Interleukin-6 and interleukin-8 blood levels’ poor association with the severity and clinical profile of ex-smokers with COPD
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Data
2014
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Resumo
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/m 2 , 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.
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Palavras-chave
COPD, C-reactive protein, Interleukin-6, Interleukin-8
Citação
MORAES, Maria Rosedália de et al. Interleukin-6 and interleukin-8 blood levels’ poor association with the severity and clinical profile of ex-smokers with COPD. International Journal of Chronic Obstructive Pulmonary Disease, Auckland, v. 9, p. 735-743, 2014.