Choi SJ, Ji HY, Lee HY, Kim DS, Kim WB, Lee HS. In vitro metabolism of a novel phosphodiesterase-5 inhibitor DA-8159 in rat liver preparations using liquid chromatography/electrospray mass spectrometry.
Biomed Chromatogr 2002;
16:395-9. [PMID:
12228896 DOI:
10.1002/bmc.173]
[Citation(s) in RCA: 17] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
The in vitro metabolism of a new erectogenic, DA-8159, has been studied by LC with UV detection and on-line LC-electrospray mass spectrometry using rat hepatic microsomal incubation and rat liver perfusion. Both rat liver microsomal incubation of DA-8159 in the presence of NADPH and single-pass liver perfusion of DA-8159 resulted in the formation of three metabolites (M1-3). M1 was tentatively identified as hydroxy-DA-8159. M2 and M3 were identified as N-demethyl-DA-8159 and 5-(2-propyloxy-5-aminosulphonylphenyl)-1-methyl-3-propyl-1,6-dihydro-7H-pyrazolo(4,3-d)pyrimidin-7-one (DA-8164), respectively, on the basis of LC-MS/MS analysis with authentic standards. Rat CYP2D1 was a major isozyme for the formation of hydroxy-DA-8159 and N-demethyl-DA-8159. CYP2C12 and CYP1A1 catalysed the oxidation of DA-8159 to DA-8164.
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