Effect of alcohol on total urinary hydroxyproline excretion

Area of Science:

• Biochemistry
• Hepatology
• Metabolic Research

Background:

• Chronic alcohol consumption is a leading cause of liver disease, including alcoholic cirrhosis.
• Collagen metabolism plays a crucial role in liver fibrosis and cirrhosis development.
• Hydroxyproline, a marker of collagen degradation, can be assessed via urinary excretion.

Purpose of the Study:

• To investigate urinary hydroxyproline excretion in patients with high alcohol intake.
• To determine the relationship between alcohol consumption, liver biopsy findings, and collagen metabolism.
• To explore the potential effect of alcohol withdrawal on hydroxyproline levels and collagen degradation.

Main Methods:

• Urinary hydroxyproline levels were measured in 33 patients consuming over 80 gm of alcohol daily.
• Patients were categorized based on liver biopsy results: cirrhosis, normal, fatty change, or hepatofibrosis.
• Hydroxyproline excretion was re-evaluated in 16 patients during alcohol consumption and after withdrawal.

Main Results:

• Patients with alcoholic cirrhosis showed significantly higher urinary hydroxyproline excretion compared to other groups.
• Following alcohol withdrawal, hydroxyproline excretion rates significantly decreased.
• A notable increase in hydroxyproline excretion was observed after alcohol cessation.

Conclusions:

• Elevated urinary hydroxyproline in heavy drinkers may indicate increased collagen turnover or impaired degradation.
• Alcohol withdrawal leads to a reduction in hydroxyproline excretion, suggesting a direct inhibitory effect of alcohol on collagen degradation.
• Alcohol's influence on collagen metabolism warrants further investigation for its role in the pathogenesis of alcoholic cirrhosis.