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Measurements of Physiological Stress Responses in C. Elegans
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Cell cycle controls stress response and longevity in C. elegans.

Matthias Dottermusch1, Theresa Lakner1, Tobias Peyman1

  • 1Department of Medicine IV, Medical Center, Faculty of Medicine, University of Freiburg, Germany.

Aging
|September 27, 2016
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Summary

Inhibiting cell cycle genes like cyclin-dependent kinase 2 (cdk-2) and cyclin E (cye-1) in C. elegans promotes longevity and stress resistance. The gonad and its proliferating germ cells are key to this lifespan extension.

Keywords:
C. elegansDAF-16/FOXOSKN-1/Nrfagingcell cyclegermline

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Area of Science:

  • Genetics
  • Molecular Biology
  • Aging Research

Background:

  • Aging is influenced by various genes and mechanisms.
  • Cell cycle regulation plays a role in organismal health and lifespan.
  • The reproductive system, particularly the gonad, is linked to longevity in C. elegans.

Purpose of the Study:

  • To investigate the role of cell cycle factors, specifically cdk-2 and cye-1, in regulating aging and longevity.
  • To identify the specific organs and molecular pathways involved in cell cycle inhibition-induced longevity.
  • To explore the connection between germline signaling and longevity pathways.

Main Methods:

  • Genetic manipulation of cell cycle genes (cdk-2, cye-1) in C. elegans.
  • Assessing stress tolerance and lifespan in genetically modified worms.
  • Investigating the role of the gonad, germ cells, steroid hormone signaling, DAF-16, and SKN-1 in longevity.
  • Utilizing C. elegans as a model organism for aging studies.

Main Results:

  • Inhibition of cell cycle genes (cdk-2, cye-1) confers tolerance to environmental stress and extends lifespan.
  • The gonad, and specifically proliferating germ cells, are essential for mediating this longevity.
  • Steroid hormone signaling and the FOXO transcription factor DAF-16 are required for the longevity phenotype.
  • SKN-1 (mammalian Nrf ortholog) activates protective gene expression and induces longevity upon cell cycle gene inactivation.
  • Germline absence and cell cycle inhibition promote longevity via similar molecular pathways.

Conclusions:

  • Cell cycle genes are potent regulators of healthspan and longevity in C. elegans.
  • The gonad and germ cells are central mediators of longevity induced by cell cycle inhibition.
  • Longevity associated with cell cycle inhibition involves steroid hormone signaling, DAF-16, and SKN-1.
  • Cell cycle genes have functions beyond cell cycle progression, impacting aging and stress response.