Background：Acts as a ligand for both CX3CL1 and integrins. Binds to CX3CR1(PubMed:23125415, PubMed:9931005, PubMed:21829356). Binds to integrins ITGAV:ITGB3 and ITGA4:ITGB1. Can activate integrins in both a CX3CR1-dependent and CX3CR1-independent manner. In the presence of CX3CR1, activates integrins by binding to the classical ligand-binding site(site 1) in integrins. In the absence of CX3CR1, binds to a second site(site 2) in integrins which is distinct from site 1 and enhances the binding of other integrin ligands to site 1(PubMed:23125415, PubMed:24789099). The soluble form is chemotactic for T-cells and monocytes and not for neutrophils. The membrane-bound form promotes adhesion of those leukocytes to endothelial cells. May play a role in regulating leukocyte adhesion and migration processes at the endothelium(PubMed:9024663, PubMed:9177350).
