Menopausal estrogen use, high density lipoprotein cholesterol subfractions and liver function.

Area of Science:

• Endocrinology
• Cardiovascular Health
• Lipid Metabolism

Background:

• Menopause is associated with changes in lipid profiles.
• Hormone replacement therapy, including estrogen, is used to manage menopausal symptoms.
• The impact of exogenous estrogen on high-density lipoprotein (HDL) cholesterol requires further elucidation.

Purpose of the Study:

• To investigate the effect of exogenous estrogen on HDL cholesterol levels in postmenopausal women.
• To determine if estrogen therapy influences specific HDL subfractions (HDL2 and HDL3).
• To explore the relationship between estrogen dosage and HDL cholesterol levels.

Main Methods:

• Comparison of lipid profiles between menopausal women on exogenous estrogen and those not on estrogen.
• Analysis of total HDL, HDL2, and HDL3 cholesterol concentrations.
• Adjustment for confounding factors including body composition, alcohol intake, smoking, and physical activity.
• Assessment of liver function using SGOT and SGPT enzyme levels.

Main Results:

• Estrogen users exhibited significantly higher total HDL and HDL2 cholesterol compared to non-users.
• HDL3 cholesterol levels were similar between the groups.
• A dose-response relationship was observed between estrogen dose and HDL-total/HDL2 cholesterol.
• Estrogen users showed lower concentrations of liver enzymes (SGOT, SGPT).

Conclusions:

• Menopausal estrogen therapy significantly elevates total HDL cholesterol, primarily due to an increase in HDL2.
• The observed increase in HDL cholesterol is not attributable to altered hepatic microsomal activity, as indicated by lower liver enzyme levels in estrogen users.
• Estrogen therapy demonstrates a beneficial effect on HDL cholesterol profiles in postmenopausal women.