The Novel Circular RNA circTRIO Silence Inhibits the Progression of Laryngeal Squamous Cell Carcinoma.

Abstract

Laryngeal squamous cell carcinoma (LSCC) is the most common and prevalent malignant tumor in head and neck squamous cell carcinoma. Recent studies have shown that circular RNAs (circRNAs) play a vital role in cancer development, but their specific role in the tumorigenesis and development of LSCC remains unclear. We selected five pairs of LSCC tumor tissues and paracancerous tissues for RNA sequencing. Reverse transcription-quantitative PCR (RT-qPCR), Sanger sequencing, and fluorescence in situ hybridization were utilized to study the expression, localization, and clinical significance of circTRIO in LSCC tissues, and TU212 and TU686 cell lines. Furthermore, cell counting Kit-8, colony-forming assay, Transwell, and flow cytometry assays were assessed to illustrate the crucial role played by the circTRIO in proliferation, colony-forming ability, migration, and apoptosis in LSCC cells. Finally, the molecule's role as a microRNA (miRNA) sponge was analyzed. In the results, we screened out a promising upregulated novel circRNA-circTRIO in LSCC tumor tissues compared with paracancerous tissues using RNA sequencing. Then, we used qPCR to evaluate the expression of circTRIO in 20 additional paired LSCC tissues and two cells, and the results showed that circTRIO was highly expressed in LSCC and that this high expression was closely related to the malignant progression of LSCC. Furthermore, we examined circTRIO expression in the Gene Expression Omnibus data sets GSE142083 and GSE27020, and circTRIO expression was considerably higher in tumor tissues compared with the adjacent tissues. Kaplan-Meier survival analysis showed that the expression of circTRIO was associated with worse disease-free survival. The Gene Set Enrichment Analysis biological pathway evaluation results demonstrated that circTRIO was mainly enriched in cancer pathways. Moreover, we confirmed that silencing circTRIOs can help to significantly inhibit LSCC cell proliferation and migration while triggering apoptosis. Upregulated circTRIO expression levels may play an important role in the tumorigenesis and development of LSCC.