mitoTEMPO通过调控线粒体自噬对慢性肾脏病模型大鼠足细胞损伤的保护作用研究  

Study on the Protective Effect of mitoTEMPO on Podocyte Injury in Rat Models with Chronic Kidney Disease by Modulating Mitochondrial Autophagy

作　　者：王若霜 冷彦飞[1] 袁飞远[1] WANG Ruoshuang;LENG Yanfei;YUAN Feiyuan(Department of Nephrology,the First People's Hospital of Liangshan Yi Autonomous Prefecture,Sichuan Liangshan 615000,China)

机构地区：[1]凉山彝族自治州第一人民医院肾病科,四川凉山615000

出　　处：《现代检验医学杂志》2024年第5期22-29,共8页Journal of Modern Laboratory Medicine

基　　金：四川省卫生健康科研课题(课题编号:19PJ302)。

摘　　要：目的 探讨线粒体靶向的2, 2, 6, 6-四甲基哌啶-1-氧基-4-氨基-2-氧基乙基(mitochondria-targeted 2, 2, 6, 6-tetramethylpiperidin-1-oxyl-4-amino-2-oxyethl,mitoTEMPO)对慢性肾脏病(chronic kidney disease,CKD)模型大鼠足细胞损伤的影响及其相关分子机制。方法 18只健康SD大鼠随机分为对照(Control)组、模型组(CKD组)和mitoTEMPO组,每组6只。采用全自动生化分析仪测定肾功能;苏木素-伊红染色检测肾病理结构;免疫组织化学法检测肾脏肌间质蛋白(desmin)和足突蛋白(podocin)表达;透射电镜检测足细胞超微结构;免疫荧光共染检测足细胞线粒体自噬;实时荧光定量PCR检测肾脏炎性因子表达;蛋白免疫印迹法检测Nod样受体家族成员蛋白3(nod-like receptor protein 3,NLRP3)炎症小体,自噬和帕金蛋白(Parkin)/PTEN诱导假定激酶1(PTEN induced putative kinase1,PINK1)通路相关蛋白表达。结果 与Control组比较,CKD组大鼠24h尿蛋白(84.89±8.98 mg/24h vs 5.79±1.39mg/24h),血清肌酐(serum creatinine,Scr)(75.10±10.46μmol/L vs 38.57±4.89μmol/L),尿素氮(urea nitrogen,BUN)(8.96±1.07 mmol/L vs 2.73±0.43mmol/L)水平升高,差异具有统计学意义(t=21.322,7.749,13.233,均P<0.001);肾小球体积增大、系膜增生、大量炎性细胞浸润;足细胞足突融合,基底膜增厚,线粒体嵴断裂和空泡化;desmin阳性区增多,podocin阳性区减少,差异具有统计学意义(t=9.903,7.651,均P<0.001);p62和desmin可见共定位;LC3 II/I,PINK1和Parkin蛋白表达降低(t=16.984,15.105,11.390),IL-1β,TNF-α,NLRP3,cleaved caspase-1和p62蛋白表达升高(t=5.700~21.571),差异具有统计学意义(均P<0.001)。与CKD组比较,mitoTEMPO组24h尿蛋白、Scr和BUN水平降低,差异具有统计学意义(t=12.508,4.712,7.338,均P<0.001);肾脏病理损伤和足细胞情况显著改善;desmin阳性区减少,podocin阳性区增多(t=6.649,7.686,均P<0.001);LC3和COX IV可见共定位;LC3 II/I,PINK1和Parkin蛋白表达升高(t=15.481,20.469,5.801),IL-1β,TNF-α,NLObjective To investigate the effect of mitochondria-targeted 2,2,6,6-tetramethylpiperidin-1-oxyl-4-ylamino(mitoTEMPO)on podocyte injury in rat models with chronic kidney disease(CKD)and its related molecular mechanisms.Methods A total of 18 healthy SD rats were randomly divided into control group,model group(CKD group),and mitoTEMPO group,with 6 rats in each group.Renal function was measured by a fully automated biochemical analyzer,and hematoxylin eosin staining was used to detect renal pathological structure.Immunohistochemical staining was used to detect the expression of desmin and podocin in the renal muscle.Transmission electron microscopy was used to detect the ultrastructure of foot cells.Immunofluorescence co staining was used to detect mitochondrial autophagy in podocytes.Real time fluorescence quantitative PCR was used to detect the expression of renal inflammatory factors.Protein immunoblotting was used to detect the expression of Nod-like receptor protein 3(NLRP3)inflammatory bodies,autophagy,and Parkin/PTEN induced putative kinase 1(PINK1)pathway related proteins.Results Compared with the control group,the levels of 24h urinary protein(84.89±8.98 mg/24h vs 5.79±1.39 mg/24h),serum creatinine(Scr)(75.10±10.46μmol/L vs 38.57±4.89μmol/L)and blood urea nitrogen(BUN)(8.96±1.07 mmol/L vs 2.73±0.43mmol/L)in CKD group were increased,with significant differences(t=21.322,7.749,13.233,all P<0.001).The CKD group showed an increase in glomerular volume,mesangial proliferation,and extensive infiltration of inflammatory cells in rats.The foot processes of podocytes in the CKD group were fused,the basement membrane was thickened,and mitochondrial cristae were fractured and vacuolated.Compared with the control group,the positive area of desmin in the CKD group was increased,while the positive area of podocin was decreased,with significant differences(t=9.903,7.651,all P<0.001).Meanwhile,p62 and desmin were co-localized in the CKD group.In addition,the protein expressions of LC3 II/I,PINK1 and Parkin in the C

关 键 词：线粒体靶向的2 2 6 6-四甲基哌啶-1-氧基-4-氨基-2-氧基乙基 慢性肾脏病 足细胞损伤 PINK1/Parkin信号通路 Nod样受体家族成员蛋白3炎症小体 

分 类 号：R-332[医药卫生]