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Koichi Suzuki Cell Regulation Section, Metabolic Diseases Branch, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, Maryland 20892, USA

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Leonard D Kohn Cell Regulation Section, Metabolic Diseases Branch, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, Maryland 20892, USA

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of the thyroid follicular cell, is a potent suppressor of thyroid-specific gene expression, and that this action of Tg overcomes TSH-mediated effects. Thus, it appears that Tg is a feedback suppressor of its own expression, as well as of TPO, NIS and

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Won Bae Kim Edison Biotechnology Institute and College of Osteopathic Medicine, Ohio University, The Ridges, Athens, Ohio 45701, USA
Department of Internal Medicine, Asan Medical Center, University of Ulsan College of Medicine, 388-1 Pungnap-dong, Songpa-gu, Seoul 138-736, South Korea
The Howard Hughes Medical Institute and
The Department of Hematology, University of Washington, Seattle, Washington 98195, USA

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Christopher J Lewis Edison Biotechnology Institute and College of Osteopathic Medicine, Ohio University, The Ridges, Athens, Ohio 45701, USA
Department of Internal Medicine, Asan Medical Center, University of Ulsan College of Medicine, 388-1 Pungnap-dong, Songpa-gu, Seoul 138-736, South Korea
The Howard Hughes Medical Institute and
The Department of Hematology, University of Washington, Seattle, Washington 98195, USA

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Kelly D McCall Edison Biotechnology Institute and College of Osteopathic Medicine, Ohio University, The Ridges, Athens, Ohio 45701, USA
Department of Internal Medicine, Asan Medical Center, University of Ulsan College of Medicine, 388-1 Pungnap-dong, Songpa-gu, Seoul 138-736, South Korea
The Howard Hughes Medical Institute and
The Department of Hematology, University of Washington, Seattle, Washington 98195, USA

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Ramiro Malgor Edison Biotechnology Institute and College of Osteopathic Medicine, Ohio University, The Ridges, Athens, Ohio 45701, USA
Department of Internal Medicine, Asan Medical Center, University of Ulsan College of Medicine, 388-1 Pungnap-dong, Songpa-gu, Seoul 138-736, South Korea
The Howard Hughes Medical Institute and
The Department of Hematology, University of Washington, Seattle, Washington 98195, USA

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Aimee D Kohn Edison Biotechnology Institute and College of Osteopathic Medicine, Ohio University, The Ridges, Athens, Ohio 45701, USA
Department of Internal Medicine, Asan Medical Center, University of Ulsan College of Medicine, 388-1 Pungnap-dong, Songpa-gu, Seoul 138-736, South Korea
The Howard Hughes Medical Institute and
The Department of Hematology, University of Washington, Seattle, Washington 98195, USA

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Randall T Moon Edison Biotechnology Institute and College of Osteopathic Medicine, Ohio University, The Ridges, Athens, Ohio 45701, USA
Department of Internal Medicine, Asan Medical Center, University of Ulsan College of Medicine, 388-1 Pungnap-dong, Songpa-gu, Seoul 138-736, South Korea
The Howard Hughes Medical Institute and
The Department of Hematology, University of Washington, Seattle, Washington 98195, USA

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Leonard D Kohn Edison Biotechnology Institute and College of Osteopathic Medicine, Ohio University, The Ridges, Athens, Ohio 45701, USA
Department of Internal Medicine, Asan Medical Center, University of Ulsan College of Medicine, 388-1 Pungnap-dong, Songpa-gu, Seoul 138-736, South Korea
The Howard Hughes Medical Institute and
The Department of Hematology, University of Washington, Seattle, Washington 98195, USA

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), sodium iodide symporter, and the thyroid-stimulating hormone receptor (TSHR) genes, all of which are under the regulatory control of TSH and insulin/insulin-like growth factor-I (IGF-I). Moreover, the growth of FRTL-5 cells is regulated by several

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Bert De Groef Laboratory of Comparative Endocrinology, K.U. Leuven, Naamsestraat 61, B3000 Leuven, Belgium

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Sylvia V H Grommen Laboratory of Comparative Endocrinology, K.U. Leuven, Naamsestraat 61, B3000 Leuven, Belgium

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Veerle M Darras Laboratory of Comparative Endocrinology, K.U. Leuven, Naamsestraat 61, B3000 Leuven, Belgium

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even more dramatic surge of plasma 3,5,3′-tri-iodothyronine (T 3 ). The underlying cause of augmented TH secretion shortly before hatching is unknown. Some authors have speculated that elevated thyroidal and pituitary sensitivity to thyrotrophin (TSH

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Isabela Teixeira Bonomo Departamento de Ciências Fisiológicas - 5o andar, Departamento de Nutrição Aplicada, Departamento de Fisiologia e Biofísica, Instituto de Biologia Roberto Alcântara Gomes

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Patrícia Cristina Lisboa Departamento de Ciências Fisiológicas - 5o andar, Departamento de Nutrição Aplicada, Departamento de Fisiologia e Biofísica, Instituto de Biologia Roberto Alcântara Gomes

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Magna Cottini Fonseca Passos Departamento de Ciências Fisiológicas - 5o andar, Departamento de Nutrição Aplicada, Departamento de Fisiologia e Biofísica, Instituto de Biologia Roberto Alcântara Gomes

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Simone Bezerra Alves Departamento de Ciências Fisiológicas - 5o andar, Departamento de Nutrição Aplicada, Departamento de Fisiologia e Biofísica, Instituto de Biologia Roberto Alcântara Gomes

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Adelina Martha Reis Departamento de Ciências Fisiológicas - 5o andar, Departamento de Nutrição Aplicada, Departamento de Fisiologia e Biofísica, Instituto de Biologia Roberto Alcântara Gomes

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Egberto Gaspar de Moura Departamento de Ciências Fisiológicas - 5o andar, Departamento de Nutrição Aplicada, Departamento de Fisiologia e Biofísica, Instituto de Biologia Roberto Alcântara Gomes

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, and liver. Thyrotropin (TSH), T 3 , and T 4 serum concentrations TSH was measured by specific RIA, using a kit for rat TSH supplied by the NIDDKD (NIH) and data were expressed in terms of the reference preparation provided (RP-3). The intra

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Michael Muchow
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Ioannis Bossis
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Tom E Porter
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Introduction Thyroid hormones are involved in the regulation of growth, metabolism, heat production, gonadal development, molting, migration, and hatching in birds ( McNabb 2000 ). Thyroid-stimulating hormone (TSH) plays an important

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Patricia C Lisboa Laboratory of Endocrine Physiology, Department of Physiological Sciences, Roberto Alcantara Gomes Biology Institute, State University of Rio de Janeiro, Avenida 28 de setembro, 87, Rio de Janeiro, RJ 20551‐031, Brazil

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Ellen P S Conceição Laboratory of Endocrine Physiology, Department of Physiological Sciences, Roberto Alcantara Gomes Biology Institute, State University of Rio de Janeiro, Avenida 28 de setembro, 87, Rio de Janeiro, RJ 20551‐031, Brazil

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Elaine de Oliveira Laboratory of Endocrine Physiology, Department of Physiological Sciences, Roberto Alcantara Gomes Biology Institute, State University of Rio de Janeiro, Avenida 28 de setembro, 87, Rio de Janeiro, RJ 20551‐031, Brazil

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Egberto G Moura Laboratory of Endocrine Physiology, Department of Physiological Sciences, Roberto Alcantara Gomes Biology Institute, State University of Rio de Janeiro, Avenida 28 de setembro, 87, Rio de Janeiro, RJ 20551‐031, Brazil

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understanding regarding the degree of hypothyroidism previously reported in EO animal models. Because circulating thyrotropin (TSH) was unaltered in adult small litter (SL) rats, we evaluated the thyrotropin release hormone (TRH) in the hypothalamus, the TSH in

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Michelle P Marassi Laboratório de Fisiologia Endócrina, Instituto de Biofísica Carlos Chagas Filho, Universidade Federal do Rio de Janeiro, CCS-Bloco G-Cidade Universitária, Ilha do Fundão, Rio de Janeiro 21949-900, Brazil

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Rodrigo S Fortunato Laboratório de Fisiologia Endócrina, Instituto de Biofísica Carlos Chagas Filho, Universidade Federal do Rio de Janeiro, CCS-Bloco G-Cidade Universitária, Ilha do Fundão, Rio de Janeiro 21949-900, Brazil

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Alba C Matos da Silva Laboratório de Fisiologia Endócrina, Instituto de Biofísica Carlos Chagas Filho, Universidade Federal do Rio de Janeiro, CCS-Bloco G-Cidade Universitária, Ilha do Fundão, Rio de Janeiro 21949-900, Brazil

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Valmara S Pereira Laboratório de Fisiologia Endócrina, Instituto de Biofísica Carlos Chagas Filho, Universidade Federal do Rio de Janeiro, CCS-Bloco G-Cidade Universitária, Ilha do Fundão, Rio de Janeiro 21949-900, Brazil

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Denise P Carvalho Laboratório de Fisiologia Endócrina, Instituto de Biofísica Carlos Chagas Filho, Universidade Federal do Rio de Janeiro, CCS-Bloco G-Cidade Universitária, Ilha do Fundão, Rio de Janeiro 21949-900, Brazil

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Doris Rosenthal Laboratório de Fisiologia Endócrina, Instituto de Biofísica Carlos Chagas Filho, Universidade Federal do Rio de Janeiro, CCS-Bloco G-Cidade Universitária, Ilha do Fundão, Rio de Janeiro 21949-900, Brazil

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Vânia M Corrêa da Costa Laboratório de Fisiologia Endócrina, Instituto de Biofísica Carlos Chagas Filho, Universidade Federal do Rio de Janeiro, CCS-Bloco G-Cidade Universitária, Ilha do Fundão, Rio de Janeiro 21949-900, Brazil

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ascertained ( Donda et al. 1990 ). Cheron et al. (1980) reported lower serum T3 and higher serum thyroid-stimulating hormone (TSH) in adults than in 21- and 30-day-old pre-pubertal male (Pm) rats, without any significant difference in serum T4

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Camila Calvino
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Luana L Souza
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Ricardo H Costa-e-Sousa
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Norma A S Almeida Laboratório de Endocrinologia Molecular, Departamento de Ciências Fisiológicas da Universidade Federal Rural do Rio de Janeiro, Instituto de Biofisica Carlos Chagas Filho, Universidade Federal do Rio de Janeiro, Edificio do Centro de Ciencias da Saude, Bloco G CEP 21941-902, Rio de Janeiro, Brazil

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Isis H Trevenzoli
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Carmen C Pazos-Moura
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TSH concentration in rats, potentially due to leptin action at the hypothalamus, as the direct pituitary effect of leptin on TSH release was inhibitory, potentially as a result of an autocrine–paracrine effect exerted by locally produced leptin

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Juan C Solis-S
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Patricia Villalobos Department of Biomedical Research, Department of Cellular and Molecular Neurobiology, Department of Physiology and Pharmacology, School of Medicine, Autonomous University of Queretaro, Clavel 200, Queretaro, Queretaro 76017, Mexico

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Aurea Orozco Department of Biomedical Research, Department of Cellular and Molecular Neurobiology, Department of Physiology and Pharmacology, School of Medicine, Autonomous University of Queretaro, Clavel 200, Queretaro, Queretaro 76017, Mexico

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Guadalupe Delgado Department of Biomedical Research, Department of Cellular and Molecular Neurobiology, Department of Physiology and Pharmacology, School of Medicine, Autonomous University of Queretaro, Clavel 200, Queretaro, Queretaro 76017, Mexico

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Andres Quintanar-Stephano Department of Biomedical Research, Department of Cellular and Molecular Neurobiology, Department of Physiology and Pharmacology, School of Medicine, Autonomous University of Queretaro, Clavel 200, Queretaro, Queretaro 76017, Mexico

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Pablo Garcia-Solis
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Hebert L Hernandez-Montiel
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Ludivina Robles-Osorio
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Carlos Valverde-R Department of Biomedical Research, Department of Cellular and Molecular Neurobiology, Department of Physiology and Pharmacology, School of Medicine, Autonomous University of Queretaro, Clavel 200, Queretaro, Queretaro 76017, Mexico

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in intact rats reported that TSH administration increases rat tDh (rtDh) activity ( Roche et al . 1953 , Maayan & Rosenberg 1963 ). Similarly, thyroidal ID1 activity ( Erickson et al . 1982 ) and mRNA ( Toyoda et al . 1992 ) are increased by TSH

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Shona Wood Faculty of Life Sciences, University of Manchester, Manchester M13 9PT, UK

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Andrew Loudon Faculty of Life Sciences, University of Manchester, Manchester M13 9PT, UK

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β sub-units of thyroid-stimulating hormone (TSH). These cells lack receptors for the hypothalamic thyrotropin-releasing hormone (TRH) ( Bockmann et al . 1997 ), and do not respond to conventional hypothalamic outputs. In mammals, the MT1 receptor co

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