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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
PubMed
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.

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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.

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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.