title: Alkoxyresorufin O-dealkylases: association with the murine Ah locus.
abstract: The hepatic microsomal dealkylation of a series of alkoxyresorufins and the oxidation of phenoxazone to resorufin were investigated in C57BL/6 and DBA/2 mice of both sexes. In both strains of mice and in both sexes the dealkylation rate decreased with increasing length of the alkyl chain. With all alkoxyresorufins the dealkylation rates were higher in the C57BL mice than the DBA mice, whereas the rate of phenoxazone hydroxylation was higher in the latter. In the C57BL mice, and to a lesser extent in the DBA mice, females were more efficient in dealkylating the resorufin ethers. Treatment with 3-methylcholanthrene (3MC) enhanced the rates of dealkylation of all alkoxyresorufins in the C57BL mice but not in the DBA mice, the extent of stimulation being highest for the propoxy- and butoxyresorufins and least for pentoxy-, heptoxy- and benzyloxyresorufins. The same treatment had no effect on the oxidation of phenoxazone in either strain of mice. It is concluded that the dealkylation of alkoxyresorufins, not the oxidation of phenoxazone, is associated with the murine Ah locus.
mesh_terms: D000818:Animals; D001189:Aryl Hydrocarbon Hydroxylases / Q000235:genetics*; D002874:Chromosome Mapping; D019388:Cytochrome P-450 CYP1A2; D003577:Cytochrome P-450 Enzyme System / Q000096:biosynthesis; D003580:Cytochromes / Q000096:biosynthesis; D003640:Dealkylation; D005260:Female; D008297:Male; D008748:Methylcholanthrene / Q000494:pharmacology; D051379:Mice; D008810:Mice, Inbred C57BL; D008811:Mice, Inbred DBA; D010078:Oxazines / Q000378:metabolism*; D012737:Sex Factors; D013045:Species Specificity; D013329:Structure-Activity Relationship
chemical_list: D003580:Cytochromes; D010078:Oxazines; C020456:phenoxazinone; D008748:Methylcholanthrene; C014180:resorufin; D003577:Cytochrome P-450 Enzyme System; D001189:Aryl Hydrocarbon Hydroxylases; C017170:Cyp1a2 protein, rat; D019388:Cytochrome P-450 CYP1A2