title: On the occurrence of cytochrome P-450 and aryl hydrocarbon hydroxylase activity in rat brain.
abstract: The difference spectra of the carbon monoxide-complex of dithionite-reduced rat brain microsomes, compared with both reduced microsomes, alone, and the carbon monoxide-complex of oxidized microsomes, indicate the presence of small amounts of cytochrome P-450 in brain. As in liver, cytochrome P-450 in brain is degraded in vitro to its inactive form, cytochrome P-420 by methylmercury chloride. Aryl hydrocarbon hydroxylase activity is also present in rat brain microsomes and, at lower specific activity, in brain homogenates. This carcinogen metabolizing activity is increased four-fold in rats pretreated with 3-methylcholanthrene.
mesh_terms: D000818:Animals; D001189:Aryl Hydrocarbon Hydroxylases / Q000378:metabolism*; D001921:Brain / Q000201:enzymology*; D002248:Carbon Monoxide / Q000378:metabolism; D003577:Cytochrome P-450 Enzyme System / Q000378:metabolism*; D003580:Cytochromes / Q000378:metabolism; D004227:Dithionite / Q000378:metabolism; D008297:Male; D008748:Methylcholanthrene / Q000494:pharmacology; D008767:Methylmercury Compounds / Q000378:metabolism; D008861:Microsomes / Q000378:metabolism; D009243:NAD / Q000494:pharmacology; D051381:Rats
chemical_list: D003580:Cytochromes; D008767:Methylmercury Compounds; D009243:NAD; D004227:Dithionite; D008748:Methylcholanthrene; D002248:Carbon Monoxide; D003577:Cytochrome P-450 Enzyme System; D001189:Aryl Hydrocarbon Hydroxylases