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Somatostatin 4 receptor activation modulates G-protein coupled inward rectifying potassium channels and voltage stimulated calcium signals in dorsal root ganglion neurons.

Abstract
Somatostatin has a wide biological profile resulting from its actions on the five receptor subtypes (sst1-5). Recently somatostatin was shown to exert analgesic effects via activation of the sst4 receptor. Although the analgesia in pain models is established, the precise molecular mechanism has yet to be fully elucidated. This research aimed to identify possible anti-nociceptive mechanisms, showing functional links of the sst4 receptor to G-protein coupled inward rectifying potassium (GIRK) channels and reduction of voltage stimulated calcium influx within the pain processing pathway. Whole cell voltage clamp experiments and calcium imaging experiments were conducted on DRG neurons prepared from adult rats. Application of an sst4 receptor selective agonist, J-2156, on DRG neurons induced a GIRK modulated potassium current, and inhibited voltage sensitive calcium current. Both mechanisms are thought to contribute to the analgesic properties of sst4 receptor agonists.
AuthorsLouise Gorham, Stefan Just, Henri Doods
JournalEuropean journal of pharmacology (Eur J Pharmacol) Vol. 736 Pg. 101-6 (Aug 05 2014) ISSN: 1879-0712 [Electronic] Netherlands
PMID24769416 (Publication Type: Journal Article)
CopyrightCopyright © 2014 Elsevier B.V. All rights reserved.
Chemical References
  • Butanes
  • G Protein-Coupled Inwardly-Rectifying Potassium Channels
  • Naphthalenes
  • Receptors, Somatostatin
  • Sulfones
  • somatostatin receptor subtype-4
  • (1'S, 2S)-4-amino-N-(1'-carbamoyl-2'-phenylethyl)-2-(4''-methyl-1''-naphthalenesulfonylamino)butanamide
  • Calcium
Topics
  • Animals
  • Butanes (pharmacology)
  • Calcium (physiology)
  • G Protein-Coupled Inwardly-Rectifying Potassium Channels (physiology)
  • Ganglia, Spinal (cytology, physiology)
  • In Vitro Techniques
  • Male
  • Naphthalenes (pharmacology)
  • Neurons (drug effects, physiology)
  • Rats
  • Receptors, Somatostatin (agonists, physiology)
  • Sulfones (pharmacology)

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