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Department of Pharmacology and Pathophysiology, Utrecht Institute for Pharmaceutical Sciences, Utrecht University, Utrecht, The Netherlands
The mechanisms involved in nonatopic asthma are poorly defined. In
particular, the importance of mast cells in the development of
nonatopic asthma is not clear. In the mouse, pulmonary hypersensitivity
reactions induced by skin sensitization with the low-m.w. compound
dinitrofluorobenzene (DNFB) followed by an intra-airway application of
the hapten have been featured as a model for nonatopic asthma. In
present study, we used this model to examine the role of mast cells in
the pathogenesis of nonatopic asthma. First, the effect of DNFB
sensitization and intra-airway challenge with dinitrobenzene sulfonic
acid (DNS) on mast cell activation was monitored during the early
phase of the response in BALB/c mice. Second, mast cell-deficient
W/Wv and
Sl/Sld mice and their respective
normal (+/+) littermate mice and mast cell-reconstituted
W/Wv mice (bone marrow-derived mast
cells
W/Wv) were used. Early
phase mast cell activation was found, which was maximal 30 min after
DNS challenge in DNFB-sensitized BALB/c, +/+ mice but not in mast
cell-deficient mice. An acute bronchoconstriction and increase in
vascular permeability accompanied the early phase mast cell activation.
BALB/c, +/+ and bone marrow-derived mast
cell
W/Wv mice sensitized with DNFB
and DNS-challenged exhibited tracheal hyperreactivity 24 and 48 h
after the challenge when compared with vehicle-treated mice. Mucosal
exudation and infiltration of neutrophils in bronchoalveolar lavage
fluid associated the late phase response. Both mast cell-deficient
strains failed to show any features of this hypersensitivity response.
Our findings show that mast cells play a key role in the regulation of
pulmonary hypersensitivity responses in this murine model for nonatopic
asthma.
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