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In vitro study demonstrates superior macrophage activation by interferon-gamma in human cells, highlighting its unique role in antiparasitic defense.
Cytokines affecting mononuclear phagocytes were screened for activation of human macrophages to secrete H2O2 and kill toxoplasmas. In contrast to recombinant interferon-gamma (rIFN gamma), the following factors, tested in partially or highly purified form and over a wide range of concentrations, did not augment these functions: native interferon-alpha (nIFN alpha), rIFN alpha A, rIFN alpha D, rIFN beta, colony stimulating factor (type 1) (CSF-1), CSF for granulocytes and macrophages (GM-CSF), pluripotent CSF (p-CSF), tumor necrosis factor (TNF), native interleukin 2 (nIL-2), and rIL-2. Partially purified migration inhibitory factor (MIF) enhanced H2O2-releasing capacity submaximally without inducing antitoxoplasma activity, and warrants further study.
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Nathan et al. (1984) studied this question.
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