Abstract
A synergistic interaction between rat lymphoid cell subsets was found for the in vitro immune response to the syngeneic Gross virus-induced lymphoma (C58NT)D. Mixtures of thymocytes and lymph node cells from inbred WF rats primed in vivo to the lymphoma demonstrated significantly greater proliferative and cytotoxic reactivities in vitro than would be expected from the sum of the reactivities of the two cell types tested separately. A soluble extract of nonimmune syngeneic thymocytes, shown in previous studies to amplify the in vitro responses to alloantigen, was also demonstrated to increase significantly proliferative and cytotoxic responses in vitro to syngeneic lymphoma cells. Preliminary evidence indicated that this soluble thymus amplifier factor differed from previously described thymus factors.
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