Circular RNA circ_0046264 Suppresses Osteosarcoma Progression via microRNA-940/Secreted Frizzled Related Protein 1 Axis

• Published in: The Tohoku Journal of Experimental Medicine Vol. 254; no. 3; pp. 189 - 197
• Main Authors: Du, Rui, Fu, Bingjin, Sun, Guangchao, Ma, Bingdong, Deng, Mingming, Zhu, Xiaodong, Kong, Dehai
• Format: Journal Article
• Language: English
• Published: Japan Tohoku University Medical Press 2021
• Subjects: Bone Neoplasms; Cell Line, Tumor; Cell Proliferation - genetics; circ_0046264; Humans; Intracellular Signaling Peptides and Proteins; microRNA-940; MicroRNAs - genetics; migration; osteosarcoma; Osteosarcoma - genetics; RNA, Circular; secreted frizzled related protein 1; migration; circ_0046264; microRNA-940; secreted frizzled related protein 1; osteosarcoma
• ISSN: 0040-8727; 1349-3329
• DOI: 10.1620/tjem.254.189

Circular RNAs (circRNAs) feature prominently in regulating tumor progression. The study aims to investigate the role and mechanism of circ_0046264 in osteosarcoma. In this study, dysregulated circRNAs in osteosarcoma tissues and adjacent tissues were screened out by analyzing circRNA microarray (GSE140256). The expressions of circ_0046264 in 58 osteosarcoma tissues and 4 osteosarcoma cell lines were detected by quantitative real-time polymerase chain reaction. Subsequently, the relationship of circ_0046264 expression level and clinical features were analyzed. Ethyldeoxyuridine assay and Transwell assay were employed to detect cell viability, migration and invasion. Dual-luciferase reporter assay was adopted to confirm the targeting relationships between circ_0046264 and microRNA-940 (miR-940), as well as miR-940 and secreted frizzled related protein 1 (SFRP1). SFRP1 expression was determined by western blot. Here, we demonstrated that circ_0046264 was greatly down-regulated in osteosarcoma and was inversely related to tumor size and Ki67 expression. Functional assays validated that circ_0046264 could restrain the proliferation, migration and invasion. Mechanistically, circ_0046264 could adsorb miR-940 and indirectly modulate SFRP1 expression. Furthermore, the transfection of miR-940 mimics or SFRP1 small interfering RNA could reverse the impact of circ_0046264 overexpression on the growth, migration and invasion of osteosarcoma cells. Taken together, circ_0046264 is a tumor suppressor to inhibit the osteosarcoma progression via modulating the miR-940 / SFRP1 axis.