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Updated: Aug 20, 2025
07:09
The Sciatic Nerve Cuffing Model of Neuropathic Pain in Mice
Published on: July 16, 2014
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Neuropathic pain as a trigger for histone modifications in limbic circuitry
Svetlana Bryant1, Julie-Anne Balouek2, Luke T Geiger2
1Department of Psychology, Rutgers, The State University of New Jersey, Piscataway, New Jersey, USA.
Genes, Brain, and Behavior
|November 22, 2022
Summary
Chronic nerve injury in mice alters epigenetic markers in brain regions involved in pain and emotion. These changes suggest lasting transcriptional suppression in the brain, potentially explaining chronic pain sensitivity.
Area of Science:
- Neuroscience
- Epigenetics
- Chronic Pain Research
Background:
- Chronic pain involves neuronal plasticity in the central and peripheral nervous systems.
- Mesolimbic forebrain regions show lasting gene expression changes in chronic pain models.
- Understanding epigenetic regulation in pain-associated brain areas is crucial.
Purpose of the Study:
- To investigate epigenetic modifications in brain regions processing pain and affect following sciatic nerve injury.
- To examine changes in histone modifications associated with active or permissive transcriptional states.
Main Methods:
- Examined histone H3 lysine 4 trimethylation and H3 lysine 27 acetylation in the periaqueductal gray (PAG), lateral hypothalamus (LH), nucleus accumbens (NAc), and ventral tegmental area (VTA).
- Utilized a mouse model of chronic pain induced by sciatic nerve injury.
- Analyzed epigenetic markers 5 weeks post-injury in male and female mice.
Main Results:
- A trend for reduced epigenetic markers was observed in the PAG, LH, and NAc, but not the VTA, in chronic pain mice.
- Specific epigenetic modifications correlated with pain history.
- Other modifications were linked to individual differences in pain sensitivity.
Conclusions:
- Sciatic nerve injury induces chronic chromatin-mediated transcriptional suppression in key limbic brain structures.
- These epigenetic changes may underlie enduring alterations in pain processing and sensitivity.
- Findings highlight the role of epigenetics in the long-term neurobiological adaptations to chronic pain.
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