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KMID : 0043320070300040469
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Archives of Pharmacal Research
2007 Volume.30 No. 4 p.469 ~ p.474
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Enzyme Kinetic Study of a New Cardioprotective Agent, KR-32570 using Human Liver Microsomes and Recombinant CYP Isoforms
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Kim Hyo-Jin
Kim Hyun-Mi
Seo Kyung-Ah
Lee Hye-Suk
Lee Choong-Hwan
Shin Jae-Kook
Liu Kwang-Hyun
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Abstract
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KR-32570 (5-(2-Methoxy-5-chlorophenyl)furan-2-ylcarbonyl)guanidine) is a new cardioprotective agent for preventing ischemia-reperfusion injury. Human liver microsomal incubation of KR-32570 in the presence of NADPH resulted in the formation of two metabolites, hydroxy- KR-32570 and O-desmethyl-KR-32570. In this study, a kinetic analysis of the metabolism of two metabolites from KR-32570 was performed in human liver microsomes, and recombinant CYP1A2, and CYP3A4. The metabolism for hydroxy- and O-desmethyl-KR-32570 formation from KR-32570 by human liver microsomes was best described by a Michaelis-Menten equation and a Hill equation, respectively. The Clint values of hydroxy- and O-desmethyl-KR-32570 formation were similar to each other (0.03 vs 0.04 μL/min/pmol CYP, respectively). CYP3A4 mediated the formation of hydroxy-KR-32570 from KR-32570 with Clint = 0.24 μL/min/pmol CYP3A4. The intrinsic clearance for O-desmethyl-KR-32570 formation by CYP1A2 was 0.83 μL/min/pmol CYP1A2. These findings suggest that CYP3A4 and CYP1A2 enzymes are major enzymes contributing to the metabolism of KR-32570.
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KEYWORD
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KR-32570, Enzyme kinetics, Microsomes, LC/MS/MS
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