Arteriosclerosis and Thrombosis, Vol 14, 1056-1065, Copyright © 1994 by American Heart Association

ARTICLES

A cell culture system for screening human serum for ability to promote cellular cholesterol efflux. Relations between serum components and efflux, esterification, and transfer

M de la Llera Moya, V Atger, JL Paul, N Fournier, N Moatti, P Giral, KE Friday and G Rothblat
Department of Biochemistry, Medical College of Pennsylvania, Philadelphia 19129.

A cell culture system was employed to test a large number of samples of human serum for the ability to stimulate the efflux of cell cholesterol. The extent of efflux obtained with each specimen was correlated with the serum concentrations of cholesterol, triglycerides, apoprotein (apo) B, apo A-I, apo A-II, and lipoprotein subfractions (ie, high-density lipoprotein2 [HDL2], HDL3, lipoprotein [Lp] A-I, and LpA-I:A-II). In addition, the subsequent esterification of the released cholesterol and the distribution of the synthesized exogenous cholesteryl esters between HDL and low-density lipoprotein/very-low- density lipoprotein provided estimates of the lecithin:cholesterol acyltransferase (LCAT) and cholesteryl ester transfer protein (CETP) activities of each serum. The values for these activities were analyzed for correlations with cell efflux and the various serum parameters. Cell cholesterol efflux best correlated with serum total HDL cholesterol values. HDL2 and HDL3 correlated about equally well with efflux, whereas LpA-I demonstrated a much greater association with efflux than did LpA-I:A-II. Analysis of the data by partial correlation analysis indicated that HDL3 and LpA-I were the HDL subfractions most closely associated with efflux. Esterification of the released radiolabeled cholesterol was strongly and positively correlated with serum triglyceride concentrations and negatively related to the serum concentrations of HDL2. There was no relation between esterification values, which reflect LCAT activity, and efflux. The transfer of the labeled cholesteryl esters between HDL and apoB-containing lipoproteins was used as a measure of CETP activity and demonstrated a pattern in which all apoB-related parameters were positively correlated to transfer of esterified cholesterol, and all HDL associated parameters, particularly HDL3, were negatively related to transfer. No relations were observed between efflux, esterification, and transfer.

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