Changes in microsomal activity in alcoholism and obesity

Area of Science:

• Hepatology
• Pharmacology
• Metabolic Research

Background:

• Obesity and alcoholism are significant risk factors for liver damage.
• Cytochrome P-4502E1 (CYP2E1) induction plays a crucial role in the pathogenesis of alcoholic liver disease.
• Understanding the interplay between body composition, alcohol use, and liver function is critical.

Purpose of the Study:

• To evaluate microsomal function in alcoholic and nonalcoholic males with varying body compositions.
• To assess chlorzoxazone (CLZ) pharmacokinetics as a marker of CYP2E1 activity.
• To investigate the relationship between CLZ metabolism, urinary 8-hydroxydiguanosine levels, and liver histology.

Main Methods:

• Conducted pharmacokinetic studies of chlorzoxazone (CLZ) in 17 alcoholics and 21 nonalcoholic subjects.
• Subjects were categorized by weight (normal and obese) and alcohol consumption status.
• Measured CLZ serum concentrations, 6-hydroxy-chlorzoxazone (6-OH-CLZ) metabolite, anthropometrics, and urinary 8-hydroxydiguanosine; liver biopsies were performed on alcoholics.

Main Results:

• Chlorzoxazone (CLZ) area under the curve (AUC) was significantly higher in normal-weight controls.
• CLZ AUC correlated negatively with adiposity in nonalcoholic subjects.
• Both alcoholism and obesity were identified as independent predictors of CLZ AUC, with an additive effect observed with centripetal body fat distribution.

Conclusions:

• Centripetal adiposity and alcoholism are independently associated with CYP2E1 induction.
• These factors may contribute to the increased prevalence of liver damage in obese alcoholics.
• The findings suggest a potential mechanism for nonalcoholic steatohepatitis development.