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Activation of neuropeptide Y1 and neuropeptide Y2 receptors by substituted and truncated neuropeptide Y analogs : identification of signal epitopes

Grundemar, L LU ; Krstenansky, J L and Håkanson, R LU (1993) In European Journal of Pharmacology 232(2-3). p.271-278
Abstract

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... (More)

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)

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keywords
Amino Acid Sequence, Animals, Electric Stimulation, Guinea Pigs, In Vitro Techniques, Male, Molecular Sequence Data, Muscle, Smooth/drug effects, Muscle, Smooth, Vascular/drug effects, Neuropeptide Y/analogs & derivatives, Rats, Rats, Sprague-Dawley, Receptors, Neuropeptide Y/drug effects, Swine, Vas Deferens/drug effects, Vasoconstriction/drug effects
in
European Journal of Pharmacology
volume
232
issue
2-3
pages
271 - 278
publisher
Elsevier
external identifiers
  • pmid:8467862
ISSN
0014-2999
DOI
10.1016/0014-2999(93)90784-f
language
English
LU publication?
yes
id
ad00ab00-c905-4d72-b15a-61a7365f4f06
date added to LUP
2019-09-03 14:08:26
date last changed
2019-12-04 04:02:31
@article{ad00ab00-c905-4d72-b15a-61a7365f4f06,
  abstract     = {<p>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)</p>},
  author       = {Grundemar, L and Krstenansky, J L and Håkanson, R},
  issn         = {0014-2999},
  language     = {eng},
  month        = {03},
  number       = {2-3},
  pages        = {271--278},
  publisher    = {Elsevier},
  series       = {European Journal of Pharmacology},
  title        = {Activation of neuropeptide Y1 and neuropeptide Y2 receptors by substituted and truncated neuropeptide Y analogs : identification of signal epitopes},
  url          = {http://dx.doi.org/10.1016/0014-2999(93)90784-f},
  doi          = {10.1016/0014-2999(93)90784-f},
  volume       = {232},
  year         = {1993},
}