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Related Experiment Video

Updated: Jul 30, 2026

Functional and Morphological Assessment of Diaphragm Innervation by Phrenic Motor Neurons
09:43

Functional and Morphological Assessment of Diaphragm Innervation by Phrenic Motor Neurons

Published on: May 25, 2015

Time-based gene expression programme following diaphragm injury in a rat model.

S N Mehiri1, E Barreiro, M Hayot

  • 1Laboratoire de physiologie respiratoire, Centre hopitalier de l'Université de Montréal, Hôpital Notre-Dame, Montreal, QC, Canada H2L 4M1. sn.mhiri@umontreal.ca

The European Respiratory Journal
|March 2, 2005
PubMed
Summary

Diaphragm injury triggers a timed gene expression program for muscle repair. Key genes like proteases, transcription factors, growth factors, and structural proteins show specific expression patterns post-injury.

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Area of Science:

  • Muscle physiology
  • Molecular biology
  • Regenerative medicine

Background:

  • Diaphragm muscle injuries can impair respiratory function.
  • Understanding the molecular mechanisms of muscle repair is crucial for developing therapeutic strategies.

Purpose of the Study:

  • To investigate the temporal gene expression patterns following diaphragm injury.
  • To identify key genes involved in the muscle repair process.

Main Methods:

  • Caffeine-induced diaphragm injury model in rats.
  • Quantitative reverse transcription-polymerase chain reaction (RT-PCR) to measure gene expression.
  • Analysis of gene expression at various time points (1-240 hours post-injury).

Main Results:

  • Protease (p94) expression peaked at 1 hour post-injury.
  • Transcription factors (cFos, myogenin) and growth factors (IGF-II, bFGF) exhibited distinct temporal expression profiles.
  • Structural proteins (MHC, titin) showed significant elevation at 72 hours post-injury.

Conclusions:

  • Diaphragm injury initiates a coordinated, time-dependent gene expression program.
  • This program involves a sequential activation of genes critical for muscle regeneration and repair.