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Satellite Stem Cells and Muscular Dystrophy

Satellite Stem Cells and Muscular Dystrophy

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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Related Experiment Video

Updated: Apr 27, 2026

Analyzing Satellite Cell Function During Skeletal Muscle Regeneration by Cardiotoxin Injury and Injection of Self-delivering siRNA In Vivo

Analyzing Satellite Cell Function During Skeletal Muscle Regeneration by Cardiotoxin Injury and Injection of Self-delivering siRNA In Vivo

Published on: September 18, 2019

Laminin-111 improves skeletal muscle stem cell quantity and function following eccentric exercise.

Kai Zou¹, Michael De Lisio¹, Heather D Huntsman¹

¹Department of Kinesiology and Community Health, Beckman Institute for Advanced Science and Technology, and Division of Biomedical Sciences, University of Illinois, Urbana, Illinois, USA.

Stem Cells Translational Medicine

|July 13, 2014

Summary

Laminin-111 (LM-111) supplementation significantly increased skeletal muscle stem cell numbers and proliferation following exercise-induced damage in mice. This suggests LM-111 enhances muscle regeneration and repair capabilities.

Keywords:

Downhill running Hepatocyte growth factor (HGF)Mesenchymal stem cells Repair Satellite cells

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Published on: February 15, 2021

Area of Science:

Muscle stem cell biology
Extracellular matrix research
Exercise physiology

Background:

Laminin-111 (LM-111) is crucial for skeletal muscle development.
LM-111 supplementation may improve muscle function in muscular dystrophy models.
Its role in healthy muscle regeneration after damage is less understood.

Purpose of the Study:

To investigate LM-111's effect on satellite and nonsatellite stem cell populations after eccentric exercise in healthy mice.
To assess LM-111's impact on muscle regeneration markers.

Main Methods:

Young adult mice received LM-111 or saline injections.
Mice were either sedentary or underwent downhill running (eccentric exercise).
Satellite cell number, proliferation (Ki67), and mesenchymal stem cells (MSCs) were analyzed post-exercise.

Main Results:

LM-111 significantly increased satellite cell number (twofold) and proliferation (50-300%) post-exercise.
LM-111 elevated embryonic myosin heavy chain-positive (eMHC+) fibers, indicating enhanced regeneration.
MSC gene expression shifted towards reduced inflammation and increased hepatocyte growth factor.

Conclusions:

LM-111 supplementation effectively boosts skeletal muscle stem cell numbers and function.
LM-111 enhances the regenerative response to exercise-induced muscle damage.
This highlights LM-111's potential therapeutic value for muscle repair.