Please use this identifier to cite or link to this item: http://hdl.handle.net/2440/14588
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dc.contributor.authorColler, J.en
dc.contributor.authorSomogyi, A.en
dc.contributor.authorBochner, F.en
dc.date.issued1999en
dc.identifier.citationXenobiotica, 1999; 29(10):973-986en
dc.identifier.issn0049-8254en
dc.identifier.issn1366-5928en
dc.identifier.urihttp://hdl.handle.net/2440/14588-
dc.description.abstractThe aims were to examine the kinetics of the oxidative metabolism of flunitrazepam in vitro when flunitrazepam was dissolved in dimethylformamide and acetonitrile, and to determine which cytochrome P450 isoform(s) are involved. The kinetics of the formations of 3'-hydroxyflunitrazepam and desmethyl-flunitrazepam were non-linear and best estimated using the Hill equation. Inhibition of their formation was studied using specific chemical inhibitors, expressed enzyme systems and specific antibodies. Ks, Vmax, Clmax and n (slope factor) for the formation of 3'-hydroxyflunitrazepam and desmethylflunitrazepam had ranges of 165-338 and 179 391 microM, 22-81 and 3-10 nmol x mg protein(-1) x h(-1), 6-17 and 0.9-1.9 microl x mg protein(-1) x h(-1), and 2.3-3.6 and 1.6-2.6 respectively when dimethylformamide was the organic solvent. When acetonitrile was the solvent, Ks, Vmax, Clmax and n (slope factor) for the formation of 3'-hydroxyflunitrazepam and desmethylflunitrazepam had ranges of 173-231 and 74-597 microM, 35-198 and 2.7-48 nmol.mg protein(-1) x h(-1), 1347 and 0.7-6.3 microl.mg protein(-1) x h(-1), and 1.5-3.6 and 1.1-2.7 respectively. CYP2C19, CYP3A4 and CYP1A2 mediated the formation of both 3'-hydroxyflunitrazepam and desmethylflunitrazepam. Investigators need carefully to consider the choice of organic solvent to avoid false CYP identification.en
dc.language.isoenen
dc.publisherTAYLOR & FRANCIS LTDen
dc.subjectMicrosomes, Liver; Humans; Dimethylformamide; Acetonitriles; Flunitrazepam; Benzoflavones; Cytochrome P-450 Enzyme System; Aryl Hydrocarbon Hydroxylases; Mixed Function Oxygenases; Antibodies, Monoclonal; Solvents; Enzyme Activation; Oxidation-Reduction; Kinetics; Genotype; Adult; Aged; Middle Aged; Female; Male; Cytochrome P-450 CYP3A; Cytochrome P-450 CYP2C19en
dc.titleFlunitrazepam oxidative metabolism in human liver microsomes: involvement of CYP2C19 and CYP3A4en
dc.typeJournal articleen
dc.identifier.rmid0030003366en
dc.identifier.doi10.1080/004982599238056en
dc.identifier.pubid67372-
pubs.library.collectionPharmacology publicationsen
pubs.verification-statusVerifieden
pubs.publication-statusPublisheden
dc.identifier.orcidColler, J. [0000-0002-8273-5048]en
dc.identifier.orcidSomogyi, A. [0000-0003-4779-0380]en
Appears in Collections:Pharmacology publications

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