基于PARP1信号通路研究芒柄花素对糖氧剥夺/复氧复糖神经元细胞损伤的影响

The effect of formononetin on the neuron cell damage of oxygen-glucose deprivation/reoxygenation was studied based on the PARP1 signaling pathway

目的 基于PARP1信号通路研究芒柄花素对糖氧剥夺/复氧复糖神经元细胞损伤的影响,为揭示运用锦鸡儿异黄酮治疗脑缺血再灌注损伤提供理论依据。方法 建立小鼠神经元细胞(HT22)糖氧剥夺/复氧复糖(OGD/R)模型,通过Western blot检测糖氧剥夺/复氧复糖不同时间HT22神经元细胞中PARP1和PARG表达情况,选择通路变化最佳时间点。分别使用芒柄花素、PARP1抑制剂(PJ34)和PARG抑制剂处理OGD/R后的HT22细胞,设置6个组,分别为对照组、对照组+芒柄花素组、OGD/R组、OGD/R+芒柄花素组、OGD/R+PJ34组、OGD/R+PARG抑制剂组。对照组HT22细胞正常培养,不进行OGD/R处理;采用免疫荧光、Western blot法检测各组细胞凋亡因子、相关蛋白表达水平。结果 在糖氧剥夺/复氧复糖3 h后,HT22细胞中PARP1通路激活最明显,在OGD/R 3 h条件下,芒柄花素、PJ34或PARG抑制剂处理后可提高E3泛素连接酶(Iduna),抑制PARP1、PARG通路蛋白表达,并降低AIF和P53表达,提高AKT蛋白磷酸化水平。结论 HT22小鼠神经元细胞在OGD/R条件下,芒柄花素可通过提高Iduna蛋白表达抑制PARP1/AIF/Akt信号通路减轻HT22小鼠神经元细胞损伤。

Objective To study the effect of formononetin on the cell damage of glucose/oxygen deprivation/reoxygenation glyconeurons via the PARP1 signaling pathway,and to offer theoretical support for the use of Caragana isoflavones in the treatment of cerebral ischemia-reperfusion injury.Methods In mouse neurons(HT22),a model of Oxygen-glucose deprivation/reoxygenation(OGD/R) was created.Western blot was used to detect the expression of PARP1 and PARG in HT22 neurons at various time points of glucose-oxygen deprivation/reoxygenation,and the optimal time point of pathway modification was chosen.After OGD/R,HT22 cells were treated with formononetin,PARP1 inhibitor(PJ34),and PARG inhibitor,and six groups were developed:control group,control group+formononetin group,OGD/R group,OGD/R+ formononetin group,OGD/R+PJ34 group,OGD/R+PARG inhibitor group.HT22 cells were grown normally without OGD/R therapy in the control group.The expression levels of apoptotic factors and associated proteins in each group were determined using immunofluorescence and Western blot.Results PARP1 pathway was activated most obviously in HT22 cells after 3 hours of glucose and oxygen deprivation/reoxygenation.Under the condition of OGD/R 3 h,treatment with formononetin,PJ34 or PARG inhibitor could increase E3 ubiquitin ligase(Iduna),inhibit the expression of PARP1 and PARG pathway proteins,reduce the expression of AIF and P53,and increase the phosphorylation level of AKT protein.Conclusion Formononetin can block the PARP1/AIF/Akt signaling pathway by raising the expression of Iduna protein in the presence of OGD/R,hence decreasing the damage to HT22 mouse neurons.