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J. Exp. Med.,
Volume 187, Number 9, May 4, 1998 1537-1542
By


From the * New Product Research Laboratories IV, Daiichi Pharmaceutical Co., Ltd., 1-16-13 Kitakasai, Edogawa, Tokyo 134, Japan; and the Signal transducers and activators of transcription 6 (STAT6) is essential for interleukin 4-mediated responses, including class switching to IgE and induction of type 2 T helper cells. To investigate the role of STAT6 in allergic asthma in vivo, we developed a murine model of allergen-induced airway inflammation. Repeated exposure of actively immunized C57BL/6 mice
to ovalbumin (OVA) aerosol increased the level of serum IgE, the number of eosinophils in
bronchoalveolar lavage (BAL) fluid, and airway reactivity. Histological analysis revealed peribronchial inflammation with pulmonary eosinophilia in OVA-treated mice. In STAT6-deficient (STAT6
Department of Biochemistry, Hyogo College of
Medicine, 1-1 Mukogawa, Nishinomiya, Hyogo 663, Japan
/
) C57BL/6 mice treated in the same fashion, there were no eosinophilia in
BAL and significantly less peribronchial inflammation than in wild-type mice. Moreover
STAT6
/
mice had much less airway reactivity than wild-type mice. These findings suggest
that STAT6 plays a crucial role in the pathogenesis of allergen-induced airway inflammation.
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