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Serum lysozyme a surrogate marker of pulmonary microvascular injury in smokers?
Linköping University, Department of Medical and Health Sciences, Clinical Physiology. Linköping University, Faculty of Health Sciences. Östergötlands Läns Landsting, Heart and Medicine Center, Department of Clinical Physiology in Linköping.
County Hospital Ryhov, Sweden .
Uppsala University, Sweden .
2013 (English)In: Clinical Physiology and Functional Imaging, ISSN 1475-0961, E-ISSN 1475-097X, Vol. 33, no 4, 307-312 p.Article in journal (Refereed) Published
Abstract [en]

Progression rate of disease processes in smoke-induced lung injuries varies greatly. Diverse pathophysiological mechanisms may trigger these divergences. The aim of this study was to evaluate whether circulating markers of monocytes/macrophages and/or neutrophil [i.e. lysozyme (LZM) or myeloperoxidase (MPO)] were associated with reduced values of diffusion capacity (DL,CO), which is considered to serve as a mirror of pulmonary microvascular derangement and an early sign of tissue remodelling in smokers. Data obtained from 134 smokers (GOLD stage 1) and 24 matched healthy non-smoking volunteers were evaluated in a cross-sectional study design. Lung function tests as well as single breath test of DL,CO were assessed according to ATS/ERS guidelines. Biomarkers were measured in serum by means of sensitive immunoassays. A subgroup of smokers with normal lung function was created to minimize confounding, by excluding datasets showing significant airflow limitation and abnormally high values of carboxy haemoglobin (COHb), the latter indicating recent smoking. The capacity of serum lysozyme to correctly identify abnormally low values of DL,CO (i.e. andlt;1 center dot 9SD units), tended to be higher than that of Myeloperoxidase as assessed by analyses of receiver operated curves (ROC; AUC 0 center dot 81, 95%CI: 0 center dot 690 center dot 89 versus AUC 0 center dot 67, 95%CI: 0 center dot 600 center dot 81). It is concluded that serum levels of lysozyme, reflecting mainly activated monocytes/macrophages but also neutrophils, were significantly associated with isolated decrements of DL,CO in smokers with normal lung function tests. This suggests monocytes/macrophages to have a significant mechanistic role in early phases of the disease process and/or pulmonary microvascular damage.

Place, publisher, year, edition, pages
Wiley-Blackwell , 2013. Vol. 33, no 4, 307-312 p.
Keyword [en]
biomarkers in serum, diffusion capacity, tobacco smokers
National Category
Medical and Health Sciences
URN: urn:nbn:se:liu:diva-94592DOI: 10.1111/cpf.12029ISI: 000319293100010OAI: diva2:633683

Funding Agencies|Futurum the Academy of Healthcare||Jonkopings County Council||FORSS the Medical Research Council of Southeast Sweden||

Available from: 2013-06-27 Created: 2013-06-27 Last updated: 2013-06-27

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Schmekel, Birgitta
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Clinical PhysiologyFaculty of Health SciencesDepartment of Clinical Physiology in Linköping
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Clinical Physiology and Functional Imaging
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