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The Ras radiation resistance pathway.

A K Gupta1, V J Bakanauskas, G J Cerniglia

  • 1Department of Radiation Oncology, University of Pennsylvania, 195 John Morgan Building, 3620 Hamilton Walk, Philadelphia, PA 19104, USA.

Cancer Research
|May 19, 2001
PubMed
Summary
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The phosphoinositide-3-kinase (PI3K) pathway enhances tumor cell survival against radiation therapy. Inhibiting PI3K could sensitize tumors to radiotherapy, improving cancer treatment outcomes.

Area of Science:

  • Oncology
  • Molecular Biology
  • Radiotherapy Research

Background:

  • Critical pathways for tumor cell radioresistance remain poorly understood.
  • The ras oncogene, prevalent in many cancers, is known to increase radioresistance.

Purpose of the Study:

  • To identify Ras effector pathways crucial for tumor cell survival following ionizing radiation.
  • To investigate the role of phosphoinositide-3-kinase (PI3K) in mediating radioresistance.

Main Methods:

  • Utilized PI3K inhibitor LY294002 to assess radiosensitization in cells with mutant and wild-type ras.
  • Examined downstream targets of PI3K, including p70S6K, and other signaling pathways (Raf-MEK-MAPK, Ras-MEK-p38) using specific inhibitors.
  • Investigated the effect of expressing active PI3K in wild-type ras cells.

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Main Results:

  • LY294002 selectively radiosensitized cells with mutant ras oncogenes.
  • Inhibition of p70S6K, Raf-MEK-MAPK, or Ras-MEK-p38 pathways did not affect radiation survival in oncogenic ras cells.
  • Active PI3K expression in wild-type ras cells led to increased radioresistance, which was reversed by LY294002.

Conclusions:

  • The PI3K pathway plays a significant role in conferring enhanced radioresistance to tumor cells.
  • PI3K is a potential therapeutic target for radiosensitizing tumors and improving radiotherapy efficacy.