Tachykinin receptors in the circular muscle of the guinea-pig ileum.

Abstract:

:1. We have studied the mechanical response of circular strips of the guinea-pig ileum to tachykinins and characterized the receptors involved by means of receptor-selective agonists. 2. The strips responded to both substance P (SP) and neurokinin A (NKA), as well as to [Pro9]-SP sulphone (selective NK1-receptor agonist), [beta Ala8]-NKA(4-10) (selective NK2-receptor agonist) and [MePhe7]-neurokinin B (selective NK3-receptor agonist). The ED50s of the various peptides (calculated as the concentration of agonist which produced 50% of the response to 10 microM carbachol) were similar, in the range of 40-200 nM, i.e. no clearcut rank order of potency was evident. 3. The response to a submaximal (10 nM) concentration of SP or NKA was unaffected in the presence of peptidase inhibitors (thiorphan, captopril and bestatin, 1 microM each). 4. The response to the NK1-agonist was totally atropine-resistant, but was reduced (about 30% inhibition) by tetrodotoxin. The response to the NK3-receptor agonist was halved by atropine and abolished by tetrodotoxin. The response to the NK2-agonist was unaffected by either atropine or tetrodotoxin. 5. The response to the selective NK2-agonist was unchanged after desensitization of NK1- or NK3-receptors. 6. The response to the NK2-selective agonist was strongly inhibited by [Tyr5, D-Trp6,8,9, Arg10]-NKA(4-10) (MEN 10,207) a selective NK2-receptor antagonist which did not modify the response to the NK1-selective agonist. 7. Our findings indicate that all the three known types of tachykinin receptors mediate the contractile response of the circular muscle of the guinea-pig ileum to peptides of this family. The response to activation of NK3-receptors is totally neurogenic and partially mediated by endogenous acetylcholine, the response to activation of NK1-receptors is partly neurogenic and largely myogenic and the response to activation of NK2-receptors is totally myogenic.

journal_name

Br J Pharmacol

authors

Maggi CA,Patacchini R,Giachetti A,Meli A

doi

10.1111/j.1476-5381.1990.tb14195.x

subject

Has Abstract

pub_date

1990-12-01 00:00:00

pages

996-1000

issue

4

eissn

0007-1188

issn

1476-5381

journal_volume

101

pub_type

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