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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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Mitochondrial Precursor Proteins01:39

Mitochondrial Precursor Proteins

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Mitochondrial precursors are partially unfolded or loosely folded polypeptide chains. Newly synthesized precursors are inhibited from spontaneously folding into their native conformation by the cytosolic chaperones, heat shock proteins 70 (Hsp70), and mitochondrial import stimulation factors (MSFs). Precursors bound to MSFs are guided to the TOM70-TOM37 receptors, while precursors bound to Hsp70  chaperones are targetted to TOM20-TOM22 receptor complexes.
Most of the mitochondrial...
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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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Mitochondria Initiate and Regulate Sarcopenia.

Stephen E Alway1, Junaith S Mohamed, Matthew J Myers

  • 11Division of Exercise Physiology; 2Center for Cardiovascular and Respiratory Sciences, and Mitochondria, Metabolism, and Bioenergetics; and 3Centers for Neuroscience, West Virginia University School of Medicine, Morgantown, WV.

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Dysfunctional mitochondria trigger cell death, leading to sarcopenia. Reversing mitochondrial issues may prevent this age-related muscle loss.

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Area of Science:

  • Gerontology
  • Cell Biology
  • Neuroscience

Background:

  • Sarcopenia is characterized by progressive loss of skeletal muscle mass and function.
  • Mitochondrial dysfunction is implicated in aging and various age-related diseases.
  • The specific role of mitochondria in initiating sarcopenia remains incompletely understood.

Purpose of the Study:

  • To propose a hypothesis linking mitochondrial dysfunction to the pathogenesis of sarcopenia.
  • To elucidate the signaling pathways involved in mitochondrial dysfunction-induced cell death.
  • To identify potential therapeutic targets for preventing sarcopenia.

Main Methods:

  • This study is primarily a hypothesis-driven review and conceptual framework.
  • It synthesizes existing literature on mitochondrial biology, neurobiology, and muscle physiology.
  • No new experimental data were generated.

Main Results:

  • The hypothesis posits that accumulating dysfunctional mitochondria initiate a cell death cascade.
  • This cascade affects motor neurons and muscle fibers, culminating in sarcopenia.
  • Interactions between neural and muscle cells with dysfunctional mitochondria worsen sarcopenia.

Conclusions:

  • Mitochondrial dysfunction is a key initiating factor in sarcopenia.
  • Targeting reversible sources of mitochondrial dysfunction is crucial for sarcopenia prevention.
  • Further research is needed to validate these mechanisms and explore therapeutic interventions.