title: Liquid chromatographic-mass spectrometric method to assess cytochrome P450-mediated metabolism of testosterone by rat everted gut sacs.
abstract: A rapid, sensitive and specific method was developed for the simultaneous assay of testosterone, androstenedione and 6beta-hydroxytestosterone (6beta-OHT) in the TC199 tissue culture medium used in intestinal drug metabolism studies with the rat everted gut sac model. An electrospray LC-MS method was validated in the concentration range of 0.025-9.5 microM (7.2 ng-2.7 microg/mL) for testosterone and androstenedione and 0.01-4 microM (3 ng-1.2 microg/mL) for 6beta-hydroxytestosterone. The limits of quantification (LOQ) with an injection volume of 10 microL were 0.0005 microM (4.9 fmol, 1.4 pg injected), 0.004 microM (0.04 pmol, 11.4 pg injected) and 0.03 microM (0.3 pmol, 91 pg injected), respectively. The method also detected the other testosterone metabolites, the 16alpha-, 16beta-, 2beta- and 2alpha-hydroxytestosterones and was then used to study the metabolism of testosterone during its absorption by rat intestine in vitro, using everted gut sacs.
authors.affiliation: Laboratoire de Cinétique des Xénobiotiques, UMR 181, Physiopathologie et Toxicologie Experimentale (UPTE INRA-ENVT), Faculté des Sciences Pharmaceutiques, 35 Chemin des Maraîchers, 31062 Toulouse, France.
authors.forename: C
authors.initials: C
authors.lastname: Arellano
authors.forename: C
authors.initials: C
authors.lastname: Philibert
authors.forename: O
authors.initials: O
authors.lastname: Lacombe
authors.forename: J
authors.initials: J
authors.lastname: Woodley
authors.forename: G
authors.initials: G
authors.lastname: Houin
mesh_terms: D000818:Animals; D002853:Chromatography, Liquid / Q000379:methods*; D003577:Cytochrome P-450 Enzyme System / Q000378:metabolism*; D007421:Intestine, Small / Q000378:metabolism*; D008297:Male; D013058:Mass Spectrometry / Q000379:methods*; D051381:Rats; D017207:Rats, Sprague-Dawley; D012680:Sensitivity and Specificity; D013739:Testosterone / Q000378:metabolism*
chemical_list: D013739:Testosterone; D003577:Cytochrome P-450 Enzyme System