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Extracellular ATP induces apoptosis through P2X7R activation in acute myeloid leukemia cells but not in normal hematopoietic stem cells

By Valentina Salvestrini, Stefania Orecchioni, Giovanna Talarico, Francesca Reggiani, Cristina Mazzetti, Francesco Bertolini, Elisa Orioli, Elena Adinolfi, Francesco Di Virgilio, Annalisa Pezzi, Michele Cavo, Roberto M. Lemoli and Antonio Curti

Abstract

Recent studies have shown that high ATP levels exhibit direct cytotoxic effects on several cancer cells types. Among the receptors engaged by ATP, P2X7R is the most consistently expressed by tumors. P2X7R is an ATP-gated ion channel that could drive the opening of a non-selective pore, triggering cell-death signal. We previously demonstrated that acute myeloid leukemia (AML) cells express high level of P2X7R. Here, we show that P2X7R activation with high dose ATP induces AML blast cells apoptosis. Moreover, P2X7R is also expressed on leukemic stem/progenitor cells (LSCs) which are sensitive to ATP-mediated cytotoxicity. Conversely, this cytotoxic effect was not observed on normal hematopoietic stem/progenitor cells (HSCs). Notably, the antileukemic activity of ATP was also observed in presence of bone marrow stromal cells and its addition to the culture medium enhanced cytosine arabinoside cytotoxicity despite stroma-induced chemoresistance. Xenotransplant experiments confirmed ATP antineoplastic activity in vivo. Overall, our results demonstrate that P2X7R stimulation by ATP induced a therapeutic response in AML at the LSC level while the normal stem cell compartment was not affected. These results provide evidence that ATP would be promising for developing innovative therapy for AML

Topics: Acute myeloid leukemia (AML), Apoptosis, ATP, Leukemic stem cell (LSC), P2X7R, Oncology
Year: 2017
OAI identifier: oai:iris.unife.it:11392/2366821
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