Cutaneous antigen-presenting cells (CAPCs)

Cutaneous antigen-presenting cells (CAPCs) are a specialized group of immune cells located in the skin, primarily comprising epidermal Langerhans cells and various dermal dendritic cell subsets (Nestle et al., 2009, Nature Reviews Immunology). Their fundamental biological role is to capture antigens, migrate to regional lymph nodes, and present these antigens to T cells to initiate adaptive immune responses or maintain peripheral tolerance (StatPearls, 2023, Physiology, Antigen Presenting Cells). CAPCs are central to the pathogenesis of numerous dermatological conditions, including psoriasis, atopic dermatitis, and allergic contact hypersensitivity, where they may drive aberrant inflammatory cycles (Merad et al., 2008, Trends in Immunology). In therapeutic applications, these cells are targeted by agents such as imiquimod, which activates them via TLR7 to treat skin cancers and viral warts, or calcineurin inhibitors like tacrolimus, which suppress their ability to activate T cells in inflammatory diseases (PubChem, CID 5353940). Because CAPCs represent a heterogeneous cellular population rather than a single molecular entity, they are considered a cellular target for drug delivery and immunotherapy rather than a discrete molecular receptor. They are also being investigated as targets for transdermal vaccines, where their high density in the skin allows for potent immune stimulation with minimal antigen doses. Monitoring the density and activation state of these cells, often through markers like CD1a or HLA-DR, provides insights into the efficacy of dermatological treatments.

Other names

Skin-resident dendritic cellsSkin APCsLangerhans cells and dermal dendritic cellsCutaneous dendritic cells

Modulation of antigen processing and presentation via Toll-like receptor (TLR) activation or inhibition of calcineurin-mediated signaling pathways.