摘要
目的:明确清肾颗粒(QSG)通过微小RNA-4516(miR-4516)/SIAH3/PINK1调节线粒体自噬而减轻大鼠肾纤维化的作用机制.方法:将雄性SD大鼠随机分为3组,包括正常组、模型组和QSG组,每组10只,予QSG水溶液灌胃,每天1次,每次4 mL,连续给药8周.检测各组大鼠血肌酐水平;苏木精-伊红(HE)和Masson染色检测各组大鼠肾脏病理损伤程度;Werstern blot检测各组大鼠肾脏组织中β-actin、PINK1、Parkin、SIAH3、VDAC1、Mfn1、Mfn2、OPA1、LC3B和P62蛋白表达水平;RT-qPCR检测大鼠肾脏组织中SIAH3的mRNA表达水平;透射电镜观察肾脏组织中线粒体损伤情况.制备QSG含药血清,转化生长因子β1(TGF-β1)诱导HK-2细胞纤维化模型,细胞分为:正常对照(NC)组、模型(MC)组、MC+miR-4516 mimics组、MC+miR-4516 NC+QSG组、MC+miR-4516 mimics+QSG组和MC+QSG组.CCK-8法检测各组细胞活力;Western blot检测各组细胞中E-cadherin和α-SMA蛋白表达水平;双萤光素酶报告基因实验验证miR-4516对SIAH3的调节;RT-qPCR检测miR-4516、SIAH3 mRNA和PINK1 mRNA的表达.结果:与模型组比较,QSG干预后大鼠肾组织及HK-2细胞纤维化减轻,SIAH3的mRNA表达水平显著降低(P<0.05),PINK1表达水平显著升高(P<0.05),肾组织自噬活跃,体外结果证实QSG可以提高miR-4516的表达水平,抑制SIAH3的mRNA表达进而促进HK-2细胞中PINK1表达,降低纤维化标志蛋白α-SMA蛋白的表达水平.结论:QSG可通过干预miR-4516水平而靶向调节SIAH3/PINK1轴,增强线粒体自噬,从而延缓大鼠肾纤维化的进展.
Abstract
AIM:To explore the mechanism by which Qingshen granules(QSG)intervene in the microRNA-4516(miR-4516)targeted regulation of the SIAH3/PINK1 axis,enhancing mitophagy and inhibiting renal fibrosis.METHODS:Male SD rats were randomly divided into three groups:control,model,and QSG groups.The QSG aqueous solution was administered via gavage once daily,4 mL each time,for 8 consecutive weeks.Blood creatinine levels were measured in each group.Hematoxylin-eosin(HE)and Masson staining were utilized to assess the degree of renal patholog-ical damage.Western blot analysis was performed to determine the expression levels of β-actin,PINK1,Parkin,SIAH3,VDAC1,Mfn1,Mfn2,OPA1,LC3B,and P62 proteins in renal tissue.RT-qPCR was used to detect the mRNA expres-sion level of SIAH3 in rat kidney tissue,and transmission electron microscopy was employed to observe mitochondrial dam-age in renal tissue.QSG-containing serum and transforming growth factor-β1(TGF-β1)were used to induce an HK-2 cell fibrosis model.The cells were divided into the following groups:normal cell(NC)group,model cell(MC)group,MC+miR-4516 mimics group,MC+miR-4516 NC+QSG group,MC+miR-4516 mimics+QSG group,and MC+QSG group.Cell activity in each group was detected using the CCK-8 method,and Western blot analysis was performed to determine E-cad-herin and α-SMA protein expression levels.The regulation of SIAH3 by miR-4516 was verified using a dual luciferase re-porter assay.RT-qPCR was used to detect the mRNA expression of miR-4516,SIAH3 mRNA,and PINK1.RESULTS:The results indicated that QSG intervention reduced fibrosis in rat renal tissue and HK-2 cells,decreased SIAH3 mRNA expression,increased PINK1 expression,and activated mitophagy in renal tissue.In vitro results confirmed that QSG can elevate miR-4516 expression,inhibit SIAH3 mRNA expression,promote PINK1 expression in HK-2 cells,and reduce the expression of the fibrosis marker protein α-SMA.CONCLUSION:In summary,this study preliminarily clarified the mechanism by which QSG intervention targets miR-4516 to regulate the SIAH3/PINK1 axis,thereby enhancing mitophagy and inhibiting renal fibrosis.
基金项目
安徽省高等学校科学研究重点项目(KJ2021A0545)
安徽省高等学校科学研究重点项目(2023AH050749)
安徽省自然科学基金(2208085MH269)
临床医学研究转化专项(2022)(202104j07020014)
国家科技期刊平台
NSTL
万方数据