银杏总内酯在脑缺血损伤模型大鼠体内的PK-PD研究

目的基于药效学-药动学(PK-PD)结合模型探索银杏总内酯在脑缺血损伤模型大鼠体内的代谢过程。方法通过线栓法建立大鼠大脑中动脉局灶性栓塞(MCAO)模型,再灌注后分别以鼻腔、ig和尾iv给予银杏总内酯溶液,于给药后0.25、0.33、0.5、0.75、1.0、1.25、1.5、2.0、4.0、6.0、9.0、12.0 h眼眶取血,利用LC-MS测定血浆中银杏内酯B的质量浓度,绘制药-时曲线;通过试剂盒测定血清中超氧化物歧化酶(SOD)、丙二醛(MDA)的量,绘制时-效曲线;采用DAS2.0软件计算药动学参数并拟合PK-PD结合模型。结果给药组大鼠体内中银杏内酯B的消除半衰期(t_(1/2))均较小,鼻腔给药组大鼠的药时曲线下面积(AUC)明显高于ig组和尾iv组。结论银杏内酯B对缺血性脑卒中疾病有良好的保护和缓解作用,鼻腔给药方式较iv和ig方式更具有药动学优势,可以为研发银杏内酯B的鼻腔给药制剂提供参考。

Study on pharmacokinetics and pharmacodynamics of ginkgolides in rat model with cerebral ischemia injury

Objective To study the metabolic process of ginkgolides in rats with cerebral ischemic injury based on pharmacokinetic-pharmacodynamics (PK-PD) binding model. Methods The middle cerebral artery occlusion (MCAO) model was established by the suture method. After reperfusion, rats were randomly assigned to nasal administration, ig administration, and iv administration group.The orbital blood was taken at different time points of 0.25, 0.33, 0.5, 0.75, 1.0, 1.25, 1.5, 2.0, 4.0, 6.0, 9.0, and 12.0 h after the administration of the ginkgolides solution. The drug-time curve of ginkgolide B in plasma were drawn according to the concentration measured by LC-MS. The time-effect curve of superoxide dismutase (SOD) and malondialdehyde (MDA) were drawn based on the value measured by the kit. The pharmacokinetic parameters were calculated by DAS 2.0 software to fit the PK-PD binding model. Results The t_1/2 of ginkgolide B of the rats in the administration group was smaller than that in the MCAO model group. The area under the curve (AUC) of nasal administration was significantly higher than intragastric administration and intravenous administration. Conclusion Ginkgolide B has a good protective and mitigating effect on ischemic stroke. The pharmacokinetics of nasal administration is better than iv and ig administration, which can provide reference for the development of nasal administration of ginkgolide B.