Purpose: Dysregulated circular RNAs (circRNAs) have been shown to play important roles in various cancers, and could serve as diagnostic biomarkers. However, research focusing on the roles of the circRNAs in laryngeal squamous cell carcinoma (LSCC) is limited. This research aimed to explore the expressions of hsa_circ_0036722 in LSCCs and its diagnostic significance.
Materials and Methods: The expression levels of the circular RNA, hsa_circ_0036722, and its parental gene, RHCG, in 41 pairs of LSCC tissues and paired adjacent normal tissues were validated with quantitative real-time polymerase chain reaction (qRT-PCR). The diagnostic values of hsa_circ_0036722 alone and combined with RHCG in LSCC were evaluated using receiver operating characteristic (ROC) curves. Bioinformatics analysis predicted likely cross-talk between hsa_circ_0036722 and RHCG. Then, qRT-PCR and luciferase reporter assay were used to examine the effect of hsa_circ_0036722 on miR-1248 and miR-1248 on RHCG expression. CCK-8 assays were conducted to investigate their effects on LSCC cell line.
Results: Hsa_circ_0036722 and RHCG were downregulated in LSCC tissues (P < 0.0001). The expression level of hsa_circ_0036722 was significantly correlated with the differentiation level of LSCC (P = 0.018). The area under the ROC curve of hsa_circ_0036722 was 0.838, which reached 0.859 when hsa_circ_0036722 was combined with RHCG as a biomarker. Mechanistically, hsa_circ_0036722 could directly sponge miR-1248 to antagonize its inhibitory effect on RHCG. And downregulation of hsa_circ_0036722 could promote the proliferation of LSCC cell line through upregulating miR-1248.
Conclusion: Our results indicated that hsa_circ_0036722 was downregulated in LSCC, which regulate the function of RHCG in LSCC via inhibiting miR-1248, and it could serve as a potential diagnostic marker for LSCC.
Keywords: circular RNA, diagnostic significance, laryngeal squamous cell carcinoma, biomarker