Metabolism of 18-methoxycoronaridine, an ibogaine analog, to 18-hydroxycoronaridine by genetically variable CYP2C19.
Drug metabolism and disposition: the biological fate of chemicals June 1, 2002 Wenjiang Zhang, Yamini Ramamoorthy, Rachel F Tyndale et al. 17 citations
The ibogaine analog 18-methoxycoronaridine (18-MC) is metabolized primarily into 18-hydroxycoronaridine (18-HC) in human liver microsomes. This conversion is mainly catalyzed by the polymorphic enzyme CYP2C19, with a Michaelis constant (K_m) of 1.34 μM and maximum velocity (V_max) of 0.21 nmol/mg/min. Selective inhibition of CYP2C19 reduced 18-HC formation by 65%, and antibodies against CYP2C enzymes inhibited it by 70%. Other cytochrome P450 enzymes showed negligible involvement. The correlation between 18-MC metabolism and S-mephenytoin 4'-hydroxylase activity across five human liver samples further supports CYP2C19's primary role. These results suggest 18-MC could serve as a probe for CYP2C19 activity.