Add time:08/23/2019         Source:sciencedirect.com

Multiple sclerosis (MS) is an inflammatory, demyelinating disease of the central nervous system. Both genetic and environmental factors contribute to disease susceptibility and two viruses associated with MS are human herpesvirus (HHV)-6A and HHV-6B, together referred to as HHV-6. This study characterized the plasma IgG antibody response against HHV-6 in MS patients (n = 446) and healthy controls (n = 487), and the relationship between MS susceptibility factors and the anti-HHV-6 response was investigated. In addition, 134 samples were further investigated for IgG against the early HHV-6 antigen p41. Antibody levels were measured with ELISA. The overall seroprevalence against HHV-6 was 90%, with no significant difference in positivity or levels between MS patients and controls. Interestingly, carriership of HLA-A∗02 and tobacco smoking was associated with lower anti-HHV-6 IgG levels (p = 0.0017 and p = 0.026 respectively), whereas females sex was associated with higher levels (p = 0.0090). No difference in IgG titers against p41 was observed between MS patients and controls. In conclusion, the IgG response against HHV-6 was associated with several factors that have previously been associated with MS susceptibility, possibly reflecting a relation between autoimmunity and how the immune system handles viral infections.

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