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• W2095153621 abstract "In liver homogenates from untreated rats the sulphur-substituted fatty acid analogues tetradecylthioacetic acid (CMTTD) was activated to its acyl-coenzyme A thioester. The activation was found to take place in the mitochondrial, microsomal and peroxisomal fractions. The activity of CMTTD-CoA synthetase was 50% compared to palmitoyl-CoA synthetase in all cellular fractions. When rats were treated with the peroxisome proliferating sulphur-substituted fatty acid analogues CMTTD and 3-dithiahexadecanedioic acid (BCMTD), the CMTTD-CoA synthetase activity was induced in mitochondrial, peroxisomal and microsomal fractions. Palmitoyl-CoA synthetase was induced proportionally. In rats treated with tetradecylthiopropionic acid (CETTD) of low peroxisome proliferating potency, the activities of CMTTD-CoA synthetase and palmitoyl-CoA synthetase were inhibited in mitochondrial and microsomal fractions. In contrast, all three sulphur-substituted acids induced the activity of palmitoyl-CoA synthetase and CMTTD-CoA synthetase in peroxisomes. Both the CMTTD-CoA and palmitoyl-CoA synthetase activities were induced by CMTTD and BCMTD, in close correlation to the induction of peroxisomal β-oxidation. During the three treatment regimes, CMTTD-CoA synthetase activity ran parallel to the palmitoyl-CoA synthetase activity at a rate of 50% in all cellular fractions. Thus, CMTTD is assumed to be activated by the long-chain acyl-CoA synthetase enzyme. Rats were treated for 5 days with sulphur- and oxy-substituted fatty acid analogues, clofibric acid and fenofibric acid. All compounds which induced peroxisomal β-oxidation activity in vivo could be activated to their respective CoA thioesters in liver homogenate. CETTD which induced peroxisomal β-oxidation only two-fold, was activated at a rate of 50% compared to palmitate. Fenofibric acid induced peroxisomal β-oxidation 9.6-fold, while it was activated at a rate of only 10% compared to palmitate. Thus, no correlation was found between rate of activation in vitro and induction of peroxisomal activity in vivo. On the other hand, tetradecylsulfoxyacetic acid (TSOA) and tetradecylsulfonacetic acid (TSA) (sulphuroxygenated metabolites of CMTTD) with no inductive effects, were not activated to their respective CoA derivatives. Altogether the data suggest that the enzymatic activation of the peroxisome proliferating compounds is essential for their proliferating activity, but the rate of activation does not determine the potency of the proliferators. The role of the xenobiotic-CoA pool in relation to the whole coenzyme A profile during peroxisome proliferation is discussed." @default.
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• W2095153621 date "1991-01-01" @default.
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• W2095153621 title "Peroxisome proliferating sulphur- and oxy-substituted fatty acid analogues are activated to acyl coenzyme a thioesters" @default.
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• W2095153621 doi "https://doi.org/10.1016/0006-2952(91)90010-3" @default.
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