title: Detection of antibodies against synthetic peptides mimicking ureases fragments in sera of rheumatoid arthritis patients.
abstract: Rheumatoid arthritis (RA) is a chronic disease with an autoimmunological background. RA is mostly characterized by systemic inflammation and injuries of synovial joints. There is a hypothesis that bacterial infections may be connected with development of the disease. It has been suggested that molecular mimicry between bacterial and human antigens may be one of possible mechanisms of RA development. One of potential antigens involved in this mechanism is urease - enzyme with high structural conservatism, occurring in pathogenic and commensal bacteria. We found that the level of antibodies against peptide mimicking urease "flap" region is significantly higher in sera from patients with rheumatoid arthritis in comparison with volunteer blood donor sera. We also observed that antibodies present in RA sera may bind not only specific peptide antigens but also peptides with a slightly different structure.
authors.affiliation: Department of Microbiology, Institute of Biology, Jan Kochanowski University, Kielce, Poland. iwona.konieczna@ujk.edu.pl
authors.forename: Iwona
authors.initials: I
authors.lastname: Konieczna
authors.forename: Marek
authors.initials: M
authors.lastname: Kwinkowski
authors.forename: Beata
authors.initials: B
authors.lastname: Kolesińska
authors.forename: Zbigniew
authors.initials: Z
authors.lastname: Kamiński
authors.forename: Paulina
authors.initials: P
authors.lastname: Zarnowiec
authors.forename: Wiesław
authors.initials: W
authors.lastname: Kaca
mesh_terms: D000042:Absorption; D000595:Amino Acid Sequence; D000907:Antibodies, Bacterial / Q000097:blood* / Q000276:immunology; D000918:Antibody Specificity; D001172:Arthritis, Rheumatoid / Q000097:blood* / Q000276:immunology* / Q000382:microbiology; D001426:Bacterial Proteins / Q000737:chemistry / Q000276:immunology*; D005260:Female; D016481:Helicobacter Infections / Q000097:blood / Q000276:immunology; D016480:Helicobacter pylori / Q000302:isolation & purification; D006801:Humans; D008297:Male; D008875:Middle Aged; D018716:Molecular Mimicry; D008969:Molecular Sequence Data; D010455:Peptides / Q000737:chemistry / Q000276:immunology*; D014510:Urease / Q000737:chemistry / Q000276:immunology*
chemical_list: D000907:Antibodies, Bacterial; D001426:Bacterial Proteins; D010455:Peptides; D014510:Urease