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CUTTING EDGE |
* School of Biological Sciences and
Faculty of Medical and Health Sciences, University of Auckland, Auckland, New Zealand
Recent data from murine models have confirmed that Langerhans cells are not the only population of APCs in the skin involved in initiating immune responses. In healthy human skin, we identify CD1a+ dermal APCs located close to the lymphatic vessels in the upper layers of the dermis that are unequivocally distinct from migrating Langerhans cells but exhibit both potent allostimulatory capacity and a chemotactic response to CCR7 ligands. In contrast, CD14+ dermal APCs are distributed throughout the dermis and lack a chemotactic response to CCR7 ligands. CD1a+ dermal APCs therefore represent an APC population distinct from Langerhans cells that are capable of migrating to lymph nodes and stimulating naive T cells. In humans, CD1a+ dermal APCs may fulfill some of the roles previously ascribed to Langerhans cells.
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