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Updated: Jun 23, 2026

A Flow Cytometry-based Assay for Measuring Mitochondrial Membrane Potential in Cardiac Myocytes After Hypoxia/Reoxygenation
07:14

A Flow Cytometry-based Assay for Measuring Mitochondrial Membrane Potential in Cardiac Myocytes After Hypoxia/Reoxygenation

Published on: July 13, 2018

Intracellular signaling pathways control mitochondrial events associated with the development of ischemia/

Robert Sucher1, Philipp Gehwolf, Thomas Kaier

  • 1Daniel Swarovski Research Laboratory (DSL), Department of Visceral, Transplant and Thoracic Surgery, Center of Operative Medicine, Innsbruck Medical University (IMU), Innsbruck, Austria.

Transplant International : Official Journal of the European Society for Organ Transplantation
|May 6, 2009
PubMed

Insights

Ischemia-reperfusion injury damages transplanted organs. Inhibiting p38 kinase reduced mitochondrial reactive oxygen species (ROS) and calcium overload, preventing cell death and organ damage.

Area of Science:

  • Cardiovascular Research
  • Transplantation Immunology
  • Mitochondrial Biology

Background:

  • Ischemia-reperfusion (I/R) injury is a major cause of transplanted organ damage.
  • Mitochondrial dysfunction, including reactive oxygen species (ROS) production and calcium dysregulation, is central to I/R injury.
  • Intracellular signaling pathways, such as mitogen-activated protein kinases (MAPKs), are implicated in regulating mitochondrial responses to I/R.

Purpose of the Study:

  • To investigate the role of MAPKs (ERK, JNK, p38) in mitochondrial ROS and calcium homeostasis during I/R.
  • To determine the therapeutic potential of targeting specific MAPK pathways to mitigate I/R-associated cardiomyocyte death.

Main Methods:

  • Utilized a heterotopic murine heart transplant model.
  • Employed primary and immortalized cardiomyocyte cell cultures.
  • Assessed MAPK activity, mitochondrial ROS levels, mitochondrial calcium, and cell viability following I/R.

Main Results:

  • Observed significant activation of ERK, JNK, and p38 MAPKs during early reoxygenation post-I/R.
  • Documented increased mitochondrial ROS production and calcium overload correlating with MAPK activation.
  • Demonstrated that p38 kinase inhibition most effectively suppressed ROS, calcium overload, and subsequent cardiomyocyte death.

Conclusions:

  • MAPK signaling pathways are critically involved in mediating mitochondrial dysfunction during I/R.
  • p38 MAPK activation plays a key role in I/R-induced mitochondrial ROS and calcium dysregulation.
  • Targeting p38 kinase represents a promising therapeutic strategy to protect transplanted organs from I/R injury.

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