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Isolation and Culture of Adult Mouse Cardiomyocytes for Cell Signaling and in vitro Cardiac Hypertrophy
06:51

Isolation and Culture of Adult Mouse Cardiomyocytes for Cell Signaling and in vitro Cardiac Hypertrophy

Published on: May 21, 2014

Signal transduction pathways through cytoprotective, apoptotic and hypertrophic stimuli: a comparative study in adult

Thomais Markou1, Eleftheria Barlaka, Monica Bartucci

  • 1Laboratory of Animal Physiology, Department of Zoology, School of Biology, Aristotle University of Thessaloniki, Thessaloniki, Greece.

Cell Biochemistry and Function
|July 14, 2011
PubMed

Insights

Cardiac myocytes respond to stress via hypertrophy or apoptosis, involving complex signaling pathways like MAPKs and Akt. This study reveals these pathways are shared, with activation timing and strength determining cell fate, not pathway specificity.

Area of Science:

  • Cardiovascular Biology
  • Cell Signaling
  • Molecular Cardiology

Background:

  • Cardiac myocytes exhibit hypertrophic growth or apoptosis in response to pathophysiological stress.
  • Mitogen-activated protein kinases (MAPKs) and Akt are key kinases implicated in these cellular responses.
  • Conflicting data exists regarding the specificity of signaling pathways for hypertrophy, apoptosis, or cell survival.

Purpose of the Study:

  • To compare intracellular signaling activated by diverse stimuli in adult rat cardiac myocytes.
  • To assess the role of these stimuli in promoting hypertrophy, cell survival, or apoptosis.
  • To elucidate the network behavior of signaling pathways in determining cardiac myocyte fate.

Main Methods:

  • Utilized adult rat cardiac myocytes as a single experimental system.
  • Administered diverse stimuli including phenylephrine, hydrogen peroxide (H₂O₂), and insulin-like growth factor-1 (IGF-1).
  • Assessed phosphorylation of MAPKs, MSK1, and Akt to evaluate pathway activation.

Main Results:

  • Phenylephrine potently activated MAPKs/MSK1 but had a minor effect on Akt.
  • Pro-apoptotic H₂O₂ strongly activated both MAPKs and PI3K/Akt pathways.
  • IGF-1 minimally affected MAPKs/MSK1 but potently activated Akt.

Conclusions:

  • Hypertrophic, pro-survival, and apoptotic stimuli engage common signaling pathways.
  • The time course and amplitude of kinase activation, rather than pathway specificity, dictate cell fate.
  • Signaling pathways should be assessed as a network to understand their impact on cardiac myocyte cell fate.

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