Cited by 229Muscle Physiology and DisordersNutrition and Health in AgingMuscle metabolism and nutrition

The DOI matches its Crossref record; 51 of the 52 references it cites were found in a registry or an index.

Inhibition of Stat3 Activation Suppresses Caspase-3 and the Ubiquitin-Proteasome System, Leading to Preservation of Muscle Mass in Cancer Cachexia

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Abstract

Cachexia occurs in patients with advanced cancers. Despite the adverse clinical impact of cancer-induced muscle wasting, pathways causing cachexia are controversial, and clinically reliable therapies are not available. A trigger of muscle protein loss is the Jak/Stat pathway, and indeed, we found that conditioned medium from C26 colon carcinoma (C26) or Lewis lung carcinoma cells activates Stat3 (p-Stat3) in C2C12 myotubes. We identified two proteolytic pathways that are activated in muscle by p-Stat3; one is activation of caspase-3, and the other is p-Stat3 to myostatin, MAFbx/Atrogin-1, and MuRF-1 via CAAT/enhancer-binding protein δ (C/EBPδ). Using sequential deletions of the caspase-3 promoter and CHIP assays, we determined that Stat3 activation increases caspase-3 expression in C2C12 cells. Caspase-3 expression and proteolytic activity were stimulated by p-Stat3 in muscles of tumor-bearing mice. In mice with cachexia caused by Lewis lung carcinoma or C26 tumors, knock-out of p-Stat3 in muscle or with a small chemical inhibitor of p-Stat3 suppressed muscle mass losses, improved protein synthesis and degradation in muscle, and increased body weight and grip strength. Activation of p-Stat3 stimulates a pathway from C/EBPδ to myostatin and expression of MAFbx/Atrogin-1 and increases the ubiquitin-proteasome system. Indeed, C/EBPδ KO decreases the expression of MAFbx/Atrogin-1 and myostatin, while increasing muscle mass and grip strength. In conclusion, cancer stimulates p-Stat3 in muscle, activating protein loss by stimulating caspase-3, myostatin, and the ubiquitin-proteasome system. These results could lead to novel strategies for preventing cancer-induced muscle wasting.

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Metadata

Authors
Silva, K. A. S., Dong, J., Dong, Y., Dong, Y., Schor, N., Tweardy, D. J., Zhang, L., & Mitch, W. E.
Affiliations
  • Universidade Federal de São Paulo (BR)
  • Sichuan University (CN)
  • Capital Medical University (CN)
  • Baylor College of Medicine (US)
Corresponding author
Zhang, Liping
Venue
Journal of Biological Chemistry
Publisher
Elsevier BV
Published
2015-04
Volume
290
Issue
17
Pages
11177-11187
ISSN
0021-9258 (ISSN-L)
OpenAlex
W2011567765
Cited by
229
References
52
Citations by year
2026: 9 · 2025: 18 · 2024: 20 · 2023: 23 · 2022: 35 · 2021: 25 · 2020: 27 · 2019: 17 · 2018: 17 · 2017: 16 · 2016: 16 · 2015: 4
FWCI
7.67
Type
journal article
Language
en
Open access
Locations
  • Journal of Biological Chemistry (publishedVersion, cc-by)
  • Europe PMC (PubMed Central) (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
  • UNIFESP Institutional Repository (Universidade Federal de São Paulo) (submittedVersion)
Funders
National Institutes of Health (R37 DK37175, P50 CA058183, P50 CA097007, R21 CA149783)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Muscle Physiology and Disorders
  • Health Sciences › Medicine › Physiology (medical) › Nutrition and Health in Aging
  • Health Sciences › Nursing › Nutrition and Dietetics › Muscle metabolism and nutrition
Keywords
cancer cachexia, STAT3 activation, caspase-3, ubiquitin-proteasome system, C/EBPδ, myostatin, atrogin-1/MAFbx, MuRF1, muscle protein degradation, muscle mass preservation, JAK/STAT signaling, Lewis lung carcinoma, C26 colon carcinoma, muscle protein synthesis
MeSH terms
Tripartite Motif Proteins, Animals, Cachexia, Colonic Neoplasms, Muscle Proteins, Mice, Knockout, Muscle, Skeletal, Carcinoma, Lewis Lung, Ubiquitin, Ubiquitin-Protein Ligases, SKP Cullin F-Box Protein Ligases, Cell Line, Tumor, Proteasome Endopeptidase Complex, STAT3 Transcription Factor, Mice, CCAAT-Enhancer-Binding Protein-delta, Caspase 3, Myostatin, Proteolysis

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