Publication Date:
1984-11-23
Description:
The tachykinins are a family of peptides with the carboxyl terminal amino acid sequence Phe-X-Gly-Leu-Met-NH2. Three major mammalian tachykinins have been identified--substance K, neuromedin K, and substance P--but only two tachykinin receptors have been postulated. Three tachykinins were labeled with radioiodinated Bolton-Hunter reagent and their binding characteristics were determined in crude membrane suspensions from several tissues. In cerebral cortex labeled eledoisin exhibited high-affinity binding that was inhibited by tachykinins in a manner indicating a definitive SP-E receptor site. In gastrointestinal smooth muscle and bladder, high-affinity binding of labeled substance P was inhibited in a pattern indicating a definitive SP-P site. In intestinal smooth muscle and bladder, however, labeled substance K and labeled eledoisin were both bound in a pattern indicating a preference for substance K itself. The results suggest the existence of three distinct types of tachykinin receptors: SP-P, SP-E, and SP-K.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Buck, S H -- Burcher, E -- Shults, C W -- Lovenberg, W -- O'Donohue, T L -- New York, N.Y. -- Science. 1984 Nov 23;226(4677):987-9.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/6095447" target="_blank"〉PubMed〈/a〉
Keywords:
Animals
;
Binding, Competitive
;
Cell Membrane/metabolism
;
Cerebral Cortex/*metabolism
;
Duodenum/*metabolism
;
Guinea Pigs
;
Intestine, Small/*metabolism
;
Kinetics
;
Mice
;
Organ Specificity
;
Peptides/*metabolism
;
Rats
;
Receptors, Neurokinin-2
;
Receptors, Neurotransmitter/*metabolism
;
*Receptors, Tachykinin
;
Species Specificity
;
Tachykinins
;
Urinary Bladder/*metabolism
Print ISSN:
0036-8075
Electronic ISSN:
1095-9203
Topics:
Biology
,
Chemistry and Pharmacology
,
Computer Science
,
Medicine
,
Natural Sciences in General
,
Physics
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