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Autoimmune reactions in patients with M-component and peripheral neuropathy
V Jønsson1, H D Schrøder, W Trojaborg
1Department of Haematology L, Rigshospitalet, University of Copenhagen, Denmark.
Journal of Internal Medicine
|August 1, 1992
Summary
This study links M-component, a protein abnormality, with autoimmune neuropathies. Autoantibodies targeting nerve structures were identified, particularly in demyelinating forms involving myelin-associated glycoproteins (MAG).
Area of Science:
- Neurology
- Immunology
- Oncology
Background:
- Autoimmune peripheral neuropathies can be associated with monoclonal gammopathies.
- Understanding the specific targets of autoantibodies in these conditions is crucial for diagnosis and treatment.
Observation:
- Seventeen patients with autoimmune axonal or demyelinating peripheral neuropathy and M-component were studied.
- M-component was linked to monoclonal gammopathy of undetermined significance (MGUS), chronic lymphocytic leukemia (CLL), Waldenström's disease, and myeloma.
- Immunohistology revealed antibody binding to nerve structures, mirroring the M-component's immunoglobulin class and light chain.
Findings:
- In IgM M-component cases, neuropathy resulted from IgM binding to myelin-associated glycoproteins (MAG).
- Axonal neuropathies showed IgG binding to nerve connective tissue in 50% of cases, with IgM and IgD also implicated.
- No central nervous system involvement was observed.
Implications:
- The findings highlight specific antibody targets in M-component-associated neuropathies, aiding in understanding pathogenesis.
- Treatment challenges exist, with limited response to immunosuppression in acute cases.
- Co-expression of autoimmune phenomena suggests cross-reactivity between autoantibodies and tissue autoantigens.