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Temporal mTOR inhibition protects Fbxw7-deficient mice from radiation-induced tumor development

Yueyong Liu1, Yurong Huang, Zeran Wang

  • 1Life Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA.

Aging
|March 5, 2013
PubMed

Insights

Loss of FBXW7 tumor suppressor function accelerates cancer. Inhibiting mTOR signaling with rapamycin delays tumor development in mice lacking FBXW7, revealing a therapeutic target.

Area of Science:

  • Oncology
  • Molecular Biology
  • Cancer Research

Background:

  • FBXW7 is a known tumor suppressor targeting oncoproteins like mTOR.
  • The precise mechanisms by which FBXW7 loss drives tumorigenesis are not fully understood.

Purpose of the Study:

  • To investigate the role of FBXW7 loss in tumor development.
  • To explore the therapeutic potential of mTOR inhibition in FBXW7-deficient cancers.

Main Methods:

  • Utilized Fbxw7/p53 double heterozygous (Fbxw7+/-p53+/-) and p53 single heterozygous (p53+/-) mouse models.
  • Administered short-term rapamycin (mTOR inhibitor) post-radiation exposure.
  • Monitored tumor latency and mTOR activity.

Main Results:

  • Radiation-induced mTOR downregulation is dependent on FBXW7.
  • Rapamycin treatment significantly postponed tumor development in Fbxw7+/-p53+/- mice.
  • Tumor latency in rapamycin-treated Fbxw7+/-p53+/- mice mirrored that of p53+/- mice.
  • Sustained mTOR inhibition was observed in tumors despite short-term rapamycin treatment.

Conclusions:

  • FBXW7 loss contributes to tumor development, partly through dysregulation of mTOR signaling.
  • Targeting the mTOR pathway with rapamycin can suppress tumor initiation associated with FBXW7 deficiency.
  • mTOR inhibition represents a promising therapeutic strategy for FBXW7-mutated cancers.

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