Linked Life Data

8467862

Source:http://linkedlifedata.com/resource/pubmed/id/8467862

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
2-3
pubmed:dateCreated
1993-5-10
pubmed:abstractText
Neuropeptide Y (NPY-(1-36)) acts on Y1 and Y2 receptors at the sympathetic neuroeffector junction. Various truncated NPY analogs were tested in the isolated guinea-pig caval vein where NPY is a vasoconstrictor (Y1 receptors) and in isolated rat vas deferens, by monitoring the suppression of electrically evoked contractions (Y2 receptors). The aim of this study was to define which parts of the NPY-(1-36) molecule were required to activate these receptors. NPY-(1-36), [Pro34]NPY and [Glu16,Ser18,Ala22,Leu28,31]NPY (ESALL-NPY), the latter being an analog with increased alpha-helicity in the 14-31 region, evoked vasoconstriction with similar potency and efficacy. Cyclic as well as linear NPY analogs having the 4 to 7 N-terminal amino acid residues linked to the 9 to 19 C-terminal residues by an 8-aminooctanoic acid (Aoc) residue were 25-50 times less potent than NPY-(1-36) itself. In the cyclic analogs, a disulfide bond was introduced to bring the N- and C-termini close together. Linear Aoc-2-27-NPY was virtually inactive. The Y1 receptor needs an intact N-terminal end of NPY in order to become fully activated. The requirements for the C-terminus are less stringent, since substitutions in this part of the molecule resulted in fully active analogs. The central portion of the molecule may impose steric constraints on the N- and C-terminal ends, thereby facilitating Y1 receptor activation, but it does not seem to be essential for receptor recognition. NPY-(2-36) and NPY-(5-36) were only slightly less potent than the parent molecule in suppressing electrically evoked twitches in the vas deferens.(ABSTRACT TRUNCATED AT 250 WORDS)
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Mar
pubmed:issn
0014-2999
pubmed:author
pubmed:issnType
Print
pubmed:day
2
pubmed:volume
232
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
271-8
pubmed:dateRevised
2006-11-15
pubmed:meshHeading
pubmed:year
1993
pubmed:articleTitle
Activation of neuropeptide Y1 and neuropeptide Y2 receptors by substituted and truncated neuropeptide Y analogs: identification of signal epitopes.
pubmed:affiliation
Department of Pharmacology, University of Lund, Sweden.
pubmed:publicationType
Journal Article, In Vitro, Research Support, Non-U.S. Gov't