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Trypanosoma cruzi infection and nuclear factor kappa B activation prevent apoptosis in cardiac cells

Christine A Petersen1, Katherine A Krumholz, John Carmen

  • 1Department of Immunology and Infectious Diseases, Harvard School of Public Health, Boston, MA 02115, USA. kalicat@iastate.edu

Infection and Immunity
|February 24, 2006
PubMed

Insights

Trypanosoma cruzi infection protects heart cells from apoptosis by activating NF-kappaB, a key factor in persistent infection and reduced cardiac damage. This parasite manipulation of cell death pathways is crucial for Chagas disease progression.

Area of Science:

  • Cardiovascular Science
  • Infectious Diseases
  • Cell Biology

Background:

  • Cardiomyocyte apoptosis is a critical factor in heart failure and cardiac pathology.
  • Trypanosoma cruzi infection causes heart disease and affects host apoptotic pathways differently across cell types.
  • While T. cruzi protects neurons and cardiomyocytes from apoptosis, it triggers apoptosis in T cells.

Purpose of the Study:

  • To investigate the mechanism by which T. cruzi protects cardiomyocytes from apoptosis.
  • To determine the role of NF-kappaB and caspase 3 in T. cruzi-mediated apoptosis resistance in cardiac cells.

Main Methods:

  • In vitro culture of cardiomyocytes infected with T. cruzi.
  • Induction of apoptosis using tumor necrosis factor alpha and serum reduction.
  • Analysis of NF-kappaB activation and caspase 3 activity.

Main Results:

  • T. cruzi infection protected cardiomyocytes from apoptosis, correlating with intracellular parasite presence.
  • Protection involved the activation of host cell NF-kappaB.
  • Apoptotic block by T. cruzi diminished caspase 3 activation.

Conclusions:

  • T. cruzi's ability to prevent cardiomyocyte apoptosis is vital for establishing persistent heart infection.
  • This mechanism may minimize cardiac damage and remodeling associated with cardiomyocyte apoptosis in cardiovascular disease.
  • Understanding this interaction is key for managing Chagas disease cardiomyopathy.

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