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  • Title: In vitro transformation of chenodeoxycholic acid and ursodeoxycholic acid by human intestinal flora, with particular reference to the mutual conversion between the two bile acids.
    Author: Hirano S, Masuda N, Oda H.
    Journal: J Lipid Res; 1981 Jul; 22(5):735-43. PubMed ID: 7288282.
    Abstract:
    Nine fecal samples from four healthy subjects were examined for their ability to transform chenodeoxy-cholic acid (CDCA) and ursodeoxycholic acid (UDCA) in in vitro anaerobic broth cultures. Seven samples converted CDCA and UDCA into each other (more than 50% of CDCA was converted into UDCA while 10% or less of UDCA was converted into CDCA), and produced 7-keto-lithocholic acid and lithocholic acid equally from both acids. No alteration of the 7 beta-hydroxy group of UDCA was demonstrated by two fecal samples that failed to perform mutual 7-epimerization, suggesting the conversion of UDCA into lithocholic acid via CDCA. The 3 alpha-hydroxy groups of these substrate and metabolite bile acids were invariably partially epimerized to 3 beta-hydroxy groups by all the fecal samples. Evidence is presented for the prevalence of these 7- and 3-epimerizing organisms among the human intestinal flora.
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