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Research Article Free access | 10.1172/JCI4213

Identification and precursor frequency analysis of a common T cell epitope motif in mitochondrial autoantigens in primary biliary cirrhosis.

S Shimoda, J Van de Water, A Ansari, M Nakamura, H Ishibashi, R L Coppel, J Lake, E B Keeffe, T E Roche, and M E Gershwin

Division of Rheumatology, Allergy and Clinical Immunology, School of Medicine, University of California, Davis, California 95616, USA.

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Division of Rheumatology, Allergy and Clinical Immunology, School of Medicine, University of California, Davis, California 95616, USA.

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Division of Rheumatology, Allergy and Clinical Immunology, School of Medicine, University of California, Davis, California 95616, USA.

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Division of Rheumatology, Allergy and Clinical Immunology, School of Medicine, University of California, Davis, California 95616, USA.

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Division of Rheumatology, Allergy and Clinical Immunology, School of Medicine, University of California, Davis, California 95616, USA.

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Division of Rheumatology, Allergy and Clinical Immunology, School of Medicine, University of California, Davis, California 95616, USA.

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Division of Rheumatology, Allergy and Clinical Immunology, School of Medicine, University of California, Davis, California 95616, USA.

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Division of Rheumatology, Allergy and Clinical Immunology, School of Medicine, University of California, Davis, California 95616, USA.

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Division of Rheumatology, Allergy and Clinical Immunology, School of Medicine, University of California, Davis, California 95616, USA.

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Division of Rheumatology, Allergy and Clinical Immunology, School of Medicine, University of California, Davis, California 95616, USA.

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Published November 15, 1998 - More info

Published in Volume 102, Issue 10 on November 15, 1998
J Clin Invest. 1998;102(10):1831–1840. https://doi.org/10.1172/JCI4213.
© 1998 The American Society for Clinical Investigation
Published November 15, 1998 - Version history
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Abstract

The immunodominant antimitochondrial antibody response in patients with primary biliary cirrhosis (PBC) is directed against the E2 component of the pyruvate dehydrogenase complex (PDC-E2). Based on our earlier observations regarding peripheral blood mononuclear cell (PBMC) T cell epitopes, we reasoned that a comparative analysis of the precursor frequencies of PDC-E2 163-176-specific T cells isolated from PBMC, regional hepatic lymph nodes, and from the liver of PBC patients would provide insight regarding the role of T cells in PBC. Results showed a disease-specific 100-150-fold increase in the precursor frequency of PDC-E2 163-176-specific T cells in the hilar lymph nodes and liver when compared with PBMC from PBC patients. Interestingly, autoreactive T cells and autoantibodies from PBC patients both recognize the same dominant epitope. In addition, we demonstrated cross-reactivity of PDC-E2 peptide 163-176-specific T cell clones with PDC-E2 peptide 36-49 and OGDC-E2 peptide 100-113 thereby identifying a common T cell epitope "motif" ExETDK. The peptide 163-176-specific T cell clones also reacted with purified native PDC-E2, suggesting that this epitope is not a cryptic determinant. These data provide evidence for a major role for PDC-E2 peptide 163-176 and/or peptides bearing a similar motif in the pathogenesis of PBC.

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