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Human herpesvirus 6 in the pathogenesis of multiple sclerosis
1Department of Virology, Swedish Institute for Infectious Disease Control, Solna. malin_enbom@hotmail.com
Abstract:
Multiple sclerosis (MS) is one of the most common disabling neurological diseases affecting young adults. It is a chronic disease characterised by inflammation and demyelination. The aetiology of MS is still unknown, but involvement of viruses has been suspected for many years. Recently much interest has focused on human herpesvirus 6 (HHV-6), since the virus has been detected in MS plaques in the brain and patients with MS have been shown to have an aberrant immune response to HHV-6. Results from different studies are, however, conflicting and in the light of the long list of previous claims to have found the viral aetiology of MS it is necessary to interpret the HHV-6 findings with great caution. Possible mechanisms for virally induced demyelination and autoimmunity are discussed in this review, and the evidence for and against a role for HHV-6 in MS is summarised.
Insights
This review examines the potential role of human herpesvirus 6 (HHV-6) in multiple sclerosis (MS), a disabling neurological disease. Evidence is conflicting, necessitating cautious interpretation of HHV-6 findings in MS etiology.
Area of Science:
- Neurology
- Virology
- Immunology
Background:
- Multiple sclerosis (MS) is a common, disabling neurological disease in young adults.
- MS is characterized by chronic inflammation and demyelination.
- The exact cause of MS remains unknown, with viral involvement a long-standing hypothesis.
Purpose of the Study:
- To review and summarize the evidence for and against a role of human herpesvirus 6 (HHV-6) in the etiology of MS.
- To discuss potential mechanisms of virally induced demyelination and autoimmunity in MS.
- To provide a cautious interpretation of current HHV-6 findings in MS.
Main Methods:
- Literature review of studies investigating HHV-6 in MS.
- Analysis of evidence for HHV-6 detection in MS lesions.
- Examination of immune responses to HHV-6 in MS patients.
Main Results:
- HHV-6 has been detected in MS plaques.
- MS patients show aberrant immune responses to HHV-6.
- Existing study results are conflicting, requiring careful consideration.
Conclusions:
- The role of HHV-6 in MS etiology is uncertain.
- Further cautious research is needed to clarify HHV-6's potential involvement.
- Mechanisms of viral-induced demyelination and autoimmunity in MS warrant further investigation.