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Motoneuron death after sciatic nerve section in newborn rats.

H Schmalbruch1

  • 1Institute of Neurophysiology, University of Copenhagen, Blegdamsvej 3C DK-2200 Copenhagen, Denmark.

The Journal of Comparative Neurology
|February 3, 2009
PubMed
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Sciatic nerve injury in newborn rats causes significant motor neuron loss. Recovery is limited, with sensory axons regenerating into muscles, but muscle fibers are not reinnervated.

Area of Science:

  • Neuroscience
  • Developmental Biology
  • Regenerative Medicine

Background:

  • Neonatal sciatic nerve transection leads to substantial motoneuron loss.
  • Adult sciatic nerves contain approximately 7,640 myelinated fibers, with 1,650 identified as motor axons.

Purpose of the Study:

  • To investigate the long-term effects of neonatal sciatic nerve injury on motoneuron survival and axonal regeneration.
  • To determine the critical period for retrograde loss of motoneurons following sciatic nerve axotomy.

Main Methods:

  • Sciatic nerve transection and crush injuries were performed on rats at different neonatal ages.
  • Histological analysis quantified myelinated fibers in ventral roots and sciatic nerves.
  • Horseradish peroxidase (HRP) tracing was used to assess motoneuron survival.

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Main Results:

  • Cutting the sciatic nerve at birth resulted in a deficit of 1,700 motor axons and depleted motoneuron pools.
  • Nerve section at 1 week old caused a deficit of 1,030 ventral root fibers, while section at 4 weeks old did not lead to retrograde loss.
  • Nerve crush at birth resulted in a deficit of 1,230 fibers due to incomplete axonal severance.

Conclusions:

  • Neonatal sciatic nerve injury causes irreversible motoneuron loss, with a critical period for vulnerability in the first week of life.
  • While sensory axons can regenerate into denervated muscles, reinnervation does not occur, leading to muscle atrophy and replacement by fat.
  • Axotomy in early life leads to significant deficits in motor axons and motoneuron populations.