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2014 ; 11 Suppl 5
(Suppl 5
): S259-62
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Apoptosis and engulfment by bronchial epithelial cells Implications for allergic
airway inflammation
#MMPMID25525729
Penberthy KK
; Juncadella IJ
; Ravichandran KS
Ann Am Thorac Soc
2014[Dec]; 11 Suppl 5
(Suppl 5
): S259-62
PMID25525729
show ga
Insult or injury to the lung epithelial cells from pathogens, pollutants, and
allergens can initiate the process of apoptotic cell death. Although "Creola
bodies," which are clusters of uncleared, apoptotic, epithelial cells, have been
seen in the sputum of patients with asthma, the clearance of these dying
epithelial cells and the consequence of failed clearance in the airway have not
been directly addressed. We have observed that bronchial epithelial cells
efficiently engulf their apoptotic neighbors and produce antiinflammatory
cytokines when engulfing apoptotic cells. Furthermore, when the phagocytic
capacity of bronchial epithelial cells was impaired, mice developed severe,
IL-33-dependent, allergic airway inflammation. This inflammation could be
ameliorated by exogenous administration of the antiinflammatory cytokine IL-10.
Our data suggest that the process of apoptotic cell engulfment is a mechanism by
which bronchial epithelial cells regulate the inflammatory environment within the
lung. Collectively, these studies suggest that impaired engulfment pathways in
airway epithelial cells can contribute to allergic airway inflammation and that
targeting these pathways may be of benefit in human airway inflammation.