Abstract
Choleresis induced by bucolome (BC) (1-cyclohexyl-5-n-butyl-2,4,6-trioxoperhydropyrimidine) was studied in male Wistar rats. [14C]Erythritol and mannitol clearance studies indicated this choleresis to be of canalicular origin. In 1-h continuous bile collection studies, immediately after the interruption of enterohepatic circulation (acute interruption), both bile flow and bile salt excretion rates were significantly increased in rats administered BC. However, the bile salt excretion rate fell rather rapidly in BC-administered rats, while the bile flow rate was fairly constant during this 1-h period. Thus, unlike the situation in control rats, bile flow rate was not significantly correlated with the bile salt excretion rate in BC-administered rats. In rats that had an external bile fistula open for 16-20 h (chronic interruption of enterohepatic circulation) the bile flow rate was also significantly increased by BC administration, while the bile salt excretion rate was not changed after BC administration. It is suggested that BC induced bile-salt-independent choleresis in both experimental rat groups (acute and chronic interruption of enterohepatic circulation). In addition, BC appeared to increase the bile-salt-dependent fraction of bile in rats with acute interruption of enterohepatic circulation, possibly by mobilizing the bile salt pooled in the intestinal content and (or) intestinal wall.
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