NOX4/TRPC6在糖尿病肾病足细胞损伤中的作用  

Role of NOX4/TRPC6 in podocyte injury during diabetic nephropathy

作　　者：岳汝驰 李惠敏 胡斌[2] 宋志霞[1] YUE Ruchi;LI Huimin;HU Bin;SONG Zhixia(The First Clinical Medical College of China Three Gorges University,Yichang Central People's Hospital,Yichang 443000,China;Department of Nephrology,Renhe Hospital Affiliated to China Three Gorges University,Yichang 443000,China)

机构地区：[1]三峡大学第一临床医学院,宜昌市中心人民医院,湖北宜昌443000 [2]三峡大学附属仁和医院肾内科,湖北宜昌443000

出　　处：《中国病理生理杂志》2025年第2期250-260,共11页Chinese Journal of Pathophysiology

基　　金：湖北省自然科学基金资助项目(No.2021CFB379);宜昌市医疗卫生项目专项基金资助项目(No.A21-2-002)。

摘　　要：目的:探讨NADPH氧化酶4(NADPH oxidase 4,NOX4)/瞬时受体电位阳离子通道C亚家族成员6(transient receptor potential channel subfamily C member 6,TRPC6)在糖尿病肾病足细胞损伤中的作用及其机制。方法:(1)将雄性Sprague-Dawley大鼠随机分为对照组、糖尿病肾病组、NOX4抑制剂(GKT137831)组、糖尿病肾病+GKTl37831组,每组8~10只。通过一次性腹腔注射链脲佐菌素(streptozotocin,STZ)(70 mg/kg)构建1型糖尿病模型,模型构建成功后腹腔注射GKT137831(5 mg/kg)。定期监测血糖和24 h尿白蛋白定量,并收集血液及肾脏组织。(2)使用小鼠肾小球足细胞为体外实验研究对象,细胞分为正常对照组、高糖组、GKTl37831组及高糖+GKTl37831组。体外高糖培养足细胞2周。使用NOX4抑制剂及使用小干扰RNA(small interfering RNA,siRNA)转染足细胞。免疫印迹、免疫组化及实时荧光反转录PCR(reverse transcription polymerase chain reaction,RT-qPCR)等技术检测NOX4和TRPC6表达水平。(3)使用荧光共聚焦显微镜观察高糖条件下足细胞线粒体形态变化,通过免疫印迹法检测足细胞中过氧化物酶体增殖物激活受体γ共激活因子1α(peroxisome proliferator-activated receptor gamma coactivator 1α,PGC1α)、线粒体转录因子A(mitochondrial transcription factor A,TFAM)、细胞色素C氧化酶亚单位I(cytochrome C oxidase subunit I,COX I)和COX IV蛋白表达水平。结果:(1)与正常对照组相比,糖尿病肾病大鼠肾小球显著肥大、基底膜增厚,系膜区增宽,尿白蛋白定量显著增加,免疫印迹及免疫组化结果显示肾组织NOX4蛋白表达水平升高,肾小球足细胞蛋白(nephrin)表达减少,间质细胞标志物如结蛋白(desmin)表达增加,TRPC6表达水平升高(P<0.05);使用GKT137831可降低肾组织desmin表达,保留肾小球nephrin,减少尿白蛋白定量(P<0.05)。(2)在体外足细胞实验中,高糖背景下,足细胞中NOX4和TRPC6表达上调(P<0.05);免疫荧光及免疫印迹检测结果显示AIM:To investigate the role and underlying mechanisms of NADPH oxidase 4(NOX4)/transient receptor potential channel subfamily C member 6(TRPC6)in the context of podocyte damage in diabetic nephropathya comprehensive investigative study was warranted.METHODS:(1)Male Sprague-Dawley rats were randomly divided into four distinct groups:a control group,a diabetic nephropathy group,a NOX4 inhibitor GKT137831-treated group,and a combined diabetic nephropathy with NOX4 inhibitor GKT137831-treated group,each consisting of 8~10 rats.The type 1 diabetes mellitus model was constructed via a single intraperitoneal injection of streptozotocin(STZ)(70 mg/kg),subse-quent to the successful induction of the model,GKT137831(at the dose of 5 mg/kg)was administered intraperitoneally.Regular monitoring of blood glucose levels was conducted,and urinary albumin excretion was quantified after 24 hours.Moreover,blood and kidney tissues were harvested for further analysis.(2)Mouse glomerular podocytes were divided into four distinct groups:a normal control group,a high glucose group,a GKT137831-treated group and a high glucose GKT137831-treated group.These podocytes were subsequently cultivated in vitro under high glucose conditions for 2 weeks.Thereafter,transfection of podocytes was carried out using NOX4 inhibitors and short interfering RNA targeting(siRNA)TRPC6.To detect the expression levels of NOX4 and TRPC6,a battery of techniques including Western blot,Immunohistochemistry,and reverse transcription polymerase chain reaction(RT-qPCR)were employed.(3)The morpho-logical changes of podocyte mitochondria under the condition of high glucose were observed by fluorescence confocal mi-croscopy,and the expression levels of peroxisome proliferator-activated receptor gamma coactivator 1α(PGC1α),mito-chondrial transcription factor A(TFAM),cytochromec oxidase subunit I(COX I)and cytochromec oxidase subunit IV(COX IV)in podocytes were assessed utilizing the Western blot technique.RESULTS:(1)Compared with normal con-trol group,mice with diabetic

关 键 词：糖尿病肾病 足细胞损伤 NADPH氧化酶4 瞬时受体电位阳离子通道C亚家族成员6 

分 类 号：R587.1[医药卫生—内分泌] R363.2[医药卫生—内科学] Q291[医药卫生—临床医学]