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Tolerance induction by acylated peptides: effect on encephalitogenic T cell lines.
J St Louis1, X M Zhang, E Heber-Katz
1The John P. Robarts Research Institute, University of Western Ontario, Health Sciences Center, London, Ontario, N6A 5C1, Canada.
Journal of Autoimmunity
|May 1, 1999
Summary
Acylating myelin basic protein peptide (PAL68-86) creates a potent tolerogen for experimental autoimmune encephalomyelitis (EAE). This acylated peptide induces functional inactivation in T cells, offering a basis for autoimmune disease treatment.
Area of Science:
- Immunology
- Neuroscience
- Autoimmune Diseases
Background:
- Experimental autoimmune encephalomyelitis (EAE) is a model for multiple sclerosis.
- Myelin basic protein (MBP) is a key autoantigen in EAE.
- Acylation of MBP68-86 with palmitoyl chloride (PAL68-86) previously showed tolerogenic properties.
Purpose of the Study:
- To investigate the mechanism by which PAL68-86 induces tolerance.
- To characterize the T cell response to acylated versus unmodified MBP peptides.
Main Methods:
- T cell lines derived from Lewis rats protected with PAL68-86 were analyzed.
- Proliferation assays and in vitro propagation of T cells with MBP68-86 or PAL68-86 were performed.
- EAE transfer experiments and Vbeta8.2 staining were conducted.
Main Results:
- T cell lines from PAL68-86-protected rats showed poor proliferation to MBP68-86.
- T cells propagated with PAL68-86 became unresponsive to MBP68-86.
- PAL68-86-modulated T cells had reduced capacity to transfer EAE.
- Vbeta8.2 expression remained high regardless of peptide modification.
Conclusions:
- Tolerance induced by PAL68-86 likely operates through functional T cell inactivation.
- Acylated peptides demonstrate potential for antigen-specific immunotherapy in autoimmune diseases.