Inhibitor κB and Nuclear Factor κB in Granulocyte‐Macrophage Colony‐Stimulating Factor Antagonism of Dexamethasone Suppression of the Macrophage Response toAspergillus fumigatusConidia

Abstract
BackgroundThe dexamethasone (DEX) immunosuppressive effect on macrophage killing activity and cytokine production in response to Aspergillus fumigatus conidia is antagonized by granulocyte-macrophage colony-stimulating factor (GM-CSF). The molecular mechanism is unknown. We postulated that this antagonism is mediated by inhibitor κB (IκB) induction by DEX and is opposed by acceleration of IκB degradation by GM-CSF with or without conidia stimulation, with corresponding effects on translocation and activation of nuclear factor κB (NF-κB)

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