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S6K in geroconversion

Olga V Leontieva1, Zoya N Demidenko, Mikhail V Blagosklonny

  • 1Department of Cell Stress Biology; Roswell Park Cancer Institute; Buffalo, NY USA.

Cell Cycle (Georgetown, Tex.)
|September 17, 2013
PubMed

Insights

The mechanistic target of rapamycin (MTOR) pathway influences cellular senescence. Targeting p70S6K, but not MEK, preserves replicative potential during cell cycle arrest, revealing distinct roles in geroconversion.

Area of Science:

  • Cellular senescence
  • Molecular biology
  • Aging research

Background:

  • Cellular senescence is a key process in aging and disease.
  • The mechanistic target of rapamycin (MTOR) pathway is implicated in senescence.
  • Geroconversion describes the transition from reversible to irreversible cell cycle arrest.

Purpose of the Study:

  • To investigate the distinct roles of p70S6K and MEK in geroconversion.
  • To determine the impact of p70S6K inhibition on replicative potential during senescence.
  • To elucidate the relationship between MTOR pathway components and cell cycle arrest.

Main Methods:

  • Utilized siRNA to inhibit p70S6K expression.
  • Employed a p70 S6 kinase inhibitor (PF-4708671).
  • Assessed replicative potential (RP) and cyclin D1 induction during p21-induced cell cycle arrest.

Main Results:

  • siRNA for p70S6K partially prevented loss of RP without affecting cyclin D1.
  • PF-4708671 inhibited S6 phosphorylation and preserved RP, with minimal impact on cyclin D1.
  • MEK inhibition primarily affects cyclin D1 induction, while p70S6K impacts RP.

Conclusions:

  • p70S6K and MEK play divergent roles in the geroconversion process.
  • Targeting p70S6K offers a potential strategy to preserve cellular function during senescence.
  • Understanding these distinct pathways is crucial for aging and disease research.
Keywords:
agingcancercell cyclegrowthrapalogssenescence

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