Ethanol induced alterations in low and high density lipoproteins

Area of Science:

• Biochemistry
• Metabolic Science
• Primate Research

Background:

• Previous studies indicated high alcohol consumption enhances lipoprotein cholesterol synthesis.
• Understanding alcohol's impact on lipoprotein clearance and transfer processes in vivo is crucial.

Purpose of the Study:

• To investigate whether ethanol (ETOH) modifies plasma low-density lipoprotein (LDL) levels.
• To assess ETOH's effects on lipoprotein clearance and plasma transfer processes in vivo.

Main Methods:

• Male squirrel monkeys were divided into control, low ETOH (12% calories), and high ETOH (24% calories) groups.
• Dietary intake involved isocaloric substitution of vodka for carbohydrates.
• Radio-labeled LDL cholesteryl ester (CE) and HDL CE clearance and transfer were measured in vivo.

Main Results:

• High ETOH intake significantly increased LDL lipid and protein levels.
• Impaired transfer of LDL CE to HDL was observed in the high ETOH group.
• Ethanol consumption at both doses delayed the clearance of HDL CE from circulation.

Conclusions:

• Ethanol influences lipoprotein levels in primates by altering lipid transfer processes (LDL) and clearance (HDL).
• Moderately high ethanol doses (24% of calories) impact lipoprotein metabolism without adverse liver effects.
• Findings suggest mechanisms for altered circulating lipoprotein pools due to alcohol consumption.