a Hebrew word for shield.
[MR.] L: For shield, exactly. That’s exactly what it is.
INT: I knew that.
[MR.] L: And, what’s been found in the twenty years since Doctor Zasloff’s discovery is that basically any multi cellular life, plants, insects, fish, birds, animals, people, we all have host defense proteins, no just frogs. In people, these are called defensins. They’re very similar to the magaimins in frogs. With insects, they’re called cecropins or mellitins. Many different names for many different host defense proteins, but they all work the same way.
INT: And, where do they reside in humans? Where do the defensins reside? Where are they in us? Are they in our skin, in our blood, proteins? Where are they?
[MR.] L: We have them largely in our skin. We also make them in our mouths, in our mucosal tissues, in our genital tracts. We produce them at the point of infection. We produce them at the point where bacteria would get into our bodies. For example, we cut ourselves all the time. But, we usually don’t get an infection from it, because our bodies make host defense proteins at that point of a cut to kill the bacteria before they can get in to cause a system wide infection. All of these host defense proteins work the same way, whether they’re from people or from cockroaches. And, they all work completely differently from classic antibiotics. The host defense proteins don’t need to get inside the bacterial cell to kill a cell. They directly attack the cell’s membrane. It’s like a needle poking a hole in a balloon or a corkscrew going into a balloon. They directly attack the membrane, poking holes through it, forming what are called pores.
INT: So, they’re not trying to enter the membrane. They’re just poking a hole in it.
[MR.] L: Exactly. That’s exactly it. They disrupt the membrane. They associate with the membrane. Disrupt it. Form pores in it. Poke holes in it. And basically, it’s just like a needle can blow up a balloon while attacking the membrane with a bacteria and poking holes in it, you can blow up the bacteria and kill it very quickly and very effectively. So this mechanism works very well. Most of us don’t get infections. And, this mechanism has been around for, give or take, five hundred million years. And, it’s allowed higher life to evolve on earth.
INT: That is – that is absolutely amazing to me. And, the fact that you were able to computationally figure this out, right, this all came from being able to use computers for this technology?
[MR.] L: Exactly. This is all based on work by Doctors Bill DeGrado and Mike Klein figuring out how really do these host defense proteins work. And, building on the work of the great Doctor Michael Zasloff and others.
INT: So hang on, [Mr.] Landekic, because we are going to take another break. And, the show’s half over. It goes very quickly, especially when I’m so interested in a particular subject. Wow. And we’ll be back. You’re listening to Health Radio. And, we’ll be back talking more about this very interesting subject and PolyMedix. So, don’t go anywhere. Stay tuned to Health Radio.
[COMMERCIAL BREAK]
INT: Hey, here we are. Welcome back. And, I’m Melanie Cole. You’re listening to Health Radio. And send me an e-mail, Melanie@healthradio.net. I love to get them. We’re talking with [Mr.] Nick Landekic. He is the President, CEO, Director and Co-Founder of PolyMedix. PolyMedix – he gave us an explanation of this biotechnical company at the beginning of the show. And, right now, we are talking – we have been talking about the implications of the antimicrobial drugs or the new form of antibiotics. And, now [Mr.] Landekic, these are the antimicrobial peptides that you were talking about on – are defensins, right?
[MR.] L: That’s correct.
INT: So – so how are these going to now be put into application? You put them on computer. You make – you make these things that make these holes in the bacteria and – and go in for Staph and that sort of thing, and maybe some other bacterial – bacteria as well. How then, does it go from what you do to the pharmaceutical companies where they make these and do their clinical trials?
[MR.] L: Very good question. What we have done is used our computer drug design tools to design small artificial chemicals that imitate and work just like these host defense proteins. We synthesized and tested them in many, many animal experiments. And, at the end of this year, we hope to file our first what’s called an IND, an Investigational New Drug application, which will then allow us to start human clinical trials early next year. Now that really is the start of the FDA Regulatory and Review and clinical process to taking the drug through human clinical trials, so that ultimately it gets registered and available for marketing and for human use.
INT: Now, you’re not a pharmaceutical company. But, you partner with them, right? Is that how that works the biotech companies come up with this? And then, the pharmaceutical companies produce the drug? Is that how it works?
[MR.] L: Quite often. At PolyMedix, we’re already engaged in discussions with pharmaceutical companies for licensing of these antibiotic drugs as well as their polymer derivatives for biomaterials uses. What we plan to do at PolyMedix is to license all of the polymers, all of the non drug applications of these inventions. We also plan to license outside of North America rights to other pharmaceutical companies to market and sell these drugs. In North America, we hope to keep the rights of these antibiotics and sell them ourselves. We’ll hire and build our own marketing and sales capability and sell these ourselves. The first antibiotic drugs which we’re developing will be intravenous – will be IV drugs for use in hospitals to treat serious infections that are treated in hospitals, such as Staph infections. It’s not practical for a small biotech company to try to build a huge marketing and sales organization to reach every doctor in America to sell all antibiotics. But selling IV antibiotics to the hospital market is very doable and very practical. There are other companies out there doing that right now. So, we hope within a few years that we’ll have our own North American sales force selling our own IV antibiotics in this country. But, at the same time, partner with big pharmaceutical companies to sell them overseas as well as to sell oral formulations of our products for the primary care market.
INT: Now, you were saying that – that the – that the – these are the drugs you have to go through these investigational you know drug programs and, but for the polymers that you – that you mentioned. And, I wanted to ask you about them. So what are the applications for the antimicrobial polymers? These are for sterilization of surfaces and so because I know we were talking about Staph infections and the nosocomial infections that can go in like through – I worked – I worked at Northwestern Memorial. And you know when you do a central line or something like that, one of the big problems would be infection, right?
[MR.] L: That’s absolutely right. That is one of the very significant medical needs and commercial opportunities is for IV tubes and catheters. That was one of the other reasons we picked the antibiotic area to work in as our first product development program. In addition to developing the antibiotic drugs which we believe bacterial resistance is unlikely to develop, there are also polymer derivatives of these. So, our idea is to have more shots on goal. To have more ways of applying our same basic invention of the synthetic chemicals we’ve created to imitate these host defense proteins. With the polymers, the biomaterials applications, what we’ve done is we’ve shown that we can take polymer forms of these drugs and we can add them to paint, plastic and textiles to make materials and surfaces self sterilizing an antimicrobial. There are many, many potential applications of that. So, if we look at the world around us and think, where would it be good to have a surface that would be self sterilizing, that would kill bacteria on contact? It’s many places. There are many medical applications. As we’ve mentioned, catheters and IV tubes, bandages, surgical gloves and masks, many industrial applications, like coating the interiors of hospitals, restaurants, schools, many consumer products, such as soaps, lotions, cosmetics, contact lenses and contact lens cleaning solutions. The idea is to take these polymers and add them to these types of plastics and coating. So then that could make the material itself self sterilizing an antimicrobial.
INT: Now, do we know if these – if this polymer that you’re talking about is – I mean because we hear about different things that come. Is this going to be something that we’ll know is non toxic, is not – you know won’t – if you put it into a central line and – and we’re getting medications and blood and such through this, it’s not going to be toxic to our systems? Or you know do you understand what I’m asking?
[MR.] L: Those are very, very good questions. That’s something that through either an FDA or EPA process, one needs to evaluate and carefully study to look at the potential safety risks – what the potential toxicities would be? All drugs are toxic. There’s no such thing as a non toxic drug. They’re all toxic. The only thing that matters is, what is the ratio of the dose that works versus the dose that hurts? And, in this case, what we have to look very carefully at is; what is the ratio of the concentration that we need to kill bacteria versus what is the concentration that’s needed that would start hurting human cells? Using our computer based design tools, what we’ve done is we’ve created synthetic chemicals that not only imitate the action of these host defense proteins, but are actually more selective than our actual host defense proteins themselves.
INT: Well, [Mr.] Landekic, let me ask you. If these are synthetic, how do they mimic, if they’re self sterilizing polymer, it’s not live. Right? Like our defensins are. So how is that continue – how does it continually self sterilize?
[MR.] L: Now I understand. Our compounds work the same way as the defensin proteins. And, the way that they both work, to get into a little bit of the science, if you look at what the chemical structure of any host defense protein looks like, on one part of a molecule there are positive electrical charges. The other part of the molecule has chemical groups that are called hydrophobic, meaning they hate water and they love fat. It’s this combination of positive electrical charges and water hating fat loving properties. This is called facial amphiphilicity, that makes all of the host defense proteins have the ability to poke holes in bacterial cells. So, our compounds, both our small molecule drugs and our polymers, have that same kind of facially amphiphilic structure, the positive electric charges on one side of the molecule and these water hating fat loving properties on the side of the molecule. And, just like our natural defensin proteins, that gives them the ability to break bacterial membranes and poke holes in them. Because we’ve used computer based tools to design these compounds, we’ve been able to come up with compounds that are as much as a thousand times more selective and less toxic than even our natural host defense proteins. So, the safety and toxicity is something that we pay very, very close attention to, to make compounds that are safe and as selective as possible.
INT: And, what would be the shelf life on something like that? I mean if you – if hospitals were to use these polymers on things, it – would there be a limited time that they – you know you’d open the wrapper for the catheter. And it would be good for just so long?
[MR.] L: Well, there probably would be some lifespan.
Nothing lasts forever, except maybe love.
INT: Yes, not even that all the time Doc, not even that. But so – so – so they would have a certain life to which that polymer would be effective?
[MR.] L: That’s right. And how long that would last would in large part depend on how it’s attached to the surface. Is it attached to the surface of, for example a catheter, an IV tube? Or, is it mixed in throughout the plastic, so that even if the surface wears away there’s still a polymer in there. And part of it also would depend on what is this material exposed to? Plus, self sterilizing doesn’t mean self cleaning. So, if the surface got covered over, whether it’s with mud or dirt or something like that, the surface is covered up. The surface wouldn’t be available to interact with bacteria. So, it would have to be cleaned and renewed somehow. But, in our experiments, we’ve shown that when we add polymers to these types of plastics and coatings, in fact is long lasting. It does withstand repeated exposure to bacteria and keeps on killing. We can even store these materials in water for many weeks, and it keeps their activity. So, it doesn’t dissolve out of the material.
INT: Wow, that is – that’s amazing. That is amazing. I mean in one way it’s a little Howard Hughes-ish. Do you know what I’m saying? There’s a little bit of this wow; we’re going to really sanitize everything.
[MR.] L: Well, Howard Hughes wasn’t crazy. He was just ahead of his time.
INT: There you – that’s a great statement. Well, we’re going to take another break, the last break. I told you it goes fast. And when we come back, we’re going to get a little more information from – about PolyMedix. And, I’d like to ask [Mr.] Landekic also about the low molecular weight heparin that they are also working with. So, we’ll be back. Don’t go anywhere. This is really interesting. Stay tuned.
[COMMERCIAL BREAK]
INT: Hey; welcome back. You’re tuned to Health Radio. And, we’re streaming live worldwide as we always are. We’re on today with [Mr.] Nick Landekic. And, we’re talking about his company PolyMedix. And, before we go on about some of the other scientific things, [Mr.] Landekic, why don’t you tell people maybe where they can find out more about PolyMedix or any websites, things that you might you know find interesting for people to look for?
[MR.] L: If anyone is interested in learning more about PolyMedix, the best first spot probably would be visit our website, which is www.polymedix.com. PolyMedix spelled P-O-L-Y M-E-D-I-X. There are also links and phone numbers on the website, both with our public relations group and internally at PolyMedix. We always welcome any inquiries from anyone that’s interested in learning more about us.
INT: Well, I would certainly think you’re going to get millions and millions of responses now (laughing) after this show. Well, I hope that you do. It is very interesting. So, people can go to polymedix.com and find and scroll around on there. Because, I was on there for a long time. And, there’s a lot of information. And, pretty much what – what [Mr.] Landekic has been telling us today, but – but he certainly has gone into it so that we can understand more about it. And, for people that are out there suffering from infections or working in hospitals, or any of these kinds of things, this would seem to be a place to go to find out your information. Now, also you – one of the products that you guys have is the low molecular weight heparin. Now, I know about heparin, you know because that’s the antithrombotic for clotting. So, what is that you are talking about when you say low molecular weight heparin? What’s the difference?
[MR.] L: Actually, what we’re developing is a reversing agent for both heparin and a low molecular weight heparin. That’s our second drug program. We believe that to be a company, you need to do more than just one thing well. So, this is our second drug program. It’s very simple. Heparin and low molecular weight heparin, which many people are probably familiar with, are blood thinners. They’re used to prevent blood clots from forming. Heparin is used during many types of surgery, surgeries in the heart, lung and chest cavity, where you need to have heparin on board, because there’s a very high risk of a clot being formed during the surgery. And, that’s bad if a clot forms. It can lodge in the brain or the heart and cause a stroke or a heart attack, which can be fatal. Cardiothoracic surgeries have heparin being given to the patient. Now after the surgery, the heparin has to be reversed. Once the patient has been essentially cut apart and sewn back together again, they have to be able to clot and heal normally.
INT: Now, I understand this. I understand this and I – I don’t mean to interrupt you. But, because, I was part of bypass surgeries. So, you know and when we were – when I was working in Northwestern, and we – they always had to do that when they would take the vein. They would use the heparin. And then when they would take somebody off bypass, they had to reverse it. And, I guess I never really understood the implications of that. But, they had to stop – make sure that it would clot back up, so there wouldn’t be a bleeding.
[MR.] L: That’s correct. And, the only agent that’s available anywhere in the world to reverse heparin is something called protamine. Protamine has to be given so the patient can clot and heal normally. Otherwise, there would be a very significant risk of potentially fatal post surgical bleeding. Now protamine has been around for about fifty years. It’s been widely used for many, many years. But, it’s still a very difficult to use drug. There’s a lot of well known limitations. It’s very difficult to adjust the dose of protamine. If you overdose it, instead of reversing bleeding, you can make bleeding even worse. Even after clotting time has been normalized after protamine, protamine can still reverse its effect and have rebound bleeding. A significant overdose of protamine can be fatal. Protamine is a foreign animal protein. It’s made from of all things, the sperm of fish.
INT: Nice. (laughing)
[MR.] L: So many patients.
INT: (laughing) That’s nice.
[MR.] L: Literally. So, many patients can have allergic reactions, immune system reactions to protamine. And protamine also does not work on the whole class of clot preventers called the low molecular heparins. So, what we have done at PolyMedix is again using our core computational drug design technology, is we’ve designed and created synthetic small chemicals that imitate the action of protamine, but are designed to not have the side effects and problems that protamine does, to be used as agents that can reverse both heparin and for the first time low molecular weight heparin. But with a goal of not having to risk the problems of protamine, like bleeding. Not having allergic or immune system reactions. And, also being able to reverse the low molecular weight heparins, which protamine cannot do. So, it’s basically makes cardiothoracic surgery easier and safer for physicians by having a drug that’s safer and easier to use than protamine.
INT: Wow. And, who would have even thought that – that a drug like protamine would because of how it’s produced, would have allergic, but a lot of people are allergic to fish and such. And, I imagine that’s something if they’re going to go in for cardiothoracic surgery, that – that they have to find out before they go in there?
[MR.] L: It’s a problem. Now, we’ve spoken with cardiothoracic surgeons who have told us that for them the most difficult and dangerous part of the surgery is giving protamine, because you never know how a patient is going to react. And, even thought the allergic reaction rate is low, it can be less than one percent, but when it happens, it can often be fatal. So that’s a serious problem, which makes these surgeries much more difficult than they need to be. So, our goal is to have a drug that reverses heparin like protamine does, but doesn’t worsen the bleeding, doesn’t have these allergic reactions. And on top of that, can also be used for reversing the low molecular heparins. So to make the practice of medicine safer and easier, and to save money at the same time as well.
INT: And, what about the clinical trials of this low molecular weight heparin? How – how would that be – I mean you wouldn’t do it during surgery and since it’s a – it’s a sort of a surgical aid, how would you do clinical trials on that?
[MR.] L: Clinical trials would basically be to use our compound as an alternative to protamine. So, at the end of the surgery, at the end of a bypass surgery for example, a patient would be given our compound instead of protamine. So, the idea is to see if can we normalize blood clotting time. Heparin increases blood clotting. This makes the blood clot much more slowly, which is good during the surgery. But, afterwards, we want the blood to clot normally. The clinical study basically would measure blood clotting time when the patient goes into the surgery. Then, measure blood clotting time when they’re on heparin. Then, administer our test compound. And see if we can normalize blood clotting time. Can we bring it back down to normal levels? We’ve shown in many animal tests in rats, and mice and other animals, what we can do is completely normalize blood clotting time with just a single injection. We’ve also shown we can do the same thing in whole human blood. And, the next step now, as with the antibiotic program, is file the IND, so we can start human clinical studies, which we also hope to do early next year.
INT: And, because this is synthetic, it wouldn’t – it wouldn’t have the reaction. Now, has there been any controversy, [Mr.] Landekic, about the fact that these things are synthetic, your polymers and – and the antimicrobial, the anti infective drugs, is there – is there an advantage to the synthetic that because it doesn’t have allergic reactions, that sort of thing, or disadvantage, maybe I should ask you? We only have a couple minutes left. But, I wanted to ask you. Are there disadvantages to the synthetic versus the bio?
[MR.] L: The vast majority of drugs that we use, Melanie, are synthetic, whether they’re oral or IV. The vast majority of drugs, probably over ninety-five percent are synthetic. Synthetic compounds are small synthetic chemicals are usually much easier and much cheaper to make than proteins. They’re also generally much easier to give as drugs. One of the big problems with proteins is that the human body will recognize the foreign protein and reject it, which is what happened when people tried to use the animal host defense proteins as drugs. So, the human body rejected those. Proteins can be very specific, work in a very specific fashion. But, unfortunately, they also have all of these many disadvantages. So, on balance, because these are small molecules, synthetic chemicals are preferred because they’re cheaper and easier to make. They’re easier to formulate and administer as drugs, they’re usually the formulation of choice and the path of choice for developing a drug product.
INT: Wow; that’s just amazing to me. And – and I can see the far reaching implications of everything that we have discussed today. And – and I want to definitely thank you so much for being on with us. I think we learned a lot.
[MR.] L: Well, Melanie, it’s been such a privilege and such a treat and an honor to be able to talk to you and talk to your listeners about what we’re doing at PolyMedix. Thank you so much for giving us this opportunity.
INT: Well, I – I really appreciate it. And, I – I hope my listeners will go on to polymedix.com and scroll around and learn about what you’re doing, because this is technology of the future. And, it absolutely and now I suppose and so it’s absolutely fascinating to me. And, I hope my listeners enjoyed the show today. And, I want to thank again [Mr.] Nick Landekic of PolyMedix. And, you’ve been listening to Health Radio. So, thank you so much for listening. And, I hope that you will have a great day. And, we’ll be back again tomorrow on Health Radio. And, thanks again for listening. So, have a great week – have a great day. And, we’ll see you tomorrow. Thank you. Bye.
END OF INTERVIEW +++
Think the computational patents were set to expire 2022-2024 but not sure - always felt BRI was designed to do so many things so well... inc now it seems kill corona/viruses - a true credit to the noble/Nobel efforts of the PYMX group
The PhD / Post Doc / Post-Post Doc / Nat’l Acad of Sciences version of the Quantum Crunch backstory behind BRI - been meaning to post ... pulled from original PYMX website via an Archive Engine
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DeNovo Compound Design
PolyMedix is developing proprietary computational and synthetic chemistry approaches that we believe should be broadly applicable to developing novel small molecule therapeutic drugs for transmembrane protein targets and protein:protein interactions. The compounds and methods of design are de novo and proprietary, and provide a unique platform for the design of compounds that have been difficult to develop using traditional small molecule approaches. PolyMedix’s protein computational technologies were developed at the University of Pennsylvania.
PACE®
One of our de novo drug design non-downloadable software tools is called PACE®: Proteomic Assisted Computational Engine. PACE® is one of the non-downloadable software models we use in our de novo drug design and it is explained below. Our computational methodologies will be kept as proprietary trade secrets of PolyMedix. However, PolyMedix anticipates forming collaborations to develop drugs and targets for partners using its technologies.
De novo Design
PolyMedix’s lead scientific founder, Dr. William F. DeGrado, is well known as the pioneer of de novo design, an approach that involves the design of bioactive molecules from first principles. De novo design begins with a given molecular framework, and then adds functional groups (chemical appendages) to introduce properties of interest. As described below, de novo design involves three basic steps:
Selection of an appropriate framework in a low-energy conformation.
Addition of functional groups to this framework to provide a given biological activity.
Computational screening of the best combination of these functional groups, using a “potential function” to evaluate the fitness of each permutation.
An example is shown to the left, in which functional groups are built onto a helix (the framework) to elicit antimicrobial activity.
De novo design: The process of de novo begins with creating a molecular framework. Functional groups are then computationally added to elicit a given biological or physical property. In this very simple example, PolyMedix designed mimics of antimicrobial peptides in which positively charged sidechains and water-hating/fat loving (hydrophobic) sidechains were positioned on opposite sides of the structure. A computer algorithm is used to efficiently determine/test for the molecules that are able to bind to membranes.
SUCCEED®
Another example of the capabilities of PolyMedix’s computational technologies involves the water-solubilization of transmembrane proteins. PolyMedix has a unique and robust technology platform for designing water-soluble versions of membrane protein drug targets. This technology uses computational methods to predict alterations to membrane-anchoring protein surfaces in order to confer these surfaces with features that promote favorable interactions with water. These designed proteins possess remarkable water-solubility, increased stability, can be produced in high-yield, and most importantly, recapitulate the biological activity of the native membrane protein. This is the first technology capable of computationally designing membrane proteins for high resolution 3-dimensional structures for use in rational drug design. We call thisnon-downloadable software algorithm SUCCEED® (Statistical United Combinatorial Computational Environmental Energy Design). It is used to identify which amino acid residues on the external portion of the transmembrane region can be modified and replaced (with either natural or non-natural residues) to allow physical stabilization and water solubilization, and thus crystallization, of the entire receptor. This is done in a way that preserves the essential biological activity of the natural receptor. These crystal structures can then be used as a starting point for structure-based drug design (see section on Transmembrane Receptor Solubilization for additional information). SUCCEED® has been used successfully to water-solubilize two therapeutically relevant membrane proteins: phospholamban and a potassium channel. Recent work has also yielded encouraging results in designing a water-soluble version of the beta-2 adrenergic receptor. The SUCCEED® platform is applicable to a variety of membrane proteins, and is available for licensing to other companies for rational drug design research programs.
Another application of de novo design involves the design of molecules to inhibit protein:protein interactions. In this case, functional groups are appended onto a non-peptide framework to maximize the geometric and physical complementarity between the designed inhibitor and a protein target of interest. Such computationally designed molecules can be developed as inhibitors of protein:protein interactions.
GOLDYN®: New Force Fields
Force fields are required at many stages of de novo drug design. They are used in molecular dynamics simulations aimed at determining potential interactions of three-dimensional structures of molecules. One of the limitations of many currently available force fields is the inability to accurately account for solvent effects, that is, the effect of the environment (usually aqueous, water) on the interaction between the drug molecule and its intended target. Using a new, high-level ab initio quantum approach, Dr. Michael Klein and colleagues have developed a new force field to account for solvent effects, which was required because existing force fields either did not work accurately, or did not exist for many of the non-peptidic structures under development by PolyMedix. We call this non-downloadable force field software, which accounts for solvent effects, GOLDYN®. GOLDYN® stands for Global Optimization of Long-time DYNamics.
PolyMedix uses a variety of different force fields – some proprietary to the company – depending on the application. For the design of antimicrobial compounds, a course-grained approach is employed. By contrast, the design of inhibitors of protein:protein interactions requires a fine-grained approach. For these calculations we have developed a novel approach to implicitly treat solvent and other environmental effects, which are much faster to compute than traditional methods based on solvent accessibility.
Effects of Solvent:
Molecular Dynamics
Molecular dynamics calculations are used to model the interactions of drug molecules with their intended target over time. This is an important first step of the de novo drug design process to calculate low-energy conformations of the framework molecules. This method is also used to compute the structures of fully elaborated targets, prior to compound synthesis. Molecular dynamics also differs fundamentally from equilibrium free-energy (thermodynamic) methods. For example, antimicrobial activity is a non-equilibrium process, and it is therefore appropriate to focus on the time dependence of the specific interactions of target compounds with membranes.
Simply put—imo: once you really glob onto Defensins and their multiple MOAs (whatever the pathogen) it’s easy to see what they can do — that is to say when computationally designed to overcome the challenges that have plagued dev of the natural AMPs/HDPs... BRI has been delivering on the Promise whereas all the other attempts (Pexiganan, Omiganan) largely met with Peril, falling short of the PYMX Brain Trust to create our BRI-onic platform drug. Re that In Silico article - complex quantum docking of 11,000+ compounds spat out BRI as I think 3rd most promising to interfere w Mpro - main protease - replication... and this goes to the intracellular part of BRI likely MOA. BRI again, prior to infection, likely neutralizes and blocks, unlike most other antivirals. Anyway, based on recent share price action, The Sleeper has Awakened...
Ha you jest. Haven’t really found anything on antiviral — again think PYMX focused on ABX in antibiotic world. If BRI had been dev for sure would’ve tested antiviral - again BRI MOAs applies across all pathogens.
Forbes: Antibiotic Artisan (DeGrado Profile)
another bg read on BRI-lliance
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https://www.forbes.com/forbes/2011/0214/technology-william-degrado-chemistry-biotech-antibiotic-artisan.html#585dbcdbbdce
The biotech industry creates new drugs by making tweaks to natural proteins. University of Pennsylvania chemist William DeGrado is more of an artist than a tweaker. He has spent much of his career designing new proteins from scratch, a three-dimensional engineering task so complicated that until recently few scientists bothered to try. His goal is to create molecules unknown to nature but adept at serving humans by absorbing environmental toxins, fighting cancer or extending Moore's Law down to the atomic scale.
These applications are years away. But DeGrado's interest in creating artificial molecules that mimic more complex natural ones may have a more immediate payoff: a powerful new generation of antibiotics.
Scientists have known for decades that organisms as diverse as insects, frogs, pigs and humans make natural protein-based antibiotics to ward off microbes. These chemicals are one of life's most ancient defenses. They attack microbes in a unique way that makes it hard for resistance to develop.
Drugmakers have tried to bottle their power, but the compounds, known as antimicrobial peptides, have proven to be poor drugs. They are difficult to manufacture, unstable in the bloodstream and prone to toxic side effects. A drug based on pig chemicals failed to prevent pneumonia in hospital patients in a 2006 study. Another drug, from the African clawed frog, was rejected in 1999 by the FDA as a treatment for diabetic foot ulcers. Because of the peptides' high cost and unclear safety profile, "Big Pharma has abandoned them," says Georgetown University researcher Michael Zasloff.
DeGrado, with the help of a powerful supercomputer simulation, has created new antibiotics that mimic natural ones but are far simpler to produce and more stable. They capture the essence of animal antibiotics in molecules that are onequarter the size and can be made with standard chemistry techniques. The supercomputer work "was absolutely critical" in crafting the antibiotic, says DeGrado. "It narrowed the choices tremendously [and converted it] from an intractable problem to a feasible one."
The first antibiotic from this work is now in human trials at the biotech firm PolyMedix, which DeGrado cofounded in 2002. In animal tests PolyMedix's drug PMX-30063 is at least as powerful as the gold standard hospital antibiotic vancomycin at killing key strains. The initial effectiveness trial in staph skin infections could yield results this year.
New antibiotics are badly needed as bacteria become resistant to existing drugs. Because existing antibiotics target specific bacterial molecules, a mutation in the bacterium can render the drugs ineffective. One nasty bug inhabiting American hospitals, methicillin-resistant Staphylococcus aureus, is linked to 18,650 deaths each year, a 2007 study concluded. In contrast, the peptide antibiotics are less vulnerable to resistance because they infiltrate and damage the membrane that holds the bacterium together.
In 2000 DeGrado became curious about what was the simplest possible molecule that could mimic this membrane-infiltrating ability. He realized that the key was a two-sided structure. One side is attracted to negatively charged molecules on the surface of bacterial membranes. This, among other things, helps it to distinguish bacteria from human membranes, which have a less negative charge. The other side of the antibiotic contains an oily surface that is attracted to the greasy interior portion of the membrane.
Doodling on a scrap of paper with postdoctoral student Gregory Tew (now a professor at the University of Massachusetts), DeGrado came up with a crescent-shaped molecule that was somewhat similar to the polymer Kevlar used in bulletproof vests. He wasn't sure it would work, so he took it across the campus to molecular modeling expert Michael Klein. Klein took one look and was convinced that DeGrado was on to something. "I was so excited that I got [DeGrado] to sign and date the paper and gave it to my secretary" for safekeeping, recalls Klein, now at Temple University.
Klein devised a supercomputer simulation to predict in practically atomic detail what would happen when DeGrado's molecule collided with a bacterium's membrane. Each "frame" of the movie represents a fraction of a nanosecond and involves 1 million calculations. The simulation took nearly three months to perform at the Pittsburgh Supercomputing Center and revealed that DeGrado's instincts were on target. "What we discovered with the simulation is that these things dive into the membrane and swim around underneath," says Klein. "When there is enough of them they make their way to the other side of the membrane and make a pore." The bacterium's contents leak out. Lab experiments confirmed that this is what happens.
DeGrado and Klein published their initial results in 2002 and cofounded PolyMedix the same year. It took six years to design and test a molecule safe and effective enough to go into human trials. No resistance to PolyMedix' drug has emerged in standard lab tests. Klein says the continuous simulations give chemists confidence they are on the right track. "Our role is often psychological. A good scientist has intuition. If we can build a model that reinforces that intuition, they have confidence to extrapolate to the next level."
Wall Street remains skeptical. PolyMedix shares hover around a dollar. A key question is whether the drug will be able to distinguish bacteria from host as it goes about its killing business. PolyMedix Chief Executive Nicholas Landekic is optimistic--there have been no showstopper safety problems so far--but only big human trials can tell for sure.
Often wondered the same
COVID can kill you, me, gramps
Why not join the right side of the BRI fight and in the process maybe help save economies and lives?
Bygones
-over-
Bye Gone
The point is — vaccines often don’t work, often can have opposite effect (enable not disable transmission) and takes decades to do right. I’m all for Vax — just don’t count of them delivering anytime soon. And even w Vax, Tx still needed.
Like your scientific posts But dumb luck? Everywhere in the Defensin lit, going way back to 2000s, is data showing some Defensins (AMPs) have antiviral activity - I just think the PYMX group decided to focus on antibacterial like everyone else - talk of the antibiotic Apocalypse (still here) — and now the viral Armageddon ... has only been recently that the transition, in nomenclature, from AMPs to HDPs has happened and spread in academic circles; re Immunomodulatory effects for sure this has been underresearched re AMPs/HDPs - and still a lot of unknowns as to MOAs (tbt like a lot of drugs) - anyway posted an article a few weeks to this effect ... why we know so little about anti inflammatory / immune properties of AMPs/HDPs is that theyve mainly been studied in vitro (except for BRI) — AMPs/HDPs proving to be so much more than antibacterial ... and again makes perfect sense — the Host Defense Response is multifactorial, redundant and (mis)treats all invading pathogens the same way: “Get the hell out of my freaking house — disease-ridden cellular/viral strangers are not welcome!”
After much trial and error (deaths), with decades of legwork... some history of just how d hard it was to get polio vaccine over the line, safely-efficaciously
Why Vax, even pushed at Warp Speed by brilliant scientists, are still likely 1-2 years off — and how protective 30%? 50%? for how long ? will people get reinfected? Will the virus mutate in ways that make them ineffective?
Fauci and Birks hemhaw whenever asked about Vax
Qs to ponder - will be a big need for treatments and one that pulls multiple levers like BRI, if it proves out in trials, will have a Large than Life role to play (maybe against multiple viruses too) and hopefully alongside, yes, effective vaccines
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“But America’s experience with polio should give us pause, not hope. The first effective polio vaccine followed decades of research and testing. Once fully tested, it was approved with record speed. Then there were life-threatening manufacturing problems. Distribution problems followed. Political fights broke out. After several years, enough Americans were vaccinated that cases plummeted — but they persisted in poor communities for over a decade. Polio’s full story should make us wary of promises that we will soon have the coronavirus under control with a vaccine.
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Scientists knew polio was caused by a virus but did not know how it spread. (We know now that it was spread by consumption of food or water contaminated by the virus in fecal matter.) Then, as now, the only way to stay safe was not to be infected. Towns with cases closed movie theaters, pools, amusement parks and summer camps. They canceled long-planned fairs and festivals. Parents kept children close to home. Those who could afford to do so fled to the country. Still, cases mounted. **Among three early polio vaccines developed in the 1930s, two proved ineffective, another deadly.**
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But less than a month later, the effort ground to a halt. Officials reported six polio cases linked to a vaccine manufactured by Cutter Laboratories in Berkeley, Calif. The surgeon general asked Cutter to recall its lots. The National Institutes of Health asked all manufacturers to suspend production until they met new safety standards. Federal investigators found that Cutter had failed to completely kill the virus in some vaccine batches. The flawed vaccines caused more than 200 polio cases and 11 deaths.
The vaccine program partly restarted two months later, but more mayhem followed. With the vaccine in short supply, rumors spread of black markets and unscrupulous doctors charging exorbitant fees. One vaccine manufacturer planned to vaccinate its employees’ children first, and then sent a letter to shareholders promising their children and grandchildren priority access, too.”
Etc etc etc
https://www.google.com/amp/s/www.nytimes.com/2020/05/20/opinion/coronavirus-vaccine-polio.amp.html
COVID ain't no Flu - sobering reminder
So what happens if we compare apples with apples? A 2014 systematic review into influenza looked at infection-fatality rates calculated as deaths as a proportion of infected people estimated from serological testing — the main source of data for our COVID-19 estimate of 0.64% — and found that between 1 and 10 people died per 100,000 influenza infections. This gives an infection-fatality rate of 0.001–0.01%, which is quite a lot lower than even the lowest estimates for COVID-19.
In fact, if we take a reasonable range from most of the published research, it looks like COVID-19 has a fatality rate roughly 50–100 times higher than influenza. In other words, between 1 and 10 in 100,000 people who get the flu will die, but between 500 and 1,000 in 100,000 people who get COVID-19 will pass away.
As I said, comparing apples to apples, COVID-19 is MUCH deadlier than influenza.
https://medium.com/@gidmk/covid-19-is-far-more-lethal-than-influenza-69b6628e69f2
Man-made 'defensin' rips resistant bacteria apart
another blast from past -- mining some of my old posts (geez some of us have been here for almost a decade), will continue to post as i find the better ones - a refresher for all us longs, fact-based DD reading for new investors
BRI-Believing = BRI-Be-Living
the PYMX Brain Trust successfully able to build their own defensin that was better than the original (arguably) - kind of like Lee Majors and the bionic $6 million dollar man - though with BRI ... aka BRI-onic... becomes the $6 billion compound lol tho not that much of a stretch if BRI COVID BRI (enter platform indications) proves out
the great Ray Kurzweil even picked up the story back in the day
https://www.kurzweilai.net/man-made-defensin-rips-resistant-bacteria
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https://www.newscientist.com/article/dn13924-man-made-defensin-rips-resistant-bacteria-apart/
A mimic of the potent proteins used by white blood cells to punch holes in bacteria is to begin clinical trials in Canada. It could be a valuable new weapon against the growing threat of antibiotic-resistant “superbugs“.
Phagocyte immune cells that engulf bacteria use defensins to digest their prey. These small molecules are electrically attracted to the bacterium’s outer membrane, and fuse with it to create gaping holes that destroy invaders.
The complexity of bacterial cells’s outer membranes means they cannot easily evolve to become resistant to defensins. But attempts to harness them for medicine have struggled. Defensins are difficult and expensive to produce, and are typically destroyed by the host’s immune system before they can reach an area of infection.
Local effect
“They are not optimised to circulate around the body,” Bill DeGrado, a biochemist at the University of Pennsylvania, Philadelphia, US, told New Scientist. He decided that building his own defensin was the only solution.
His research team stripped down the structure of natural defensins to just the essential membrane-busting components, making one small enough to go undetected by the immune system.
They focussed on the split chemical personality that makes the molecules deadly to bacteria. They have one water-soluble end, and one water-repellent end with a positive charge. This draws the defensin to bacterial membranes like a targeted torpedo.
After settling on a simple ribbon-like structure, they enlisted the help of theoretical chemist Michael Klein at the University of Pennsylvania to check whether the proposed molecule could be stable.
Staying power
The simulated results were good enough to encourage DeGrado to build the molecule and set up a company, Polymedix, to develop it.
In a standard measure of the risk of bacteria evolving resistance to a new treatment, the defensin outstripped conventional antibiotics.
In the test, a sample of bacteria was given enough compound to kill 90% of the culture, with the survivors used to found a new one. The process was repeated, which drives the bacteria to evolve resistance.
“For conventional antibiotics, you generally find it takes 100 times more of the antibiotic to kill the bacteria after 9 repeats,” says Nick Landekic, Polymedix’s chief executive. “We’ve done 14 repeats with PMX-30063 and there is no change in its potency.”
“Really exciting”
Michael Zasloff at Georgetown University, Washington DC, US, was not involved with the work but plans to follow its progress.
“Their compounds are really exciting and look great, but the value of this class will be based on safety.” He says there is a chance that PMX-30063 may punch holes in human cells as well as bacterial ones.
“My concerns are with how it interacts with sites in the body known to be sensitive to damage by positively-charged peptides – areas such as the kidney and middle ear,” says Zasloff.
DeGrado and colleagues think the risk is low, saying their molecule is several thousand times more likely to target bacterial cells than it is to attack mammalian ones.
After a programme of animal testing the Canadian government’s regulator, Health Canada, this month gave the go-ahead to human clinical trials.
agree single trial - but think BRI could go after both mild/severe (arms) ... w IV delivered whenever standard protocol says patient go on IV (think 80% of COVID patients get IV), and w BRI delivering the 3x1 therapeutic effect (antiviral, anti-inflamm, antibacterial) in a single dose (though maybe multiple doses also under consideration)
and to the folks who say will cell results = translate to human ? well, BRI has done that so far... IV ABSSSI the most direct comparable... but the OM results (hamster to human) were good even if yet un-partnered -- to largely match the Galera results, which is IV systemic whereas BRI was oral rinse, x3 daily swish spit = impressive tho admittedly Galera trial 4x as big, why they got BTD
anyway, below WHO (i know, a curse word here) guidance; also hope IPIX does the trial right -- large (n=100+), placebo-controlled, randomized...... so if the results shine there will be no Qs as to signal, unlike, say RemDes other open label designs
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In response to the needs of the rapidly evolving COVID-19 outbreak, the Clinical Characterisation and Management Working Group of the WHO Research and Development Blueprint programme, the International Forum for Acute Care Trialists, and the International Severe Acute Respiratory and Emerging Infections Consortium have developed a minimum set of common outcome measures for studies of COVID-19. This set includes three elements: a measure of viral burden (quantitative PCR or cycle threshold), a measure of patient survival (mortality at hospital discharge or at 60 days), and a measure of patient progression through the health-care system by use of the WHO Clinical Progression Scale, which reflects patient trajectory and resource use over the course of clinical illness. We urge investigators to include these key data elements in ongoing and future studies to expedite the pooling of data during this immediate threat, and to hone a tool for future needs.
https://www.thelancet.com/journals/laninf/article/PIIS1473-3099(20)30483-7/fulltext
WSJ needs to update the BRI story
Another blast from past
More BG for newbies
This from 2006 — BRI so much farther along and now shredding the Coronavirus
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WSJ: START-UP COOKS UP A BACTERIA SLAYER (JAN 2005)
http://www.wsj.com/articles/SB110487454326216811
Full Story
A young Philadelphia company is aiming to develop an antibiotic drug that would kill bacteria once and for all. Researchers fight a continuing battle with bacteria, which adapt and eventually develop resistance to new antibiotics. Many of the world's bacterial infections become resistant to the drugs prescribed to fight them, and public-health advocates warn of a weakening pipeline of potentially life-saving antibiotics.
PolyMedix Inc., co-founded by University of Pennsylvania researchers, is targeting bacteria with synthetic molecules that mimic the activity of antimicrobial proteins that have a natural ability to prevent bacteria from developing resistance. "We believe that our antibiotic is unique," said PolyMedix President and Chief Executive Nick Landekic. The company believes it is the only one developing an antibiotic that uses synthetic molecules to mimic the mechanism of these "host defense proteins," which work by rupturing the skin of bacterial cells. "Our antibiotic directly breaks the bacteria cell membrane very much like a needle going into a balloon...and because of that there's a very low chance the bacteria can develop resistance to this," said Mr. Landekic, a pharmaceutical-industry veteran who helped form PolyMedix about 2½ years ago.
Conventional antibiotics must get inside the bacterial cell and target an enzyme, he explained. Bacteria develop resistance to such drugs by changing the target or simply pumping the antibiotic out of the bacterium, he said. PolyMedix says test-tube experiments demonstrate that bacteria don't develop resistance to the company's antibiotic, which works on infections in lab mice. The company believes it can start human clinical trials in a year if it secures the necessary financing.
PolyMedix says it identified its lead drug candidate in less than 18 months for less than $2 million. The company believes it can have its first antibiotic drug on the market in five to six years, for about $100 million. It has created 12 classes of antibiotics and selected several of them as candidates for human trials, Mr. Landekic said. "We've shown that they kill more than 80 different strains of bacteria. Actually, we haven't found any strain of bacteria that we haven't been able to kill with these compounds," Mr. Landekic said. The compounds have been effective on the biowarfare pathogens black plague, tularemia and 12 strains of anthrax, he said.
PolyMedix has raised more than $6 million from so-called angel investors -- wealthy individuals who advise start-up companies at their earliest stage -- and plans to seek $20 million to $25 million more from institutional investors this spring, with Legg Mason Inc. acting as its financial adviser, Mr. Landekic said. The university and the founding researchers have equity stakes in the business.
Assuming it gains the financing, the company hopes to file an investigative-new-drug application for its lead antibiotic with the Food and Drug Administration in December 2005 and would start clinical trials soon thereafter. The company, which says the world-wide market for antimicrobial drugs exceeds $30 billion, plans to first develop its antibiotic as an intravenous treatment, followed by oral and topical formulations. "This drug has multibillion-dollar sales potential and the opportunity to become the standard of care for hospital infections," the company says in an investor presentation. "Oral formulations have the potential to become the agent of choice in outpatient care of infections."
PolyMedix also will seek FDA approval for a sanitizing polymer hand lotion for doctors and nurses that it expects will prevent bacterial resistance, using the same protein-mimicking mechanism.
The U.S. Centers for Disease Control and Prevention in Atlanta has launched a campaign against antimicrobial resistance in hospitals, where, it says, nearly two million patients contract infections each year, and roughly 90,000 die as a result. More than 70% of bacteria that cause hospital-acquired infections are resistant to at least one of the drugs commonly used to treat them, the CDC says.
PolyMedix is weighing other polymer-based antimicrobial products, such as additives that could give paints, plastics and fabrics self-sterilizing surfaces. The company envisions licensing the technology for use in such products as bandages, catheters, food-preparation surfaces, toilet seats and uniforms, and is talking with many companies, Mr. Landekic said. For the drugs, PolyMedix aims to retain North American rights and license rights for the rest of the world to others. It has spoken with some pharmaceutical companies, he said.
Other researchers have developed drugs directly from proteins or smaller peptides -- chains of amino acids, the building blocks of life -- but protein-based drugs can be difficult and expensive to make and can't be taken orally. "We attempted to understand the molecular and biophysical basis for the action and then made molecules that are much smaller and much easier and cheaper to prepare," said William DeGrado, a professor of biochemistry and biophysics at the University of Pennsylvania's medical school, who is a PolyMedix co-founder and a member of its scientific advisory board.
Michael Zasloff, senior life-sciences analyst for Ferris Baker Watts and a professor at Georgetown University School of Medicine, said the implications of PolyMedix's technology are broad. "They've created a new class of antimicrobial substances, merging the design principles of polymers with the antibiotic or antimicrobial killing properties of some of nature's most potent anti-infectives," said Mr. Zasloff, who discovered an antimicrobial peptide he named magainin, from the Hebrew for shield, in the skin of a frog.
It is the mechanism of magainin-like proteins that PolyMedix is mimicking through synthetic molecules. If PolyMedix's antibiotics prove effective in oral form, "then they would have enormous potential," said Mr. Zasloff, who isn't involved with the company. Even if there were problems with the drugs, he said, PolyMedix may find broad applications for its synthetic antimicrobial molecules in other products.
would skyrocket IPIX fer sure
and the valuation number$ get way crazy if BRI actually does get across the finish line and get approved for COVID 19 esp if/as others fail -- one of the GoTo Tx variously formulated
RemDes estimated annual #s at $1-7.7bn and this for pretty mediocre results (desperate are we)
https://www.reuters.com/article/us-health-coronavirus-remdesivir/gileads-remdesivir-could-see-7-billion-in-annual-sales-on-stockpiling-boost-analyst-idUSKBN23A2MN
should BRI go on to be a Broad Spectrum Antiviral (the beauty of its multiple MOAs... likely extension into other viruses, ie, active against influenza... HDPs preclinically do show activity against flu) well, then, recall Tamiflu hit $3bn peak and had made Roche $15bn thru 2018
https://www.evaluate.com/vantage/articles/news/trial-results/roche-tries-again-new-pill-flu
back of the envelope value of BRI as a Go To Broad Spectrum Antiviral in a recently shocked COVID-19 world -- well it'd put the drug in Top 10 category in all likelihood
a ways to go but dreaming the non-peptidic defensin-mimic dream
PeptiDream and Merck partner to develop Covid-19 therapeutics
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Maybe BRI already on Merck radar ... ? ... into Peptides (lesser version of non-peptidic Defensin-mimetic BRI), a pan-Coronavirus focus (sounds familiar), and quite active on COVID Deal making front (Ridgeback, Deal post-publications)
As BRI continues to prove its computational-designed, already in-clinic and newly antiviral right stuff, they will come imo ... Gov, Rx, Pvt etc ... and likely have to pay up
https://www.pharmaceutical-technology.com/news/peptidream-merck-covid-19-therapies/
Japanese biopharmaceutical firm PeptiDream has partnered with Merck (MSD) to discover and develop new peptide therapeutics which could neutralise SARS-CoV-2, the novel coronavirus that causes Covid-19.
In April, PeptiDream launched a multi-pronged initiative to identify peptide candidates targeting various sites / regions of coronaviruses.
The partners intend to develop therapeutics with activity against the current coronavirus, as well as any future coronavirus outbreaks. The aim is to create drugs targeting several coronavirus strains.
PeptiDream noted that the partnership builds on the research collaboration and licence agreement signed between the companies in April 2015.
PeptiDream president and CEO Patrick Reid said: “We are excited to announce this partnership focused on the discovery and development of peptide candidates targeting multiple coronaviruses.
“Our wide-ranging collaboration continues to make exceptional progress and I am confident that together we can make an impact in combating this global challenge.”
Under the agreement, Merck will make an upfront payment to PeptiDream, which will also be eligible for select preclinical, clinical and regulatory milestone payments.
The Japanese company will also receive royalties on future sales of any therapeutics resulting from the collaboration; specific financial details were not disclosed.
Merck Discovery Chemistry research vice-president Emma Parmee said: “Our experience has shown that good science and strong collaborations are essential to develop medicines and vaccines, and that is especially true now in a global public health emergency.
“We look forward to working with scientists at PeptiDream to identify candidates targeting SARS-CoV-2 and other coronaviruses.”
Last month, Merck signed three separate Covid-19-focused agreements with Themis, IAVI and Ridgeback Biotherapeutics. These deals are for the development of potential Covid-19 therapies and a vaccine candidate
BRI SuperCompute Refresher
Found it ... backstory on the quantum crunch that went into designing / optimizing BRI (pmx-30063)
Company also has an article on
http://www.ipharminc.com/s/new_weapons_for_the_germ_wars.pdf
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To solve this problem, Klein's team carried out a series of demanding quantum computations, an approach called density functional theory, to systematically derive accurate readings of the rotational resistance of the arylamide backbone. With about 60,000 hours of computing time using 128 LeMieux processors, they derived the force fields they needed.
SCALABILITY/TECHNICAL COMPUTING (2003)
Pittsburgh Supercomputing Center
Pittsburgh, PA
United States
Year: 2003
Status: Finalist
Category: Science
Nominating Company: Hewlett-Packard Company
Summary: Massive computing power accelerates the search for inexpensive polymers that would function the same way as simple but difficult-to-manufacture peptides that are known to be powerful anti-bacterials and that can reduce the incidence of in hospital infection.
http://www.cwhonors.org/Search/his_4a_detail.asp?id=4849
Excerpt
Prior to LeMieux becoming available (early 2002), there was no similarly powerful system available to researchers in the United States outside of a few installations at classified government laboratory facilities. LeMieux thus filled a large gap in United States research capability -- highlighted in a 1999 report to President Clinton (The President’s Information Technology Advisory Committee report). When installed, LeMieux’s 3,000 parallel processors, capable of six teraflops peak performance (six trillion calculations a second), provided more than five times more computing capability than the next most powerful system available to researchers through the National Science Foundation. It has facilitated, and will continue to facilitate, progress in many areas of significant social impact, such as the structure and dynamics of proteins useful in drug design, storm-scale weather forecasting, earthquake modeling, and modeling of global climate change.
thx notice you too look to keep folks honest, well, at least call out the falsehoods
thx = will read up on the lit -- would be v interested to see BRI developed (is a longer path for sure) to get directly to the lung in addition to IV .... systemic delivery has biggest bang for buck, esp for those sick/sickest, as viruses go everywhere eventually from what i've read - but a nebulized formulation though would open BRI up to its prophylactic potential (kill/block prior to infection), say, for use by front-line h care workers, or by protesters, rally gatherers, sports fans, etc... take a few puffs of Nebulized BRI to help neutralize SARS COV 2 and other coronaviruses and other influenzas and other viruses away... thx also for always summarizing the science - with all the new eyeballs here on IHUB IPIX, we need to lessen the spin, the parse, the fog - i'll backtrack and try to find some of the old summaries i did on the BRI-lliant science behind this wunder small molecule designed by a true Brain Trust of scientists who were way way way ahead of everyone else -- what an appropriate exclamation point (!) to story if indeed BRI gets to really show off what it was designed to do ---- the next and better Humira ive always felt
More COVID Tx and Vax the better for all of us...
Re EIDD-2801 — my .10c
Its advantage right now is that it has been tested more preclinically (more viruses, mice) and is oral —
But maybe Bri could similarly be tested as tablet ... ipix has done safety dosing for UC program and one thing we know about BRI is that it was designed to be tuff (unlike Peptides that degrade), and as a result can be variously formulated... to date: IV, enema retention, oral rinse, tablet — plus SARS COV 2 showing up in Gut where ACE2 highly expressed - in the lit, studies showing Defensins can block entry at the receptor site and researchers attributing why some folks show GI distress (and others not) is because they have deficient AMP/HDP expression... enter BRI - offset said deficiencies
Other impt things to keep in mind re EIDD-2801 ... some Qs re safety and its MOA is similar to Remdesivir, which has underwhelmed in humans [the (not so) great Fauci is so lowering the bar] only acting to interfere w intracellular replication — whereas BRI has potential to neutralize virus on contact and prevent binding (prior to infection) *and* also interfere w replication once virus inside cell (post infection), ie, 3 potential MOAs... kill it, block it, inhibit it — and oh yeah, suppress the cytokine storm and attach those bad bacteria that co present while at it (EIDD-2801 does neither of the latter)
That is why folks need to start realizing how BRI is so very difft as an antiviral ... the multiple redundancies built in to fight off foreign pathogens — thus less likely for resistance to develop due to mutation — plus the anti-inflammatory and anti-bacterial to boot — all the academics know this, now industry and gov need to play catch up and sooner the better
Anyway, all good that multiple efforts underway - it’s just how can any drug really compare with one that essentially mimics what Ma Nature Father Time has perfected over ages/eons/millennia ... redundancy after redundancy after redundancy all to strengthen the innate and adaptive host defense response
No drug is there yet, as to THE go to COVID 19 Tx, maybe one never will be (combos) but I’m placing my bet with BRI that it just might play an outsized role - making us all a lot less grumpy and frightful about the current viral world we’re living in
Sars cov 2 is likely only the first of more bad viruses to come
Type O vs Type A blood
So much still to learn, so much uncertainty... re COVID-19
I’m type O but I’d still want some BRI dosing thru my veins, shredding virions on contact, if I was hospitalized w COVID-19
Worldwide
O blood type 45%
A blood type 40%
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In fact, the findings suggest that people with blood type A face a 50 percent greater risk of needing oxygen support or a ventilator should they become infected with the novel coronavirus. In contrast, people with blood type O appear to have about a 50 percent reduced risk of severe COVID-19.
https://directorsblog.nih.gov/2020/06/18/genes-blood-type-tied-to-covid-19-risk-of-severe-disease/
Re BARDA... BS
Good story on how BARDA plays faves among the well-connected... nice to see R Bright whistleblow
https://www.google.com/amp/s/www.washingtonpost.com/business/2020/06/11/coronavirus-drug-ridgeback-biotherapeutics/
On Ridgeback Bio — have an Oral antiviral (rare) and inked a deal w Merck (undisclosed terms but bet Big Bucks) after publication ... reinforces how much peer review papers matter - having read up, shown the data, Big Rx more likely to pay up
Assume if stellar BRI results continue, IPIX will become an even larger Blip on Radars - to point BARDA will have to toss some $ IPIX’s way... vaccines the dream solution, but truly an Escher-like stair step to get there
Would love to see BRI IV for sickest hospitalized patients, leveraging immunomodulatory/anti-inflammatory/antibacterial properties, with work on nebulizer formulation to use prophylactically based on BRI apparent, and highly unique ability to shred envelope on contact and also block entry