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- W2108164920 abstract "The activities of a number of lipid-metabolizing and subcellular marker enzymes were measured in total homogenates and subcellular fractions prepared from the livers of male rats fed diets containing 0.05, 0.1, 0.3, and 0.5% of the hypolipidemic drug tiadenol, resulting in mean drug intake of 45, 90, 330, and 530 mg/day/kg body wt, respectively. In the total homogenates, a massive induction of palmitoyl-CoA hydrolase and peroxisomal palmitoyl-CoA oxidation accompanied by increased free CoASH and long-chain acyl-CoA content was observed at the highest dose levels whereas little change occurred up to 90 mg/day/kg/body wt. The palmitoyl-CoA synthetase activity increased slightly up to 90 mg/day/kg body wt, but higher doses resulted in decreased enzyme activity. Catalase activity increased with the dose to be elevated by a factor of approximately 1.6 at 330 mg/day/kg, whereas the activities of urate oxidase decreased. The specific activities of palmitoyl-CoA hydrolase and peroxisomal palmitoyl-CoA oxidation increased in all fractions, but most markedly in the cytosol. The changes in the activities and the distribution of subcellular marker enzymes and the increase of the peroxisome-associated polypeptide (PPA-80) are in keeping with a peroxisome proliferating effect resulting in formation of premature organelles with altered properties. Since high doses of many hypolipidemic drugs produce hepatic tumors and peroxisomal proliferation in rodents and since no increase in peroxisomes is found in human liver after therapeutic use of lower doses, the dose-response relationship is of interest for the evaluation of the toxicology of this class of agents." @default.
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- W2108164920 date "1984-03-01" @default.
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- W2108164920 title "Enzymatic changes in rat liver associated with low and high doses of a peroxisome proliferator" @default.
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- W2108164920 doi "https://doi.org/10.1016/0041-008x(84)90050-4" @default.
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