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Loss of Tsc1 accelerates malignant gliomagenesis when combined with oncogenic signals

Daisuke Yamada1, Takayuki Hoshii, Shingo Tanaka

  • 1Division of Molecular Genetics, Cancer and Stem Cell Research Program, Cancer Research Institute, Kanazawa University, Kakuma-machi, Kanazawa, Ishikawa 920-1192, Japan.

Journal of Biochemistry
|December 26, 2013
PubMed

Insights

Loss of Tsc1 in mice suppressed neural stem cell self-renewal but accelerated glioblastoma development when combined with EGFRvIII. mTORC1 hyperactivation modifies glioma progression.

Area of Science:

  • Oncology
  • Neuroscience
  • Molecular Biology

Background:

  • Glioblastomas often have genetic alterations activating mTORC1.
  • Loss of Tuberous Sclerosis Complex 1 (TSC1) or TSC2, negative regulators of mTORC1, occurs in glioblastoma.
  • The role of TSC complex loss in malignant glioma development is unclear.

Purpose of the Study:

  • To investigate the role of Tsc1 in gliomagenesis using a mouse model.
  • To determine how Tsc1 deficiency impacts neural stem/progenitor cell (NSPC) self-renewal and proliferation.
  • To assess the effect of Tsc1 loss on glioma development in conjunction with oncogenic signals like EGFRvIII.

Main Methods:

  • Utilized a mouse model to study Tsc1 deficiency in gliomagenesis.
  • Employed serial neurosphere-forming assays to evaluate NSPC self-renewal.
  • Investigated the impact of combined Tsc1 and p16(Ink4a)p19(Arf) deficiency.
  • Assessed glioma development in a model driven by the EGFRvIII oncogene.

Main Results:

  • Tsc1 deficiency in mice increased mTORC1 activity and impaired NSPC self-renewal.
  • Defective NSPC self-renewal was rescued by p16(Ink4a)p19(Arf) deficiency.
  • Loss of Tsc1 accelerated glioma onset and progression in the EGFRvIII model, increasing tumor mass and vascularization.

Conclusions:

  • While mTORC1 hyperactivation alone may not cause gliomagenesis, it significantly modifies glioma development.
  • Tsc1 loss acts as a potent modifier of glioma progression when oncogenic signals are present.
  • These findings highlight the complex interplay between mTORC1 signaling and oncogene-driven gliomagenesis.
Keywords:
TSC1gliomagenesismTORC1neural stemprogenitor cells

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