Low and high CD8 positive T cells in multiple sclerosis patients

Area of Science:

• Immunology
• Neuroimmunology
• T cell subsets

Background:

• CD8+ T cells are implicated in multiple sclerosis (MS) pathogenesis.
• Peripheral blood T cells can be categorized into CD8+high and CD8+low subsets.
• CD8+low T cells exhibit an activated effector phenotype, while CD8+high T cells possess regulatory functions.

Purpose of the Study:

• To compare the frequencies of CD8+high and CD8+low T cell subsets in multiple sclerosis patients and healthy controls.
• To investigate the potential role of these T cell subsets in the different forms of MS.

Main Methods:

• Flow cytometry was employed to analyze T cell subsets.
• Frequencies of CD8+high and CD8+low T cells were quantified in MS patients (n=31) and controls (n=18).

Main Results:

• A significant increase in CD8+ T cells and CD8+low T cells was observed in patients with secondary progressive multiple sclerosis (SPMS) and primary progressive multiple sclerosis (PPMS) compared to controls.
• Elevated levels of CD8+ T cells and CD8+low T cells were also noted in patients with relapsing-remitting multiple sclerosis (RRMS).

Conclusions:

• The study highlights a significant increase in CD8+ T cells and particularly CD8+low T cells in patients with progressive forms of multiple sclerosis.
• These findings underscore the involvement of CD8+low T cells in the pathogenesis of progressive multiple sclerosis.