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Infection and Immunity, November 2005, p. 7525-7534, Vol. 73, No. 11
0019-9567/05/$08.00+0     doi:10.1128/IAI.73.11.7525-7534.2005
Copyright © 2005, American Society for Microbiology. All Rights Reserved.

Bordetella bronchiseptica Flagellin Is a Proinflammatory Determinant for Airway Epithelial Cells

Yolanda S. López-Boado,^1,2* Laura M. Cobb,¹ and Rajendar Deora^2*

Section on Molecular Medicine, Department of Internal Medicine,¹ Department of Microbiology and Immunology, Wake Forest University School of Medicine, Winston-Salem, North Carolina 27157²

Received 26 April 2005/ Returned for modification 4 June 2005/ Accepted 1 August 2005

Motility is an important virulence phenotype for many bacteria, and flagellin, the monomeric component of flagella, is a potent proinflammatory factor. Of the three Bordetella species, Bordetella pertussis and Bordetella parapertussis are nonmotile human pathogens, while Bordetella bronchiseptica expresses flagellin and causes disease in animals and immunocompromised human hosts. The BvgAS two-component signal transduction system regulates phenotypic-phase transition (Bvg⁺, Bvg^–, and Bvgⁱ) in bordetellae. The Bvg^– phase of B. bronchiseptica is characterized by the expression of flagellin and the repression of adhesins and toxins necessary for the colonization of the respiratory tract. B. bronchiseptica naturally infects a variety of animal hosts and constitutes an excellent model to study Bordetella pathogenesis. Using in vitro coculture models of bacteria and human lung epithelial cells, we studied the effects of B. bronchiseptica flagellin on host defense responses. Our results show that B. bronchiseptica flagellin is a potent proinflammatory factor that induces chemokine, cytokine, and host defense gene expression. Furthermore, we investigated receptor specificity in the response to B. bronchiseptica flagellin. Our results show that B. bronchiseptica flagellin is able to signal effectively through both human and mouse Toll-like receptor 5.

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* Corresponding author. Mailing address for Yolanda S. López-Boado: Section on Molecular Medicine, Department of Internal Medicine, Wake Forest University School of Medicine, Winston-Salem, NC 27157. Phone: (336) 716-9923. Fax: (336) 716-1214. E-mail: ysanchez{at}wfubmc.edu. Mailing address for Rajendar Deora: Department of Microbiology and Immunology, Wake Forest University School of Medicine, Winston-Salem, NC 27157. Phone: (336) 716-1124. Fax: (336) 716-9928. E-mail: rdeora{at}wfubmc.edu.

Editor: F. C. Fang

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Infection and Immunity, November 2005, p. 7525-7534, Vol. 73, No. 11
0019-9567/05/$08.00+0     doi:10.1128/IAI.73.11.7525-7534.2005
Copyright © 2005, American Society for Microbiology. All Rights Reserved.

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