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Induction of myocarditis in rabbits injected with group A streptococci

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Author

  • LA Burova
  • VA Nagornev
  • PV Pigarevsky
  • MM Gladilina
  • IV Molchanova
  • EA Gavrilova
  • AA Totolian
  • A Thern
  • Claës Schalén

Summary, in English

Background & objectives: We have earlier proposed that group A streptococcal (GAS) immunoglobulin binding surface proteins (IgGBPs) might trigger anti-IgG production and immune complex formation leading to glomerulonephritis. In the present study, cardiac tissue material from rabbits injected with heat-killed GAS was investigated. Methods: Rabbits were injected intravenously with 10(9) colony forming units of streptococci three times weekly for 8 wk. Cardiac tissue samples were obtained at different times and deposition of IgG, C3, TNF-alpha and IL-6 was studied. Results: After 8 or more weeks of intravenous (iv) injections, minimal changes were seen in animals receiving an IgG non-binding GAS strain, type T27, whereas in those animals receiving either of two IgG binding GAS strains, types M1 or M22, strong inflammatory and degenerative myocardial changes accompanied by deposition of IgG and C3 were noted. Furthermore, on injecting rabbits with defined mutants of a type M22 strain, the development of myocardial tissue damage proved to. be dependent on the presence streptococcal IgGBPs. Interpretation & conclusion: The present data supported a role of streptococcal IgGBPs in the induction of myocardial tissue injury by GAS.

Publishing year

2004

Language

English

Pages

183-185

Publication/Series

Indian Journal of Medical Research

Volume

119

Document type

Journal article

Publisher

Council Of Medical Research

Topic

  • Microbiology in the medical area

Keywords

  • Streptococcus
  • IgG binding protein
  • anti-IgG
  • experimental carditis
  • pyogenes

Status

Published

ISBN/ISSN/Other

  • ISSN: 0971-5916