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- W2114328256 abstract "Invasive pulmonary aspergillosis is a common and devastating complication of immunosuppression, whose incidence has increased dramatically in tandem with the increase in the number of immunocompromised patients. Given the role of TNF-alpha in other pulmonary infections, we hypothesized that TNF-alpha is an important proximal signal in murine invasive pulmonary aspergillosis. Intratracheal challenge with Aspergillus fumigatus conidia in both neutropenic (cyclophosphamide-treated) and nonneutropenic BALB/c mice resulted in the time-dependent increase in lung TNF-alpha levels, which correlated with the histologic development of a patchy, peribronchial infiltration of mononuclear and polymorphonuclear cells. Ab-mediated neutralization of TNF-alpha resulted in an increase in mortality in both normal and cyclophosphamide-treated animals, which was associated with increased lung fungal burden as determined by histology and as quantified by chitin content. Depletion of TNF-alpha resulted in a reduced lung neutrophil influx in both normal and cyclophosphamide-treated animals, which occurred in association with a decrease in lung levels of the C-X-C chemokine, macrophage inflammatory protein-2 and the C-C chemokines macrophage inflammatory protein-1alpha and JE. In cyclophosphamide-treated animals, intratracheal administration of a TNF-alpha agonist peptide (TNF70-80) 3 days before, but not concomitant with, the administration of Aspergillus conidia resulted in improved survival from 9% in control mice to 55% in TNF70-80-treated animals. These studies indicate that TNF-alpha is a critical component of innate immunity in both immunocompromised and immunocompetent hosts, and that pretreatment with a TNF-alpha agonist peptide in a compartmentalized fashion can significantly enhance resistance to A. fumigatus in neutropenic animals." @default.
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- W2114328256 date "1999-02-01" @default.
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- W2114328256 title "Role of TNF-alpha in pulmonary host defense in murine invasive aspergillosis." @default.
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