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Evidence for developmental plasticity of the rubrospinal tract. Studies using the North American opossum
1Department of Anatomy, Ohio State University, College of Medicine, Columbus 43210.
Insights
Rubral axons can grow around spinal cord lesions in developing opossums, indicating a critical developmental window for this regenerative capacity. This finding offers insights into potential strategies for nerve repair.
Area of Science:
- Neuroscience
- Developmental Biology
- Regenerative Medicine
Background:
- The rubrospinal tract is crucial for motor control.
- Understanding axonal regeneration after injury is vital for therapeutic development.
- The North American opossum offers a unique model for studying postnatal nervous system development.
Purpose of the Study:
- To investigate the capacity of rubral axons to grow around lesions in the rubrospinal tract.
- To determine if a critical period for axonal growth exists during development.
- To utilize the opossum's immature developmental state for studying the rubrospinal tract.
Main Methods:
- Axonal tracing techniques were employed.
- Lesions were introduced to the rubrospinal tract at specific developmental stages.
- Opossums, born in an immature state, were used to observe postnatal development.
Main Results:
- Rubral axons demonstrated the ability to grow around rubrospinal tract lesions.
- This regenerative capacity was observed during early developmental stages.
- Evidence suggests a critical period for this axonal regrowth exists.
Conclusions:
- Axonal plasticity and regenerative potential exist in the developing rubrospinal tract.
- The timing of injury relative to development significantly influences axonal regrowth.
- The North American opossum is a valuable model for studying neural development and repair mechanisms.
Abstract:
Using axonal tracing techniques we have shown that rubral axons are capable of growing around lesions of the rubrospinal tract during early stages of development in the North American opossum and that a critical period for such growth exists. The opossum was employed for study because it is born in a very immature state 12-13 days after conception and the entire development of its rubrospinal tract occurs postnatally.