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Vol. 27, Issue 1, 46-52, January 1999
Department of Comparative Biosciences and Environmental Toxicology
Center, 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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