Abstract
We used light and electron microscopic immunocytochemistry to study distributional changes in the human Langerhans cell (LC) system during the first 14 days of a mild irritancy caused by sodium lauryl sulphate (SLS). A marked initial decrease in epidermal LC was noted possibly resulting from migration from the epidermis to the dermis and from irreversible cell damage. Several studies have previously found an unchanged number of LC in SLS-induced contact irritant dermatitis, but these studies may not have taken into account the fact that SLS is effectively absorbed from the test chamber. Unless certain precautions are taken the SLS concentration rapidly falls to topical levels that have no effect on the LC system. Simultaneously with the decrease in the epidermis we observed an increase in dermal CD1a+ cells, confirming an often reported finding. There is, however, no consensus as to the identity of these cells, and several authors have reported that such cells lack LC granules and thus these cells have often been classed as indeterminate cells. We found that, during irritant contact dermatitis, provided an adequate number of sections were scrutinized in the electron microscope, all dermal CD1+ cells contained Birbeck granules.
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Mikulowska, A., Falck, B. Distributional changes of Langerhans cells in human skin during irritant contact dermatitis. Arch Dermatol Res 286, 429–433 (1994). https://doi.org/10.1007/BF00371567
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DOI: https://doi.org/10.1007/BF00371567