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A method for isolating and cryopreserving intact mitochondria with improved integrity and functionality.

Arima Okutani1, Jannatul Naima1,2, Asaka Ogihara1

  • 1Division of Biotechnology and Life Sciences, Tokyo University of Agriculture and Technology, Koganei, Tokyo 184-8588, Japan.

Biophysics and Physicobiology
|July 7, 2025
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Summary

Researchers developed new methods for isolating and cryopreserving mitochondria, crucial for biological research. These techniques improve mitochondrial integrity and function after freezing and thawing, enhancing their usability.

Keywords:
cryopreservationisolationmitochondria

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Area of Science:

  • Cell Biology
  • Biochemistry

Background:

  • Isolated mitochondria are vital research tools but are often damaged during isolation.
  • Cryopreservation improves usability but typically causes significant activity loss after freeze-thaw cycles.

Purpose of the Study:

  • To present novel techniques for mitochondrial isolation and cryopreservation.
  • To overcome challenges associated with mitochondrial damage and activity loss.

Main Methods:

  • Selective plasma membrane weakening using digitonin without increasing permeability.
  • Controlled plasma membrane rupture to release mitochondria, utilizing mitochondrial contraction.
  • Rapid thawing protocol (under 1.5 minutes) for cryopreserved mitochondria.

Main Results:

  • Isolated mitochondria exhibited polarized inner membranes in ~90% of the population.
  • Improved retention of intermembrane space proteins and outer membrane integrity compared to homogenization.
  • Rapid thawing preserved mitochondrial activity, with only a ~10% decrease in polarized mitochondria.

Conclusions:

  • The developed isolation and cryopreservation protocols effectively maintain mitochondrial integrity and function.
  • These methods offer a promising approach for applications requiring intact, functional isolated mitochondria.