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Vol. 27, Issue 1, 46-52, January 1999

Species and Sex Differences in Expression of Flavin-Containing Monooxygenase Form 3 in Liver and Kidney Microsomes

Sharon L. Ripp, Kiyoshi Itagaki, Richard M. Philpot, and Adnan A. Elfarra

Department of Comparative Biosciences and Environmental Toxicology Center, University of Wisconsin-Madison (S.L.R., A.A.E.); and National Institute for Environmental Health Sciences, Research Triangle Park, North Carolina (K.I., R.M.P.)

Flavin-containing monooxygenase (FMO) 3 is the predominant FMO isoform in adult human liver; however, little is known about its expression in common laboratory species. Studies have shown FMO3 levels to be sex-dependent in mouse liver, but not in human liver. The current study was undertaken to determine the expression of FMO3 in liver and kidney microsomes from multiple species, and to determine whether the sex dependence seen in mouse liver extends to other species and/or tissues. FMO3 had previously been shown to be the major FMO involved in methionine S-oxidation in rat and rabbit liver microsomes. In this study, species differences in FMO3 levels were assessed in liver microsomes from humans, rats, dogs, mice, and rabbits, and in kidney microsomes from rats, dogs, mice, and rabbits, by comparing methionine S-oxidase activities. Species differences were noted in male liver microsomes, with rabbits having 3-fold higher methionine S-oxidase activity than mice and dogs and 1.5-fold higher activity than humans and rats. Species differences were also noted in male and female kidney microsomes, with rats exhibiting 2- to 6-fold higher methionine S-oxidase activity than the other species. Sex differences in FMO3 levels were assessed using methionine S-oxidase activity and immunoblotting, and were noted only in liver microsomes from mice and dogs, with females having higher levels than males. Results also show that FMO3 orthologs from multiple species are catalytically similar with regard to methionine, S-allyl-L-cysteine, and S-(1,2-dichlorovinyl)-L-cysteine S-oxidations.


Copyright © 1999 by The American Society for Pharmacology and Experimental Therapeutics



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