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Journal of Lipid Research, Vol 24, 604-613, Copyright © 1983 by Lipid Research, Inc.

ARTICLES

Intestinal absorption, excretion, and biotransformation of hyodeoxycholic acid in man

E Sacquet, M Parquet, M Riottot, A Raizman, P Jarrige, C Huguet and R Infante

Five patients fitted with a biliary T-tube after cholecystectomy were given orally a tracer dose of [14C]hyodeoxycholic acid and 500 mg of the same unlabeled acid. Intestinal absorption and biotransformation, liver metabolism, bile secretion, fecal and urinary excretions of this acid or of its metabolites were studied. Hyodeoxycholic acid was well absorbed by the human intestine. It was not subjected to intestinal transformations and, particularly, did not produce a significant amount of lithocholic acid, which does not support the existence of intestinal bacterial 6 alpha-dehydroxylases. The percentage of hyodeoxycholic acid and of its metabolites recovered in bile varied from 11.5 to 31%. Two major metabolites were isolated from bile: glycohyodeoxycholic acid and hyodeoxycholic acid glucuronide. Analysis of urinary bile acids showed that a large proportion (30-84%) of the administered hyodeoxycholic acid was excreted by the kidney as a glucuronide. The large extent of both glucuronidation and urinary excretion of hyodeoxycholic acid is a unique example of bile acid metabolism and excretion in man.
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