CCR10

C-C chemokine receptor type 10 (CCR10, GPR2) is a Gαi-coupled receptor that mediates skin and mucosal homing through its ligands CCL27 (CTACK/ALP) and CCL28 (MEC), which are produced by epidermal keratinocytes and mucosal epithelial cells respectively. CCR10 cooperates with CCR4 and the cutaneous lymphocyte antigen to direct memory T cells-particularly cutaneous CD8+ and dermal γδ T-cell subsets-to inflamed and steady-state skin, while CCL28-CCR10 additionally recruits IgA-producing plasmablasts to mucosal surfaces of the gut, lactating mammary gland and salivary glands, linking the receptor to secretory immunity. In the inflamed skin of psoriasis and atopic dermatitis, CCR10+ T cells and keratinocyte CCL27 form a feedback loop amplifying lymphocyte retention. CCR10 is overexpressed in cutaneous T-cell lymphoma, breast cancer and melanoma, facilitating cutaneous and organ metastasis; in HIV pathogenesis, CCL28 exhibits antiviral properties by blocking viral entry. The CCR10-CCL27/28 axis thus integrates barrier-specific lymphocyte trafficking with epithelial homeostasis and disease.