title: Adenosine triphosphate in exhaled breath condensate of healthy subjects and patients with chronic obstructive pulmonary disease.
abstract: OBJECTIVE
  The effect of hypoxic relapse of chronic obstructive pulmonary disease (COPD) on lung adenosine triphosphate (ATP) concentration was studied measuring ATP in exhaled breath condensate (EBC).
  
  
  METHODS
  Thirty COPD patients with severe exacerbation, thirteen healthy non-smokers and thirteen healthy smokers.
  
  
  METHODS
  ATP was detected using a luciferin-luciferase assay, dilution of airway droplets in EBC was assessed measuring sample conductivity.
  
  
  RESULTS
  ATP concentrations were similar in COPD patients, non-smoking and smoking healthy individuals (141 +/- 44, 115 +/- 21 and 90 +/- 15 pM; p = 0.66). After treatment oxygenation of COPD patients improved (6.85 +/- 1.29 kPa vs. 8.20 +/- 1.28 kPa, p < 0.001), but EBC ATP concentration was similar to that of admission (p = 0.84). There was no correlation between EBC ATP concentration and airway droplet dilution.
  
  
  CONCLUSIONS
  ATP detected in EBC indicates the presence of ATP in airway lining fluid. Lack of difference in ATP concentration between health and COPD suggests that airway ATP level is under complex control of multiple factors.
authors.affiliation: Department of Pathophysiology, National Korányi Institute for TB and Pulmonology, Budapest, Hungary.
authors.forename: Z
authors.initials: Z
authors.lastname: Lázár
authors.forename: E
authors.initials: E
authors.lastname: Huszár
authors.forename: T
authors.initials: T
authors.lastname: Kullmann
authors.forename: I
authors.initials: I
authors.lastname: Barta
authors.forename: B
authors.initials: B
authors.lastname: Antus
authors.forename: A
authors.initials: A
authors.lastname: Bikov
authors.forename: M
authors.initials: M
authors.lastname: Kollai
authors.forename: I
authors.initials: I
authors.lastname: Horváth
mesh_terms: D000255:Adenosine Triphosphate / Q000378:metabolism*; D000328:Adult; D000368:Aged; D001826:Body Fluids / Q000737:chemistry; D001944:Breath Tests; D045853:Exhalation; D005260:Female; D006801:Humans; D000860:Hypoxia; D008297:Male; D008875:Middle Aged; D029424:Pulmonary Disease, Chronic Obstructive / Q000378:metabolism* / Q000503:physiopathology; D012907:Smoking
chemical_list: D000255:Adenosine Triphosphate