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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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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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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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Skeletal muscle mitochondrial energetic efficiency and aging.

Raffaella Crescenzo1, Francesca Bianco2, Arianna Mazzoli3

  • 1Department of Biology, University of Naples "Federico II", Napoli I-80126, Italy. rcrescen@unina.it.

International Journal of Molecular Sciences
|May 14, 2015
PubMed
Summary

Mitochondrial function in aging skeletal muscle is complex. This review examines subsarcolemmal and intermyofibrillar mitochondria, highlighting factors influencing ATP production during aging.

Keywords:
agingmitochondriaproton leakskeletal muscle

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Area of Science:

  • Gerontology and cellular biology
  • Mitochondrial research
  • Skeletal muscle physiology

Background:

  • Cellular function declines with age, impacting ATP availability.
  • Mitochondria are central to cellular energy production and aging.
  • Skeletal muscle mitochondria exhibit varied performance during aging.

Purpose of the Study:

  • To review mitochondrial functionality in aging skeletal muscle.
  • To differentiate between subsarcolemmal and intermyofibrillar mitochondria.
  • To explore factors affecting mitochondrial ATP synthesis.

Main Methods:

  • Literature review of aging and skeletal muscle mitochondrial studies.
  • Analysis of studies assessing mitochondrial number, activity, and efficiency.
  • Examination of ATP synthesis from fuel oxidation.

Main Results:

  • Mitochondrial performance in aging muscle is inconsistently reported.
  • Methodological differences may explain result heterogeneity.
  • Subsarcolemmal and intermyofibrillar mitochondria show distinct aging patterns.

Conclusions:

  • Understanding mitochondrial heterogeneity is crucial for aging research.
  • Mitochondrial number, activity, and energetic efficiency impact cellular aging.
  • Further research is needed to clarify mitochondrial roles in muscle aging.