Coactosin-Like Protein (COTL1) Promotes Glioblastoma (GBM) Growth in vitro and in vivo.

Objective To assess the expression levels of COTL1 in human GBM tissues and evaluate the potential involvement of COTL1 in cancer progression. Methods Bioinformation analysis was performed to evaluate COTL1 mRNA levels in GBM tissues and normal tissues, according to the TCGA database, and explore the effects on prognosis. Immunohistochemical (IHC) assays were performed to evaluate COTL1 expression in human GBM tissues and the clinical pathological analysis was performed. Colony formation and MTT assays were performed to evaluate the effects of COTL1 on GBM cell proliferation. Immunoblot assays were performed to detect the expression level of COTL1, Ki67, and PCNA. A xenograft model was developed in mice to assess the effects of COTL1 on tumor growth in vivo. Results We found COTL1 had an obvious high expression in human GBM tissues. The expression of COTL1 was related to recurrence (P=0.006**) and prognosis of patients with GBM. Our data further demonstrated COTL1 promoted cell proliferation in vitro and contributed to tumor growth of GBM cells in mice. Conclusion We therefore identified a novel and promising therapeutic target for the treatment of GBM.