COMP与糖尿病肾病自噬相关性分析及其功能验证  

Correlation analysis of COMP and autophagy in diabetic nephropathy and its functional verification

作　　者：魏云鑫 蒋绪顺 蔡梦瑶 温睿智 杜晓刚[1] WEI Yunxin;JIANG Xushun;CAI Mengyao;WEN Ruizhi;DU Xiaogang(Department of Nephrology,First Affiliated Hospital of Chongqing Medical University,Chongqing 400016,China)

机构地区：[1]重庆医科大学附属第一医院肾脏病科,重庆400016

出　　处：《上海交通大学学报（医学版）》2024年第7期847-858,共12页Journal of Shanghai Jiao tong University:Medical Science

基　　金：国家自然科学基金(82200799);重庆市自然科学基金面上项目(cstc2019jcyj-msxmX0504)。

摘　　要：目的·通过研究高糖环境下肾小球足细胞中软骨寡聚基质蛋白(cartilage oligomeric matrix protein,COMP)与自噬的关系,进一步阐明在高糖环境下足细胞受损的可能机制。方法·从GENE EXPRESSION OMNIBUS(GEO)数据库下载基因表达数据集GSE104948,使用GEO2R筛选差异表达基因(differentially expressed gene,DEG),并对筛选出来的DEG进行富集分析。将加权基因共表达网络分析(Weighted Gene Co-Expression Network Analysis,WGCNA)与STRING数据库构建DEG的蛋白互作网络(protein protein interaction network,PPI)获得的相关性最高的关键基因(hub gene)取交集,并再次进行富集分析。体外培养条件永生性小鼠足细胞株,待其分化完全后,采用高糖刺激,Western blotting检测足细胞COMP、哺乳动物雷帕霉素靶蛋白(mammalian target of rapamycin,mTOR)、微管相关蛋白1A/1B-轻链3(microtubuleassociated protein 1 light chain3,LC3/MAP1LC3)等蛋白的表达。进一步通过抑制COMP的shRNA慢病毒载体感染足细胞以抑制COMP表达,并通过嘌呤霉素筛选稳定株,经Western blotting检测稳定株COMP、mTOR、LC3的表达,以观察COMP对自噬的影响。结果·共筛选出362个DEG进行后续分析。在这些DEG中,284个基因上调,78个基因下调。基因本体论(Gene Onotology,GO)术语分析结果显示,糖尿病肾病(diabetic nephropathy,DN)数据集中的DEG主要富集于细胞表面受体信号通路、受体结合等。主要富集的京都基因和基因组数据库(Kyoto Encyclopedia of Genes and Genomes,KEGG)通路包括细胞因子-细胞因子受体相互作用、磷脂酰肌醇3-激酶(phosphatidylinositol 3-kinase,PI3K)/蛋白激酶B(protein kinase B,PKB/AKT)信号通路等。WGCNA和PPI两部分hub基因取交集,验证了64个hub基因,再次用KEGG注释hub基因,发现大部分hub基因富集在“细胞外基质(extracellular matrix,ECM)-受体相互作用”和“PI3K/AKT信号通路”。在64个hub基因中,COMP呈显著高表达(logFC>2),而PI3K/AKT/mTOR信Objective·To further clarify the mechanism of podocyte damage by studying the expression of cartilage oligomeric matrix protein(COMP)in glomerular podocytes and its relationship with podocyte autophagy under high glucose environment.Methods·The gene expression dataset GSE104948 was downloaded from the GENE EXPRESSION OMNIBUS(GEO)database,and differentially expressed genes(DEGs)were obtained via GEO2R.The molecular functions and signaling pathways related to differential genes were summarized.The most correlated key genes(hub genes)were acquired by Weighted Gene Co-Expression Network Analysis(WGCNA)and the protein-protein interaction network(PPI)of DEGs was constructed with STRING database.The enrichment analysis was performed again.Conditionally immortalized mouse podocyte cells were cultured in vitro.After being fully differentiated,they were stimulated with high glucose,and the expressions of COMP,mammalian target of rapamycin(mTOR),microtubule-associated protein 1 light chain3(LC3)and other proteins in podocytes were detected by Western blotting.The shRNA constructed by lentiviral vector was further used to infect podocytes to inhibit the expression of COMP,and the stable cell strains were screened by puromycin.The expression of COMP,mTOR,and LC3 of stable strains were detected by Western blotting,in order to observe the effect of COMP on autophagy.Results·A total of 362 DEGs were filtered for subsequent analysis.Among these DEGs,284 genes were up-regulated and 78 genes were down-regulated.The results of Gene Onotology(GO)term analysis showed that DEGs in diabetic nephropathy(DN)were mainly enriched in cell surface receptor signaling pathway,receptor binding,etc.The main enriched Kyoto Encyclopedia of Genes and Genomes(KEGG)pathways included phosphatidylinositol 3-kinase(PI3K)/protein kinase B(PKB/AKT)signaling pathway,extracellular matrix(ECM)-receptor interaction,etc.Sixty-four hub genes were refined through the intersection of WGCNA and PPI hub genes,and the hub genes with significantly increased or decr

关 键 词：糖尿病肾病 足细胞 自噬 生物信息学 差异基因 软骨寡聚基质蛋白(COMP) 

分 类 号：R58[医药卫生—内分泌]