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EBV and MS: Major cause, minor contribution or red-herring?
Sean Burnard1, Jeannette Lechner-Scott2, Rodney J Scott3
1Medical Genetics, Hunter Medical Research Institute, School of Biomedical Sciences, Faculty of Health and Medicine, University of Newcastle, NSW, Australia.
Abstract:
Multiple Sclerosis (MS) is a chronic neurological disease with genetic and environmental risk factors. Epstein Barr-Virus (EBV) has been closely associated with MS but with a significant amount of conflicting evidence. Some of the evidence for EBV involvement in MS includes: almost 100% of MS patients showing past EBV infection, an association with Infectious Mononucleosis (acute EBV infection), higher titres of EBV antibodies associated with an increased risk of MS development, and an overall altered immune response to EBV found in peripheral blood and the CNS of MS patients. However, evidence for EBV presence in the CSF and T cell responses to EBV in MS have been particularly conflicting. Several hypotheses have been proposed for direct and indirect EBV involvement in MS such as 1) Molecular Mimicry 2) Mistaken Self 3) Bystander Damage and 4) Autoreactive B cells infected with EBV. More recently, an association between EBV and human endogenous retrovirus in MS has been shown, which may provide an alternative pathogenetic target for MS treatment. However, if EBV is not the major contributor to MS and is instead one of several viral or infectious agents able to elicit a similar altered immune response, MS development may be the result of a failure of viral clearance in general. This review aims to evaluate the evidence for the currently discussed theories of EBV involvement in MS pathogenesis.
Insights
Multiple Sclerosis (MS) may be linked to Epstein-Barr Virus (EBV) due to altered immune responses and proposed mechanisms like molecular mimicry. However, conflicting evidence suggests EBV might not be the sole cause, potentially indicating a broader viral clearance failure.
Area of Science:
- Neuroimmunology
- Virology
- Chronic Neurological Diseases
Background:
- Multiple Sclerosis (MS) is a chronic neurological disease with known genetic and environmental risk factors.
- Epstein-Barr Virus (EBV) is strongly associated with MS, but evidence remains conflicting.
- Key evidence includes high EBV seroprevalence in MS patients and altered immune responses to EBV.
Purpose of the Study:
- To review and evaluate current theories on Epstein-Barr Virus (EBV) involvement in Multiple Sclerosis (MS) pathogenesis.
- To analyze conflicting evidence regarding EBV's role in MS.
- To explore proposed mechanisms of EBV-induced MS.
Main Methods:
- Literature review of studies investigating the association between Epstein-Barr Virus (EBV) and Multiple Sclerosis (MS).
- Analysis of evidence supporting and refuting EBV's direct or indirect role in MS.
- Evaluation of proposed pathogenetic mechanisms, including molecular mimicry and bystander damage.
Main Results:
- Nearly all MS patients exhibit past EBV infection, with associations to infectious mononucleosis and higher antibody titers.
- Conflicting data exists regarding EBV presence in cerebrospinal fluid (CSF) and T-cell responses in MS patients.
- Hypotheses include molecular mimicry, mistaken self, bystander damage, and EBV-infected autoreactive B cells.
Conclusions:
- The precise role of Epstein-Barr Virus (EBV) in Multiple Sclerosis (MS) pathogenesis requires further investigation.
- Conflicting evidence necessitates a critical evaluation of proposed mechanisms.
- Alternative hypotheses, including a general failure of viral clearance, warrant consideration in MS etiology.
