慢性移植肾肾病模型中骨桥蛋白、α平滑肌肌动蛋白和E钙黏蛋白的表达

目的 观察骨桥蛋白(OPN)、α平滑肌肌动蛋白(α-SMA)、E钙黏蛋白在大鼠慢性移植肾肾病(CAN)模型移植肾中的表达及其表达的相关性.方法 以Fisher大鼠为供者,Lewis大鼠为受者,进行原位异体肾移植(CAN组);以供、受者均为Lewis大鼠的肾移植模型作为对照.术后12周处死受者,取血、尿样本检测移植肾功能,取移植肾进行HE染色和天狼星红染色,观察其组织形态学变化.采用免疫组织化学法和免疫印迹法观察移植肾组织OPN、α-SMA和E钙黏蛋白的表达.结果 CAN组大鼠移植肾组织形态学符合CAN的病理改变.免疫组化结果显示,与对照组相比较,CAN组肾小管上皮及肾间质中OPN和α-SMA的表达增强,而CAN组小管上皮E钙黏蛋白的表达明显下降.免疫印迹结果与免疫组化结果一致,CAN组移植肾组织中OPN和α-SMA的表达相对灰度值分别为85.74±2.29和88.79±4.44,对照组分别为14.25±0.71、11.21±0.56,两组间的差异有统计学意义(P＜0.05).CAN组E钙黏蛋白的相对灰度值为24.96±0.02,对照组为75.04±3.21,两组间的差异有统计学意义(P＜0.05).两组大鼠移植肾OPN的表达量与α-SMA的表达量呈正相关(r=0.746,P＜0.05),与E钙黏蛋白的表达量呈负相关(r=-0.526,P＜0.05).结论 CAN大鼠移植肾中OPN的表达增加,OPN可能参与了移植肾肾小管上皮细胞向间充质细胞转化的过程.

Abstract：

Objective To investigate the expression of OPN, α-SMA, E-cadherin and their correlation in the chronic allograft nephropathy (CAN) rat model, and to explore the possible role of OPN in CAN.Methods Orthotopic renal-transplantation using Fisher rats as donors and Lewis rats as recipients was done to establish CAN group, and Lewis to Lewis rats as control group. Rats in each group were sacrificed 12 weeks after the surgery. Blood and urine were collected for further test. Allograft samples were collected and sectioned for HE, Sirus-red staining, immunohistochemistry and Western blot.Results There were CAN morphological changes of the allograft in CAN group. As compared with control group, immunohistochemistry and Western blot revealed that the expression of OPN and α-SMA in CAN group was significantly increased, and that of E-Cadherin reduced. Its trend was correlated with the inflammatory response and the EMT of tubule epithelial cells.Conclusions OPN expression in rat CAN model is significantly up-regulated. OPN may play a role in CAN. OPN might affect the CAN by promoting EMT of tubule epithelial cells.

Expression of Osteopontin and molecules in EMT of rats with chronic allograft nephropathy

Objective To investigate the expression of OPN, α-SMA, E-cadherin and their correlation in the chronic allograft nephropathy (CAN) rat model, and to explore the possible role of OPN in CAN.Methods Orthotopic renal-transplantation using Fisher rats as donors and Lewis rats as recipients was done to establish CAN group, and Lewis to Lewis rats as control group. Rats in each group were sacrificed 12 weeks after the surgery. Blood and urine were collected for further test. Allograft samples were collected and sectioned for HE, Sirus-red staining, immunohistochemistry and Western blot.Results There were CAN morphological changes of the allograft in CAN group. As compared with control group, immunohistochemistry and Western blot revealed that the expression of OPN and α-SMA in CAN group was significantly increased, and that of E-Cadherin reduced. Its trend was correlated with the inflammatory response and the EMT of tubule epithelial cells.Conclusions OPN expression in rat CAN model is significantly up-regulated. OPN may play a role in CAN. OPN might affect the CAN by promoting EMT of tubule epithelial cells.