Title : Contribution of CYP3A isoforms to dealkylation of PDE5 inhibitors: a comparison between sildenafil N-demethylation and tadalafil demethylenation.

Pub. Date : 2015

PMID : 25744459






4 Functional Relationships(s)
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1 The aim of this study was to characterize the kinetics of metabolite formation of the phosphodiesterase type-5 (PDE5) inhibitors sildenafil and tadalafil by CYP3A4, CYP3A5, and CYP3A7 isoforms. Sildenafil Citrate cytochrome P450 family 3 subfamily A member 4 Homo sapiens
2 The formations of N-desmethyl sildenafil and desmethylene tadalafil were examined using CYP3A supersomes co-expressing human P450 oxidoreductase and cytochrome b5. Sildenafil Citrate cytochrome P450 family 3 subfamily A member 4 Homo sapiens
3 Both sildenafil N-demethylation and tadalafil demethylenation were catalyzed by CYP3A4, CYP3A5, and to a lesser extent by CYP3A7. Sildenafil Citrate cytochrome P450 family 3 subfamily A member 4 Homo sapiens
4 The intrinsic clearance (CLint) values of reactions 1 and 2 for sildenafil N-demethylation were 0.733 and 0.033 microL/min/pmol P450 for CYP3A4, 0.788 and 0.019 microL/min/pmol P450 for CYP3A5, and 0.079 and 0.004 microL/min/pmol P450 for CYP3A7, respectively. Sildenafil Citrate cytochrome P450 family 3 subfamily A member 4 Homo sapiens