Immunoglobulin isotype determines pathogenicity in antibody-mediated myocarditis in naive mice

Anita P. Kuan, Lionel Zuckier, Li Liao, Stephen M. Factor, Betty Diamond

Research output: Contribution to journalArticlepeer-review

47 Scopus citations


Antimyosin reactivity is associated with cardiac damage in autoimmune myocarditis, an inflammatory heart disease characterized by a cellular infiltrate in the myocardium and myocyte necrosis. We are interested in the pathogenicity of antimyosin antibodies and their ability to cause autoimmune myocarditis. We have shown that antimyosin antibodies of the IgG isotype will induce disease in the DBA/2 mouse. In the present study, we show that IgM antimyosin antibodies do not induce myocarditis; however, these same antibodies become pathogenic when converted to the IgG isotype. Although IgM antibodies can penetrate the myocardium during cardiac inflammation, they are usually less able to leave the vascular compartment and penetrate cardiac tissue, thus accounting for their lack of pathogenicity. Thus, antimyosin B cells may be potentially pathogenic only after antigen activation and heavy chain class switching or under conditions that alter vascular permeability in the heart.

Original languageEnglish (US)
Pages (from-to)281-285
Number of pages5
JournalCirculation research
Issue number3
StatePublished - Feb 18 2000


  • Immunoglobulin isotype
  • Myocarditis
  • Pathogenicity

ASJC Scopus subject areas

  • Physiology
  • Cardiology and Cardiovascular Medicine


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