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Non-neural-specific T lymphocytes can orchestrate inflammatory peripheral neuropathy
G K Harvey1, R Gold, H P Hartung
1Department of Medicine, University of Sydney, Australia.
Brain : a Journal of Neurology
|October 1, 1995
Summary
Non-neural T cells can infiltrate peripheral nerves, increasing blood-nerve barrier permeability. This process, especially with anti-myelin antibodies, can cause nerve damage and conduction failure in a dose-dependent manner.
Area of Science:
- Neuroimmunology
- Peripheral Nerve Disorders
Background:
- T lymphocytes are implicated in inflammatory peripheral nerve diseases like Guillain-Barré syndrome (GBS) and chronic inflammatory demyelinating polyneuropathy (CIDP).
- The role of non-neural-specific T cells in peripheral nerve pathology requires further elucidation.
Purpose of the Study:
- To investigate the pathological role of non-neural-specific T cells in peripheral nerve inflammation.
- To determine the effects of T cell infiltration on blood-nerve barrier (BNB) permeability and nerve function.
Main Methods:
- Lewis rats received systemic transfer of ovalbumin-specific activated T cells.
- Intraneural ovalbumin injection was performed to induce localized inflammation.
- Cellular infiltration, BNB permeability, demyelination, axonal degeneration, and nerve conduction were assessed.
Main Results:
- Ovalbumin injection led to rapid T cell and macrophage infiltration in the endoneurium.
- Cellular infiltration significantly increased BNB permeability.
- Higher T cell numbers resulted in Wallerian degeneration and nerve conduction failure.
- Lower T cell numbers caused conduction block and demyelination, exacerbated by anti-myelin antibodies.
Conclusions:
- Activated T cells lacking neural specificity can accumulate in peripheral nerves.
- These T cells can disrupt BNB permeability and orchestrate demyelination or axonal degeneration.
- The severity of nerve damage is dose-dependent and can be amplified by autoantibodies.