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Related Experiment Videos

Cardiodepression by tumor necrosis factor-alpha

U Müller-Werdan1, H Engelmann, K Werdan

  • 1Department of Medicine III, Martin-Luther University Halle-Wittenberg, Ernst-Grube-Strasse 40, D-06097 Halle, Germany. Tel: (+49) 345 557 4545, Fax: (+49) 345 557 4546,

European Cytokine Network
|January 16, 1999
PubMed
Summary

Tumor necrosis factor-alpha (TNF-alpha) causes heart dysfunction, mimicking sepsis. Its role in chronic heart failure is unclear, with complex effects on cardiomyocytes.

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Area of Science:

  • Cardiology
  • Immunology
  • Biochemistry

Background:

  • Tumor necrosis factor-alpha (TNF-alpha) exhibits cardiodepressant effects, relevant to sepsis and heart disorders.
  • Elevated TNF-alpha levels are observed in sepsis and various non-septic heart conditions.
  • The precise role of TNF-alpha in chronic heart failure pathogenesis remains undetermined.

Purpose of the Study:

  • To investigate the complex cardiodepressant effects of TNF-alpha.
  • To explore the mechanisms underlying TNF-alpha-induced cardiac dysfunction.
  • To differentiate between acute and chronic effects of TNF-alpha on the heart.

Main Methods:

  • In vivo and in vitro experimental models.
  • Analysis of cardiovascular responses to TNF-alpha administration.

Related Experiment Videos

  • Investigation of molecular pathways, including inducible nitric oxide synthase (iNOS) and mitochondrial function.

    • Main Results:

    • TNF-alpha administration in vivo replicates septic cardiomyopathy.
    • In vitro studies reveal concentration-dependent effects: NO-independent cardiodepression at low concentrations and iNOS induction at higher concentrations.
    • Chronic TNF-alpha exposure impairs mitochondrial function and phosphoinositide precursor synthesis.

    Conclusions:

    • TNF-alpha has multifaceted effects on cardiomyocyte performance, varying with concentration and duration.
    • Mechanisms include NO-dependent and NO-independent pathways, sphingosine release, and mitochondrial dysfunction.
    • Further research is needed to elucidate the involvement of secondary cytokines and apoptotic signals in TNF-alpha-mediated cardiodepression.