Positional cloning of the Igl genes controlling rheumatoid factor production and allergic bronchitis in rats

Research output: Contribution to journalArticle

Abstract

Rheumatoid factors (RF), autoantibodies that bind the Fc region of IgG, are one of the major diagnostic marker in rheumatoid arthritis (RA) but occur with lower frequency also in other infectious and inflammatory conditions. Through positional cloning of the previously described quantitative trait locus (QTL) Rf1 in congenic and advanced intercrossed rats, we identified the Ig lambda light chain locus as a locus that regulates the production of RF in rats. The congenic rats produce RF-Ig lambda and have significant higher levels of RF-IgG and RF-IgM in serum, while the DA rat has an impaired RF production and does not produces RF-Ig lambda. Thus, we could investigate the role of RF in pristane-induced arthritis (PIA) as well as ovalbumin-induced airway inflammation. We show that there was no difference in the development and severity of PIA between congenic and parental DA rats, suggesting that RIP using lambda light chains have no impact on PIA. However, the RF producing congenic rats developed a more severe airway inflammation as indicated in the significantly increased number of eosinophils in bronchoalveolar lavage fluid as well as total IgE in serum. In addition, RF congenic rats had a significantly enhanced immune response toward OVA due to increased OVA-Igk but not OVA-IgI antibodies, suggesting a possible involvement of RF in the regulation of the humoral immune response.

Details

Authors
  • Carola Rintisch
  • Jacqueline Ameri
  • Peter Olofsson
  • Holger Luthman
  • Rikard Holmdahl
Organisations
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Medical Genetics
  • Cell and Molecular Biology

Keywords

  • rheumatoid, OVA-induced airway inflammation, quantitative trait locus, arthritis, congenic animals
Original languageEnglish
Pages (from-to)14005-14010
JournalProceedings of the National Academy of Sciences
Volume105
Issue number37
Publication statusPublished - 2008
Publication categoryResearch
Peer-reviewedYes

Bibliographic note

The information about affiliations in this record was updated in December 2015. The record was previously connected to the following departments: Stem Cell and Pancreas Developmental Biology (013212044), Medical Genetics Unit (013241550)