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Interleukin-6 and interleukin-8 blood levels’ poor association with the severity and clinical profile of ex-smokers with COPD

Authors de Moraes MR, Castro da Costa A, Sousa Corrêa K, Junqueira-Kipnis AP, Rabahi M

Received 15 March 2014

Accepted for publication 12 May 2014

Published 29 July 2014 Volume 2014:9(1) Pages 735—743

DOI https://doi.org/10.2147/COPD.S64135

Checked for plagiarism Yes

Review by Single-blind

Peer reviewer comments 3

Maria Rosedália de Moraes,1 Adeliane Castro da Costa,2 Krislainy de Sousa Corrêa,2 Ana Paula Junqueira-Kipnis,2 Marcelo Fouad Rabahi3

1Health Sciences of Federal University of Goiás, 2Institute of Tropical Pathology and Public Health, Federal University of Goiás, Goiânia, Goiás, Brazil; 3Faculty of Medicine, Federal University of Goiás, Goiânia, Goiás, Brazil

Background: The role of interleukins in the severity and clinical profile of chronic obstructive pulmonary disease (COPD) is not known, but evidence supports the contribution of systemic inflammation to disease pathophysiology. This study evaluated the relationship of serum biomarkers to the severity and clinical parameters of COPD.
Methods and findings: Serum levels of high-sensitivity C-reactive protein, interleukin-6 (IL-6), and interleukin-8 (IL-8) were measured in 50 patients with stable COPD and in 16 controls. The levels of these biomarkers were compared with parameters of severity, such as the grading of flow obstruction using the recommendations of the Global initiative for chronic Obstructive Lung Disease, the BMI (body mass index), obstruction, dyspnea, exercise capacity (health index) index, the number of exacerbations within the last year, and peripheral oxygen saturation after the six-minute walk test, and with clinical parameters, such as bronchitis and non-bronchitis phenotypes, the number of associated comorbidities, and the smoking burden. COPD patients exhibited higher levels of IL-6 and IL-8 compared to the control group. Higher levels of IL-6 occurred in COPD groups with body mass index <21 kg/m2, with more than two exacerbations in the past year, with a higher smoking burden, and with bronchitis. The increase in serum IL-8 was found only in the group with the highest number of exacerbations within the previous year.
Conclusion: Increased IL-6 was mainly associated with smoking burden, in patients who had smoked for more than 30 pack-years and exhibited a bronchitis phenotype. No direct association was observed for both IL-6 and IL-8 blood levels with the severity of COPD in ex-smokers.

Keywords: COPD, interleukin-6, interleukin-8, C-reactive protein

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