Endothelial cell-derived S1P promotes migration and stemness by binding with GPR63 in colorectal cancer.

Hematological metastasis was the main metastatic method of colorectal cancer and the main reason for failure of radical surgery. Vascular endothelial cells played an important role in tumor hematologic metastasis. We previously performed RNA-Seq on primary and metastatic colorectal carcinoma (CRC) tissues and then identified GPR63 as a potential metastasis-promoting gene, but its role and mechanisms in the interaction between cancer cells and vascular endothelial cells were still unknown. In this study, GPR63 was significantly elevated in CRC tissues compared with paracarcinoma tissues. GPR63 expression was closely related to lymph node metastasis and distant metastasis in 147 CRC tissues. GPR63 promoted cell migration and stemness. Moreover, endothelial cell-derived S1P enhanced the migration and sphere-forming ability of CRC through activation of GPR63. Mechanistically, S1P promoted GPR63 binding to Src to activate JAK2/STAT3 pathway, and therefore promoted CRC cell migration. Our study revealed a novel mechanism by which endothelial cells promoted metastasis of CRC cells, which might have potential as a promising target for CRC therapy.