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- W2013016657 abstract "Both indinavir and troleandomycin (CYP3A inhibitors) are incapable of completely inhibiting dextromethorphan metabolism to 3-methoxymorphinan in human liver microsomes. It is hypothesized that CYPs in addition to CYP3A4 and 3A5 contribute to this biotransformation. The effect of CYP-selective inhibitors on the residual 3-methoxymorphinan activity in human liver microsomes (i.e. in the presence of 30 microM indinavir, a selective CYP3A4 and 3A5 inhibitor) was measured to identify these enzymes. At this concentration, indinavir completely inhibited the formation of 3-methoxymorphinan by rCYP3A4 and rCYP3A5. In addition, the formation kinetics of 3-methoxymorphinan in rCYPs was measured. Only CYP2B6, 2C8 and 2C18 were considered likely candidates as contributors to residual 3-methoxymorphinan activity. The residual 3-methoxymorphinan activity was highly correlated with CYP2B6 activity as measured by CYP2B6 antibody (r(2)=0.90, p<0.001) and by orphenadrine (r(2)=0.97, p<0.001), but was not correlated (r(2)=0.12, p>0.05) with CYP2C8 activity. Collectively, these findings suggest that CYP2B6 is a major contributor towards residual 3-methoxymorphinan activity, while CYP2C8 and 2C18 are either minor contributors or do not contribute to this metabolic process." @default.
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- W2013016657 date "1999-10-01" @default.
- W2013016657 modified "2023-10-16" @default.
- W2013016657 title "Enzymes in addition to CYP3A4 and 3A5 mediateN-demethylation of dextromethorphan in human liver microsomes" @default.
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- W2013016657 doi "https://doi.org/10.1002/(sici)1099-081x(199910)20:7<341::aid-bdd195>3.0.co;2-f" @default.
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