Sequence of alcohol-induced initial changes in plasma lipoproteins (VLDL and HDL) and lipolytic enzymes in humans.

The sequence of alterations in the concentration and composition of different plasma lipoproteins following alcohol intake is not known. We therefore monitored the concentrations of cholesterol, triglycerides, phospholipids, and proteins in the major lipoprotein fractions (VLDL, LDL, HDL2, and HDL3) in ten nonalcoholic healthy male volunteers who were given 5.5 g of alcohol per kilogram of body weight during 21/2 days (a weekend). In addition, lipoprotein lipase activity was measured in post-heparin plasma and in adipose tissue and hepatic lipase activity was measured in post-heparin plasma before and after the experiment. in a separate control experiment, the same subjects received meals and liquids without alcohol. Blood alcohol levels remained below 1.5 g/L. Alcohol caused a progressive increase in the fasting VLDL triglyceride and phospholipid concentrations, both of which were doubled during the experiment (P less than 0.001). In contrast, the VLDL cholesterol levels remained unchanged until the third morning, when there was a slight increase. The LDL triglyceride and phospholipid concentrations also rose without simultaneous changes in the LDL cholesterol concentration. Consistent with these changes, the HDL cholesterol concentration showed no response to alcohol during the experiment, but the HDL phospholipid level rose from 76 to 99 mg/dL (P less than 0.001). This was reflected as an increase in the HDL2 concentration from 124 to 158 mg/dL (P less than 0.01), whereas no change occurred in the HDL3 level. The increment of HDL2 concentration was due to a rise of its triglycerides, phospholipids, and apoproteins A-I and A-II but not to a rise of cholesterol.(ABSTRACT TRUNCATED AT 250 WORDS)