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Investigating the role of Aurora kinases in RAS signaling

Audrey Kosik1, Michael E Bekier, Jamie D Katusin

  • 1Department of Biological Sciences, University of Toledo, 2801 W. Bancroft Street, MS 601, Toledo, Ohio 43606, USA.

Journal of Cellular Biochemistry
|November 15, 2008
PubMed

Insights

Aurora kinases do not directly impact RAS-MAPK signaling or cell cycle regulation in cancer. Their overexpression does not enhance oncogenic RAS-driven transformation, even when inducing polyploidy.

Area of Science:

  • Oncology
  • Molecular Biology
  • Cell Biology

Background:

  • Activating RAS mutations drive malignant transformation in various cancers.
  • RAS signaling pathways, including potential roles for Aurora kinases, are implicated in cellular transformation.
  • Aurora kinase overexpression is common in human tumors and may cooperate with oncogenic RAS.

Purpose of the Study:

  • To investigate the mechanistic link between Aurora kinases and RAS-mediated cellular transformation.
  • To determine if Aurora kinase inhibitors affect RAS signaling pathways (MEK/MAPK).
  • To assess the role of Aurora kinases and polyploidy in RAS-driven neoplastic transformation.

Main Methods:

  • Utilized two Aurora kinase inhibitors to probe RAS signaling.
  • Assessed the impact of Aurora kinase inhibition on MEK1/2 and MAPK phosphorylation.
  • Examined cell cycle progression and apoptosis in cancer cells with and without activated RAS.
  • Investigated the effect of induced polyploidy (using cytochalasin D and blebbistatin) on oncogenic RAS transformation.

Main Results:

  • Aurora kinase inhibitors did not alter MEK1/2 or MAPK phosphorylation in response to RAS.
  • Inhibiting Aurora kinases did not affect cell cycle length or induce apoptosis in cancer cells.
  • Inducing polyploidy did not enhance transformation driven by oncogenic RAS.
  • Observations suggest Aurora kinases do not directly participate in the RAS-MAPK pathway.

Conclusions:

  • Aurora kinases do not appear to play a direct role in the RAS-MAPK pathway.
  • The polyploid state induced by Aurora kinases does not enhance neoplastic transformation by RAS.
  • These findings challenge the proposed indirect mechanisms of Aurora kinase involvement in RAS-driven cancer.

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