Abstract:
:The effect of T-2328 {2-fluoro-4'-methoxy-3'-[[[(2S,3S)-2-phenyl-3-piperidinyl]amino]methyl]-[1,1'-biphenyl]-4-carbonitrile dihydrochloride}, a novel tachykinin NK(1)-receptor antagonist, was examined on cisplatin-induced emesis in ferrets. Cisplatin induced acute emesis in 24 h and delayed emesis during 24 and 72 h, respectively. Ondansetron, a 5-HT(3) antagonist, almost completely blocked the acute emesis and transiently reduced the delayed emesis. In contrast, T-2328 elicited long-lasting anti-emetic effects on both acute and delayed phases by a single intravenous administration. Suppression of delayed emesis was not due to elimination of the acute phase because the delayed emesis was also suppressed by administration after the onset of delayed emesis. Persistent blockade of NK(1) receptors in the brain was demonstrated by inhibition of the NK(1) agonist-induced foot tapping response for over 24 h. An appreciable amount of T-2328 was present in the brain 32 and 72 h after the injection. The NK(1) agonist-induced contractions of isolated ileum in guinea pigs was antagonized with IC(50) values of 1.4 nM in an insurmountable manner. It is likely that T-2328 exerts the long-lasting anti-emetic effect by not only long-term presence in the brain but also its insurmountable inhibition of NK(1) receptors.
journal_name
J Pharmacol Scijournal_title
Journal of pharmacological sciencesauthors
Watanabe Y,Okamoto M,Ishii T,Takatsuka S,Taniguchi H,Nagasaki M,Saito Adoi
10.1254/jphs.08027fpsubject
Has Abstractpub_date
2008-06-01 00:00:00pages
151-8issue
2eissn
1347-8613issn
1347-8648pii
JST.JSTAGE/jphs/08027FPjournal_volume
107pub_type
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