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American Journal of Pathology, Vol 141, 855-860, Copyright © 1992 by American Society for Investigative Pathology

REGULAR ARTICLES

Role of beta 1-integrins in epidermotropism of malignant T cells

W Sterry, V Mielke, U Konter, I Kellner and WH Boehncke
Department of Dermatology, University of Ulm, Germany.

To better understand the molecular mechanisms of epidermotropism, we immunohistochemically analyzed the expression pattern of adhesion molecules belonging to the integrin and immunoglobulin superfamilies in cases of mycosis fungoides (MF) (n = 15), pleomorphic T cell lymphoma (n = 10), and high-grade T cell lymphoma (n = 7). The cutaneous T cell lymphomas (CTCLs) investigated were categorized into cases with or without epidermotropism. Focal neoexpression of ICAM-1 on keratinocytes was restricted to epidermotropic lymphomas. Both LFA-1 and LFA-3 were expressed on infiltrating cells in all cases investigated. In contrast, beta 1-integrins showed differential expression, most prominent in the case of VLA-1 and VLA-6: These molecules were present on infiltrating cells in most cases with epidermotropic MF and absent in most other CTCLs. We conclude that the phenomenon of epidermotropism might involve different sets of adhesion molecules in different entities of CTCL, with VLA-1 being the most influential beta 1-integrin in the case of MF.


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Copyright © 1992 by the American Society for Investigative Pathology.