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Related Experiment Videos

Imaging the permeability pore transition in single mitochondria

J Hüser1, C E Rechenmacher, L A Blatter

  • 1Department of Physiology, Stritch School of Medicine, Loyola University Chicago, Maywood, Illinois 60153, USA.

Biophysical Journal
|April 17, 1998
PubMed
Summary

The mitochondrial permeability transition pore (MTP) opens dynamically, causing rapid oscillations in mitochondrial membrane potential. This pore opening, crucial in cell damage, is more complex than previously thought.

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Area of Science:

  • Mitochondrial physiology
  • Cellular bioenergetics
  • Membrane biophysics

Background:

  • The mitochondrial permeability transition pore (MTP) is a large channel in the inner mitochondrial membrane.
  • MTP opening is linked to oxidative stress, calcium overload, and cell death pathways like apoptosis and excitotoxicity.
  • Previous studies on MTP focused on population-level responses, obscuring dynamic single-organelle behavior.

Purpose of the Study:

  • To investigate the dynamic behavior of the MTP in single isolated heart mitochondria.
  • To characterize the real-time regulation of mitochondrial membrane permeability at the organelle level.

Main Methods:

  • Confocal microscopy was used to measure membrane potential (Δψm) in single mitochondria using a voltage-sensitive fluorescent dye.

Related Experiment Videos

  • Mitochondrial inner membrane permeability was assessed by tracking the release of matrix-entrapped calcein.
  • The effect of the MTP inhibitor cyclosporin A on Δψm was evaluated.

    • Main Results:

    • Single mitochondria exhibited rapid, oscillatory depolarizations of Δψm, unlike the gradual loss observed in mitochondrial populations.
    • These rapid depolarizations correlated with increased inner mitochondrial membrane permeability, indicating MTP opening.
    • Cyclosporin A stabilized Δψm in single mitochondria, reducing the frequency of depolarizations.

    Conclusions:

    • Mitochondrial permeability transition pore opening and closing occur stochastically and dynamically at the single-organelle level.
    • The regulation of mitochondrial membrane permeability is far more dynamic than suggested by population-averaged measurements.
    • These findings provide new insights into the role of MTP dynamics in cellular energy regulation and pathology.