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An Ex vivo Model of an Oligodendrocyte-directed T-Cell Attack in Acute Brain Slices
Published on: February 5, 2015
CD4+CD25+CD127dimFoxp3+ T cells are cytotoxic for human neurons.
Yohannes Haile1, Dion Pasychniyk, Diane Turner
1Division of Neurology/Department of Medicine, University of Alberta, Edmonton, Alberta, T6G 2G3, Canada.
Journal of Leukocyte Biology
|March 16, 2011
Summary
Human CD4(+)CD25(+)Foxp3(+) T cells can be neurotoxic, unlike their mouse counterparts. Further research is needed before using these T regulatory cells therapeutically for multiple sclerosis (MS).
Area of Science:
- Immunology
- Neuroscience
- Cell Biology
Background:
- Multiple sclerosis (MS) involves myelin destruction and neuronal loss.
- Regulatory T cells (Tregs) show promise in MS mouse models.
- Human CD4(+)CD25(+)Foxp3(+) T cells may have diverse subpopulations with varying functions.
Purpose of the Study:
- To investigate the function of human activated CD4(+)CD25(+)Foxp3(+) T cells.
- To determine if human regulatory T cell phenotypes differ from mouse phenotypes.
- To assess the potential neurotoxicity of human CD4(+)CD25(+)Foxp3(+) T cells.
Main Methods:
- In vitro analysis of human activated CD4(+)CD25(+)Foxp3(+) T cells.
- Assessment of cytotoxic molecule (GrB) expression.
- Measurement of cytokine production (IFN-γ, IL-17).
- Evaluation of suppressive effects.
Main Results:
- Human activated CD4(+)CD25(+)Foxp3(+) T cells demonstrated in vitro neurotoxicity.
- These cells expressed high levels of Granzyme B (GrB).
- No suppressive effect was observed; instead, IFN-γ and low IL-17 production indicated a T(H)1 shift.
Conclusions:
- A subpopulation of human CD4(+)CD25(+)Foxp3(+) T cells is cytotoxic and non-regulatory.
- Potential differences exist between human and mouse regulatory T cell phenotypes.
- Further investigation of human regulatory T cell phenotypes is crucial for therapeutic applications in MS.
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