肾小管上皮细胞线粒体氧化损伤在肾间质纤维化中的作用及机制

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肾小管上皮细胞线粒体氧化损伤在肾间质纤维化中的作用及机制

[摘要] 目的探讨肾小管上皮细胞线粒体氧化损伤在肾间质纤维化中的作用机制。方法 2015年6~12月期间,于本地动物实验中心选取60只健康雄性大鼠,根据处理方法的不同将其分为实验组和对照组,其中实验组行左侧输尿管结扎术,对照组则仅接受左侧输尿管游离,14 d后对两组大鼠的左侧肾脏中线粒体相关基因的表达情况、肾脏功能等参数进行检测分析。结果实验组大鼠术后14 d mtDNA(1.49±0.12)、NRF1(1.87±0.17)、PGC1a(1.76±0.21)、Drp1(2.49±0.24)、Mfn2(2.45±0.27)的表达水平均明显高于对照组(1.07±0.23、1.11±0.29、1.05±0.32、1.14±0.35、1.17±0.14),差异具有统计学意义(P<0.05);术后14 d,实验组大鼠肾脏组织中的COX(2.61±0.27)明显高于对照组的(1.07±0.19),SOD较对照组明显降低(0.55±0.16 vs 1.07±0.18),其RIF指数(22.76±1.39)明显高于对照组的(0.81±0.16),差异具有统计学意义(P<0.05)。结论在肾间质纤维化中肾小管上皮细胞线粒体氧化损伤发挥着十分重要的作用,缺氧所造成的线粒体氧化损伤会造成肾小管功能受损,引起大量致纤维因子的产生,并从多途径引起肾间质纤维化。

[关键词] 肾间质纤维化;肾小管上皮细胞;线粒体氧化损伤;肾小管功能

[中图分类号] R692 [文献标识码] A [文章编号] 1673-9701(2016)20-0032-03

[Abstract] Objective To discuss the effect and mechanism of mitochondria oxidative damage in renal tubular epithelial cells on renal interstitial fibrosis. Methods A total of 60 health male rats were selected from a local animal experimental center from June to December 2015 and divided into study group and control group. Rats in the study group were given left ureteral obstruction,while those in the control group were only given left ureteral mobilization. Parameters including the expression of genes in mitochondria and renal function of the left kidney were detected and analyzed after 14 days. Results At 14 d after surgery, the expression levels of mtDNA (1.49±0.12), regenerating gene (1.87±0.17),interrupted gene(1.76±0.21), and fusion gene(2.49±0.24, 2.45±0.27)in the study group were all significantly higher than those(1.07±0.23, 1.11±0.29,1.05±0.32, 1.14±0.35, and 1.17±0.14) in the control group(P<0.05). The level of COX (2.61±0.27) in kidney

tissues in the study group was significantly higher than that(1.07±0.19) in the control group, while the level of SOD was significantly lower than the control group(0.55±0.16 vs 1.07±0.18). The RIF index (22.76±1.39) in the study group was significantly higher than that (0.81±0.16)in the control group (P<0.05). Conclusion Mitochondria oxidative damage in renal tubular epithelial cells has a significant effect on renal interstitial fibrosis. Mitochondria oxidative damage caused by anoxia may lead to functional impairment of kidney tubules,inducing a large number of fibrosis factors and resulting in renal interstitial fibrosis from multiple pathways.

[Key words] Renal interstitial fibrosis;Renal tubular epithelial cell; Mitochondria oxidative damage;Renal tubular function

绝大部分慢性肾脏疾病均存在肾间质纤维化表现,如间质细胞外基质和小管基底膜成分出现定量及定性改变、肌纤维母细胞聚集、肾小管萎缩等[1]。目前大量研究均指出,在肾小管基膜破坏过程中,患者多存在肾小管上皮细胞转化为肌纤维母细胞样细胞现象,继而引起间质区出现大量细胞外基质(engine control module,ECM)沉积,引发肾小管萎缩,最终造成间质纤维化病损[2,3]。本次研究在2015年6~12月期间通过建立

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