银杏叶提取物对缺血再灌注鼠脑保护作用的研究

目的探讨中药银杏叶提取物对鼠缺血再灌注脑损伤的脑保护作用。方法采用磁共振成像与波谱技术分别对缺血再灌注组及银杏叶提取物组鼠脑组织缺血、水肿及N-乙酰天门冬氨酸(NAA)与乳酸(Lac)等代谢产物变化进行观察和比较。结果在缺血60min再灌注1h、3h、6h银杏叶提取物均能减小高信号区的体积,有效减少脑缺血后Lac/磷酸肌酸和肌酸(PCr Cr)比值的上升和NAA/(PCr Cr)比值的下降,与缺血再灌注组相比较差异有极显著性(均P<0·01)。结论银杏叶提取物具有显著的缺血后脑保护作用;磁共振成像与波谱技术可为缺血再灌注后中药脑保护剂作用机制的研究提供精确的神经影像学信息。

Study of protective effect of Ginkgo Biloba extract on rat brain with cerebral ischemia/reperfusion

Objective To observe the protective effect of Chinese traditional medicine Ginkgo Biloba extract on rat brain with cerebral ischemia/reperfusion.Methods Compared with ischemia/reperfusion group, Ginkgo Biloba extract-treated group was observed the change of ischemia and edema volume and NAA and lactate in by DWI and ~1H-MRS examination after cerebral ischemia /reperfusion 1 h,3 h,6 h. Results A significant reductions in infarct volume were found in the Ginkgo Biloba extract-treated group compared with the control group after cerebral ischemia 60 min/reperfusion 1 h,3 h,6 h. Ginkgo Biloba extract could decrease the concentration of Lac/(PCr Cr) and prevent the decline of the concentration of NAA /(PCr Cr) after cerebral ischemia/reperfusion, it had significantly difference compared with the control group(all P< 0.01). Conclusions Ginkgo Biloba extract showed remarkable neuroprotective effect after cerebral ischemia. ~1H-MRS and MRI could offer exact neuroimaging information on studying the neuroprotective meachnism of Chinese traditional medicine after cerebral ischemia and reperfusion.