Estrogen receptor-α in female skeletal muscle is not required for regulation of muscle insulin sensitivity and mitochondrial regulation

Melissa R. Iñigo, Adam J. Amorese, Michael D. Tarpey, Nicholas P. Balestrieri, Keith G. Jones, Daniel J. Patteson, Kathryn C. Jackson, Maria J. Torres, Chien Te Lin, Cody D. Smith, Timothy D. Heden, Shawna L. McMillin, Luke A. Weyrauch, Erin C. Stanley, Cameron A. Schmidt, Brita B. Kilburg-Basnyat, Sky W. Reece, Christine E. Psaltis, Leslie A. Leinwand, Katsu FunaiJoseph M. McClung, Kymberly M. Gowdy, Carol A. Witczak, Dawn A. Lowe, P. Darrell Neufer, Espen E. Spangenburg

Research output: Contribution to journalArticlepeer-review

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Abstract

Objective: Estrogen receptor-α (ERα) is a nuclear receptor family member thought to substantially contribute to the metabolic regulation of skeletal muscle. However, previous mouse models utilized to assess the necessity of ERα signaling in skeletal muscle were confounded by altered developmental programming and/or influenced by secondary effects, making it difficult to assign a causal role for ERα. The objective of this study was to determine the role of skeletal muscle ERα in regulating metabolism in the absence of confounding factors of development. Methods: A novel mouse model was developed allowing for induced deletion of ERα in adult female skeletal muscle (ERαKOism). ERαshRNA was also used to knockdown ERα (ERαKD) in human myotubes cultured from primary human skeletal muscle cells isolated from muscle biopsies from healthy and obese insulin-resistant women. Results: Twelve weeks of HFD exposure had no differential effects on body composition, VO2, VCO2, RER, energy expenditure, and activity counts across genotypes. Although ERαKOism mice exhibited greater glucose intolerance than wild-type (WT) mice after chronic HFD, ex vivo skeletal muscle glucose uptake was not impaired in the ERαKOism mice. Expression of pro-inflammatory genes was altered in the skeletal muscle of the ERαKOism, but the concentrations of these inflammatory markers in the systemic circulation were either lower or remained similar to the WT mice. Finally, skeletal muscle mitochondrial respiratory capacity, oxidative phosphorylation efficiency, and H2O2 emission potential was not affected in the ERαKOism mice. ERαKD in human skeletal muscle cells neither altered differentiation capacity nor caused severe deficits in mitochondrial respiratory capacity. Conclusions: Collectively, these results suggest that ERα function is superfluous in protecting against HFD-induced skeletal muscle metabolic derangements after postnatal development is complete.

Original languageEnglish (US)
Pages (from-to)1-15
Number of pages15
JournalMolecular Metabolism
Volume34
DOIs
StatePublished - Apr 2020

Bibliographical note

Funding Information:
This study was supported by grant funding from ADA 1-15-BS-170 (E.E.S.), NIH RO1AR066660 (E.E.S.), NIH RO1HL125695 (J.M.M.), NIH RO1DK107397 (K.F.), NIH RO3DK109888 (K.F.), F32DK109556 (T.D.H.), NIH RO1AG031743 (D.A.L.), NIH RO1DK096907 (P.D.N.), NIH RO1DK103562 (C.A.W.), and NIH RO1GM29090 (L.A.L.).

Keywords

  • Estrogen receptor-alpha
  • Inflammation
  • Insulin sensitivity
  • Metabolism
  • Mitochondrial function
  • Skeletal muscle

PubMed: MeSH publication types

  • Journal Article
  • Research Support, N.I.H., Extramural
  • Research Support, Non-U.S. Gov't

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