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- W2039423436 abstract "Six species (CD-1 mouse, Fischer 344 rat, Syrian golden hamster, Duncan-Hartley guinea pig, half-lop rabbit and marmoset monkey) were treated orally with ciprofibrate, a potent oxyisobutyrate hypolipidaemic drug for 14 days. A dosedependent liver enlargement was observed in the mouse and rat and at the high dose level in the hamster. A marked dose-dependent increase in the 12-hydroxylation of lauric acid was observed in the treated mouse, hamster, rat, and rabbit, associated with a concomitant elevation in the specific content of cytochrome P-450 4A1 apoprotein, determined by an ELISA technique. Similarly, in these responsive species, an increase in mRNA levels coding for cytochrome P450 4A1 was observed. Lauric acid 12-hydroxylation was unchanged in the guinea pig and marmoset after ciprofibrate pre-treatment, and cytochrome P-450 4A1 was not detected immunochemically in liver microsomes from these latter species. In the untreated mouse, hamster, rat, and rabbit, the 12-hydroxylation of lauric acid was more extensive than the 11-hydroxylation, whereas in the guinea pig and marmoset the activity ratios were reversed, with 11-hydroxylation predominating. Peroxisomal fatty acid β-oxidation was markedly induced in the mouse, hamster, rat, and rabbit on treatment at the higher dose level (39-, 3-, 13- and 5-fold, respectively) and was slightly increased in the marmoset (2-fold), yet was unchanged in the guinea pig following treatment. In the marmoset the increase in peroxisomal β-oxidation was 3- to 4-fold at the high dose level; however, the dose levels used in the marmoset were 20 and 100 mg/kg as opposed to 2 and 20 mg/kg in the other species. The differences in the foregoing hepatic enzyme responses to ciprofibrate between the species examined in our studies indicate a specific pattern of enzyme changes in responsive species. In the responsive species (rat, mouse, hamster, and rabbit), cytochrome P-450 4A1 specific content and related enzyme activity were increased concomitant with elevated peroxisomal β-oxidation. By contrast, the marmoset and guinea pig lack the coordinate hepatic induction of peroxisomal and microsomal parameters and may be categorized as less responsive species. Accordingly, the rat hepatic responses to peroxisome proliferators cannot confidently be used to predict biological responses in primates, with obvious implications for the extrapolation of animal data to man." @default.
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- W2039423436 date "1992-01-01" @default.
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- W2039423436 title "Species differences in ciprofibrate induction of hepatic cytochrome p450 4A1 and peroxisome proliferation" @default.
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- W2039423436 doi "https://doi.org/10.1002/jbt.2570070308" @default.
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