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Immunol."],"abstract":"<jats:sec><jats:title>Background<\/jats:title><jats:p>There is a complex interaction between chronic kidney disease (CKD) and ulcerative colitis (UC), but the pathophysiological mechanisms underlying the coexistence of CKD and UC are unclear. This study aimed to investigate the key molecules and pathways that may mediate the co-occurrence of CKD and UC through quantitative bioinformatics analysis based on a public RNA-sequencing database.<\/jats:p><\/jats:sec><jats:sec><jats:title>Methods<\/jats:title><jats:p>The discovery datasets of CKD (GSE66494) and UC (GSE4183), as well as validation datasets of CKD (GSE115857) and UC (GSE10616), were downloaded from the Gene Expression Omnibus (GEO) database. After identifying differentially expressed genes (DEGs) with GEO2R online tool, the Gene Ontology (GO) and Kyoto Encyclopedia of Genes and Genomes (KEGG) pathway enrichment analyses for the DEGs were performed. Next, protein-protein interaction network was constructed with Search Tool for the Retrieval of Interacting Genes (STRING) and visualized by Cytoscape. Gene modules were identified by the plug-in MCODE and hub genes were screened using the plug-in CytoHubba. Then, correlation between immune cell infiltration and hub genes was analyzed, and the receiver operating characteristic curves were used to assess the predictive value of hub genes. Finally, immunostaining of human specimens was used to validate the relevant findings.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>A total of 462 common DEGs were identified and selected for further analyses. GO and KEGG enrichment analyses indicated that these DEGs were primarily enriched in immune- and inflammation-related pathways. Among them, the PI3K-Akt signaling pathway ranked top in both discovery and validation cohorts, and the key signal molecule phosphorylated Akt (p-Akt) was shown to be significantly overexpressed in human CKD kidneys and UC colons, and further elevated in CKD-UC comorbidity specimens. Moreover, nine candidate hub genes, including <jats:italic>CXCL8<\/jats:italic>, <jats:italic>CCL2<\/jats:italic>, <jats:italic>CD44<\/jats:italic>, <jats:italic>ICAM1<\/jats:italic>, <jats:italic>IL1A<\/jats:italic>, <jats:italic>CXCR2<\/jats:italic>, <jats:italic>PTPRC<\/jats:italic>, <jats:italic>ITGAX<\/jats:italic>, and <jats:italic>CSF3<\/jats:italic>, were identified, of which <jats:italic>ICAM1<\/jats:italic> was validated as a common hub gene. Besides, immune infiltration analysis revealed that neutrophils, macrophages, and CD4<jats:sup>+<\/jats:sup> T memory cells significantly accumulated in both diseases, and <jats:italic>ICAM1<\/jats:italic> was remarkably associated with neutrophil infiltration. Furthermore, intercellular adhesion molecule1 (ICAM1)-mediated neutrophil infiltration was validated to be upregulated in kidney and colon biopsies of CKD and UC patients, and further increased in patients diagnosed with both CKD and UC. Finally, ICAM1 had shown critical value as a diagnostic marker for the co-occurrence of CKD and UC.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusions<\/jats:title><jats:p>Our study elucidated that immune response, PI3K-Akt signaling pathway, and ICAM1-mediated neutrophil infiltration might be the common pathogenesis of CKD and UC, and identified ICAM1 as a key potential biomarker and therapeutic target for the comorbidity of these two diseases.<\/jats:p><\/jats:sec>","DOI":"10.3389\/fimmu.2023.1078310","type":"journal-article","created":{"date-parts":[[2023,2,13]],"date-time":"2023-02-13T06:56:45Z","timestamp":1676271405000},"update-policy":"https:\/\/doi.org\/10.3389\/crossmark-policy","source":"Crossref","is-referenced-by-count":21,"title":["Identification of shared gene signatures and molecular mechanisms between chronic kidney disease and ulcerative 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