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Related Experiment Videos

Rapamycin ameliorates experimental autoimmune myocarditis.

Kayo Maeda1, Tetsuo Shioi, Rie Kosugi

  • 1Department of Internal Medicine and Cardiology, Kitasato University School of Medicine, Sagamihara, Japan.

International Heart Journal
|July 27, 2005
PubMed
Summary

Rapamycin treatment suppressed mammalian target of rapamycin (mTOR) signaling, reducing inflammation and improving cardiac function in rats with autoimmune myocarditis. This study highlights mTOR

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Area of Science:

  • Immunology
  • Cardiology
  • Pharmacology

Background:

  • Autoimmune myocarditis in rats serves as a model for human dilated cardiomyopathy.
  • Mammalian target of rapamycin (mTOR) is a key regulator of cellular processes, and its role in autoimmune myocarditis is under investigation.

Purpose of the Study:

  • To investigate the role of mTOR in autoimmune myocarditis.
  • To evaluate the therapeutic potential of rapamycin, an mTOR inhibitor, in this myocarditis model.

Main Methods:

  • Administered rapamycin to rats immunized with cardiac myosin.
  • Assessed phosphorylation of p70 ribosomal S6 kinase 1 (S6K1) and S6.
  • Quantified mRNA levels of key cytokines (interleukin-1beta, interferon-gamma, interleukin-2, tumor necrosis factor-alpha).

Related Experiment Videos

  • Measured plasma brain natriuretic peptide levels and cardiac function indicators.
  • Evaluated heart weight/tibial length ratio, myocardial cellular infiltration, and fibrosis.

    • Main Results:

    • Rapamycin completely suppressed S6K1 and S6 phosphorylation, indicating mTOR pathway inhibition.
    • Myosin immunization markedly increased cardiac cytokine mRNA levels, which were significantly attenuated by rapamycin.
    • Rapamycin improved rat survival, preserved cardiac function, and reduced cardiac hypertrophy.
    • Plasma brain natriuretic peptide levels were attenuated by rapamycin.
    • Rapamycin decreased myocardial cellular infiltration and fibrosis, with reduced phosphorylated S6 in infiltrating cells.

    Conclusions:

    • Rapamycin effectively inhibits mTOR signaling in autoimmune myocarditis.
    • Rapamycin ameliorates myocardial injury, reduces inflammation, and preserves cardiac function in this rat model.
    • These findings suggest that targeting mTOR with rapamycin holds therapeutic promise for autoimmune myocarditis and related cardiomyopathies.