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Related Concept Videos

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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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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Related Experiment Video

Updated: Nov 18, 2025

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

Silvia Campanario1,2, Ignacio Ramírez-Pardo1,2, Xiaotong Hong1,2

  • 1Centro Nacional de Investigaciones Cardiovasculares (CNIC), Madrid, Spain.

Frontiers in Cell and Developmental Biology
|February 8, 2021
PubMed
Summary

Autophagy is crucial for skeletal muscle stem cell function and regeneration. Enhancing autophagy can restore regenerative capacity in aged muscle stem cells, highlighting its therapeutic potential.

Keywords:
autophagyflow cytometryimmunofluorescencequiescenceregenerationsatellite cellskeletal musclestem cell

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Area of Science:

  • Cell Biology
  • Regenerative Medicine
  • Muscle Physiology

Background:

  • Skeletal muscle stem cells (satellite cells) are vital for muscle regeneration.
  • Satellite cell function, including quiescence and activation, depends on autophagy for proteostasis.
  • Aging impairs satellite cell regenerative capacity, associated with reduced autophagy.

Purpose of the Study:

  • To present methods for assessing autophagic activity in skeletal muscle stem cells.
  • To investigate the role of autophagy in satellite cell function during aging and regeneration.

Main Methods:

  • Utilized GFP-LC3 reporter mice for direct autophagosome labeling.
  • Employed immunofluorescence staining for autophagosomes in wild-type satellite cells.
  • Assessed autophagic activity via flow cytometry and immunofluorescence by inhibiting autophagosome-lysosome fusion.

Main Results:

  • Developed rapid assessment methods for autophagy in satellite cells.
  • Demonstrated that impaired autophagy correlates with reduced regenerative capacity in aged muscle.
  • Showed that enhancing autophagy can restore regenerative functions in aged satellite cells.

Conclusions:

  • Autophagy is essential for maintaining skeletal muscle stem cell function and regenerative potential.
  • The presented methods allow for efficient evaluation of autophagy in satellite cells across various physiological and pathological states.
  • Targeting autophagy presents a promising strategy for improving muscle regeneration, particularly in the context of aging and disease.