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Reactivation of p53 mutants by prima-1 [corrected] in thyroid cancer cells

Rosa Linda Messina1, Mariangela Sanfilippo, Veronica Vella

  • 1Department of Clinical and Molecular Biomedicine, University of Catania, Catania, Italy.

International Journal of Cancer
|June 8, 2011
PubMed

Insights

The compound Prima-1 restores tumor-suppressor activity in p53 mutants, enhancing chemotherapy effectiveness and inducing apoptosis in undifferentiated thyroid cancer cells. This suggests a novel therapeutic approach for thyroid carcinomas.

Area of Science:

  • Oncology
  • Molecular Biology
  • Pharmacology

Background:

  • Undifferentiated thyroid carcinomas often harbor p53 mutations, leading to chemotherapy resistance.
  • The p53 tumor suppressor protein plays a critical role in cell cycle regulation and apoptosis.

Purpose of the Study:

  • To investigate the efficacy of p53 reactivation and induction of massive apoptosis (Prima-1) in thyroid cancer cells with p53 mutations.
  • To explore Prima-1's potential to overcome chemoresistance and restore tumor suppressor activity.

Main Methods:

  • Treatment of various thyroid cancer cell lines with Prima-1.
  • Analysis of p53 target gene expression (p21WAF1, Bax, MDM2) using real-time PCR and Western blot.
  • Assessment of cell viability, apoptosis, and cell cycle arrest via fluorescence-activated cell sorting (FACS).
  • Investigation of the role of p53 mutants and p73 using small interfering RNA (siRNA) and co-immunoprecipitation (co-IP).

Main Results:

  • Prima-1 reduced thyroid cancer cell viability and upregulated p53 target genes in cells with p53 mutations.
  • Prima-1 enhanced the cytotoxic effects of doxorubicin and cisplatin, including in chemo-resistant cell lines.
  • Prima-1 promoted cell cycle arrest and apoptosis, with effects mediated by p53 mutants, not p73.
  • Prima-1 prevented dominant-negative effects of p53 mutants and inhibited their sequestration of TAp73.

Conclusions:

  • Prima-1 effectively reactivates mutant p53, restoring tumor suppressor functions in undifferentiated thyroid cancer cells.
  • Prima-1 demonstrates potential as a therapeutic agent to enhance chemotherapy efficacy and induce apoptosis.
  • Targeting p53 mutants with compounds like Prima-1 represents a promising novel therapeutic strategy for undifferentiated thyroid carcinomas.

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