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• W1550120108 endingPage "4661" @default.
• W1550120108 startingPage "4654" @default.
• W1550120108 abstract "In isolated rat hepatocytes, fatty acids inhibited the side chain oxidation, but not the uptake, of exogenously added 3 alpha,7 alpha,12 alpha-trihydroxy-5 beta-cholestan-26-oic acid (THCA). THCA did not inhibit fatty acid oxidation. In liver homogenates, fatty acids inhibited THCA activation to its CoA ester (THC-CoA) and THCA oxidation. THCA did not influence fatty acid activation or oxidation. Comparison of the THC-CoA concentrations present in the incubation mixtures during THCA oxidation, with substrate concentration curves determined for THC-CoA oxidation, indicated that the inhibition of THCA oxidation by fatty acids was at least partly exerted at the activation step. The inhibition of THCA activation by fatty acids was noncompetitive. Palmitoyl-CoA at concentrations found in the incubation mixtures during THCA oxidation in the presence of palmitate inhibited THC-CoA oxidation, but not sufficiently to fully explain the fatty acid-induced inhibition of THCA oxidation. The inhibition of THC-CoA oxidation by palmitoyl-CoA did not seem to be competitive. Acyl-CoA oxidase, the first enzyme of peroxisomal beta-oxidation (which catalyzes the side chain oxidation of THCA), was enhanced 15-fold in liver homogenates from clofibrate-treated rats when palmitoyl-CoA was the substrate, but the oxidase activity remained unaltered when THC-CoA was the substrate. In the perfused liver, oleate, infused after a wash-out period of 60 min, markedly inhibited bile acid secretion. The results 1) suggest that fatty acids inhibit THCA metabolism both at the activation step and at the peroxisomal beta-oxidation sequence and that separate enzymes may be involved in both the activation and peroxisomal beta-oxidation of fatty acids and THCA and 2) raise the question whether fatty acids might (indirectly?) affect overall bile acid synthesis via their inhibitory effect on THCA metabolism." @default.
• W1550120108 created "2016-06-24" @default.
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• W1550120108 date "1988-04-01" @default.
• W1550120108 modified "2023-09-30" @default.
• W1550120108 title "Inhibition of 3 alpha,7 alpha,12 alpha-trihydroxy-5 beta-cholestanoic acid oxidation and of bile acid secretion in rat liver by fatty acids." @default.
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• W1550120108 doi "https://doi.org/10.1016/s0021-9258(18)68832-5" @default.
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