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Glucose--a sweet way to die: metabolic switching modulates tumor cell death

Marion MacFarlane1, Gemma L Robinson, Kelvin Cain

  • 1MRC Toxicology Unit, University of Leicester, Leicester, UK. mm21@le.ac.uk

Cell Cycle (Georgetown, Tex.)
|September 18, 2012
PubMed

Insights

Targeting cancer cell metabolism enhances apoptosis sensitivity. Inhibiting glycolysis boosts TRAIL-induced cell death, while glucose deprivation has complex effects, modulated by Akt/AMPK/mTORC1 signaling and protein degradation.

Area of Science:

  • Cancer Biology
  • Cell Death Pathways
  • Metabolic Regulation

Background:

  • Tumor cells rely on aerobic glycolysis for metabolism.
  • Tumor necrosis factor-related apoptosis-inducing ligand (TRAIL) induces apoptosis via caspase cascades.
  • TRAIL can trigger extrinsic apoptosis directly (Type I) or indirectly via mitochondria (Type II).

Purpose of the Study:

  • To investigate how cellular metabolic status influences TRAIL-induced apoptosis.
  • To elucidate the signaling pathways mediating metabolic effects on apoptosis.
  • To explore therapeutic strategies combining metabolic targeting with apoptosis inducers.

Main Methods:

  • Analysis of TRAIL-induced apoptosis in cancer cells under varying metabolic conditions (glycolysis inhibition, glucose deprivation).
  • Investigation of key signaling pathways including Akt, AMPK, and mTORC1.
  • Assessment of protein translation and degradation rates of Bcl-2 family proteins.

Main Results:

  • Glycolysis inhibition with 2-deoxyglucose potentiates TRAIL-induced apoptosis.
  • Glucose deprivation paradoxically inhibits apoptosis, modulated by Akt/AMPK/mTORC1 balance.
  • Metabolic status alters protein translation and degradation, affecting Bcl-2 family protein equilibrium and mitochondrial pathway sensitivity.

Conclusions:

  • Cancer cell metabolism significantly impacts sensitivity to TRAIL-induced apoptosis.
  • Targeting cancer cell metabolism can enhance apoptosis, offering a novel therapeutic strategy.
  • Combined metabolic and apoptotic therapies may improve cancer treatment outcomes.

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