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Kappa Opioid Receptor Distribution and Function in Primary Afferents.

Lindsey M Snyder1, Michael C Chiang1, Emanuel Loeza-Alcocer1

  • 1Department of Neurobiology and the Pittsburgh Center for Pain Research, University of Pittsburgh, Pittsburgh, PA 15213, USA.

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Summary

Kappa opioid receptor (KOR) is expressed in sensory neurons, inhibiting pain signaling. Peripherally acting KOR agonists effectively reduce pain and itch, offering a new therapeutic approach.

Keywords:
DRGOprk1dorsal root gangliadynorphinhumanitchmousenalfurafinepainprimary afferents

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Area of Science:

  • Neuroscience
  • Pain Research
  • Pharmacology

Background:

  • Kappa opioid receptor (KOR) signaling is known to inhibit primary afferents.
  • The specific somatosensory neuron populations expressing KOR have not been fully elucidated.

Purpose of the Study:

  • To identify the specific somatosensory neuron types expressing KOR.
  • To investigate the functional roles of KOR in both central and peripheral pain pathways.
  • To evaluate the therapeutic potential of peripherally restricted KOR agonists.

Main Methods:

  • Utilized a novel KOR-cre knockin mouse model.
  • Employed viral tracing, single-cell RT-PCR, and ex vivo electrophysiological recordings.
  • Assessed behavioral responses to pain and itch in preclinical models.

Main Results:

  • KOR expression was confirmed in peptidergic sensory neurons and low-threshold mechanoreceptors.
  • Central KOR signaling inhibits neurotransmission from KOR-expressing afferents.
  • Peripheral KOR activation suppresses neurogenic inflammation and nociceptor sensitization.
  • Peripherally restricted KOR agonists reduced pain, itch, and hypersensitivity in a surgical incision model.

Conclusions:

  • KOR is expressed in key somatosensory neuron populations involved in pain transmission.
  • KOR signaling modulates pain perception both centrally and peripherally.
  • Peripherally restricted KOR agonists represent a promising therapeutic strategy for managing pain and itch.