International Journal of COPD (Dec 2023)

Sputum Biomarkers in Wood and Tobacco Smoke Etiotypes of Chronic Obstructive Pulmonary Disease

  • Giraldo-Montoya ÁM,
  • Torres-Duque CA,
  • Giraldo-Cadavid LF,
  • Laucho-Contreras ME,
  • González-Flórez A,
  • Santos AM,
  • Tuta-Quintero EA,
  • Celli BR,
  • González-García M

Journal volume & issue
Vol. Volume 19
pp. 1 – 10

Abstract

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Ángela María Giraldo-Montoya,1,2,* Carlos A Torres-Duque,1,3,* Luis F Giraldo-Cadavid,4,5 Maria E Laucho-Contreras,1 Angélica González-Flórez,1 Ana María Santos,3 Eduardo A Tuta-Quintero,1,5 Bartolomé R Celli,6 Mauricio González-García1,7 1CINEUMO, Research Center, Fundación Neumológica Colombiana, Bogotá, Colombia; 2School of Medicine, Universidad Tecnológica de Pereira, Pereira, Colombia; 3Biosciences Doctoral, Universidad de La Sabana, Chía, Colombia; 4Medical Department, Fundación Neumológica Colombiana, Bogotá, Colombia; 5Epidemiology and Biostatistics Department, Universidad de La Sabana, Chía, Colombia; 6Harvard Medical School, Boston, MA, USA; 7School of Medicine, Universidad de La Sabana, Chía, Colombia*These authors contributed equally to this workCorrespondence: Carlos A Torres-Duque, Research Department, Fundación Neumológica Colombiana, Bogotá, Colombia, Biosciences Doctoral, Universidad de La Sabana, Chía, Colombia, Email [email protected]: There is a need to better understand the etiotypes of chronic obstructive pulmonary disease (COPD) beyond the tobacco-smoke (TS-COPD). Wood smoke COPD (WS-COPD) is characterized by greater airway compromise, milder emphysema, and slower rate of lung function decline than TS-COPD. However, it is unclear if these two etiotypes of COPD have differences in sputum biomarker concentrations. Objective was to compare sputum levels of selected sputum biomarkers between WS-COPD and TS-COPD, and healthy controls.Methods: Eighty-eight women (69± 12 years) were recruited and classified into: WS-COPD (n=31), TS-COPD (n=29) and controls (n=28). Using ELISA, we determined induced sputum levels of metalloproteinase 9 (MMP-9), chemokine ligand 5 (CCL5), interleukin-8 (IL-8), chemokine ligand 16 (CCL16/HCC-4) and vascular endothelial growth factor (VEGF-1). Differences were analyzed by Kruskal–Wallis and Mann–Whitney-U tests and correlation between airflow limitation and biomarkers by Spearman’s test.Results: At similar degree of airflow obstruction, anthropometrics and medications use, the level of sputum CCL5 was higher in TS-COPD than WS-COPD (p=0.03) without differences in MMP-9, IL-8, CCL16/HCC-4, and VEGF-1. Women with WS-COPD and TS-COPD showed significantly higher sputum levels of MMP-9, IL-8 and CCL5 compared with controls (p< 0.001). FEV1% predicted correlated negatively with levels of MMP-9 (rho:-0.26; P=0.016), CCL5 (rho:-0.37; P=0.001), IL-8 (rho:-0.42; P< 0.001) and VEGF (rho:-0.22; P=0.04).Conclusion: While sputum concentrations of MMP-9, IL-8, and CCL5 were higher in COPD women compared with controls, women with TS-COPD had higher levels of CCL5 compared with those with WS-COPD. Whether this finding relates to differences in pathobiological pathways remains to be determined.Keywords: COPD, wood smoke, biomass fuels, tobacco smoke, biomarkers, sputum, cytokines

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