Document Detail

Cardiovascular effects of amphibian and mammalian tachykinins in the toad, Bufo marinus.
MedLine Citation:
PMID:  7682677     Owner:  NLM     Status:  MEDLINE    
In this study, we investigated the cardiovascular effects of four tachykinins in the anaesthetized toad, Bufo marinus. The potencies were compared of the amphibian peptides ranakinin and physalaemin and the mammalian peptide substance P, all of which interact preferentially with tachykinin NK-1 receptors. Neurokinin B, which is found in both mammals and amphibians, was also tested. All tachykinins produced dose-dependent decreases in arterial blood pressure. Ranakinin caused significantly greater falls in blood pressure than substance P, and the response was of longer duration. Both ranakinin and physalaemin were significantly more potent at decreasing blood pressure than neurokinin B. The NK-3 receptor selective agonist, senktide, caused no change in blood pressure. No tachykinin, at doses up to 10 nmole/kg, produced effects on baseline heart rate or affected the ability of the vagus nerves to slow the heart. A non-peptide NK-1 receptor antagonist, CP96,345 (in the dose range 10(-10)-5 x 10(-7) moles/kg) had no effect on the depressor action of ranakinin or substance P. It is concluded that amphibian tachykinins cause depressor effects via an NK-1-like receptor which differs substantially from its mammalian counterpart.
G P Courtice; E Burcher; R Carlo-Stella; J M Conlon
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Neuropeptides     Volume:  24     ISSN:  0143-4179     ISO Abbreviation:  Neuropeptides     Publication Date:  1993 Mar 
Date Detail:
Created Date:  1993-05-17     Completed Date:  1993-05-17     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  8103156     Medline TA:  Neuropeptides     Country:  SCOTLAND    
Other Details:
Languages:  eng     Pagination:  171-6     Citation Subset:  IM    
School of Physiology and Pharmacology, University of New South Wales, Kensington, Sydney, Australia.
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MeSH Terms
Amino Acid Sequence
Amphibians / metabolism*
Blood Pressure / drug effects
Bufo marinus
Cardiovascular System / drug effects*
Heart Rate / drug effects*
Mammals / metabolism*
Molecular Sequence Data
Substance P / antagonists & inhibitors
Tachykinins / pharmacology*
Vagus Nerve / drug effects
Reg. No./Substance:
0/Tachykinins; 33507-63-0/Substance P

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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