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Related Concept Videos

Autophagy01:27

Autophagy

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Autophagy is a self-digesting process by which a cell protects itself from threats both within and outside the cell, ranging from abnormal proteins to invading bacteria. In this process, obsolete components of the cell and invading microbes are degraded by hydrolytic enzymes active in an acidic environment of the lysosomal lumen.
An autophagic pathway consists of a series of signaling events activated in response to diverse stress and physiological conditions such as food deprivation,...
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Delivery Pathways to the Lysosome01:36

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Eukaryotic cells use different mechanisms to eliminate toxic waste obsolete and worn-out substances. Lysosomes play a pivotal role in this, and hence, these substances are carried to the lysosome from other parts of the cell and extracellular space through different pathways. The most elaborately studied pathways to the lysosome are the endocytic pathways.
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Autophagic Cell Death01:18

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Christian de Duve discovered “autophagy,” a process in which cellular components are engulfed by membrane-bound organelles called autophagosomes. The autophagosomes then fuse with lysosomes to digest the enclosed contents. Autophagy is generally activated in cells to prevent cell death. However, cell death is triggered when the damage is beyond repair.
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Cross-bridge Cycle01:26

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As muscle contracts, the overlap between the thin and thick filaments increases, decreasing the length of the sarcomere—the contractile unit of the muscle—using energy in the form of ATP. At the molecular level, this is a cyclic, multistep process that involves binding and hydrolysis of ATP, and movement of actin by myosin.
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Satellite Stem Cells and Muscular Dystrophy01:21

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Satellite stem cells or myosatellite cells are quiescent stem cells that Alexander Mauro first identified in 1961. These cells are located between the sarcolemma, the plasma membrane of muscle fibers, and the basal lamina, the connective tissue sheath covering it. These mononucleated cells are activated in response to muscle injury, can transform into myoblasts, and may form or repair muscle fibers. Myosatellite cells can provide additional myonuclei for muscle regeneration or return to a...
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Muscle fatigue refers to the decline in a muscle's ability to maintain the force of contraction after prolonged activity. It primarily stems from changes within muscle fibers. Even before experiencing muscle fatigue, one may feel tired and have the urge to stop the activity. This response, known as central fatigue, occurs due to changes in the central nervous system, namely the brain and spinal cord. While there is no single mechanism that induces fatigue, it may serve as a protective...
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Related Experiment Video

Updated: Jun 17, 2025

In Situ Immunofluorescent Staining of Autophagy in Muscle Stem Cells
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Autophagy in Skeletal Muscle.

Anais Franco-Romero1,2, Marco Sandri3,2,4, Stefano Schiaffino3

  • 1Veneto Institute of Molecular Medicine, 35129 Padova, Italy.

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|August 12, 2024
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Summary

Autophagy, a cellular recycling process, is vital for skeletal muscle health. Enhancing autophagy may help delay age-related muscle dysfunction.

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Area of Science:

  • Cellular Biology
  • Muscle Physiology
  • Biochemistry

Background:

  • Skeletal muscle fibers utilize autophagy, an evolutionarily conserved process, for degrading damaged proteins and organelles.
  • This cellular mechanism is crucial for maintaining muscle homeostasis and protein turnover.
  • Autophagy can be selective, targeting specific components like mitochondria (mitophagy) or glycogen (glycophagy).

Purpose of the Study:

  • To explore the role of autophagy in skeletal muscle function and maintenance.
  • To investigate the impact of exercise and aging on muscle autophagy.
  • To suggest potential therapeutic strategies for age-related muscle decline by modulating autophagy.

Main Methods:

  • The study is a review of existing literature on autophagy in skeletal muscle.
  • It synthesizes findings on the molecular mechanisms and physiological relevance of autophagy.
  • It discusses genetic and physiological factors influencing autophagic flux.

Main Results:

  • Autophagy is essential for normal muscle protein and organelle turnover, with genetic blocks leading to degenerative changes.
  • Autophagic flux is activated during fasting, supplying amino acids for survival.
  • Exercise enhances muscle autophagy, while aging impairs it.

Conclusions:

  • Autophagy plays a critical role in skeletal muscle health and function.
  • Impaired autophagy during aging contributes to muscle dysfunction.
  • Boosting autophagy presents a potential strategy to mitigate age-related muscle decline.