Abstract
Murine epidermal Langerhans cells were analyzed with fluorescence microscopy and multicolor flow cytometry for the surface expression of major histocompatibility complex (MHC) class I and class II antigens. Langerhans cells of H-2k haplotype were identified in situ or in epidermal-cell suspensions by their surface expression of the MHC class II determinants I-Ak and I-Ek. More than 90% of class II-positive Langerhans cells in epidermal-cell suspensions expressed no or barely detectable amounts of MHC class I antigens. Quantitation by flow cytometry revealed that H-2k Langerhans cells expressed only 1.6-3.3% as much H-2Kk as did class II-negative keratinocytes in the same epidermal-cell suspensions. By fluorescence microscopy, class I MHC antigens were not detectable on Langerhans cells in situ when analyzed on sheets of intact epidermis. The deficient expression of class I MHC permitted highly purified Langerhans cell populations to be isolated from epidermal cell suspensions by treatment with anti-class I MHC monoclonal antibody and complement. It is likely that the uniquely low cell-surface expression of class I MHC antigen by Langerhans cells has relevance to both immune responses in the skin as well as to mechanisms of skin allograft rejection. In addition, it is conceivable that regulation of class I MHC expression on antigen-presenting cells in general is an important but hitherto unrecognized mechanism of immune regulation.
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