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Activated suppressor cell dysfunction in progressive multiple sclerosis
Abstract:
Concanavalin A (Con A)-induced suppressor activity has previously been shown to be reduced in multiple sclerosis (MS) patients with active clinical disease. In this study, we demonstrate that OKT3, as well as Con A induced suppressor activity mediated by unfractionated peripheral blood mononuclear cells is reduced in patients with the progressive form of MS. By performing reconstitution experiments involving E+, T4+, or T8+ cells derived from either MS patients or controls, and normal allogeneic macrophages or E- cells, we sought to define the cellular basis for this suppressor defect. In both MS and control groups, E+ cells were required to obtain measurable levels of suppression. Suppressor levels induced by Con A-activated cultures containing E+ cells from MS patients were lower than those induced by those containing control donor E+ cells. Suppression mediated by T8+ cells from MS patients was also lower than for controls. In the control group, suppression mediated by T8+ cells exceeded that mediated by T4+ cells; such differences were not apparent in the MS group. These results suggest that although Con A-induced suppression can be mediated by a number of T and non-T cell subsets, the functional suppressor defect measured in the MS population does involve the T8+ cell subset.
Insights
Suppressor cell activity, crucial for immune regulation, is diminished in multiple sclerosis (MS) patients. This study reveals a specific defect in T8+ suppressor cells contributing to this immune dysfunction in MS.
Area of Science:
- Immunology
- Neuroimmunology
- Cellular Immunology
Background:
- Concanavalin A (Con A)-induced suppressor activity is reduced in active multiple sclerosis (MS).
- Immune dysregulation plays a role in the pathogenesis of MS.
Purpose of the Study:
- To investigate the cellular basis of reduced suppressor activity in progressive MS.
- To identify specific immune cell subsets responsible for suppressor defects in MS patients.
Main Methods:
- Peripheral blood mononuclear cells (PBMCs) from MS patients and controls were analyzed for suppressor activity.
- Reconstitution experiments using T cell subsets (E+, T4+, T8+) and macrophages were performed.
- Suppression levels were measured using Concanavalin A (Con A) and OKT3 induction.
Main Results:
- Reduced Con A-induced suppressor activity was observed in progressive MS patients.
- E+ cells were essential for measurable suppressor activity in both MS and control groups.
- T8+ cells from MS patients showed lower suppressor function compared to controls, with differences not seen in T4+ cells.
Conclusions:
- The functional suppressor defect in MS involves the T8+ cell subset.
- While multiple T and non-T cell subsets can mediate suppression, T8+ cells are significantly impaired in MS.
- These findings highlight a specific cellular deficit in immune regulation in multiple sclerosis.