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Infection and Immunity, January 2008, p. 48-55, Vol. 76, No. 1
0019-9567/08/$08.00+0 doi:10.1128/IAI.00980-07
Copyright © 2008, American Society for Microbiology. All Rights Reserved.

The Research Institute at Nationwide Children's Hospital and The Ohio State University College of Medicine, Department of Pediatrics, Center for Microbial Pathogenesis, 700 Children's Drive, W591, Columbus, Ohio 43205,1 Department of Medical Genetics and Microbiology, University of Toronto, 1 King's College Circle, Room 4381, Toronto, Ontario M5S 1A8, Canada,2 College of Public Health and Center for Biostatistics, The Ohio State University, 320 W. 10th Avenue, Columbus, Ohio 432103
Received 18 July 2007/ Returned for modification 23 August 2007/ Accepted 3 October 2007
In vitro studies suggest an important role for CEACAM1 (carcinoembryonic antigen-related cell adhesion molecule 1) in infection by multiple gram-negative bacteria. However, in vivo evidence supporting this role is lacking, largely because the bacterial adhesins involved in this host-microbe association do not bind to murine-derived CEACAM1. One of several adhesins expressed by nontypeable Haemophilus influenzae (NTHI), the outer membrane protein P5-homologous adhesin (or P5), is essential for colonization of the chinchilla nasopharynx and infection of the middle ear. Here we reveal that NTHI P5 binds to the chinchilla homologue of CEACAM1 and that rabbit anti-human carcinoembryonic antigen blocks NTHI colonization of the chinchilla nasopharynx, providing the first demonstration of a role for CEACAM receptor binding by any bacterial pathogen in vivo.
Published ahead of print on 15 October 2007.
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