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Dolly Thomas Department of Medicine, Department of Molecular, The Leon D. Black Family Stem Cell Institute, Mount Sinai School of Medicine, Box 1055, One Gustave L. Levy Place, New York, New York 10029, USA

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Susan Friedman Department of Medicine, Department of Molecular, The Leon D. Black Family Stem Cell Institute, Mount Sinai School of Medicine, Box 1055, One Gustave L. Levy Place, New York, New York 10029, USA

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Reigh-Yi Lin Department of Medicine, Department of Molecular, The Leon D. Black Family Stem Cell Institute, Mount Sinai School of Medicine, Box 1055, One Gustave L. Levy Place, New York, New York 10029, USA
Department of Medicine, Department of Molecular, The Leon D. Black Family Stem Cell Institute, Mount Sinai School of Medicine, Box 1055, One Gustave L. Levy Place, New York, New York 10029, USA
Department of Medicine, Department of Molecular, The Leon D. Black Family Stem Cell Institute, Mount Sinai School of Medicine, Box 1055, One Gustave L. Levy Place, New York, New York 10029, USA
Department of Medicine, Department of Molecular, The Leon D. Black Family Stem Cell Institute, Mount Sinai School of Medicine, Box 1055, One Gustave L. Levy Place, New York, New York 10029, USA

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thyroid stem cells has been largely unstudied. This discrepancy may be due to the availability of an effective, economical, standardized, and well-tolerated hormone replacement therapy for hypothyroidism. The recent identification and characterization of

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Fiorenza Gianì Endocrinology, Department of Clinical and Experimental Medicine, University of Catania, Garibaldi-Nesima Medical Center, Catania, Italy

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Giuseppe Pandini Endocrinology, Department of Clinical and Experimental Medicine, University of Catania, Garibaldi-Nesima Medical Center, Catania, Italy

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Nunzio Massimo Scalisi Endocrinology, Department of Clinical and Experimental Medicine, University of Catania, Garibaldi-Nesima Medical Center, Catania, Italy

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Paolo Vigneri Medical Oncology and Center of Experimental Oncology and Hematology, Department of Clinical and Experimental Medicine, University of Catania, A.O.U Policlinico Vittorio Emanuele, Catania, Italy

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Carmine Fazzari Humanitas, Catania Oncology Center, Catania, Italy

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Pasqualino Malandrino Endocrinology, Department of Clinical and Experimental Medicine, University of Catania, Garibaldi-Nesima Medical Center, Catania, Italy

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Marco Russo Endocrinology, Department of Clinical and Experimental Medicine, University of Catania, Garibaldi-Nesima Medical Center, Catania, Italy

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Romilda Masucci Surgical Oncology, Garibaldi-Nesima Medical Center, Catania, Italy

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Antonino Belfiore Endocrinology, Department of Clinical and Experimental Medicine, University of Catania, Garibaldi-Nesima Medical Center, Catania, Italy

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Gwabriella Pellegriti Endocrinology, Department of Clinical and Experimental Medicine, University of Catania, Garibaldi-Nesima Medical Center, Catania, Italy

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Riccardo Vigneri Endocrinology, Department of Clinical and Experimental Medicine, University of Catania, Garibaldi-Nesima Medical Center, Catania, Italy
IC Crystallography Institute, National Research Council, CNR, Catania, Italy

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Thyroid cancer incidence is increased in volcanic areas where environment pollution biocontaminates residents. Tungsten (W) is the most increased heavy metal in drinking water of Mount Etna volcanic area where it exceeds the normal range in the urine of 27% inhabitants. The possible connection between increased tungsten and thyroid cancer has never been studied. We investigated in vitro the effect tungsten on both human thyrocytes in primary culture, thyrospheres (aggregates of stem/precursor thyroid cells) and thyrocytes differentiated from tungsten-exposed thyrospheres. Chronic exposure to low-dose (nanomolar range, as in the urines of volcanic area residents) soluble tungsten had major biological effects on thyroid stem/precursor cells, promoting growth with a biphasic (hormetic) dose-response and reducing apoptosis. No such effects were observed in mature thyrocytes. In addition, tungsten-exposed thyrospheres had abnormal expression of genes commonly altered also in thyroid cancer and increased activation of the DNA-repair proteins H2AX and 53BP1. Moreover, exposure to tungsten decreased thyrosphere differentiation, as indicated by the reduced expression of thyroid-specific genes in derived thyrocytes that also showed preneoplastic changes such as increased anchorage-independent growth, clonogenic growth and migration capacity. The mechanism of action of tungsten on thyroid stem/precursor cells is unclear but involves membrane G-proteins and activation of the ERK signaling pathway. These data indicate that chronic exposure to slightly increased tungsten, harmless for mature thyrocytes, importantly affects the biology of stem/precursor thyroid cells and of their progeny, inducing characteristics of preneoplastic transformation.

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John E Phay Division of Surgical Oncology, Division of Endocrinology, Department of Surgery

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Matthew D Ringel Division of Surgical Oncology, Division of Endocrinology, Department of Surgery

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response to injury and therefore can be either quiescent or cycling, depending on the need of the organ. Adult thyroid stem cells have long been posited ( Dumont et al . 1992 ), but human thyroid follicular cells are estimated to have a turnover rate of ∼8

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Caterina Tiozzo Developmental Biology Program, Department of Pediatrics, Department of Pediatrics, Department of Pediatrics, Division of Cell Biology, Department of Developmental and Molecular Biology, Department of Internal Medicine II, Saban Research Institute of Childrens Hospital Los Angeles, Los Angeles, California 90027, USA
Developmental Biology Program, Department of Pediatrics, Department of Pediatrics, Department of Pediatrics, Division of Cell Biology, Department of Developmental and Molecular Biology, Department of Internal Medicine II, Saban Research Institute of Childrens Hospital Los Angeles, Los Angeles, California 90027, USA
Developmental Biology Program, Department of Pediatrics, Department of Pediatrics, Department of Pediatrics, Division of Cell Biology, Department of Developmental and Molecular Biology, Department of Internal Medicine II, Saban Research Institute of Childrens Hospital Los Angeles, Los Angeles, California 90027, USA

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Soula Danopoulos Developmental Biology Program, Department of Pediatrics, Department of Pediatrics, Department of Pediatrics, Division of Cell Biology, Department of Developmental and Molecular Biology, Department of Internal Medicine II, Saban Research Institute of Childrens Hospital Los Angeles, Los Angeles, California 90027, USA

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Maria Lavarreda-Pearce Developmental Biology Program, Department of Pediatrics, Department of Pediatrics, Department of Pediatrics, Division of Cell Biology, Department of Developmental and Molecular Biology, Department of Internal Medicine II, Saban Research Institute of Childrens Hospital Los Angeles, Los Angeles, California 90027, USA

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Sheryl Baptista Developmental Biology Program, Department of Pediatrics, Department of Pediatrics, Department of Pediatrics, Division of Cell Biology, Department of Developmental and Molecular Biology, Department of Internal Medicine II, Saban Research Institute of Childrens Hospital Los Angeles, Los Angeles, California 90027, USA

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Radka Varimezova Developmental Biology Program, Department of Pediatrics, Department of Pediatrics, Department of Pediatrics, Division of Cell Biology, Department of Developmental and Molecular Biology, Department of Internal Medicine II, Saban Research Institute of Childrens Hospital Los Angeles, Los Angeles, California 90027, USA

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Denise Al Alam Developmental Biology Program, Department of Pediatrics, Department of Pediatrics, Department of Pediatrics, Division of Cell Biology, Department of Developmental and Molecular Biology, Department of Internal Medicine II, Saban Research Institute of Childrens Hospital Los Angeles, Los Angeles, California 90027, USA

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David Warburton Developmental Biology Program, Department of Pediatrics, Department of Pediatrics, Department of Pediatrics, Division of Cell Biology, Department of Developmental and Molecular Biology, Department of Internal Medicine II, Saban Research Institute of Childrens Hospital Los Angeles, Los Angeles, California 90027, USA

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Rehan Virender Developmental Biology Program, Department of Pediatrics, Department of Pediatrics, Department of Pediatrics, Division of Cell Biology, Department of Developmental and Molecular Biology, Department of Internal Medicine II, Saban Research Institute of Childrens Hospital Los Angeles, Los Angeles, California 90027, USA

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Stijn De Langhe Developmental Biology Program, Department of Pediatrics, Department of Pediatrics, Department of Pediatrics, Division of Cell Biology, Department of Developmental and Molecular Biology, Department of Internal Medicine II, Saban Research Institute of Childrens Hospital Los Angeles, Los Angeles, California 90027, USA

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Antonio Di Cristofano Developmental Biology Program, Department of Pediatrics, Department of Pediatrics, Department of Pediatrics, Division of Cell Biology, Department of Developmental and Molecular Biology, Department of Internal Medicine II, Saban Research Institute of Childrens Hospital Los Angeles, Los Angeles, California 90027, USA

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Saverio Bellusci Developmental Biology Program, Department of Pediatrics, Department of Pediatrics, Department of Pediatrics, Division of Cell Biology, Department of Developmental and Molecular Biology, Department of Internal Medicine II, Saban Research Institute of Childrens Hospital Los Angeles, Los Angeles, California 90027, USA
Developmental Biology Program, Department of Pediatrics, Department of Pediatrics, Department of Pediatrics, Division of Cell Biology, Department of Developmental and Molecular Biology, Department of Internal Medicine II, Saban Research Institute of Childrens Hospital Los Angeles, Los Angeles, California 90027, USA

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Parviz Minoo Developmental Biology Program, Department of Pediatrics, Department of Pediatrics, Department of Pediatrics, Division of Cell Biology, Department of Developmental and Molecular Biology, Department of Internal Medicine II, Saban Research Institute of Childrens Hospital Los Angeles, Los Angeles, California 90027, USA
Developmental Biology Program, Department of Pediatrics, Department of Pediatrics, Department of Pediatrics, Division of Cell Biology, Department of Developmental and Molecular Biology, Department of Internal Medicine II, Saban Research Institute of Childrens Hospital Los Angeles, Los Angeles, California 90027, USA

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homeostasis is thought to be maintained by a distinct pool of stem cells present in the adult thyroid gland. At least two types of thyroid stem cells have been described in the literature: the progenitor of follicular cells and the progenitor of C cells

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Michael Derwahl Department of Medicine, St Hedwig Hospital and Charite, University Medicine Berlin, Grosse Hamburger Straße 5‐11, 10115 Berlin, Germany

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Diana Nicula Department of Medicine, St Hedwig Hospital and Charite, University Medicine Berlin, Grosse Hamburger Straße 5‐11, 10115 Berlin, Germany

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addition, in thyroid cancer, the PI3K/Akt pathway may also be activated by mutational inactivation of PTEN , a tumor-suppressor gene, or decreased/ absent expression of its mRNA or protein ( Bruni et al . 2000 ). Estrogen and thyroid stem cells There is

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Zhenying Guo Department of Pathology and Laboratory Medicine, University of Wisconsin School of Medicine and Public Health, Zhejiang, China

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Heather Hardin Department of Pathology and Laboratory Medicine, University of Wisconsin School of Medicine and Public Health, Zhejiang, China

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Ricardo V Lloyd Department of Pathology and Laboratory Medicine, University of Wisconsin School of Medicine and Public Health, Zhejiang, China

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is combined with conventional therapy it may be possible to eradicate even highly lethal cancers such as anaplastic thyroid carcinomas. Thyroid stem cells and CSCs identification The precise tissue microenvironment of thyroid CSCs remains unknown

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Dang Vu-Phan Cellular and Molecular Biology Graduate Program, Division of Metabolism, Department of Comparative Medicine, Division of Hematology and Oncology, Endocrinology and Diabetes, Department of Internal Medicine, University of Michigan Medical Center, Ann Arbor, Michigan 48109, USA

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Vladimir Grachtchouk Cellular and Molecular Biology Graduate Program, Division of Metabolism, Department of Comparative Medicine, Division of Hematology and Oncology, Endocrinology and Diabetes, Department of Internal Medicine, University of Michigan Medical Center, Ann Arbor, Michigan 48109, USA

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Jingcheng Yu Cellular and Molecular Biology Graduate Program, Division of Metabolism, Department of Comparative Medicine, Division of Hematology and Oncology, Endocrinology and Diabetes, Department of Internal Medicine, University of Michigan Medical Center, Ann Arbor, Michigan 48109, USA

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Lesley A Colby Cellular and Molecular Biology Graduate Program, Division of Metabolism, Department of Comparative Medicine, Division of Hematology and Oncology, Endocrinology and Diabetes, Department of Internal Medicine, University of Michigan Medical Center, Ann Arbor, Michigan 48109, USA

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Max S Wicha Cellular and Molecular Biology Graduate Program, Division of Metabolism, Department of Comparative Medicine, Division of Hematology and Oncology, Endocrinology and Diabetes, Department of Internal Medicine, University of Michigan Medical Center, Ann Arbor, Michigan 48109, USA

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Ronald J Koenig Cellular and Molecular Biology Graduate Program, Division of Metabolism, Department of Comparative Medicine, Division of Hematology and Oncology, Endocrinology and Diabetes, Department of Internal Medicine, University of Michigan Medical Center, Ann Arbor, Michigan 48109, USA

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subpopulation of thyroid cancer cells are promising tools for future use in the study of thyroid stem cells and cancer. The mechanism of Wnt/TCF pathway activation by PPFP is unclear, except that it requires the PPARG DBD within PPFP. Activation of this pathway

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Elena Stauffer Helmholtz Zentrum München – German Research Center for Environmental Health, Research Unit Radiation Cytogenetics, Neuherberg, Germany

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Peter Weber Helmholtz Zentrum München – German Research Center for Environmental Health, Research Unit Radiation Cytogenetics, Neuherberg, Germany

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Theresa Heider Helmholtz Zentrum München – German Research Center for Environmental Health, Research Unit Radiation Cytogenetics, Neuherberg, Germany

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Claudia Dalke Helmholtz Zentrum München – German Research Center for Environmental Health, Institute of Metabolism and Cell Death, Neuherberg, Germany

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Andreas Blutke Helmholtz Zentrum München – German Research Center for Environmental Health, Research Unit Analytical Pathology, Neuherberg, Germany

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Axel Walch Helmholtz Zentrum München – German Research Center for Environmental Health, Research Unit Analytical Pathology, Neuherberg, Germany

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Gerald Burgstaller Helmholtz Zentrum München – Institute of Lung Biology and Disease (ILBD) and Comprehensive Pneumology Center (CPC), Member of the German Center for Lung Research (DZL), Munich, Germany

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Nikko Brix Department of Radiation Oncology, University Hospital, LMU Munich, Munich, Germany

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Kirsten Lauber Department of Radiation Oncology, University Hospital, LMU Munich, Munich, Germany
Helmholtz Zentrum München – German Research Center for Environmental Health GmbH, Clinical Cooperation Group ‘Personalized Radiotherapy in Head and Neck Cancer’, Neuherberg, Germany

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Horst Zitzelsberger Helmholtz Zentrum München – German Research Center for Environmental Health, Research Unit Radiation Cytogenetics, Neuherberg, Germany
Helmholtz Zentrum München – German Research Center for Environmental Health GmbH, Clinical Cooperation Group ‘Personalized Radiotherapy in Head and Neck Cancer’, Neuherberg, Germany

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Kristian Unger Helmholtz Zentrum München – German Research Center for Environmental Health, Research Unit Radiation Cytogenetics, Neuherberg, Germany
Department of Radiation Oncology, University Hospital, LMU Munich, Munich, Germany
Helmholtz Zentrum München – German Research Center for Environmental Health GmbH, Clinical Cooperation Group ‘Personalized Radiotherapy in Head and Neck Cancer’, Neuherberg, Germany

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Martin Selmansberger Helmholtz Zentrum München – German Research Center for Environmental Health, Research Unit Radiation Cytogenetics, Neuherberg, Germany

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Ukraine (1998–2000) . American Journal of Epidemiology 167 305 – 312 . ( https://doi.org/10.1093/aje/kwm301 ) Zane M Scavo E Catalano V Bonanno M Todaro M De Maria R Stassi G 2016 Normal vs cancer thyroid stem cells: the road to

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Amruta Ashtekar Department of Cancer Biology and Genetics, The Ohio State University, Columbus, Ohio, USA

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Danielle Huk Department of Cancer Biology and Genetics, The Ohio State University, Columbus, Ohio, USA

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Alexa Magner Department of Cancer Biology and Genetics, The Ohio State University, Columbus, Ohio, USA

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Krista La Perle Department of Veterinary Biosciences and Comparative Pathology & Mouse Phenotyping Shared Resource, The Ohio State University, Columbus, Ohio, USA

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Xiaoli Zhang Department of Biostatistics, The Ohio State University, Columbus, Ohio, USA

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José I Piruat Instituto de Biomedicina de Sevilla (IBiS), Hospital Universitario Virgen del Rocío CSIC Universidad de Sevilla, Seville, Spain

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José López-Barneo Instituto de Biomedicina de Sevilla (IBiS), Hospital Universitario Virgen del Rocío CSIC Universidad de Sevilla, Seville, Spain

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Sissy M Jhiang Department of Physiology and Cell Biology, The Ohio State University, Columbus, Ohio, USA

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Lawrence S Kirschner Department of Cancer Biology and Genetics, The Ohio State University, Columbus, Ohio, USA
Division of Endocrinology, Diabetes, and Metabolism, Department of Internal Medicine, The Ohio State University, Columbus, Ohio, USA

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transcription factors and cellular production of the thyroid stem cell marker ALDH. Although the tumor cells retained sufficiently differentiated function to maintain normal thyroid function, the acquisition of stem-like features is likely to play an important

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