Abstract
A growing body of research has highlighted the complex range of tumoral traits acquired during H-Ras-driven transformation and maintenance, which include proliferative signaling, growth suppressor evasion and resistance to cell death. Clear molecular information about these processes is not yet available, but recent evidence has provided solid support for the importance of mitochondria. Here, we show that the induction of oncogenic H-Ras leads to changes in intracellular calcium (Ca2+), evaluate the temporal relationship between oncogene expression and mitochondrial physiology, and demonstrate that Ca2+ homeostasis is altered by caveolin-1, a protein that has a key role in tumor maintenance. Our results indicate that tumor-suppressor caveolin-1 is a core component of the Ca2+-dependent apoptotic pathway and participates in the regulation of critical mitochondrial functions during tumor development. The compromised caveolin-1/Ca2+ axis contributes to failure in both mitochondrial metabolism and apoptosis, thereby sustaining the neoplastic phenotype. These results illustrate a direct link between Ca2+ regulation and mitochondrial biology in cancer.
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Acknowledgements
This research was supported by: the Italian Ministry of Health to AR. SP is supported by a FISM (Fondazione Italiana Sclerosi Multipla) research fellowship (2012/B/11), whereas SM by FIRC (Fondazione Italiana Ricerca sul Cancro) fellowship. PP is financed by Italian Association for Cancer Research (AIRC), Telethon (GGP09128 and GGP11139B), local funds from the University of Ferrara, the Italian Ministry of Education, University and Research (COFIN, FIRB and Futuro in Ricerca), the Italian Cystic Fibrosis Research Foundation and Italian Ministry of Health.
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Rimessi, A., Marchi, S., Patergnani, S. et al. H-Ras-driven tumoral maintenance is sustained through caveolin-1-dependent alterations in calcium signaling. Oncogene 33, 2329–2340 (2014). https://doi.org/10.1038/onc.2013.192
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DOI: https://doi.org/10.1038/onc.2013.192
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