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Techniques to Induce and Quantify Cellular Senescence
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cGAS is essential for cellular senescence.

Hui Yang1,2, Hanze Wang3, Junyao Ren1,2

  • 1Department of Molecular Biology, University of Texas Southwestern Medical Center, Dallas, TX 75390-9148.

Proceedings of the National Academy of Sciences of the United States of America
|May 24, 2017
PubMed
Summary

Cyclic GMP-AMP synthase (cGAS) is crucial for cellular senescence, acting as a barrier against cancer development. Its absence accelerates cell immortalization and hinders the anti-tumorigenic senescence response.

Keywords:
DNA damageDNA sensingcGAScancersenescence

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Area of Science:

  • Cellular and Molecular Biology
  • Immunology
  • Oncology

Background:

  • Cellular senescence is a vital mechanism preventing tumor formation and implicated in aging and tissue repair.
  • The DNA damage response triggers senescence, characterized by the senescence-associated secretory phenotype (SASP).
  • cGMP-AMP (cGAS) synthase, a sensor of cytosolic DNA, activates innate immunity.

Purpose of the Study:

  • To investigate the role of cGAS in mediating cellular senescence.
  • To determine if cGAS influences the senescence-associated secretory phenotype (SASP).
  • To assess the impact of cGAS on cellular immortalization and its correlation with cancer patient survival.

Main Methods:

  • Utilized mouse embryonic fibroblasts (MEFs) with and without cGAS to study senescence and immortalization.
  • Induced senescence using DNA damaging agents like radiation and etoposide.
  • Examined cGAS localization in response to DNA damage and its association with chromatin.
  • Correlated cGAS expression levels with survival data in human lung adenocarcinoma patients.

Main Results:

  • Deletion of cGAS accelerated spontaneous immortalization of MEFs.
  • cGAS deficiency abrogated SASP induced by spontaneous immortalization and DNA damaging agents.
  • cGAS translocates to the nucleus during mitosis and accumulates in cytoplasmic foci with damaged DNA.
  • Low cGAS expression in lung adenocarcinoma patients correlated with poorer survival outcomes.

Conclusions:

  • cGAS is essential for inducing and maintaining cellular senescence, acting as a tumor suppressor by retarding cell immortalization.
  • cGAS plays a distinct role in senescence, complementing its known function in innate immune activation.
  • cGAS deficiency is linked to adverse outcomes in lung adenocarcinoma, highlighting its clinical relevance.