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Primes Sensory Nerve Endings in a Pulmonary Hypersensitivity Reaction
Department of Pharmacology and Pathophysiology, Utrecht Institute for Pharmaceutical Sciences, Utrecht University, Utrecht, The Netherlands
TNF-
is a cytokine associated with inflammatory diseases,
including asthma. Increased levels of TNF-
were found in the
bronchoalveolar lavage fluid of mice undergoing a dinitrofluorobenzene
(DNFB)-induced non-IgE-mediated pulmonary hypersensitivity reaction. We
report in this work that TNF-
increases the susceptibility of
sensory neurons to dinitrobenzene sulfonic acid (DNS) and capsaicin,
leading to a tracheal vascular hyperpermeability response in
DNFB-sensitized and DNS-challenged mice. mAb against TNF-
or the
TNFR1 inhibited this hyperpermeability response in DNFB-sensitized and
DNS-challenged mice. Furthermore, the hyperpermeability response after
DNS challenge was abolished in DNFB-sensitized mast cell-deficient
WBB6F1-W/WV mice. These
animals showed a remarked decrease of TNF-
bronchoalveolar lavage
fluid levels after a single DNS challenge. The hyperpermeability
response after DNS challenge was regained in mast cell-deficient mice
after mast cell reconstitution. These findings indicate a prominent
role for TNF-
and its TNFR1 in the DNFB-induced tracheal
hyperpermeability response. We propose that a priming effect of mast
cell-derived TNF-
on the sensory neurons could be the mechanism of
action of TNF-
in the vascular hyperpermeability response in
tracheas of mice undergoing a pulmonary hypersensitivity
reaction.
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