Cited by 171Muscle Physiology and DisordersUbiquitin and proteasome pathwaysMuscle metabolism and nutrition

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The ubiquitin–proteasome system in regulation of the skeletal muscle homeostasis and atrophy: from basic science to disorders

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Kitajima, Yasuo, Yoshioka, Kiyoshi, Suzuki, Naoki·2020·The Journal of Physiological Sciences

Abstract

Skeletal muscle is one of the most abundant and highly plastic tissues. The ubiquitin-proteasome system (UPS) is recognised as a major intracellular protein degradation system, and its function is important for muscle homeostasis and health. Although UPS plays an essential role in protein degradation during muscle atrophy, leading to the loss of muscle mass and strength, its deficit negatively impacts muscle homeostasis and leads to the occurrence of several pathological phenotypes. A growing number of studies have linked UPS impairment not only to matured muscle fibre degeneration and weakness, but also to muscle stem cells and deficiency in regeneration. Emerging evidence suggests possible links between abnormal UPS regulation and several types of muscle diseases. Therefore, understanding of the role of UPS in skeletal muscle may provide novel therapeutic insights to counteract muscle wasting, and various muscle diseases. In this review, we focussed on the role of proteasomes in skeletal muscle and its regeneration, including a brief explanation of the structure of proteasomes. In addition, we summarised the recent findings on several diseases and elaborated on how the UPS is related to their pathological states.

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Crossref · 10.1186/s12576-020-00768-9

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Fig. 1 The 26S proteasome is composed of one proteolytically active cylinder-shaped particle (the 20S proteasome) and ATPase-containing complexes (the 19S cap complexes). The 19S cap complex unfolds ubiquitin-conjugated proteins to allow their entry into the 20S cylindrical particle. The 19S regulatory particles on the ends of the 20S proteasome are composed of at least 18 subunits. The base contains the two largest subunits of the proteasome, Rpn1 and Rpn2, the ubiquitin receptor Rpn10 and Rpn13, and the six ATPases, Rpt1-Rpt6. 19S RP, 19S regulatory particle. 20S CP, 20S core particle
Fig. 1 The 26S proteasome is composed of one proteolytically active cylinder-shaped particle (the 20S proteasome) and ATPase-containing complexes (the 19S cap complexes). The 19S cap complex unfolds ubiquitin-conjugated proteins to allow their entry into the 20S cylindrical particle. The 19S regulatory particles on the ends of the 20S proteasome are composed of at least 18 subunits. The base contains the two largest subunits of the proteasome, Rpn1 and Rpn2, the ubiquitin receptor Rpn10 and Rpn13, and the six ATPases, Rpt1-Rpt6. 19S RP, 19S regulatory particle. 20S CP, 20S core particleCC BY · PubMed Central
Fig. 2 Proteasome dysfunction in Rpt3-deficient muscle stem cells impaired their ability to proliferate, survive and differentiate, resulting in defective muscle regeneration. We also found that proteasome inactivation by Rpt3 deficiency in primary myoblasts inhibits cell proliferation and induces apoptosis. Further, proteasome dysfunction conferred by satellite cell-specific Rpt3-knockout induces p53 activation
Fig. 2 Proteasome dysfunction in Rpt3-deficient muscle stem cells impaired their ability to proliferate, survive and differentiate, resulting in defective muscle regeneration. We also found that proteasome inactivation by Rpt3 deficiency in primary myoblasts inhibits cell proliferation and induces apoptosis. Further, proteasome dysfunction conferred by satellite cell-specific Rpt3-knockout induces p53 activationCC BY · PubMed Central

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Metadata

Authors
Kitajima, Y., Yoshioka, K., & Suzuki, N.
Affiliations
  • Institute of Molecular Embryology and Genetics, Kumamoto University (JP)
  • Tohoku University (JP)
Corresponding author
  • Kitajima, Yasuo
  • Suzuki, Naoki
Venue
The Journal of Physiological Sciences
Publisher
Elsevier BV
Published
2020
Volume
70
Issue
1
Pages
40
ISSN
1880-6546 (ISSN-L)
OpenAlex
W3085918938
Cited by
171
References
145
Citations by year
2026: 28 · 2025: 43 · 2024: 33 · 2023: 25 · 2022: 30 · 2021: 12
FWCI
1.60
Type
journal article
Language
en
Open access
Locations
  • The Journal of Physiological Sciences (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
Funders
  • Takeda Science Foundation
  • Grant-in-Aid for Scientific Research KAKENHI (15H05667, 16H05318, 18K07519, 18K17857, 20H04078)
  • Suzuken Memorial Foundation (YK)
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
  • Health Sciences › Nursing › Nutrition and Dietetics › Muscle metabolism and nutrition
Keywords
ubiquitin-proteasome system, skeletal muscle homeostasis, muscle atrophy, proteasome, muscle regeneration, muscle stem cells, muscle fiber degeneration, myopathy, protein degradation
MeSH terms
Animals, Homeostasis, Humans, Muscle Proteins, Muscular Atrophy, Regeneration, Muscle, Skeletal, Muscle Development, Ubiquitin, Satellite Cells, Skeletal Muscle, Proteasome Endopeptidase Complex, Ubiquitination, Proteolysis

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