Abstract

MiR‐490‐3p is regarded as a tumor suppressor in many cancers, but whether miR‐490‐3p is involved in the development of bladder cancer remains unknown. BALB/c nude mice (male, 15–20 g) were used to investigate the role of MiR‐490‐3p in bladder cancer. The relationship between miR‐490‐3p and PCBP2 involved in bladder cancer regulation were determined. Cell viability, proliferation, and cell cycle were estimated by cell counting kit‐8 (CCK‐8) assay, 5‐bromo‐2′‐deoxyuridine (BrdU) detection, and flow cytometry analysis, respectively. In animal experiments, lentivirus was transfected into bladder cancer cells to overexpress miR‐490‐3p, which were then injected into mice and the change of tumor volume was assessed. Principal findings: The expression of MiR‐490‐3p was decreased in bladder cancer cells. Overexpression of miR‐490‐3p inhibited bladder cancer cell viability and proliferation. Moreover, overexpression of miR‐490‐3p caused cell cycle arrest in bladder cancer cells. The inhibitory effect of miR‐490‐3p on bladder cancer cells growth could be counteracted by enhancing PCBP2 expression. In vivo, bladder cancer growth in mice was blocked by miR‐490‐3p upregulation. MiR‐490‐3p suppressed bladder cancer growth and bladder cancer cell proliferation by down‐regulating PCBP2 expression.