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Functional and Morphological Assessment of Diaphragm Innervation by Phrenic Motor Neurons

Functional and Morphological Assessment of Diaphragm Innervation by Phrenic Motor Neurons

Published on: May 25, 2015

Small-Molecule Targeting MuRF1 Protects Against Denervation-Induced Diaphragmatic Dysfunction: Underlying Molecular

Fernando Ribeiro¹, Paulo R Jannig², Siegfried Labeit^3,4

¹Department of Anatomy, Institute of Biomedical Sciences, University of São Paulo, São Paulo, Brazil.

Journal of Cachexia, Sarcopenia and Muscle

|November 17, 2025

Summary

This summary is machine-generated.

A novel small-molecule, MyoMed-205, effectively prevents diaphragm muscle atrophy and dysfunction following unilateral diaphragm denervation. This compound supports muscle integrity and growth pathways while reducing detrimental fat deposition and fibrosis.

Keywords:

MyoMed‐205 PI3K‐Akt–mTOR pathway TRIM63 mechanical unloading skeletal muscle ubiquitin‐proteasome system unilateral diaphragm denervation

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Area of Science:

Muscle physiology
Biochemistry
Molecular biology

Background:

Mechanical inactivity causes diaphragm muscle dysfunction and atrophy, increasing morbidity and mortality risks.
Muscle RING-finger protein-1 (MuRF1) is upregulated during inactivity and targets muscle proteins for degradation.
Previous studies showed MyoMed-205 protects diaphragm from dysfunction after 12h of unilateral diaphragm denervation (UDD).

Purpose of the Study:

To investigate the mechanisms by which MyoMed-205 protects diaphragm structure and function during early UDD.
To elucidate the molecular pathways modulated by MyoMed-205 in response to denervation-induced muscle atrophy.

Main Methods:

Rats underwent UDD for 12 hours, followed by administration of MyoMed-205 or placebo.
Diaphragm tissues were analyzed using histology, morphometry, RNA-seq, and Western blot.
Sham-operated controls were used for comparison.

Main Results:

UDD induced atrophy in slow (Type I) and fast-twitch (Type IIa, IIb/x) diaphragm fibers, which MyoMed-205 prevented.
MyoMed-205 enhanced pathways for sarcomere integrity, calcium handling, antioxidant defense, and muscle growth.
MyoMed-205 mitigated UDD-induced intramuscular fat deposition and pro-fibrotic responses.

Conclusions:

MyoMed-205 protects against diaphragm muscle dysfunction and atrophy after 12h UDD.
The protective effect involves activating pathways for muscle structure, function, and growth.
MyoMed-205 mitigates fat deposition and fibrosis at transcriptional and protein levels.