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Updated: Oct 2, 2025
Author Spotlight: Insight Into Innovations in Spinal Cord Injury Research
Published on: January 19, 2024
Effects of the Notch Signaling Pathway on Secondary Brain Changes Caused by Spinal Cord Injury in Mice
Chengcai Li1, Shaoxin Huang2, Wu Zhou1
1Department of Neurosurgery, The First Affiliated Hospital of Nanchang University, NO17 Yong Wai Zheng Street, Nanchang, 330006, Jiangxi, People's Republic of China.
Abstract:
Spinal cord injury (SCI) can cause secondary brain changes, leading to hypomyelination in the dorsolateral prefrontal cortex (dlPFC). Some studies have shown that notch signaling pathway activation can regulate oligodendrocyte maturation and myelination. The aim of this study was to investigate whether inhibition of the Notch signaling pathway can alleviate hypomyelination in the dlPFC caused by SCI. Moreover, we further investigated whether the changes in myelination in the dlPFC are associated with neuropathic pain following SCI. We established a mouse model of SCI and observed the changes in mechanical and thermal hyperalgesia. Western blotting and immunofluorescence were used to analyze the changes in myelination in the dlPFC. The results indicated the existence of a relationship between activation of the Notch signaling pathway and hypomyelination in the dlPFC and confirmed the existence of a relationship between hypomyelination in the dlPFC and decreases in mechanical and thermal hyperalgesia thresholds. In conclusion, these results suggested that the Notch signaling pathway is activated after SCI, leading to hypomyelination in the dlPFC, and that DAPT can inhibit the Notch signaling pathway and improve mechanical and thermal hyperalgesia thresholds. Our findings provide a new target for the treatment of neuropathic pain caused by SCI.
Insights
Spinal cord injury causes brain hypomyelination, linked to neuropathic pain. Inhibiting the Notch signaling pathway with DAPT may treat this pain by improving myelination in the dorsolateral prefrontal cortex.
Area of Science:
- Neuroscience
- Cell Biology
- Pathology
Background:
- Spinal cord injury (SCI) can induce secondary brain alterations, specifically hypomyelination in the dorsolateral prefrontal cortex (dlPFC).
- The Notch signaling pathway plays a crucial role in regulating oligodendrocyte development and myelination processes.
- Neuropathic pain is a common and debilitating consequence of SCI.
Purpose of the Study:
- To investigate if inhibiting the Notch signaling pathway can mitigate SCI-induced hypomyelination in the dlPFC.
- To explore the association between dlPFC myelination changes and the development of neuropathic pain post-SCI.
Main Methods:
- Establishment of a mouse model of spinal cord injury.
- Assessment of mechanical and thermal hyperalgesia to evaluate neuropathic pain.
- Analysis of myelination changes in the dlPFC using Western blotting and immunofluorescence.
Main Results:
- Activation of the Notch signaling pathway was observed following SCI, correlating with dlPFC hypomyelination.
- Hypomyelination in the dlPFC was found to be associated with reduced thresholds for mechanical and thermal hyperalgesia.
- Treatment with DAPT, a Notch inhibitor, improved hyperalgesia thresholds, suggesting a reversal of myelination deficits.
Conclusions:
- The Notch signaling pathway is activated after SCI, contributing to hypomyelination in the dlPFC.
- DAPT effectively inhibits the Notch pathway, ameliorating neuropathic pain symptoms by improving myelination.
- Targeting the Notch signaling pathway presents a potential therapeutic strategy for managing SCI-related neuropathic pain.
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