人参皂苷Rb1对大鼠胎鼠海马神经细胞凋亡的影响

目的：以原代培养的大鼠胎鼠海马神经细胞缺氧/缺糖再给氧为模型，观察人参皂苷Rb₁对神经细胞凋亡的抑制作用。方法：流式细胞术检测凋亡细胞百分率，荧光显微镜观察细胞形态学变化和坏死细胞百分率，同时，测定细胞LDH的释放和NO的产生量。结果：神经细胞缺氧/缺糖5 h后再给氧可诱导神经细胞凋亡和细胞坏死，并显著增加LDH的释放和NO的产生，并随再给氧时间的延长而增加。人参皂苷Rb₁能降低神经细胞凋亡及坏死的百分率，减少LDH的释放和NO的过量产生，人参皂苷Rb₁的作用随剂量增加而作用增加。结论：人参皂苷Rb₁具有拮抗海马神经细胞凋亡的作用，这种作用可能与降低或抑制NOS活性，减少NO的过量产生有关。

Effect of Ginsenoside Rb1 on apoptosis induced by hypoxia/hypoglycemia

AIM: The aim of this work is to investigate the protective effects of Ginsenoside Rb 1(Rb 1) on apoptosis induced by hypoxia /hypoglycemia and reoxygenation in cultured rat hippocampal neurons. METHODS: Apoptosis were measured by flow cytometry; Morphological changes and neuronal necrosis were examined under microscope; The leakage of lactic dehydrogenase(LDH) and the product of nitric oxide(NO) were measured. RESULTS: hypoxia /hypoglycemia cultures for 5 h and reoxygenation induced neuronal apoptosis and necrosis,and significantly increased the leakage of LDH and the product of NO. The effects were enhanced with the extending time of reoxygenation. Rb 1 could significantly decrease the percentage of neuronal apoptosis and necrosis, and reduce the leakage of LDH and the product of NO. CONCLUSION: Rb 1 had an effect of anti-neuronal apoptosis. This effect might be related to the inhibition of the activity of NO synthase and NO production.