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MTOR regulates the pro-tumorigenic senescence-associated secretory phenotype by promoting IL1A translation

Remi-Martin Laberge1, Yu Sun2, Arturo V Orjalo1

  • 1Buck Institute for Research on Aging, Novato, California 94945, USA.

Nature Cell Biology
|July 7, 2015
PubMed

Insights

Rapamycin, a drug targeting the mechanistic target of rapamycin (mTOR) pathway, reduces inflammation from senescent cells. This finding suggests rapamycin could help treat age-related diseases and cancer by targeting cellular senescence.

Area of Science:

  • Cellular and Molecular Biology
  • Aging Research
  • Immunology

Background:

  • Cellular senescence, a state of irreversible cell cycle arrest, plays a dual role in cancer suppression and age-related pathologies.
  • Senescence-associated secretory phenotype (SASP) involves the release of inflammatory factors that can promote tissue dysfunction and disease.
  • The target of rapamycin (TOR) kinase pathway is implicated in aging and longevity, with rapamycin known to extend lifespan.

Purpose of the Study:

  • To investigate the effect of rapamycin on the pro-inflammatory phenotype of senescent cells.
  • To determine how mTOR inhibition influences the senescence-associated secretory phenotype (SASP).
  • To assess the therapeutic potential of rapamycin in age-related diseases and cancer models.

Main Methods:

  • Treatment of senescent cells with rapamycin.
  • Analysis of cytokine mRNA and protein levels (e.g., IL6, IL1A).
  • Assessment of NF-κB transcriptional activity.
  • In vivo studies using a mouse model of prostate tumor growth stimulated by senescent fibroblasts.

Main Results:

  • Rapamycin selectively blunted the pro-inflammatory SASP in senescent cells.
  • mTOR inhibition reduced IL6 mRNA but selectively suppressed IL1A translation.
  • Reduced IL1A diminished NF-κB activity, a key regulator of SASP.
  • Rapamycin-treated senescent cells showed reduced ability to stimulate prostate tumor growth in mice.

Conclusions:

  • Rapamycin ameliorates senescence-associated inflammation by selectively suppressing key SASP components.
  • Targeting mTOR with rapamycin may offer a therapeutic strategy for age-related pathologies, including cancer.
  • Suppression of senescence-associated inflammation by rapamycin highlights its potential in promoting healthy aging.

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