CYCLIN DEPENDENT KINASE INHIBITOR IN ACUTE RENAL FAILURE

本申请是针对细胞周期蛋白p21的研究。 急性肾功能衰竭中的依赖性激酶抑制物。《校长》 研究人员发现，在三种不同类型的急性肾脏中 损伤，即缺血再灌注，顺铂给药，以及 输尿管梗阻，对肾脏有快速而深刻的诱导作用 P21的小管，一种细胞周期蛋白依赖的激酶抑制物，它有 对细胞命运的多效性影响，包括细胞周期中断， 诱导细胞衰老、终末分化和 对再生的抑制。首席调查员提供 有证据表明p21在急性肾功能衰竭中可能起到保护作用。 这一观点是基于使用p21空鼠标进行的研究 顺铂肾毒性。野生型p21小鼠与 P21基因缺失小鼠的坏死和细胞凋亡明显减少， 组织学损伤更小，肾功能保存更好 同时，急性肾功能衰竭的死亡率也较低。在野外 型小鼠，近端肾小管坏死主要累及S3段 而在p21缺失的小鼠中，这种坏死已经扩展到所有 细分市场。P21的诱导不仅在顺铂中观察到 模型，但也在缺血再灌注损伤以及尿路 障碍物。在顺铂模型中，也有强烈的诱导 P53，这一发现在其他模型中没有观察到。因为P53是 已知包括p21，主要研究人员假设肾脏 损伤本身，在某些情况下，还伴随着P53的诱导 正如在顺铂肾病中发生的那样，代表着对 肾损伤。这种p21的诱导对肾脏有保护作用。 损伤，因为它阻止细胞从G1期进展到 S阶段。防止从G1到S的进展允许 发生修复性反应，使受损细胞进入 脱氧核糖核酸进入S期的情况没有发生。在后一种情况下，当 细胞进入S期导致p21缺失 未修复和未修复引起的细胞坏死和细胞凋亡 DNA受损。由这种DNA损伤导致的细胞死亡 导致相应的增殖性反应。因此，在本质上，p21， 同时防止增殖和细胞死亡，这是更明显的 在p21空鼠标中。

This application is directed towards the study of p21, a cyclin- dependent kinase inhibitor in acute renal failure. The Principal Investigator has found that in three different types of acute renal injury, namely, ischemia reperfusion, cisplatin administration, and ureteral obstruction, there is rapid and profound induction in renal tubules of p21, a cyclin-dependent kinase inhibitor, which has pleiotropic effects on cell fate, including cell-cycle interruption, induction of cellular senescence, termination differentiation and inhibition of regeneration. The Principal Investigator provides evidence that p21 may serve a protective role in acute renal failure. This view is based on studies using a p21 null mouse subjected to cisplatin nephrotoxicity. The wild type p21 mouse as compared to the p21 null mouse demonstrated markedly reduced necrosis and apoptosis, less histologic injury and greater preservation of renal function in conjunction with less mortality from acute renal failure. In the wild type mouse, proximal tubular necrosis mainly involved the S3 segment whereas in the p21 null mouse, such necrosis had extended through all segments. The induction of p21 is observed not only in the cisplatin model, but also in ischemia reperfusion injury as well as urinary tract obstruction. In the cisplatin model, there is also intense induction of p53, a finding that is not observed in the other models. Since p53 is known to include p21, the principal investigator hypothesizes that renal injury per se, and in some instances, complemented by induction of p53 as occurs in cisplatin nephropathy, represents an adaptive response to renal injury. This induction of p21 has a protective effect in renal injury since it prevents the progression of cells from the G1 phase to the S phase. That prevention of progression from G1 to S allow reparative responses to occur such that the entry of cells with damaged DNA into the S phase does not occur. In the latter circumstance, when there is an absence of p21 the entry of cells into the S phase leads to the induction of necrosis and apoptosis because of unrepaired and damaged DNA. The cell death resulting from such DNA injury in turn leads to a commensurate proliferative response. Thus, p21, in essence, prevents both the proliferation and cell death which is more manifest in the p21 null mouse.