Requirement for IFN Gamma in Potentiation of Interferon's Antiviral and Anticellular Activities: Identity of Mouse and Human Systems

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Abstract
Potentiation was originally demonstrated as a nonadditive, synergistic enhancement of interferon (IFN) activity in the mouse system for mixed preparations containing MuIFN-alpha/beta and MuIFN-gamma. Potentiation of the antiviral and anticellular activities has now been studied for mouse and human systems, and in both systems IFN-alpha and IFN-beta interacted synergistically with IFN-gamma, but not with each other. Further, the antiviral and anticellular activities of IFN-alpha and IFN-beta were potentiated equally by IFN-gamma. Potentiation was demonstrated for HuIFNs with specific activities of 10(7) U/mg of protein and higher. Naturally produced and recombinant HuIFN-alpha s had the same relative abilities to be potentiated by HuIFN-gamma. It was concluded that IFN-gamma with either IFN-alpha or IFN-beta was essential for potentiation, that potentiation of anticellular and antiviral actions occurred in similar manners, and that a close correlation existed between potentiation in mouse and human systems. These results suggest that potentiation was caused by the interaction of two dissimilar IFN types (immune versus virus-type) and that potentiation studies in the mouse may be directly relevant for humans.