Abstract
Spleen cells from W/Fu rats 4 to 6 weeks after immunization with syngeneic Gross virus-induced lymphoma (C58NT)D cells usually lack detectable activity in a short-term 51Cr release assay. The results presented here demonstrate that these spleen cells retain the capacity to generate significant proliferative and cytotoxic activity upon re-exposure to mitomycin C-treated (C58NT)D cells in vitro. Optimal conditions were defined in W/Fu rats for this secondary immune response in vitro to the (C58NT)D cells. The cytotoxic response was observed to be quantitative, reproducible, and specific. Optimal generation occurred 5 days after initiation of cultures with a 30:1 responding cell:stimulating cell ratio. In vitro generated cytotoxic cells inhibit tumor growth in vivo when administered as a mixture with tumor cells.
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