Relationship between plasma lipid concentrations and HDL subclasses.

Area of Science:

• Cardiovascular research
• Lipid metabolism
• Atherosclerosis research

Background:

• High-density lipoprotein (HDL) subclasses have distinct metabolic roles.
• HDL influences atherogenesis, and its subclass distribution may correlate with atherosclerosis incidence.

Purpose of the Study:

• To investigate the relationship between plasma lipid levels and HDL subclasses in Chinese adults.
• To determine how triglyceride (TG), total cholesterol (TC), HDL-cholesterol (HDL-C), and LDL-cholesterol (LDL-C) concentrations affect HDL subclass distribution and apo-AI content.

Main Methods:

• Analyzed apo-AI content in HDL subclasses using 2D gel electrophoresis and immunodetection.
• Classified 442 Chinese adults based on NCEP (ATP III) guidelines for TG, TC, HDL-C, and LDL-C levels.

Main Results:

• High TG subjects showed higher prebeta(1)-HDL and lower HDL(2b) compared to normal TG subjects.
• Increased TC and LDL-C, and decreased HDL-C were associated with shifts in HDL subclasses, favoring smaller particles like prebeta(1)-HDL and reducing larger ones like HDL(2b).
• Multivariate analysis confirmed TG and TC positively correlate with prebeta(1)-HDL, while HDL-C inversely correlates; TG and TC negatively correlate with HDL(2b), while HDL-C and apo-AI positively correlate.

Conclusions:

• Elevated plasma TG, TC, LDL-C, or decreased HDL-C concentrations lead to a shift towards smaller HDL subclasses.
• This shift suggests potentially weakened reverse cholesterol transport and abnormal HDL maturation.
• Plasma TG concentration significantly impacts HDL subclass distribution more than TC concentration.