title: Overlap of epitopes recognized by anti-carbonic anhydrase I IgG in patients with malignancy-related aplastic anemia-like syndrome and in patients with aplastic anemia.
abstract: High titers of anti-carbonic anhydrase I (anti-CA I) autoantibodies were detected in the sera of patients with malignancies who developed an aplastic anemia-like (AA-like) syndrome after a high-dose therapy (HDT) and autologous stem cell transplantation (ASCT). It was found, that the presence of these anti-CA I autoantibodies is associated with spontaneous tumor regression. The main immunodominant epitopes of carbonic anhydrase isoform I (CA I) have previously been identified using epitope extraction technique in combination with mass spectrometric detection and bioinformatic verification. Similarly, the sera of patients with bona fide aplastic anemia (AA) who poorly responded to immunosuppressive treatment with anti-thymocyte globulin (ATG) demonstrated high titers of anti-CA I antibodies. In order to reveal differences between these antibodies, we applied the same methodology of epitope mapping procedure. Surprisingly, the anti-CA I antibodies from the both groups of patients compatibly recognized the same four candidate CA I epitopes--DGLAV, NVGHS, SLKPI, SSEQL. This finding may indicate common pathophysiological mechanisms in these two syndromes. However, at this moment it remains unresolved if anti-CA I antibodies are implicated in marrow or tumor suppression or are just an epi-phenomenon.
authors.affiliation: Department of Biological and Biochemical Sciences, University of Pardubice, Pardubice, Czech Republic.
authors.forename: Barbora
authors.initials: B
authors.lastname: Jankovicova
authors.forename: Ludovit
authors.initials: L
authors.lastname: Skultety
authors.forename: Maria
authors.initials: M
authors.lastname: Dubrovcakova
authors.forename: Martin
authors.initials: M
authors.lastname: Stern
authors.forename: Zuzana
authors.initials: Z
authors.lastname: Bilkova
authors.forename: Jan
authors.initials: J
authors.lastname: Lakota
mesh_terms: D000741:Anemia, Aplastic / Q000188:drug therapy* / Q000276:immunology; D001323:Autoantibodies / Q000097:blood* / Q000276:immunology; D024401:Carbonic Anhydrase I / Q000276:immunology*; D018604:Epitope Mapping; D000939:Epitopes / Q000276:immunology; D006801:Humans; D007074:Immunoglobulin G / Q000276:immunology*; D009369:Neoplasms / Q000188:drug therapy / Q000276:immunology*; D033581:Stem Cell Transplantation / Q000009:adverse effects
chemical_list: D001323:Autoantibodies; D000939:Epitopes; D007074:Immunoglobulin G; D024401:Carbonic Anhydrase I
keywords: Anti-CA I autoantibodies; Aplastic anemia; Carbonic anhydrase I; Epitope extraction; LC–MS/MS