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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 Am+J+Respir+Crit+Care+Med
2012 ; 185
(3
): 301-10
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Cystic fibrosis transmembrane conductance regulator regulates epithelial cell
response to Aspergillus and resultant pulmonary inflammation
#MMPMID22135344
Chaudhary N
; Datta K
; Askin FB
; Staab JF
; Marr KA
Am J Respir Crit Care Med
2012[Feb]; 185
(3
): 301-10
PMID22135344
show ga
RATIONALE: Mutations in the cystic fibrosis transmembrane conductance regulator
(CFTR) alter epithelial cell (EC) interactions with multiple microbes, such that
dysregulated inflammation and injury occur with airway colonization in people
with cystic fibrosis (CF). Aspergillus fumigatus frequently colonizes CF airways,
but it has been assumed to be an innocent saprophyte; its potential role as a
cause of lung disease is controversial. OBJECTIVES: To study the interactions
between Aspergillus and EC, and the role of the fungus in evoking inflammatory
responses. METHODS: A. fumigatus expressing green fluorescent protein was
developed for in vitro and in vivo models, which used cell lines and mouse
tracheal EC. MEASUREMENTS AND MAIN RESULTS: Fungal spores (conidia) are rapidly
ingested by ECs derived from bronchial cell lines and murine tracheas, supporting
a role for EC in early airway clearance. Bronchial ECs harboring CFTR mutations
(?F508) or deletion demonstrate impaired uptake and killing of conidia, and ECs
with CFTR mutation undergo more conidial-induced apoptosis. Germinated (hyphal)
forms of the fungus evoke secretion of inflammatory mediators, with CFTR mutation
resulting in increased airway levels of macrophage inflammatory protein 2 and KC,
and higher lung monocyte chemotactic protein-1. After A. fumigatus inhalation,
CFTR(-/-) mice develop exaggerated lymphocytic inflammation, mucin accumulation,
and lung injury. CONCLUSIONS: Data demonstrate a critical role for CFTR in
mediating EC responses to A. fumigatus. Results suggest that the fungus elicits
aberrant pulmonary inflammation in the setting of CFTR mutation, supporting the
potential role of antifungals to halt progressive CF lung disease.