Cited by 133Liver Diseases and ImmunitySystemic Lupus Erythematosus ResearchAutoimmune Bullous Skin Diseases

Epitope mapping and reactivity of autoantibodies to the E2 component of 2‐oxoglutarate dehydrogenase complex in primary biliary cirrhosis using recombinant 2‐oxoglutarate dehydrogenase complex

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Moteki, S, Leung, P S, Dickson, E R, Van Thiel, D H, Galperin, C, Buch, T, Alarcon-Segovia, D, Kershenobich, D +4 more·1996·Hepatology

Abstract

Five different target mitochondrial autoantigens recognized by sera from patients with primary biliary cirrhosis (PBC) have been identified as subunits of the following 2-oxo acid dehydrogenase complexes: the pyruvate dehydrogenase complex (PDC), the branched chain 2-oxo acid dehydrogenase complex (BCOADC), and the 2-oxoglutarate dehydrogenase complex (OGDC). Unlike the E2 subunits of PDC (PDC-E2) and BCOADC (BCOADC-E2), the E2 subunits of OGDC (OGDC-E2) reactivity of PBC sera and the reactive epitope of OGDC-D2 have not hitherto been studied in detail. In this report, we took advantage of a recombinant fusion protein for OGDC-E2 to address these issues. Eighty of 268 (29.9%) PBC patient sera but none of the 45 controls reacted with recombinant OGDC-E2. The recombinant OGDC-E2 was judged to express the immunodominant epitope, because when sera from patients with PBC were preabsorbed with the recombinant fusion protein, such sera were depleted of reactivity against 48 kD OGDC-E2 when probed on beef heart mitochondria (BHM) but retained reactivity toward PDC-E2 and/or BCOADC-E2. Furthermore, affinity-purified PBC sera against recombinant OGDC-E2 reacted only with native OGDC-E2 and not with any other enzyme components of the 2-oxo acid dehydrogenase complex. Antimitochondrial autoantibodies (AMA) against OGDC-E2 included immunoglobulin (Ig)G2, IgG3 and IgM and the relative titers were as follows: IgG2 > IgG3 > IgM. Finally, using overlapping recombinant polypeptides, it was determined that a minimum of 81 amino acids (residues 67-147) corresponding to the lipoyl domain of OGDC-E2 are necessary for reactivity, suggesting that a conformational autoepitope is recognized by AMA. These data suggest that each of the 2-oxo acid dehydrogenase enzymes has distinct antigenicity despite their similarities in structure and function. The availability of recombinant OGDC-E2 autoantigen will allow the design of additional studies to further our understanding of the role of mitochondrial autoantigens in the pathogenesis of PBC.

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Crossref · 10.1002/hep.510230307

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  • AMA is a highly disease-specific autoantibody that targets lipoic acid on the 2-oxo-acid dehydrogenase complexes of the inner mitochondrial membrane.

    “AMA is a highly disease-specific autoantibody (8) that targets the lipoic acid present on the 2-oxo-acid dehydrogenase complexes located on the inner mitochondrial membrane.(9)”

    From Primary Biliary Cholangitis: 2018 Practice Guidance from the American Association for the Study of Liver Diseases (2019) · cites this paper as [9]

    Citation (9) is attached to the targeting and location clause, not the disease-specificity clause cited to (8). The Abstract identifies E2 subunits of 2-oxo-acid dehydrogenase complexes as AMA targets, and the epitope-mapping discussion places a recognized epitope in OGDC-E2’s lipoic-acid-binding region. It does not establish that AMA targets lipoic acid itself or that the complexes are located on the inner mitochondrial membrane; the discussion also says lipoic acid’s presence did not affect antibody binding to BCOADC-E2. Page numbers are unavailable in our copy. (LLM, conf=0.86)

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Research works printed but not linked: 9

  1. Yeaman SJ, Fussey SPM, Danner DJ, James OFW, Mutimer 7. Fregeau DR, Davis PA, Danner DJ, Ansari A, Coppel RL, Dick- human PDC-E1a in primary biliary cirrhosis. J Autoimmunity 1991;4:769-778.
  2. Fregeau DR, Roche TE, Davis PA, Coppel R, Gershwin ME. Inhi- bition of pyruvate dehydrogenase complex activity by autoanti- HEPATOLOGY 1990;11:975-981.
  3. Nakano K, Matuda S, Yamanaka T, Tsubouchi H, Nakagawa S, bodies specific for E1a, a non-lipoic acid containing mitochon- drial enzyme. J Immunol 1990;144:1671-1676.
  4. Titani K, Ohta S, et al. Purification and molecular cloning of succinyltransferase of the rat a-ketoglutarate dehydrogenase 9. Surh CD, Roche TE, Danner DJ, Ansari A, Coppel RL, Prindiville T, Dickson ER, et al. Antimitochondrial autoantibodies in pri- complex. J Biol Chem 1991;266:19013-19017.
  5. Gershwin ME, Coppel RL, Bearer E, Peterson MG, Sturgess A, drolipoamide acetyltransferase. J Exp Med 1988;167:1791-1799.
  6. tein structure. J Biol Chem 1988;263:6165-6168.
  7. Surh CD, Danner DJ, Aftab A, Coppel RL, Mackay IR, Dickson plex family. TIBS 1986;11:293-296.
  8. Iwayama T, Leung PSC, Coppel RL, Roche TE, Patel MS, Mizu- ase: cDNA cloning and localization on chromosome 14q24.2- q24.3. Biochim Biophys Acta 1993;1216:360-368.
  9. hepa WBS: Hepatology 15273350, 1996, 3, Downloaded from https://aasldpubs.onlinelibrary.wiley.com/doi/10.1002/hep.510230307, Wiley Online Library on [14/08/2023]. See the Terms and Conditions (https://onlinelibrary.wiley.com/terms-and-conditions) on Wiley Online Library for rules of use; OA articles are governed by the applicable Creative Commons License

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Authors
Moteki, S., Leung, P. S., Dickson, E. R., Van Thiel, D. H., Galperin, C., Buch, T., Alarcon-Segovia, D., Kershenobich, D., Kawano, K., Coppel, R. L., Matuda, S., & Gershwin, M. E.
Affiliations
University of California, Davis (US)
Venue
Hepatology
Published
1996-03
Volume
23
Issue
3
Pages
436-444
ISSN
0270-9139 (ISSN-L)
OpenAlex
W2143495513
Cited by
133
References
36
Citations by year
2025: 1 · 2024: 3 · 2023: 2 · 2022: 3 · 2021: 3 · 2020: 2 · 2019: 5 · 2018: 4 · 2017: 7 · 2016: 4 · 2015: 3 · 2014: 1 · 2013: 6 · 2012: 7
FWCI
5.20
Type
journal article
Language
en
Open access
Locations
  • Hepatology (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • National Institutes of Health (5r29ai031585-05)
  • National Institute of Allergy and Infectious Diseases (AI 31585)
  • National Institute of Diabetes and Digestive and Kidney Diseases (DK39558)
Topics
  • Health Sciences › Medicine › Hepatology › Liver Diseases and Immunity
  • Health Sciences › Medicine › Rheumatology › Systemic Lupus Erythematosus Research
  • Health Sciences › Medicine › Pathology and Forensic Medicine › Autoimmune Bullous Skin Diseases
Keywords
primary biliary cirrhosis, autoantibodies, 2-oxoglutarate dehydrogenase, E2 subunit, epitope mapping, mitochondrial autoantigens, antimitochondrial antibodies, lipoyl domain, conformational epitopes, immunodominant epitopes, pyruvate dehydrogenase complex, recombinant fusion protein, isotype distribution, autoantigen specificity
MeSH terms
Animals, Antigen-Antibody Reactions, Epitopes, Autoantibodies, Autoantigens, Base Sequence, Humans, Ketoglutarate Dehydrogenase Complex, Liver Cirrhosis, Biliary, Mitochondria, Molecular Sequence Data, Recombinant Fusion Proteins, Immunoblotting, Rats

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