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Neuronal plasticity and formation of new synaptic contacts follow pyramidal lesions and neutralization of Nogo-A: a light and electron microscopic study in the pontine nuclei of adult rats.
Journal article

Neuronal plasticity and formation of new synaptic contacts follow pyramidal lesions and neutralization of Nogo-A: a light and electron microscopic study in the pontine nuclei of adult rats.

  • 2001-04-12
Published in:
  • The Journal of comparative neurology. - 2001
Animals
Cerebral Cortex
Male
Microscopy, Electron
Myelin Proteins
Nerve Fibers
Neuronal Plasticity
Nogo Proteins
Pons
Pyramidal Tracts
Rats
Rats, Inbred Lew
Synapses
Synaptic Transmission
English Regeneration and compensatory sprouting are limited after lesions in the mature mammalian central nervous system in contrast to the developing central nervous system (CNS). After neutralization of the growth inhibitor Nogo-A, however, massive sprouting and rearrangements of fiber connections occurred after unilateral pyramidal tract lesions in adult rats: Corticofugal fibers from the lesioned side crossed the midline of the brainstem and innervated the contralateral basilar pontine nuclei. To determine whether these newly sprouted fibers formed synaptic contacts, we analyzed the corticofugal fibers in the basilar pontine nuclei contralateral to the lesion by light and electron microscopy 2 weeks after pyramidotomy and treatment with the Nogo-A-inhibiting monoclonal antibody IN-1 (mAb IN-1). The mAb IN-1, but not a control antibody, led to structural changes in the basilar pons ipsilateral and contralateral to the lesion site. Fibers sprouted across the pontine midline and terminated topographically. They established asymmetric synaptic contacts with the characteristics of normal corticopontine terminals. These results show that adult CNS fibers are able to sprout and to form new synaptic contacts after a lesion when a growth-permissive microenvironment is provided.
Language
  • English
Open access status
closed
Identifiers
Persistent URL
https://sonar.ch/global/documents/47000
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