[Measurement of microsomal function in hepatectomized rat].

Area of Science:

• Pharmacology
• Hepatology
• Biochemistry

Context:

• Liver microsomal function is crucial for drug metabolism and detoxification.
• Cytochrome P-450 enzymes are key players in liver metabolism.
• Assessing liver function is vital in clinical settings, especially before liver surgery.

Purpose:

• To evaluate Trimethadione (TMO) as a marker for assessing liver microsomal function.
• To validate the TMO tolerance test in rat models of liver injury (CCl4 intoxication) and partial hepatectomy.
• To correlate in vivo TMO metabolism with in vitro measures of liver enzyme activity.

Summary:

• Trimethadione (TMO) is metabolized to dimethadione (DMO) by cytochrome P-450 enzymes.
• A TMO tolerance test was conducted on rats with CCl4-induced liver injury and after 68% partial hepatectomy.
• Serum DMO/TMO ratios after TMO administration correlated with hepatic cytochrome P-450 content and TMO N-demethylase activity, indicating liver function.

Impact:

• The TMO tolerance test provides a quantitative measure of liver functional capacity.
• This test can aid in determining the suitability of patients for hepatectomy.
• The findings support the TMO tolerance test as a valuable tool in surgical decision-making for liver resections.