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Interferon-gamma secretion by peripheral blood T-cell subsets in multiple sclerosis: correlation with disease phase
B Becher1, P S Giacomini, D Pelletier
1Neuroimmunology Unit, Montreal Neurological Institute, McGill University, Quebec, Canada.
Insights
Interferon-gamma (IFN-gamma) levels differ in multiple sclerosis (MS) T-cells. IFN-gamma is elevated in secondary progressive MS but reduced in relapsing-remitting MS, with significant reduction seen in patients treated with interferon-beta (IFN-beta).
Area of Science:
- Immunology
- Neuroscience
- Cell Biology
Background:
- Interferon-gamma (IFN-gamma) plays a role in immune regulation and pathogenesis of multiple sclerosis (MS).
- Understanding T-cell subset involvement in MS is crucial for developing targeted therapies.
Purpose of the Study:
- To investigate the proportion of IFN-gamma secreting CD4 and CD8 T-cells in different MS patient groups.
- To assess the impact of interferon-beta (IFN-beta) treatment on these T-cell populations.
Main Methods:
- Intracellular cytokine staining technique.
- Analysis of peripheral blood T-cell subsets (CD4 and CD8) from MS patients and controls.
Main Results:
- Increased IFN-gamma expression in CD4 and CD8 T-cells of secondary progressive (SP) MS patients compared to controls.
- Reduced IFN-gamma expression in untreated relapsing-remitting (RR) MS patients.
- Significant reduction in IFN-gamma secreting cells in patients treated with IFN-beta.
Conclusions:
- IFN-gamma secretion by CD8 T-cells and functional suppressor defects in MS may be dissociable.
- IFN-beta therapy significantly reduces IFN-gamma-expressing CD8 cells, suggesting a therapeutic mechanism.
- Distinct patterns of IFN-gamma expression in T-cells correlate with MS disease progression and treatment status.
Abstract:
Interferon-gamma (IFN-gamma) is implicated as a participant in the immune effector and regulatory mechanisms considered to mediate the pathogenesis of multiple sclerosis (MS). We have used an intracellular cytokine staining technique to demonstrate that the proportion of ex vivo peripheral blood CD4 and CD8 T-cell subsets expressing IFN-gamma is increased in secondary progressing (SP) MS patients, whereas the values in untreated relapsing-remitting (RR) MS patients are reduced compared with those of controls. Patients treated with interferon-beta (IFN-beta) have an even more significant reduction in the percentage of IFN-gamma-secreting cells. The finding that the number of IFN-gamma-expressing CD8 cells is increased in SPMS patients, a group with reduced functional suppressor activity, and is most significantly reduced by IFN-beta therapy, which increases suppressor activity, indicates that IFN-gamma secretion by CD8 T cells and functional suppressor defects attributed to this cell subset in MS can be dissociated.
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