Abstract
High concentrations of bile acids have been reported as injurious to hepatocytes. We report the influence of various combinations of bile acids on the liver-specific function of cultured rat hepatocytes. Using 4 bile acids (glycocholate [GC], taurocholate [TC], glycohenodeoxycholate [GCDC], and taurochenodeoxycholate [TCDC]), we obtained 6 bile-acid mixtures, each containing equal amounts of 2 bile acids (total bile acids [TBA], 2 mM). Changes in gluconeogenesis, ureagenesis, DNA contents, medium alanine aminotransferase, and morphologies were compared among the paired bile acid compositions by measuring the C/CDC ratio ([GC + TC]/[GCDC + TCDC]) of each. In terms of their relative impairments of ureagenesis from greatest to least, the acids were GCDC, TCDC, and GC, which was almost the same as TC. When the C/CDC ratio was 0, the values of all parameters measured deteriorated. When the C/CDC ratio was 1 in the presence of 1 mM GCDC, only the rate of ureagenesis was diminished. When the C/CDC ratio was infinite, no hepatocellular injury was observed. GCDC and TCDC, together or separately, showed significant hepatocellular injury when the TBA concentration was 2 mM.
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