Colon cancer cells secreted CXCL11 via RBP-J kappa to facilitated tumour-associated macrophage-induced cancer metastasis

Metastasis is the main cause of colon cancer-related deaths. RBP-J kappa is involved in colon cancer development, but its function in colon cancer metastasis is still unclear. Tumour-associated macrophages are the main cell components in tumour microenvironments. Here, we aimed to determine the function of RBP-J kappa in colon cancer metastasis and its underlying mechanisms for modulating interactions between colon cancer cell and tumour-associated macrophages. Through bioinformation analysis, we found that RBP-J kappa was overexpressed in colon cancer tissues and associated with advanced colon cancer phenotypes, macrophage infiltration and shorter survival overall as confirmed by our patients' data. And our patients' data show that RBP-J kappa expression and tumour-associated macrophages infiltration are associated with colon cancer metastasis and are independent prognostic factors for colon cancer patients. Tumour-associated macrophages induced colon cancer cell migration, invasion and epithelial-mesenchymal transition through secreting TGF-beta 1. Colon cancer cells with high RBP-J kappa expression induced the expression of TGF-beta 1 in tumour-associated macrophages by secreting CXCL11. Our research revealed that colon cancer cells secreted CXCL11 via overexpression of RBP-J kappa to enhance the expression of TGF-beta 1 in tumour-associated macrophages to further promote metastasis of colon cancer cells.