Published ahead of print on March 23, 2006, doi:10.1164/rccm.200510-1659PP
Am. J. Respir. Crit. Care Med., Volume 174, Number 1, July 2006, 6-14
A more recent version of this article appeared on July 1, 2006
Submitted on October 24, 2005
Accepted on March 23, 2006
Pulmonary Biomarkers in COPD
Peter J Barnes1*, Badrul Chowdhury2, Sergei A Kharitonov1, Helgo Magnussen3, Clive P Page4, Dirkje Postma5, and Marina Saetta6
1 National Heart and Lung Institute, Imperial College, London, United Kingdom,
2 US Food and Drug Administration, Rockville, MD, USA,
3 Center for Pneumology and Thoracic Surgery, Grosshansdorf, Germany,
4 GKT School of Biomedical Sciences, Kings College, London, United Kingdom,
5 University Hospital Groningen, Groningen, The Netherlands,
6 Department of Cardiothoracic and Vascular Sciences, University of Padova, Padova, Italy
* To whom correspondence should be addressed. E-mail: p.j.barnes{at}imperial.ac.uk.
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 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 is 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 non-invasive procedures so that 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, induced sputum, exhaled nitric oxide, exhaled breath condensate
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