title: Bile acid synthesis. Metabolism of 3 beta-hydroxy-5-cholenoic acid to chenodeoxycholic acid.
abstract: Metabolism of 3 beta-hydroxy-5-cholenoic acid to chenodeoxycholic acid has been found to occur in rabbits and humans, species that cannot 7 alpha-hydroxylate lithocholic acid. This novel pathway for chenodeoxycholic acid synthesis from 3 beta-hydroxy-5-cholenoic acid led to a reinvestigation of the pathway for chenodeoxycholic acid from 3 beta-hydroxy-5-cholenoic acid in the hamster. Simultaneous infusion of equimolar [1,2-3H]lithocholic acid and 3 beta-hydroxy-5-[14C]cholenoic acid indicated that the 14C enrichment of chenodeoxycholic acid was much greater than that of lithocholic acid. Thus, in all these species, a novel 7 alpha-hydroxylation pathway exists that prevents the deleterious biologic effects of 3 beta-hydroxy-5-cholenoic acid.
mesh_terms: D000818:Animals; D001647:Bile Acids and Salts / Q000096:biosynthesis*; D002635:Chenodeoxycholic Acid / Q000378:metabolism*; D002793:Cholic Acids / Q000378:metabolism*; D002851:Chromatography, High Pressure Liquid; D006224:Cricetinae; D003460:Crystallization; D006801:Humans; D008647:Mesocricetus; D008954:Models, Biological; D011817:Rabbits; D013045:Species Specificity
chemical_list: D001647:Bile Acids and Salts; D002793:Cholic Acids; D002635:Chenodeoxycholic Acid; C014596:3 beta-hydroxy-delta 5-cholenic acid