Published ahead of print on February 24, 2005, doi:10.1165/rcmb.2004-0269OC
American Journal of Respiratory Cell and Molecular Biology. Vol. 32, pp. 428-435, 2005
© 2005 American Thoracic Society DOI: 10.1165/rcmb.2004-0269OC
Expression and Regulation of Small Proline-Rich Protein 2 in Allergic Inflammation
Nives Zimmermann,
Matthew P. Doepker,
David P. Witte,
Keith F. Stringer,
Patricia C. Fulkerson,
Samuel M. Pope,
Eric B. Brandt,
Anil Mishra,
Nina E. King,
Nikolaos M. Nikolaidis,
Marsha Wills-Karp,
Fred D. Finkelman and
Marc E. Rothenberg
Divisions of Allergy and Immunology, Pathology, and Immunobiology, Department of Pediatrics, Cincinnati Children's Hospital Medical Center and University of Cincinnati College of Medicine; Division of Immunology, Department of Internal Medicine, University of Cincinnati College of Medicine; and the Veteran's Administration Medical Center, Cincinnati, Ohio
Correspondence and requests for reprints should be addressed to Marc Rothenberg, M.D., Ph.D., Division of Allergy and Immunology, Cincinnati Children's Hospital Medical Center, 3333 Burnet Avenue, Cincinnati, OH 45229. E-mail: Rothenberg{at}cchmc.org
Asthma is a complex inflammatory pulmonary disorder that is on the rise despite intense ongoing research. We aimed to elucidate novel pathways involved in the pathogenesis of asthma. Employing asthma models induced by different allergens (ovalbumin and Aspergillus fumigatus), we uncovered the involvement of two members of the small proline-rich protein (SPRR) family, SPRR2a and SPRR2b, known to be involved in epithelial differentiation but not allergic disease. In situ hybridization revealed induction of SPRR2 signal in a subset of bronchial epithelial cells and mononuclear cells associated with inflammation after allergen challenge. Allergen-induced SPRR2 mRNA accumulation in the lung occurred in a time-dependent manner, with peak expression 1096 h after a second ovalbumin challenge. Transgenic overexpression of interleukin (IL)-13 in the lungs resulted in a marked increase of SPRR2 expression, and allergen-induced SPRR2 expression was significantly decreased in IL-13deficient mice. Studies in gene-targeted mice revealed that allergen-induced SPRR2 was dependent upon STAT6. Finally, we aimed to determine if the induction of SPRR2 by allergen was tissue specific. Notably, SPRR2 was markedly increased in the small intestine after induction of allergic gastrointestinal inflammation. Thus, SPRR2 is an allergen- and IL-13induced gene in experimental allergic responses that may be involved in disease pathophysiology.
Key Words: asthma allergy small proline-rich protein
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