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  4. NT3-chitosan elicits robust endogenous neurogenesis to enable functional recovery after spinal cord injury

NT3-chitosan elicits robust endogenous neurogenesis to enable functional recovery after spinal cord injury

PNAS, 2015 · DOI: 10.1073/pnas.1510194112 · Published: October 27, 2015

Spinal Cord InjuryRegenerative MedicineNeurology

Simple Explanation

This study explores a new approach to treat spinal cord injuries by stimulating the body's own neural stem cells to repair the damage. The approach involves using a special material called chitosan combined with a protein called neurotrophin-3 (NT3). When the NT3-chitosan material was placed in a completely severed spinal cord in rats, it helped the rats regain some sensory and motor functions. This suggests that the material created a good environment for the stem cells to grow and form new connections in the injured spinal cord. The study indicates that encouraging the body's own stem cells to create new nerve cells could be a promising way to treat spinal cord injuries.

Study Duration
1 year
Participants
Female Wistar rats weighing 200–220 g
Evidence Level
Not specified

Key Findings

  • 1
    NT3-chitosan, when inserted into a 5 mm gap of completely transected and excised rat thoracic spinal cord, elicited robust activation of endogenous neural stem cells.
  • 2
    The activated neural stem cells formed functional neural networks, which interconnected the severed ascending and descending axons, resulting in sensory and motor behavioral recovery.
  • 3
    Enhancing endogenous neurogenesis by NT3-chitosan could be a novel strategy for treatment of SCI.

Research Summary

The study investigates the potential of NT3-chitosan biomaterial to promote regeneration and functional recovery after spinal cord injury (SCI) by activating endogenous neural stem cells (NSCs). Results showed that NT3-chitosan elicited robust activation of endogenous NSCs in the injured spinal cord, leading to the formation of functional neural networks and sensory/motor behavioral recovery in rats with completely transected spinal cords. The findings suggest that enhancing endogenous neurogenesis with NT3-chitosan could be a novel therapeutic strategy for SCI.

Practical Implications

Therapeutic Strategy

NT3-chitosan can be further explored as a therapeutic strategy for spinal cord injuries.

Drug Delivery

Chitosan serves as a biodegradable material for drug delivery of NT3.

Neurogenesis

Enhancing endogenous neurogenesis could be a way to treat spinal cord injuries.

Study Limitations

  • 1
    The study was conducted on rats, and further research is needed to determine if the results can be translated to humans.
  • 2
    The exact contribution of regenerated ascending and descending fibers, as well as new fibers originating from newly regenerated neuronal cells, awaits future studies.
  • 3
    The initial application of Ara-C for 2 wk not only suppressed NSC activation, but also inhibited proliferation of other cells, including infiltrating immune cells and endothelial cells.

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