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. 1993 Mar 15;90(6):2527–2531. doi: 10.1073/pnas.90.6.2527

Combinatorial autoantibodies to dihydrolipoamide acetyltransferase, the major autoantigen of primary biliary cirrhosis.

S Cha 1, P S Leung 1, M E Gershwin 1, M P Fletcher 1, A A Ansari 1, R L Coppel 1
PMCID: PMC46121  PMID: 8460168

Abstract

mRNA from a regional lymph node of a patient with primary biliary cirrhosis (PBC) was used to construct a combinatorial immunoglobulin library in the lambda phage vector system. Six human monoclonal IgG Fab clones (LC1-LC6) specific for the major autoantigen of PBC--dihydrolipoamide acetyltransferase, the E2 subunit of the pyruvate dehydrogenase complex (PDC-E2)--were isolated, appearing at a frequency of 0.01% in the combinatorial immunoglobulin library. These Fab clones recognize human PDC-E2 with high affinity (Ka = 10(-7)-10(-9) M-1). Using both immunoblotting and ELISA, LC1-LC6 showed little cross-reactivity to any of the other autoantigens commonly recognized by PBC sera or to other antigens commonly recognized by PBC sera or to other antigens such as histone, calf thymus DNA, and bovine serum albumin. The Fab monoclonal antibodies show a typical anti-mitochondrial staining pattern in HEp-2 cells but react strongly with the luminal aspect of biliary epithelial cells of patients with PBC. Our results demonstrate that a recombinant combinatorial immunoglobulin library can be used to isolate high-affinity Fabs against a specific autoantigen. Such reagents will facilitate the analysis of immunoglobulin gene structure, idiotype, and antigen-antibody interactions in autoimmune disease.

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Selected References

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