Abstract
Mouse peritoneal macrophages (M phi) expressed enhanced tumoricidal activity upon in vitro stimulation either with the lymphokine M phi-activating factor (MAF) or with fibroblast interferon (IFN-beta). In contrast, M phi suppressive activity on lymphoproliferation was not affected by MAF pretreatment, but was drastically reduced or abolished by IFN-beta. Catalase, the enzyme involved in the destruction of hydrogen peroxide (H2O2), did significantly decrease M phi suppressive capacity but had no effect on M phi tumoricidal activity. Analysis of the phagocytosis-dependent H2O2 production by IFN-beta-treated M phi demonstrated a strong impairment of the oxygen metabolite release, which strictly paralleled the decreased M phi suppressive capacity. On the other hand, MAF did not modify H2O2 release by M phi. Studies on M phi antibacterial activity against Salmonella typhimurium, a function thought to depend upon H2O2 production, showed that exposure of M phi to IFN-beta significantly impaired their bactericidal and bacteriostatic capacity, again in close correlation with the decrease in H2O2 production. Thus, IFN-beta appears as modulating both suppressive and antibacterial capacities of M phi through reduction of their oxygen metabolism, whereas regulation of M phi anti-tumour activity is possibly controlled by different mechanisms.
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Selected References
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