单侧输尿管梗阻的大鼠内质网应激相关蛋白表达上调

摘要

Objective To explore the endoplasmic reticulum stress (ERS) apoptosis pathway in unilateral ureteral obstruction (UUO) mechanism of renal interstitial fibrosis in rats.Methods The rats were randomly divided into con-trol group and model group,UUO group line ligation of the left ureter,three days 3,7 and 14 days HE and Masson staining were used to observe the renal pathological changes;Take blood retinal venous plexus,separat and determina-tion of serum blood urea nitrogen and creatinine;Western blot was used to find protein 78 (GRP78) glucose regula-tion,endoplasmic reticulum source sex transcription factor (CHOP) and apoptosis related proteins cysteine aspartic acid proteinase 3(caspase-3) and caspase-12 protein expression. Results Compared with control group,the visible UUO model group 1) expansion of renal tubule and renal interstitial fibrosis degree with the extension of ureteral ob-struction time and progressive increase;2) GRP78,CHOP,caspase-3 and caspase-12 protein expression in postoper-ative 3 d have to rise,as the obstruction prolonged,the protein expression more significantly(P<0.01).Conclusions Endoplasmic reticulum stress related trademark protein in UUO rat renal interstitial fibrosis is the increase in expres-sion may promote the early renal interstitial fibrosis and continuous progress.%目的 探究内质网应激(ERS)相关凋亡通路在单侧输尿管梗阻(UUO)大鼠肾间质纤维化中的作用机制.方法 将大鼠随机分为假手术组及UUO模型组,UUO组行左侧输尿管结扎术,于术后3、7和14 d HE和Masson染色观察肾脏病理变化;眼底静脉丛取血,分离血清测定血尿素氮及肌酐;Western blot 检测葡萄糖调节蛋白78 (GRP78)、内质网源性转录因子(CHOP)、凋亡相关蛋白半胱氨酸天门冬氨酸蛋白酶3(caspase-3)及caspase-12蛋白表达.结果 与假手术组相比,UUO模型组可见:1)肾小管扩张和肾间质纤维化程度随输尿管梗阻时间延长而渐进性加重;2)GRP78、CHOP、caspase-3及caspase-12蛋白表达在术后3 d均有上调,随着梗阻时间延长,上述蛋白表达更显著(P<0.01).结论 内质网应激相关标志性蛋白在UUO大鼠肾间质纤维化的早期即存在表达上调,可能促进了肾间质纤维化不断进展.