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Related Experiment Videos

Tumor necrosis factor in the heart

D R Meldrum1

  • 1Department of Surgery, University of Colorado Health Sciences Center, Denver 80262, USA.

The American Journal of Physiology
|April 8, 1998
PubMed
Summary

Tumor necrosis factor (TNF) produced in the heart contributes to cardiac dysfunction and cell death. Targeting TNF offers a promising cardioprotective strategy for cardiovascular diseases.

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Area of Science:

  • Cardiovascular Science
  • Immunology
  • Molecular Biology

Background:

  • The heart actively produces tumor necrosis factor (TNF).
  • Both cardiac myocytes and macrophages contribute to myocardial TNF synthesis.
  • Myocardial TNF plays a role in various cardiac conditions, including heart failure and ischemia-reperfusion injury.

Purpose of the Study:

  • To investigate the role of locally produced TNF in myocardial dysfunction.
  • To explore the mechanisms by which TNF affects cardiac function and cardiomyocyte survival.
  • To identify potential therapeutic targets for modulating TNF in cardiovascular disease.

Main Methods:

  • Analysis of TNF production in myocardial tissue.
  • Investigation of signaling pathways (p38 MAP kinase, NF-κB) involved in TNF synthesis.
  • Assessment of TNF-mediated effects on cardiac contractility and apoptosis.
  • Evaluation of nitric oxide (NO)-dependent and NO-independent mechanisms.

Main Results:

  • Locally produced TNF directly impairs myocardial contractility and induces cardiomyocyte apoptosis.
  • Ischemia-reperfusion and lipopolysaccharide activate pathways leading to TNF production.
  • TNF exerts detrimental effects via NO-dependent and sphingosine-dependent pathways.
  • TNF receptor 1 and Fas activation can trigger cardiomyocyte apoptosis.

Conclusions:

  • Myocardial TNF is a significant contributor to cardiac dysfunction and death in various cardiovascular pathologies.
  • Targeting intracellular signaling pathways (MAP kinases, transcription factors) and TNF itself presents feasible cardioprotective strategies.
  • Modulating TNF activity through endogenous ligands or TNF-binding proteins offers a realistic therapeutic approach for cardiovascular diseases.

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