title: [The levels and clinical implications of induced sputum interleukin-17 in chronic obstructive pulmonary disease and asthma].
abstract: OBJECTIVE
  The study aims to investigate the changes of interleukin (IL)-17 in induced sputum, and to observe the correlation between concentrations of IL-17 and the number of inflammatory cells in induced sputum in chronic obstructive pulmonary disease (COPD) and in asthma.
  
  
  METHODS
  Induced sputum was obtained in patients with COPD both during acute exacerbation and stable stage and in asthma during acute attack. Healthy nonsmoking volunteers were included as controls. The concentrations of IL-17 in induced sputum were measured by enzyme-linked immunosorbent assay.
  
  
  RESULTS
  The concentrations of IL-17 both in patients with COPD during acute exacerbation and with asthma were significantly higher than that in the control subjects (P < 0.001). The levels of IL-17 in patients with COPD during acute exacerbation positively correlated with that of IL-8 (r = 0.381, P = 0.038) and with the percentage of neutrophils (r = 0.446, P = 0.010) respectively. There was also a positive correlation between the concentrations of IL-17 and the numbers of eosinophils in patients with asthma.
  
  
  CONCLUSIONS
  The concentrations of IL-17 in patients with acute exacerbation of COPD and in patients with asthma were significantly increased. IL-17 may play a role in the airway inflammation in both COPD and asthma.
authors.affiliation: Department of Respiratory Medicine, Third Hospital, Peking University, Beijing 100083, China.
authors.forename: Feng
authors.initials: F
authors.lastname: Shen
authors.forename: Ming-wu
authors.initials: MW
authors.lastname: Zhao
authors.forename: Bei
authors.initials: B
authors.lastname: He
authors.forename: Yu-zhu
authors.initials: YZ
authors.lastname: Wang
authors.forename: Wan-zhen
authors.initials: WZ
authors.lastname: Yao
mesh_terms: D000328:Adult; D000368:Aged; D001249:Asthma / Q000378:metabolism*; D005260:Female; D006801:Humans; D020381:Interleukin-17 / Q000032:analysis*; D015850:Interleukin-6 / Q000032:analysis; D016209:Interleukin-8 / Q000032:analysis; D007958:Leukocyte Count; D008173:Lung Diseases, Obstructive / Q000378:metabolism*; D008297:Male; D008875:Middle Aged; D013183:Sputum / Q000737:chemistry* / Q000166:cytology
chemical_list: D020381:Interleukin-17; D015850:Interleukin-6; D016209:Interleukin-8