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Distinct functions of opioid-related peptides and gastrin-releasing peptide in regulating itch and pain in the spinal cord of primates

Title
Distinct functions of opioid-related peptides and gastrin-releasing peptide in regulating itch and pain in the spinal cord of primates
Authors
Lee H.Ko M.-C.
Ewha Authors
이희승
SCOPUS Author ID
이희승scopus
Issue Date
2015
Journal Title
Scientific Reports
ISSN
2045-2322JCR Link
Citation
vol. 5
Publisher
Nature Publishing Group
Indexed
SCI; SCIE; SCOPUS WOS scopus
Abstract
How neuropeptides in the primate spinal cord regulate itch and pain is largely unknown. Here we elucidate the sensory functions of spinal opioid-related peptides and gastrin-releasing peptide (GRP) in awake, behaving monkeys. Following intrathecal administration, β-endorphin (10-100a €‰nmol) and GRP (1-10a €‰nmol) dose-dependently elicit the same degree of robust itch scratching, which can be inhibited by mu-opioid peptide (MOP) receptor and GRP receptor (BB 2) antagonists, respectively. Unlike β-endorphin, which produces itch and attenuates inflammatory pain, GRP only elicits itch without affecting pain. In contrast, enkephalins (100-1000a €‰nmol) and nociceptin-orphanin FQ (3-30a €‰nmol) only inhibit pain without eliciting itch. More intriguingly, dynorphin A(1-17) (10-100a €‰nmol) dose-dependently attenuates both β-endorphin and GRP-elicited robust scratching without affecting pain processing. The anti-itch effects of dynorphin A can be reversed by a kappa-opioid peptide (KOP) receptor antagonist nor-binaltorphimine. These nonhuman primate behavioral models with spinal delivery of ligands advance our understanding of distinct functions of neuropeptides for modulating itch and pain. In particular, we demonstrate causal links for itch-eliciting effects by β-endorphin-MOP receptor and GRP-BB 2 receptor systems and itch-inhibiting effects by the dynorphin A-KOP receptor system. These studies will facilitate transforming discoveries of novel ligand-receptor systems into future therapies as antipruritics and/or analgesics in humans.
DOI
10.1038/srep11676
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의학전문대학원 > 의학과 > Journal papers
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