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Related Experiment Videos

Electrical coupling and plasticity of the mitochondrial network.

F De Giorgi1, L Lartigue, F Ichas

  • 1European Institute of Chemistry and Biology, & INSERM EMI-U.9929 Mitochondrial Physiology, Victor Segalen-Bordeaux 2 University, Bordeaux cedex, F-33076, France. degiorgi@u-bordeaux2.fr

Cell Calcium
|December 15, 2000
PubMed
Summary

Mitochondria form dynamic, electrically coupled networks in living cells. These networks coordinate electrical signals generated by the mitochondrial permeability transition pore (PTP), which is influenced by reactive oxygen species (ROS).

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Area of Science:

  • Cell Biology
  • Mitochondrial Physiology
  • Bioenergetics

Background:

  • Mitochondrial membrane potential (ΔΨm) is crucial for cellular energy production.
  • The mitochondrial permeability transition pore (PTP) regulates mitochondrial function and cell death.
  • Reactive oxygen species (ROS) are implicated in PTP opening and mitochondrial dysfunction.

Purpose of the Study:

  • To investigate the dynamic electrical coupling of mitochondria in living cells.
  • To characterize the role of the mitochondrial permeability transition pore (PTP) in mitochondrial network behavior.
  • To explore the influence of reactive oxygen species (ROS) on mitochondrial membrane potential (ΔΨm) dynamics.

Main Methods:

  • Kinetic fluorescence imaging to monitor mitochondrial membrane potential (ΔΨm).

Related Experiment Videos

  • Potentiometric probe tetramethylrhodamine methyl ester (TMRM) for ΔΨm detection.
  • Photoactivation of TMRM to induce localized ROS production and PTP gating.

    • Main Results:

    • Individual mitochondria exhibited stochastic ΔΨm flickering due to ROS-mediated PTP gating.
    • Synchronous ΔΨm transitions occurred in subgroups of mitochondria, indicating an electrically coupled network.
    • This mitochondrial network, comprising up to 65% of mitochondria, showed high plasticity, with units connecting and disconnecting dynamically.
    • The network was capable of commuting and coordinating electrical signals.

    Conclusions:

    • Living cells possess a dynamic, proton-conducting mitochondrial network.
    • This network electrically couples mitochondria, enabling coordinated responses to PTP events.
    • The mitochondrial network plays a role in signal commutation and coordination within the cell.