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- W2015929976 abstract "Appropriate experimental conditions were devised to demonstrate that CD58 (LFA-3), CD54 (ICAM-1) and CD11a/CD18 (LFA-1) adhesion molecules are the source of signals that regulate nonspecific major histocompatibility complexunrestricted and CD3/T cell receptor (TcR)-triggered cytotoxicity. Using anti-LFA-3 monoclonal antibody (mAb)-treated, interleukin-2 (IL-2)-cultured peripheral blood lymphocytes (PBL) or cloned CD3+/CD8+ cells as lymphocyteactivated killer (LAK) effectors, and ligand (CD2)-negative tumor cell lines as targets, a down-regulation of CD3− and CD3+ cell-mediated LAK activity was consistently observed. Anti-LFA-3 mAb also down-regulated tumor cell lysis when T cell clones were triggered to kill P815 cells through stimulation of the CD3/TcR complex by an anti-CD3 mAb. The inhibitory effect of anti-LFA-3 mAb was not prevented by stimulatory anti-CD2 mAb. Anti-ICAM-1 mAb treatment of IL-2-cultured PBL consistently up-regulated LAK cytotoxicity against tumor target cells. However, this effect was only exerted on CD3− LAK effectors. Anti-LFA-1 mAb blocked conjugate formation between effector cells and tumor target cells, thus rendering this model unsuitable to evaluate the regulatory role of LFA-1. Therefore, a cytotoxicity model system was applied in which a hybrid anti-CD3/anti-human red blood cell (HuRBC) mAb triggers cytolytic T cells to lyse HuRBC. In these experiments, anti-LFA-1 mAb markedly up-regulated the lytic ability of IL-2-cultured PBL. We conclude that mAb against LFA-3, ICAM-1 and LFA-1 molecules deliver regulatory signals for LAK cells and cytotoxic T lymphocytes. As these stimuli may be delivered by ligands expressed on tumor targets as well as on other immune competent and inflammatory cells, the present observations are relevant in the context of both the host's immune response against tumors and the general functioning of the immune system." @default.
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- W2015929976 date "1992-08-01" @default.
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- W2015929976 title "Adhesion molecule-mediated signals regulate major histocompatibility complex-unrestricted and CD3/T cell receptor-triggered cytotoxicity" @default.
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- W2015929976 doi "https://doi.org/10.1002/eji.1830220814" @default.
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