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Integrins are the necessary links to hypertrophic growth in cardiomyocytes

Rebecca K Harston1, Dhandapani Kuppuswamy

  • 1Cardiology Division, Department of Medicine, Gazes Cardiac Research Institute, Medical University of South Carolina, Charleston, SC 29425-2221, USA.

Journal of Signal Transduction
|June 4, 2011
PubMed

Insights

Integrins on heart cells help manage pressure overload by activating survival signals. Understanding these integrin pathways could reveal new drug targets to prevent heart failure progression.

Area of Science:

  • Cardiovascular Biology
  • Cell Signaling
  • Integrin Biology

Background:

  • Hemodynamic overload stretches the heart, activating growth and survival pathways in cardiomyocytes.
  • Integrins, particularly α(5)β(1) and α(v)β(3), are key mechanotransduction receptors in cardiomyocytes.
  • Loss of β(1) or β(3) integrins impairs hypertrophic signaling and increases mortality during pressure overload.

Purpose of the Study:

  • To investigate emerging integrin pathways involved in inhibiting apoptosis during hemodynamic overload.
  • To further characterize the differential survival signaling activated by β(1) and β(3) integrins.
  • To identify potential drug targets for preventing heart failure decompensation.

Main Methods:

  • Analysis of integrin signaling pathways in cardiomyocytes under stress conditions.
  • Investigating downstream signaling cascades including ubiquitination and the PI3K/Akt pathway.
  • Comparative studies of β(1) and β(3) integrin function in response to mechanical stress.

Main Results:

  • Both β(1) and β(3) integrins initiate survival signaling pathways.
  • These survival pathways are activated downstream of ubiquitination and involve the PI3K/Akt kinase pathway.
  • Differential survival signaling mechanisms activated by β(1) and β(3) integrins were observed.

Conclusions:

  • Integrin-mediated signaling is crucial for cardiomyocyte survival during hemodynamic overload.
  • Understanding these specific integrin pathways offers potential therapeutic strategies.
  • Targeting integrin signaling may prevent the progression from compensated hypertrophy to heart failure.

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