Reduced rhinovirus-specific antibodies are associated with acute exacerbations of chronic obstructive pulmonary disease requiring hospitalisation

Springer Science and Business Media LLC - Tập 12 Số 1 - 2012
Stephanie T. Yerkovich1, Belinda Hales2, Melanie L. Carroll1, Julie G. Burel1, Michelle Towers1, Daniel Smith1, Wayne R. Thomas2, John W. Upham3
1School of Medicine, The University of Queensland, Brisbane, Australia
2Telethon Institute for Child Health Research, Centre for Child Health Research, University of Western Australia, Perth, Australia
3Department of Respiratory Medicine, Princess Alexandra Hospital, Brisbane, Australia

Tóm tắt

Abstract Background Acute exacerbations of chronic obstructive pulmonary disease (AECOPD) are often linked to respiratory infections. However, it is unknown if COPD patients who experience frequent exacerbations have impaired humoral immunity. The aim of this study was to determine if antibodies specific for common respiratory pathogens are associated with AECOPD. Methods Plasma was obtained from COPD patients when clinically stable. AECOPD requiring hospitalisation were recorded. IgG1 antibodies to H. Influenzae outer membrane protein 6 (P6), pneumococcal surface protein C (PspC) and the VP1 viral capsid protein of rhinovirus were measured. Results COPD patients who had an AECOPD (n = 32) had significantly lower anti-VP1 IgG1 antibody levels when stable compared to COPD patients who did not have an AECOPD (n = 28, p = 0.024). Furthermore, the number of hospitalisations was inversely proportional to anti-VP1 antibody levels (r = −0.331, p = 0.011). In contrast, antibodies specific for P6 and PspC were present at similar concentrations between groups. Plasma IL-21, a cytokine important for B-cell development and antibody synthesis, was also lower in COPD patients who had an AECOPD, than in stable COPD patients (p = 0.046). Conclusion Deficient humoral immunity specific for rhinoviruses is associated with AECOPD requiring hospitalisation, and may partly explain why some COPD patients have an increased exacerbation risk following respiratory viral infections.

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