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Infection and Immunity, March 2008, p. 888-898, Vol. 76, No. 3
0019-9567/08/$08.00+0     doi:10.1128/IAI.01301-07
Copyright © 2008, American Society for Microbiology. All Rights Reserved.

Host Airway Proteins Interact with Staphylococcus aureus during Early Pneumonia ^,

Division of Infectious Diseases, Center for Childhood Infections and Prematurity Research,¹ Center for Developmental Therapeutics, Seattle Children's Hospital Research Institute, Seattle, Washington,² Departments of Pediatrics,³ Medical Education and Biomedical Informatics,⁴ Medicine, University of Washington School of Medicine, Seattle, Washington,⁵ The BIATECH Institute, Seattle, Washington,⁶ Laboratory of Human Bacterial Pathogenesis, Rocky Mountain Laboratories, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Hamilton, Montana⁷

Received 24 September 2007/ Returned for modification 25 October 2007/ Accepted 8 January 2008

Staphylococcus aureus is a major cause of hospital-acquired pneumonia and is emerging as an important etiological agent of community-acquired pneumonia. Little is known about the specific host-pathogen interactions that occur when S. aureus first enters the airway. A shotgun proteomics approach was utilized to identify the airway proteins associated with S. aureus during the first 6 h of infection. Host proteins eluted from bacteria recovered from the airways of mice 30 min or 6 h following intranasal inoculation under anesthesia were subjected to liquid chromatography and tandem mass spectrometry. A total of 513 host proteins were associated with S. aureus 30 min and/or 6 h postinoculation. A majority of the identified proteins were host cytosolic proteins, suggesting that S. aureus was rapidly internalized by phagocytes in the airway and that significant host cell lysis occurred during early infection. In addition, extracellular matrix and secreted proteins, including fibronectin, antimicrobial peptides, and complement components, were associated with S. aureus at both time points. The interaction of 12 host proteins shown to bind to S. aureus in vitro was demonstrated in vivo for the first time. The association of hemoglobin, which is thought to be the primary staphylococcal iron source during infection, with S. aureus in the airway was validated by immunoblotting. Thus, we used our recently developed S. aureus pneumonia model and shotgun proteomics to validate previous in vitro findings and to identify nearly 500 other proteins that interact with S. aureus in vivo. The data presented here provide novel insights into the host-pathogen interactions that occur when S. aureus enters the airway.

Published ahead of print on 14 January 2008.

Supplemental material for this article may be found at http://iai.asm.org/.

Editor: B. A. McCormick

This article has been cited by other articles:

• Ventura, C. L., Higdon, R., Hohmann, L., Martin, D., Kolker, E., Liggitt, H. D., Skerrett, S. J., Rubens, C. E. (2008). Staphylococcus aureus Elicits Marked Alterations in the Airway Proteome during Early Pneumonia. Infect. Immun. 76: 5862-5872 [Abstract] [Full Text]