亞鐵離子對星形膠質(zhì)細胞的損傷作用及香芹酚在實驗性腦出血中的神經(jīng)保護作用
[Abstract]:Related studies have shown that ferrous ions have toxic effects on neuroepithelial cells. However, it is not clear whether ferrous ions can cause toxic damage to astrocytes by changing the expression of aquaporin 4 (AQP4) in astrocytes. It has also been reported that carvonol plays an important neuroprotective role in central nervous system diseases. So far, however, there has been little research on whether carvonol has the same neuroprotective effect in hemorrhagic stroke. In this study, the injury model of primary cultured astrocytes induced by ferrous ions and the model of intracerebral hemorrhage induced by collagenase were used to investigate the mechanism of the toxicity of ferrous ions and the neuroprotective effect of carvingol. We used the primary cultured astrocyte injury model induced by ferrous ions to detect the viability of Cell Counting Kit8 cells to verify the damage effect of ferrous ions on astrocytes. Real time RT-PCR and Western Blot were used to detect the changes of AQP4 expression after the action of ferrous ions, and Western Blot was used to detect the effect of ferrous ions on the expression of signal proteins in the mitogen-activated protein kinase (mitogen-activated protein kinases, MAPKs) pathway. After blocking the oxidative stress reaction of ferrous ions, the effect of ferrous ions on the expression of AQP4 was detected. We used the model of astrocyte injury induced by ferrous ions to verify the protective effect of carvingol on astrocytes. Using collagenase-induced cerebral hemorrhage model in mice, we measured and evaluated the behavioral indexes, brain edema, (BBB) damage of blood-brain barrier, AQP4 mRNA expression and AQP4 protein expression. To verify the neuroprotective effect of carvingol. The results showed that in primary astrocytes cultured in vitro, the death of astrocytes increased with the increase of the concentration of ferrous ions, and increased with the prolongation of the action time of ferrous ions. At the same time, the expression of AQP4 gene and protein were increased in astrocytes, and the expression of phosphorylated p38, phosphorylated ERK and phosphorylated JNK were also up-regulated. The expression of AQP4 protein in astrocytes decreased after antioxidants blocked the oxidative stress induced by ferrous ions. In the primary astrocytes cultured in vitro, the death of astrocytes decreased and the expression of AQP4 protein in astrocytes decreased after the treatment of ferrous ions and carvingol. In the model of intracerebral hemorrhage induced by collagenase injection, the nerve function of the mice was improved after the treatment of carvingol, and the water content and BBB dysfunction of the injured brain tissue were obviously alleviated. At the same time, the expression of AQP4 gene and protein were down-regulated. In conclusion, ferrous ions have obvious damage on primary cultured astrocytes, which may be due to the up-regulation of AQP4 expression in astrocytes through the activation of MAPK pathway by oxidative stress. Carvingol has a protective effect on astrocytes injured by ferrous ions, and its mechanism may be by inhibiting the overexpression of AQP4. Carvonol has a protective effect on the neurological function of mice after intracerebral hemorrhage, and its mechanism may be to reduce the vasogenic brain edema by inhibiting the overexpression of AQP4.
【學位授予單位】:上海交通大學
【學位級別】:博士
【學位授予年份】:2014
【分類號】:R743.34
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