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Evidence for autoimmunity in amyotrophic lateral sclerosis
S H Appel1, R G Smith, J I Engelhardt
1Department of Neurology, Baylor College of Medicine, Houston, TX 77030.
Journal of the Neurological Sciences
|July 1, 1994
Summary
Autoimmune mechanisms may contribute to Amyotrophic Lateral Sclerosis (ALS). In an animal model, immunoglobulin G (IgG) from ALS patients altered neuromuscular junction function, suggesting a role in motoneuron damage.
Area of Science:
- Neuroimmunology
- Neurology
Background:
- The exact cause of Amyotrophic Lateral Sclerosis (ALS) remains unknown.
- Growing evidence suggests autoimmune processes may be involved in motoneuron degeneration.
Purpose of the Study:
- To investigate the role of autoimmune mechanisms in ALS pathogenesis.
- To explore the effects of immunoglobulin G (IgG) from ALS patients on neuromuscular junctions.
Main Methods:
- Induction of experimental autoimmune gray matter disease in an animal model.
- Analysis of inflammatory markers and IgG presence in animal models and human ALS.
- Passive transfer of ALS IgG to mice to assess physiological changes.
Main Results:
- Experimental autoimmune gray matter disease showed motoneuron loss, inflammation, and IgG deposition.
- Human ALS samples revealed IgG within upper and lower motoneurons, alongside immune cell infiltration.
- ALS IgG passively transferred neuromuscular junction abnormalities and enhanced acetylcholine release in mice.
- ALS IgG was found to selectively interact with and alter calcium channel function.
Conclusions:
- Autoimmune mechanisms, particularly involving IgG, are implicated in motoneuron destruction in ALS.
- ALS IgG may directly contribute to neuromuscular junction dysfunction.
- Further research into autoimmune pathways could reveal new therapeutic targets for ALS.