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Molecular mimicry in T cell-mediated autoimmunity: Viral peptides activate human T cell clones specific for myelin basic protein

Identifieur interne : 001A30 ( Main/Exploration ); précédent : 001A29; suivant : 001A31

Molecular mimicry in T cell-mediated autoimmunity: Viral peptides activate human T cell clones specific for myelin basic protein

Auteurs : Kai W. Wucherpfennig [États-Unis] ; Jack L. Strominger [États-Unis]

Source :

RBID : ISTEX:B1572F523C527B4C00D93E43B7B100F47D61DEA0

English descriptors

Abstract

Abstract: Structural similarity between viral T cell epitopes and self-peptides could lead to the induction of an autoaggressive T cell response. Based on the structural requirements for both MHC class 11 binding and TCR recognition of an immunodominant myelin basic protein (MBP) peptide, criteria for a data base search were developed in which the degeneracy of amino acid side chains required for MHC class 11 binding and the conservation of those required for T cell activation were considered. A panel of 129 peptides that matched the molecular mimicry motif was tested on seven MBP-specific T cell clones from multiple sclerosis patients. Seven viral and one bacterial peptide efficiently activated three of these clones. Only one peptide could have been identified as a molecular mimic by sequence alignment. The observation that a single T cell receptor can recognize quite distinct but structurally related peptides from multiple pathogens has important implications for understanding the pathogenesis of autoimmunity.

Url:
DOI: 10.1016/0092-8674(95)90348-8


Affiliations:


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<term>Adenovirus</term>
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<term>Allogeneic feeder cells</term>
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<term>Amino acids</term>
<term>Antigenic</term>
<term>Aromatic residues</term>
<term>Aspartic acid</term>
<term>Autoimmunity</term>
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<term>Cell stimulation</term>
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<term>Clonal expansion</term>
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<term>Contact residues</term>
<term>Cytomegalovirus</term>
<term>Drb1</term>
<term>Epitope</term>
<term>Hemagglutinin</term>
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<term>Herpes simplex</term>
<term>Immunodominant</term>
<term>Immunodominant myelin</term>
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<term>Immunol</term>
<term>Influenza</term>
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<term>Mimicry peptide</term>
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<term>Multiple sclerosis</term>
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<div type="abstract" xml:lang="en">Abstract: Structural similarity between viral T cell epitopes and self-peptides could lead to the induction of an autoaggressive T cell response. Based on the structural requirements for both MHC class 11 binding and TCR recognition of an immunodominant myelin basic protein (MBP) peptide, criteria for a data base search were developed in which the degeneracy of amino acid side chains required for MHC class 11 binding and the conservation of those required for T cell activation were considered. A panel of 129 peptides that matched the molecular mimicry motif was tested on seven MBP-specific T cell clones from multiple sclerosis patients. Seven viral and one bacterial peptide efficiently activated three of these clones. Only one peptide could have been identified as a molecular mimic by sequence alignment. The observation that a single T cell receptor can recognize quite distinct but structurally related peptides from multiple pathogens has important implications for understanding the pathogenesis of autoimmunity.</div>
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