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The Ewha Medical Journal
Ewha Womans University School of Medicine

Ewha Med J 1988; 11(3):131-142

pISSN: 1598-7450

DOI: https://doi.org/10.12771/emj.1988.11.3.131

Original Article

The Effect of Phenobarbital on the Monooxygenase System in the Liver Microsomes of Neonatal, Immature and Adult Rats

Y.S. Hong, J.S. Lee
Corresponding author: J.S. Lee. Department of Biochemistry, College of Medicine, Ewha Womans University, Korea.

Copyright ⓒ 1988. Ewha Womans University School of Medicine. This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

Published Online: Jul 24, 2015

Abstract

A variety of compounds including drugs, carcinogens, steroids and fatty acids are metabolized by microsomal monooxygenase system in the liver. The effect of phenobarbital(PB) on the monooxygenase system in the liver microsomes of neonatal, immature- and adult-rats of both sexes were investigated. In the liver microsomes of rats, the activities of cytochrome P-450, NADPH-cytochrome C reductase, cytochrome b5, NADH-cytochrome C reductase, p-nitroanisole-O-demethylase and the formation of lipid peroxide were assayed : the following results were obtained. 1) In the liver microsomes of rats, the activities of cytochrome P-450 and NADPH-cytochrome C redutase were increased in PB treated rats compared to control. Among the developmental stages, the contents of hepatic microsomal cytochrome P-450 and NADPH-cytochrome C reductase were highest in the female adult rat and the male immature rat. 2) The contents of hepatic microsomal cytochrome b5 and NADH-cytochrome C reductase were increased in PB treated rats compared to control. Among the developmental stages the content of hepatic microsomal cytochrome b5 was highest in the female adult rat and the male immature rat, whereas the content of hepatic microsomal NADH-cytochrome C reductase was highest in the adult rats of both sexes. 3) The formation of lipid peroxide was increased in PB treated rats compared to control. Among the developmental stages the formation of lipid peroxide was highest in the female adult rat and the male immature rat. 4) The activity of hepatic microsomal p-nitroanisole-O-demethylase was increased in PB treated rats compared to control. Among the developmental stages the activity of p-nitroanisole-O-demethylase was highest in the female adult rat and the male immature rat.