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Xenobiotica
the fate of foreign compounds in biological systems
Volume 23, 1993 - Issue 4
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Research Article

Non-induction of extrahepatic antipyrine and metronidazole metabolism evaluated from partially hepatectomized rats

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Pages 411-418 | Received 25 Aug 1992, Accepted 11 Jan 1993, Published online: 22 Sep 2008
 

Abstract

1. The effect of β-naphthoflavone (BNF), given i.p. (n = 9) and orally (n = 9), on the metabolism of antipyrine and metronidazole was investigated in rats.

2. The clearances of antipyrine and metronidazole were determined on a single saliva sample. The rates of formation of antipyrine and metronidazole metabolites were determined from a 20 h urine sample and saliva clearance.

3. Administration of β-naphthoflavone i.p. was significantly more effective than oral dosage on the induction of antipyrine and metronidazole metabolism (p<0.05).

4. The capacity of extrahepatic tissues to metabolize antipyrine and metronidazole was quantitatively assessed in rats with and without pretreatment with β-naphthoflavone immediately after sham operation or 70% partial hepatectomy (n = 40).

5. Antipyrine and metronidazole clearances correlated with liver weight in induced and non-induced rats. Linear regression of antipyrine and metronidazole clearances did show a non-significant Y-intercept (p>0.05), indicating a negligible extrahepatic metabolism in both induced and in non-induced rats.

6. From a quantitative point of view this study indicates that induction of extrahepatic cytochrome P450 metabolism of antipyrine and metronidazole is negligible.

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