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- W1966241477 abstract "There is substantial evidence that local production of proinflammatory cytokines are very important in host resistance to aspergillosis. Dexamethasone (DEX) down-regulates production of these cytokines by stimulated bronchoalveolar macrophages (BAM) and constitutes a risk factor for aspergillosis. Granulocyte-macrophage colony-stimulating factor (GM-CSF) antagonizes DEX suppression of antifungal activity by BAM. Here we investigated the possibility that GM-CSF could antagonize DEX down-regulation of interleukin (IL)-1alpha and tumour necrosis factor (TNF)-alpha production by stimulated BAM. Control BAM responded to increasing numbers of conidia of Aspergillus fumigatus with increasing production of IL-1 and TNF. DEX (10(-7)M) significantly suppressed IL-1 and TNF production by BAM+conidia. Although GM-CSF did not enhance IL-1 or TNF production by BAM+conidia, GM-CSF significantly antagonized DEX suppression of IL-1 cytokine production. For comparative purposes, lipopolysaccharide (LPS, 1 microg/ml) was used to stimulate BAM in experiments similar to the above. In contrast to the findings with conidia, GM-CSF enhanced the production of IL-1 (5-fold) and TNF (1.5-fold) by LPS treated BAM. DEX suppression of cytokine production by BAM+LPS was modestly but significantly antagonized by GM-CSF. Moreover, differences between regulation of IL-1 and TNF production by BAM+conidia or LPS and peritoneal macrophages (PM)+conidia or LPS were documented. Finally, the anti-inflammatory cytokine IL-10 was minimally produced by BAM + conidia or LPS, but IL-10 was produced by PM + conidia or LPS. In summary, these data indicate that the risk factor for aspergillosis associated with DEX could be lessened in the pulmonary compartment with GM-CSF. On the other hand, desired effects of DEX could be maintained in other compartments." @default.
- W1966241477 created "2016-06-24" @default.
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- W1966241477 date "2002-07-01" @default.
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- W1966241477 title "REGULATION OF BRONCHOALVEOLAR MACROPHAGE PROINFLAMMATORY CYTOKINE PRODUCTION BY DEXAMETHASONE AND GRANULOCYTE-MACROPHAGE COLONY-STIMULATING FACTOR AFTER STIMULATION BY ASPERGILLUS CONIDIA OR LIPOPOLYSACCHARIDE" @default.
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- W1966241477 doi "https://doi.org/10.1006/cyto.2002.1049" @default.
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