Identification of cytochromes P450 involved in the human liver microsomal metabolism of the thromboxane A2 inhibitor seratrodast (ABT- 001)

Gondi N. Kumar, Erik Dubberke, A. David Rodrigues, Ellen Roberts, Jon F. Dennisen

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Seratrodast (ABT-001, AA-2414) undergoes cytochrome P450 (CYP)- dependent metabolism to a major (5-methylhydroxy seratrodast; 5-HOS) and a minor 4'-hydroxy seratrodast metabolite in human liver microsomes. The mean apparent K(m) and V(max) for the formation of 5-HOS were 15.5 μM and 589.0 pmol 5-HOS formed/mg protein/min, respectively. Chemical inhibition using isoform-selective CYP inhibitors, correlation of 5-HOS formation with several isoform-specific CYP activities in a panel of liver microsomes, metabolism by microsomes derived from CYP cDNA-expressed B-lymphoblastoid cells, and immunoinhibition by isoform-specific anti-CYP antibodies indicated that 5-HOS formation is catalyzed by CYP3A and CYP2C9/10, with a minor contribution from CYP2C8 and CYP2C19. At clinically relevant concentrations, seratrodast was found to inhibit tolbutamide methylhydroxylation (IC50 = 60 μM), (S)-mephenytoin 4'-hydroxylation (IC50 = 50 μM), and coumarin 7-hydroxylation (IC50 = 95 μM), indicating the potential for significant clinical interactions. The inducers of CYP3A and/or CYP2C9 (e.g. rifampicin and phenytoin) are likely to alter the disposition of seratrodast.

Original languageEnglish
Pages (from-to)110-115
Number of pages6
JournalDrug Metabolism and Disposition
Issue number1
StatePublished - Jan 1 1997
Externally publishedYes

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