CD127 immunophenotyping suggests altered CD4+ T cell regulation in primary progressive multiple sclerosis

Area of Science:

• Immunology
• Neuroimmunology

Background:

• Aberrant regulatory T cell (Treg) populations are implicated in autoimmune diseases.
• CD127 is a specific marker for the CD4(+)CD25(Hi) Treg subset and is associated with multiple sclerosis (MS).

Purpose of the Study:

• To investigate the role of CD127 expression and Treg function in different forms of MS.
• To explore the immunophenotype of regulatory T cells in primary progressive MS (PPMS).

Main Methods:

• Flow cytometry analysis of T cell subsets (Tregs, CD8(+)CD28(-), NKT cells) and CD127/FoxP3 expression.
• Correlation analysis of T cell markers with MS subtypes and clinical presentation.

Main Results:

• Regulatory T cell subsets (Tregs, CD8(+)CD28(-), NKT) exhibit low CD127 levels, potentially impacting survival when IL7 is limited.
• In PPMS, proportions of CD4(+)FoxP3(+)CD25(Hi) Tregs were not aberrant, but FoxP3 expression per cell trended lower, correlating with suppressor function.
• The target of Tregs, CD4(+)CD25(-) cells, were in excess in PPMS.
• A protective CD127 haplotype correlated with higher CD127 expression in PPMS.

Conclusions:

• Low CD127 expression on certain T cell subsets may contribute to immune dysregulation in MS.
• Altered Treg function and target cell populations are observed in PPMS, warranting further investigation.
• The CD127 immunophenotype may represent a therapeutic target in MS.