Abstract
Neutrophils (PMNs) are a critical line of defense against Aspergillus fumigatus infection. Increased frequency of invasive aspergillosis has been observed in patients receiving corticosteroids, suggesting a deleterious effect of these compounds on PMN antifungal function. To investigate this hypothesis and to determine the potential preventive utility of granulocyte colony-stimulating factor (G-CSF) and gamma interferon (IFN-gamma), the effects of hydrocortisone (HCS) and dexamethasone (DXS) on PMN-induced damage of Aspergillus fumigatus hyphae were studied with or without pretreatment of PMNs with G-CSF and IFN-gamma. PMNs treated with HCS (> or = 3,000 microM) or DXS (> or = 10 microM) during a 2-h colorimetric tetrazolium metabolic assay (using methylthiotetrazolium) showed suppressed percentage of hyphal damage (P < 0.02). In addition, both HCS (> or = 30 microM) and DXS (> or = 1 microM) significantly suppressed oxidative burst measured as superoxide anion release by PMNs in response to opsonized and nonopsonized hyphae as well as to N-formylmethionyl leucyl phenylalanine. Pretreatment of PMNs with G-CSF (4,000 U/ml) and/or IFN-gamma (100 and 1,000 U/ml) for 90 min prevented the suppression of hyphal damage that occurred in the presence of HCS (3,000 microM; P < 0.01) or DXS (10 microM; P < or = 0.001). G-CSF (4,000 U/ml) and IFN-gamma (100 U/ml) combined had an additive effect on increasing the antifungal activity of HCS-treated but not of DXS-treated PMNs compared with IFN-gamma alone (P = 0.015). Thus, these findings reveal that corticosteroids impair PMN function in response to A. fumigatus and that G-CSF and IFN-gamma prevent this impairment.
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