酮康唑对健康成人肝细胞微粒体细胞色素P450同工酶3A4、1A2活性的作用

目的 观察酮康唑对健康成人肝细胞微粒体细胞色素P450同工酶3A4、1A2活性的作用,为临床上安全有效地联合用药提供实验依据.方法 采用健康成人肝细胞微粒体,分为对照组和处理组.酮康唑处理组分别加入不同浓度的酮康唑1 ml,对照组仅加入培养液,孵育15 min后再加入CYP450同工酶3A4和1A2的相应底物(分别为睾酮和非那西丁)再孵育20 min.反应终止后用高效液相色谱仪测量代谢产物(分别为6β-羟基睾酮与对乙酰氨基酚)的生成量,分别代表3A4和1A2的活性.结果 细胞色素P450同工酶3A4的相对活性百分比减小到对照组50%时(IC50)酮康唑的质量浓度为0.16mg/L.而同工酶3A4的相对活性百分比随质量浓度酮康唑增加逐渐减小,各处理组与对照组比较差异均有显著性意义(P＜0.05).低剂量细胞色素P450同工酶1A2的相对活性百分比处理组与对照组比较明显降低(P＜0.05),高剂量细胞色素P450同工酶1A2的相对活性百分比处理组与对照组比较则明显升高(P＜0.05).结论 酮康唑对健康成人肝细胞微粒体细胞色素P450同工酶3A4的活性有抑制作用.然而对细胞色素P450同工酶1A2的活性则是低剂量有抑制作用,衙高剂量有诱导作用.

Effect of ketoconazole on the activity of CYP4503A4 and CYP450 1A2 of hepatic microsomes in healthy adults

Objective To observe the effect of ketoconazole on the activity of cytochrome P450(CYP) 1A2 and 3A4 in hepatic microsomes of healthy adults.Methods Human hepatic microsomes obtained from healthy adults were randomly divided into control group and ketoconazole-treatment groups at different concentrations.After 15 min of culture,the substrates(testosterone for CYP3A4 and phenacetin for CYP1A2) were added and incubated for another 20 min.The metabolites(6-testosterone and acetaminophen) were then measured with...