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A novel scheme of dystrophin disruption for the progression of advanced heart failure

Tomie Kawada1, Fujiko Masui, Asaki Tezuka

  • 1Division of Pharmacy, Niigata University of Medical and Dental Hospital, Niigata, 951-8520, Japan.

Biochimica Et Biophysica Acta
|August 2, 2005
PubMed

Insights

A new heart failure mechanism involves sarcolemma permeability, calpain activation, and dystrophin cleavage. This vicious cycle contributes to advanced heart failure, regardless of its origin.

Area of Science:

  • Cardiology
  • Molecular Biology
  • Genetics

Background:

  • The exact mechanisms driving advanced heart failure progression remain unclear.
  • Dystrophinopathies are linked to muscle weakness, but their role in heart failure needs further elucidation.

Purpose of the Study:

  • To investigate a novel mechanism contributing to advanced heart failure.
  • To explore the roles of sarcolemma integrity, calpains, and dystrophin in heart failure pathogenesis.

Main Methods:

  • Utilized two heart failure models: congenital dilated cardiomyopathy (DCM) in TO-2 hamsters and acute heart failure induced by isoproterenol in rats.
  • Assessed histological, physiological, and metabolic changes, dystrophin localization via immunostaining, sarcolemma fragility using Evans blue, and protein levels via Western blotting.
  • Investigated the effect of in vivo delta-sarcoglycan gene supplementation in TO-2 hamsters.

Main Results:

  • In TO-2 hamsters, increased myoplasmic dystrophin localization and sarcolemma fragility correlated with heart failure progression.
  • Calpain-1 and -2 levels were upregulated, suggesting protease involvement in dystrophin cleavage.
  • Isoproterenol-induced heart failure also showed dystrophin disruption, translocation, and fragmentation.
  • Gene supplementation improved pathological alterations and survival in TO-2 hamsters.

Conclusions:

  • A common pathway involving increased sarcolemma permeability, preferential calpain activation, and dystrophin cleavage contributes to advanced heart failure.
  • This vicious cycle is implicated in both hereditary (DCM) and acquired forms of heart failure.
  • Targeting this pathway may offer therapeutic strategies for advanced heart failure.

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