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Related Experiment Video

Updated: Jun 15, 2026

Partial Sciatic Nerve Ligation: A Mouse Model of Chronic Neuropathic Pain to Study the Antinociceptive Effect of Novel Therapies
08:16

Partial Sciatic Nerve Ligation: A Mouse Model of Chronic Neuropathic Pain to Study the Antinociceptive Effect of Novel Therapies

Published on: October 6, 2022

Decrease in the descending inhibitory 5-HT system in rats with spinal nerve ligation.

Feng-Yu Liu1, Xiao-Xiu Qu, Xu Ding

  • 1Neuroscience Research Institute and Department of Neurobiology, Peking University, 38 Xue-Yuan Road, Beijing 100191, PR China.

Brain Research
|March 17, 2010
PubMed
Summary
This summary is machine-generated.

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Spinal nerve injury reduces the inhibitory effects of the serotonin (5-HT) system, contributing to central sensitization and neuropathic pain. This decrease in descending 5-HT pathways is a key factor in nerve injury pain development.

Area of Science:

  • Neuroscience
  • Pain Research
  • Neurochemistry

Background:

  • The descending serotonergic (5-HT) system plays a crucial role in pain modulation.
  • Plasticity of the 5-HT system is observed in pathological conditions like inflammation and nerve injury.
  • Impairment of descending inhibitory 5-HT pathways is implicated in central sensitization and neuropathic pain.

Purpose of the Study:

  • To investigate the functional changes in the descending inhibitory 5-HT system after spinal nerve ligation (SNL).
  • To assess the involvement of specific 5-HT receptor subtypes in SNL-induced pain.
  • To determine alterations in 5-HT levels and turnover in the spinal cord following nerve injury.

Main Methods:

  • Electrophysiological recordings of dorsal horn wide dynamic range (WDR) neurons in response to C-fiber stimulation.

Related Experiment Videos

Last Updated: Jun 15, 2026

Partial Sciatic Nerve Ligation: A Mouse Model of Chronic Neuropathic Pain to Study the Antinociceptive Effect of Novel Therapies
08:16

Partial Sciatic Nerve Ligation: A Mouse Model of Chronic Neuropathic Pain to Study the Antinociceptive Effect of Novel Therapies

Published on: October 6, 2022

  • Administration of 5-HT receptor agonists and antagonists to evaluate their effects on neuronal activity.
  • Biochemical analysis of 5-HT and 5-hydroxyindoleacetic acid (5-HIAA) content and 5-HT turnover rate in the spinal cord.

    • Main Results:

    • SNL significantly attenuated the inhibitory effects of 5-HT and its receptor agonists (1A, 1B, 3, 4, 2C) on C-fiber responses in WDR neurons.
    • The effectiveness of 5-HT receptor antagonists (1B, 2C, 3, 4) in blocking 5-HT-induced inhibition was reduced post-SNL.
    • A decrease in 5-HT and 5-HIAA levels, alongside an increased 5-HT turnover rate, was observed in the ipsilateral dorsal spinal cord after SNL.

    Conclusions:

    • Spinal nerve injury leads to a reduction or loss of the descending inhibitory 5-HT system's function.
    • This diminished inhibitory capacity contributes to central sensitization.
    • The impairment of the descending inhibitory 5-HT system is proposed to be a critical mechanism in the development of neuropathic pain following nerve injury.