P2X7 Integrates PI3K/AKT and AMPK-PRAS40-mTOR Signaling Pathways to Mediate Tumor Cell Death

被引:108
作者
Bian, Shu [1 ,2 ]
Sun, Xiaofeng [2 ]
Bai, Aiping [2 ]
Zhang, Chunqing [1 ]
Li, Linglin [3 ]
Enjyoji, Keiichi [2 ]
Junger, Wolfgang G. [3 ]
Robson, Simon C. [2 ]
Wu, Yan [2 ]
机构
[1] Shandong Univ, Prov Hosp, Dept Gastroenterol, Jinan 250100, Peoples R China
[2] Harvard Univ, Sch Med, Dept Med, Transplant Inst, Boston, MA 02115 USA
[3] Harvard Univ, Beth Israel Deaconess Med Ctr, Dept Surg, Sch Med, Boston, MA 02215 USA
基金
美国国家卫生研究院;
关键词
REGULATORY T-CELLS; EXTRACELLULAR ATP; NEUTROPHIL CHEMOTAXIS; P2X(7) RECEPTORS; CD39-NULL MICE; PROTEIN-KINASE; CANCER-THERAPY; LYTIC FUNCTION; ADENOSINE; RELEASE;
D O I
10.1371/journal.pone.0060184
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
Background: Extracellular adenosine triphosphate (ATP) functions as a novel danger signal that boosts antitumor immunity and can also directly kill tumor cells. We have previously reported that chronic exposure of tumor cells to ATP provokes P2X7-mediated tumor cell death, by as yet incompletely defined molecular mechanisms. Methodology/Principal Findings: Here, we show that acute exposure of tumor cells to ATP results in rapid cytotoxic effects impacting several aspects of cell growth/survival, leading to inhibition of tumor growth in vitro and in vivo. Using agonist and antagonist studies together with generation of P2X7 deficient tumor cell lines by lentiviral shRNA delivery system, we confirm P2X7 to be the central control node transmitting extracellular ATP signals. We identify that downstream intracellular signaling regulatory networks implicate two signaling pathways: the known P2X7-PI3K/AKT axis and remarkably a novel P2X7-AMPK-PRAS40-mTOR axis. When exposed to high levels of extracellular ATP, these two signaling axes perturb the balance between growth and autophagy, thereby promoting tumor cell death. Conclusions: Our study defines novel molecular mechanisms underpinning the antitumor actions of P2X7 and provides a further rationale for purine-based drugs in targeted cancer therapy.
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页数:14
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