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Activation of Apoptosis by Cytoplasmic Microinjection of Cytochrome c
07:42

Activation of Apoptosis by Cytoplasmic Microinjection of Cytochrome c

Published on: June 29, 2011

MYCN sensitizes human neuroblastoma to apoptosis by HIPK2 activation through a DNA damage response

Marialaura Petroni1, Veronica Veschi, Andrea Prodosmo

  • 1Department of Experimental Medicine, Sapienza University of Rome, Policlinico Umberto I, Viale Regina Elena, 324, 00161, Rome, Italy.

Molecular Cancer Research : MCR
|December 22, 2010
PubMed

Insights

MYCN amplification in neuroblastoma sensitizes cells to apoptosis via p53 activation. The drug Nutlin-3 enhances this effect, offering a new therapy for difficult-to-treat neuroblastoma tumors.

Area of Science:

  • Oncology
  • Molecular Biology
  • Genetics

Background:

  • MYCN amplification is a key driver of neuroblastoma progression, linked to poor patient outcomes.
  • Despite intensive treatments, MYCN-amplified neuroblastomas remain challenging, necessitating novel therapeutic strategies.
  • MYCN overexpression paradoxically sensitizes neuroblastoma cells to apoptosis, suggesting a targetable vulnerability.

Purpose of the Study:

  • To elucidate the molecular mechanisms connecting MYCN to apoptosis induction in neuroblastoma.
  • To identify potential therapeutic targets for MYCN-amplified neuroblastoma.
  • To evaluate the efficacy of p53-reactivating compounds in this context.

Main Methods:

  • Investigated the role of p53 and its phosphorylation at serine 46 (p53(S46)) in MYCN-driven apoptosis.
  • Utilized RNA interference to deplete HIPK2, a p53(S46) kinase.
  • Examined the impact of MYCN on DNA damage response pathways, including ATM and NBS1.
  • Assessed the effects of Nutlin-3, a p53-reactivating compound, alone and with clastogenic agents.

Main Results:

  • MYCN-dependent apoptosis requires p53 activation and p53(S46) phosphorylation.
  • HIPK2 kinase accumulates upon MYCN expression and is crucial for p53(S46) phosphorylation and apoptosis.
  • MYCN induces a DNA damage response that stabilizes HIPK2 by inhibiting its degradation via ATM and NBS1.
  • Nutlin-3 treatment in MYCN-amplified neuroblastoma promotes HIPK2 accumulation, p53(S46) phosphorylation, and apoptosis, especially when combined with clastogenic agents.

Conclusions:

  • A novel mechanism links MYCN to apoptosis through HIPK2-mediated p53(S46) phosphorylation.
  • The p53-reactivating compound Nutlin-3 effectively triggers apoptosis in MYCN-amplified neuroblastoma.
  • This pathway offers a promising therapeutic avenue for treating aggressive neuroblastoma.

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