目的 研究吡咯里嗪类ML-3000及其两种NO供体衍生物ML-4000和ML-5000对人P450同工酶CYP2D6、CYP1A2、CYP2C9、CYP2C19和CYP3A4的体外抑制作用。方法 采用Gentest公司的高通量P450酶抑制剂筛选试剂盒（High throughput Inhibitor Screening Kit），测定ML-3000、ML-4000和ML-5000对五种P450同工酶CYP2D6、CYP1A2、CYP2C9、CYP2C19和CYP3A4的体外抑制作用。结果 ML-3000、ML-4000和ML-5000抑制CYP3A4的IC₅₀分别为7.07、0.40、2.82 μmol/L，对其他4个酶（CYP1A2、CYP2D6、CYP2C9和CYP2C19）的IC₅₀均大于10 μmol/L。结论 3种化合物对CYP3A4活力均有抑制作用，其中ML-4000的抑制能力最强。3种化合物对其他4个酶基本没有抑制作用。

Objective To investigate the inhibition of ML-3000 and two NO donor derivatives in pyrrolizine on five human cytochrome P450 isozymes CYP2D6, CYP1A2, CYP2C9, CYP2C19, and CYP3A4. Methods Inhibition of ML-3000, ML-4000, and ML-5000 on five human cytochrome P450 isozymes CYP2D6, CYP1A2, CYP2C9, CYP2C19, and CYP3A4 was determined with High Throughput Inhibitor Sceening Kit. Results IC₅₀ values of ML-3000, ML-4000, and ML-5000 to CYP3A4 were 7.07, 0.40, and 2.82 μmol/L, respectively. IC₅₀ values of ML-3000, ML-4000, and ML-5000 to others were more than 10 μmol/L. Conclusion Three compounds have the inhibitory effects on CYP3A4. Among them, ML-4000 has the strongest inhibition. The three compounds show no inhibition on the other four enzymes.