【摘要】 目的:探讨大黄素对缺糖/缺氧小胶质细胞的保护作用及机制。方法:建立缺糖/缺氧小胶质细胞模型;给予大黄素(20、40和80μmol/L)和/或过表达TLR4质粒(pcDNA-TLR4)对细胞进行干预;MTT法检测细胞活力;ELISA实验检测细胞上清液中乳酸脱氢酶(LDH)和肿瘤坏死因子α(TNF-α)的含量;流式细胞术检测细胞凋亡;Western blot检测细胞中Bax、Bcl-2、TLR4、p-IκB和IκB的蛋白水平。结果:与DMSO处理的缺糖/缺氧组相比,大黄素处理的缺糖/缺氧小胶质细胞的活力显著升高,LDH和TNF-α的含量、细胞凋亡率及Bax、TLR4、p-IκB的蛋白水平均显著降低,Bcl-2的蛋白水平显著升高(P<0.05);过表达TLR4可抑制大黄素处理的缺糖/缺氧小胶质细胞的细胞活力并增加其凋亡率。结论:大黄素对缺糖/缺氧诱导的小胶质细胞具有保护作用,其机制可能与TLR4/NF-κB信号通路失活有关。更多还原

【Abstract】 AIM: To investigate the mechanism of emodin on the protection of glucose-deficient/anoxic microglia. METHODS: A microglia BV2 cell model induced by hypoglycemia/hypoxia(HH) was established. The glucose-deficient/anoxic cells treated with emodin were labeled as HH+emodin(20, 40 and 80 μmol/L) groups. The BV2 cells with TLR4 over-expression treated with emodin under hypoglycemia/hypoxia condition was labeled as HH+pcDNA-TLR4+ emodin(40 μmol/L) group. The cell viability was measured by MTT assay. Lactate dehydrogenase(LDH) and tumor necrosis factor-α(TNF-α) levels were detected by ELISA. The apoptosis was analyzed by flow cytometry. The protein levels of Bax, Bcl-2, TLR4, p-IκB and IκB were determined by Western blot. RESULTS: Compared with HH+DMSO group, the viability was significantly increased, the levels of LDH and TNF-α and apoptotic rate were significantly decreased, the protein levels of Bax, TLR4 and p-IκB were significantly decreased, the protein level of Bcl-2 was significantly increased in HH+emodin groups(P<0.05). Over-expression of TLR4 reversed the effect of emodin on promoting the viability and inhibiting apoptosis in the BV2 cells. CONCLUSION: Emodin has a protective effect on hypoglycemia/hypoxia induced microglia, and its mechanism may be related to the inactivation of TLR4/NF-κB signaling pathway.更多还原