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Tuesday, November 26, 2013 6:32:32 AM
Metabolic Actions of Omega-3 Fatty Acids on Inflammation and Adipocyte Lipolysis in the Metabolic Syndrome
Epidemiological studies identify metabolic syndrome (MetS) as a biomarker of cardiovascular disease (CVD) risk, and recent AHA scientific statements recommend intensive lifestyle diet and exercise measures to reduce risk. Marine-derived omega-3 polyunsaturated fatty acids such as, eicosapentanoic acid (EPA) improve many constituents of the metabolic syndrome such as lowering fasting TG and glucose levels, inflammation, insulin resistance and blood pressure. These improvements may be mediated by increased fat cell storage and metabolism and lipids, reducing inflammation and ectopic fat deposition in visceral abdominal tissue, muscle and liver that results in excessive pro-inflammatory intra-abdominal fat (IAF), insulin resistance and reduced levels of HDL cholesterol, hallmark characteristics of the MetS. The anti-inflammatory actions of EPA lower acute phase reactants (APRs) and proinflammatory mediators are mechanisms for their lipid lowering and insulin sensitizing effects to reduce CVD risk. The systematic investigation of marine-derived omega-3 PUFAs on these inflammatory, metabolic and physiological parameters will provide new mechanistic insights for the therapeutic use of a potentially beneficial, safe nutraceutical, EPA in patients with MetS. Thus, it is our hypothesis that supplementation of marine-derived omega-3 PUFAs, will reduce constituents of MetS as well as systemic and tissue inflammation, insulin resistance (HOMA-IR), adipocyte lipolysis and cytokine release from AT to enhance TG storage capacity of subcutaneous AT. The reduction in inflammation and increase in insulin sensitivity will remodel adipose tissue to function more efficiently in TG uptake and storage; thus, reducing circulating FFAs and cytokines. We postulate that these metabolic effects may decrease ectopic fat deposition in viscera (IAF and muscle), an intriguing, novel outcome that provides rationale for the 9 month treatment.
The Specific Aims are to conduct a pilot 9 month randomized trial in adults with high Tg and at least one other component of the MetS to compare the effects of EPA vs. placebo on:
Aim 1: Metabolic (e.g., lipoproteins, inflammatory cytokines, acute phase reactants, glucose tolerance/insulin resistance) and adipose tissue responses (basal and insulin suppression of lipolysis (ED50), LPL activity, cytokine release and lipogenesis).
Aim 2: Regional fat distribution quantified anthropometrically as waist and hip circumference, visceral and subcutaneous adipose volumes and muscle lipid accumulation by CT-scan and body composition (total and regional fat mass) by dual energy absorptiometry (DXA).
These outcomes have potentially intriguing therapeutic implications for marine derived omega-3 PUFA supplementation as part of a lifestyle program for patients at increased cardiometabolic risk.
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