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We have found that Batroxobin plays a protactive role in ischemic brain injury, which attracted us to investigate the effect of Batroxobin on apoptosis of neurons during cerebral ischemia and reperfusion. The apoptotic cells in ischemic rat brains at different reperfusion intervals were tested with method of TdT-mediated dUTP-DIG nick end labeling (TUNEL) and the effect of Batroxobin on the apoptosis of neurons was studied in left middle cerebral artery (LMCA) occlusion and reperfusion in rat models (n=18). The results showed that few scattered apoptosis cells were observed in right cerebral hemispheres after LMCA occlusion and reperfusion, and that a lot of apoptosis cells were found in left ischemic cortex and caudoputamen at 12h reperfusion, and they reached peak at 24h~48h reperfusion. However, in the rats pretreated with Batroxobin, the number of apoptosis cells in left cerebral cortex and caudoputamen reduced significantly and the neuronal damage was much milder at 24h reperfusion than that of saline-treated rats. The results indicate that administration of Batroxobin may reduce the apoptosis of neurons induced by cerebral ischemia and reperfusion and afford significant cerebroprotection in the model of focal cerebral ischemia and reperfusion.
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We have found that Batroxobin plays a protactive role in ischemic brain injury, which attracted us to investigate the effect of Batroxobin on apoptosis of neurons during cerebral ischemia and reperfusion. The apoptotic cells in ischemic rat brains at different reperfusion intervals were tested with method of TdT-mediated dUTP-DIG nick end labeling (TUNEL) and the effect of Batroxobin on the apoptosis of neurons was studied in left middle cerebral artery (LMCA) occlusion and reperfusion in rat models (n=18). The results showed that few scattered apoptosis cells were observed in right cerebral hemispheres after LMCA occlusion and reperfusion, and that a lot of apoptosis cells were found in left ischemic cortex and caudoputamen at 12h reperfusion, and they reached peak at 24h~48h reperfusion. However, in the rats pretreated with Batroxobin, the number of apoptosis cells in left cerebral cortex and caudoputamen reduced significantly and the neuronal damage was much milder at 24h reperfusion than that of saline-treated rats. The results indicate that administration of Batroxobin may reduce the apoptosis of neurons induced by cerebral ischemia and reperfusion and afford significant cerebroprotection in the model of focal cerebral ischemia and reperfusion.
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大鼠脑缺血再灌注后降钙素基因相关肽对受损胃黏膜的保护作用
The purpose of the present study is to investigate the protective effect of calcitonin gene-related pepfide (CGRP) on gastric mucosa injury after focal cerebral ischemia reperfusion and gastric ischemia-reperfusion in rats. Wistar male rats (280-320g) were selected for this experiment. Focal cerebral ischemia and reperfusion rat model was established with left middle cerebral artery occlusion by using thread inserting.
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局灶性脑缺血再灌注信号转导子与转录激活子-3激活与MR扩散加权成像的实验研究
缺血性脑血管病占脑血管疾病的80%[1],其中以大脑中动脉分布区的发病率高.MRI可以反映缺血后脑组织的病理生理变化,但是MRI变化是否与缺血后脑组织的分子生物学变化存在关系有待研究.信号转导与转录激活子( signal transducer and activator of transcription, STAT)是一类DNA结合蛋白,参与细胞生长、恶性转化、凋亡等生理功能的调节[2],磷酸化STAT3(P-STAT3)是STAT3的活化状态.本实验结合急性脑缺血再灌注后STAT3的激活和DWI状况进行研究,探讨脑缺血再灌注分子机制,为进一步研究脑缺血后的治疗提供理论基础.
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局灶性脑缺血再灌注后大鼠脑皮质caspase-3,bcl-2的表达
既往大量研究证明, 脑缺血再灌注(ischemia and reperfusion,IR)后神经元死亡有坏死和凋亡两种形式.坏死是不可逆的,而凋亡早期是可逆的,所以神经元凋亡的研究成为热点.神经元凋亡发生发展过程中,caspase家族、bcl-2家族起了重要作用.caspase-3被认为是caspase家族中细胞凋亡关键的效应蛋白酶,它的激活很大程度上依赖细胞色素C从线粒体释放入胞质[1].bcl-2是bcl-2家族中抑制凋亡的代表,与bax或bid促凋亡基因形成异源二聚体,通过调控细胞色素C在线粒体膜的释放调控凋亡[1].本文通过局灶性脑缺血再灌注(focal cerebral ischemia and reperfusion,FCIR)损伤动物模型,观察caspase-3,bcl-2在SD大鼠FCIR损伤后大脑皮质的时相免疫表达,用TUNEL法即寡核苷酸末端脱氧核糖核酸转移酶(TdT)介导的dUTP缺口末端标记法检测细胞凋亡时相变化,探讨凋亡过程中二者与凋亡的相互关系,为阐明凋亡的机制及IR损伤的防治提供实验依据.
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自由基损害与红细胞免疫功能状态对急性脑血管病预后的影响
Background: Recent studies show free radicals play an important role in pathogenesis of brain infarction. Over formation of free radicals damage neurons primarily and secondly. A series of free radical reaction accounts from the most part during generation and necrosis due to brain ischemia and reperfusion. Changes in free radicals and immunological state of red cells will affect prognosis in patients with cerebral infarction.
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Myocardial ischemia and reperfusion-induced cell death depends on JNK activation and leads to phosphorylation of mitochondrial p46
Multiple signaling pathways, including the c-Jun N-terminal kinase (JNK) pathway, are activated in myocardial ischemia and reperfusion (MI/R) and correlate with cell death. However, the role of the JNK pathway with respect to protection or destruction in MI/R-induced cell death is poorly understood. In a rabbit model, we found that ischemia followed by reperfusion resulted in JNK activation which could be detected in cytosol as well as in mitochondria. To address the functional role of the JNK activation, we examined the consequences of blockade of JNK activation in isolated cardiomyocytes under conditions of simulated ischemia. The JNK activity was stimulated ~6-fold by simulated ischemia and reperfusion (simulated MI). When a dominant negative mutant of JNK kinase-2(dnJNKK2), an upstream regulator of JNK, and JNK-interacting protein-1 (JIP-1) were expressed in myocytes by recombinant adenovirus, the activation of JNK by simulated MI was reduced 53%. Furthermore, the TNFα-activated JNK activity in H9c2 cells was completely abolished by dnJNKK2 and JIP-1. In correlation, when dnJNKK2 and JIP-1 were expressed in cardiomyocytes, both constructs significantly reduced cell death after simulated MI compared to vector controls.