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中国临床药理学与治疗学 ›› 2014, Vol. 19 ›› Issue (3): 241-245.

• 基础研究 •    下一篇

大黄素的Ⅰ相代谢途径及其对细胞色素P450酶的抑制作用

王来友1, 李镜清2, 陈涛1, 唐千捷1, 陈玲燕2   

  1. 1广东药学院中医药研究院,广东省中医药防治代谢性疾病重点实验室, 广州 510006,广东;
    2中山大学临床药理研究所,广州 510006,广东
  • 收稿日期:2013-06-17 修回日期:2014-03-13 出版日期:2014-03-26 发布日期:2014-04-10
  • 作者简介:王来友,男,博士,研究方向:药物代谢动力学与内分泌代谢药理。Tel: 020-39352607 E-mail: wanglaiyou@gdpu.edu.cn
  • 基金资助:
    国家自然科学基金青年基金资助项目(81102502);第46批教育部留学回国人员科研启动基金资助项目

Investigation on P450s involved in emodin's phaseⅠmetabolism and inhibitory effect of emodin on P450s

WANG Lai-you1, LI Jing-qing2, CHEN Tao1, TANG Qian-jie1, CHEN Ling-yan2   

  1. 1Institute of Chinese Medicinal Sciences, Guangdong Pharmaceutical University, Guangdong TCM Keboratory for Mefabolic Diseases, Guangzhou 510006, Guangdong,China;
    2Institute of Clinical Pharmacology, Sun Yat-sen University, Guangzhou 510006, Guangdong,China
  • Received:2013-06-17 Revised:2014-03-13 Online:2014-03-26 Published:2014-04-10

摘要: 目的: 考察大黄素的I相代谢途径及其对细胞色素P450酶的影响,为预测临床上可能的大黄素-药物相互作用提供实验依据。方法: 分别应用人肝微粒体和重组CYP3A4酶与大黄素及CYP3A4抑制剂酮康唑(KTZ)共孵育 20 min,LC-MS/MS检测分析大黄素原型药物含量的变化;体外Cocktail法评价大黄素对8种P450亚型酶的抑制作用。结果: 大黄素与人肝微粒体或重组CYP3A4酶共孵育后,大黄素剩余量分别为 68.5%和 0.015%,加入 100 μmol/L 的KTZ后,消除率分别降至 0.1%和 27.7%。体外肝微粒体cocktail实验结果表明,大黄素对大鼠肝微粒体中CYP1A2、CYP2C9、CYP2D6有中等强度抑制作用,IC50分别为 3.31、2.60 和 2.56 μmol/L。结论: 大黄素I相代谢主要由CYP3A4介导,对多种P450酶具有抑制作用,临床使用含大黄素相关制剂应注意可能涉及的药物相互作用。

关键词: 药物相互作用, 大黄素, 药物代谢酶, 孕烷X受体, 抑制剂

Abstract: AIM: To identify the P450s involved in emodin's phaseⅠmetabolism and inhibitory effect of emodin on the P450s, in order to provide experimental evidence for predicting possible emodin-drug interactions.METHODS: Human liver microsome and recombinant P450 enzymes were incubated with emodin and CYP3A4 inhibitor ketoconazole (KTZ) for 20 mins in vitro, emodin concentrations were determined by LC-MS/MS method. Inhibitory effects of emodin on the P450 enzyme isoforms were investigated using an established in vitro cocktail incubation approach in our lab.RESULTS: Co-incubation with human liver microsomes and recombinant CYP3A4 system in vitro showed that emodin remains 68.5% and 0.015% of the initial content, 100 μmol/L KTZ could decrease the elimination rate to 0.1% and 27.7% respectively. The results from the cocktail experiment indicated that emodin had a moderate inhibition on CYP1A2, CYP2C9, CYP2D6 with IC50 as 3.31, 2.60, 2.56 μmol/L respectively.CONCLUSION: CYP3A4 plays a key role for emodin biotransformation in phaseⅠmetabolism, possessing the inhibitory effect on multiple P450s. Attention should be paid to avoid the possible emodin-drug interaction when emodin-containing preparations are prescribed with substrates of these mentioned P450s.

Key words: drug interactions, emodin, metabolic enzyme, pregnane X receptor, inhibitor

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