IL-3, IL-4, and IL-6 enhance IFN-gamma-dependent bone marrow natural suppressor activity

Cellular Immunology
J H HoldaH N Claman


The ability of murine bone marrow (BM) natural suppressor (NS) cells to suppress a Con A proliferation assay was greatly enhanced by supernatant obtained from the T cell hybridoma D9C1.12.17. Of the lymphokines produced by this hybridoma, three were found to enhance suppression: interleukin-3 (IL-3), IL-4, and IL-6. These molecules enhanced suppression of both unirradiated and irradiated (2000 R) BM cells indicating that augmented suppression was not just due to proliferation of NS cells. The ability of all three of the lymphokines to enhance BM suppression could be blocked by anti-interferon-gamma (IFN-gamma) antibody. These results indicate that (1) NS cell activity is not radiosensitive and (2) that two signals may be required for maximal NS cell suppression, one being a lymphokine-mediated signal and the other IFN-gamma.


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