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Eur Respir J 2000; 15:886-890
Copyright ©ERS Journals Ltd 2000

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Original Articles

Airways inflammation in chronic bronchitis: the effects of smoking and alpha1-antitrypsin deficiency

AT Hill, DL Bayley, EJ Campbell, SL Hill, and RA Stockley

Airways inflammation in chronic bronchitis is thought predominantly to be a direct consequence of neutrophil recruitment and release of elastase in response to factors such as cigarette smoke. The aims of this study were to assess the role of smoking and determine whether the serum elastase inhibitor alpha1-antitrypsin (alpha1AT) influenced the process. Airways inflammation was compared between patients with chronic obstructive bronchitis with (n=39) and without (n=42) severe alpha1AT deficiency. The authors assessed the sputum concentration of the neutrophil chemoattractants interleukin-8 (IL-8) and leukotriene (LT)B4, myeloperoxidase (MPO) as a marker of neutrophil influx, neutrophil elastase activity and its natural inhibitors, alpha1AT and secretory leukoprotease inhibitor (SLPI). Finally serum alpha1AT was measured to determine the degree of protein leakage (sputum sol serum alpha1AT ratio). Compared to current smokers, the exsmokers had a lower concentration of the chemoattractant IL-8 (p<0.05) and a lower MPO concentration, although this failed to reach conventional statistical significance (p=0.06). Patients with alpha1AT deficiency had greater inflammation in the larger airways with increased LTB4 (p<0.005), MPO (p<0.001), neutrophil elastase activity (p<0.01), protein leak (p<0.001), and were found to have a lower anti-proteinase screen with both reduced sputum alpha1AT (p<0.001) and SLPI concentrations (p<0.05). The reduction in sputum interleukin-8 levels in exsmokers may decrease neutrophil influx and thus explain the slower rate of neutrophil mediated progression of lung disease compared to subjects who continue to smoke. Patients with alpha1-antitrypsin deficiency had greater inflammation suggesting that alpha1-antitrypsin plays an important role in protecting the larger airways from the inflammatory effects of elastase activity and may explain their more rapid progression of disease.


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