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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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Mitochondrial Membranes01:45

Mitochondrial Membranes

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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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Translocation of Proteins into the Mitochondria01:19

Translocation of Proteins into the Mitochondria

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Mitochondrial precursors are translocated to the internal subcompartments via independent mechanisms involving distinct protein machineries called translocases.
Sorting of outer membrane proteins:
Mitochondrial outer membrane proteins are of two types: the transmembrane, beta-barrel porins, and the membrane-anchored, alpha-helical proteins. Beta-barrel porin precursors are translocated by the TOM complex and inserted into the outer mitochondrial membrane by the SAM complex. In contrast,...
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The Inner Mitochondrial Membrane01:28

The Inner Mitochondrial Membrane

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The inner mitochondrial membrane is the primary site of ATP synthesis. The inner membrane domain that forms a smooth layer adjacent to the outer membrane is called the inner boundary membrane. This domain contains membrane transporters that drive metabolites in and out of the mitochondria.  In contrast, the inner membrane network that invaginates into the matrix space is called the cristae membrane. This domain accounts for principle mitochondrial function as it accommodates the protein...
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Electron Transport Chain: Complex I and II01:46

Electron Transport Chain: Complex I and II

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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.
ROS generation is regulated and maintained at moderate levels necessary...
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ATP Synthase: Mechanism01:48

ATP Synthase: Mechanism

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In animals, the mitochondrial F1F0 ATP synthase is the key protein that synthesizes ATP molecules through a complex catalytic mechanism. While the nuclear genome encodes the majority of ATP synthase subunits, the mitochondrial genome encodes some of the enzyme's most critical components. The formation of this multi-subunit enzyme is a complex multi-step process regulated at the level of transcription, translation, and assembly. Defects in one or more of these steps can result in decreased...
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Author Spotlight: Unveiling Mitochondrial Function and Cellular Metabolic Adaptation in Metabolic Diseases
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Author Spotlight: Unveiling Mitochondrial Function and Cellular Metabolic Adaptation in Metabolic Diseases

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Mitochondrial involvement in sarcopenia.

Charles Affourtit1, Jane E Carré1

  • 1School of Biomedical Sciences, University of Plymouth, Plymouth, UK.

Acta Physiologica (Oxford, England)
|February 2, 2024
PubMed
Summary
This summary is machine-generated.

Sarcopenia, an age-related muscle loss, may involve mitochondria adapting to lower energy needs, not failing. Understanding this adaptation is key to developing new sarcopenia therapies.

Keywords:
cellular bioenergeticssarcopeniaskeletal muscle mitochondria

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Area of Science:

  • Gerontology
  • Muscle Physiology
  • Mitochondrial Biology

Background:

  • Sarcopenia, characterized by skeletal muscle mass and function decline, significantly impacts quality-of-life and is linked to aging and disease.
  • Physical activity is the primary intervention, but alternative therapies are needed for individuals unable to exercise.
  • Mitochondria are implicated in sarcopenia, with potential as therapeutic targets to rebalance muscle protein synthesis and breakdown.

Purpose of the Study:

  • To review current literature on mitochondrial bioenergetics in sarcopenia.
  • To challenge the prevailing view of intrinsic mitochondrial dysfunction in sarcopenia.
  • To propose an alternative hypothesis where observed mitochondrial changes are adaptive responses.

Main Methods:

  • Literature review of sarcopenia and mitochondrial function.
  • Analysis of reported effects of therapeutic interventions on sarcopenic muscle.
  • Comparative analysis of proposed mechanisms for mitochondrial changes.

Main Results:

  • Mitochondrial bioenergetic changes in sarcopenia are often interpreted as intrinsic cellular dysfunction.
  • Therapeutic interventions suggest these changes might be adaptations to reduced energy expenditure in sarcopenic muscle.
  • Distinguishing between dysfunction and adaptation is critical for effective treatment.

Conclusions:

  • The role of mitochondria in sarcopenia may be adaptive rather than solely dysfunctional.
  • Reinterpreting mitochondrial bioenergetic changes offers new therapeutic avenues.
  • Further research is needed to differentiate between these mechanisms for improved sarcopenia management.