"Liao's own research has proved that statins have other biochemical effects than lowering cholesterol. Most important, they reduce the amount of an enzyme called Rho-kinase. That, in turn, dials back damaging inflammation in arteries. When Liao knocks down the level of Rho-kinase in rats, they don't get heart disease. And in new, still unpublished work, he has showed that simply reducing Rho-kinase in certain immune system cells is enough to reduce heart disease in rats."
Don't know if this is the same mechanism, or if there are other anti-inflammatory mechanisms at work as well with statins, but this may be the reason that there have been results pointing to modest protective effects of statins for Alzheimer's Disease.
regards
aj