A comparative study of antibody expressions in primary biliary cirrhosis and autoimmune cholangitis using phage display

Ikuno, N., Scealy, M., Davies, Janet M., Whittingham, S. F., Omagari, K., Mackay, I. R., & Rowley, M. J. (2001) A comparative study of antibody expressions in primary biliary cirrhosis and autoimmune cholangitis using phage display. Hepatology, 34(3), pp. 478-486.

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Abstract

Primary biliary cirrhosis (PBC) and autoimmune cholangitis (AIC) are serologic expressions of an autoimmune liver disease affecting biliary ductular cells. Previously we screened a phage-displayed random peptide library with polyclonal IgG from 2 Australian patients with PBC and derived peptides that identified a single conformational (discontinuous) epitope in the inner lipoyl domain of the E2 subunit of the pyruvate dehydrogenase complex (PDC-E2), the characteristic autoantigen in PBC. Here we have used phage display to investigate the reactivity of PBC sera from 2 ethnically and geographically distinct populations, Japanese and Australian, and the 2 serologic expressions, PBC and AIC. Random 7-mer and 12-mer peptide libraries were biopanned with IgG from 3 Japanese patients with PBC and 3 with AIC who did not have anti-PDC-E2. The phage clones (phagotopes) obtained were tested by capture enzyme-linked immunosorbent assay (ELISA) for reactivity with affinity-purified anti-PDC-E2, and compared with those obtained from Australian patients with PBC. Peptide sequences of the derived phagotopes and sequences derived by biopanning with irrelevant antisera were aligned to develop a guide tree based on physicochemical similarity. Both Australian and Japanese PBC-derived phagotopes were distributed in branches of the guide tree that contained the peptide sequences MH and FV previously identified as part of an immunodominant conformational epitope of PDC-E2, indicating that epitope selection was not influenced by the racial origin of the PBC sera. Biopanning with either PBC or AIC-derived IgG yielded phagotopes that reacted with anti-PDC-E2 by capture ELISA, further establishing that there is a similar autoimmune targeting in PBC and AIC.

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ID Code: 87922
Item Type: Journal Article
Refereed: Yes
Keywords: antibody, epitope, immunoglobulin G, peptide library, protein subunit, pyruvate dehydrogenase complex, pyruvate dehydrogenase complex e2 subunit antibody, unclassified drug, amino acid sequence, article, autoimmune disease, cholangitis, clinical article, controlled study, enzyme conformation, enzyme linked immunosorbent assay, female, human, phage display, primary biliary cirrhosis, priority journal, Adult, Aged, Algorithms, Antibodies, Antigens, Nuclear, Autoantigens, Autoimmune Diseases, Cell Line, Dihydrolipoyllysine-Residue Acetyltransferase, Enzyme-Linked Immunosorbent Assay, Fluorescent Antibody Technique, Humans, Liver Cirrhosis, Biliary, Middle Aged, Nuclear Proteins
DOI: 10.1053/jhep.2001.27013
ISSN: 0270-9139
Copyright Owner: Copyright 2001 John Wiley & Sons, Inc.
Deposited On: 30 Sep 2015 05:36
Last Modified: 30 Sep 2015 05:36

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