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Section of Endocrinology, Laboratorio in Rete del Tecnopolo ‘Tecnologie delle Terapie Avanzate’ (LTTA), Department of Cardiological, Department of Morphology, Department of Medical Sciences, University of Ferrara, Via Savonarola 9, 44121 Ferrara, Italy
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Section of Endocrinology, Laboratorio in Rete del Tecnopolo ‘Tecnologie delle Terapie Avanzate’ (LTTA), Department of Cardiological, Department of Morphology, Department of Medical Sciences, University of Ferrara, Via Savonarola 9, 44121 Ferrara, Italy
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Section of Endocrinology, Laboratorio in Rete del Tecnopolo ‘Tecnologie delle Terapie Avanzate’ (LTTA), Department of Cardiological, Department of Morphology, Department of Medical Sciences, University of Ferrara, Via Savonarola 9, 44121 Ferrara, Italy
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. 2011 ), providing the basis for the development of specific mTOR inhibitors as new therapeutic tools for NETs ( Dong et al . 2012 ), including BCs ( Dong & Yao 2011 ). Despite their potential efficacy as anticancer agents, mTOR inhibitors have
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target of rapamycin (mTOR) inhibitors are emerging among the new targeted therapies as powerful tools in NET medical therapy. mTOR is a serine/threonine protein kinase found in two major complexes: mTORC1 and mTORC2. mTORC1 is sensitive to the inhibition
Division of Endocrinology, Department of Molecular and Clinical Endocrinology and Oncology, Department of Internal Medicine, Room Ee530b, Erasmus MC, Dr Molewaterplein 50, 3015 GE Rotterdam, The Netherlands
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et al . 2010 ). mTOR inhibitors may exert their antitumor effects directly by inhibiting cell growth and proliferation and indirectly by inhibiting tumor angiogenesis ( Guertin & Sabatini 2007 , LoPiccolo et al . 2008 ). Presently, many clinical
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responsiveness to mTOR inhibitors ( Righi et al . 2010 , Qian et al. 2013 , Zatelli et al . 2016 ). The mTOR inhibitor has recently shown antitumor activity in advanced, well-differentiated and moderately differentiated P-NETs ( Yao et al . 2011 ), but
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The mammalian target of rapamycin (mTOR) is a central regulator of G1 cell cycle protein synthesis that precedes commitment to normal cellular replication. We have studied the effect of cell cycle inhibitor-779 (CCI-779), a rapamycin ester that inhibits mTOR function, on the proliferation of a panel of breast cancer cell lines. Six of eight lines studied were sensitive (IC(50)< or = 50 nM) and two lines were resistant (IC(50)>1.0 microM) to CCI-779. Sensitive lines were estrogen dependent (MCF-7, BT-474, T-47D), or lacked expression of the tumor suppressor PTEN (MDA-MB-468, BT-549), and/or overexpressed the Her-2/neu oncogene (SKBR-3, BT-474). Resistant lines (MDA-MB-435, MDA-MB-231) shared none of these properties. CCI-779 (50 nM) inhibited mTOR function in both a sensitive and a resistant line. In nu/nu mouse xenografts, CCI-779 inhibited growth of MDA-MB-468 (sensitive) but not MDA-MB-435 resistant tumors. Treatment of sensitive lines with CCI-779 resulted in a decrease in D-type cyclin and c-myc levels and an increase in p27(kip-1) levels. There was good correlation between activation of the Akt pathway and sensitivity to CCI-779. Amplification of mTOR-regulated p70S6 kinase, which is downstream of Akt, may also have conferred CCI-779 sensitivity to MCF-7 cells. Taken together, the data suggest that mTOR may be a good target for breast cancer therapy, especially in tumors with Akt activation resulting from either growth factor dependency or loss of PTEN function.
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growth factor (VEGF) pathway, and inhibitors of the mammalian target of rapamycin (mTOR), which have shown promising activity in recent clinical studies ( Duran et al . 2007 , Kulke 2007 , Yao et al . 2008 , 2010 ). mTOR is a serine threonine kinase
Institute of Pathology, Department of Internal Medicine, Department of Pathology, Institute of Pathology, Institute of Pathology, Institute of Pathology, Charité Universitätsmedizin, Berlin, Germany
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Institute of Pathology, Department of Internal Medicine, Department of Pathology, Institute of Pathology, Institute of Pathology, Institute of Pathology, Charité Universitätsmedizin, Berlin, Germany
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Institute of Pathology, Department of Internal Medicine, Department of Pathology, Institute of Pathology, Institute of Pathology, Institute of Pathology, Charité Universitätsmedizin, Berlin, Germany
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( Modlin et al . 2008 ), therefore novel treatment strategies for these tumours are still urgently needed. Recently, the mammalian target of rapamycin (mTOR) inhibitors temsirolimus ( Rini 2008 ) and everolimus ( Sánchez-Fructuoso 2008 ) have entered late
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Human Oncology and Pathogenesis Program, Department of Medicine, Department of Pathology
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Human Oncology and Pathogenesis Program, Department of Medicine, Department of Pathology
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also has effects on mammalian target of rapamycin (mTOR), has been shown to inhibit growth and induce apoptosis of the MTC cell line TT ( Kunnimalaiyaan et al . 2006 , Ball et al . 2007 ). Recently, novel natural compounds called withanolides have
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pathway inhibitors as single agents or in combination with other agents in the currently evolving treatment landscape of CRPC. The PI3K/Akt/mTOR signaling pathway The PI3K/Akt/mTOR signaling pathway has a diverse array of functions, including the
Department of Public Health and Cell Biology, Laboratory of Neuroembryology, Digestive and Liver Disease Unit, Department of Clinical and Molecular Medicine, ARC‐NET Research Center, Department of Pathology, University of Rome Tor Vergata, Via Montpellier 1, 00133 Rome, Italy
Department of Public Health and Cell Biology, Laboratory of Neuroembryology, Digestive and Liver Disease Unit, Department of Clinical and Molecular Medicine, ARC‐NET Research Center, Department of Pathology, University of Rome Tor Vergata, Via Montpellier 1, 00133 Rome, Italy
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Department of Public Health and Cell Biology, Laboratory of Neuroembryology, Digestive and Liver Disease Unit, Department of Clinical and Molecular Medicine, ARC‐NET Research Center, Department of Pathology, University of Rome Tor Vergata, Via Montpellier 1, 00133 Rome, Italy
Department of Public Health and Cell Biology, Laboratory of Neuroembryology, Digestive and Liver Disease Unit, Department of Clinical and Molecular Medicine, ARC‐NET Research Center, Department of Pathology, University of Rome Tor Vergata, Via Montpellier 1, 00133 Rome, Italy
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Department of Public Health and Cell Biology, Laboratory of Neuroembryology, Digestive and Liver Disease Unit, Department of Clinical and Molecular Medicine, ARC‐NET Research Center, Department of Pathology, University of Rome Tor Vergata, Via Montpellier 1, 00133 Rome, Italy
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Department of Public Health and Cell Biology, Laboratory of Neuroembryology, Digestive and Liver Disease Unit, Department of Clinical and Molecular Medicine, ARC‐NET Research Center, Department of Pathology, University of Rome Tor Vergata, Via Montpellier 1, 00133 Rome, Italy
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Department of Public Health and Cell Biology, Laboratory of Neuroembryology, Digestive and Liver Disease Unit, Department of Clinical and Molecular Medicine, ARC‐NET Research Center, Department of Pathology, University of Rome Tor Vergata, Via Montpellier 1, 00133 Rome, Italy
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Department of Public Health and Cell Biology, Laboratory of Neuroembryology, Digestive and Liver Disease Unit, Department of Clinical and Molecular Medicine, ARC‐NET Research Center, Department of Pathology, University of Rome Tor Vergata, Via Montpellier 1, 00133 Rome, Italy
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factor eIF4B and the translation inhibitor 4E-BP1 ( Hay & Sonenberg 2004 ). The implication of mTOR in proliferation control has stimulated studies aimed at interfering with its activity in cancer cells ( Meric-Bernstam & Gonzalez-Angulo 2009