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Department of Pathology University of Michigan Medical School, Ann Arbor, MI 48109
The role of CXCR during allergic airway and asthmatic diseases is
yet to be fully characterized. Therefore, the present study addressed
the role of CXCR2 during Aspergillus fumigatus-induced
asthma. Mice deficient in CXCR2 (CXCR2-/-) and wild-type
counterparts (CXCR2+/+) were sensitized to A.
fumigatus Ags and challenged with A. fumigatus
conidia, and the resulting allergic airway disease was monitored for up
to 37 days. At days 3 and 7 after conidia, CXCR2-/- mice
exhibited significantly greater methacholine-induced airway
hyperreactivity than did CXCR2+/+ mice. In contrast,
CXCR2-deficient mice exhibited significantly less airway
hyperresponsiveness than the wild-type control groups at days 14 and 37
after conidia. At all times after conidia, whole lung levels of IL-4,
IL-5, and eotaxin/CC chemokine ligand 11 were significantly lower in
CXCR2-/- mice than in the wild-type controls. Eosinophil
and T cell, but not neutrophil, recruitment into the airways of
A. fumigatus-sensitized CXCR2-/- mice was
significantly impaired compared with wild-type controls at all times
after the conidia challenge. Whole lung levels of IFN-
, inflammatory
protein-10/CXC ligand (CXCL) 10, and monokine induced by IFN-
(MIG)/CXCL9 were significantly increased in CXCR2-/- mice
compared with CXCR2+/+ mice at various times after conidia.
Interestingly, at day 3 after conidia, neutrophil recruitment and
airway hyperresponsiveness in CXCR2-/- mice was mediated
by inflammatory protein-10/CXCL10 and, to a lesser degree, MIG/CXCL9.
Taken together, these data suggest that CXCR2 contributes to the
persistence of asthmatic disease due to A.
fumigatus.
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