Cited by 218Muscle Physiology and DisordersTGF-β signaling in diseasesMuscle metabolism and nutrition

Follistatin-mediated skeletal muscle hypertrophy is regulated by Smad3 and mTOR independently of myostatin

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Winbanks, Catherine E., Weeks, Kate L., Thomson, Rachel E., Sepulveda, Patricio V., Beyer, Claudia, Qian, Hongwei, Chen, Justin L., Allen, James M. +6 more·2012·Journal of Cell Biology

Abstract

Follistatin is essential for skeletal muscle development and growth, but the intracellular signaling networks that regulate follistatin-mediated effects are not well defined. We show here that the administration of an adeno-associated viral vector expressing follistatin-288aa (rAAV6:Fst-288) markedly increased muscle mass and force-producing capacity concomitant with increased protein synthesis and mammalian target of rapamycin (mTOR) activation. These effects were attenuated by inhibition of mTOR or deletion of S6K1/2. Furthermore, we identify Smad3 as the critical intracellular link that mediates the effects of follistatin on mTOR signaling. Expression of constitutively active Smad3 not only markedly prevented skeletal muscle growth induced by follistatin but also potently suppressed follistatin-induced Akt/mTOR/S6K signaling. Importantly, the regulation of Smad3- and mTOR-dependent events by follistatin occurred independently of overexpression or knockout of myostatin, a key repressor of muscle development that can regulate Smad3 and mTOR signaling and that is itself inhibited by follistatin. These findings identify a critical role of Smad3/Akt/mTOR/S6K/S6RP signaling in follistatin-mediated muscle growth that operates independently of myostatin-driven mechanisms.

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Crossref · 10.1083/jcb.201109091

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  • Rapamycin treatment or mTOR knockdown reverts the hypertrophic effect of myostatin blockade, indicating cross-talk between myostatin and the AKT/mTOR axis.

    “Indeed, rapamycin treatment or mTOR knockdown revert the hypertrophic effect of myostatin blockade17,18.”
  • Inhibition of Smad2/3 is sufficient to promote muscle growth, suggesting that genes involved in protein turnover are targets of these transcription factors.

    “Importantly, just inhibition of Smad2/3 is sufficient to promote muscle growth17,18, suggesting that genes involved in protein turnover are the target of these transcription factors.”

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Authors
Winbanks, C. E., Weeks, K. L., Thomson, R. E., Sepulveda, P. V., Beyer, C., Qian, H., Chen, J. L., Allen, J. M., Lancaster, G. I., Febbraio, M. A., Harrison, C. A., McMullen, J. R., Chamberlain, J. S., & Gregorevic, P.
Affiliations
  • Baker Heart and Diabetes Institute (AU)
  • University of Washington (US)
  • Prince Henry’s Institute of Medical Research, Victoria 3168, Australia 3
Corresponding author
Gregorevic, Paul
Venue
Journal of Cell Biology
Published
2012-06-18
Volume
197
Issue
7
Pages
997-1008
ISSN
  • 0021-9525 (ISSN-L)
  • 1540-8140
OpenAlex
W2154083884
Cited by
218
References
65
Citations by year
2026: 10 · 2025: 15 · 2024: 21 · 2023: 13 · 2022: 21 · 2021: 18 · 2020: 15 · 2019: 13 · 2018: 9 · 2017: 21 · 2016: 15 · 2015: 17 · 2014: 10 · 2013: 15 · 2012: 4
FWCI
5.91
Type
journal article
Language
en
Open access
Licence
cc-by-nc-sa
Locations
  • The Journal of Cell Biology (publishedVersion, cc-by-nc-sa)
  • Europe PMC (PubMed Central) (publishedVersion, cc-by-nc-sa)
  • PubMed Central (publishedVersion, cc-by-nc-sa)
  • PubMed (publishedVersion)
  • Minerva Access (University of Melbourne) (submittedVersion, cc-by-nc-sa)
Funders
National Institute on Aging (AG033610, R01AG033610)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Muscle Physiology and Disorders
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › TGF-β signaling in diseases
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cell Biology › Muscle metabolism and nutrition
Keywords
follistatin, skeletal muscle hypertrophy, Smad3, mTOR signaling, myostatin, ribosomal protein S6, muscle mass, muscle force production, adeno-associated virus vectors, muscle growth regulation
MeSH terms
Animals, Humans, Hypertrophy, Mice, Inbred C57BL, Signal Transduction, Muscle, Skeletal, Follistatin, Mice, Smad3 Protein, Myostatin, HEK293 Cells, TOR Serine-Threonine Kinases

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