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- W2074545785 abstract "The present study explores a model for tumor cell-induced immunosuppression and reversal of suppression by cytokines and other pharmacological agents. To simulate tumor-cell-induced suppression, a panel of suppressor agents which included CsA (cyclosporin A), SSP (staurosporine), BSO (L-buthionine-[S,R]-sulfoximine) and PMA, and a panel of anti-suppressor agents which included IL-2, IL-4, GSH (glutathione) and amiloride, were tested. These suppressor/anti-suppressor agents acted differently on four specific sites of the immune arm that affected the alpha CD3-induced T cell proliferative and cytotoxic responses. They included (1) IL-2 production, (2) PKC-regulated cytolytic granule production, (3) GSH-regulated maturation of functional granules, and (4) granule exocytosis. When a single suppressor agent was used, all the suppressor agents tested in this study inhibited the generation of alpha CD3-induced activated killer cells (CD3-AK), whereas alpha CD3-induced proliferation was inhibited by CsA, BSO, and EL-4 tumor cells. Except for EL-4, suppression induced by a single suppressor agent could be corrected by an appropriate single anti-suppressor agent. Multiple suppressor agents induced profound suppression of CD3-AK response. In most cases, multiple anti-suppressor agents were required to correct the immune defects induced by multiple suppressor agents. Finally, EL-4 tumor-cell-induced immunosuppression could not be corrected by any single anti-suppressor agent tested, but a combination of IL-4, GSH and amiloride fully restored the CD3-AK response. These results suggest that tumor cells may induce multiple immune defects that require multiple anti-suppressor agents for correcting the defects to restore the host immunocompetence." @default.
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- W2074545785 date "1995-08-01" @default.
- W2074545785 modified "2023-09-24" @default.
- W2074545785 title "Reversal of multiple-site tumor cell-induced immunosuppression by specific cytokines and pharmacological agents" @default.
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- W2074545785 doi "https://doi.org/10.1016/0162-3109(95)00013-j" @default.
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