Cited by 119Muscle Physiology and DisordersMuscle metabolism and nutritionTGF-β signaling in diseases

JNK regulates muscle remodeling via myostatin/SMAD inhibition

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Lessard, Sarah J., MacDonald, Tara L., Pathak, Prerana, Han, Myoung Sook, Coffey, Vernon G., Edge, Johann, Rivas, Donato A., Hirshman, Michael F. +2 more·2018·Nature Communications

Abstract

Skeletal muscle has a remarkable plasticity to adapt and remodel in response to environmental cues, such as physical exercise. Endurance exercise stimulates improvements in muscle oxidative capacity, while resistance exercise induces muscle growth. Here we show that the c-Jun N-terminal kinase (JNK) is a molecular switch that when active, stimulates muscle fibers to grow, resulting in increased muscle mass. Conversely, when muscle JNK activation is suppressed, an alternative remodeling program is initiated, resulting in smaller, more oxidative muscle fibers, and enhanced aerobic fitness. When muscle is exposed to mechanical stress, JNK initiates muscle growth via phosphorylation of the transcription factor, SMAD2, at specific linker region residues leading to inhibition of the growth suppressor, myostatin. In human skeletal muscle, this JNK/SMAD signaling axis is activated by resistance exercise, but not endurance exercise. We conclude that JNK acts as a key mediator of muscle remodeling during exercise via regulation of myostatin/SMAD signaling.

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Crossref · 10.1038/s41467-018-05439-3

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  • Mechanistic insights from cell and animal studies suggest that when muscle is subjected to mechanical stress, it can downregulate myostatin expression via pathways such as JNK-mediated phosphorylation of transcription factor Smad2.

    “Mechanistic insights from cell and animal studies suggest that when muscle is subjected to mechanical stress, it can downregulate MSTN expression via pathways such as JNK-mediated phosphorylation of transcription factor Smad2 [55,57].”

    From Exercise-Induced Myokines in Obesity-Related Metabolic Disorders and Cardiovascular Protection: A Narrative Review (2026) · cites this paper as [57]

    The Results section on muscle JNK activation reports that mechanical stretch activated JNK and SMAD2 phosphorylation, and the Discussion links JNK-mediated SMAD2 phosphorylation to inhibition of myostatin activity. The source does not show that this pathway downregulates MSTN expression; in the Results section on myostatin activity in vivo, myostatin mRNA expression was similar in JNK-knockout and control mice. Page numbers were not available in our copy. (LLM, conf=0.88)

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  • Exercise downregulates myostatin expression, with the magnitude of reduction depending on exercise mode, duration, and intensity.

    “Exercise downregulates MSTN expression, with the magnitude of reduction depending on exercise mode, duration, and intensity.”

    From Exercise-Induced Myokines in Obesity-Related Metabolic Disorders and Cardiovascular Protection: A Narrative Review (2026) · cites this paper as [57]

    The Discussion (page unavailable) says resistance exercise inhibits myostatin activity through JNK/SMAD2 signaling more strongly than endurance exercise, supporting a difference by exercise mode. It does not show that exercise downregulates MSTN expression or that the magnitude of an expression reduction depends on duration or intensity. The Results section on JNK suppression (page unavailable) reports similar myostatin mRNA expression in the mouse groups it compared. (LLM, conf=0.86)

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Authors
Lessard, S. J., MacDonald, T. L., Pathak, P., Han, M. S., Coffey, V. G., Edge, J., Rivas, D. A., Hirshman, M. F., Davis, R. J., & Goodyear, L. J.
Affiliations
  • Brigham and Women's Hospital (US)
  • Joslin Diabetes Center (US)
  • University of Massachusetts Chan Medical School (US)
  • Bond University (AU)
  • Massey University (NZ)
  • Tufts University (US)
  • Howard Hughes Medical Institute (US)
Corresponding author
Lessard, Sarah J.
Venue
Nature Communications
Published
2018-08-02
Volume
9
Issue
1
Pages
3030-3030
ISSN
2041-1723 (ISSN-L)
OpenAlex
W2884155806
Cited by
119
References
57
Citations by year
2026: 10 · 2025: 14 · 2024: 16 · 2023: 14 · 2022: 17 · 2021: 14 · 2020: 21 · 2019: 12 · 2018: 1
FWCI
4.27
Type
journal article
Language
en
Open access
Locations
  • Nature Communications (publishedVersion, cc-by)
  • Europe PMC (PubMed Central) (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • eScholarship@UMassChan (submittedVersion, cc-by)
  • Bond University Research Portal (Bond University) (submittedVersion, cc-by)
  • RePEc: Research Papers in Economics (submittedVersion)
  • RMIT Research Repository (RMIT University Library) (submittedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
  • Figshare (submittedVersion, cc-by)
Funders
American Heart Association (15SDG25560057)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Muscle Physiology and Disorders
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cell Biology › Muscle metabolism and nutrition
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › TGF-β signaling in diseases
Keywords
c-Jun N-terminal kinase, skeletal muscle remodeling, myostatin, Smad2, resistance training, endurance exercise, muscle fiber growth, muscle oxidative capacity, cardiorespiratory fitness, mechanical stress, Smad2 phosphorylation, muscle mass
MeSH terms
Adult, Animals, Cell Nucleus, Enzyme Activation, Gene Expression Regulation, Humans, Hypertrophy, Mice, Inbred C57BL, Muscles, Phosphorylation, Physical Conditioning, Animal, Physical Endurance, Signal Transduction, Mice, Knockout, Muscle, Skeletal, Integrases, Protein Transport, Muscle Development, JNK Mitogen-Activated Protein Kinases, Smad Proteins, Myostatin, HEK293 Cells

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