EPO在大鼠缺血再灌注急性腎損傷模型中對內(nèi)質(zhì)網(wǎng)應(yīng)激的影響
[Abstract]:Background: acute renal failure (ARF) is characterized by acute renal function change, one of the main causes is acute renal tubular injury (ART), which is one of the common clinical diseases with high overall mortality. At present, support or replacement therapy is the main cause. Erythropoietin (Erythropoietin, EPO) promotes erythrocyte survival, proliferation and differentiation by binding EPO receptor (EPOR), on erythroid cell surface. In recent years, EPOR. has been found on the surface of nerve cells, cardiomyocytes and renal tubular epithelial cells. It is found that EPO has some therapeutic effects on cerebral ischemia and myocardial infarction. In recent years, more and more studies on the role of EPO in renal ischemia-reperfusion have been carried out. The protective mechanism of EPO may be the activation of JAK2 downstream anti-apoptosis pathway. Endoplasmic reticulum stress (Endoplasmic reticulum stress,ERS) is a common response of tissue cells to external stimuli at the subcellular level. The initiation of PERK,ATF6 and IRE1 signaling pathway mainly through unfolded protein response (Unfolded protein response,UPR) may have two sides and play an early role in cell protection. In the late stage, apoptosis was promoted by CHOP,JNK and Caspase12. Objective: to investigate the protective effect of EPO on acute renal injury induced by ischemia and reperfusion and the effect of EPO on endoplasmic reticulum stress and systemic inflammatory factors. Methods: 104 male SD rats with 300-350 g were randomly divided into three groups. According to the intervention conditions, they were divided into three groups: sham operation saline group (Sham NS,n=20), sham operation administration group (Sham EPO,n=20), ischemia reperfusion saline group (IR NS,n=32) and ischemia-reperfusion administration group (IR EPO,n=32). There were 5 rats in sham operation group and 8 rats in ischemia reperfusion group at each reperfusion time point. EPO or NS. were given in groups 2 hours before surgery. In the true operation group, bilateral renal pedicles were subjected to reperfusion after 90 minutes of ischemia. The blood and kidney tissues of inferior vena cava were collected and killed after reperfusion for 6 and 24 hours. The laboratory assists in the detection of serum creatinine and urea nitrogen in venous blood. HE was performed in the right kidney, CHOP, was detected by immunohistochemistry, and serum MCP-1,IL-1 尾 -IL-6 and TNF- 偽 were measured by ELISA. Results: (1) compared with Sham NS group, the levels of SCr and BUN in IR NS group increased significantly at 1 hour after reperfusion (P0. 001), and gradually increased with the prolongation of reperfusion time. The levels of SCr,BUN, CHOP, MCP-1,IL-1 尾, IL-6 and TNF- 偽 were decreased compared with those of normal saline control group. Compared with IR NS group, the SCr,CHOP of IR EPO group had statistical significance at 3 hours and 24 hours after reperfusion (P0.05). (P0.05) there was no significant difference between ischemia reperfusion group and sham operation group in CHOP at 24 hours after reperfusion (P0.05). (3). There was significant difference between IR NS group and Sham NS group in 3h and 24h reperfusion group (P0.05) conclusion: (1) Ischemia-reperfusion injury caused significant damage to renal tissue and renal function in rats. (2) after EPO preconditioning, there was significant damage to renal tissue and renal function in rats. (3) acute ischemia-reperfusion could induce endoplasmic reticulum stress to down-regulate the level of ERS marker CHOP. The renal protective effect of EPO may be related to the inhibition of ERS, which needs further study.
【學(xué)位授予單位】:北京協(xié)和醫(yī)學(xué)院
【學(xué)位級別】:博士
【學(xué)位授予年份】:2010
【分類號】:R-332;R692.5
【共引文獻】
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