Freezing Injury in Mouse Masseter Muscle to Establish an Orofacial Muscle Fibrosis Model

Xu Cheng; Yixuan Huang; Yanan Li; Jingtao Li; Yan Wang

doi:10.3791/65847

Freezing Injury in Mouse Masseter Muscle to Establish an Orofacial Muscle Fibrosis Model

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Freezing Injury in Mouse Masseter Muscle to Establish an Orofacial Muscle Fibrosis Model

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06:33 min

December 29, 2023

DOI: 10.3791/65847-v

Xu Cheng*¹, Yixuan Huang*², Yanan Li², Jingtao Li², Yan Wang²

¹State Key Laboratory of Oral Diseases, West China School of Stomatology,Sichuan University, ²Department of Oral and Maxillofacial Surgery, West China School of Stomatology,Sichuan University

Overview

This study aims to develop a reliable mouse model for understanding orofacial muscle regeneration, particularly focusing on muscle fibrosis. The model demonstrates clear differences in regenerative capacities between the masseter and tibialis anterior muscles after induced injury.

Key Study Components

Research Area

Orofacial muscle regeneration
Skeletal muscle biology
Muscle fibrosis mechanisms

Background

Orofacial muscles have unique regenerative properties compared to limb muscles.
Previous studies largely overlook the orofacial region.
A comprehensive understanding of orofacial muscle fibrosis is needed.

Methods Used

Freezing injury protocol for muscle analysis
Mouse model
Histological and immunohistological staining techniques

Main Results

The tibialis anterior muscle showed full regeneration while the masseter muscle exhibited fibrosis.
Histology confirmed differences in morphology and extracellular matrix deposition.
Pax7 staining indicated altered satellite cell dynamics in the injured masseter compared to the control.

Conclusions

The study provides a new model for assessing orofacial muscle regeneration.
It highlights significant differences in regenerative mechanisms compared to limb muscles.

Frequently Asked Questions

What is the purpose of this study?

The study aims to establish a model for investigating orofacial muscle regeneration and fibrosis.

How does the orofacial muscle regeneration differ from limb muscle?

Orofacial muscles exhibit unique regeneration characteristics and fibrosis mechanisms compared to limb muscles.

What methods were used in this research?

A freezing injury protocol and various histological techniques were employed to analyze the muscles.

What were the main findings regarding the masseter and tibialis anterior muscles?

The tibialis anterior muscle fully regenerated, while the masseter muscle showed impaired regeneration and fibrosis.

Why is the study of orofacial muscle important?

It provides insights into unique regeneration processes and potential therapeutic targets for muscle-related conditions.

How does this research contribute to muscle biology?

It expands the understanding of muscle regeneration mechanisms, particularly in under-researched orofacial muscles.

The goal of this protocol is to establish an orofacial muscle fibrosis model. Comparison of the histology between mice masseter and tibialis anterior muscle after freezing injury confirmed masseter muscle fibrosis. This model will facilitate further investigation into the mechanism underlying orofacial muscle fibrosis.

Current skeletal muscle regeneration studies merely focus on the limb and the trunk muscle, leaving the characteristic and mechanism of orofacial muscle regeneration largely unexplored. The scope of this research is to create an easier and reliable mouse model to facilitate further investigation into muscle regeneration in the orofacial area. Recent developments review that orofacial muscles constitute a unique subset of skeletal muscle with a distinct evolutionary trajectory and developmental origin.

They also exhibit different regeneration performances compared with their limb counterparts. A deeper investigation into the orofacial muscle regeneration is warranted to figure out the mechanism underlying these marked differences. The study present a rapid and reproducible method to study orofacial muscle regeneration.

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