Abstract
p53 is a key modulator of cellular stress responses. It is activated in the ischemic areas of brain, and contributes to neuronal apoptosis. In various stroke models, p53 deficiency or applications of p53 inhibitors can significantly attenuate brain damage. p53-mediated neuronal apoptosis occurs through various molecular mechanisms. The transcriptional pathway is an important mechanism through which p53 induces neuronal apoptosis by up-regulating the expression of its target gene p21WAF, Peg3/Pw1 or p53-up-regulated modulator of apoptosis (PUMA). In addition, p53 disrupts NF-κB binding to p300 and blocks NF-κB-mediated survival signaling. On the other hand, the transcription-independent pathway mechanism is also of great importance. In this pathway, p53 is translocated to mitochondrial and mediates the release of cytochrome c. In both pathways, p53 seems to play a key role in post-ischemic brain damage and has become a therapeutic target against stroke pathology.
Keywords: p53, cerebral ischemia, apoptosis
摘要
p53是调节细胞应激反应的关键因子。 脑缺血激活p53, 后者导致神经元凋亡。 对于多种动物中风模型的研究均表明, p53缺陷或p53抑制剂均能显著减轻脑损伤。 p53介导神经元凋亡的机制主要有两种, 包括转录依赖和转录非依赖途径。 在转录依赖途径中, p53通过上调其靶基因p21WAF, Peg3/Pw1或PUMA(受p53基因上调表达的凋亡调控基因)诱导神经元凋亡。 此外, p53还干预NF-κB与胸苷激酶p300的结合, 进而阻断NF-κB介导的生存信号。 在转录非依赖途径中, p53进入线粒体并介导细胞色素C的释放。 因此, p53有可能在缺血后脑损伤过程中起关键作用, 并有望成为脑中风药物治疗的靶点。
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