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Isolation and Th17 Differentiation of Naïve CD4 T Lymphocytes
Published on: September 26, 2013
Reduced thymic output and peripheral naïve CD4 T-cell alterations in primary progressive multiple sclerosis (PPMS)
David G Haegert1, Jessica D Hackenbroch, Danielle Duszczyszyn
1Department of Pathology, McGill University, 3775 rue University, Montreal, QC, Canada H3A 2B4. david.haegert@muhc.mcgill.ca
Journal of Neuroimmunology
|January 29, 2011
Summary
Primary progressive multiple sclerosis (PPMS) patients exhibit reduced thymic output, impacting T-cell homeostasis. Alterations in naïve T-cells suggest increased survival due to signaling, indicating peripheral immune changes in PPMS.
Area of Science:
- Immunology
- Neuroimmunology
- T-cell Biology
Background:
- Multiple Sclerosis (MS) involves immune dysregulation.
- Understanding T-cell homeostasis is crucial for MS pathogenesis.
- Primary Progressive MS (PPMS) and Relapsing-Remitting MS (RRMS) may have distinct immune profiles.
Purpose of the Study:
- To compare naïve CD4 and CD8 T-cell homeostasis in PPMS, RRMS, and controls.
- To investigate thymic output and T-cell signaling in PPMS.
- To identify peripheral immune alterations in PPMS.
Main Methods:
- Quantitation of signal joint T-cell receptor excision circles (sjTRECs).
- Quantitative estimation of daily thymic export.
- Analysis of CD31+ naïve CD4 T-cells and Bcl-2 expression.
Main Results:
- Reduced thymic output was confirmed in RRMS and demonstrated in PPMS.
- PPMS showed decreasing % CD31+ naïve CD4 T-cells with age.
- Increased Bcl-2 expression in PPMS suggests enhanced naïve T-cell survival.
Conclusions:
- PPMS patients exhibit peripheral immune alterations linked to reduced thymic output.
- T-cell signaling and survival mechanisms are altered in PPMS.
- Findings contribute to understanding MS immunopathogenesis.
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