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Related Experiment Videos

The transitional zone and CNS regeneration.

J P Fraher1

  • 1Department of Anatomy, University College, Cork, Ireland. j.fraher@ucc.ie

Journal of Anatomy
|March 4, 2000
PubMed
Summary
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The central nervous system-peripheral nervous system transitional zone (TZ) is a key site for studying axon regeneration. Therapies like olfactory ensheathing cell transplantation show promise for enhancing nerve repair across this interface.

Area of Science:

  • Neuroscience
  • Cell Biology
  • Regenerative Medicine

Background:

  • Nerves connect to the central nervous system (CNS) via rootlets, forming a CNS-peripheral nervous system transitional zone (TZ).
  • This TZ features an interface between astrocytic CNS tissue and Schwann cell-ensheathed peripheral nervous system (PNS) tissue, with axons penetrating this barrier.
  • Rat spinal dorsal root TZs serve as a model for CNS axon regeneration, mimicking the gliotic response seen in CNS lesions.

Purpose of the Study:

  • To investigate the structure and function of the CNS-PNS transitional zone (TZ) in nerve regeneration.
  • To explore strategies for promoting axon regeneration across the TZ into the CNS.
  • To utilize the dorsal root TZ (DRTZ) for quantitative studies on regeneration.

Main Methods:

Related Experiment Videos

  • Characterization of the TZ interface and glial ensheathment (oligodendrocytes, Schwann cells, astrocytes).
  • Modeling CNS axon regeneration using rat spinal dorsal root TZs, observing gliosis and regeneration barriers.
  • Experimental approaches including transplantation of fetal dorsal root ganglia and cultured olfactory ensheathing cells (OECs).
  • Application of molecular factors to modulate the TZ environment.

    • Main Results:

    • The TZ exhibits distinct central (astrocytic) and peripheral (Schwann cell) components separated by an interface.
    • CNS axons regenerate through PNS endoneurial tubes but are impeded by the gliotic TZ tissue.
    • Transplantation of fetal ganglia and OECs, along with molecular factor application, facilitates axon regeneration into the CNS.
    • Ventral motoneuron axons show some capacity for unaided CNS regeneration via the TZ.

    Conclusions:

    • The CNS-PNS transitional zone is a critical site for understanding and promoting nerve regeneration.
    • Strategies involving cellular transplantation and molecular modulation offer potential for overcoming regeneration barriers at the TZ.
    • The DRTZ provides a valuable model for quantitative assessment of regeneration strategies across the CNS-PNS interface.