Abstract
The in vitro antiproliferative effects of recombinant interferons (IFNs) alpha and gamma against the murine reticulum-cell sarcoma M5076 and the malignant melanoma B16 F10 were evaluated using the human hybrid IFN-alpha A/D (rHuIFN-alpha A/D), which is active on murine cells, and recombinant murine IFN gamma (rMuIFN-gamma). An isobologram analysis was used to evaluate the interactive antiproliferative effects of the recombinant IFNs on these two tumor cell lines. The data, in contrast to prior reports, indicate that rHuIFN-alpha A/D and rMuIFN-gamma interact in an additive rather than a synergistic manner against M5076 cells. When a similar analysis was performed on B16 F10 cells, synergy was obtained. Thus, either a synergistic or an additive antiproliferative effect can be obtained by combining IFN-alpha and IFN-gamma, depending upon the cell line used in the assay.
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