Summary
Prostaglandins can inhibit the generation of lymphokine-activated killer (LAK) cells by interleukin-2 (IL-2) whereas indomethacin augmented the induction of LAK cells by inhibiting prostaglandin synthesis. In the present study we demonstrate that prostaglandin E2 substantially inhibited the generation of both LAK and antibody-dependent cellular cytotoxicity (ADCC) activity by IL-2. In addition, indomethacin enhanced the induction of LAK activity and ADCC in splenocytes exposed to IL-2 in vitro. The effect of indomethacin was dose-dependent, reaching an optimal effect at 1 µM when 100–1000 units/ml IL-2 were employed. The effect of indomethacin on the generation of ADCC was seen in cells taken from both tumor-bearing mice and normal mice. ADCC induced by IL-2 was augmented by culturing cells from the spleen, liver and lungs, in the presence of indomethacin. ADCC induced in the presence of IL-2 and indomethacin was mediated by cells that were mainly plastic non-adherent cells and expressed the asialo-GM1 glycolipid. The potential of indomethacin in combined therapy with cytokines and specific anti-tumor monoclonal antibodies is discussed.
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Eisenthal, A. Indomethacin up-regulates the generation of lymphokine-activated killer-cell activity and antibody-dependent cellular cytotoxicity mediated by interleukin-2. Cancer Immunol Immunother 31, 342–348 (1990). https://doi.org/10.1007/BF01741405
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DOI: https://doi.org/10.1007/BF01741405