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Related Experiment Videos

Towards a receptor for nocistatin?

E E Johnson1, M Connor

  • 1Pain Management Research Institute, Kolling Institute, University of Sydney, E25 Royal North Shore Hospital, St Leonards, New South Wales, Australia.

British Journal of Pharmacology
|July 10, 2007
PubMed
Summary
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Nocistatin, a peptide, inhibits serotonin release in the brain via a novel mechanism. This study reveals its distinct actions, independent of nociceptin receptors, suggesting a new G protein-coupled receptor.

Area of Science:

  • Neuroscience
  • Pharmacology
  • Molecular Biology

Background:

  • Nocistatin is a peptide derived from pronociceptin.
  • Its cellular actions in the brain and receptor identity remain largely unknown.
  • Nociceptin (NOP or ORL1) receptors are known targets for related peptides.

Purpose of the Study:

  • To investigate the cellular actions of nocistatin in the brain.
  • To identify the receptor mediating nocistatin's effects.
  • To elucidate the signaling pathway involved in nocistatin's central nervous system activity.

Main Methods:

  • Experiments using rat cortical synaptosomes.
  • Measurement of 5-HT release.
  • Pertussis toxin sensitivity assays.

Related Experiment Videos

  • Assessment of nocistatin activity independent of NOP receptors.

    • Main Results:

    • Nocistatin demonstrated a concentration-dependent inhibition of 5-HT release from cortical synaptosomes.
    • The inhibitory effect was sensitive to Pertussis toxin, indicating G protein involvement.
    • Nocistatin's actions were independent of NOP receptors.

    Conclusions:

    • This study provides the first clear evidence of nocistatin agonist activity in the brain.
    • Nocistatin likely acts via an as-yet-unidentified G protein-coupled receptor.
    • Findings suggest a novel signaling pathway for nocistatin in the central nervous system, distinct from NOP receptors.