Leukocyte-Endothelial Cell Interaction

Leukocyte-endothelial cell interaction refers to the dynamic, multi-step process by which leukocytes (white blood cells) adhere to and migrate across the vascular endothelium. This process is fundamental for immune surveillance, inflammation, and tissue repair. It enables leukocytes to exit the bloodstream at sites of infection or injury and enter tissues where they perform their immune functions. The interaction occurs in several coordinated steps: Tethering, Rolling, Activation, Firm Adhesion, and Transmigration. Key molecules involved include selectins (E-, P-, L-selectin), integrins (e.g., β2-integrins like LFA-1/CD11a/CD18), and immunoglobulin superfamily molecules such as ICAM-1 and VCAM-1. Dysregulation or excessive activation can contribute to chronic inflammatory diseases such as inflammatory bowel disease, ischemia/reperfusion injury, and autoimmune disorders. Therapeutic strategies targeting these interactions aim either to block inappropriate recruitment (anti-inflammatory) or enhance it when needed for host defense or tissue repair.

Blocking leukocyte recruitment; Enhancing leukocyte recruitment