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P73 regulates cisplatin-induced apoptosis in ovarian cancer cells via a calcium/calpain-dependent mechanism

S Al-Bahlani, M Fraser, AYC Wong, BS Sayan, R Bergeron, G Melino and BK Tsang


Oncogene (2011) 30, 4219–4230


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P73 is important in drug-induced apoptosis in some cancer cells, yet its role in the regulation of chemosensitivity in ovarian cancer (OVCA) is poorly understood. Furthermore, if and how the deregulation of p73-mediated apoptosis confers resistance to cisplatin (CDDP) treatment is unclear. Here we demonstrate that TAp73a overexpression enhanced CDDP-induced PARP cleavage and apoptosis in both chemosensitive (OV2008 and A2780s) and their resistant counterparts (C13* and A2780cp) and another chemoresistant OVCA cells (Hey); in contrast, the effect of DNp73a over-expression was variable. P73a downregulation attenuated CDDP-induced PUMA and NOXA upregulation and apoptosis in OV2008 cells. CDDP decreased p73a steady-state protein levels in OV2008, but not in C13*, although the mRNA expression was identical. CDDP-induced p73a downregulation was mediated by a calpain-dependent pathway. CDDP induced calpain activation and enhanced its cytoplasmic interaction and co-localization with p73a in OV2008, but not C13* cells. CDDP increased the intracellular calcium concentration ([Ca2þ]i) in OV2008 but not C13* whereas cyclopiazonic acid (CPA), a Ca2þ-ATPase inhibitor, caused this response and calpain activation, p73a processing and apoptosis in both cell types. CDDP-induced [Ca2þ]i increase in OV2008 cells was not effected by the elimination of extracellular Ca2þ, but this was attenuated by the depletion of internal Ca2þ store, indicating that mobilization of intracellular Ca2þ] stores was potentially involved. These findings demonstrate that p73a and its regulation by the Ca2þ-mediated calpain pathway are involved in CDDP-induced apoptosis in OVCA cells and that dysregulation of Ca2þ/calpain/p73 signaling may in part be the pathophysiology of CDDP resistance. Understanding the cellular and molecular mechanisms of chemoresistance will direct the development of effective strategies for the treatment of chemoresistant OVCA.


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