[Estrogen receptors in the human liver]

Area of Science:

• Hepatology
• Endocrinology
• Molecular Biology

Background:

• Estrogen receptors (ER) play a role in liver function.
• Chronic liver disease and primary hepatic carcinoma (PHC) can affect hormonal balance.
• Alcohol abuse is a known factor in liver damage.

Purpose of the Study:

• To investigate human hepatic estrogen receptor (ER) levels in healthy individuals and patients with chronic liver disease.
• To characterize estrogen binders in human male liver cytosol.
• To determine the impact of chronic liver disease, PHC, and alcohol abuse on hepatic ER levels.

Main Methods:

• Investigated ER levels in liver cytosol from healthy subjects and patients with chronic liver disease.
• Characterized estrogen binders using binding assays.
• Compared ER levels across different patient groups and disease states.

Main Results:

• Identified two classes of estrogen binders in male liver cytosol, including a high-affinity ER (Kd = 10(-10) M).
• Observed increased hepatic ER levels in males with chronic liver disease and PHC compared to controls.
• Found altered ER levels in females with chronic liver disease, with levels decreasing during disease progression and in PHC.
• Demonstrated a marked increase in ER levels in both male and female patients with prolonged alcohol abuse, particularly in those with acute alcoholic hepatitis.

Conclusions:

• Hepatic ER levels are significantly altered in chronic liver disease, PHC, and in the context of alcohol abuse.
• Alcohol abuse appears to be a strong inducer of hepatic ER levels.
• Sex-based differences in hepatic ER levels are evident and are further modified by liver disease and alcohol consumption.