Application of chemical P450 model systems to studies on drug metabolism. I. Phencyclidine. A multi-functional model substrate.
作者:Hiroshi MASUMOTO、Kaoru TAKEUCHI、Shigeru OHTA、Masaaki HIROBE
DOI:10.1248/cpb.37.1788
日期:——
Cytochrome P450 model and liver microsomal oxidations of drugs were compared using phencyclidine. In general, the chemical reaction systems produced many oxidation products. Besides the formation of the cyclohexane-4-hydroxyl compound (2), hydroxylation of the aromatic ring was favored in the Fenton reaction system (Fe2++H2O2). Formation of an m-hydroxylated product (m-5) was the main aromatic oxidation pathway in the Udenfriend reaction (Fe2+-ascorbic acid-O2), and 2, the piperidine-3-hydroxyl compound (3), and the piperidine-4-hydroxyl compound (4) were also formed. In the system using meso-tetraphenylporphinatoiron chloride (Fe(III)TPPC1) with an oxidant, the main product was the piperidine-3-oxo compound (8). In the liver microsomes system, 2, 4, 8, and m-5, which were all generated by the chemical oxidation reactions, were detected as metabolites of phencyclidine. They were formed by cytochrome P450-dependent reactions. Chemical oxidation systems can be used to study drug metabolism; they can reveal some tendencies of the real metabolis reactions, are easy to operate, and yield sufficient amounts of product.
使用苯环利定比较了细胞色素P450模型和肝微粒体的药物氧化。一般来说,化学反应系统产生了许多氧化产物。除了形成环己烷-4-羟基化合物(2)外,在芬顿反应体系(Fe2++H2O2)中芳香环的羟基化反应被优先生成。在尤登友反应(Fe2+-抗坏血酸-O2)中,形成m-羟基化产物(m-5)是主要的芳香氧化途径,同时也形成了化合物2、哌啶-3-羟基化合物(3)和哌啶-4-羟基化合物(4)。在使用含氧化剂的美索-四苯基卟啉铁氯化物(Fe(III)TPPC1)体系中,主要产物是哌啶-3-氧化物(8)。在肝微粒体系统中,2、4、8和m-5都是通过化学氧化反应生成的苯环利定代谢物,它们是通过细胞色素P450依赖的反应形成的。化学氧化系统可用于研究药物代谢;它们能够揭示一些真实代谢反应的趋势,操作简单,并能产生足够的产物。