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Spontaneously regenerative corticospinal neurons in mice
Biorxiv : the Preprint Server for Biology
|September 24, 2024
Summary
Researchers discovered a unique class of corticospinal neurons (CSNs) that project to the same side of the spinal cord. These spontaneously regenerative neurons offer new hope for spinal cord injury research.
Area of Science:
- Neuroscience
- Spinal Cord Injury Research
- Developmental Neurobiology
Background:
- Corticospinal neurons (CSNs) primarily project contralaterally, but a subset projects ipsilaterally.
- The function and properties of ipsilateral CSNs remain under-investigated.
Purpose of the Study:
- To characterize the spatial and molecular properties of ipsilateral CSNs and their targets.
- To investigate the regenerative potential of ipsilateral CSNs after spinal cord injury.
Main Methods:
- Analysis of spatial and molecular features of ipsilateral axons in mice.
- Barcode-based reconstruction of ipsilateral axons.
- Assessment of regenerative capacity post-spinal cord injury.
Main Results:
- Ipsilateral CSNs primarily target the ventral horn, including motor neurons.
- A distinct class of bilaterally-projecting CSNs with unique cortical distribution was identified.
- Ipsilaterally-projecting CSNs (IP-CSNs) exhibit molecular similarities to embryonic-like regenerating neurons.
- IP-CSNs demonstrate spontaneous regeneration after spinal cord injury.
Conclusions:
- Discovery of spontaneously regenerative IP-CSNs offers a novel avenue for spinal cord injury research.
- IP-CSNs retain juvenile-like regenerative characteristics, suggesting this may be more widespread in adult nervous systems.
