PCSK9 peptide

Cholesterol treatment guidelines have evolved in the United States from the 1988 Adult Treatment Panel (ATP) I, the ATP II guidelines, ATP III guidelines, the 2013 American College of Cardiology/American Heart Association guidelines, to the most recent 2016 recommendations from the United States Protective Services Task Force. The use of statins to treat hyperlipidemia has been widely accepted and recommended in adults aged 40-75 years old with at least one risk factor and a calculated 10-year cardiovascular disease risk of 10%. However, statin use is associated with myalgias, myopathy, musculoskeletal injury, liver injury, and increased diabetes risk. The evidence for non-statin treatments is mixed. Bile acid sequestrants and ezetimibe reduce cardiovascular events. There is no evidence that the addition of any fibric acid derivative to a statin improves cardiovascular outcomes. Available evidence suggests that the use of proprotein convertase subtilisin/kexin type 9 (PCSK9) enzyme inhibitors likely leads to little or no difference in mortality despite lowering lipid levels.

Background PCSK9 (proprotein convertase subtilisin/kexin type 9) is well recognized for its important role in cholesterol metabolism. Elevated levels are associated with increased cardiovascular risk and inhibition with PCSK9 antibodies (PCSK9i) lowers cardiovascular events in patients with coronary artery disease. PCSK9 levels are also elevated in people living with HIV (PLWH) and those with dyslipidemia. Because increased PCSK9 in PLWH is associated with impaired coronary endothelial function, a barometer of coronary vascular health, we tested the hypothesis that PCSK9i improves impaired coronary endothelial function in dyslipidemia without coronary artery disease and in PLWH with nearly optimal/above goal low-density lipoprotein cholesterol levels. Methods and Results We performed a single-center study in 19 PLWH and 11 with dyslipidemia to evaluate the effects of the PCSK9i evolocumab on coronary endothelial function using cine 3T MRI to noninvasively measure coronary endothelial function, assessed as the changes in coronary cross-sectional area and coronary blood flow from rest to that during isometric handgrip exercise, a known endothelial-dependent vasodilator. Before evolocumab, there was a decrease or no coronary vasodilation and no increase in coronary blood flow (the normal responses) to isometric handgrip exercise in either group. Following 6 weeks of evolocumab, 480 mg q4 weeks, the % cross-sectional area changes from rest to isometric handgrip exercise were +5.6 +/- 5.5% and +4.5 +/- 3.1% in the PLWH and dyslipidemia groups, respectively, bothPConclusions To our knowledge, these data represent the first evidence that PCSK9 inhibition improves coronary artery health in PLWH and people with dyslipidemia. Registration URL:; Unique identifier: NCT03500302.