RESUMO
The effect of Picroliv on hepatic microsomal mixed-function oxidases (MFO) and glutathione conjugating enzyme system in cholestatic rats was studied. Bile duct ligation in male rats for one weeks caused significant increase in both serum sorbitol dehydrogenase activity and serum bile acide concentration indicating cholestatic liver injury. Furthermore, a rise in the hepatic hydroxyproline level indicating collagen accumulation was observed. As a result of these alterations, the hepatic microsomal MFO system was imparied as evidenced by a decrease in cytochrome P-450 system content and in the activities of NADPH-cytochrome C reductase and aminopyrine demethylase. While the hepatic glutathione content remained unaffected, the cytosolic glutathione S-transferase activity was clearly suppressed due to subchronic cholestasis. Oral administration of Picroliv (25 mg/kg/day for 21 days)--a standardized irioid glycoside fraction of Picrorhiza kurroa in bile ligation induced cholestatic rats, singnificantly prevented the biochemical changes induced in liver and serum of cholestatic rats. These results suggested that picroliv has anti-cholestatic activity which may be attributed to antioxidant property or it's specific role in protein synthesis.