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Differential responses of CD45+ve T-cell subsets to MBP in multiple sclerosis
1Department of Pathology and Microbiology, School of Medical Sciences, University of Bristol, Bristol, UK. M.Ponsford@bristol.ac.uk
Abstract:
The proliferative response of preparations of whole PBMC populations from 20 healthy individuals and 28 multiple sclerosis (MS) patients to purified protein derivative (PPD) and myelin basic protein (MBP) was monitored in a kinetic assay over a period of up to 10 days. PPD produced a classical secondary response in both groups, the magnitude being significantly reduced in the MS cohort. The magnitude and pattern of response to MBP did not differ between the two populations. The kinetic profile characteristic of a primary response was observed in both groups. Enrichment of the CD45RO+ve and CD45RA+ve T-cell subsets in PBMC led to a secondary response to PPD in the RO+ve and primary response in the RA+ve population in both groups. The response to MBP in both RO+ve and RA+ve populations exhibited primary kinetics in both MS patients and healthy individuals. However, the use of T-cell subset enriched populations allowed a finer dissection of the response to MBP which highlighted the more active role of RO-positive cells in MS patients. The most striking difference between patients and healthy individuals occurred on day 4 of culture when a greater response to MBP occurred in the CD45RO enriched population, paralleling the response to PPD, in the majority of patients. Futhermore in 4/8 patients and only 1/8 healthy individuals the response in the RO+ve cultures was maintained at a higher level than that seen in the corresponding RA+ve cultures throughout the culture period. This data indicates that a measurable memory response to MBP exists in MS patients implying prior activation of MBP reactive T lymphocytes during the course of disease.
Insights
Multiple sclerosis (MS) patients show a reduced response to purified protein derivative (PPD) but a distinct memory response to myelin basic protein (MBP), particularly in CD45RO+ T-cells, indicating prior T-cell activation in MS.
Area of Science:
- Immunology
- Neuroimmunology
- T-cell immunology
Background:
- Multiple sclerosis (MS) is a chronic inflammatory disease of the central nervous system.
- The role of T-cell responses to myelin antigens in MS pathogenesis is crucial but not fully understood.
- Understanding T-cell kinetics and memory responses is key to developing targeted therapies.
Purpose of the Study:
- To compare the proliferative responses of T-cells from MS patients and healthy individuals to purified protein derivative (PPD) and myelin basic protein (MBP).
- To investigate the kinetic profiles and subset-specific responses (CD45RO+ and CD45RA+ T-cells) to these antigens.
- To determine if a measurable memory response to MBP exists in MS patients.
Main Methods:
- Peripheral blood mononuclear cells (PBMCs) from 20 healthy individuals and 28 MS patients were cultured.
- Proliferative responses to PPD and MBP were monitored over 10 days using kinetic assays.
- T-cell subsets (CD45RO+ and CD45RA+) were enriched to analyze subset-specific responses.
Main Results:
- MS patients showed a significantly reduced secondary response to PPD compared to controls.
- Responses to MBP did not differ in magnitude or pattern between MS patients and controls in whole PBMC populations.
- Enriched CD45RO+ T-cells from MS patients exhibited a heightened response to MBP on day 4, suggesting a more active role and memory response in MS.
Conclusions:
- A measurable memory response to MBP exists in MS patients, implying prior in vivo activation of MBP-reactive T lymphocytes.
- The CD45RO+ T-cell subset plays a more active role in the MBP response in MS patients.
- These findings contribute to understanding T-cell dynamics in MS and suggest potential therapeutic targets.
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