Cited by 74Pain Mechanisms and TreatmentsIon Channels and ReceptorsIon channel regulation and function

Oxytocin-induced membrane hyperpolarization in pain-sensitive dorsal root ganglia neurons mediated by Ca2+/nNOS/NO/KATP pathway

Gong, L., Gao, F., Li, J., Li, J., Yu, X., Ma, X., Zheng, W., Cui, S. +4 more·2015·Neuroscience

Abstract

Oxytocin (OT) plays an important role in pain modulation and antinociception in the central nervous system. However, little is known about its peripheral effects. This study was conducted to investigate the effect of OT on the electrical properties of neurons in the dorsal root ganglia (DRG) and the underlying mechanisms. DRG neurons from adult rats were acutely dissociated and cultured. Intracellular Ca(2+) was determined by fluorescent microscopy using an indicator dye. The electrical properties of DRG neurons were tested by patch-clamp recording. The oxytocin receptor (OTR) and neuronal nitric oxide synthase (nNOS) on DRG neurons were assessed with immunofluorescence assays. OTR co-localized with nNOS in most of Isolectin B4 (IB4)-binding cultured DRG neurons in rats. OT decreased the excitability, increased the outward current, and evoked the membrane hyperpolarization in cultured DRG neurons. Sodium nitroprusside (SNP), the donor of nitric oxide (NO), exerted similar effects as OT on the membrane potential of cultured DRG neurons. OT increased the production of NO in DRGs and cultured DRG neurons. Pre-treatment of the OTR antagonist atosiban or the selective nNOS inhibitor N-Propyl-l-arginine (NPLA) significantly attenuated the hyperpolarization effect evoked by OT. OT produced a concentration-dependent increase in intracellular Ca(2+) in DRG neurons that responds to capsaicin, which can be attenuated by atosiban, but not by NPLA. OT-evoked membrane hyperpolarization and increase of outward current were distinctly attenuated by glibenclamide, a blocker of ATP-sensitive K(+) (KATP) channel. OT might be an endogenous antinociceptive agent and the peripheral antinociceptive effects of OT are mediated by activation of the Ca(2+)/nNOS/NO/KATP pathway in DRG neurons.

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Crossref · 10.1016/j.neuroscience.2014.12.058

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  • One mechanism of oxytocin antinociception involves engagement of GABA-mediated inhibitory circuits at superficial layers of spinal cord dorsal horn neurones, which express oxytocin receptors and receive direct projections from hypothalamic oxytocin neurones, reducing Aδ/C-fibre afferent signalling and ascending nociceptive input.

    “One mechanism involves the engagement of GABA‐mediated inhibitory circuits at the superficial layers of spinal cord dorsal horn neurones, which express oxytocin receptors 7 and receive direct projections from hypothalamic oxytocin neurones 8, 9, reducing Aδ/C‐fibre afferent signalling and ascending nociceptive input 10, 11, 12, 13, 14.”
  • Animal studies have shown that oxytocin can specifically reduce Aδ/C-fibre afferent signalling and ascending nociceptive input at the level of spinal cord dorsal horn neurones by engaging GABA-mediated inhibitory cellular mechanisms.

    “animal studies have shown that oxytocin can specifically reduce Aδ/C‐fibre afferent signalling and ascending nociceptive input at the level of spinal cord dorsal horn neurones by engaging GABA‐mediated inhibitory cellular mechanisms 10, 11, 12, 13, 14, 29.”

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Authors
Gong, L., Gao, F., Li, J., Li, J., Yu, X., Ma, X., Zheng, W., Cui, S., Liu, K., Zhang, M., Kunze, W., & Liu, C. Y.
Affiliations
  • Shandong University (CN)
  • McMaster University (CA)
  • St. Joseph’s Healthcare Hamilton (CA)
Corresponding author
Liu, C.Y.
Venue
Neuroscience
Publisher
Elsevier BV
Published
2015-03
Volume
289
Pages
417-428
ISSN
0306-4522 (ISSN-L)
OpenAlex
W2091582983
Cited by
74
References
75
Citations by year
2026: 1 · 2025: 3 · 2024: 7 · 2023: 9 · 2022: 6 · 2021: 8 · 2020: 7 · 2019: 11 · 2018: 7 · 2017: 8 · 2016: 6 · 2015: 1
FWCI
5.40
Type
journal article
Language
en
Open access
closed
Locations
  • Neuroscience (publishedVersion)
  • PubMed (publishedVersion)
Funders
National Natural Science Foundation of China
Topics
  • Health Sciences › Medicine › Physiology › Pain Mechanisms and Treatments
  • Life Sciences › Neuroscience › Sensory Systems › Ion Channels and Receptors
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Ion channel regulation and function
Keywords
oxytocin, dorsal root ganglion neurons, membrane hyperpolarization, oxytocin receptor, neuronal nitric oxide synthase, nitric oxide, ATP-sensitive potassium channels, calcium signaling, antinociception, neuronal excitability, outward current, capsaicin
MeSH terms
Analgesics, Animals, Calcium, Cells, Cultured, Ganglia, Spinal, Male, Membrane Potentials, Neurons, Nitric Oxide, Oxytocin, Rats, Wistar, Receptors, Oxytocin, Patch-Clamp Techniques, Nitric Oxide Synthase Type I, KATP Channels

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