title: Functional antagonism between type I and type II interferons on human macrophages.
abstract: A three-day treatment with IFN-gamma enhanced up to 300% the capacity of human monocytes and macrophages to produce H2O2 during the respiratory burst. IFN-alpha or -beta (type I IFNs), which did not by themselves influence the burst, were found to antagonize the enhancing effect of IFN-gamma (type II IFN). The antagonism was concentration-dependent and required the presence of type I IFNs during the whole period of IFN-gamma pretreatment. These results suggest that the host defense function of mononuclear phagocytes may be controlled by the relative local concentrations of type I and type II IFNs.
mesh_terms: D006801:Humans; D006861:Hydrogen Peroxide / Q000096:biosynthesis; D066298:In Vitro Techniques; D007370:Interferon Type I / Q000494:pharmacology*; D007371:Interferon-gamma / Q000037:antagonists & inhibitors / Q000494:pharmacology*; D008262:Macrophage Activation; D008264:Macrophages / Q000187:drug effects* / Q000378:metabolism; D009000:Monocytes / Q000187:drug effects* / Q000378:metabolism
chemical_list: D007370:Interferon Type I; D007371:Interferon-gamma; D006861:Hydrogen Peroxide