Tachykinin receptors in the guinea-pig isolated bronchi.

Abstract:

:The aim of the study was to assess which tachykinin receptors mediate the contractile response in the guinea-pig isolated bronchi. Experiments with natural tachykinins and receptor-selective tachykinin agonists were performed in the absence or presence of peptidase inhibitors and in bronchi pretreated with phenoxybenzamine. Both NK-1 (substance P, substance P methylester and septide) and NK-2 (neurokinin A, [beta-Ala8]neurokinin A-(4-10) and MDL 28,564) receptor agonists produced concentration-dependent contraction. NK-3 agonists (senktide and [MePhe7]neurokinin B) were active only at high concentrations. Phenoxybenzamine pretreatment reduced the maximal response to NK-1 agonists and produced a rightward shift of the curve to NK-2 agonists, without depression of the maximum. Five tachykinin antagonists selective for the NK-1 (L 668,169) or the NK-2 (MEN 10,207, MEN 10,376, L 659,877 and R 396) receptor were tested against substance P methylester and [beta-Ala8]neurokinin A-(4-10). The results indicated that these receptor-selective antagonists maintain their characteristic even when tested in a multireceptor assay such as the guinea-pig bronchus. The rank order of potency of NK-2 antagonists against [beta-Ala8]neurokinin A-(4-10) was MEN 10,207 = MEN 10,376 greater than L 659,877 much greater than R 396. This pattern, with the observation of the full agonist activity of MDL 28,564, indicates that in addition to NK-1 receptors, NK-2 receptors also are present in the guinea-pig bronchi and belong to the same subtype (NK-2A) as present in the rabbit pulmonary artery.

journal_name

Eur J Pharmacol

authors

Maggi CA,Patacchini R,Quartara L,Rovero P,Santicioli P

doi

10.1016/0014-2999(91)90517-t

subject

Has Abstract

pub_date

1991-05-17 00:00:00

pages

167-74

issue

2-3

eissn

0014-2999

issn

1879-0712

pii

0014-2999(91)90517-T

journal_volume

197

pub_type

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