Frataxin participates to the hypoxia-induced response in tumors

Annunziato Mangiola, Giulio Maira, Carmelo Anile, I Guccini, D Serio, I Condò, A Rufini, B Tomassini, D Fina, F Pallone, Mp Mongiardi, A Levi, N Ventura, R Testi, F. Malisan

Risultato della ricerca: Contributo in rivistaArticolo in rivista

28 Citazioni (Scopus)

Abstract

Defective expression of frataxin is responsible for the degenerative disease Friedreich's ataxia. Frataxin is a protein required for cell survival since complete knockout is lethal. Frataxin protects tumor cells against oxidative stress and apoptosis but also acts as a tumor suppressor. The molecular bases of this apparent paradox are missing. We therefore sought to investigate the pathways through which frataxin enhances stress resistance in tumor cells. We found that frataxin expression is upregulated in several tumor cell lines in response to hypoxic stress, a condition often associated with tumor progression. Moreover, frataxin upregulation in response to hypoxia is dependent on hypoxia-inducible factors expression and modulates the activation of the tumor-suppressor p53. Importantly, we show for the first time that frataxin is in fact increased in human tumors in vivo. These results show that frataxin participates to the hypoxia-induced stress response in tumors, thus implying that modulation of its expression could have a critical role in tumor cell survival and/or progression.
Lingua originaleEnglish
pagine (da-a)e123-e123
RivistaCELL DEATH & DISEASE
Volume2
DOI
Stato di pubblicazionePubblicato - 2011

Keywords

  • Anoxia
  • Apoptosis
  • Cell Line, Tumor
  • Gene Expression Regulation, Neoplastic
  • Humans
  • Iron-Binding Proteins
  • Neoplasms
  • Oxidative Stress
  • Tumor Suppressor Protein p53
  • Up-Regulation

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