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Loss of endogenous estrogen alters mitochondrial metabolism and muscle clock‐related protein Rbm20 in female mdx mice

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posted on 2024-07-05, 06:08 authored by Cara A Timpani, Didier Debrincat, Stephanie Kourakis, Rebecca Boyer, Luke E Formosa, Joel R Steele, Haijian Zhang, Ralf B Schittenhelm, Aaron RussellAaron Russell, Emma Rybalka, Angus Lindsay
AbstractFemale carriers of a Duchenne muscular dystrophy (DMD) gene mutation manifest exercise intolerance and metabolic anomalies that may be exacerbated following menopause due to the loss of estrogen, a known regulator of skeletal muscle function and metabolism. Here, we studied the impact of estrogen depletion (via ovariectomy) on exercise tolerance and muscle mitochondrial metabolism in female mdx mice and the potential of estrogen replacement therapy (using estradiol) to protect against functional and metabolic perturbations. We also investigated the effect of estrogen depletion, and replacement, on the skeletal muscle proteome through an untargeted proteomic approach with TMT‐labelling. Our study confirms that loss of estrogen in female mdx mice reduces exercise capacity, tricarboxylic acid cycle intermediates, and citrate synthase activity but that these deficits are offset through estrogen replacement therapy. Furthermore, ovariectomy downregulated protein expression of RNA‐binding motif factor 20 (Rbm20), a critical regulator of sarcomeric and muscle homeostasis gene splicing, which impacted pathways involving ribosomal and mitochondrial translation. Estrogen replacement modulated Rbm20 protein expression and promoted metabolic processes and the upregulation of proteins involved in mitochondrial dynamics and metabolism. Our data suggest that estrogen mitigates dystrophinopathic features in female mdx mice and that estrogen replacement may be a potential therapy for post‐menopausal DMD carriers.

History

Journal

The FASEB Journal

Volume

38

Article number

e23718

Pagination

1-19

Location

London, Eng.

Open access

  • Yes

ISSN

0892-6638

eISSN

1530-6860

Language

eng

Publication classification

C1 Refereed article in a scholarly journal

Issue

11

Publisher

Wiley