Gadd45b在缺血性腦卒中和卒中后腦可塑性中的作用
[Abstract]:AIM: Growth arrest and DNA-damage inducible protein beta (Gadd45b) belongs to the Gadd45 family and has been proved to be associated with neuronal activity, which is closely related to neurogenesis. Neuronal apoptosis may be associated with axonal plasticity and post-stroke rehabilitation. Cell death patterns include apoptosis, autophagy and necrosis. Autophagic cell death, as a type II programmed cell death, has been shown to be involved in the pathological process of cerebral ischemia-reperfusion injury. However, the role of Gadd45b in autophagy is not apparent during this pathological process. In addition, Gadd45b can promote the expression of brain derived neurotrophic factor (BDNF) in cerebral ischemia, which is related to the plasticity of axons. Gadd45b may play a role in promoting rehabilitation in cerebral ischemia. Ubiquitin-proteasome system (UPS) regulates the degradation of intracellular proteins extensively. Gadd45 expression is regulated by ubiquitination. However, how the expression of Gadd45b is induced by cerebral ischemia-reperfusion injury and the specific mechanisms involved are unclear. This study aims to further explore and analyze the role of UPS in cerebral ischemia-reperfusion injury. Methods: Rat cortical neurons were primary cultured and treated with oxygen-glucose deprivation and reperfusion (og). D / r, i.e. ogd3h and reperfusion 0h, 6h, 24h, 48h, 72h and 120h. CCK-8 and LDH kits were used to detect the activity and damage of cortical neurons. lentivirus shrna-gadd45b was constructed to silence the expression of gadd45b, and autophagy (atg5, lc3, beclin-1, atg7, atg3), apoptotic pathway molecules (bax, bcl-2, cleaspase 3, p53) were detected by Western blotting. At the same time, autophagy inhibitors or JNK / p38 pathway inhibitors were given to detect the expression of related molecules, and TUNEL technique was used to detect the apoptosis of cortical neurons. In addition, the expression of huwe1 was silenced by lentivirus shrna-huwe1, the interaction between huwe1 and Gadd45b was detected by co-ip, the stability of Gadd45b was analyzed by CHX treatment, the methylation of bdnfixa by huwe1 and Gadd45b was detected by bsp, and the effect of huwe1 and Gadd45b on BDNF and BDNF was detected by Western blot. Results: After treatment with OGD / r, the activity of cortical neurons decreased gradually with the prolongation of reperfusion time. The expression of Gadd45b was the highest at 24 hours of OGD / r24. After silencing Gadd45b with lentivirus shrna, the expression of Gadd45b was significantly decreased and increased at 24 hours of reperfusion. The autophagy pathway signaling molecules (beclin-1, atg5, Atg7 and atg3), the ratio of lc3ii / lc3i and the expression of apoptotic proteins Bax and cleavedcaspase 3 were decreased, but the expression of anti-apoptotic proteins Bcl-2 was decreased. At the same time, the co-treatment of lentivirus shRNA-Gadd45b and autophagy pathway inhibitor 3-MA or Wortmannin partially inhibited the ratio of LC3 II / LC3 I. After silencing the expression of Gadd45b, the phosphorylation level of p-p38 in the autophagy-related pathway decreased, while that of p-JNK in the apoptosis-related pathway increased. Co-treatment with lentivirus shRNA-Gadd45b and p38 pathway inhibitors significantly induced autophagy, whereas co-treatment with lentivirus shRNA-Gadd45b and JNK pathway inhibitors induced autophagy. After 24 hours of OGD/R, the expression of Gadd45b and BDNF was significantly increased after Huwe1 was silenced. CO-IP results showed that Huwe1 interacted with Gadd45b. After CHX treatment, the expression of endogenous Gadd45b was inhibited, while the expression of Gadd45b was increased after CHX and lentivirus shRNA-Huwe1 co-treatment. After treatment, the expression of BDNF and downstream effector molecule was decreased, while the expression of BDNF and downstream effector molecule was increased after treatment with lentivirus shRNA-Huwe1. After silencing Huwe1 expression, the methylation level of the fifth CpG island of BDNF-IXa was decreased, while after silencing Gadd45b expression, the methylation level of the fourth CpG island of BDNF-IXa was increased. Gadd45b regulates apoptosis and autophagy in the pathological process of R. The expression of Gadd45b is regulated by the ubiquitin-proteasome system Huwe1. Gadd45b and Huwe1 mediate the methylation of BDNF IXa.
【學(xué)位授予單位】:重慶醫(yī)科大學(xué)
【學(xué)位級(jí)別】:博士
【學(xué)位授予年份】:2016
【分類號(hào)】:R743.3
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