PMID: 8288035Nov 1, 1993Paper

Expression of P450 isoenzymes during rat liver organogenesis

The International Journal of Biochemistry
J T BorlakogluC R Wolf

Abstract

1. The expression of P450 isoenzymes in foetal and neonatal hepatic microsomes was determined by measuring the metabolism of marker substrates and by studying the expression of P450 isoenzymes at the protein and mRNA level. 2. Monooxygenase activities were not measurable at day 10 of gestation, but shortly before birth (day 20 of gestation) and thereafter a surge in monooxygenase activities was observed using ethoxyresorufin, aniline, nitroanisole, aminopyrine, dimethylnitrosamine and aldrin as substrates. 3. In contrast, as early as day 10 of gestation, post oxidative drug metabolism was measurable, when assessed for reactions catalysed by UDP-glucuronyltransferase, glutathione S-transferase and epoxide hydrolase. 4. Microsomal proteins isolated from foetal/perinatal rats did not crossreact with antibodies raised to CYP1A1, CYP1A2, CYP2A1, CYP2B1, CYP2E1, CYP3A1 and CYP4A1 at a protein loading of 3 micrograms total protein/well. 5. With the exception of CYP2E1 mRNA and CYP4A1 mRNA there was little evidence to suggest the expression of CYP1A1, CYP1A2 and CYP2A1 mRNA. 6. The mRNA of CYP2B1, CYP2C7 and CYP3A1 was not detectable in foetal/perinatal rat liver extracts at a loading rate of 10 micrograms total RNA. 7. Microsomal prot...Continue Reading

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