T cell subsets in multiple sclerosis. A longitudinal study of exacerbating-remitting cases

Area of Science:

• Immunology
• Neurology
• Clinical Medicine

Background:

• Multiple Sclerosis (MS) is a chronic autoimmune disease affecting the central nervous system.
• T-cell subset distribution is implicated in the immunopathogenesis of MS.
• Understanding T-cell dynamics during disease relapses is crucial for therapeutic strategies.

Purpose of the Study:

• To investigate longitudinal changes in T-cell subsets (OKT3, OKT4, OKT8) in untreated MS patients.
• To correlate T-cell subset distribution with the onset and course of relapses in relapsing-remitting MS.
• To assess the diagnostic potential of the OKT4/OKT8 ratio as a biomarker for MS activity.

Main Methods:

• Longitudinal study of 24 untreated MS patients with exacerbating-remitting disease.
• Flow cytometry using monoclonal antibodies OKT3, OKT4, and OKT8 to analyze peripheral blood T-cell subsets.
• Comparison of T-cell subset ratios between relapse and remission phases, and with healthy controls.

Main Results:

• A decreased percentage of OKT8 reactive cells and an increased OKT4/OKT8 ratio were observed in relapsing MS patients.
• These T-cell subset abnormalities often occurred within two weeks before and one week after relapse onset.
• 78% of MS patients showed an increased OKT4/OKT8 ratio during relapse compared to remission, though only 50% exceeded healthy control limits.

Conclusions:

• The OKT4/OKT8 ratio serves as a potential indicator of active relapse in multiple sclerosis.
• T-cell subset imbalances, particularly the OKT4/OKT8 ratio, are more pronounced in patients experiencing frequent relapses.
• While not universally exceeding control ranges, individual fluctuations in T-cell subsets during remission warrant further investigation.