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RUNX1 and its fusion oncoprotein derivative, RUNX1-ETO, induce senescence-like growth arrest independently of

K Wolyniec1, S Wotton, A Kilbey

  • 1Molecular Oncology Laboratory, Faculty of Veterinary Medicine, Institute of Comparative Medicine, University of Glasgow, Bearsden, Glasgow, Scotland.

Oncogene
|May 19, 2009
PubMed

Insights

RUNX1 and RUNX1-ETO proteins induce senescence, a cancer fail-safe mechanism, in human cells. These RUNX proteins trigger distinct cell responses compared to RAS oncogenes, highlighting their unique roles in cancer development.

Area of Science:

  • Molecular Biology
  • Cancer Research
  • Cellular Senescence

Background:

  • RUNX genes are implicated in cancer fail-safe mechanisms, evidenced by their induction of senescence and impaired RAS-induced senescence in Runx2-deficient cells.
  • RUNX1 has been shown to induce senescence-like growth arrest in primary murine fibroblasts.

Purpose of the Study:

  • To investigate the role of RUNX1 and its oncogenic fusion proteins in inducing senescence in human primary fibroblasts.
  • To compare the senescence-inducing phenotypes of RUNX1, RUNX1-ETO, and H-RAS(V12).

Main Methods:

  • Induction of senescence in human primary fibroblasts using RUNX1, RUNX1-ETO, and H-RAS(V12).
  • Analysis of DNA damage signaling, chromatin condensation, p53, p14Arf, p16Ink4a, reactive oxygen species, and p38 MAPK activation.
  • Functional assessment of RUNX1 isoforms and TEL-RUNX1 fusion protein.

Main Results:

  • RUNX1 induces senescence in human fibroblasts; high-affinity DNA binding is necessary but not sufficient.
  • RUNX1-ETO potently induces senescence, distinct from its dominant-negative potential.
  • RUNX effectors induce earlier growth stasis with less DNA damage signaling and chromatin condensation compared to H-RAS(V12).
  • Senescence induction by RUNX1 and RUNX1-ETO involves p53, reactive oxygen species, and p38 MAPK pathways, independent of p14Arf.
  • RUNX1-ETO induces senescence in p16Ink4a-null cells, suggesting context-specific interactions.

Conclusions:

  • RUNX1 and RUNX1-ETO play significant roles in cellular senescence, a critical fail-safe mechanism against cancer.
  • Replication-independent pathways are involved in RUNX and RUNX1-ETO-induced senescence.
  • The oncogenic activity of RUNX1 fusion proteins correlates with their distinct interactions with cellular fail-safe responses.

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