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Published ahead of print on March 23, 2006, doi:10.1164/rccm.200510-1659PP
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American Journal of Respiratory and Critical Care Medicine Vol 174. pp. 6-14, (2006)
© 2006 American Thoracic Society
doi: 10.1164/rccm.200510-1659PP

Pulmonary Perspective

Pulmonary Biomarkers in Chronic Obstructive Pulmonary Disease

Peter J. Barnes, Badrul Chowdhury, Sergei A. Kharitonov, Helgo Magnussen, Clive P. Page, Dirkje Postma and Marina Saetta

National Heart and Lung Institute, Imperial College; Guy's, King's, and St Thomas' School of Biomedical Sciences, Kings College London, London, United Kingdom; United States Food and Drug Administration, Rockville, Maryland; Center for Pneumology and Thoracic Surgery, Grosshansdorf, Germany; University Hospital Groningen, Groningen, The Netherlands; and Department of Cardiothoracic and Vascular Sciences, University of Padova, Padova, Italy

Correspondence and requests for reprints should be addressed to Professor Peter J. Barnes, National Heart and Lung Institute, Imperial College London, Dovehouse Street, London SW3 6LY, UK. E-mail: p.j.barnes{at}imperial.ac.uk

ABSTRACT

There has been increasing interest in using pulmonary biomarkers to understand and monitor the inflammation in the respiratory tract of patients with chronic obstructive pulmonary disease (COPD). In this Pulmonary Perspective we discuss the merits of the various approaches by reviewing the current literature on pulmonary biomarkers in COPD and underscore the need for more systematic studies in the future. Bronchial biopsies and bronchoalveolar lavage provide valuable information about inflammatory cells and mediators, but are invasive, so that repeated measurements have to be very limited in assessing any interventions. Induced sputum has provided considerable information about the inflammatory process, including mediators and proteinases in COPD, but selectively samples proximal airways and may not closely reflect distal inflammatory processes. Exhaled gases and breath condensate are noninvasive procedures, so repeated measurements are possible, but for some assays the variability is relatively high. There is relatively little information about how any of these biomarkers relate to other clinical outcomes, such as progression of the disease, severity of disease, clinical subtypes, or response to therapy. More information is also needed about the variability in these measurements. In the future, pulmonary biomarkers may be useful in predicting disease progression, indicating disease instability, and in predicting response to current therapies and novel therapies, many of which are now in development.

Key Words: bronchial biopsy • bronchoalveolar lavage • exhaled breath condensate • exhaled nitric oxide • induced sputum




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