The Ubiquitin-Proteasome System Is Indispensable for the Maintenance of Muscle Stem Cells

Yasuo Kitajima, Naoki Suzuki, Aki Nunomiya, Shion Osana, Kiyoshi Yoshioka, Yoshitaka Tashiro, Ryosuke Takahashi, Yusuke Ono, Masashi Aoki, Ryoichi Nagatomi

Research output: Contribution to journalArticlepeer-review

27 Citations (Scopus)

Abstract

Adult muscle stem cells (satellite cells) are required for adult skeletal muscle regeneration. A proper balance between quiescence, proliferation, and differentiation is essential for the maintenance of the satellite cell pool and their regenerative function. Although the ubiquitin-proteasome is required for most protein degradation in mammalian cells, how its dysfunction affects tissue stem cells remains unclear. Here, we investigated the function of the proteasome in satellite cells using mice lacking the crucial proteasomal component, Rpt3. Ablation of Rpt3 in satellite cells decreased proteasome activity. Proteasome dysfunction in Rpt3-deficient satellite cells impaired their ability to proliferate, survive and differentiate, resulting in defective muscle regeneration. We found that inactivation of proteasomal activity induced proliferation defects and apoptosis in satellite cells. Mechanistically, insufficient proteasomal activity upregulated the p53 pathway, which caused cell-cycle arrest. Our findings delineate a critical function of the proteasome system in maintaining satellite cells in adult muscle.

Original languageEnglish
Pages (from-to)1523-1538
Number of pages16
JournalStem Cell Reports
Volume11
Issue number6
DOIs
Publication statusPublished - 2018 Dec 11

Keywords

  • Rpt3
  • differentiation defect
  • muscle regeneration
  • muscle satellite cells
  • muscle stem cells
  • p53
  • proliferation defect
  • proteasome dysfunction
  • proteolysis
  • skeletal muscle

ASJC Scopus subject areas

  • Biochemistry
  • Genetics
  • Developmental Biology
  • Cell Biology

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