Cited by 89Ubiquitin and proteasome pathwaysMuscle Physiology and DisordersCell death mechanisms and regulation

Caspase-3 cleaves specific 19 S proteasome subunits in skeletal muscle stimulating proteasome activity

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Wang, Xiaonan H., Zhang, Liping, Mitch, William E., LeDoux, Joseph M., Hu, Junping, Du, Jie·2010·Journal of Biological Chemistry

Abstract

With muscle wasting, caspase-3 activation and the ubiquitin-proteasome system act synergistically to increase the degradation of muscle proteins. Whether proteasome activity is also elevated in response to catabolic conditions is unknown. We find that caspase-3 increases proteasome activity in myotubes but not in myoblasts. This difference is related to the cleavage of specific 19 S proteasome subunits. In mouse muscle or myotubes, caspase-3 cleaves Rpt2 and Rpt6 increasing proteasome activity. In myoblasts, caspase-3 cleaves Rpt5 to decrease proteasome activity. To confirm the caspase-3 dependence, caspase-3 cleavage sites in Rpt2, Rpt6, or Rpt5 were mutated. This prevented the cleavage of these subunits by caspase-3 as well as the changes in proteasome activity. During differentiation of myoblasts to myotubes, there is an obligatory, transient increase in caspase-3 activity, accompanied by a corresponding increase in proteasome activity and cleavage of Rpt2 and Rpt6. Therefore, differentiation changes the proteasome type from sensitivity of Rpt5 to caspase-3 in myoblasts to sensitivity of Rpt2 and Rpt6 in myotubes. This novel mechanism identifies a feed-forward amplification that augments muscle proteolysis in catabolic conditions. Indeed, we found that in mice with a muscle wasting condition, chronic kidney disease, there was cleavage of subunits Rpt2 and Rpt6 and stimulation of proteasome activity.

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Crossref · 10.1074/jbc.m109.041707

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  • Alterations in mPTP function contribute to the aging-related loss of muscle mass and function.

    “Alterations in mPTP function are undoubtedly contributing to the aging-related loss of muscle mass and function, since mPTP opening can trigger several atrophy-regulating pathways.”

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Authors
Wang, X. H., Zhang, L., Mitch, W. E., LeDoux, J. M., Hu, J., & Du, J.
Affiliations
  • Emory University (US)
  • Baylor College of Medicine (US)
  • Georgia Institute of Technology (US)
Corresponding author
  • Wang, Xiaonan H.
  • Du, Jie
Venue
Journal of Biological Chemistry
Publisher
Elsevier BV
Published
2010-07
Volume
285
Issue
28
Pages
21249-21257
ISSN
0021-9258 (ISSN-L)
OpenAlex
W1980613381
Cited by
89
References
45
Citations by year
2026: 3 · 2025: 3 · 2024: 4 · 2023: 2 · 2022: 5 · 2021: 6 · 2020: 3 · 2019: 5 · 2018: 4 · 2017: 5 · 2016: 5 · 2015: 8 · 2014: 8 · 2013: 9 · 2012: 10
FWCI
3.62
Type
journal article
Language
en
Open access
Locations
  • Journal of Biological Chemistry (publishedVersion, cc-by)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • Emory University
  • National Institutes of Health
  • National Heart, Lung, and Blood Institute (R01HL070762)
  • National Institute of Diabetes and Digestive and Kidney Diseases (P50DK064233, R37DK037175)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Ubiquitin and proteasome pathways
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Muscle Physiology and Disorders
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Cell death mechanisms and regulation
Keywords
caspase-3, 19S proteasome, proteasome activity, Rpt2, Rpt6, myotubes, myogenesis, muscle atrophy, ubiquitin-proteasome system, muscle protein degradation, chronic kidney disease
MeSH terms
Adenosine Triphosphate, Animals, Humans, Models, Biological, Mutation, Peptide Hydrolases, RNA, Ribosomal, Gene Expression Regulation, Enzymologic, Protein Structure, Tertiary, Muscle, Skeletal, Jurkat Cells, Caspases, Proteasome Endopeptidase Complex, Mice, Caspase 3

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