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From the * Division of Basic Sciences and Pulmonary Medicine, Mast cells are the main effector cells of immediate hypersensitivity and anaphylaxis. Their role
in the development of allergen-induced airway hyperresponsiveness (AHR) is controversial
and based on indirect evidence. To address these issues, mast cell-deficient mice (W/W v) and
their congenic littermates were sensitized to ovalbumin (OVA) by intraperitoneal injection and
subsequently challenged with OVA via the airways. Comparison of OVA-specific immunoglobulin E (IgE) levels in the serum and numbers of eosinophils in bronchoalveolar lavage fluid or
lung digests showed no differences between the two groups of mice. Further, measurements of
airway resistance and dynamic compliance at baseline and after inhalation of methacholine were similar. These data indicate that mast cells or IgE-mast cell activation is not required for
the development of eosinophilic inflammation and AHR in mice sensitized to allergen via the
intraperitoneal route and challenged via the airways.
Department of Medicine, National Jewish Medical and Research Center, Denver, Colorado; and § The
Jackson Laboratory, Bar Harbor, Maine
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