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Requirement for interaction of PI3-kinase p110α with RAS in lung tumor maintenance

Esther Castellano1, Clare Sheridan, May Zaw Thin

  • 1Signal Transduction Laboratory, Cancer Research UK London Research Institute, 44 Lincoln's Inn Fields, London WC2A 3LY, UK.

Cancer Cell
|November 16, 2013
PubMed

Insights

RAS proteins activate PI3-kinases. Inhibiting RAS interaction with p110α in established KRAS-driven lung tumors halts growth and causes regression, offering a potential therapeutic strategy.

Area of Science:

  • Oncology
  • Molecular Biology
  • Cancer Genetics

Background:

  • RAS proteins are key regulators of cellular signaling pathways, including the PI3K/AKT pathway.
  • Mutations in RAS genes are common in human cancers, driving tumor initiation and progression.
  • The role of RAS-PI3K interaction in maintaining established RAS-driven tumors remains incompletely understood.

Purpose of the Study:

  • To investigate the necessity of RAS interaction with the p110α subunit of PI3K for the maintenance of established KRAS-driven lung tumors.
  • To evaluate the therapeutic potential of disrupting RAS-p110α interaction in established lung cancer models.

Main Methods:

  • Utilized an inducible mouse model with mutant KRAS-driven lung tumors.
  • Employing genetic manipulation to specifically disrupt the RAS binding domain of p110α in established tumors.
  • Assessed tumor stasis and regression following targeted disruption of RAS-p110α interaction.
  • Investigated the effects of combining RAS-p110α interaction inhibition with MEK inhibitors.
  • Compared outcomes with complete p110α expression or activity ablation.

Main Results:

  • Disrupting the interaction between RAS and p110α in established tumors led to long-term tumor stasis and partial regression.
  • This effect was demonstrated to be tumor cell-autonomous.
  • Combination therapy with MEK inhibition significantly enhanced the anti-tumor effects.
  • Complete ablation of p110α expression or activity yielded similar results but with increased toxicity.

Conclusions:

  • RAS interaction with p110α is crucial for the maintenance of established KRAS-driven lung tumors.
  • Targeting the RAS-p110α interaction presents a promising therapeutic strategy for lung cancer.
  • Combination strategies, such as inhibiting RAS-p110α interaction alongside MEK inhibition, may offer improved efficacy and reduced toxicity.

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