Effects of aerosolized adenosine 5'-triphosphate vs adenosine 5'-monophosphate on dyspnea and airway caliber in healthy nonsmokers and patients with asthma.
OBJECTIVE
Extracellular adenosine 5'-triphosphate (ATP) causes neurogenic bronchoconstriction, inflammation, and coughs, and may play a mechanistic role in obstructive airway diseases. The aims of this study were to determine the effects of inhaled ATP on airway function, and to compare these effects with those of adenosine 5'-monophosphate (AMP).


METHODS
Prospective, randomized, double-blind study.


METHODS
Clinical research laboratory of a postgraduate teaching hospital.


METHODS
The effects of inhaled equimolar doses of ATP and AMP on airway caliber, perception of dyspnea quantified by the Borg score, and other symptoms were determined in 10 nonsmokers (age 41 +/- 3 years) and 10 patients with asthma (age 39 +/- 3 years) [+/- SEM].


RESULTS
None of the healthy nonsmokers responded to ATP or AMP. All the patients with asthma responded to ATP, and 90% responded to AMP. The geometric mean of the provocative dose causing a 20% fall in FEV1 (PD20) of ATP was 48.7 micromol/mL and that of PD20 AMP was 113.5 micromol/mL in responsive asthmatics (p < 0.05). In asthmatic patients, the percentage change in FEV1 caused by ATP was greater than that caused by AMP (deltaFEV1 ATP = 29% vs deltaFEV1 AMP = 22%, p < 0.05). Borg score increased significantly in asthmatics after ATP (from 0.1 to 3.3, p < 0.01) and after AMP (from 0.2 to 2.5, p < 0.01). This increase was also greater after ATP than AMP in asthma (deltaBorg ATP = 3.2 vs deltaBorg AMP = 2.3, p < 0.05). ATP induced cough in 16 subjects (80%), while AMP induced cough in 8 subjects (40%) [p < 0.05]; in addition, more subjects had throat irritation after inhalation of ATP than AMP (p < 0.05).


CONCLUSIONS
ATP is a more potent bronchoconstrictor and has greater effects on dyspnea and other symptoms than AMP in asthmatic patients. Therefore, ATP could potentially be used as a bronchoprovocator in the clinical setting.
Basoglu
Ozen K
OK
Section of Airway Disease, National Heart & Lung Institute, Faculty of Medicine, Imperial College, Dovehouse St, London SW3 6LY, UK.
Pelleg
Amir
A
Essilfie-Quaye
Sarah
S
Brindicci
Caterina
C
Barnes
Peter J
PJ
Kharitonov
Sergei A
SA
D000249:Adenosine Monophosphate / Q000008:administration & dosage / Q000494:pharmacology*; D000255:Adenosine Triphosphate / Q000008:administration & dosage / Q000494:pharmacology*; D000328:Adult; D000336:Aerosols; D001249:Asthma / Q000503:physiopathology*; D004311:Double-Blind Method; D004417:Dyspnea / Q000188:drug therapy* / Q000503:physiopathology*; D005260:Female; D005541:Forced Expiratory Volume; D006801:Humans; D008297:Male; D012016:Reference Values; D012882:Skin Tests; D012907:Smoking / Q000503:physiopathology*
D000336:Aerosols; D000249:Adenosine Monophosphate; D000255:Adenosine Triphosphate