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T-cell reactivity to multiple myelin antigens in multiple sclerosis patients and healthy controls

N Hellings1, M Barée, C Verhoeven

  • 1Biomedisch Onderzoeksintituut DWI, Limburgs Universitair Centrum, Diepenbeek, Belgium.

Journal of Neuroscience Research
|February 15, 2001
PubMed

Insights

Multiple sclerosis patients exhibit diverse T-cell responses to myelin proteins like myelin basic protein (MBP) and myelin oligodendrocyte glycoprotein (MOG). MBP-reactive T-cells are activated in vivo, suggesting complex autoimmune mechanisms in MS.

Area of Science:

  • Neuroimmunology
  • Autoimmunity
  • Multiple Sclerosis Pathogenesis

Background:

  • Myelin proteins (MBP, PLP, MOG) are implicated as autoantigens in Multiple Sclerosis (MS).
  • The specific T-cell reactivity profile against individual myelin antigens in MS remains unclear.
  • Understanding T-cell responses is crucial for elucidating MS autoimmune mechanisms.

Purpose of the Study:

  • To investigate T-cell reactivity to myelin antigens (MBP, MOG, PLP) in MS patients versus healthy controls.
  • To determine if MS patients show preferential T-cell responses to specific myelin antigens or peptides.
  • To assess the activation status and cytokine profiles of myelin-reactive T-cells in MS.

Main Methods:

  • IFN-gamma ELISPOT assay used to measure T-cell responses to MBP, MOG, and selected peptides.
  • Analysis of T-cell reactivity to specific myelin peptides (MBP, MOG, PLP) in MS patients and controls.
  • Assessment of IL-2 receptor (IL2R) expression on MBP-reactive T-cells and cytokine production (IFN-gamma, IL-4).

Main Results:

  • Both MS patients and healthy controls displayed heterogeneous anti-myelin T-cell reactivity.
  • A positive correlation was observed between anti-MOG and anti-MBP T-cell responses in MS patients.
  • Increased frequency of IL2R+ MBP-reactive T-cells found in MS patients, indicating in vivo activation.
  • MBP-reactive T-cells were predominantly Th1-type, but cytokine secretion was modifiable.
  • No single myelin peptide was preferentially recognized across all tested peptides.

Conclusions:

  • MS patients exhibit a broad, rather than antigen-specific, T-cell response to myelin proteins.
  • MBP-reactive T-cells are activated in vivo in MS patients, predominantly of the Th1 phenotype.
  • ELISPOT assays reveal a significant frequency of myelin-specific T-cells, potentially underestimated by proliferation assays.
  • These findings highlight the complex autoimmune landscape in MS and the role of T-cell responses to myelin antigens.

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