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A Murine Model of Muscle Training by Neuromuscular Electrical Stimulation

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Published on: May 9, 2012

Decrease of MMP-9 activity improves soleus muscle regeneration.

Malgorzata Zimowska¹, Krzysztof H Olszynski, Marta Swierczynska

¹Department of Cytology, Faculty of Biology, University of Warsaw, Warsaw, Poland. mzimowska@biol.uw.edu.pl

Tissue Engineering. Part A

|March 21, 2012

Summary

This summary is machine-generated.

Inhibiting matrix metalloproteinase-9 (MMP-9) activity improves slow-twitch Soleus muscle regeneration and reduces fibrosis. This study investigated MMP-9 and MMP-2 roles in muscle repair and myoblast differentiation.

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Identification, Isolation, and Characterization of Fibro-Adipogenic Progenitors (FAPs) and Myogenic Progenitors (MPs) in Skeletal Muscle in the Rat

Identification, Isolation, and Characterization of Fibro-Adipogenic Progenitors (FAPs) and Myogenic Progenitors (MPs) in Skeletal Muscle in the Rat

Published on: June 9, 2021

Area of Science:

Muscle regeneration
Extracellular matrix remodeling
Biochemistry

Background:

Satellite cells are crucial for skeletal muscle regeneration after injury.
Extracellular matrix remodeling, mediated by matrix metalloproteinases (MMPs), is vital for muscle repair.
Soleus slow-twitch muscle regeneration is often impaired by fibrosis.

Purpose of the Study:

To investigate the impact of inhibiting matrix metalloproteinase-9 (MMP-9) and MMP-2 on Soleus muscle regeneration.
To assess the effect of MMP inhibition on in vitro myoblast differentiation.
To analyze MMP activity during muscle regeneration and myoblast differentiation.

Main Methods:

In situ and in-gel zymography to assess MMP activity.
Histological analysis of regenerating Soleus muscles.
Morphological assessment of differentiating myoblasts in vitro.
Treatment with doxycycline and anti-MMP-9 or anti-MMP-2 antibodies.

Main Results:

Inhibition of MMP-9, but not MMP-2, significantly enhanced Soleus muscle regeneration in vivo.
MMP-9 inhibition ameliorated excessive fibrosis development in regenerating muscle.
In vitro studies showed delayed myoblast proliferation and differentiation upon MMP-9 inhibition.
Doxycycline and anti-MMP-9 treatments improved muscle regeneration and reduced fibrosis.

Conclusions:

MMP-9 plays a critical role in hindering Soleus muscle regeneration and promoting fibrosis.
Targeting MMP-9 activity holds therapeutic potential for improving skeletal muscle repair, particularly in slow-twitch muscles.
Modulating MMP activity can influence myoblast behavior during differentiation.