作者:Tanja Richter、Thomas E. Mürdter、Georg Heinkele、Jürgen Pleiss、Stephan Tatzel、Matthias Schwab、Michel Eichelbaum、Ulrich M. Zanger
DOI:10.1124/jpet.103.056127
日期:2004.1
ticlopidine. Inhibition was attenuated by the presence of alternative active site ligands but not by nucleophilic trapping agents or reactive oxygen scavengers, further supporting mechanism-based action. A chemical mechanism is discussed based on the known metabolic activation of clopidogrel and on the finding that hemoprotein integrity of recombinant CYP2B6 was not affected by irreversible inhibition. These
噻吩并吡啶衍生物噻氯匹定和氯吡格雷是ADP诱导的血小板聚集的抑制剂。这些前药的药理活性取决于细胞色素P450(P450)依赖氧化为活性抗血栓形成剂。在这项研究中,我们通过使用人肝微粒体和重组表达的P450亚型研究了氯吡格雷和噻氯匹定的相互作用潜力。氯吡格雷和噻氯匹定均以最高的效价抑制CYP2B6,以较低的效价抑制CYP2C19。氯吡格雷也抑制CYP2C9,噻氯匹定也抑制CYP1A2,效力较低。CYP2B6的抑制作用是时间和浓度依赖性的,并且如透析实验所示,它是不可逆的并且依赖于NADPH,表明是基于机理的作用方式。灭活是非伪一阶类型,在微粒体(重组CYP2B6)中氯吡格雷和噻氯匹定的最大灭活率(K(inact))为0.35(1.5 min(-1))和0.5 min(-1)(0.8 min(- 1)),氯吡格雷的最大灭活剂浓度(KI)分别为0.5 microM(1.1 microM)和噻氯匹定为0