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NOP-Related Mechanisms in Pain and Analgesia

  • Lawrence TollEmail author
  • Akihiko Ozawa
  • Andrea Cippitelli
Chapter
Part of the Handbook of Experimental Pharmacology book series (HEP, volume 254)

Abstract

Since the discovery of the NOP receptor and N/OFQ as the endogenous ligand, evidence has appeared demonstrating the involvement of this receptor system in pain. This was not surprising for members of the opioid receptor and peptide families, particularly since both the receptor and N/OFQ are highly expressed in brain regions involved in pain, spinal cord, and dorsal root ganglia. What has been surprising is the complicated picture that has emerged from 25 years of research. The original finding that N/OFQ decreased tail flick and hotplate latency, when administered i.c.v., led to the hypothesis that NOP receptor antagonists could have analgesic activity without abuse liability. However, as data accumulated, it became clear that not only the potency but the activity per se was different when N/OFQ or small molecule NOP agonists were administered in the brain versus the spinal cord and it also depended upon the pain assay used. When administered systemically, NOP receptor agonists are generally ineffective in attenuating heat pain but are antinociceptive in an acute inflammatory pain model. Most antagonists administered systemically have no antinociceptive activity of their own, even though selective peptide NOP antagonists have potent antinociceptive activity when administered i.c.v. Chronic pain models provide different results as well, as small molecule NOP receptor agonists have potent anti-allodynic and anti-hyperalgesic activity after systemic administration. A considerable number of electrophysiological and anatomical experiments, in particular with NOP-eGFP mice, have been conducted in an attempt to explain the complicated profile resulting from NOP receptor modulation, to examine receptor plasticity, and to elucidate mechanisms by which selective NOP agonists, bifunctional NOP/mu agonists, or NOP receptor antagonists modulate acute and chronic pain.

Keywords

Chronic pain Dorsal root ganglia Immunohistochemistry N/OFQ Nociceptin NOP-eGFP NOP receptor 

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Copyright information

© Springer Nature Switzerland AG 2019

Authors and Affiliations

  • Lawrence Toll
    • 1
    Email author
  • Akihiko Ozawa
    • 1
  • Andrea Cippitelli
    • 1
  1. 1.Department of Biomedical SciencesCharles E. Schmidt College of Medicine, Florida Atlantic UniversityBoca RatonUSA

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