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PRIMA-1 cytotoxicity correlates with nucleolar localization and degradation of mutant p53 in breast cancer cells.

Abstract
PRIMA-1 has been identified as a compound that restores the transactivation function to mutant p53 and induces apoptosis in cells expressing mutant p53. Studies on subcellular distribution of the mutant p53 protein upon treatment with PRIMA-1Met, a methylated form of PRIMA-1, have suggested that redistribution of mutant p53 to nucleoli may play a role in PRIMA-1 induced apoptosis. Here, we specifically investigated the influence of PRIMA-1 on cellular localization of mutated p53-R280K endogenously expressed in tumour cells. By using immunofluorescence staining, we found a strong nucleolar redistribution of mutant p53 following PRIMA-1 treatment. This subcellular localization was associated to p53 degradation via ubiquitylation. When cells were treated with adriamycin, neither nucleolar redistribution nor mutant p53 down modulation and degradation were observed. Interestingly, cells where p53-R280K was silenced were more sensitive to PRIMA-1 than the parental ones. These results indicate that in some cellular context, the cell sensitivity to PRIMA-1 could depend on the abolition of a gain-of-function activity of the mutated p53, through a protein degradation pathway specifically induced by this compound.
AuthorsDebora Russo, Laura Ottaggio, Ilaria Penna, Giorgia Foggetti, Gilberto Fronza, Alberto Inga, Paola Menichini
JournalBiochemical and biophysical research communications (Biochem Biophys Res Commun) Vol. 402 Issue 2 Pg. 345-50 (Nov 12 2010) ISSN: 1090-2104 [Electronic] United States
PMID20946886 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't)
CopyrightCopyright © 2010 Elsevier Inc. All rights reserved.
Chemical References
  • Antineoplastic Agents
  • Aza Compounds
  • Bridged Bicyclo Compounds, Heterocyclic
  • Tumor Suppressor Protein p53
  • 2,2-bis(hydroxymethyl)-1-azabicyclo(2,2,2,)octan-3-one
Topics
  • Antineoplastic Agents (pharmacology)
  • Aza Compounds (pharmacology)
  • Breast Neoplasms (metabolism)
  • Bridged Bicyclo Compounds, Heterocyclic (pharmacology)
  • Cell Line, Tumor
  • Cell Nucleus (metabolism)
  • Drug Resistance, Neoplasm
  • Female
  • Humans
  • Mutation
  • Tumor Suppressor Protein p53 (genetics, metabolism)

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