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Related Experiment Video

Updated: May 26, 2026

An in vivo Rodent Model of Contraction-induced Injury and Non-invasive Monitoring of Recovery

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Published on: May 11, 2011

Myonuclear Dynamics After Skeletal Muscle Surgical Injury.

Micah Goeke¹, Nathan Serrano¹, Pieter Jan Koopmans^1,2

¹University of Arkansas, Molecular Muscle Mass Regulation Laboratory, Department of Health, Human Performance, and Recreation, Fayetteville, AR, USA.

Biorxiv : the Preprint Server for Biology

|May 25, 2026

Summary

Displaced myonuclei in damaged muscle fibers can originate from resident cells, not just satellite cells. This finding challenges existing beliefs and may impact therapeutic strategies for muscle injury repair.

Keywords:

Damage Regeneration Satellite Cells Surgery

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Identification and Analysis of Myogenic Progenitors In Vivo During Acute Skeletal Muscle Injury by High-Dimensional Single-Cell Mass Cytometry

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Published on: December 1, 2023

Area of Science:

Muscle physiology
Cell biology
Regenerative medicine

Background:

Displaced myonuclei are a key indicator of skeletal muscle fiber damage.
Traditionally, displaced myonuclei have been attributed solely to satellite cell fusion.

Purpose of the Study:

To investigate the origin and prevalence of displaced myonuclei following surgical muscle injury.
To challenge the dogma that only satellite cells contribute to displaced myonuclei.

Main Methods:

Utilized a surgical resection model for muscle injury.
Employed in vivo recombination-independent resident myonuclear labeling.
Analyzed myosin heavy chain expression and satellite cell populations post-injury.

Main Results:

Non-satellite cell-derived (resident) displaced myonuclei were observed 7 days post-injury, in similar proportions to satellite cell-derived ones.
A subset of embryonic myosin-expressing fibers contained resident displaced myonuclei.
Multiple resident displaced myonuclei were noted in muscle fibers 7 days after injury.
Satellite cell numbers did not increase until 7 days post-surgery.

Conclusions:

Resident myonuclei contribute to the pool of displaced myonuclei after muscle trauma.
The findings suggest that both satellite cell-dependent and independent mechanisms are involved in muscle repair.
This research could inform the development of targeted therapies for muscle injury.