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Blood-brain barrier breakdown in MBP-specific T cell induced experimental allergic encephalomyelitis. A quantitative
I J Namer1, J Steibel, P Poulet
1Institut de Physique Biologique, Faculté de Médecine, Strasbourg, France.
Abstract:
Blood--brain barrier permeability in myelin basic protein (MBP)-specific T cell induced experimental allergic encephalomyelitis (EAE) was studied by magnetic resonance imaging (MRI) in Lewis rats. Myelin basic protein-specific T cells of different specificity and/or purified protein derivative (PPD)-specific T cells were used. During the course of EAE, the volume of the lesions and the T1 and T2 relaxation times were recorded and evaluated with respect to the clinical signs. The results showed that the severity of abnormalities seen on MRI, corresponding to the blood--brain barrier breakdown and cerebral oedema depended on the following two factors: (i) the specificity of the MBP-specific T cells used; (ii) the number of MBP-specific T cells transferred. It was also shown that the more specific the cells were, the less severe the cerebral blood--brain barrier rupture. Moreover, the blood--brain barrier breakdown increased when the number of cells increased. Our results demonstrated that a synergy exists between MBP and PPD-specific T cells which seems to result in an increase in central nervous system inflammation. This helps to explain the role of Mycobacterium tuberculosis in the induction of EAE.
Insights
Investigating experimental allergic encephalomyelitis (EAE) in rats revealed that blood-brain barrier permeability depends on T cell specificity and number. More specific T cells and fewer cells reduced blood-brain barrier rupture, indicating key factors in central nervous system inflammation.
Area of Science:
- Neuroimmunology
- Experimental Neurology
- Immunology
Background:
- Experimental allergic encephalomyelitis (EAE) is an animal model for multiple sclerosis.
- The blood-brain barrier (BBB) plays a critical role in central nervous system (CNS) inflammation.
- Understanding BBB permeability is crucial for developing therapeutic strategies.
Purpose of the Study:
- To investigate the relationship between T cell characteristics and BBB permeability in EAE.
- To evaluate the impact of T cell specificity and cell number on BBB breakdown and CNS inflammation.
- To explore the synergistic effects of different T cell populations on EAE severity.
Main Methods:
- Induction of EAE in Lewis rats using myelin basic protein (MBP)-specific T cells.
- Magnetic resonance imaging (MRI) was employed to assess BBB permeability, lesion volume, and T1/T2 relaxation times.
- Evaluation of T cells with varying specificities, including purified protein derivative (PPD)-specific T cells.
Main Results:
- BBB breakdown and cerebral edema severity correlated with T cell specificity and the number of MBP-specific T cells transferred.
- Increased T cell specificity led to reduced BBB rupture.
- Higher numbers of transferred T cells resulted in increased BBB breakdown.
- A synergistic effect between MBP and PPD-specific T cells was observed, enhancing CNS inflammation.
Conclusions:
- T cell specificity and cell dose are critical determinants of BBB permeability in EAE.
- The findings suggest a mechanism for Mycobacterium tuberculosis's role in EAE induction.
- Targeting T cell characteristics could be a therapeutic approach for CNS inflammatory diseases.