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The Journal of Immunology, Vol 136, Issue 2 484-490, Copyright © 1986 by American Association of Immunologists

ARTICLES

Cell surface expression of invariant gamma-chain of class II histocompatibility antigens in human skin

L Claesson-Welsh, A Scheynius, U Tjernlund and PA Peterson

A rat monoclonal antibody (McAb 21:9) reactive with the human invariant gamma-chain of class II major histocompatibility complex (MHC)-encoded antigens was isolated and was shown to react with the carbohydrate- carrying, COOH-terminal part of the gamma-chain. The McAb 21:9 binds to a molecule that is identified as the gamma-chain for the following reasons: it has an apparent m.w. of 33,000, similar to that of the gamma-chain; it has a two-dimensional gel migration pattern identical to that of the gamma-chain; and it associates with immature, but not processed class II antigens. When used for immunohistochemical staining on sections of normal human skin, only dendritic, class II MHC antigen, and anti-Leu-6 reactive Langerhans cells are labeled in the epidermis. HLA-DR-expressing keratinocytes present in the tuberculin reaction, cutaneous T cell lymphoma, and lichen planus, however, did not react with the anti-gamma-chain antibody, nor with a HLA-DQ-reactive antibody. Cell surface expression of the gamma-chain was observed on 1 to 3% of normal viable epidermal cells in suspension. By using double indirect immunofluorescence, it was possible to demonstrate the simultaneous binding of anti-gamma-chain, anti-HLA-DR, anti-Leu-10, and anti-Leu-6 antibodies, respectively, on the same cells, thus confirming their identity as Langerhans cells. The presence of the gamma-chain on the surface of the immunocompetent Langerhans cells may indicate that the cell surface, not the cytoplasm as has been suggested, is the site of the primary function of the gamma-chain.


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