The effect of anticholinergic and beta-agonist pretreatment on bronchoconstriction induced by N-formyl-methionyl-leucyl-phenylalanine.
N-Formyl-methionyl-leucyl-phenylalanine (FMLP), an acylated tripeptide bacterial neutrophil chemotactic factor, has been shown to be a bronchoconstrictor by inhalation in man in vivo. It thus has a putative role in the generation of bronchoconstriction associated with bacterial bronchial infection. We have investigated the effect of pretreatment with the anticholinergic agent, ipratropium bromide (IB), and the beta 2-agonist, fenoterol (F), on FMLP-induced bronchoconstriction. Ten non-asthmatic subjects aged 21-28 yrs performed dose-response curves to nebulized FMLP on 3 study days after pretreatment with saline, F or IB. Amongst the 8 subjects who bronchoconstricted by 20% to FMLP there was a significant increase in the provocative concentration causing a 20% fall in forced expiratory volume in one second (FEV1) (PC20FMLP) after both IB and F. F was significantly better than IB. When comparison was made using absolute fall in FEV1 and including all 10 subjects the same results were found. Partial inhibition of FMLP-induced bronchoconstriction by IB suggests that part of the effect of FMLP is vagally mediated. We suggest that F is acting via modulation of FMLP-induced rises in intracellular free calcium.
Peters
M J
MJ
Department of Thoracic Medicine, Concord Hospital, Sydney, Australia.
Breslin
A B
AB
Berend
N
N
D000328:Adult; D001286:Atropine Derivatives / Q000627:therapeutic use*; D001985:Bronchial Provocation Tests; D001986:Bronchial Spasm / Q000139:chemically induced* / Q000517:prevention & control; D004305:Dose-Response Relationship, Drug; D005280:Fenoterol / Q000627:therapeutic use*; D005541:Forced Expiratory Volume / Q000187:drug effects; D006801:Humans; D009241:Ipratropium / Q000627:therapeutic use*; D009240:N-Formylmethionine Leucyl-Phenylalanine; D011292:Premedication
D001286:Atropine Derivatives; D005280:Fenoterol; D009240:N-Formylmethionine Leucyl-Phenylalanine; D009241:Ipratropium