The Journal of Immunology, Vol 147, Issue 12 4398-4401, Copyright © 1991 by American Association of Immunologists

ARTICLES

Shedding of ICAM-1 from human melanoma cell lines induced by IFN-gamma and tumor necrosis factor-alpha. Functional consequences on cell- mediated cytotoxicity

JC Becker, R Dummer, AA Hartmann, G Burg and RE Schmidt
Department of Dermatology, University of Wurzburg, FRG.

ICAM-1-mediated cell-cell adhesion is essential for various immunologic functions, including non-MHC-restricted cytotoxicity. The present study was designed to establish whether shedding of ICAM-1 from melanoma cells occurred and to characterize the effects of soluble ICAM-1 on some cell adhesion-dependent functions. The shed soluble ICAM-1 molecule was detected and quantified by a specific ELISA. Shedding of ICAM-1 could be induced by IFN-gamma and TNF-alpha alone, or more effectively, by a combination of the two cytokines together. The use of purified soluble ICAM-1 enabled us to test for the functional significance of the ICAM-1 shedding from tumor cells. Conjugate formation between the cloned NK cell line CNK6 and the erythromyeloid cell line K562, as well as between lymphokine-activated killer cells and the melanoma cell line M26, could be inhibited by purified soluble ICAM-1 and cell-free supernatants from melanoma cell cultures containing shed ICAM-1. Furthermore, the non-MHC-restricted cytotoxicity mediated by NK and lymphokine-activated killer cells could be abrogated either by purified soluble ICAM-1 or by melanoma cell culture supernatants containing shed ICAM-1. Thus, shedding of ICAM-1 may be one of the mechanisms by which neoplastic cells escape immunosurveillance.

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