Stimulation of Acyl-CoA: Cholesterol Acyltransferase Activity by Hyperlipemic Serum Lipoproteins

Abstract
Cholesteryl ester synthesis by the microsomal fraction from rat hepatoma cells was stimulated by preincubation of the microsomal fraction with lipoproteins obtained from hyperlipemic rabbit sera. Lipoproteins from normolipemic sera had no stimulatory effect. Growth of cells in hyperlipemic rabbit sera also increased microsomal cholesteryl ester synthesis. Increased cholesteryl ester synthesis was accompanied by an increased microsomal-free cholesterol content.