Mitochondrial functionality and metabolism in T cells from progressive multiple sclerosis patients

Area of Science:

• Immunology
• Metabolic pathways
• Neuroimmunology

Background:

• Progressive multiple sclerosis (MS) involves sustained peripheral immune activation, particularly with Th1, T cytotoxic type-1, and Th17 cells.
• T cell function and activation are intrinsically linked to their metabolic state.

Purpose of the Study:

• To investigate mitochondrial functionality and metabolic alterations in T cell subpopulations from patients with progressive MS.
• To compare metabolic profiles between primary progressive (PP) and secondary progressive (SP) MS.

Main Methods:

• Analysis of T cell subpopulations from progressive MS patients.
• Assessment of mitochondrial respiration (Oxygen Consumption Rate, Extracellular Acidification Rate), mitochondrial mass, membrane potential, and gene expression related to metabolism and T cell differentiation.
• Quantification of Glucose transporter-1 levels.

Main Results:

• T cells in progressive MS patients exhibited reduced proliferation and an increase in terminally differentiated/exhausted cells.
• T cells from PP MS patients displayed lower mitochondrial respiration and mass compared to SP MS patients.
• PP MS T cells showed a greater shift towards glycolysis, with higher Glucose transporter-1 expression and glycolytic gene upregulation compared to SP MS.

Conclusions:

• Significant phenotypic and metabolic differences exist between T cells in PP MS and SP MS patients.
• These findings highlight distinct T cell metabolic profiles within the progressive MS spectrum, despite clinical similarities.