Strong EBV-specific CD8+ T-cell response in patients with early multiple sclerosis

Area of Science:

• Immunology
• Neuroscience
• Virology

Background:

• Epstein-Barr virus (EBV) is implicated in multiple sclerosis (MS) pathogenesis.
• CD8+ T cells play a crucial role in MS and viral control.
• Previous studies primarily used serology to link EBV and MS.

Purpose of the Study:

• To investigate the frequency and activation of EBV-specific CD8+ T cells in MS patients.
• To explore the association between EBV and different stages of MS.
• To compare EBV-specific responses with cytomegalovirus (CMV)-specific responses.

Main Methods:

• Assessed cellular immune responses (proliferation, ELISpot) and humoral responses (antibodies).
• Analyzed EBV- and CMV-specific CD4+ and CD8+ T-cell responses in 164 subjects.
• Included patients with clinically isolated syndrome (CIS), various MS stages, other neurological diseases, and healthy controls.

Main Results:

• Significantly higher EBV-specific CD8+ T-cell responses in CIS patients compared to other groups.
• EBV-specific CD8+ T-cell responses decreased over time in CIS patients.
• No differences in CD4+ T-cell responses or CMV-specific responses across groups.

Conclusions:

• Elevated CD8+ T-cell activation against EBV, but not CMV, occurs early in MS.
• These findings support the hypothesis that EBV may be associated with MS onset.
• EBV-specific CD8+ T-cell frequency correlates with early disease stages.