Circ_0001982 accelerates the progression of colorectal cancer via sponging microRNA-144.

OBJECTIVE: The aim of this study was to uncover the expression pattern and biological function of circ_0001982 in the progression of colorectal cancer (CRC). PATIENTS AND METHODS: Relative expression level of circ_0001982 in 66 paired CRC tissues and adjacent normal tissues was detected by quantitative Real Time-Polymerase Chain Reaction (qRT-PCR). The association between circ_0001982 level and clinical indexes of CRC patients was assessed. The effect of circ_0001982 on cellular behaviors of HT29 and HCT-116 cells was evaluated in vitro. Dual-Luciferase reporter gene assay was conducted to verify the binding relation between circ_0001982 and microRNA-144. Finally, rescue experiments were performed to assess the role of the circ_0001982/microRNA-144 axis in mediating the progression of CRC. RESULTS: Circ_0001982 was significantly up-regulated in CRC tissues when compared with adjacent normal ones. CRC patients with a high expression level of circ_0001982 showed a significantly higher rate of distant metastasis and worse survival. Knockdown of circ_0001982 remarkably attenuated the proliferative, migratory, and invasive capacities of HCT-116 cells. However, opposite results were observed after the overexpression of circ_0001982 in HT29 cells. MicroRNA-144 was verified as a target gene of circ_0001982, which could be negatively regulated by circ_0001982. Furthermore, microRNA-144 was capable of reversing the regulatory effect of circ_0001982 on the proliferative, migratory, and invasive capacities of CRC cells. CONCLUSIONS: Up-regulated circ_0001982 was closely related to distant metastasis and poor prognosis of CRC. In addition, circ_0001982 attenuated the progression of CRC by negatively regulating microRNA-144.