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- W1566885967 abstract "The effect of individual bile acids on bile acid synthesis was studied in primary hepatocyte cultures. Relative rates of bile acid synthesis were measured as the conversion of lipoprotein [4-14C]cholesterol into 4-14C-labeled bile acids. Additions to the culture media of cholate, taurocholate, glycocholate, chenodeoxycholate, taurochenodeoxycholate, glycochenodeoxycholate, deoxycholate, and taurodeoxycholate (10-200 microM) did not inhibit bile acid synthesis. The addition of cholate (100 microM) to the medium raised the intracellular level of cholate 10-fold, documenting effective uptake of added bile acid by cultured hepatocytes. The addition of 200 microM taurocholate to cultured hepatocytes prelabeled with [4-14C]cholesterol did not result in inhibition of bile acid synthesis. Taurocholate (10-200 microM) also failed to inhibit bile acid synthesis in suspensions of freshly isolated hepatocytes after 2, 4, and 6 h of incubation. Surprisingly, the addition of taurocholate and taurochenodeoxycholate (10-200 microM) stimulated taurocholate synthesis from [2-14C]mevalonate-labeled cholesterol (p less than 0.05). Neither taurocholate nor taurochenodeoxycholate directly inhibited cholesterol 7 alpha-hydroxylase activity in the microsomes prepared from cholestyramine-fed rats. By contrast, 7-ketocholesterol and 20 alpha-hydroxycholesterol strongly inhibited cholesterol 7 alpha-hydroxylase activity at low concentrations (10 microM). In conclusion, these data strongly suggest that bile acids, at the level of the hepatocyte, do not directly inhibit bile acid synthesis from exogenous or endogenous cholesterol even at concentrations 3-6-fold higher than those found in rat portal blood." @default.
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- W1566885967 title "Absence of negative feedback control of bile acid biosynthesis in cultured rat hepatocytes." @default.
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- W1566885967 doi "https://doi.org/10.1016/s0021-9258(17)38743-4" @default.
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