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Are anti-brain antibodies in multiple sclerosis directed to myelin basic protein? Studies employing the Shiverer
Abstract:
The dysmyelinating mouse mutant Shiverer has a severe and relatively selective deficiency of myelin basic protein (MBP) in the central and peripheral nervous system. Nevertheless, Shiverer brain and control-mouse brain showed similar antigenic titers when tested by a complement fixation assay against a panel of 14 multiple sclerosis (MS) sera and 6 MS CSF samples known to represent several specificities of antibrain antibodies. By analogy with experimental allergic encephalomyelitis, a sensitization to MBP has been proposed in MS. Our results, however, show that antibodies to other CNS antigens are quantitatively more important in this disease.
Insights
Multiple Sclerosis (MS) patients' antibodies target other central nervous system (CNS) antigens more than myelin basic protein (MBP). This challenges the hypothesis that MBP sensitization is the primary cause of MS.
Area of Science:
- Neuroimmunology
- Demyelinating Diseases
- Autoimmunity
Background:
- The Shiverer mouse model exhibits a significant deficiency in myelin basic protein (MBP), a key component of the myelin sheath.
- Multiple Sclerosis (MS) is an autoimmune disease characterized by damage to the myelin sheath in the central nervous system (CNS).
- A hypothesis suggested that sensitization to MBP might be a primary driver of MS pathogenesis, similar to experimental allergic encephalomyelitis.
Purpose of the Study:
- To investigate the antigenic targets of antibodies in Multiple Sclerosis (MS) patients.
- To compare antibody responses in MS patients to the Shiverer mouse model with a specific deficiency in myelin basic protein (MBP).
Main Methods:
- Complement fixation assay was used to measure antigenic titers.
- Shiverer mouse brain and control mouse brain tissues were used as antigens.
- Sera and cerebrospinal fluid (CSF) samples from Multiple Sclerosis (MS) patients were tested against these brain tissues.
Main Results:
- Shiverer mouse brain and control mouse brain showed similar antigenic titers when tested against MS patient samples.
- Antibodies from MS patients did not show a significantly higher affinity for the MBP-deficient Shiverer brain compared to control brain.
- This indicates that antibodies in MS patients are not predominantly directed against MBP.
Conclusions:
- Antibodies targeting other central nervous system (CNS) antigens are quantitatively more significant in Multiple Sclerosis (MS) than previously hypothesized.
- The findings challenge the direct link between MBP sensitization and MS pathogenesis.
- Further research is needed to identify the specific CNS antigens targeted by MS-associated antibodies.