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Embryonic cord transplants in peripheral nerve restore skeletal muscle function.
C K Thomas1, D E Erb, R M Grumbles
1The Miami Project to Cure Paralysis and Department of Neurological Surgery, University of Miami School of Medicine, Miami 33136, Florida, USA. cthomas@miamiproject.med.miami.edu
Journal of Neurophysiology
|July 19, 2000
Summary
Transplanting embryonic spinal cord cells into denervated rat nerves enabled muscle reinnervation. This novel approach shows potential for restoring limb movement after nerve injury.
Area of Science:
- Neuroscience
- Regenerative Medicine
- Skeletal Muscle Physiology
Background:
- Skeletal muscle atrophy after denervation impairs functional recovery.
- Restoring muscle function requires successful reinnervation and contraction.
Purpose of the Study:
- To evaluate the physiological reinnervation of medial gastrocnemius muscle using transplanted embryonic spinal cord cells.
- To determine if reinnervated muscle can contract, generate force, and exhibit fatigue resistance.
Main Methods:
- Transplantation of embryonic day 14-15 (E14-E15) ventral spinal cord cells into adult Fischer rat tibial nerve stumps.
- Physiological assessment of medial gastrocnemius reinnervation 12 weeks post-transplantation via electrical stimulation.
- Confirmation of innervation dependence by sectioning medial gastrocnemius nerves.
Main Results:
- 33% of transplanted rats (4/12) exhibited medial gastrocnemius contractions producing ankle movement.
- Reinnervated muscles demonstrated fatigue resistance over 5 hours of intermittent stimulation without EMG depression.
- Contractions were confirmed to be innervation-dependent.
Conclusions:
- Embryonic spinal cord cell transplantation can achieve functional reinnervation of denervated skeletal muscle.
- This strategy offers a potential method to salvage denervated muscle and restore limb movement.
- Further research may optimize this approach for clinical applications in nerve injury and disease.