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MEK-inhibitors decrease Nfix in muscular dystrophy but induce unexpected calcifications, partially rescued with

Giuseppe Angelini1, Emanuele Capra1, Francesca Rossi1

  • 1Department of Biosciences, University of Milan, 20133 Milan, Italy.

Iscience
|January 11, 2024
PubMed
Summary
This summary is machine-generated.

This study investigated Trametinib and Cyanidin for muscular dystrophy (MD). Cyanidin mitigated unexpected calcifications caused by Trametinib, offering a potential synergistic therapeutic approach for MD.

Keywords:
CancerDrugsPathophysiology

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Area of Science:

  • Muscle biology
  • Genetic disorders
  • Pharmacology

Background:

  • Muscular dystrophies (MDs) are incurable genetic myopathies causing progressive skeletal muscle degeneration.
  • Mice lacking the Nfix transcription factor show improved disease phenotypes.
  • The MAPK signaling pathway regulates Nfix, and the antioxidant Cyanidin ameliorates MD pathology.

Purpose of the Study:

  • To explore a synergistic therapeutic approach for MDs using Trametinib (MEK inhibitor) and Cyanidin.
  • To investigate the effects of combined treatment on Nfix modulation and disease pathology in Sgca null mice.

Main Methods:

  • Adult Sgca null mice were treated with Trametinib alone or in combination with Cyanidin.
  • Nfix levels in myogenic cells were assessed.
  • Histological analysis was performed to evaluate ectopic calcifications and muscle improvements.

Main Results:

  • Chronic Trametinib and Cyanidin treatment reduced Nfix in myogenic cells.
  • Unexpected ectopic calcifications occurred exclusively in dystrophic muscles.
  • Combined Cyanidin treatment prevented Trametinib-induced calcifications in diaphragm and soleus muscles, showing histological improvements.

Conclusions:

  • Nfix is modulated by the MAPK pathway in muscular dystrophies.
  • Cyanidin partially rescued ectopic calcifications induced by MEK inhibition.
  • This study provides a foundation for synergistic therapeutic strategies in MDs.