Tachykinin antagonists inhibit nerve-mediated contractions in the circular muscle of the human ileum. Involvement of neurokinin-2 receptors.

Abstract:

:The effects of some newly developed tachykinin antagonists that are selective for the neurokinin (NK)-1 (L 668,169) or the NK-2 (MEN 10,207, L 659,877 and R 396) tachykinin receptor on the cholinergic and noncholinergic contraction and on the nonadrenergic noncholinergic relaxation produced by electrical field stimulation (50 Hz) were investigated in mucosa-free circular strips of the human ileum. The strips were contracted by substance P and neurokinin A as well as by selective NK-2-receptor ligands, [beta Ala8]neurokinin A(4-10), and MDL 28,564, the latter peptide being capable of discriminating between NK-2-receptor subtypes. The selectivity of the antagonists for NK-1 or NK-2 receptors was confirmed in pharmacological experiments using substance P, neurokinin A, and [beta Ala8]neurokinin A(4-10) as stimulants. Among the NK-2-selective antagonists, MEN 10,207 displayed the highest affinity, followed by L 659,877 and R 396. The antagonists MEN 10,207 and L 659,877 inhibited the noncholinergic contraction to electrical stimulation in a concentration-dependent manner; L 668,169 and R 396 were poorly effective. Thus the potency of antagonists toward the noncholinergic response closely paralleled their rank order of potency at NK-2 receptors. The cholinergic contraction and nonadrenergic noncholinergic relaxation were not inhibited by the antagonists. Both substance P- and neurokinin A-like immunoreactivities were detected in extracts of the human ileum, and the identity of the corresponding peptides was confirmed by reverse-phase high-performance liquid chromatography. It was concluded that in addition to NK-1 receptors, the circular muscle of the human ileum also contains NK-2 receptors. Activation of the latter is chiefly responsible for the noncholinergic contraction to nerve stimulation.

journal_name

Gastroenterology

journal_title

Gastroenterology

authors

Maggi CA,Giuliani S,Patacchini R,Santicioli P,Theodorsson E,Barbanti G,Turini D,Giachetti A

doi

10.1016/0016-5085(92)91787-5

keywords:

subject

Has Abstract

pub_date

1992-01-01 00:00:00

pages

88-96

issue

1

eissn

0016-5085

issn

1528-0012

pii

0016-5085(92)91787-5

journal_volume

102

pub_type

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