Inhibition of allergen-induced pulmonary responses by the selective tryptase inhibitor 1,5-bis-{4-[(3-carbamimidoyl-benzenesulfonylamino)- methyl]-phenoxy}-pentane (AMG-126737)

Clifford D. Wright, Andrew M. Havill, Scot C. Middleton, Mohammed A. Kashem, David J. Dripps, William M. Abraham, David S. Thomson, Laurence E. Burgess

Research output: Contribution to journalArticle

60 Scopus citations


Emerging evidence suggests that mast cell tryptase is a therapeutic target for the treatment of asthma. The effects of this serine protease are associated with both pathophysiologic pulmonary responses and pathologic changes of the asthmatic airway. In this study, the tryptase inhibitor 1,5- bis-{4-[(3-carbamimidoyl-benzenesulfonylamino)-methyl]-phenoxy}-pentane (AMG-126737) was evaluated for its pharmacologic effects against allergen- induced airway responses. AMG-126737 is a potent inhibitor of human lung mast cell tryptase (K(i) = 90 nM), with greater than 10- to 200-fold selectivity versus other serine proteases. Intratracheal administration of AMG-126737 inhibited the development of airway hyperresponsiveness in allergen- challenged guinea pigs with an ED50 of 0.015 mg/kg. In addition, the compound exhibited oral activity in the guinea pig model. The in vivo activity of AMG-126737 was confirmed in a sheep model of allergen-induced airway responses, where the compound inhibited early and late phase bronchoconstriction responses and the development of airway hyperresponsiveness. These results support the proposed role of tryptase in the pathology of asthma and suggest that AMG-126737 has potential therapeutic utility in this pulmonary disorder.

Original languageEnglish
Pages (from-to)1989-1996
Number of pages8
JournalBiochemical Pharmacology
Issue number12
StatePublished - Dec 15 1999
Externally publishedYes



  • AMG-126737
  • Asthma
  • Inhibition
  • Pulmonary responses
  • Tryptase

ASJC Scopus subject areas

  • Pharmacology

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