Cited by 51Muscle Physiology and DisordersTGF-β signaling in diseasesNutrition and Health in Aging

Integrated expression analysis of muscle hypertrophy identifies Asb2 as a negative regulator of muscle mass

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Davey, Jonathan R., Watt, Kevin I., Parker, Benjamin L., Chaudhuri, Rima, Ryall, James G., Cunningham, Louise, Qian, Hongwei, Sartorelli, Vittorio +4 more·2016·JCI Insight

Abstract

The transforming growth factor-β (TGF-β) signaling network is a critical regulator of skeletal muscle mass and function and, thus, is an attractive therapeutic target for combating muscle disease, but the underlying mechanisms of action remain undetermined. We report that follistatin-based interventions (which modulate TGF-β network activity) can promote muscle hypertrophy that ameliorates aging-associated muscle wasting. However, the muscles of old sarcopenic mice demonstrate reduced response to follistatin compared with healthy young-adult musculature. Quantitative proteomic and transcriptomic analyses of young-adult muscles identified a transcription/translation signature elicited by follistatin exposure, which included repression of ankyrin repeat and SOCS box protein 2 ( Asb2 ). Increasing expression of ASB2 reduced muscle mass, thereby demonstrating that Asb2 is a TGF-β network–responsive negative regulator of muscle mass. In contrast to young-adult muscles, sarcopenic muscles do not exhibit reduced ASB2 abundance with follistatin exposure. Moreover, preventing repression of ASB2 in young-adult muscles diminished follistatin-induced muscle hypertrophy. These findings provide insight into the program of transcription and translation events governing follistatin-mediated adaptation of skeletal muscle attributes and identify Asb2 as a regulator of muscle mass implicated in the potential mechanistic dysfunction between follistatin-mediated muscle growth in young and old muscles.

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Crossref · 10.1172/jci.insight.85477

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  • Follistatin-mediated hypertrophy not only blocks myostatin signaling but simultaneously stimulates Smad1/5/8 activation.

    “Consistently, follistatin-mediated hypertrophy not only blocks myostatin signaling but simultaneously stimulates Smad1/5/8 activation19,22,23.”
  • Asb2b is a muscle-specific ubiquitin ligase repressed by Follistatin and critical for hypertrophy; its inhibition is permissive for growth, while its overexpression causes muscle atrophy.

    “An exception is the muscle-specific ubiquitin ligase, SOCS box protein 2 (Asb2b)22, which was identified to be repressed by Follistatin and to be critical for hypertrophy. In fact, while its inhibition is permissive for growth, its overexpression causes muscle atrophy22.”

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Authors
Davey, J. R., Watt, K. I., Parker, B. L., Chaudhuri, R., Ryall, J. G., Cunningham, L., Qian, H., Sartorelli, V., Sandri, M., Chamberlain, J., James, D. E., & Gregorevic, P.
Affiliations
  • Baker Heart and Diabetes Institute (AU)
  • The University of Sydney (AU)
  • National Institutes of Health (US)
  • University of Padua (IT)
  • University of Washington (US)
Corresponding author
Gregorevic, Paul
Venue
JCI Insight
Published
2016-04-21
Volume
1
Issue
5
ISSN
2379-3708 (ISSN-L)
OpenAlex
W2336035698
Cited by
51
References
55
Citations by year
2026: 1 · 2025: 5 · 2024: 9 · 2023: 2 · 2022: 2 · 2021: 11 · 2020: 5 · 2019: 7 · 2018: 4 · 2017: 4 · 2016: 1
FWCI
2.77
Type
journal article
Language
en
Open access
Locations
  • JCI Insight (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
  • Monash University Research Portal (Monash University) (submittedVersion, other-oa)
  • Padua Research Archive (University of Padova) (submittedVersion)
Funders
  • University of Washington
  • State Government of Victoria
  • National Institutes of Health
  • Medical Research Council
  • National Health and Medical Research Council (1046782, 526648)
  • National Institute on Aging (R01AG033610)
  • National Institute of Arthritis and Musculoskeletal and Skin Diseases (U54AR065139, R01AR044533)
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
  • Health Sciences › Medicine › Physiology › Nutrition and Health in Aging
Keywords
ASB2, follistatin, muscle hypertrophy, skeletal muscle mass, TGF-beta signaling, sarcopenia, aging, muscle atrophy, transcriptional repression, translational regulation, proteomics, transcriptomics, negative regulator

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