MG53對腦缺血再灌注損傷的保護(hù)作用及其機(jī)制研究
[Abstract]:BACKGROUND: Tissue injury induced by ischemia is the main cause of fatal diseases, such as stroke, myocardial infarction caused by coronary atherosclerosis and so on. Ischemic reperfusion injury occurs in traumatic shock, surgery, organ transplantation, burns, frostbite and thrombosis. Stroke has become the first cause of disability and death in China, and the incidence has been increasing year by year. Ischemic stroke is the most common type of stroke, accounting for about 70%, and the mortality rate is about 70%. In recent years, the role of Mitsugumin 53 (MG53) in the repair of cell membrane has attracted much attention. MG53 is a member of the triple domain protein family (Tripartite Motif P). Roein 72, TRIM72), a muscle-specific protein, contains TRIM and SPRY domains in its amino and carboxyl residues, mainly distributed in skeletal muscle and myocardial tissues, while few or no expression is found in other tissues. After injury, MG53 protein can transfer from the cytoplasm to the membrane under the action of extracellular calcium, and aggregate at the site of membrane breakage, seal the damaged membrane, and then play its protective role. For these mechanisms, calcium antagonists, gamma-aminobutyric acid receptor agonists, AMPA receptor antagonists, free radical scavengers and other drugs have been used in the treatment of brain IR, but no significant effect has been achieved. MG53 can directly target cell membrane repair and play its protective role, then, as a tissue organ with low or no MG53 protein expression (such as brain). Tissue), whether exogenous MG53 has protective effect? This study is to use the brain IR model of SD rats to study the protective effect of MG53 on cerebral ischemia-reperfusion by combining in vivo and in vitro experiments. The research includes: 1, the protective effect of MG53 on neurons; 2, the protective effect of rhMG53 on cerebral ischemia-reperfusion in SD rats. Protective effect of MG53 on cerebral ischemia-reperfusion injury through blood-brain barrier; 4. Signal pathway of rhMG53 on cerebral ischemia-reperfusion injury. Muscle and brain tissues of knockout mice and SD rats, and various brain tissue cell lines (microglia, astrocytes, neural stem cells, neurocytoma cells) were used as research objects. The expression of mg53 protein in brain tissues and fine tissues was verified by immunoblotting and immunohistochemistry, respectively. 2. The protective effects of mg53 on ischemia-reperfusion injury and hypoxia-reoxygenation injury of brain tissue and cells. We established focal cerebral ischemia-reperfusion injury in SD rats and mice by middle cerebral artery occlusion (mcao) using HT22 cells, a hippocampal neuronal cell line. The protective effects of mg53 on brain tissues and cells were analyzed by TTC staining, neurobehavioral score, pathological histology and LDH level. 3. Whether mg53 can enter the brain through blood-brain barrier during circulation can play a protective role in cerebral ischemia-reperfusion injury. We constructed mg53 transgenic mice and established cerebral ischemia-reperfusion model. The expression of mg53 in brain tissue was detected by Western blot. The protective effect of rhodamine dye-labeled rhmg53 protein was observed after cerebral ischemia-reperfusion injury in tpa-mg53 mice. Hmg53 and fitc-annexin V were used to validate the protective effect of rhmg53 through blood-brain barrier by IVIS and confocal laser scanning microscopy respectively. 4. rhmg53 played a protective role after brain injury. this part of the experiment used SD rats to establish cerebral ischemia-reperfusion model, divided into sham operation Group B, sham operation + rhmg 53, cerebral ischemia reperfusion group, cerebral ischemia reperfusion group + rhmg 53, brain tissue protein was extracted from the brain, and the key signals in the reperfusion injury rescue kinase (risk) pathway and (or) survival activating factor enhancement (safety) pathway were screened by immunoblotting. In the part of cell experiment, we used adenovirus to transfect gfp-mg53 protein into neural stem cells to make the nervous system more energetic. Mg53 protein was overexpressed by stem cells and damaged cell membrane by mechanical injury. the repairing effect of mg53 on cell membrane was observed. the main results were as follows: 1. there was no expression of mg53 protein in brain tissues and many kinds of brain tissues. the expression of mg53 protein in brain tissues was confirmed by immunoblotting and tissue immunofluorescence. No expression was found in the cell lines. 2. MG53 had protective effects on brain IR injury and neuronal cell injury. 2.1 In vivo, RH MG53 was found to reduce infarct size after cerebral ischemia-reperfusion injury in rats by TTC staining. HE staining of pathological tissues showed that rhMG53 could alleviate the pathological morphological changes of brain tissue, and it could be used in SD rats. Neurobehavioral score showed that rhMG53 could significantly improve the neurological signs after brain injury. 2.2 In vitro, rhMG53 could decrease the level of LDH after hypoxia/reoxygenation injury in neurons, suggesting that exogenous rhMG53 could protect neurons from hypoxia/reoxygenation injury. The protective effects of MG53 and exogenous rhMG53 on cerebral ischemia-reperfusion injury in t PA-MG53 transgenic mice were studied by blood-brain barrier. MG53 protein can repair the mechanical damage of neural stem cells. Adenovirus transfection of GFP-MG53 protein into neural stem cells increased the content of MG53 protein in the cells. It was found that MG53 had membrane repair effect on neural stem cells, and the effect of repairing neural cell membrane was dependent on redox reaction. At animal level, intravenous injection of RH MG53 protein can effectively activate RISK pathway, increase the phosphorylation levels of Akt and GSK3 beta, further inhibit the activity of apoptotic protein caspase 3, inhibit the apoptosis induced by reperfusion injury, and play a protective role in brain tissue. Conclusion: 1. There was no expression of MG53 protein in many kinds of brain tissues. 2. Rh MG53 could reduce the infarct size after cerebral ischemia-reperfusion injury in rats, and significantly improve the neurological signs after brain injury. At the same time, RH MG53 could play a protective role in hypoxia/reoxygenation injury of neurons. 3. MG53 and exogenous RH MG53 in circulation during cerebral ischemia-reperfusion injury. 4. MG53 has membrane repair effect on neural stem cells, and its effect on repairing neural cell membrane depends on redox reaction; rhMG53 increases Akt and GSK3 beta phosphorylation level by activating RISK pathway in the early stage of cerebral ischemia-reperfusion, and then inhibits Akt. Dependent caspase 3 proteins inhibit early apoptosis of brain cells and thus play a protective role in brain injury.
【學(xué)位授予單位】:第三軍醫(yī)大學(xué)
【學(xué)位級別】:博士
【學(xué)位授予年份】:2016
【分類號】:R743.3
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