Bronchodilator activity of a nonxanthine phosphodiesterase inhibitor; 2,4-diamino-5-cyano-6-bromopyridine (compound 1)

P. F. Smith, W. J. Thompson, C. de Haen, M. Halonen, J. D. Palmer, David G Johnson

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

The ability of 2,4-diamino-5-cyano-6-bromopyridine (compound 1) to inhibit bronchiolar smooth muscle constriction was examined in isolated rings of rabbit primary bronchi and intrapulmonary bronchioles. After carbachol-induced constriction these tissues were significantly relaxed by either compound 1 or 1-methyl-3-isobutylxanthine (MIX) in a similar dose-dependent manner with 50 to 80% relaxation occurring at 100 μM of either compound. Compound 1 also attenuated the constrictor response of bronchial rings to histamine and significantly reduced the tension generated by horseradish peroxidase in sensitized tissues responding to this antigen. In addition, both compound 1 and MIX were found to inhibit the soluble cyclic AMP phosphodiesterase activity of rabbit bronchioles. Finally, both compound 1 and MIX caused a nearly 2-fold, time-dependent increase in cyclic AMP levels in isolated rabbit intrapulmonary bronchioles. The similarities of both the in vitro tissue responses to these compounds and the phosphodiesterase inhibitory properties suggest that the ability of compound 1 to reduce constrictor-induced tension generation in bronchial smooth muscle is related to the inhibition of cyclic nucleotide phosphodiesterases and the consequent elevation of cyclic AMP.

Original languageEnglish (US)
Pages (from-to)114-119
Number of pages6
JournalJournal of Pharmacology and Experimental Therapeutics
Volume237
Issue number1
StatePublished - 1986
Externally publishedYes

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Bronchioles
1-Methyl-3-isobutylxanthine
Phosphodiesterase Inhibitors
Bronchodilator Agents
Phosphoric Diester Hydrolases
Cyclic AMP
Rabbits
Constriction
Smooth Muscle
Cyclic Nucleotides
Carbachol
Horseradish Peroxidase
Bronchi
Histamine
Antigens
2,4-diamino-5-cyano-6-bromopyridine

ASJC Scopus subject areas

  • Pharmacology

Cite this

Bronchodilator activity of a nonxanthine phosphodiesterase inhibitor; 2,4-diamino-5-cyano-6-bromopyridine (compound 1). / Smith, P. F.; Thompson, W. J.; de Haen, C.; Halonen, M.; Palmer, J. D.; Johnson, David G.

In: Journal of Pharmacology and Experimental Therapeutics, Vol. 237, No. 1, 1986, p. 114-119.

Research output: Contribution to journalArticle

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