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Glucose deprivation activates a metabolic and signaling amplification loop leading to cell death

Nicholas A Graham1, Martik Tahmasian, Bitika Kohli

  • 1Crump Institute for Molecular Imaging, University of California, Los Angeles, CA, USA.

Molecular Systems Biology
|June 28, 2012
PubMed

Insights

Cancer cells relying on glucose face rapid cell death upon its withdrawal. This triggers a signaling cascade involving reactive oxygen species (ROS) and tyrosine kinases, highlighting the link between metabolism and cancer cell survival.

Area of Science:

  • Cancer Biology
  • Cellular Metabolism
  • Signal Transduction

Background:

  • Cancer cells exhibit altered metabolism, creating dependencies on specific nutrients like glucose for survival.
  • Understanding the mechanisms of cell death in glucose-dependent cancer cells is crucial for therapeutic development.

Purpose of the Study:

  • To investigate the signaling pathways involved in cell death upon glucose withdrawal in cancer cells.
  • To elucidate the role of phospho-tyrosine signaling and reactive oxygen species (ROS) in this process.

Main Methods:

  • Utilized mass spectrometry-based phospho-proteomics to identify changes in protein phosphorylation.
  • Investigated the involvement of NADPH oxidase, mitochondria, and protein tyrosine phosphatases.
  • Assessed the role of reactive oxygen species (ROS) and tyrosine kinase signaling in cell death.

Main Results:

  • Glucose withdrawal rapidly induced high levels of phospho-tyrosine signaling, even in cells with active tyrosine kinases.
  • A unique signature of phospho-tyrosine activation associated with focal adhesions was observed.
  • Glucose withdrawal activated a positive feedback loop involving ROS generation, inhibition of protein tyrosine phosphatases, and increased tyrosine kinase signaling.
  • ROS generation and tyrosine kinase signaling synergistically amplified ROS, leading to cell death.

Conclusions:

  • Glucose withdrawal triggers a ROS-mediated cell death pathway in glucose-dependent cancer cells.
  • This pathway involves a feedback loop between ROS production and tyrosine kinase signaling.
  • Findings reveal critical cross-talk between cellular metabolism and signaling in maintaining cancer cell homeostasis.

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