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Rapamycin and the inhibition of the secretory phenotype

Rong Wang1, Bharath Sunchu2, Viviana I Perez3

  • 1Linus Pauling Institute, Oregon State University, Corvallis, OR 97331, United States.

Experimental Gerontology
|February 8, 2017
PubMed

Insights

Selective removal of senescent cells can improve health and extend lifespan. Rapamycin activates Nrf2 to control cell cycle arrest, but SASP production is regulated by a separate pathway.

Area of Science:

  • Cellular biology
  • Aging research
  • Molecular mechanisms of senescence

Background:

  • Cellular senescence contributes to age-related diseases and functional decline.
  • Removing senescent cells can enhance physiological function and longevity.
  • The senescence-associated secretory phenotype (SASP) composition varies with the trigger.
  • Rapamycin, an mTOR inhibitor, extends lifespan and inhibits senescence in vitro.
  • Nrf2 gene silencing induces premature senescence.

Purpose of the Study:

  • To investigate the molecular pathways by which rapamycin affects cellular senescence.
  • To elucidate the distinct regulatory mechanisms controlling cell cycle arrest and SASP production.

Main Methods:

  • In vitro studies of cell senescence.
  • Analysis of the Nrf2 pathway activation by rapamycin.
  • Investigation of pathways regulating SASP production, including MAPKAPK2.

Main Results:

  • Rapamycin activates the Nrf2 pathway, leading to cell cycle arrest.
  • Rapamycin's effect on cell cycle arrest is independent of SASP regulation.
  • SASP production is regulated by a pathway distinct from Nrf2 activation, potentially involving MAPKAPK2 inhibition.

Conclusions:

  • Rapamycin utilizes the Nrf2 pathway to induce cell cycle arrest in senescent cells.
  • SASP production is modulated by a separate signaling cascade, distinct from the Nrf2-mediated cell cycle arrest pathway.
  • Understanding these distinct pathways may offer new therapeutic targets for age-related pathologies.
Keywords:
Cell cycle arrestCell senescenceNrf2RapamycinSASP

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