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Geroconversion: irreversible step to cellular senescence.

Mikhail V Blagosklonny1

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

Cell Cycle (Georgetown, Tex.)
|December 9, 2014
PubMed
Summary
This summary is machine-generated.

Cellular senescence involves two steps: cell cycle arrest and geroconversion, a futile growth process. This process, driven by pathways like mTOR, leads to aging phenotypes and age-related diseases.

Keywords:
agingcell cycle arrestgerogenic conversionmTORoncogenic trsnformation

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Area of Science:

  • Gerontology
  • Cell Biology
  • Molecular Biology

Background:

  • Cellular senescence is a fundamental aging process characterized by cell cycle arrest.
  • Senescence can be initiated by various stressors, including oncogenes and replicative exhaustion.
  • The transition from reversible arrest to irreversible senescence, termed geroconversion, is not fully understood.

Purpose of the Study:

  • To elucidate the two-step model of cellular senescence, including the role of geroconversion.
  • To identify the molecular drivers of geroconversion, particularly growth-promoting pathways.
  • To understand the organismal consequences of geroconversion and the potential of gerosuppressants like rapamycin.

Main Methods:

  • The study likely involves in vitro cell culture models of senescence (replicative, stress-induced, oncogene-induced).
  • Analysis of key molecular pathways, including mTOR signaling, nutrient-sensing pathways, and mitogen-activated pathways.
  • Observation and characterization of cellular phenotypes associated with geroconversion, such as hypertrophy and secretion.

Main Results:

  • Cellular senescence is consistently described by a two-step model: cell cycle arrest followed or preceded by geroconversion.
  • Geroconversion is a form of futile growth during cell cycle arrest, driving the transition to irreversible senescence.
  • Growth-promoting pathways, including mTOR, are key drivers of geroconversion, leading to pro-inflammatory and hypertrophic phenotypes.

Conclusions:

  • Geroconversion is a critical, growth-driven process that solidifies cellular senescence.
  • The consequences of geroconversion extend to organismal aging and age-related diseases.
  • Gerosuppressants like rapamycin, which inhibit geroconversion drivers, show potential for lifespan extension.