Abstract:Immunocytes adhesion and migration are critical for immune response and homeostasis, and play important roles in immune surveillance, host defence and even cancer metastasis. Immunocyte homing requires a cascade of four distinct molecular steps: immunocyte rolling, activation, firm adhesion and migration on endothelium. These steps reply on integrin functions that are regulated by cell microenvironments including biological, chemical and physical microenvironments. The dysregulation of cell microenvironments triggers aberrant immunocyte adhesion and migration, resulting in inflammatory diseases and even cancer. In this review, we aim to discuss the role of cell microenvironments in regulating immunocyte adhesion, migration and its underlying mechanism.