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Title
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Smoking status and anti-inflammatory macrophages in bronchoalveolar lavage and induced sputum in COPD
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Author
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Institution/Organisation
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Groningen Leiden Univ Corticostero
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Abstract
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| Background: Macrophages have been implicated in the pathogenesis of COPD. M1 and M2 macrophages constitute subpopulations displaying pro-and anti-inflammatory properties. We hypothesized that smoking cessation affects macrophage heterogeneity in the lung of patients with COPD. Our aim was to study macrophage heterogeneity using the M2-marker CD163 and selected pro-and anti-inflammatory mediators in bronchoalveolar lavage (BAL) fluid and induced sputum from current smokers and ex-smokers with COPD. Methods: 114 COPD patients (72 current smokers; 42 ex-smokers, median smoking cessation 3.5 years) were studied cross-sectionally and underwent sputum induction (M/F 99/15, age 62 +/- 8 [mean +/- SD] years, 42 (31-55) [median (range)] packyears, post-bronchodilator FEV1 63 +/- 9% predicted, no steroids past 6 months). BAL was collected from 71 patients. CD163(+) macrophages were quantified in BAL and sputum cytospins. Pro-and anti-inflammatory mediators were measured in BAL and sputum supernatants. Results: Ex-smokers with COPD had a higher percentage, but lower number of CD163(+) macrophages in BAL than current smokers (83.5% and 68.0%, p = 0.04; 5.6 and 20.1 x 10(4)/ml, p = 0.001 respectively). The percentage CD163(+) M2 macrophages was higher in BAL compared to sputum (74.0% and 30.3%, p < 0.001). BAL M-CSF levels were higher in smokers than ex-smokers (571 pg/ml and 150 pg/ml, p = 0.001) and correlated with the number of CD163(+) BAL macrophages (Rs = 0.38, p = 0.003). No significant differences were found between smokers and ex-smokers in the levels of pro-inflammatory (IL-6 and IL-8), and anti-inflammatory (elafin, and Secretory Leukocyte Protease Inhibitor [SLPI]) mediators in BAL and sputum. Conclusions: Our data suggest that smoking cessation partially changes the macrophage polarization in vivo in the periphery of the lung towards an anti-inflammatory phenotype, which is not accompanied by a decrease in inflammatory parameters. |
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Language
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English
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Source (journal)
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Respiratory research. - London
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Publication
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London
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2011
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ISSN
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1465-9921
1465-993X
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DOI
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10.1186/1465-9921-12-34
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Volume/pages
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12
(2011)
, p. 1-9
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Article Reference
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34
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ISI
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000289299700001
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Pubmed ID
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21426578
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Medium
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E-only publicatie
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Full text (Publisher's DOI)
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