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JC virus and multiple sclerosis: a refutation?
R H Boerman1, J J Bax, J A Beekhuis-Brussee
1Department of Neurology, University Hospital of Leiden, The Netherlands.
Abstract:
Polyomavirus JC (JCV) has been implicated in the etiology of multiple sclerosis (MS), because it causes progressive multifocal leukoencephalopathy (PML), a multifocal demyelinating disease with many microscopical similarities to MS. During childhood, the virus establishes a latent infection in the kidneys, which can be reactivated in immunocompromised patients. During reactivation, the virus is shed in the urine. The kidney is the only known site of latent infection and reactivation. Therefore, excretion of the virus in the urine of MS patients is to be expected, if reactivated JCV is involved in the etiology of MS. We studied urine samples of 53 patients with definitive MS and of 53 controls matched for age and sex. We found no evidence of active JCV infection in MS. The hypothesis of a polyomaviral etiology of MS is not supported by the results of this study.
Insights
This study investigated the link between Polyomavirus JC (JCV) and multiple sclerosis (MS). Researchers found no evidence of active JCV infection in MS patients, suggesting JCV does not cause MS.
Area of Science:
- Neurovirology
- Immunology
- Infectious Diseases
Background:
- Polyomavirus JC (JCV) is linked to progressive multifocal leukoencephalopathy (PML), a demyelinating disease similar to multiple sclerosis (MS).
- JCV establishes latent infections in the kidneys, with potential for reactivation and shedding in urine, particularly in immunocompromised individuals.
Purpose of the Study:
- To investigate the potential role of Polyomavirus JC (JCV) in the etiology of multiple sclerosis (MS).
- To determine if active JCV infection, indicated by viral shedding in urine, is present in MS patients.
Main Methods:
- Analysis of urine samples from 53 patients diagnosed with definitive MS.
- Comparison with urine samples from 53 age- and sex-matched healthy controls.
- Testing for evidence of active JCV infection.
Main Results:
- No evidence of active Polyomavirus JC (JCV) infection was detected in the urine samples of multiple sclerosis (MS) patients.
- The study found no correlation between JCV and MS in the investigated cohort.
Conclusions:
- The findings do not support the hypothesis that Polyomavirus JC (JCV) plays a role in the etiology of multiple sclerosis (MS).
- Further research may be needed to explore other potential viral or environmental factors in MS pathogenesis.