Mir-21-5p and Mir-455-5p as markers for diagnosis and prognosis of rectal adenocarcinoma may reduce local CD4+ and CD8+ lymphocyte infiltration

Objective: This study aimed to verify miRNAs and the molecular mechanisms of diagnostic and prognostic biomarkers for rectal adenocarcinoma. background: - Methods: Two miRNA datasets of rectal adenocarcinoma were obtained from GEO and TCGA. GEO2R tool, Venn diagram, Kaplan-Meier survival analysis, KEGG pathway analyses, DIANA TOOLS, and Wilcoxon rank-sum test were used for biological information analysis. The diagnostic utility of miRNAs and immune infiltration of tumors in Chinese patients were validated by RT-qPCR and immunofluorescence analysis. objective: This study was aimed at verifying miRNAs and the molecular mechanisms of diagnostic and prognostic biomarkers for rectal adenocarcinoma. Results: MiR-21-5P and miR-455-5p were both found to have a significant correlation with poor prognosis and higher expression in rectal adenocarcinoma. Besides, the ability to prognosis was independent of the clinicopathological stage. MiR-21-5P and miR-455-5p were enriched in the TGF-beta, Wnt, MAKP, and PI3K-AKT signaling pathways. Meanwhile, the high expression phenotype of miR-21-5P and miR-455-5p decreased CD4+ and CD8+ T cells. Conclusion: In summary, we found two significant diagnostic and prognostic miRNAs of rectal adenocarcinoma via integrated bioinformatics approach and clinical trials, which might decrease CD4+ and CD8+ T cells. result: MiR-21-5P and miR-455-5p were both found to have a significant correlation with poor prognosis and higher expression in rectal adenocarcinoma. Besides, the ability to judge prognosis was independent of the clinicopathological stage. MiR-21-5P and miR-455-5p were enriched in the TGF-beta, Wnt, MAKP, and PI3K-AKT signaling pathway. Meanwhile, the high expression phenotype of miR-21-5P and miR-455-5p decreased CD4+ and CD8+ T cells. conclusion: In summary, we found two significant diagnostic and prognostic miRNAs of rectal adenocarcinoma via an integrated bioinformatics approach and clinical trials, which might decrease CD4+ and CD8+ T cells.