IGFBP7 is associated to prognosis and could suppress cell survival in cholangiocarcinoma

AbstractInsulin-like growth factor-binding protein 7 (IGFBP7) is a secreted protein and its expression was restrained in varied solid tumours, but there was no report about biological role of IGFBP7 in cholangiocarcinoma (CCA). Here, we found that high expression of IGFBP7 correlated to a better overall survival in CCA patients. To investigate the hypothetic antineoplastic activity of IGFBP7 in CCA, we induced overexpression of IGFBP7 in QBC939 and RBE cells, as well as knockdown in HCCC9810 cells. And the biological functions triggered by level changes of IGFBP7 were assessed, including proliferation, cell cycle distribution, apoptosis and invasion evaluation. Cell growth assessment showed that enhanced IGFBP7 expression significantly retarded proliferation rates of QBC939 and RBE cells while an enhancement was observed in IGFBP7-inhibited HCCC9810 cells. The inhibition of cell viability was induced via G2/M phase arrest and apoptosis. Both QBC939 and RBE cells possess highly invasive ability, and IGFBP7...