Recombinant gamma interferon induces HLA-DR expression on cultured human keratinocytes.


In normal human epidermis, expression of HLA-DR antigen is restricted to Langerhans cells (LC) and acrosyringial epithelium. However, in diseases such as lichen planus and graft-vs.-host, HLA-DR antigen appears to be expressed by keratinocytes, although the exact source of the HLA-DR is unclear. Two possibilities are that (1) the HLA-DR is shed by neighboring immunocompetent cells, or (2) that the keratinocytes are synthesizing the antigen themselves. Recently, gamma interferon has been shown to induce HLA-DR biosynthesis and expression on human malignant melanoma cells lines and on normal vascular endothelium. We report here that pure recombinant human gamma interferon (100 units/ml) induces HLA-DR expression on 60-70% of cultured human adult keratinocytes depleted of LC within 2-4 days of culture as determined by fluorescence-activated cell sorter (FACS) analysis using monoclonal antibodies. No residual LC or lymphocytes could be detected in these cultures. This is the first demonstration of HLA-DR expression by cultured human keratinocytes. This expression may be of functional significance in antigen presentation and cell-mediated cytotoxicity involving the epidermis.


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@article{Basham1984RecombinantGI, title={Recombinant gamma interferon induces HLA-DR expression on cultured human keratinocytes.}, author={Teresa Y. Basham and Brian J . Nickoloff and Thomas C . Merigan and Vera B . Morhenn}, journal={The Journal of investigative dermatology}, year={1984}, volume={83 2}, pages={88-90} }