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Reversible endoneurial changes after nerve injury.

M Röyttä, V Salonen, J Peltonen

Acta Neuropathologica

|January 1, 1987

Summary

Endoneurial compartmentation supports axonal regeneration after sciatic nerve injury. Fibroblast-like cells form structures that aid nerve repair, highlighting their role in maintaining nerve integrity during degeneration and regeneration.

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Area of Science:

Neuroscience
Cell Biology
Regenerative Medicine

Background:

Wallerian degeneration is a critical process following nerve injury.
Schwann cells and endoneurial cells play vital roles in nerve repair.
Understanding endoneurial changes is key to improving nerve regeneration strategies.

Purpose of the Study:

To investigate endoneurial cellular and structural changes during Wallerian degeneration and regeneration in the rat sciatic nerve.
To elucidate the role of endoneurial fibroblasts in nerve repair.
To examine the ultrastructural modifications of the endoneurium post-axotomy.

Main Methods:

Rat sciatic nerve axotomy with two models: free nerve ends for regeneration and sutured ends to prevent regeneration.
Light and electron microscopy to observe cellular and structural changes over 8 weeks.
Histological analysis of axonal degeneration, myelin phagocytosis, and fibroblast activity.

Main Results:

Wallerian degeneration observed within 2 weeks, including axonal breakdown and myelin phagocytosis.
Endoneurial fibroblasts formed circular, fascicle-like structures around Schwann cell columns (Bands of Büngner).
These structures were more prominent in non-regenerating nerves, while diminishing during regeneration, with fibroblasts showing phagocytic activity and basement membrane interaction.

Conclusions:

Reversible endoneurial compartmentation is crucial for maintaining nerve structure.
These compartmentation structures provide support for axonal regeneration alongside the Bands of Büngner.
Endoneurial fibroblasts actively participate in nerve repair through phagocytosis and matrix remodeling.

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