补骨脂素和异补骨脂素在大鼠和人肝微粒体的酶促动力学
发布时间:2019-06-13 09:15
【摘要】:目的研究中药有效成分补骨脂素和异补骨脂素的细胞色素P450(CYP)酶促动力学特征,比较其结构和种属差异,为体内药代动力学特征的预测提供科学依据。方法建立补骨脂素和异补骨脂素的液相色谱串联质谱(LC-MS/MS)检测方法,在优化人和大鼠肝微粒体孵育体系和评价体外代谢稳定性的基础上,进行了代谢稳定性和酶促动力学研究,应用非线性回归法计算最大反应速率(V_(max))和米氏常数(K_m)。结果应用建立的LC-MS/MS检测方法,补骨脂素、异补骨脂素在肝微粒体孵育液中定量范围为0.1~50.0μmol·L~(-1),线性关系良好,精密度和准确度等满足检测要求。体外代谢稳定性研究显示,当底物浓度为1μmol·L~(-1),蛋白浓度为0.5 g·L~(-1),孵育40 min内,补骨脂素和异补骨脂素在大鼠和人肝微粒体呈线性消除,体外半衰期分别为74.5,95.0,74.5和173.3 min。补骨脂素在大鼠和人肝微粒体中的V_(max)分别为:(1.140±0.080)μmol·min-1·g-1蛋白,(0.620±0.060)μmol·min-1·g-1蛋白;K_m分别为(12.9±0.3)μmol·L~(-1)和(7.4±1.3)μmol·L~(-1)。异补骨脂素在大鼠和人肝微粒体中的V_(max)分别为(0.251±0.012)μmol·min-1·g-1蛋白和(0.103±0.014)μmol·min-1·g-1蛋白;K_m分别为:(3.0±0.4)μmol·L~(-1)和(3.4±0.7)μmol·L~(-1)。结论补骨脂素和异补骨脂素的CYP酶促动力学特征及代谢稳定性具有一定的种属和结构差异,在大鼠两者基于CYP酶的代谢清除过程可能相似。而在人体,异补骨脂素的CYP代谢清除可能慢于补骨脂素,导致药代动力学特征的差异。
[Abstract]:Objective to study the enzyme kinetic characteristics of pigment P450 (CYP) of psoralen and isopsoralen, and to compare their structure and species differences, so as to provide scientific basis for the prediction of pharmacokinetics characteristics in vivo. Methods A liquid chromatography tandem mass spectrometry (LC-MS/MS) method for the determination of psoralen and isopsoralen was established. On the basis of optimizing the incubation system of human and rat liver microsomes and evaluating the metabolic stability in vitro, the metabolic stability and enzyme kinetics were studied. The maximum reaction rates (V _ (max) and K 鈮,
本文编号:2498422
[Abstract]:Objective to study the enzyme kinetic characteristics of pigment P450 (CYP) of psoralen and isopsoralen, and to compare their structure and species differences, so as to provide scientific basis for the prediction of pharmacokinetics characteristics in vivo. Methods A liquid chromatography tandem mass spectrometry (LC-MS/MS) method for the determination of psoralen and isopsoralen was established. On the basis of optimizing the incubation system of human and rat liver microsomes and evaluating the metabolic stability in vitro, the metabolic stability and enzyme kinetics were studied. The maximum reaction rates (V _ (max) and K 鈮,
本文编号:2498422
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