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Normal cellular senescence and cancer susceptibility in mice genetically deficient in Ras-induced senescence-1 (Ris1)

M Nieto1, M Barradas, L M Criado

  • 1Tumor Suppression Group, Spanish National Cancer Center CNIO, Madrid, Spain.

Oncogene
|September 12, 2006
PubMed

Insights

Researchers investigated the Ras-induced senescence-1 (Ris1) gene

Area of Science:

  • Molecular biology
  • Genetics
  • Cancer research

Background:

  • Oncogenic Ras signaling induces cell-cycle arrest (oncogene-induced senescence, OIS), a tumor suppression mechanism.
  • Ris1 (Ras-induced senescence-1) is a novel, conserved gene upregulated during OIS, located at a cancer-associated chromosomal region (3p21.3).
  • Its physiological role and tumor suppressor potential were unexplored.

Purpose of the Study:

  • To investigate the physiological function of the Ris1 gene.
  • To determine if Ris1 acts as a tumor suppressor.
  • To assess Ris1's role in oncogene-induced senescence.

Main Methods:

  • Generation and analysis of Ris1-null mice.
  • Assessment of tumor predisposition in Ris1-deficient mice (spontaneous and chemically induced).
  • Analysis of proliferation, immortalization, senescence, and oncogenic transformation in Ris1-deficient embryonic fibroblasts.

Main Results:

  • Ris1-null mice are viable, fertile, and exhibit normal development and lifespan.
  • Ris1-deficient mice show no increased predisposition to spontaneous or chemically induced tumors.
  • Ris1-deficient cells are phenotypically indistinguishable from wild-type cells regarding senescence and transformation.

Conclusions:

  • The study found no evidence supporting a role for Ris1 in tumor suppression.
  • Ris1 does not appear to be essential for oncogene-induced senescence.
  • The physiological function of Ris1 remains to be elucidated.

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