塔克林第一阶段生物转化和相关的肝毒性:一种可能的方法,以避免子甲基的形成
Martin Novak1,2, Marie Vajrychova2, Stefania Koutsilieri3
1Department of Pharmaceutical Chemistry and Pharmaceutical Analysis, Faculty of Pharmacy in Hradec Kralove, Charles University, Heyrovskeho 1203, 50005 Hradec Kralove, Czech Republic.
以前与7-OH-tacrine代谢物相关的塔克林肝毒性,可能不遵循金甲基机制. 三维人肝细胞培养揭示了7-OH-tacrine是毒性最小的衍生物,挑战了之前的假设.
科学领域:
- 药理学 药理学是指药理学的学科.
- 肝病学 肝病学是一种肝病学.
- 药用化学 医学化学
背景情况:
- 阿尔茨海默氏症药物塔克林因肝损伤而被撤销,疑似由7-OH-塔克林代谢物形成甲基 (Qmeth) 引起.
- 了解塔克林生物转化和毒性机制对于开发更安全的衍生品至关重要.
研究的目的:
- 为了确定最准确的体外模型来研究太克林诱导的肝损伤.
- 为了研究塔克林及其7替代类型的肝毒性.
- 设计具有降低Qmeth形成潜力的新型塔克林衍生物.
主要方法:
- 在动物模型 (小鼠,老鼠) 和人体体内实验室系统 (肝脏显微体,原发性肝细胞,3D PHH球体) 中对膜生物转化和毒性的比较.
- 分析塔克林及其类型 (7-甲基,7-基和7-OH-塔克林) 的代谢和细胞毒性.
- 使用人类肝脏显微体和3D PHH球体检测Qmeth-添加物 (氨酸,谷氨酸).
主要成果:
- 动物模型没有准确地模仿人类的甲代谢;小鼠模型比大鼠模型更适合.
- 主要人类肝细胞 (PHHs) 的三维球形培养物最好地复制了膜生物转化.
- 令人惊的是,7-OH-tacrine表现出最低的肝毒性,与假设的Qmeth机制相反.
- 在人类肝脏显微体中观察到Qmeth-adduct形成,但在3D PHH球体中没有,这质疑了已建立的毒性途径.
结论:
- 通过Qmeth形成诱导的肌性肝损伤的确定的机制是有问题的.
- 三维PHH球形培养物代表了研究膜肝毒性的合适模型.
- 这些发现为通过合理的化学修饰开发更安全的塔克林衍生物开辟了新的途径.
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