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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 J+Allergy+Clin+Immunol
2016 ; 137
(5
): 1382-1389.e9
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Lack of autophagy induces steroid-resistant airway inflammation
#MMPMID26589586
Suzuki Y
; Maazi H
; Sankaranarayanan I
; Lam J
; Khoo B
; Soroosh P
; Barbers RG
; James Ou JH
; Jung JU
; Akbari O
J Allergy Clin Immunol
2016[May]; 137
(5
): 1382-1389.e9
PMID26589586
show ga
BACKGROUND: Neutrophilic corticosteroid-resistant asthma accounts for a
significant proportion of asthma; however, little is known about the mechanisms
that underlie the pathogenesis of the disease. OBJECTIVE: We sought to address
the role of autophagy in lung inflammation and the pathogenesis of
corticosteroid-resistant neutrophilic asthma. METHODS: We developed
CD11c-specific autophagy-related gene 5 (Atg5)(-/-) mice and used several murine
models to investigate the role of autophagy in asthmatic patients. RESULTS: For
the first time, we found that deletion of the Atg5 gene specifically in CD11c(+)
cells, which leads to impairment of the autophagy pathway, causes unprovoked
spontaneous airway hyperreactivity and severe neutrophilic lung inflammation in
mice. We found that severe lung inflammation impairs the autophagy pathway,
particularly in pulmonary CD11c(+) cells in wild-type mice. We further found that
adoptive transfer of Atg5(-/-), but not wild-type, bone marrow-derived dendritic
cells augments lung inflammation with increased IL-17A levels in the lungs. Our
data indicate that neutrophilic asthma in Atg5(-/-) mice is glucocorticoid
resistant and IL-17A dependent. CONCLUSION: Our results suggest that lack of
autophagy in pulmonary CD11c(+) cells induces neutrophilic airway inflammation
and hyperreactivity.