Increased circulating endothelial microparticles in COPD patients: A potential biomarker for COPD exacerbation susceptibility

Toru Takahashi, Seiichi Kobayashi, Naoya Fujino, Takaya Suzuki, Chiharu Ota, Mei He, Mitsuhiro Yamada, Satoshi Suzuki, Masaru Yanai, Shin Kurosawa, Mutsuo Yamaya, Hiroshi Kubo

Research output: Contribution to journalArticle

64 Citations (Scopus)

Abstract

Rationale: The influence of COPD exacerbation on the endothelium is not completely understood. Circulating endothelial microparticles (EMPs) are membrane vesicles in circulating blood that are shed by activated or apoptotic endothelial cells. Objective: To compare EMP numbers in stable COPD patients with those during and after exacerbation. Methods: We examined the EMP numbers in 80 stable COPD patients, 27 patients with exacerbated COPD, and 20 healthy non-COPD volunteers. EMPs were defined as CD144+ MPs (VE-cadherin EMPs), CD31+/CD41- MPs (PECAM EMPs), CD146 MPs (MCAM EMPs) and CD62E + EMPs (E-selectin EMPs) as analysed by FACS. Von Willebrand factor (vWF) expression was utilised to identify the origins of the EMPs. Results: VE-cadherin, PECAM and E-selectin EMP numbers were significantly higher in the stable COPD patients than in the non-COPD volunteers, and they were significantly higher in the patients with exacerbated COPD than in the stable COPD patients. The majority of these increased EMPs were vWF-negative, indicating a pulmonary capillary origin. Baseline E-selectin EMP levels were significantly higher in COPD patients who experienced frequent exacerbations than in those who did not have frequent exacerbations (p<0.001). Twenty-eight days after the onset of exacerbation, E-selectin EMP levels returned to those observed in stable COPD patients, whereas PECAM EMP levels remained high. MCAM EMP numbers were not elevated in stable or exacerbated-COPD patients. Conclusions: Endothelial damage, mainly in pulmonary capillaries, occurs during exacerbation and continues even after clinical symptoms disappear. Higher baseline E-selectin EMP levels may indicate COPD patients who are susceptible to exacerbation.

Original languageEnglish
Pages (from-to)1067-1074
Number of pages8
JournalThorax
Volume67
Issue number12
DOIs
Publication statusPublished - 2012 Dec

ASJC Scopus subject areas

  • Pulmonary and Respiratory Medicine

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