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Journal of Experimental Medicine, Vol 167, 712-717, Copyright © 1988 by Rockefeller University Press
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P Ralph, I Nakoinz and D Rennick
Department of Cell Biology, Cetus Corporation, Emeryville, California 94608.
Pretreatment of murine peritoneal exudate macrophages with 1-5 U/ml rIFN-gamma or rIL-2, or higher concentrations of IFN-alpha or IFN-beta greatly stimulated ADCC to Rl lymphoma targets. The assay was direct counting of viable target cells after 9 and 24 h using an E/T ratio of 5:1. 2d of pretreatment was optimal for enhancing ADCC. rIL-4 was inactive and IL-4-depleted Con A-induced spleen lymphokine retained its ADCC-stimulating activity. Antibody to IFN-gamma blocked the ADCC- promoting effect of the lymphokine, suggesting a major role for this factor.
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