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中国临床药理学与治疗学 ›› 2014, Vol. 19 ›› Issue (2): 156-161.

• 基础研究 • 上一篇    下一篇

柠檬苦素在大鼠肝微粒体中代谢的性别差异

王军青1, 陈爱瑛2, 董文彬2, 程敏2, 郑高利2   

  1. 1浙江中医药大学药学院,杭州 310053,浙江;
    2浙江省医学科学院药物研究所,杭州 310013,浙江
  • 收稿日期:2013-10-07 修回日期:2014-02-15 出版日期:2014-02-26 发布日期:2014-03-31
  • 通讯作者: 郑高利,男,研究员,硕士生导师,研究方向为临床药理学及药物安全性评价。Tel: 0571-88215620 E-mail: gaoli-z@163.com
  • 作者简介:王军青,男,硕士研究生,研究方向为临床药理学与药代动力学。Tel: 0571-88215620 E-mail: zqwang12@163.com
  • 基金资助:
    浙江省医学重点学科群项目(XKQ-010-001);浙江省中医药科学研究基金项目(2011ZB019)

Gender difference of limonin metabolism in rat liver microsomes

WANG Jun-qing1, CHEN Ai-ying2, DONG Wen-bin2, CHENG Min2, ZHENG Gao-li2   

  1. 1College of Pharmaceutical Science,Zhejiang University of Traditional Chinese Medicine,Hangzhou 310053,Zhejiang,China;
    2Institute of Materia Medica,Zhejiang Academy of Medical sciences,Hangzhou 310013,Zhejiang,China
  • Received:2013-10-07 Revised:2014-02-15 Online:2014-02-26 Published:2014-03-31

摘要: 目的: 研究柠檬苦素在大鼠肝微粒体中代谢的性别差异以及引起性别差异的可能的CYP450亚型。方法: 柠檬苦素与雌雄大鼠肝微粒体共同孵育,抑制实验为在肝微粒体中加入特异性CYP450抑制剂后,再加入柠檬苦素共同孵育,温孵后的样品乙醚提取后进行HPLC分析。结果: 柠檬苦素在雌雄大鼠肝微粒体中代谢的表观酶动力学参数分别为:米氏常数Km:(12±3)、(16±4) μg/mL,最大反应速度Vmax:(49±6)、(93±14) ng·min-1·mg-1。柠檬苦素在雌雄大鼠肝微粒体中孵育 30 min 的代谢率分别为(33.9±4.7)%和(53.8±2.8)%,代谢速度分别为(4.46±0.62)和(7.08±0.37) ng·min-1·mg-1。CYP3A2特异性抑制剂酮康唑、CYP2C11特异性抑制剂西咪替丁对柠檬苦素的代谢抑制作用明显,CYP1A2特异性抑制剂α-萘黄酮和CYP2D1特异性抑制剂奎尼丁对柠檬苦素的代谢也有不同程度的抑制作用。结论: 柠檬苦素在大鼠肝微粒体中代谢存在明显的性别差异,CYP3A2和 CYP2C11 在雌雄大鼠肝微粒体中的性别差异可能是引起代谢性别差异的主要原因。

关键词: 柠檬苦素, 肝微粒体, CYP450, 药代动力学, 性别差异

Abstract: AIM: To study the gender difference of limonin metabolism and the effects of selective CYP450 inhibitors on the metabolism of limonin in rat liver microsomes.METHODS: Limonin was incubated in rat liver microsomes, the enzyme kinetics parameters were studied; the metabolism of gender differences of limonin in male and female rat liver microsomes were compared; four kinds of CYP450 subtype specificity inhibitors were incubated with liver microsomes, the metabolic inhibition of inhibitors of limonin were calculated.RESULTS: The optimal incubation time was 30 min and the optimal enzyme concentration was 2.0 mg/mL. Km of limonin in female and male rat liver microsomes are (12±3) and (16±4) μg/mL and Vmax are (49±6) and (93±14) ng·min-1·mg-1. The metabolic percentage are (33.9±4.7)% and (53.8±2.8)% and metabolic rate are(4.46±0.62)and (7.08±0.37) ng·min-1·mg-1 respectively in famle and male rat liver microsomes. Inparticularly Ketoconazole(Ket) and Cimetidine (Cime) had significant inhibitory effects on the metabolism of limonin. It was further found that α-Naphthoflavone (α-Naph) and Quinidine (Quin) had little effects on the metabolism of limonin.CONCLUSION: The gender difference of limonin metabolism in rat liver microsomes has been investigated in this study, and the CYP3A2 and CYP2C11 may be the main reason for the sex difference.

Key words: limonin, liver microsome, CYP450, pharmacokinetics, gender difference

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