Identification and Validation of Key miRNAs and a microRNA-mRNA Regulatory Network Associated with Ulcerative Colitis.

Ulcerative colitis (UC) is a chronic, nonspecific, intestinal inflammatory disease that involves various genes and pathways in its pathogenesis. The current study revealed the key miRNAs and potential target gene regulatory network as a model for predicting the molecular mechanism of UC. This may provide novel insights for unraveling the pathogenesis of UC. Differentially expressed miRNAs (DEMIs) and mRNAs (differentially expressed genes [DEGs]) between UC patients and normal controls were screened using the Gene Expression Omnibus database. DEMI target genes were predicted using the miRDB, miRWalk, starBase, TarBase, and TargetScan databases, and an miRNA-mRNA network was established using DEGs that altered in opposition to DEMIs. We verified the expression of key DEMIs in a rodent UC model. The miRNA-mRNA network contained 31 DEMIs and 199 DEGs, which showed enrichment in inflammatory bowel disease. We selected 2 key miRNAs and 4 hub genes. In addition, we identified six DEMIs and genes from the preliminary validation analysis in model tissues. In the pathophysiological process of UC, various genes and proteins display expression differences and complex interactions with each other. These findings provide new insights into the potential key mechanisms associated with UC development.