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Related Concept Videos

Mitochondria01:37

Mitochondria

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Mitochondria are eukaryotic cellular organelles that are known to produce energy through a process called oxidative phosphorylation. Besides their primary function, mitochondria are involved in various cellular processes, including cell growth, differentiation, signaling, metabolism, and senescence. Age-related changes cause a decline in mitochondrial quality and integrity due to increased mitochondrial mutations and oxidative damage. Thus, aging can severely impact mitochondrial functions,...
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The mitochondrial electron transport chain (ETC) is the main energy generation system in the eukaryotic cells. However, mitochondria also produce cytotoxic reactive oxygen species (ROS) due to the large electron flow during oxidative phosphorylation. While Complex I is one of the primary sources of superoxide radicals, ROS production by Complex II is uncommon and may only be observed in cancer cells with mutated complexes.
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A single mitochondrion is a bean-shaped organelle enclosed by a double-membrane system. The outer membrane of mitochondria is smooth and contains many porins - the integral membrane transporters. Porins enable free diffusion of ions and small uncharged molecules through the outer mitochondrial membrane but limit the transport of molecules larger than 5000 Daltons. Further, the outer mitochondrial membrane forms a unique structure called membrane contact sites with other subcellular organelles,...
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Mitochondrial precursors are translocated to the internal subcompartments via independent mechanisms involving distinct protein machineries called translocases.
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Related Experiment Video

Updated: Apr 23, 2026

Author Spotlight: Unveiling Mitochondrial Function and Cellular Metabolic Adaptation in Metabolic Diseases
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Genetically enhancing mitochondrial antioxidant activity improves muscle function in aging.

Alisa Umanskaya1, Gaetano Santulli1, Wenjun Xie1

  • 1Department of Physiology and Cellular Biophysics, The Clyde and Helen Wu Center for Molecular Cardiology, Columbia University College of Physicians and Surgeons, New York, NY 10032; and.

Proceedings of the National Academy of Sciences of the United States of America
|October 8, 2014
PubMed
Summary
This summary is machine-generated.

Mitochondrial free radicals contribute to age-related muscle dysfunction by increasing calcium (Ca2+) leak. Enhancing mitochondrial antioxidant activity in mice improved muscle function and reduced this leak, suggesting therapeutic potential.

Keywords:
agingexercise capacitymuscle weaknessoxidationskeletal muscle

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Area of Science:

  • Mitochondrial biology
  • Skeletal muscle physiology
  • Aging research

Background:

  • Age-related skeletal muscle dysfunction affects a significant portion of the elderly population.
  • Mitochondrial dysfunction and oxidative stress are implicated in aging processes.
  • Skeletal muscle contraction relies on precise calcium handling within the sarcoplasmic reticulum.

Purpose of the Study:

  • To investigate the impact of enhanced mitochondrial antioxidant activity on age-dependent skeletal muscle dysfunction.
  • To determine if increased mitochondrial catalase expression can mitigate age-related decline in muscle function.
  • To elucidate the role of mitochondrial reactive oxygen species in sarcoplasmic reticulum calcium handling defects.

Main Methods:

  • Utilized transgenic mice (MCat mice) overexpressing human catalase in mitochondria.
  • Compared aged MCat mice with age-matched wild-type (WT) littermates.
  • Assessed voluntary exercise, muscle specific force, tetanic Ca(2+) transients, intracellular Ca(2+) leak, and sarcoplasmic reticulum Ca(2+) load.
  • Analyzed ryanodine receptor 1 (RyR1) oxidation, calstabin1 association, and single channel open probability (Po).

Main Results:

  • Aged MCat mice showed improved exercise capacity and skeletal muscle force.
  • MCat mice exhibited reduced intracellular Ca(2+) leak and enhanced sarcoplasmic reticulum Ca(2+) load.
  • Ryanodine receptor 1 in aged MCat mice was less oxidized and had altered properties, suggesting reduced pathological calcium leak.
  • Mitochondrial targeted catalase improved age-related muscle function by mitigating RyR1 dysfunction.

Conclusions:

  • Mitochondrial free radicals directly contribute to age-dependent skeletal muscle dysfunction through pathological intracellular Ca(2+) leak.
  • Targeting mitochondrial antioxidant activity represents a promising therapeutic strategy for age-related muscle decline and mitochondrial myopathies.
  • Restoring mitochondrial function and reducing oxidative stress may improve healthspan and combat age-related diseases.