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Restriction of protein synthesis abolishes senescence features at cellular and organismal levels

Yuki Takauji1, Takumi Wada1, Asuka Takeda1

  • 1Graduate School of Nanobioscience, Yokohama City University, 22-2 Seto, Kanazawa-ku, Yokohama, Kanagawa 236-0027, Japan.

Scientific Reports
|January 6, 2016
PubMed

Insights

Mild restriction of cytoplasmic protein synthesis prevents cellular senescence, a key aging process. This finding in human cells and C. elegans worms suggests protein accumulation drives senescence and impacts lifespan.

Area of Science:

  • Cellular and Molecular Biology
  • Aging Research
  • Biochemistry

Background:

  • Cellular senescence is a state of irreversible growth arrest.
  • Senescence can be induced by various stressors and is linked to aging.
  • The precise molecular mechanisms driving senescence remain under investigation.

Purpose of the Study:

  • To investigate the role of cytoplasmic protein synthesis in cellular senescence.
  • To determine if modulating protein synthesis can prevent or reverse senescence.
  • To explore the impact of protein synthesis restriction on lifespan in a model organism.

Main Methods:

  • Treatment of normal and tumor-derived human cells with senescence inducers.
  • Mild restriction of cytoplasmic protein synthesis.
  • Observation of cellular growth and senescence markers.
  • Lifespan analysis of Caenorhabditis elegans (C. elegans) under protein restriction.

Main Results:

  • Mild restriction of cytoplasmic protein synthesis prevented the induction of senescence in human cells.
  • Restricted cells continued to grow without senescent features, even with inducers.
  • Replicative senescence was delayed in normal human fibroblasts.
  • Senescent cells resumed growth when protein synthesis was restricted.
  • Protein restriction significantly extended the average and maximal lifespans of C. elegans.

Conclusions:

  • Imbalance in macromolecule synthesis, leading to cytoplasmic protein accumulation, is a fundamental cause of cellular senescence.
  • Modulating cytoplasmic protein synthesis offers a potential strategy to control cellular senescence and extend lifespan.

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