Abstract
The characteristic nature of the drug-metabolizing system in fetal liver microsomes of rats was investigated. The aminopyrine(AM)- and the hexobarbital (HB)-metabolizing activities in fetal liver microsomes of the 21st day of pregnancy were induced by the maternal administration of 3-methylcholanthrene (3-MC) once daily on the 18th and the 19th day of pregnancy, while they were inhibited in maternal liver microsomes. The inductions of the AM- and the HB-metabolizing enzymes in fetal liver microsomes of rat by the maternal administration of 3-MC occurred exclusively in fetal period and simultaneously hemoprotein like phenobarbital-induced type P-450 different from that in maternal liver microsomes was newly induced in fetal liver microsomes of rats.
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