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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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After cellular or tissue damage, the resident stem cells present in the human body can locally repair and regenerate the damaged tissue or organ. However, even though some tissues do not have stem cells, they can repair and regenerate with the help of pre-existing cells. For example, beta cells of the pancreas and hepatocytes of the liver can divide to renew and regenerate the tissue. Here, both cell division and cell death are well regulated by homeostasis.
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Stem cell therapy is a method used in regenerative medicine to repair and restore function to damaged tissues and organs. Stem cells have the potential to proliferate and differentiate into various tissue types, making them ideal candidates for tissue regeneration. For example, hematopoietic stem cell transplants are commonly used in blood cancer treatment to replenish damaged bone marrow and restore healthy blood cells.
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Adult Stem Cells01:33

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Stem cells are undifferentiated cells that divide and produce more stem cells or progenitor cells that differentiate into mature, specialized cell types. All the cells in the body are generated from stem cells in the early embryo, but small populations of stem cells are also present in many adult tissues including the bone marrow, brain, skin, and gut. These adult stem cells typically produce the various cell types found in that tissue—to replace cells that are damaged or to continuously...
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The skin is divided into epidermis, dermis, and hypodermis, the skin's outermost, middle, and inner layers. The human epidermal layer regularly undergoes renewal, where old, dead cells are replaced by new cells. Epidermal stem cells or EpiSCs divide and differentiate to restore the lost cells. For the renewal process, some EpiSCs continuously self-renew. In contrast, few others differentiate into transit-amplifying cells, which later form prickle or spinous cells, followed by granular...
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The intestinal epithelial lining rapidly renews every 4 to 5 days. The renewal is facilitated by intestinal stem cells (ISCs) located at the base of the crypt– a gland located at the bottom of each villus. ISCs divide asymmetrically to form new stem cells and progenitor daughter cells. The daughter cells are called transit-amplifying (TA) cells which move upwards along the crypt and either differentiate into absorptive cells– the enterocytes or secretory cells– including the...
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Updated: Dec 20, 2025

Single Myofiber Culture Assay for the Assessment of Adult Muscle Stem Cell Functionality Ex Vivo
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Single Myofiber Culture Assay for the Assessment of Adult Muscle Stem Cell Functionality Ex Vivo

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Exercise Partially Rejuvenates Muscle Stem Cells.

James W Larrick1,2, Andrew R Mendelsohn1,2

  • 1Panorama Research Institute, Sunnyvale, California, USA.

Rejuvenation Research
|June 3, 2020
PubMed
Summary
This summary is machine-generated.

Exercise can rejuvenate aging muscle stem cells (MuSCs) in mice by restoring their regenerative function and youthful gene expression. This occurs through increased cyclin D1, which counteracts age-related signaling pathways, though the effect is temporary and incomplete.

Keywords:
TGF-betaagingcyclin D1longevityregenerationstem cells

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Area of Science:

  • Muscle stem cell biology
  • Aging and regeneration
  • Molecular mechanisms of exercise

Background:

  • Aging leads to a decline in muscle stem cell (MuSC) regenerative capacity.
  • Exercise is generally believed to slow age-related functional decline.
  • The molecular mechanisms by which exercise might reverse aging in stem cells are not fully understood.

Purpose of the Study:

  • To investigate the effects of exercise on the regenerative function and molecular profile of aged muscle stem cells (MuSCs) in mice.
  • To elucidate the molecular pathways involved in exercise-induced rejuvenation of MuSCs.
  • To determine the limitations and permanence of exercise's rejuvenative effects on MuSCs.

Main Methods:

  • Comparative analysis of muscle stem cells (MuSCs) from young and aged mice, with and without exercise.
  • Assessment of MuSC regenerative competency and transcriptional signatures.
  • Molecular analyses to identify key signaling pathways and factors, including cyclin D1, TGF-beta/Smad3, NF-κB, TNF-alpha, IL-6, and Notch signaling.

Main Results:

  • Exercise restored functional competency and partially reversed the transcriptional signature of aged MuSCs towards a younger state.
  • The mechanism involves exercise-induced plasma factors that upregulate cyclin D1, which attenuates TGF-beta/Smad3 signaling.
  • Exercise reduced pro-inflammatory regulators (NF-κB, TNF-alpha, IL-6) and was mimicked by ectopic cyclin D1 expression.

Conclusions:

  • Exercise can induce a significant, albeit incomplete and temporary, rejuvenation of aged muscle stem cells (MuSCs) in mice.
  • The primary mechanism involves cyclin D1-mediated attenuation of age-associated TGF-beta/Smad3 signaling.
  • Further research into molecular and epigenetic changes is crucial for developing advanced rejuvenation therapies for aging populations.