The Journal of Experimental Medicine
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Journal of Experimental Medicine, Vol 161, 366-377, Copyright © 1985 by Rockefeller University Press

ARTICLES

In situ analysis of antigens on malignant and benign cells of the melanocyte lineage. Differential expression of two surface molecules, gp75 and p89

B Holzmann, JP Johnson, P Kaudewitz and G Riethmuller

Monoclonal antibodies (mAb) were selected for differential binding to sections of freshly frozen biopsy material of human malignant melanomas and their precursor lesions, the melanocytic nevi. Both melanomas and normal nevi expressed human Ia-like antigens, transferrin receptor and the transferrin-related molecule p97. In contrast, only 1 nevus of 21 tested expressed both glycoprotein gp75, defined by mAb 15.75, and protein p89, defined by mAb P3.58, whereas 12 of 15 melanomas tested expressed both antigens. mAb P3.58 reacted with one additional melanoma and one nevus. The expression of these two molecules therefore appears to be correlated with the appearance of the malignant phenotype of melanocytes.
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