Circular RNA hsa_circ_0074362 Promotes Glioma Cell Proliferation, Migration, and Invasion by Attenuating the Inhibition of miR-1236-3p on HOXB7 Expression.

Abstract

As a novel type of noncoding RNAs, circular RNAs (circRNAs) have been acknowledged as pivot effectors in multiple physiological and pathological processes, including cancer. Although an increasing number of circRNAs are gradually discovered, their function and mechanism in tumorigenesis remain largely unknown. In this study, we identified hsa_circ_0074362 as an oncogene in glioma. We examined hsa_circ_0074362 expression in glioma tissues and cell lines by qRT-PCR and investigated its functions by using CCK8 and transwell assays. Luciferase reporter assays were conducted to confirm the interaction between miR-1236-3p and hsa_circ_0074362 or HOXB7. Results demonstrated that hsa_circ_0074362 was significantly upregulated in glioma tissues compared with normal tissues, and hsa_circ_0074362 overexpression was correlated with clinical severity and poor prognosis in patients with glioma. Moreover, hsa_circ_0074362 knockdown remarkably suppressed glioma cell proliferation, migration, and invasion. Luciferase reporter assay indicated that hsa_circ_0074362 acted as a sponge of miR-1236-3p to promote HOXB7 expression. Thus, hsa_circ_0074362 played a crucial role in glioma progression by regulating the miR-1236-3p/HOXB7 pathway.