Abstract
Selected aspects of bile acid metabolism were assessed in six women with primary biliary cirrhosis and varying degrees of cholestasis. Urinary bile acid excretion was markedly increased and correlated highly with serum levels. In three patients in whom urinary bile acids were separated by chromatography, the majority of urinary bile acids were monosulfated (34%, 42%, 32%) or polysulfated and/or glucuronidated (30%, 20%, 38%). The monosulfates of chenodeoxycholic acid were conjugated at either the 3 position (67%, 68%, 73%) or the 7 position (33%, 32%, 27%); similarly, the monosulfates of cholic acid were conjugated at the 3 position (65%, 58%, 68%) or the 7 position (35%, 42%, 32%). The position of sulfation was not markedly influenced by the mode of amidation with glycine or taurine. Chenodeoxycholic exchangeable pool size, turnover rate, and synthesis were measured by isotope dilution and found to be well within normal limits, despite the cholestasis. The fraction of chenodeoxycholic acid synthesis excreted in urine ranged from 9 to 48%; 4–38% of chenodeoxycholic acid synthesis was sulfated. These data indicate that the major abnormalities in bile acid metabolism in patients with cholestasis secondary to primary biliary cirrhosis are formation of sulfated bile acids in greatly increased amounts, elevation of blood levels of primary bile acids, and a shift to renal excretion as a major mechanism for bile acid elimination. Chenodeoxycholic acid synthesis continues at its usual rate despite cholestasis. Whether these changes, including the formation of 7-monosulfated bile acids, occur in other forms of cholestasis and whether either the persistance of unchanged chenodeoxycholic acid synthesis or the formation of such novel conjugates has any pathophysiological significance remain to be investigated.
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Supported by NIH grant AM 21506 to the University of California and grant RR 00585 and NIH grants AM 19448 and AM 16770 to the Mayo Clinic and Mayo Foundation. In addition, research at the University of California was supported by grants-in-aid from the Rorer Company, the Eli Lilly Company, and the Canada Packers Limited Company.
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Raedsch, R., Lauterburg, B.H. & Hofmann, A.F. Altered bile acid metabolism in primary biliary cirrhosis. Digest Dis Sci 26, 394–401 (1981). https://doi.org/10.1007/BF01313580
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DOI: https://doi.org/10.1007/BF01313580