Related Experiment Video
Updated: Nov 15, 2025
08:47
Identifying Microglia and Peripheral Infiltrating Macrophages in the Injured Spinal Cords Using Flow Cytometry
Published on: June 24, 2025
397
Spinal macrophages resolve nociceptive hypersensitivity after peripheral injury
Jesse K Niehaus1, Bonnie Taylor-Blake2, Lipin Loo2
1UNC Neuroscience Center, The University of North Carolina at Chapel Hill, Chapel Hill, NC 27599, USA; Neuroscience Curriculum, The University of North Carolina at Chapel Hill, Chapel Hill, NC 27599, USA.
Neuron
|March 5, 2021
Summary
Spinal macrophages resolve neuropathic pain by reducing inflammation. Nerve injury dampens this response, but boosting anti-inflammatory signals in macrophages promotes long-term pain recovery.
Area of Science:
- Neuroscience
- Immunology
- Pain Research
Background:
- Peripheral nerve injury triggers persistent neuroinflammation, contributing to chronic neuropathic pain.
- The endogenous cells responsible for resolving spinal inflammation after nerve injury remain unidentified.
Purpose of the Study:
- To identify endogenous cells that resolve spinal inflammation and neuropathic pain.
- To investigate the role of MRC1+ spinal macrophages in pain resolution.
Main Methods:
- Single-cell RNA sequencing (scRNA-seq) in mice.
- Macrophage depletion and Cd163 gene expression manipulation.
- Assessment of glial activation and pain hypersensitivity.
Main Results:
- MRC1+ spinal macrophages upregulated anti-inflammatory mediator Cd163 after superficial injury (SI).
- This response was diminished in nerve-injured animals, correlating with persistent pain.
- Macrophage depletion worsened neuroinflammation and pain; Cd163 expression alleviated pain and neuroinflammation.
Conclusions:
- MRC1+ spinal macrophages limit neuroinflammation and resolve pain by restraining glial activation.
- Nerve-injured macrophages show a reduced anti-inflammatory response but can be therapeutically modulated for pain recovery.
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