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Related Experiment Videos

Endotoxin hypersensitivity in chronic heart failure.

Stefan Krüger1, Dagmar Kunz, Jürgen Graf

  • 1Medical Clinic I, University Hospital, University of Technology, Aachen, Germany. s.krueger@uniklinik-ulm.de

International Journal of Cardiology
|June 13, 2006
PubMed
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Patients with chronic heart failure (CHF) show increased tumor necrosis factor-alpha (TNFalpha) production and decreased human leukocyte antigen-DR (HLA-DR) expression. This suggests CHF patients are more susceptible to inflammatory stimuli.

Area of Science:

  • Immunology
  • Cardiology
  • Inflammation

Background:

  • Elevated endotoxin (lipopolysaccharides, LPS) levels are observed in chronic heart failure (CHF) patients.
  • Monocyte tolerance to LPS can be induced via negative feedback, downregulating cytokine response.
  • Endotoxin desensitization is implicated in CHF, prompting investigation into LPS challenge responses.

Purpose of the Study:

  • To investigate the ex vivo response to lipopolysaccharides (LPS) challenge in patients with chronic heart failure (CHF).
  • To assess monocyte human leukocyte antigen-DR (HLA-DR) expression and tumor necrosis factor-alpha (TNFalpha) generation in CHF patients compared to controls.

Main Methods:

  • Prospective study of 100 CHF patients (NYHA class II and III) and 21 controls.
  • Monocyte HLA-DR expression and TNFalpha generation were measured after ex vivo stimulation with LPS (50 and 500 pg/ml).

Related Experiment Videos

  • Left ventricular ejection fraction (LVEF) and New York Heart Association (NYHA) class were recorded.

    • Main Results:

    • HLA-DR expression was comparable in controls and NYHA II CHF patients but significantly lower in NYHA III CHF patients.
    • Ex vivo stimulated TNFalpha production was significantly higher in both NYHA II and NYHA III CHF patients compared to controls.
    • Higher LPS concentrations (500 pg/ml) resulted in greater TNFalpha generation in all groups.

    Conclusions:

    • Patients with chronic heart failure (CHF) exhibit increased TNFalpha generation capacity.
    • A decrease in HLA-DR expression is observed in CHF patients compared to healthy controls.
    • CHF patients demonstrate enhanced susceptibility to inflammatory stimuli due to altered immune responses.