【摘要】 目的:研究灵芝提取物(GLE)对原代大鼠皮层神经元氧糖剥夺-再复氧(OGD/R)损伤模型的影响,在细胞水平探讨GLE神经保护作用的机制。方法:新生SD大鼠的皮层神经元原代培养至第7d,用GLE预处理神经元OGD/R模型。选取OGD/R后的0h、3h、6h、12h、24h、48h和72h作为观察点,观察GLE干预后对各个时点的细胞形态学、细胞毒作用、细胞线粒体活性、细胞凋亡率及凋亡相关蛋白表达量的影响。结果:GLE(0.1、1、10mg/L)能明显减少神经元LDH的释放,提高线粒体活性。流式细胞术结果证实了GLE能抑制神经元OGD/R损伤导致的凋亡,这种作用甚至能持续至OGD/R后的72h。GLE(0.1、1、10mg/L)下调caspase-3、caspase-8蛋白的表达,GLE(10mg/L)还能下调caspase-9蛋白表达。结论:GLE对OGD/R诱导的神经元损伤有一定的保护作用,可能是有效防治急性缺血性卒中的神经保护药物。更多还原

【Abstract】 AIM:To investigate the neuroprotective effect of Ganoderma lucidum extract (GLE) in an in vitro model of primary cultured neurons with oxygen and glucose deprivation (OGD). METHODS: Neuronal injury was induced by oxygen and glucose deprivation/reoxygenation (OGD/R). The neuronal injury and viability were determined by LDH leakage and XTT assay at 0 h,3 h,6 h,12 h,24 h,48 h and 72 h after OGD/R. Neuronal apoptosis was detected by flow cytometry (FCM). The expression of apoptosis-related proteins was analyzed by Western blotting.RESULTS: The viability of the neurons increased with exposure to GLE (0.1 mg/L,1 mg/L and 10 mg/L)after OGD/R. The LDH releases were also significantly reduced. GLE significantly inhibited OGD/R-induced apoptosis of cultured rat cortical neurons in a concentration-dependent and time-dependent manner(P<0.05). GLE at concentrations of 0.1 mg/L,1 mg/L and 10 mg/L inhibited the expression of caspase-3 and caspase-8 proenzyme. Additionally,GLE at concentration of 10 mg/L suppressed the expression of caspase-9 proenzyme.CONCLUSION: Our findings provide the evidence that the GLE has neuroprotective effect on cerebral ischemia. The mechanisms are related to the inhibition of caspase-3,-8 and-9 activations. GLE may be a novel and effective reagent for treating ischemic stroke.更多还原