Cytostatic and cytotoxic activity of mouse spleen cells against normal and tumour target cells has been studied. The comparative analysis of mouse spleen cell cytostatic and cytotoxic activity after exposure to cyclophosphamide has shown that the effectors of natural cytotoxic activity are highly sensitive to cyclophosphamide, while cytostatic effectors are heterogeneous in their sensitivity to cyclophosphamide. Pretreatment of spleen cells with alpha-interferon produced an increase in cytotoxic and cytostatic activity against tumour target cells. The cells of lymphoid organs (spleen, bone marrow, thymus) had greater distinctions in cytotoxic than in cytostatic activity against tumour target cells.
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