Journal
EMBO MOLECULAR MEDICINE
Volume 5, Issue 5, Pages 707-722Publisher
WILEY
DOI: 10.1002/emmm.201201504
Keywords
carboplatinum; DNA-PK; mutant p53; ovarian cancer; stathmin
Categories
Funding
- Associazione Italiana Ricerca sul Cancro IG (AIRC) [8551]
- Ministero della Salute
- AIRC Special Program Molecular Clinical Oncology '5 per mille'
- Regione Friuli-Venezia Giulia
- Italian University and Research Ministerium (PRIN FIRB)
- CRO-IRCCS Intramural Bench to Bedside
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Stathmin is a p53-target gene, frequently overexpressed in late stages of human cancer progression. Type II High Grade Epithelial Ovarian Carcinomas (HG-EOC) represents the only clear exception to this observation. Here, we show that stathmin expression is necessary for the survival of HG-EOC cells carrying a p53 mutant (p53MUT) gene. At molecular level, stathmin favours the binding and the phosphorylation of p53MUT by DNA-PKCS, eventually modulating p53MUT stability and transcriptional activity. Inhibition of stathmin or DNA-PKCS impaired p53MUTdependent transcription of several M phase regulators, resulting in M phase failure and EOC cell death, both in vitro and in vivo. In primary human EOC a strong correlation exists between stathmin, DNA-PKCS, p53MUT overexpression and its transcriptional targets, further strengthening the relevance of the new pathway here described. Overall our data support the hypothesis that the expression of stathmin and p53 could be useful for the identification of high risk patients that will benefit from a therapy specifically acting on mitotic cancer cells.
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