细胞色素P4502C亚家族的细胞色素P450对磺胺甲恶唑的n4 -羟化作用和人、大鼠肝微粒体中磺胺甲恶唑羟胺的还原。

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引用

克里布AE,斯皮尔伯格SP,格里芬GP

细胞色素P4502C亚家族的细胞色素P450对磺胺甲恶唑的n4 -羟化作用和人、大鼠肝微粒体中磺胺甲恶唑羟胺的还原。

《药物代谢处置》1995 3;23(3):406-14。

PubMed ID
7628308 (PubMed视图
]
摘要

磺胺甲恶唑(SMX)的n4 -羟基化到其羟胺(SMX- ha)代谢物是形成活性代谢物的第一步,负责介导与该化合物相关的超敏反应。在大鼠肝脏微粒体中,苯巴比妥预处理大鼠后,nadph依赖性的SMX氧化为SMX- ha增加了3倍。其他细胞色素P450 (CYP)诱导剂无效。甲苯丁胺抑制了本构和诱导的SMX n -羟基化活性,SMX- ha活性的诱导与CYP2C6标记物孕酮21-羟基化酶活性的诱导平行。抗cyp2c6抗血清可抑制苯巴比妥处理大鼠肝微粒体中SMX n -羟基化70%。因此,大鼠肝脏微粒体对SMX的n4 -羟基化是由CYP2C亚家族成员介导的,可能是CYP2C6。在一组人类微粒体中,SMX-HA的形成与甲苯丁胺羟化酶活性相关(r = 0.75;P = 0.01);CYP2C9含量(r = 0.79;p < 0.01), 500 μ m甲苯丁胺抑制70%,100 μ m磺胺唑抑制90%。 Recombinant CYP2C9 catalyzed the N-hydroxylation of SMX. SMX-HA formation in human hepatic microsomes was therefore mediated predominantly by CYP2C9. CYP-mediated reduction of SMX-HA to SMX was markedly induced in dexamethasone and phenobarbital-treated rat hepatic microsomes, and was attributed to CYP3A and CYP2B forms. In uninduced rat and human hepatic microsomes, SMX-HA reduction was mediated predominantly by an NADH-dependent microsomal hydroxylamine reductase under aerobic conditions. Under anaerobic conditions, troleandomycin at > or = 1 microM inhibited the reduction of SMX-HA in human hepatic microsomes by 45%, whereas sulfaphenazole had no effect.(ABSTRACT TRUNCATED AT 250 WORDS)

引用本文的药物库数据

药物酶
药物 种类 生物 药理作用 行动
磺胺甲恶唑 细胞色素P450 2C9 蛋白质 人类
未知的
底物
抑制剂
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