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Rheb signaling and tumorigenesis: mTORC1 and new horizons

Marisol E Armijo1, Tania Campos1, Francisco Fuentes-Villalobos1

  • 1Laboratorio de Transducción de Señales y Cáncer, Departamento de Bioquímica y Biología Molecular, Facultad de Ciencias Biológicas, Universidad De Concepción, Concepción, Chile.

International Journal of Cancer
|August 4, 2015
PubMed

Insights

The small GTPase Rheb regulates cell growth via mTORC1 signaling. Understanding Rheb

Area of Science:

  • Molecular Biology
  • Cell Biology
  • Oncology

Background:

  • Rheb, a Ras superfamily GTPase, is crucial for cell growth by activating mTORC1.
  • Dysregulation of Rheb/mTORC1 signaling contributes to proliferative disorders and cancer.
  • mTORC1 inhibitors show antitumor activity but face limitations in efficacy.

Purpose of the Study:

  • To review Rheb's role in cell growth and its relevance in proliferative disorders and cancer.
  • To explore Rheb functions contributing to resistance against mTORC1 inhibitors.
  • To focus on mTORC1-independent Rheb functions in cancer cell survival and tumorigenesis.

Main Methods:

  • Literature review of Rheb's role in cell growth.
  • Analysis of Rheb's involvement in proliferative disorders and cancer.
  • Examination of Rheb functions related to mTORC1 inhibitor resistance.

Main Results:

  • Rheb's canonical role in stimulating mTORC1-mediated cell growth is established.
  • Rheb deregulation is linked to various cancers.
  • Noncanonical Rheb functions may drive cancer cell survival and tumor resistance.

Conclusions:

  • Further research into Rheb's noncanonical functions is essential for understanding cancer.
  • Targeting Rheb's diverse roles may overcome resistance to current cancer therapies.
  • Understanding Rheb's multifaceted functions can inform novel therapeutic strategies for cancer.
Keywords:
RhebmTORC1mTORC1-independent Rheb functionsrapamycin resistance

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