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Departments of
*
Medicine and
Pathology, University of Washington, Seattle, WA 98195; and
Department of Immunology, Immunex Research and Development Corporation, Seattle, WA 98101
In vitro and in vivo studies, in both animal models and human asthmatics, have implicated IL-4 as an important inflammatory mediator in asthma. In a murine asthma model, we examined the anti-inflammatory activities of soluble IL-4R (sIL-4R). In this model, mice sensitized to OVA by i.p. and intranasal (i.n.) routes are challenged with the allergen by i.n. administration. The OVA challenge elicits an eosinophil infiltration into the lungs, with widespread mucus occlusion of the airways, and results in bronchial hyperreactivity. sIL-4R (0.1–100 µg) was administered by either i.n. or i.p. routes before OVA challenge in OVA-sensitized mice. Both blood and bronchoalveolar lavage fluid levels of sIL-4R were significantly elevated compared with controls by i.n. delivery of 100 µg sIL-4R; i.p. delivery of 100 µg sIL-4R only raised blood levels of sIL-4R. The i.n. administration of 100 µg sIL-4R before allergen challenge significantly reduced late phase pulmonary inflammation, blocking airway eosinophil infiltration, VCAM-1 expression, and mucus hypersecretion. In contrast, i.p. delivery of 100 µg sIL-4R inhibited only the influx of eosinophils into the lungs, but not airway mucus release. Furthermore, sIL-4R treatment by either i.n. or i.p. routes did not reduce airway hyperreactivity in response to methacholine challenge. Thus, elevating airway levels of sIL-4R through the administration of exogenous sIL-4R is effective in blocking the late phase pulmonary inflammation that occurs in this murine allergen-challenge asthma model. These results suggest that sIL-4R may have beneficial anti-inflammatory effects in asthmatic patients.
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