钙调磷酸酶结合蛋白1在5/6肾切除大鼠肾小管上皮细胞损伤时高表达

摘要

Objective To investigate the role of Calcineurin binding protein 1(Cabin1)in renal tubular epithelial cells(RTECs)injury. Methods The male Sprague-Dawley rats were randomly divided into Sham-oper-ated and 5/6 nephrectomized group. Nephrectomized rats were further divided into two groups ,which were 4 and 8 weeks after operation,including 6 rats in each group. Rats were sacrificed at 4 or 8 weeks after nephrectomy,then control or remnant kidneys were harvested. 2μm sections of kidney tissues were collected and stained with Masson's trichrome and were graded for tubulointerstitial lesion score (TILS). RTECs mitochondrial morphology changes were detected by electron microscope. Western blot was applied to detect Cabin1 protein level in the renal tissue. Results At 8 weeks after the operation,plenty of RTECs fell off from the basement membrane,accompanied with interstitial fibrosis and the infiltration of inflammatory cells. Moreover ,TILS were significantly increased in rats at 8 weeks after operation while compared to sham-operated rats(7.16 ± 0.52 vs. 0.00 ± 0.00,P<0.05). RTECs mi-tochondria begun to swell at 4 weeks after 5/6 nephrectomy,while the disruption of cristae could be found in rats at 8 weeks. Cabin1 protein expression apparently increased in the remnant kidney. Cabin1 protein obviously increased in rats at 8 weeks after the surgery compared to sham-operated rats(0.97 ± 0.09 vs. 0.22 ± 0.07,P<0.05)and rats at 4 weeks after nephrectomy(0.97 ± 0.09 vs. 0.45 ± 0.03,P<0.05). Conclusions Cabin1 is overexpressed during RTECs injury in 5/6 nephrectomized rats. It can be a crucial factor regulating the damage of RTECs.%目的 探讨钙调磷酸酶结合蛋白1(calcineurin binding protein 1,Cabin1)在肾小管上皮细胞(renal tubular epithelial cells,RTECs)损伤中的作用.方法 雄性SD大鼠随机分成假手术组和5/6肾切除组,后者进一步分成术后4和8周组.肾切除后4和8周检杀大鼠,取肾组织行Masson染色和肾小管-间质损伤评分(tubulointerstitial lesion score,TILS),电镜观察RTECs线粒体形态,WB检测肾组织中Cabin1表达.结果 随造模时间延长,术后8周出现RTECs脱落、间质炎症细胞浸润及弥漫性纤维化;TILS逐渐升高,术后8周组与假手术组相比,差异具有统计学意义(7.16±0.52 vs.0.00±0.00,P<0.05).术后4周RTECs线粒体肿胀、形状不规则,术后8周出现线粒体膜、线粒体嵴结构模糊甚至消失.残肾中Cabin1蛋白表达明显升高,术后8周与假手术组(0.97±0.09 vs.0.22±0.07)、术后8周与4周组相比(0.97±0.09 vs.0.45±0.03),差异具有统计学意义(P<0.05).结论 Cabin1在RTECs损伤时高表达,其可能是调控RTECs损伤的重要靶点.