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Related Experiment Videos

Autoimmune mechanisms in peripheral neuropathies.

R K Yu1, T Ariga, T Kohriyama

  • 1Department of Biochemistry and Molecular Biophysics, Medical College of Virginia, Virginia Commonwealth University, Richmond 23298-0614.

Annals of Neurology
|January 1, 1990
PubMed
Summary

Autoimmune responses targeting sulfoglucuronyl glycolipids (SGGLs) and myelin-associated glycoprotein (MAG) may cause demyelinating neuropathy. These findings suggest SGGLs are key players in immune-mediated peripheral nervous system disorders.

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Area of Science:

  • Neuroimmunology
  • Glycosphingolipid Chemistry
  • Peripheral Neuropathy Research

Background:

  • Patients with demyelinating neuropathy and plasma cell dyscrasia exhibit IgM monoclonal antibodies.
  • These antibodies target a shared carbohydrate epitope on myelin-associated glycoprotein (MAG) and specific acidic glycolipids.

Purpose of the Study:

  • To elucidate the structure of novel acidic glycolipids involved in neuropathy.
  • To investigate the role of these glycolipids and MAG in the pathogenesis of immune-mediated neuropathy.

Main Methods:

  • Structural elucidation of two acidic glycolipids, termed sulfoglucuronyl glycolipids (SGGLs).
  • Detection of SGGLs in peripheral nervous system (PNS) myelin, axolemma, and ganglia.
  • Sensitization of rabbits with sulfoglucuronyl paragloboside (SGPG) to generate antibodies.

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Main Results:

  • SGGLs were identified as a new class of glycosphingolipids.
  • Antibodies against SGPG also reacted with MAG.
  • Rabbits developed neuropathy symptoms including weakness and slowed nerve conduction velocity.
  • SGPG was found in rat brain microvessels, suggesting a role in blood-nerve barrier permeability.

Conclusions:

  • An autoimmune response against the sulfoglucuronyl residue may contribute to immune-mediated neuropathy.
  • SGGLs and MAG are potential targets in autoimmune neuropathies.
  • Interaction with endothelial cell-bound antigens might facilitate autoantibody entry into the nervous system.