Preferential cholesteryl ester acceptors among triglyceride-rich lipoproteins during alimentary lipemia in normolipidemic subjects

Arteriosclerosis, Thrombosis, and Vascular Biology
T S LasselB Guy-Grand

Abstract

Triglyceride-rich lipoproteins (TRLs), namely chylomicrons (CMs), VLDL, and their remnants, are implicated in the atherogenic features of postprandial lipemia. In human plasma, cholesteryl ester transfer protein (CETP) mediates the heteroexchange of neutral lipids, ie, triglycerides (TG) and cholesteryl esters (CE), between distinct subpopulations of apoB- and of apoAI-containing lipoproteins. In fasting normolipidemic plasma, CETP plays an antiatherogenic role by promoting preferential CE redistribution from HDL to LDL particles of intermediate subclass with optimal binding affinity for the cellular LDL receptor. While the relative proportions and chemical compositions of donor and acceptor lipoproteins are known to influence CETP activity, elevated levels of TRL present during alimentary lipemia have been proposed to be associated with enhanced CETP activity. To identify the preferential CE acceptor particles among postprandial TRL subfractions, we investigated the effects of a typical Western meal (1200 kcal, 14% protein; 38% carbohydrate; and 48% fat, monounsaturated/polyunsaturated ratio 4:1) on the rates of postprandial CE transfer from HDL to apoB-containing lipoproteins in normolipidemic subjects (n=13). Two hours postp...Continue Reading

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