Cited by 85Muscle Physiology and DisordersUbiquitin and proteasome pathwaysHeat shock proteins research

The p97/VCP ATPase is critical in muscle atrophy and the accelerated degradation of muscle proteins

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Piccirillo, Rosanna, Goldberg, Alfred L·2012·The EMBO Journal

Abstract

The p97/VCP ATPase complex facilitates the extraction and degradation of ubiquitinated proteins from larger structures. We therefore studied if p97 participates to the rapid degradation of myofibrillar proteins during muscle atrophy. Electroporation of a dominant negative p97 (DNp97), but not the WT, into mouse muscle reduced fibre atrophy caused by denervation and food deprivation. DNp97 (acting as a substrate-trap) became associated with specific myofibrillar proteins and its cofactors, Ufd1 and p47, and caused accumulation of ubiquitinated components of thin and thick filaments, which suggests a role for p97 in extracting ubiquitinated proteins from myofibrils. DNp97 expression in myotubes reduced overall proteolysis by proteasomes and lysosomes and blocked the accelerated proteolysis induced by FoxO3, which is essential for atrophy. Expression of p97, Ufd1 and p47 increases following denervation, at times when myofibrils are rapidly degraded. Surprisingly, p97 inhibition, though toxic to most cells, caused rapid growth of myotubes (without enhancing protein synthesis) and hypertrophy of adult muscles. Thus, p97 restrains post-natal muscle growth, and during atrophy, is essential for the accelerated degradation of most muscle proteins.

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Crossref · 10.1038/emboj.2012.178

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  • The p97/VCP ATPase complex extracts and degrades ubiquitinated proteins from larger structures including myofibrils, is induced during denervation, and overexpression of a dominant-negative p97/VCP reduces overall proteolysis by the proteasome and lysosome pathways.

    “Finally, another player is the p97/valosin-containing protein (VCP) ATPase complex whose function is to extract and degrade ubiquitinated proteins from larger structures, including myofibrils60. p97/VCP is induced during denervation, and overexpression of a dominant-negative p97/VCP reduces overall proteolysis by the proteasome and lysosome pathways.”
  • In skeletal muscle, p97/VCP is critical in extracting ubiquitinated proteins from myofibrils during fasting- and denervation-induced atrophy.

    “In skeletal muscle, p97/VCP is critical in extracting ubiquitinated proteins from myofibrils during fasting- and denervation-induced atrophy.”
  • During muscle atrophy, induction of p97/VCP occurs when protein breakdown is maximal in myofibers.

    “Interestingly, during muscle atrophy, induction of p97/VCP occurs when protein breakdown is maximal in myofibers [177].”

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Authors
Piccirillo, R., & Goldberg, A. L.
Affiliations
Harvard University (US)
Corresponding author
Goldberg, Alfred L
Venue
The EMBO Journal
Published
2012-07-06
Volume
31
Issue
15
Pages
3334-3350
ISSN
  • 0261-4189 (ISSN-L)
  • 1460-2075
OpenAlex
W1828817591
Cited by
85
References
77
Citations by year
2026: 4 · 2025: 1 · 2024: 7 · 2023: 5 · 2022: 8 · 2021: 9 · 2020: 8 · 2019: 4 · 2018: 7 · 2017: 4 · 2016: 7 · 2015: 4 · 2014: 5 · 2013: 12
FWCI
2.70
Type
journal article
Language
en
Open access
Locations
  • The EMBO Journal (publishedVersion)
  • Europe PMC (PubMed Central) (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • Muscular Dystrophy Association
  • National Institutes of Health
  • Takeda Oncology
  • National Institute of Arthritis and Musculoskeletal and Skin Diseases (AR055255, R01AR055255)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Muscle Physiology and Disorders
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Ubiquitin and proteasome pathways
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Heat shock proteins research
Keywords
muscle atrophy, myofibrillar protein degradation, ubiquitinated proteins, denervation, food deprivation, FOXO3, proteasome, lysosomes, Ufd1, p47phox, muscle hypertrophy, myotubes
MeSH terms
Acceleration, Valosin Containing Protein, Adenosine Triphosphatases, Animals, Cells, Cultured, Fasting, Male, Mice, Transgenic, Muscle Denervation, Muscle Proteins, Muscular Atrophy, Muscle, Skeletal, Muscle Fibers, Skeletal, Cell Cycle Proteins, Mutant Proteins, Mice, Proteolysis

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