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Adenoviral expression of calmodulin antisense reduces hypertrophy in cultured cardiomyocytes

Ligia H Arruda1, Idágene A Cestari, Adolfo A Leirner

  • 1Postgraduate Program in Biotechnology, University of São Paulo, and Center of Biomedical Technology, Bioengineering Division of the Heart Institute (InCor), University of São Paulo Medical School, São Paulo, Brazil.

Artificial Organs
|April 18, 2007
PubMed

Insights

Adenovirus-mediated calmodulin (CaM) antisense expression inhibited cardiac myocyte hypertrophy. This suggests CaM plays a key role in cardiac hypertrophy, offering potential therapeutic targets for heart failure.

Area of Science:

  • Cardiovascular Biology
  • Molecular Cardiology
  • Gene Therapy

Background:

  • Sustained cardiac hypertrophy increases risks of sudden death and heart failure.
  • Understanding signaling pathways in cardiac hypertrophy is crucial for identifying therapeutic targets.

Purpose of the Study:

  • To investigate if adenovirus-mediated calmodulin (CaM) antisense expression can inhibit cardiac hypertrophy.
  • To assess the role of CaM availability in the hypertrophic response of cardiomyocytes.

Main Methods:

  • Constructed three adenoviruses: AdASCaM (CaM antisense + GFP), AdCaM (CaM + GFP), and AdGFP (control).
  • Infected neonatal rat ventricular cardiomyocytes with adenoviruses.
  • Stimulated cells with phenylephrine (PE) or angiotensin II (AngII) and measured cell surface area.

Main Results:

  • AdASCaM significantly inhibited PE- or AngII-induced cardiomyocyte hypertrophy compared to AdGFP.
  • Cardiomyocytes infected with AdCaM showed increased surface area compared to AdGFP.
  • Adenoviral CaM antisense expression reduced intracellular CaM availability, inhibiting hypertrophy.

Conclusions:

  • Adenovirus-mediated modulation of CaM expression impacts cardiac myocyte size.
  • CaM is a critical mediator of cardiac hypertrophy.
  • Targeting CaM offers a potential therapeutic strategy for preventing or treating cardiac hypertrophy.

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