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Thyroid hormones

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https://www.readbyqxmd.com/read/27913611/silent-somatotroph-tumour-revisited-from-a-study-of-80-patients-with-and-without-acromegaly-and-a-review-of-the-literature
#1
Laura Chinezu, Alexandre Vasiljevic, Jacqueline Trouillas, Marion Lapoirie, Emmanuel Jouanneau, Gérald Raverot
BACKGROUND: Silent somatotroph tumours are growth hormone (GH) immunoreactive (IR) pituitary tumours without clinical and biological signs of acromegaly. Their better characterisation is required to improve the diagnosis. MATERIALS AND METHODS: Twenty-one silent somatotroph tumours were compared to 59 somatotroph tumours with acromegaly. Tumours in each group were classified into GH and plurihormonal (GH/prolactin (PRL)/±thyroid-stimulating hormone (TSH)) and into densely granulated (DG) and sparsely granulated (SG) types...
February 2017: European Journal of Endocrinology
https://www.readbyqxmd.com/read/27913573/thyroid-hormones-induce-browning-of-white-fat
#2
Noelia Martinez, José María Moreno-Navarrete, Cristina Contreras, Eva Rial-Pensado, Johan Fernø, Rubén Nogueiras, Carlos Diéguez, José M Fernández-Real, Miguel López
The canonical view about the effect of thyroid hormones (THs) on thermogenesis assumes that the hypothalamus acts merely as a modulator of the sympathetic outflow on brown adipose tissue (BAT). Recent data have challenged that vision by demonstrating that THs act on the ventromedial nucleus of the hypothalamus (VMH) to inhibit AMP-activated protein kinase (AMPK), which regulates the thermogenic program in BAT, leading to increased thermogenesis and weight loss. Current data have shown that in addition to activation of brown fat, the browning of white adipose tissue (WAT) might be also an important thermogenic mechanism...
December 2, 2016: Journal of Endocrinology
https://www.readbyqxmd.com/read/27912200/is-cha2ds2-vasc-appropriate-for-hyperthyroid-patients-with-atrial-fibrillation-implications-of-adding-a-transesophageal-echocardiography-evaluation
#3
Marcus Vinicius Leitão de Souza, Patricia de Fátima Dos Santos Teixeira, Mario Vaisman, Sergio Salles Xavier
BACKGROUND: Anticoagulation remains a controversial issue among hyperthyroid patients with atrial fibrillation (AF). We aimed to evaluate the prevalence of the thrombogenic milieu (TM), detected using transesophageal echocardiography (TEE), among patients with AF related to hyperthyroidism, and to correlate these findings with the clinical embolic risk classification (CHA2DS2-VASc). METHODS: CHA2DS2-VASc score, thyroid hormonal status, time since hyperthyroidism diagnosis, transthoracic echocardiography (TTE) and TEE were assessed in 47 consecutive patients aged between 18 and 65years with AF related to hyperthyroidism...
November 10, 2016: International Journal of Cardiology
https://www.readbyqxmd.com/read/27911598/type-3-deiodinase-role-on-central-thyroid-hormone-action-affects-the-leptin-melanocortin-system-and-circadian-activity
#4
Zhaofei Wu, M Elena Martinez, Donald L St Germain, Arturo Hernandez
The role of thyroid hormones (TH) in the central regulation of energy balance is increasingly appreciated. Mice lacking the type 3 deiodinase (DIO3), which inactivates TH, have decreased circulating TH levels relative to control mice due to defects in the hypothalamic-pituitary-thyroid axis. However, we have shown that the TH status of the adult Dio3(-/-) brain is opposite that of the serum, exhibiting enhanced levels of TH action. Since the brain, specially the hypothalamus, harbors important circuitries that regulate metabolism, we aimed to examine the energy balance phenotype of Dio3(-/-) mice and determine whether it is associated with hypothalamic abnormalities...
December 2, 2016: Endocrinology
https://www.readbyqxmd.com/read/27910710/management-of-a-pregnant-woman-with-thyrotropinoma-a-case-report-and-review-of-the-literature
#5
Carolina M Perdomo, Jorge A Árabe, Miguel Á Idoate, Juan C Galofré
INTRODUCTION: Pituitary disorders during pregnancy are uncommon. The approach should include a close follow-up in order to reduce maternal and fetal risks associated with physiological changes during pregnancy or treatment side effects. MATERIALS AND METHODS: We report a 21-year-old woman with a thyroid-stimulating hormone-secreting pituitary macroadenoma and positive antithyroid antibodies. She was initially treated using transsphenoidal pituitary surgery. The patient relapsed 17-month post-surgery...
December 2, 2016: Gynecological Endocrinology
https://www.readbyqxmd.com/read/27908417/biphasic-action-of-iodine-in-excess-at-different-doses-on-ovary-in-adult-rats
#6
Dakshayani Mahapatra, Amar K Chandra
Iodine consumption in excess of its recommended levels over a prolonged period of time is well known to cause thyroid disorders. The thyroid hormones on the other hand are responsible in maintenance of the physiology of the reproductive system. Excess iodine intake affects male reproductive physiology. However, the effects of excess iodine on the ovarian structure and function is yet to be established. The present study has thus been undertaken to investigate the effect of excess iodine on the ovarian physiology...
January 2017: Journal of Trace Elements in Medicine and Biology
https://www.readbyqxmd.com/read/27908169/flexible-mini-gamma-camera-reconstructions-of-extended-sources-using-step-and-shoot-and-list-mode
#7
José Gardiazabal, Philipp Matthies, Jakob Vogel, Benjamin Frisch, Nassir Navab, Sibylle Ziegler, Tobias Lasser
PURPOSE: Hand- and robot-guided mini gamma cameras have been introduced for the acquisition of single-photon emission computed tomography (SPECT) images. Less cumbersome than whole-body scanners, they allow for a fast acquisition of the radioactivity distribution, for example, to differentiate cancerous from hormonally hyperactive lesions inside the thyroid. This work compares acquisition protocols and reconstruction algorithms in an attempt to identify the most suitable approach for fast acquisition and efficient image reconstruction, suitable for localization of extended sources, such as lesions inside the thyroid...
December 2016: Medical Physics
https://www.readbyqxmd.com/read/27907809/does-exposure-to-phthalates-influence-thyroid-function-and-growth-hormone-homeostasis-the-taiwan-environmental-survey-for-toxicants-test-2013
#8
Han-Bin Huang, Wen-Harn Pan, Jung-Wei Chang, Hung-Che Chiang, Yue Leon Guo, Jouni J K Jaakkola, Po-Chin Huang
BACKGROUND: Previous epidemiologic and toxicological studies provide some inconsistent evidence that exposure to phthalates may affect thyroid function and growth hormone homeostasis. OBJECTIVE: To assess the relations between exposure to phthalates and indicators of thyroid function and growth hormone homeostasis disturbances both among adults and minors. METHODS: We conducted a population-based cross-sectional study of 279 Taiwanese adults (≥18 years old) and 79 minors (<18 years old) in 2013...
November 28, 2016: Environmental Research
https://www.readbyqxmd.com/read/27906594/the-relationship-between-thyroid-function-and-the-prevalence-of-type-2-diabetes-mellitus-in-euthyroid-subjects
#9
Yeqing Gu, Huihui Li, Xue Bao, Qing Zhang, Li Liu, Ge Meng, Hongmei Wu, Huanmin Du, Hongbin Shi, Yang Xia, Qian Su, Liyun Fang, Fei Yu, Huijun Yang, Bin Yu, Shaomei Sun, Xing Wang, Ming Zhou, Qiyu Jia, Qi Guo, Hong Chang, Guolin Wang, Guowei Huang, Kun Song, Kaijun Niu
PURPOSE: The thyroid hormones (TH) are primarily responsible for the regulation of energy balance and metabolism, suggesting that TH levels may contribute to the development of type 2 diabetes mellitus (T2DM). However, few studies have investigated the relationship between TH and T2DM in a general population. The aim of this study is to evaluate whether serum TH levels within the reference range are related to T2DM. METHODS: A cross-sectional study (n=15,296) was performed in Tianjin, China...
December 1, 2016: Journal of Clinical Endocrinology and Metabolism
https://www.readbyqxmd.com/read/27906195/congenital-hypothyroidism-with-delayed-thyroid-stimulating-hormone-elevation-in-premature-infants-born-at-less-than-30-weeks-gestation
#10
D C Kaluarachchi, T T Colaizy, L M Pesce, M Tansey, J M Klein
OBJECTIVE: Congenital hypothyroidism (CH) with delayed thyroid-stimulating hormone (TSH) elevation is a common form of thyroid dysfunction among premature infants. Routine newborn screening (NBS) may miss infants with CH with delayed TSH elevation. The objective of the study is to determine the prevalence of CH with delayed TSH elevation in premature infants and to identify associated risk factors. STUDY DESIGN: Retrospective analysis of serum thyroid function screening (TFS) at day of life 30 in premature infants <30 weeks gestation, admitted to University of Iowa Neonatal Intensive Care Unit between 1 July 2012 to 30 June 2015...
December 1, 2016: Journal of Perinatology: Official Journal of the California Perinatal Association
https://www.readbyqxmd.com/read/27906181/stat6-deficiency-ameliorates-graves-disease-severity-by-suppressing-thyroid-epithelial-cell-hyperplasia
#11
Xuechao Jiang, Bingbing Zha, Xiaoming Liu, Ronghua Liu, Jun Liu, Enyu Huang, Tingting Qian, Jiajing Liu, Zhiming Wang, Dan Zhang, Luman Wang, Yiwei Chu
Signal transducer and activator of transcription 6 (STAT6) is involved in epithelial cell growth. However, little is known regarding the STAT6 phosphorylation status in Graves' disease (GD) and its role in thyroid epithelial cells (TECs). In this study, we found that STAT6 phosphorylation (p-STAT6) was significantly increased in TECs from both GD patients and experimental autoimmune Graves' disease mice and that STAT6 deficiency ameliorated GD symptoms. Autocrine IL-4 signalling in TECs activated the phosphorylation of STAT6 via IL-4 R engagement, and the downstream targets of STAT6 were Bcl-xL and cyclin D1...
December 1, 2016: Cell Death & Disease
https://www.readbyqxmd.com/read/27906155/-prevalence-of-hypothyroidism-in-andalusia-spain-determined-by-thyroid-hormone-comsumption
#12
José Escribano-Serrano, José Mancera-Romero, Vanessa Santos-Sánchez, Carolina Payá-Giner, Mª Isabel Méndez-Esteban, Antonio García-Bonilla, Manuela Márquez-Ferrando, Antonio Hormigo-Pozo, Alfredo Michán-Doña
OBJECTIVE: Hypothyroidism is the most common condition linked to a hormone deficiency, nevertheless data on its prevalence are scarce in Spain. For that reason, we have estimated its prevalence through the registration of patients who had used thyroid hormones in Andalusia (South Spain). METHODS: Data of patients who had withdrawn levothyroxine under the public system during 2014 from the base of the Andalusian Health Service were considered. Prevalence were calculated with confidence intervals of 95% for each management area, stratified by sex and age groups, and differences between them were evaluated...
December 2, 2016: Revista Española de Salud Pública
https://www.readbyqxmd.com/read/27905199/high-prevalence-of-anti-tsh-receptor-antibody-in-fibromyalgia-syndrome
#13
Kenya Nishioka, Toyoyoshi Uchida, Chie Usui, Ryota Tanaka, Takashi Matsushima, Yoshifuji Matsumoto, Ikuro Nakamura, Kusuki Nishioka, Nobutaka Hattori
AIM: Fibromyalgia syndrome (FMS) is defined as chronic widespread pain that cannot be accounted for by any other medical disorder. Our aim was to explore the prevalence of thyroid autoimmunity in patients with FMS. METHODS: For determining thyroid function in 207 FMS patients, we tested for the titers of free tri-iodothyronine, free thyroxine, thyroid-stimulating hormone (TSH), anti-thyroid peroxidase antibody (TPOAb), anti-thyroglobulin antibody (TgAb) and anti-TSH receptor antibody (TRAb)...
November 30, 2016: International Journal of Rheumatic Diseases
https://www.readbyqxmd.com/read/27904425/association-of-thyroid-profile-and-prolactin-level-in-patient-with-secondary-amenorrhea
#14
Sujata Shrestha, Sunita Neupane, Narayan Gautam, Raju Kumar Dubey, Amit Chandra Jha, Nilesh Raj Doshi, Archana Jayan
BACKGROUND: Amenorrhea is the absence of menstrual periods. It has multiple social consequences as it may leads to infertility. This case control study was conducted for determining the association of thyroid hormones with hyperprolactinemia in patient with amenorrhea. METHODS: We investigated 50 women with diagnosed cases of secondary amenorrhoea, who attended UCMS hospital, for hormonal evaluations. Fifty two healthy women were taken as the controls. The thyroid dysfunction and serum prolactin level were reviewed in cases and in the controls...
September 2016: Malaysian Journal of Medical Sciences: MJMS
https://www.readbyqxmd.com/read/27904073/a-case-of-familial-dysalbuminemic-hyperthyroxinemia-fdh-in-japan-fdh-as-a-possible-differential-diagnosis-of-syndrome-of-inappropriate-secretion-of-thyroid-stimulating-hormone-sitsh
#15
Sakiko Kobayashi, Jaeduk Yoshimura Noh, Taeko Shimizu, Tomoaki Sato, Isao Kurihara, Kiminori Sugino, Hiroshi Itoh, Koichi Ito
Familial dysalbuminemic hyperthyroxinemia (FDH) is an autosomal dominant condition and is the most commonly inherited euthyroid hyperthyroxinemia in Caucasians. However, it is extremely rare in Asian populations. A 30-year-old Japanese woman, who was incidentally found to have apparent thyroid dysfunction, was admitted to our hospital in 2004. She had extremely elevated serum free thyroxine (FT4), moderately elevated free triiodothyronine (FT3), and normal thyroid-stimulating hormone (TSH). Clinical thyroid examination revealed no abnormalities other than small goiter...
November 30, 2016: Endocrine Journal
https://www.readbyqxmd.com/read/27903512/thyroid-hormone-stimulated-increases-in-pgc-1%C3%AE-and-ucp2-promote-life-history-specific-endocrine-changes-and-maintain-a-lipid-based-metabolism
#16
Bridget Martinez, José G Soñanez-Organis, Jose A Godoy-Lugo, Lillian Horin, Daniel E Crocker, Rudy M Ortiz
Thyroid hormones (TH) regulate metabolism, but are typically suppressed during times of stressful physiological conditions, including fasting. Interestingly, prolonged fasting in northern elephant seal pups is associated with reliance on a lipid-based metabolism and increased levels of circulating thyroid hormones that are partially attributed to active secretion as opposed to reduced clearance. This apparent paradox is coupled with complementary increases in cellular TH-mediated activity suggesting that in mammals naturally adapted to prolonged fasting TH are necessary to support metabolism...
November 30, 2016: American Journal of Physiology. Regulatory, Integrative and Comparative Physiology
https://www.readbyqxmd.com/read/27902975/timing-of-hormone-withdrawal-in-children-undergoing-131i-whole-body-scans-for-thyroid-cancer
#17
Sophie Turpin, Raymond Lambert, Cheri Deal
BACKGROUND: Little objective pediatric data exist to guide the optimal time needed to achieve thyroid-stimulating hormone (TSH) levels ≥30 μIU/mL prior to performing 131I or 123I whole-body scan (WBS) imaging in children with thyroid cancer in the post-thyroidectomy period or after hormone discontinuation. METHODS: Retrospective study of patients aged 5-19 years who underwent WBS. Patient data collection included type and duration of withdrawal (liothyronine [L-T3], levothyroxine [L-T4], or post-thyroidectomy status without hormonal replacement) and TSH measured prior to WBS (level and timing)...
December 1, 2016: Hormone Research in Pædiatrics
https://www.readbyqxmd.com/read/27902923/kisspeptin-expression-is-decreased-in-the-arcuate-nucleus-of-hypothyroid-female-rats-with-irregular-estrus-cycles
#18
Yuji Tomori, Ken Takumi, Norio Iijima, Shinro Takai, Hitoshi Ozawa
Insufficiency of thyroid hormones inhibits gonadotropin release and results in dysregulation of reproductive function, although the precise mechanism of this disrupted gonadotropin secretion remains unclear. Kisspeptin is a neuropeptide that strongly stimulates gonadotropin secretion and plays an important role in reproductive function. To examine the involvement of kisspeptin in the dysregulation of gonadotropin secretion in hypothyroidism, we investigated Kiss1 mRNA expression and kisspeptin immunoreactivity in the hypothalamus of female rats treated with propylthiouracil (PTU)...
November 27, 2016: Neuroscience Research
https://www.readbyqxmd.com/read/27902601/time-course-of-graves-orbitopathy-after-total-thyroidectomy-and-radioiodine-therapy-for-thyroid-cancer
#19
Camille Louvet, Annamaria De Bellis, Bruno Pereira, Claire Bournaud, Antony Kelly, Salwan Maqdasy, Beatrice Roche, Francoise Desbiez, Francoise Borson-Chazot, Igor Tauveron, Marie Batisse-Lignier
The risk of cancer is relatively higher in Graves' patients presenting simultaneously with thyroid nodules. Radioiodine (RAI) therapy recommended in high-risk differentiated thyroid carcinoma may be associated with worsening of a pre-existing Graves' orbitopathy (GO) or developing a new onset. The impact of RAI therapy in patients with differentiated thyroid cancer on the course of a pre-exisiting GO has not been specifically investigated.The aim of this study is to assess the influence of RAI treatment administered for differentiated thyroid cancer on the course of a pre-existing GO...
November 2016: Medicine (Baltimore)
https://www.readbyqxmd.com/read/27902589/serum-thyroglobulin-reference-intervals-in-regions-with-adequate-and-more-than-adequate-iodine-intake
#20
Zhaojun Wang, Hanyi Zhang, Xiaowen Zhang, Jie Sun, Cheng Han, Chenyan Li, Yongze Li, Xiaochun Teng, Chenling Fan, Aihua Liu, Zhongyan Shan, Chao Liu, Jianping Weng, Weiping Teng
The purpose of this study was to establish normal thyroglobulin (Tg) reference intervals (RIs) in regions with adequate and more than adequate iodine intake according to the National Academy of Clinical Biochemistry (NACB) guidelines and to investigate the relationships between Tg and other factors.A total of 1317 thyroid disease-free adult subjects (578 men, 739 nonpregnant women) from 2 cities (Guangzhou and Nanjing) were enrolled in this retrospective, observational study. Each subject completed a questionnaire and underwent physical and ultrasonic examination...
November 2016: Medicine (Baltimore)
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