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First published online on June 15, 2007
Chest, doi:10.1378/chest.07-0569
doi:10.1378/chest.07-0569
(Chest. 2007; 132:890-899)
© 2007 American College of Chest Physicians
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Overexpression of CD-11b and CXCR1 on Circulating Neutrophils*

Its Possible Role in COPD

Toshiyuki Yamagata, MD, PhD; Hisatoshi Sugiura, MD, PhD; Tomonori Yokoyama, PhD; Satoru Yanagisawa, MD; Tomohiro Ichikawa, MD; Kazuhito Ueshima, MD; Keiichiro Akamatsu, MD, PhD; Tsunahiko Hirano, MD, PhD; Masanori Nakanishi, MD, PhD; Yuko Yamagata, MD, PhD; Kazuto Matsunaga, MD, PhD; Yoshiaki Minakata, MD, PhD and Masakazu Ichinose, MD, PhD

* From the Third Department of Internal Medicine, Wakayama Medical University, School of Medicine, Wakayama, Japan.

Correspondence to: Masakazu Ichinose, MD, PhD, Professor and Chairman, Third Department of Internal Medicine, Wakayama Medical University, School of Medicine, 811–1 Kimiidera, Wakayama 641-8509, Japan; e-mail: masakazu{at}wakayama-med.ac.jp

Abstract

Background: It has been shown that the ß2-integrin molecule is up-regulated in circulating neutrophils in COPD subjects. However, little has been reported about the expression of the cell surface molecules in such patients and their relationship with pulmonary function. The aim of the present study was to investigate the surface expression of molecules in circulating neutrophils and to clarify their possible role in the airflow limitation of COPD.

Methods: The surface expression of Mac-1 cells (ie, CD-11b and CD-18 cells) and CXC chemokine receptor (CXCR) 1 and CXCR2 of circulating neutrophils obtained from COPD patients and healthy subjects (HSs) was measured by flow cytometry analysis. The serum levels of interleukin (IL)-8 were measured by enzyme-linked immunosorbent assay.

Results: Both CD-11b and CXCR1 expression were significantly higher in COPD patients than in HSs (mean [± SE] CD-11b concentration: HSs, 9.7 ± 1.0; COPD patients, 14.2 ± 1.8 [p < 0.05]; mean CXCR1 concentration: HSs, 9.6 ± 0.5; COPD patients, 11.9 ± 0.4 [p < 0.01]). Although aging was positively correlated with the expression of CXCR1 (r = 0.440; p < 0.01), none of the other background factors, including smoking and body mass index, showed a correlation with the expression of the molecules. Although serum IL-8 levels were higher in patients with COPD than in HSs, no significant correlation between serum IL-8 levels and the expression of any molecule was seen. The expression of CD-11b (r = –0.317) and CXCR1 (r = –0.383) showed a significant negative correlation with the severity of airflow limitation (both p < 0.05).

Conclusions: The overexpression of CD-11b and CXCR1 in circulating neutrophils may be associated with the development of airflow limitation in COPD patients.

Key Words: ß2-integrin • chemokine receptor • COPD • interleukin-8 • neutrophil






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