The P2X7 receptor is a key modulator of the PI3K/GSK3β/VEGF signaling network: evidence in experimental neuroblastoma

Neuroblastoma (NB) is an aggressive pediatric tumor, responsible for 15% of cancer-related deaths in childhood, lacking an effective treatment in its advanced stages. The P2X7 receptor for extracellular ATP was associated to NB cell proliferation and recently emerged as a promoter of tumor engraftme...

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Veröffentlicht in:Oncogene 2015-10, Vol.34 (41), p.5240-5251
Hauptverfasser: Amoroso, F, Capece, M, Rotondo, A, Cangelosi, D, Ferracin, M, Franceschini, A, Raffaghello, L, Pistoia, V, Varesio, L, Adinolfi, E
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container_end_page 5251
container_issue 41
container_start_page 5240
container_title Oncogene
container_volume 34
creator Amoroso, F
Capece, M
Rotondo, A
Cangelosi, D
Ferracin, M
Franceschini, A
Raffaghello, L
Pistoia, V
Varesio, L
Adinolfi, E
description Neuroblastoma (NB) is an aggressive pediatric tumor, responsible for 15% of cancer-related deaths in childhood, lacking an effective treatment in its advanced stages. The P2X7 receptor for extracellular ATP was associated to NB cell proliferation and recently emerged as a promoter of tumor engraftment, growth and vascularization. In an effort to identify new therapeutic options for neuroblastoma, we studied the role of P2X7 receptor in NB biology. We first analyzed the effect of P2X7 activation or down-modulation of the main biochemical ways involved in NB progression: the PI3K/Akt/GSK3β/MYCN and the HIF1α/VEGF pathways. In ACN human NB cells, P2X7 stimulation enhanced PI3K/Akt, while decreasing GSK3β activity. In the same model, P2X7 silencing or antagonist administration reduced the activity of PI3K/Akt and increased that of GSK3β, leading to a decrease in cellular glycogen stores. Similarly, P2X7 downmodulation caused a reduction in HIF1α levels and vascular endothelial growth factor (VEGF) secretion. Systemic administration of two different P2X7 antagonists (AZ10606120 or A740003) in nude/nude mice reduced ACN-derived tumor growth. An even stronger effect of P2X7 blockade was obtained in a syngeneic immune-competent neuroblastoma model: Neuro2A cells injected in AlbinoJ mice. Together with tumor regression, treatment with P2X7 antagonists caused downmodulation of the Akt/HIF1α axis, leading to reduced VEGF content and decreased vessel formation. Interestingly, in both experimental models, P2X7 antagonists strongly reduced the expression of the probably best-accepted oncogene in NB: MYCN . Finally, we associated P2X7 overexpression with poor prognosis in advanced-stage NB patients. Taken together, our data suggest that P2X7 receptor is an upstream regulator of the main signaling pathways involved in NB growth, metabolic activity and angiogenesis, and a promising therapeutic target for neuroblastoma treatment.
doi_str_mv 10.1038/onc.2014.444
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An even stronger effect of P2X7 blockade was obtained in a syngeneic immune-competent neuroblastoma model: Neuro2A cells injected in AlbinoJ mice. Together with tumor regression, treatment with P2X7 antagonists caused downmodulation of the Akt/HIF1α axis, leading to reduced VEGF content and decreased vessel formation. Interestingly, in both experimental models, P2X7 antagonists strongly reduced the expression of the probably best-accepted oncogene in NB: MYCN . Finally, we associated P2X7 overexpression with poor prognosis in advanced-stage NB patients. 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An even stronger effect of P2X7 blockade was obtained in a syngeneic immune-competent neuroblastoma model: Neuro2A cells injected in AlbinoJ mice. Together with tumor regression, treatment with P2X7 antagonists caused downmodulation of the Akt/HIF1α axis, leading to reduced VEGF content and decreased vessel formation. Interestingly, in both experimental models, P2X7 antagonists strongly reduced the expression of the probably best-accepted oncogene in NB: MYCN . Finally, we associated P2X7 overexpression with poor prognosis in advanced-stage NB patients. 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The P2X7 receptor for extracellular ATP was associated to NB cell proliferation and recently emerged as a promoter of tumor engraftment, growth and vascularization. In an effort to identify new therapeutic options for neuroblastoma, we studied the role of P2X7 receptor in NB biology. We first analyzed the effect of P2X7 activation or down-modulation of the main biochemical ways involved in NB progression: the PI3K/Akt/GSK3β/MYCN and the HIF1α/VEGF pathways. In ACN human NB cells, P2X7 stimulation enhanced PI3K/Akt, while decreasing GSK3β activity. In the same model, P2X7 silencing or antagonist administration reduced the activity of PI3K/Akt and increased that of GSK3β, leading to a decrease in cellular glycogen stores. Similarly, P2X7 downmodulation caused a reduction in HIF1α levels and vascular endothelial growth factor (VEGF) secretion. Systemic administration of two different P2X7 antagonists (AZ10606120 or A740003) in nude/nude mice reduced ACN-derived tumor growth. An even stronger effect of P2X7 blockade was obtained in a syngeneic immune-competent neuroblastoma model: Neuro2A cells injected in AlbinoJ mice. Together with tumor regression, treatment with P2X7 antagonists caused downmodulation of the Akt/HIF1α axis, leading to reduced VEGF content and decreased vessel formation. Interestingly, in both experimental models, P2X7 antagonists strongly reduced the expression of the probably best-accepted oncogene in NB: MYCN . Finally, we associated P2X7 overexpression with poor prognosis in advanced-stage NB patients. Taken together, our data suggest that P2X7 receptor is an upstream regulator of the main signaling pathways involved in NB growth, metabolic activity and angiogenesis, and a promising therapeutic target for neuroblastoma treatment.</abstract><cop>London</cop><pub>Nature Publishing Group UK</pub><pmid>25619831</pmid><doi>10.1038/onc.2014.444</doi><tpages>12</tpages><orcidid>https://orcid.org/0000-0002-1595-6887</orcidid><orcidid>https://orcid.org/0000-0001-8129-9929</orcidid><oa>free_for_read</oa></addata></record>
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language eng
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subjects 1-Phosphatidylinositol 3-kinase
13/89
631/67/2332
64
64/60
82/29
82/80
96
96/1
96/95
AKT protein
Angiogenesis
Animals
Apoptosis
Cell Biology
Cell Line, Tumor
Cell Proliferation
Cellular signal transduction
Children
Development and progression
Female
Genetic aspects
Glycogen
Glycogen Synthase Kinase 3 - metabolism
Glycogen Synthase Kinase 3 beta
Health aspects
Human Genetics
Humans
Hypoxia-Inducible Factor 1, alpha Subunit - metabolism
Innovations
Internal Medicine
Medicine
Medicine & Public Health
Mice, Nude
Molecular targeted therapy
Neoplasm Transplantation
Neuroblastoma
Neuroblastoma - metabolism
Oncology
original-article
Phosphatidylinositol 3-Kinases - metabolism
Receptors, Purinergic P2X7 - physiology
Signal Transduction
Therapeutic applications
Vascular endothelial growth factor
Vascular Endothelial Growth Factor A - metabolism
Vascularization
title The P2X7 receptor is a key modulator of the PI3K/GSK3β/VEGF signaling network: evidence in experimental neuroblastoma
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