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Updated: Jun 18, 2025
Intravital Imaging of Axonal Interactions with Microglia and Macrophages in a Mouse Dorsal Column Crush Injury
Published on: November 23, 2014
Dynamic development of microglia and macrophages after spinal cord injury
Hu-Yao Zhou1,2, Xia Wang1,2, Yi Li2
1Institute of Life Sciences, Chongqing Medical University, Chongqing, China.
Abstract:
JOURNAL/nrgr/04.03/01300535-202512000-00029/figure1/v/2025-01-31T122243Z/r/image-tiff Secondary injury following spinal cord injury is primarily characterized by a complex inflammatory response, with resident microglia and infiltrating macrophages playing pivotal roles. While previous studies have grouped these two cell types together based on similarities in structure and function, an increasing number of studies have demonstrated that microglia and macrophages exhibit differences in structure and function and have different effects on disease processes. In this study, we used single-cell RNA sequencing and spatial transcriptomics to identify the distinct evolutionary paths of microglia and macrophages following spinal cord injury. Our results showed that microglia were activated to a pro-inflammatory phenotype immediately after spinal cord injury, gradually transforming to an anti-inflammatory steady state phenotype as the disease progressed. Regarding macrophages, our findings highlighted abundant communication with other cells, including fibroblasts and neurons. Both pro-inflammatory and neuroprotective effects of macrophages were also identified; the pro-inflammatory effect may be related to integrin β2 ( Itgb2 ) and the neuroprotective effect may be related to the oncostatin M pathway. These findings were validated by in vivo experiments. This research underscores differences in the cellular dynamics of microglia and macrophages following spinal cord injury, and may offer new perspectives on inflammatory mechanisms and potential therapeutic targets.
Insights
Microglia and macrophages exhibit distinct roles in spinal cord injury inflammation. Microglia shift from pro- to anti-inflammatory, while macrophages show complex communication and both pro-inflammatory and neuroprotective functions.
Area of Science:
- Neuroscience
- Immunology
- Genomics
Background:
- Spinal cord injury triggers inflammation involving microglia and macrophages.
- Previous research often grouped these cells, but distinct functions are emerging.
- Understanding their unique roles is crucial for therapeutic development.
Purpose of the Study:
- To differentiate the evolutionary paths and functions of microglia and macrophages post-spinal cord injury.
- To identify specific molecular pathways involved in their distinct responses.
- To validate findings through in vivo experiments.
Main Methods:
- Single-cell RNA sequencing
- Spatial transcriptomics
- In vivo validation experiments
Main Results:
- Microglia transition from a pro-inflammatory to an anti-inflammatory state after injury.
- Macrophages exhibit extensive communication with fibroblasts and neurons.
- Macrophages display both pro-inflammatory (Itgb2-related) and neuroprotective (oncostatin M pathway) effects.
Conclusions:
- Microglia and macrophages have distinct cellular dynamics following spinal cord injury.
- These differences offer new insights into inflammatory mechanisms.
- Identifying unique pathways may reveal novel therapeutic targets for spinal cord injury.
