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Enhanced myocardial cathepsin B expression in patients with dilated cardiomyopathy

Junbo Ge1, Gang Zhao, Ruizhen Chen

  • 1Shanghai Institute of Cardiovascular Diseases, Zhongshan Hospital, Fudan University, Fenglin Road 180, Shanghai 200032, PR China. gejunbo@zshospital.net

European Journal of Heart Failure
|February 17, 2006
PubMed

Insights

Heart failure is linked to increased levels of cathepsin B, a lysosomal protease. This finding suggests cathepsin B may contribute to the development of heart failure.

Area of Science:

  • Cardiology
  • Molecular Biology
  • Biochemistry

Background:

  • Cathepsin B is a lysosomal protease implicated in apoptosis and myofibrillar protein degradation during myocardial infarction.
  • Understanding its role in human heart failure is crucial for therapeutic development.

Purpose of the Study:

  • To investigate myocardial cathepsin B expression in failing and non-failing human hearts.
  • To explore the correlation between cathepsin B levels and heart function.

Main Methods:

  • Analysis of left ventricle tissue samples from heart failure patients and non-failing donors.
  • Quantification of cathepsin B expression using immunohistochemistry, RT-PCR, and Western blotting.
  • Assessment of apoptosis via TUNEL staining.

Main Results:

  • Cathepsin B expression (mRNA and protein) was significantly elevated in failing hearts compared to non-failing hearts.
  • Higher cathepsin B levels negatively correlated with ejection fraction (EF) in heart failure patients.
  • The apoptotic index was significantly higher in failing hearts.

Conclusions:

  • Increased myocardial cathepsin B expression is observed in human heart failure.
  • Cathepsin B may play a role in the pathogenesis and progression of heart failure.
Abstract

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