目的:研究蜂胶总黄酮(total flavonoids of propolis,TFP)对全脑缺血-再灌注大鼠神经元损伤的保护作用,并初步探讨其作用机制。方法:采用四血管阻断法制备大鼠全脑缺血-再灌注模型。HE染色法观察神经胶质细胞病理学变化;TUNEL法检测海马...目的:研究蜂胶总黄酮(total flavonoids of propolis,TFP)对全脑缺血-再灌注大鼠神经元损伤的保护作用,并初步探讨其作用机制。方法:采用四血管阻断法制备大鼠全脑缺血-再灌注模型。HE染色法观察神经胶质细胞病理学变化;TUNEL法检测海马CA1区神经细胞凋亡情况;免疫组织化学法检测BCL-2、BAX蛋白的表达,并计算BCL-2/BAX比值。结果:与假手术组比较,模型组大鼠大脑皮层内神经细胞凋亡数目和BAX、BCL-2蛋白表达均显著增高,BCL-2/BAX显著降低(P<0.01);与模型组比较,TFP能显著改善缺血-再灌注大鼠脑组织病理改变,减少神经细胞凋亡数目,上调BCL-2蛋白,下调BAX蛋白,提高BCL-2/BAX比值(P<0.01),其作用具有浓度依赖性。结论:TFP对全脑缺血-再灌注大鼠脑组织损伤具有良好的保护作用,其作用机制可能与减少大脑皮层神经细胞凋亡,调节与凋亡有关的调控因子的蛋白表达有关。展开更多
Cerebral ischemia seriously affects the quality of life and health of human worldwide.W026B is a newly synthesized lignan derivative that has a protective effect on the focal cerebral ischemia/reperfusion model,while ...Cerebral ischemia seriously affects the quality of life and health of human worldwide.W026B is a newly synthesized lignan derivative that has a protective effect on the focal cerebral ischemia/reperfusion model,while it is unclear whether W026B has a cerebral protective effect on the model of global cerebral ischemia/reperfusion(GCI/R).In this study,we investigated the protective effect of W026B on the four-vessel occlusion GCI/R model.The results showed that W026B obviously increased the survival rate of rats during 7 d after GCI/R and significantly improved neurological deficits within 7 d after GCI/R.It evidently enhanced the number of survival neurons in the hippocampus of GCI/R rats.Furthermore,W026B notably lowered the level of ROS,and increased the activity of SOD in the hippocampus of GCI/R rats.Moreover,it also decreased the expression of NF-κB p65 and the level of IL-6 apparently.In addition,W026B evidently lowered the activity of caspase-3.In conclusion,this study firstly proves that W026B has the protective effect on GCI/R rats.Its cerebral protective effect maybe related to the inhibition of oxidative stress,inflammatory response,and cell apoptosis during GCI/R.These results provide new evidence with the protective effect of W026B on cerebral ischemia/reperfusion injury.展开更多
文摘目的:研究蜂胶总黄酮(total flavonoids of propolis,TFP)对全脑缺血-再灌注大鼠神经元损伤的保护作用,并初步探讨其作用机制。方法:采用四血管阻断法制备大鼠全脑缺血-再灌注模型。HE染色法观察神经胶质细胞病理学变化;TUNEL法检测海马CA1区神经细胞凋亡情况;免疫组织化学法检测BCL-2、BAX蛋白的表达,并计算BCL-2/BAX比值。结果:与假手术组比较,模型组大鼠大脑皮层内神经细胞凋亡数目和BAX、BCL-2蛋白表达均显著增高,BCL-2/BAX显著降低(P<0.01);与模型组比较,TFP能显著改善缺血-再灌注大鼠脑组织病理改变,减少神经细胞凋亡数目,上调BCL-2蛋白,下调BAX蛋白,提高BCL-2/BAX比值(P<0.01),其作用具有浓度依赖性。结论:TFP对全脑缺血-再灌注大鼠脑组织损伤具有良好的保护作用,其作用机制可能与减少大脑皮层神经细胞凋亡,调节与凋亡有关的调控因子的蛋白表达有关。
基金National Natural Science Foundation of China(Grant No.81503060,81573333)R&D Foundation of Beijing Honghui New Medical Technology Co.,Ltd。
文摘Cerebral ischemia seriously affects the quality of life and health of human worldwide.W026B is a newly synthesized lignan derivative that has a protective effect on the focal cerebral ischemia/reperfusion model,while it is unclear whether W026B has a cerebral protective effect on the model of global cerebral ischemia/reperfusion(GCI/R).In this study,we investigated the protective effect of W026B on the four-vessel occlusion GCI/R model.The results showed that W026B obviously increased the survival rate of rats during 7 d after GCI/R and significantly improved neurological deficits within 7 d after GCI/R.It evidently enhanced the number of survival neurons in the hippocampus of GCI/R rats.Furthermore,W026B notably lowered the level of ROS,and increased the activity of SOD in the hippocampus of GCI/R rats.Moreover,it also decreased the expression of NF-κB p65 and the level of IL-6 apparently.In addition,W026B evidently lowered the activity of caspase-3.In conclusion,this study firstly proves that W026B has the protective effect on GCI/R rats.Its cerebral protective effect maybe related to the inhibition of oxidative stress,inflammatory response,and cell apoptosis during GCI/R.These results provide new evidence with the protective effect of W026B on cerebral ischemia/reperfusion injury.
