Cited by 67Pain Mechanisms and TreatmentsNeuroscience and Neuropharmacology ResearchNeuropeptides and Animal Physiology

GABA-mediated oxytocinergic inhibition in dorsal horn neurons by hypothalamic paraventricular nucleus stimulation

Rojas-Piloni, Gerardo, López-Hidalgo, Mónica, Martínez-Lorenzana, Guadalupe, Rodríguez-Jiménez, Javier, Condés-Lara, Miguel·2007·Brain Research

Abstract

In anaesthetized rats, we tested whether the unit activity of dorsal horn neurons that receive nociceptive input is modulated by electrical stimulation of the hypothalamic paraventricular nucleus (PVN). An electrophysiological mapping of dorsal horn neurons at L3-L4 let us choose cells responding to a receptive field located in the toes region of the left hindpaw. Dorsal horn neurons were classified according to their response properties to peripheral stimulation. Wide Dynamic Range (WDR) cells responding to electrical stimulation of the peripheral receptive field and presenting synaptic input of Adelta, Abeta, and C-fibers were studied. Suspected interneurons that are typically silent and lack peripheral receptive field responses were also analyzed. PVN electrical stimulation inhibits Adelta (-55.0+/-10.2%), C-fiber (-73.1+/-6.7%), and post-discharge (-75.0+/-8.9%) peripheral activation in WDR cells, and silent interneurons were activated. So, this last type of interneuron was called a PVN-ON cell. In WDR cells, the inhibition of peripheral responses caused by PVN stimulation was blocked by intrathecal administration of a specific oxytocin antagonist or bicuculline. However, PVN-ON cell activation was blocked by the same specific oxytocin antagonist, but not by bicuculline. Our results suggest that PVN stimulation inhibits nociceptive peripheral-evoked responses in WDR neurons by a descending oxytocinergic pathway mediated by GABAergic PVN-ON cells. We discuss our observation that the PVN electrical stimulation selectively inhibits Adelta and C-fiber activity without affecting Abeta fibers. We conclude that Adelta and C-fibers receive a presynaptic inhibition mediated by GABA.

Integrity signals

Registry

Crossref · 10.1016/j.brainres.2006.12.045

Cites

34 of 34 references verified0 citation errors · 0 not checkable

Statistics

Recomputing p-values needs the paper’s full text.

Claims the paper makes

This paper’s full text isn’t openly available, so its claims and self-check weren’t run. The registry and citation checks still apply.

Claims other papers make about this one

Each is checked against this paper’s own text: does it say what the citing paper says it does?

  • 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.”

Cites

Flagged first, then by citations

2 of the 36 references couldn’t be matched to a known paper.

Cited by

Sorted by citations

Authors
Rojas-Piloni, G., López-Hidalgo, M., Martínez-Lorenzana, G., Rodríguez-Jiménez, J., & Condés-Lara, M.
Affiliations
Universidad Nacional Autónoma de México (MX)
Venue
Brain Research
Publisher
Elsevier BV
Published
2007-03
Volume
1137
Issue
1
Pages
69-77
ISSN
0006-8993 (ISSN-L)
OpenAlex
W2054150356
Cited by
67
References
36
Citations by year
2025: 1 · 2024: 4 · 2023: 1 · 2022: 1 · 2021: 5 · 2020: 5 · 2019: 4 · 2018: 4 · 2017: 7 · 2016: 2 · 2015: 1 · 2014: 6 · 2013: 2 · 2012: 5
FWCI
3.29
Type
journal article
Language
en
Open access
closed
Locations
  • Brain Research (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Health Sciences › Medicine › Physiology › Pain Mechanisms and Treatments
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuroscience and Neuropharmacology Research
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuropeptides and Animal Physiology
Keywords
oxytocin, paraventricular nucleus, dorsal horn neurons, GABAergic inhibition, nociception, descending pain modulation, wide dynamic range neurons, A-delta fibers, C-fibers, presynaptic inhibition, oxytocin antagonist, bicuculline, spinal cord
MeSH terms
Action Potentials, Animals, Bicuculline, Brain Mapping, Electric Stimulation, gamma-Aminobutyric Acid, Nerve Fibers, Neural Inhibition, Oxytocin, Paraventricular Hypothalamic Nucleus, Rats, Wistar, GABA Antagonists, Posterior Horn Cells, Rats

About these checks

Registry, retraction, Cites and statistics results are computed, not judged, with one exception: a printed reference that no index lists is read once by a model before it counts as a citation error. Claims are extracted by a model and kept only when their quote appears verbatim in the text; each cited source is then checked, with a model’s help, for whether it says what the claim relies on. Those verdicts can be wrong — read the claim’s quote and the cited source before relying on one.

Statistics and arithmetic are recomputed, not judged.

Confidence bands are shown only for fields calibrated on our annotated test set. None is calibrated yet, so no band is shown.

What counts as a claim ›How we measure confidence ›How we check this ›

Are you an author, or do you see a problem with this page? Request a review