The Anti-CLA antibody recognizes the cutaneous lymphocyte-associated antigen (CLA), a specialized glycoform of P-selectin glycoprotein ligand-1 (PSGL-1). It serves as a ligand for selectins, including CD62E (ELAM-1) and CD62L (LECAM-1). CLA is a unique skin-homing receptor and is predominantly found on a minor subset of human T cells that infiltrate the skin. This post-translational modification of PSGL-1 is thought to serve as a mechanism to regulate tissue-specific homing of CD4
memory/effector T cells from peripheral blood to the skin, which plays an essential role during many inflammatory and certain malignant skin diseases.
In peripheral blood, CLA is not only found on skin-homing
memory/effector T cells, but is also found to be expressed on memory/effector B cells, NK cells, blood dendritic cells, and on monocytes. CLA is furthermore found on Langerhans cells in the skin.