Inhibition of neurogenic plasma exudation in guinea-pig airways by CP-96,345, a new non-peptide NK1 receptor antagonist.
A new non-peptide tachykinin antagonist, CP-96,345, inhibited airway plasma exudation induced in guinea-pigs by i.v. substance P in a dose-dependent manner with dose-ratios in the main bronchi of 5 at 1 nmol kg-1 and 19 at 100 nmol kg-1. At 100 nmol kg-1, CP-96,345 completely inhibited plasma exudation induced by either electrical stimulation of the cervical vagus nerves or i.v. capsaicin, indicating inhibition of the effects of endogenous tachykinins, but did not inhibit the bronchoconstrictor response to neurokinin A, suggesting selectivity for NK1 receptors. CP-96,345 may be useful in examining the role of endogenous tachykinins in vivo.
Department of Thoracic Medicine, National Heart & Lung Institute, London.
Y H
YH
Lei
P J
PJ
Barnes
D F
DF
Rogers
D000818:Animals; D001713:Biphenyl Compounds / Q000494:pharmacology*; D002211:Capsaicin / Q000494:pharmacology; D004558:Electric Stimulation; D005070:Evans Blue; D005122:Exudates and Transudates / Q000187:drug effects / Q000378:metabolism*; D006168:Guinea Pigs; D008297:Male; D018040:Receptors, Neurokinin-1; D017981:Receptors, Neurotransmitter / Q000037:antagonists & inhibitors*; D013373:Substance P / Q000494:pharmacology; D014630:Vagus Nerve / Q000502:physiology
D001713:Biphenyl Compounds; D018040:Receptors, Neurokinin-1; D017981:Receptors, Neurotransmitter; D013373:Substance P; D005070:Evans Blue; D002211:Capsaicin; C066892:CP 96345