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Partial purification of a macrophage-activating factor for glucose consumption (MAF-G) produced by a human T-cell hybridoma and its relation to a growth-promoting factor.

A material that enhances the glucose consumption of oil-induced peritoneal macrophages of guinea pig, the activity being named MAF-G activity, was purified approximately 780-fold from human T cell hybridoma conditioned medium. A material showing growth-promoting activity was co-purified with that showing the MAF-G activity from the same conditioned medium. The two materials showed an identical isoelectric point of pH 4.7. When the partially purified MAF-G increased glucose consumption, it did not induce glucose carbon-1 oxidation. MAF-G activity was inhibited by mitomycin C and colchicine, which inhibit DNA synthesis and mitosis, respectively, but not by 2-deoxy-D-glucose, an inhibitor of glucose metabolism. The partially purified MAF-G also enhanced the glucose consumption and proliferation of human monocytes. These observations suggest that MAF-G may be identical with the growth-promoting factor for macrophages.