title: Sex-dependent pharmacokinetics of S(-)-hydroxyhexamide, a pharmacologically active metabolite of acetohexamide, in rats.
abstract: The pharmacokinetic profile of S(-)-hydroxyhexamide (S-HH), a pharmacologically active metabolite of acetohexamide, was examined in male and female rats. S-HH was eliminated more rapidly from plasma in the males than in the females. A significant sex difference was observed in the pharmacokinetic parameters of S-HH in rats. Testectomy caused significant alteration in these parameters of S-HH in male rats, whereas ovariectomy did not in the females. The co-administration of sulfamethazine significantly decreased the plasma clearance (CL(p)) of S-HH in male rats, but had no effect in the females. The plasma concentrations of acetohexamide generated from S-HH showed no sex-related difference. Furthermore, there was no difference in the accumulation of S-HH by renal cortical slices from male and female rats. We propose the possibility that the sex-dependent pharmacokinetics of S-HH in rats is mediated through the male-specific hydroxylation of the cyclohexyl ring catalyzed by a major cytochrome p450 (CYP) isoform (CYP2C11), although the detailed mechanism remains to be elucidated.
authors.affiliation: Faculty of Pharmaceutical Sciences, Kumamoto University, 5-1, Oe-honmachi, Kumamoto 862-0973, Japan. yorishig@gpo.kumamoto-u.ac.jp
authors.forename: Yorishige
authors.initials: Y
authors.lastname: Imamura
authors.forename: Miho
authors.initials: M
authors.lastname: Kaneko
authors.forename: Hidenori
authors.initials: H
authors.lastname: Takada
authors.forename: Masaki
authors.initials: M
authors.lastname: Otagiri
authors.forename: Hideaki
authors.initials: H
authors.lastname: Shimada
authors.forename: Hiroyuki
authors.initials: H
authors.lastname: Akita
mesh_terms: D000092:Acetohexamide / Q000008:administration & dosage / Q000031:analogs & derivatives* / Q000097:blood / Q000378:metabolism* / Q000493:pharmacokinetics*; D000818:Animals; D005260:Female; D008297:Male; D051381:Rats; D017208:Rats, Wistar; D012727:Sex Characteristics; D000096926:Benzenesulfonamides
chemical_list: D000092:Acetohexamide; C020362:hydroxyhexamide; D000096926:Benzenesulfonamides