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Am. J. Respir. Crit. Care Med., Volume 164, Number 8, October 2001, 1508-1513

Increased Expression of Heme Oxygenase (HO)-1 in Alveolar Spaces and HO-2 in Alveolar Walls of Smokers

PIERO MAESTRELLI, ABDUL H. EL MESSLEMANI, ORIETTA DE FINA, YOHANN NOWICKI, MARINA SAETTA, CRISTINA MAPP, and LEONARDO M. FABBRI

Department of Environmental Medicine and Public Health, University of Padua, Padua, Italy; and Section of Respiratory Diseases, University of Modena, Modena, Italy

It has been suggested that oxidative stress protein heme oxygenase (HO)-1 plays a role in chronic airway diseases including chronic obstructive pulmonary disease (COPD). The inducible isoform HO-1 and the constitutive HO-2 catalyze the same reaction. Their distribution in situ was studied in lungs of 10 nonsmoking subjects, 6 healthy smokers, and 10 smokers with COPD. Paraffin-embedded sections of surgical lung specimens were immunostained with antibodies against HO-1 and HO-2. HO-1 immunoreactivity was observed mainly in alveolar macrophages. HO-1-positive macrophages were increased in smokers with COPD (median: 36%) as compared with nonsmoking subjects (13%; p < 0.02), whereas no differences were observed between patients with COPD and healthy smokers (34%). HO-2 had a more widespread distribution in cells of the alveolar wall, in adventitia of pulmonary arteries and bronchioles, and in vascular smooth muscle. Lower percentages of alveolar macrophages exhibited positive staining for HO-2 without significant differences between the three groups. HO-2+ cells in the alveolar wall were increased in smokers with (15/mm) and without COPD (12/mm) as compared with nonsmokers (8/mm, p < 0.01). In conclusion, inducible HO-1 and constitutive HO-2 are detectable in human lung tissue and their expression is increased in smokers, suggesting that oxidative stress due to cigarette smoke may increase lung cells expressing HO-1 and HO-2.




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