The Ras-ERK and PI3K-mTOR pathways: cross-talk and compensation

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Michelle C Mendoza1, E Emrah Er, John Blenis

  • 1Department of Cell Biology, Harvard Medical School, Boston, MA 02115, USA.

Trends in Biochemical Sciences
|May 3, 2011
PubMed

Insights

The Ras-extracellular signal-regulated kinase (Ras-ERK) and PI3K-mTOR pathways control cell functions. Emerging evidence reveals significant cross-talk between these key cancer signaling pathways, impacting therapeutic strategies.

Area of Science:

  • Cellular signaling pathways
  • Molecular biology
  • Cancer research

Background:

  • Ras-extracellular signal-regulated kinase (Ras-ERK) and phosphatidylinositol 3-kinase-mammalian target of rapamycin (PI3K-mTOR) pathways are critical regulators of cellular processes.
  • These pathways were among the earliest discovered proto-oncogenes and cellular kinase activities.
  • Initially viewed as linear, early research suggested potential interactions between Ras-ERK and PI3K-mTOR.

Purpose of the Study:

  • To elucidate the cross-talk between Ras-ERK and PI3K-mTOR signaling pathways.
  • To understand the co-regulation of downstream cellular functions by these pathways.
  • To assess the significance of this cross-talk in the context of cancer therapeutics.

Main Methods:

  • Review of historical experimental data on Ras-ERK and PI3K-mTOR.
  • Analysis of molecular mechanisms underlying pathway interactions.
  • Evaluation of clinical data related to pathway dysregulation in cancer.

Main Results:

  • Confirmation of significant cross-talk and co-regulatory functions between Ras-ERK and PI3K-mTOR pathways.
  • Identification of specific molecular nodes where these pathways intersect.
  • Demonstration that pathway interactions influence cellular outcomes like survival and proliferation.

Conclusions:

  • The Ras-ERK and PI3K-mTOR pathways are not independent but extensively interconnected.
  • Understanding this cross-talk is crucial for developing effective cancer therapies.
  • Targeting these interacting pathways may offer novel therapeutic opportunities.

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