Journal
JOURNAL OF CLINICAL IMMUNOLOGY
Volume 24, Issue 4, Pages 426-434Publisher
SPRINGER/PLENUM PUBLISHERS
DOI: 10.1023/B:JOCI.0000029111.27168.c6
Keywords
asthma; permeability; epithelial denudation; Th2; IL-4; IL-13
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Funding
- NIAID NIH HHS [R01 AI 45338-04, R01 AI 37454-08] Funding Source: Medline
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Asthma is characterized by infiltration and shedding of the bronchial epithelium. The Th2 cytokines IL-4 and IL-13 are involved in the cellular recruitment and infiltration seen in asthma. The effects of IL-4 and IL-13 on cell-matrix interactions and epithelial shedding are unknown. We hypothesize that bronchial airway epithelial cells ( BAEC) express paxillin, a structural focal adhesion protein, and downregulation of paxillin by Th2 cytokines lead to BAEC hyperpermeability. We showed by confocal microscopy the presence of paxillin in BAEC. We demonstrated by Western blot analysis that IL- 4 and IL- 13 stimulation results in downregulation of paxillin production. IL- 4 and IL-13 stimulation decreased epithelial cell - matrix attachment as measured by electrical cell - substrate impedance sensing system (ECIS). Our results suggest that Th2 cytokines IL- 4 and IL- 13 downregulate paxillin production by BAEC, thereby disrupting the cell - matrix interactions. This may help explain the epithelial shedding and epithelial membrane hyperpermeability that occurs in asthma.
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