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Evidence for multiple sclerosis as an infectious disease
S D Cook1, C Rohowsky-Kochan, S Bansil
1Department of Neurosciences, UMDNJ-New Jersey Medical School, Newark, USA.
Abstract:
Evidence for a viral cause of multiple sclerosis (MS) is indirect since no infectious agent has been reproducibly isolated from MS tissues nor has viral genome or antigen been consistently identified. The occurrence of spontaneous human and animal models of demyelination, serologic studies, and epidemiologic data provide persuasive circumstantial evidence for an infectious trigger in this disease. Potential mechanisms for viral induced demyelination include persistent infection of host tissues or immune mediated organ damage either in the presence or absence of the infectious agent. Any proposed viral candidate should cause demyelination in animals or man and the pattern of infection should be consistent with the unique geographic features of MS epidemiology. In addition, serologic studies should support an infection by the agent and/or viral genome should be detected in MS tissues. At this time no virus can be unequivocally linked to MS but cumulative evidence is more supportive of canine distemper virus than other viruses.
Insights
While no virus is definitively linked to multiple sclerosis (MS), circumstantial evidence suggests a viral trigger. Canine distemper virus shows the most promise among potential infectious agents causing MS.
Area of Science:
- Neurology
- Virology
- Immunology
Background:
- Direct evidence linking viruses to multiple sclerosis (MS) is lacking, as no infectious agent has been consistently isolated from MS tissues.
- Indirect evidence, including animal models, serologic studies, and epidemiology, suggests an infectious trigger for MS.
- Proposed mechanisms involve persistent viral infection or immune-mediated damage leading to demyelination.
Purpose of the Study:
- To review the evidence for a viral cause of multiple sclerosis (MS).
- To evaluate potential viral candidates based on established criteria for MS pathogenesis.
- To assess the cumulative evidence supporting specific viruses, such as canine distemper virus.
Main Methods:
- Review of existing literature on MS, viral infections, and demyelination.
- Analysis of serologic and epidemiologic data related to MS and potential viral agents.
- Evaluation of animal models of viral-induced demyelination.
Main Results:
- No virus has been unequivocally identified as the cause of MS.
- Canine distemper virus (CDV) presents the most compelling, albeit indirect, evidence among proposed viral candidates.
- CDV fits the criteria for causing demyelination and aligns with MS epidemiological patterns.
Conclusions:
- The cumulative evidence suggests a potential viral etiology for MS, with CDV being a leading candidate.
- Further research is needed to definitively establish a viral link and understand the mechanisms of viral-induced demyelination in MS.
- Current evidence remains circumstantial, necessitating more direct proof for a definitive viral cause of MS.