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Aberrant Rheb-mediated mTORC1 activation and Pten haploinsufficiency are cooperative oncogenic events

Caterina Nardella1, Zhenbang Chen, Leonardo Salmena

  • 1Cancer Genetics Program, Beth Israel Deaconess Cancer Center, Department of Medicine and Pathology, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA 02115, USA.

Genes & Development
|August 19, 2008
PubMed

Insights

Rheb GTPase, a key activator of mTOR complex 1 (mTORC1), is amplified in prostate cancers. Its overexpression drives prostate hyperplasia and tumorigenesis, especially when combined with Pten haploinsufficiency.

Area of Science:

  • Oncology
  • Molecular Biology
  • Cell Signaling

Background:

  • The mammalian target of rapamycin (mTOR) pathway is a central regulator of cell growth and metabolism, frequently dysregulated in cancer.
  • mTOR complex 1 (mTORC1) signaling is activated by Rheb GTPase.
  • Prostate cancer development involves complex genetic and signaling alterations.

Purpose of the Study:

  • To investigate the role of Rheb GTPase in prostate cancer.
  • To determine if Rheb amplification contributes to prostate tumorigenesis.
  • To explore the interaction between Rheb and Pten in prostate cancer development.

Main Methods:

  • Analysis of Rheb GTPase amplification in human prostate cancer samples.
  • Generation of mouse models with Rheb overexpression in the prostate.
  • Assessment of prostate hyperplasia, senescence, and Akt activation in response to Rheb overexpression.
  • Evaluation of the cooperative effect of Rheb overexpression and Pten haploinsufficiency on prostate tumorigenesis.

Main Results:

  • Rheb GTPase is amplified in human prostate cancers.
  • Rheb overexpression in mouse prostate induces hyperplasia and a low-grade neoplastic phenotype.
  • Rheb overexpression triggers a senescence response and limits Akt activation.
  • Pten haploinsufficiency significantly cooperates with Rheb overexpression to promote prostate tumorigenesis.

Conclusions:

  • Rheb GTPase functions as a proto-oncogene in the context of prostate cancer.
  • Rheb amplification is a contributing factor to prostate tumorigenesis.
  • The interplay between Rheb and Pten is critical for prostate cancer development.

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