Lecithin:cholesterol acyltransferase activity in rats treated with 4-amino-pyrazolo-pyrimidine.

Lecithin:cholesterol acyltransferase(LCAT) in rats treated with 4-amino-pyrazolo-pyrimidine (4-APP) has been studied. Treatment with 4-APP decreased the plasma concentration of triglycerides, cholesterol and cholesteryl ester concomitantly with a decreased rate of cholesterol esterification in plasma. The reduced cholesterol esterification was due both to an effect on the enzyme and on the lipoprotein substrate. Plasma prothrombin decreased to the same extent as that of LCAT, indicating that the primary effect of 4-APP is upon protein synthesis and secretion from the liver.