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The regulation of bile acid synthesis was studied in rabbits after interruption of the enterohepatic circulation by choledochoureteral anastomosis. Total daily bile acid output was 772 +/- 130 (SD) mumol/24 h, of which greater than 95% was glycocholic acid. Administration of deoxycholic or cholic acid or their conjugates (300-800 mumol) or gall-bladder bile failed to down-regulate endogenous bile acid synthesis. In contrast, chenodeoxycholic acid administration did down-regulate bile acid synthesis, but this effect was related to the formation and excretion of lithocholic acid. This observation was confirmed by the finding that i.v. infusion of 10-20 mumol of either lithocholic acid or 3 beta-hydroxy-5-cholenoic acid significantly reduced cholic acid synthesis. Thus monohydroxy bile acids, derived from either hepatic or intestinal sources, participate in the down-regulation of bile acid synthesis.
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