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Neurokinin receptors subserving bronchoconstriction

J L Ellis1

  • 1Johns Hopkins Asthma and Allergy Center, Baltimore, MD 21224, USA.

Canadian Journal of Physiology and Pharmacology
|July 1, 1995
PubMed
Summary

Selective agonists and antagonists reveal new insights into tachykinin receptor subtypes involved in bronchoconstriction across mammalian species. This research focuses on neurokinin receptor 1 (NK1), NK2, and NK3 roles in airway smooth muscle contraction.

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Area of Science:

  • Pharmacology
  • Respiratory Medicine
  • Neuroscience

Background:

  • Tachykinin receptor subtypes (NK1, NK2, NK3) were initially classified by endogenous ligand potency (substance P, neurokinin A, neurokinin B).
  • Previous classifications relied on relative affinities of natural ligands, leading to potential ambiguities in receptor function.

Purpose of the Study:

  • To review recent advancements in understanding tachykinin receptor subtypes mediating bronchoconstriction.
  • To highlight the utility of novel selective agonists and antagonists in elucidating receptor function in airways.

Main Methods:

  • Utilized selective agonists and antagonists for tachykinin receptor subtypes (NK1, NK2, NK3).
  • Examined the role of these receptors in mediating bronchoconstriction in various mammalian species, including humans.

Main Results:

  • Development of highly selective analogs (approx. 1000-fold selectivity) for endogenous tachykinins.
  • Availability of selective nonpeptide and modified peptide antagonists for NK1, NK2, and NK3 receptors.
  • New knowledge generated on the specific roles of tachykinin receptor subtypes in airway smooth muscle contraction.

Conclusions:

  • Selective pharmacological tools have significantly advanced the understanding of tachykinin receptor subtypes.
  • These tools are crucial for dissecting the mechanisms of bronchoconstriction mediated by NK1, NK2, and NK3 receptors in diverse species.

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