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- W2095998520 abstract "Peritoneal-and pulmonary macrophages can be activated in vitro with lymphokines (LK) or IFN-gamma, without exogenous lipopolysaccharide, for fungicidal activity against several pathogenic fungi. However, neither the biochemical nor metabolic events of the activation process or of the effector phase have been defined. In the present work we sought to elucidate these events with time-course studies using inhibitors of protein synthesis as well as immunosuppressive agents. We found that protein synthesis inhibitors abrogated the activation process, because cycloheximide (CHX) (1-2 micrograms/ml) prevented activation of macrophages for fungicidal activity against Candida albicans, Blastomyces dermatitidis, and Paracoccidioides brasiliensis. Blocking of the activation process by CHX was not due to macrophage cytotoxicity, and CHX did not impair the ability of nonactivated macrophages to kill Candida parapsilosis. In kinetic studies we showed that activation of macrophages was induced in 4 hr of LK treatment and that CHX had no effect if added after this time. In contrast to CHX, therapeutic concentrations of hydrocortisone (HC), such as less than or equal to 5 micrograms/ml, or cyclosporin A (CsA), 5 micrograms/ml, did not significantly inhibit LK activation of macrophages for killing of fungi. In the effector phase, the fungicidal capacity of activated macrophages in short-term (less than or equal to 4 hr) killing assays could not be abrogated by CHX (5 micrograms/ml), HC (100 micrograms/ml), or CsA (10 micrograms/ml). These results demonstrate that the activation but not the effector mechanism of macrophages for fungicidal activity is blocked by inhibition of protein synthesis. In contrast, therapeutic concentrations of HC or CsA may not interfere with activation of macrophages or their killing mechanisms, thus providing a rationale for antifungal immunotherapy in certain clinical situations (e.g., infection in the immunosuppressed patient)." @default.
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- W2095998520 date "1991-01-01" @default.
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- W2095998520 title "Kinetics and requirements for activation of macrophages for fungicidal activity: Effect of protein synthesis inhibitors and immunosuppressants on activation and fungicidal mechanism" @default.
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- W2095998520 doi "https://doi.org/10.1016/0008-8749(91)90022-4" @default.
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