[Decrease in the level of free cholesterol fraction HDL as a risk factor for threatened atherosclerosis in idiopathic...

Area of Science:

• Metabolic Health
• Lipid Metabolism
• Endocrinology

Background:

• High-density lipoprotein (HDL) plays a crucial role in cholesterol transport.
• Insulin resistance and altered HDL metabolism are implicated in metabolic disorders.
• Understanding the relationship between HDL components and insulin response is vital for metabolic health assessment.

Purpose of the Study:

• To investigate the association between plasma high-density lipoprotein (HDL) components and endogenous insulin response.
• To explore correlations between insulin secretion during an oral glucose tolerance test (OGTT) and HDL lipid and apolipoprotein concentrations.

Main Methods:

• Analysis of plasma HDL components (free cholesterol, esterified cholesterol, apolipoprotein A1) in 89 healthy, normolipidaemic, non-obese, non-diabetic male subjects.
• Correlation analysis between insulin levels measured during an OGTT and HDL composition.
• Comparison of HDL composition between subgroups with high and low insulin response.

Main Results:

• An inverse association was observed between plasma HDL components and endogenous insulin response.
• Lower ratios of free cholesterol to esterified cholesterol and protein (apoA1) in HDL were found in individuals with higher insulin secretion.
• Subjects with high insulin response exhibited lower concentrations of free and esterified cholesterol and protein in HDL compared to those with low insulin response.

Conclusions:

• Low concentration of free cholesterol is a significant alteration in HDL composition in hyperinsulinemic, healthy men.
• These findings suggest a potential link between HDL composition and insulin secretion dynamics in healthy individuals.
• Further research may elucidate the clinical implications of these metabolic interrelationships.