Integrin beta-2 activation pathway (β2 integrin activation pathway)

The β2 integrin activation pathway is a critical intracellular signaling cascade in leukocytes that regulates their ability to adhere firmly to blood vessel walls and migrate into tissues during immune responses. This process involves conformational changes in β2 integrins—from an inactive bent state to an extended high-affinity state—triggered by signals from chemokine receptors and selectins via inside-out signaling mechanisms. Key cytoplasmic mediators include kinases such as Syk and PI3K, small GTPases like Rap1a, adaptor proteins talin‑1 and kindlin‑3 which bind directly to the cytoplasmic tail of β subunits inducing conformational change necessary for ligand binding. Proper functioning of this pathway is essential for effective leukocyte recruitment during inflammation; defects lead to immunodeficiency while overactivation contributes to chronic inflammatory diseases[1][2][3].

Other names

β2 integrin inside-out signalingLeukocyte β2 integrin activationCD18 family activation pathway