The response of human and animal cells to the action of fusicoccyne (FC), a fungal metabolite with phytohormonal properties, was evaluated. As shown by in vitro studies, FC had the capacity to induce the production of early interferon (IFN) in the blood serum of non-inbred white mice and to enhance the natural cytotoxic activity of human lymphocytes. In vitro experiments also revealed that the action of FC inhibited the metabolism of actively proliferating monocytic leukemia cells J-96 and human ovarian carcinoma cells CaOv, as well as mouse fibroblasts L-929. The common character of the mechanism of action of FC and IFN, having well-known antiproliferative and immunomodulating activity, is discussed.
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