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Protective effect(s) of rIL-2 modulation. I. The effects of chemotherapeutic/cytotoxic agents on human natural killer cells and lymphokine-activated killer cells.

This study investigated whether in vitro immunotherapy with rIL-2 which augments human natural cytotoxicity and generation of lymphokine-activated killer cells diminished or inhibits the severity of therapeutically induced human in vitro NK immunosuppression. We demonstrate that rIL-2 induces a rapid and potent enhancement of cytolytic killing and that pretreatment of effector cells for one hour with rIL-2 yields effector cells which are more resistant to drug-induced immunosuppression. Additionally, we demonstrate cells pretreated for 24 hours with rIL-2 were less sensitive to drug inhibitory effects than rIL-2 non-treated or one hour pretreated effector cells. Our data suggest prophylactic treatment with IL-2 for drug induced immunosuppression is feasible.