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Influence of FMO1 and 3 polymorphisms on serum olanzapine and its N-oxide metabolite in psychiatric patients.
MedLine Citation:
PMID:  23147717     Owner:  NLM     Status:  Publisher    
The widely used antipsychotic drug, olanzapine (OLA) shows large interindividual variability in metabolic clearance. Although the role of the enzymes CYP1A2, CYP2D6 and UGT1A4 has been extensively explored, little is known about the in vivo role of flavin-containing monooxygenases (FMOs) catalyzing the N-oxidation of OLA in vitro. We investigated the influence of FMO1 and 3 polymorphisms on the steady state serum concentrations of OLA and its N-oxide metabolite in 379 patients. The upstream FMO1*6 was associated with increased dose-adjusted serum OLA concentrations (C/Ds; P=0.008), an effect further enhanced by FMO1rs7877C>T in smokers. The influence of FMO3 polymorphisms was limited to variability in OLA N-oxide. Homozygous carriers of FMO3rs2266780A>G (p.E308G) displayed 50% lower C/D of OLA N-oxide compared with subjects homo- or heterozygous for the A-variant (P<0.003). Our data support the role of FMO3 in the N-oxidation of OLA and implicate for the first time the contribution of FMO1 and its functional *6 variant in OLA disposition.The Pharmacogenomics Journal advance online publication, 13 November 2012; doi:10.1038/tpj.2012.47.
M M Söderberg; T Haslemo; E Molden; M-L Dahl
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-11-13
Journal Detail:
Title:  The pharmacogenomics journal     Volume:  -     ISSN:  1473-1150     ISO Abbreviation:  Pharmacogenomics J.     Publication Date:  2012 Nov 
Date Detail:
Created Date:  2012-11-13     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101083949     Medline TA:  Pharmacogenomics J     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Department of Medical Sciences, Clinical Pharmacology, Uppsala University, Uppsala, Sweden.
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