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https://www.readbyqxmd.com/read/29225205/effect-of-di-2-ethylhexyl-phthalate-on-the-hypothalamus-pituitary-thyroid-axis-in-adolescent-rat
#1
Di Sun, Liting Zhou, Shuyue Wang, Te Liu, Jian Zhu, Yiyang Jia, Jin Xu, Huaiji Chen, Qi Wang, Feng Xu, Yuezhu Zhang, Lin Ye
Di-(2-ethylhexyl) phthalate (DEHP) is extensively used in many personal care and consumer products, which has resulted in widespread human exposure. Limited studies have suggested that exposure to DEHP may affect thyroid function, but little is known about the effect and mechanisms of DEHP exposure on the hypothalamic-pituitary-thyroid axis (HPTA). The present study was conducted to elucidate the potential mechanisms in which DEHP disrupts the function of the HPTA. Wistar rats were administered DEHP by gavage at 0, 5, 50, and 500 mg/kg/day for 28 days and then sacrificed within 24 h following the last dose...
December 9, 2017: Endocrine Journal
https://www.readbyqxmd.com/read/29214084/coexistence-of-primary-hyperaldosteronism-and-graves-disease-a-rare-combination-of-endocrine-disorders-is-it-beyond-a-coincidence-a-case-report-and-review-of-the-literature
#2
S S C Gunatilake, U Bulugahapitiya
Background: Primary hyperaldosteronism is a known cause for secondary hypertension. In addition to its effect on blood pressure, aldosterone exhibits proinflammatory actions and plays a role in immunomodulation/development of autoimmunity. Recent researches also suggest significant thyroid dysfunction among patients with hyperaldosteronism, but exact causal relationship is not established. Autoimmune hyperthyroidism (Graves' disease) and primary hyperaldosteronism rarely coexist but underlying mechanisms associating the two are still unclear...
2017: Case Reports in Endocrinology
https://www.readbyqxmd.com/read/29209896/braf-oncogene-induced-senescence-and-the-role-of-thyroid-stimulating-hormone-signaling-in-the-progression-of-papillary-thyroid-carcinoma
#3
REVIEW
F I Moulana, A A H Priyani, M V C de Silva, R S Dassanayake
Oncogene-induced senescence (OIS) explains the phenomenon of cellular senescence triggered by the action of oncogenes. It is a mechanism adopted by a cell to inhibit progression of benign tumors into malignancy, occurs in premalignant lesions, and is almost never present in malignant lesions. BRAF mutations occur in about 40-45% of all papillary thyroid carcinomas (PTCs) and of which 99.7% is the BRAFV600E mutation. A unique phenotype of the BRAFV600E mutation is the upregulation of the thyroid-stimulating hormone receptor (TSHR) on thyrocyte membranes...
December 5, 2017: Hormones & Cancer
https://www.readbyqxmd.com/read/29184815/transient-hypothyroidism-in-the-newborn-to-treat-or-not-to-treat
#4
REVIEW
Neelakanta Kanike, Ajuah Davis, Prem S Shekhawat
Transient congenital hypothyroidism (CH) refers to a temporary deficiency of thyroid hormone identified after birth, with low thyroxine (T4) and elevated thyrotropin (TSH), which later recovers to improved thyroxine production, typically in first few months of infancy. Approximately 17% to 40% of children diagnosed with CH by newborn screening (NBS) programs were later determined to have transient hypothyroidism. Causes of transient CH are prematurity, iodine deficiency, maternal thyrotropin receptor blocking antibodies, maternal intake of anti-thyroid drugs, maternal or neonatal iodine exposure, loss of function mutations and hepatic hemangiomas...
October 2017: Translational pediatrics
https://www.readbyqxmd.com/read/29181135/graves-disease-thyrotoxicosis-and-propylthiouracil-related-agranulocytosis-successfully-treated-with-therapeutic-plasma-exchange-and-g-csf-followed-by-total-thyroidectomy
#5
Anna Candoni, Federico De Marchi, Fabio Vescini, Sara Mauro, Cristina Rinaldi, Marco Piemonte, Nicholas Rabassi, Maria Vittoria Dubbini, Renato Fanin
Antithyroid drugs can be a rare cause of agranulocytosis (0.5% of treated patients). Suspension of these drugs is mandatory in these patients and may result in worsening hyperthyroidism. We report the case of a 27-year-old woman who is 3 months post-partum, breastfeeding, and suffering with Graves' disease hyperthyroidism treated first with methimazole and then with propylthiouracil due to a methimazole allergy. She was admitted for urosepsis and agranulocytosis. The patient was diagnosed with propylthiouracil related agranulocytosis, diffuse toxic goiter and thyro-gastric syndrome...
2017: Mediterranean Journal of Hematology and Infectious Diseases
https://www.readbyqxmd.com/read/29163760/tsh-independent-release-of-thyroid-hormones-through-cold-exposure-in-aging-rats
#6
Gi Cheol Park, Ji Min Kim, Hee-Young Park, Ji Min Han, Sung-Chan Shin, Jeon Yeob Jang, Dawoon Jung, In Joo Kim, Jin-Choon Lee, Byung-Joo Lee
Thyroid function decreases and cold exposure response becomes impaired with increasing age. We investigated the age-related changes in thyroid structure and function and cold-induced changes in the thyroid activity of aging rats. Thirty-two male Sprague-Dawley rats were randomly divided into four groups (8 rats per group): young (7 months) and old (22 months) groups exposed to room temperature and cold stress. The active follicle ratio and serum free T3, T4 and TSH, and TSH receptor (TSHR) concentrations in the thyroid tissues of the rats from each group were compared...
October 27, 2017: Oncotarget
https://www.readbyqxmd.com/read/29161598/roles-and-potential-mechanisms-of-selenium-in-countering-thyrotoxicity-of-dehp
#7
Pei Zhang, Xie Guan, Min Yang, Li Zeng, Changjiang Liu
Di-(2-ethylhexyl) phthalate (DEHP) as a ubiquitous environmental contaminant could disturb thyroid hormone (TH) homeostasis. Selenium as an essential trace element has protective effects on thyroids. To verify roles of selenium in countering thyrotoxicity of DEHP and elucidate potential mechanisms, Sprague-Dawley rats and Nthy-ori 3-1 cells were treated with DEHP or/and selenomethionine (SeMet). Results showed that selenium supplementation elevated plasma free thyroxine (FT4) that was decreased by DEHP, and free triiodothyronine (FT3) and thyroid stimulating hormone (TSH) levels were also partially recovered...
November 18, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/29157942/expression-of-two-glycoprotein-hormone-receptors-in-larval-parasitic-phase-and-adult-sea-lampreys
#8
Krist N Hausken, Timothy J Marquis, Stacia A Sower
All jawed vertebrates have three canonical glycoprotein hormones (GpHs: luteinizing hormone, LH; follicle stimulating hormone, FSH; and thyroid stimulating hormone, TSH) with three corresponding GpH receptors (GpH-Rs: LH-R, FSH-R and TSH-R). In contrast, we propose that the jawless vertebrate, sea lamprey (Petromyzon marinus), only has two pituitary glycoprotein hormones, lamprey (l)GpH and l-thyrostimulin, and two functional glycoprotein receptors, lGpH-R I and II. It is not known at this time whether there is a specific receptor for lGpH and l-thyrostimulin, or if both GpHs can differentially activate the lGpH-Rs...
November 17, 2017: General and Comparative Endocrinology
https://www.readbyqxmd.com/read/29144817/seasonal-variation-of-vitamin-d-and-serum-thyrotropin-levels-and-its-relationship-in-a-euthyroid-caucasian-population
#9
Gautam Das, Peter N Taylor, Heather Javaid, Brian P Tennant, John Geen, Andrew Aldridge, Onyebuchi Okosieme
OBJECTIVES: It is unclear whether seasonal variations in vitamin D concentrations affect the hypothalamo-pituitary-thyroid (HPT) axis. We investigated the seasonal variability of vitamin D and serum thyrotropin (TSH) levels and their inter-relationship. METHODS: Analysis of 401 patients referred with non-specific symptoms of tiredness who had simultaneous measurements of 25(OH)D3 and thyroid function. Patients were categorised according to the season of blood sampling and their vitamin D status...
November 16, 2017: Endocrine Practice
https://www.readbyqxmd.com/read/29144795/relationship-between-the-effectiveness-of-inorganic-iodine-and-the-severity-of-graves-thyrotoxicosis-a-retrospective-study
#10
Akira Honda, Toyoyoshi Uchida, Koji Komiya, Hiromasa Goto, Kageumi Takeno, Junko Sato, Ruriko Suzuki, Miwa Himuro, Hirotaka Watada
OBJECTIVE: Inorganic iodine is often used to treat patients with Graves' thyrotoxicosis who do not tolerate thionamides due to adverse effects. However, predictors of continued inorganic iodine efficacy have not been fully elucidated yet. This study aimed to investigate the factors affecting the continued efficacy of potassium iodide (KI) in patients with Graves' thyrotoxicosis. METHODS: In this study, among 1197 patients with Graves' disease who were initially treated with thionamides, we retrospectively studied 24 consecutive Japanese patients whose treatment were changed to KI alone due to the adverse effects of thionamides...
November 16, 2017: Endocrine Practice
https://www.readbyqxmd.com/read/29143548/evaluation-on-the-thyroid-disrupting-mechanism-of-malathion-in-fischer-rat-thyroid-follicular-cell-line-frtl-5
#11
Jingyuan Xiong, Liantian Tian, Yongjie Qiu, Ding Sun, Hao Zhang, Mei Wu, Jintao Wang
Thyroid hormones are involved in many important physiological activities including regulation of energy metabolism, development of nervous system, maintenance of cerebral functions, and so on. Endocrine-disrupting chemicals (EDCs) that interfere with thyroid functions raise serious concerns due to their frequent misuse in areas where regulations are poorly implemented. In addition, chemicals that are originally regarded safe may now be considered as toxic with the development of life sciences. Malathion is an organophosphate insecticide that is widely applied and distributed in agricultural and residential settings...
November 16, 2017: Drug and Chemical Toxicology
https://www.readbyqxmd.com/read/29142837/preoperative-management-in-patients-with-graves-disease
#12
REVIEW
Eliana Piantanida
Graves' disease is the most frequent cause of hyperthyroidism in iodine-sufficient geographical areas and is characterized by the presence in patients' serum of autoantibodies directed against the thyrotropin receptor (TRAb) that cause overproduction and release of thyroid hormones. Clinical presentation results from both hyperthyroidism and underlying autoimmunity. The diagnosis is based on characteristic clinical features and biochemical abnormalities. If serum thyrotropin (TSH) is low, serum free thyroxine (FT4) and free triiodothyronine (FT3) concentrations should be measured to distinguish between subclinical (with normal circulating thyroid hormones) and overt hyperthyroidism (with increased circulating thyroid hormones)...
October 2017: Gland Surgery
https://www.readbyqxmd.com/read/29111305/landmark-discoveries-in-elucidating-the-origins-of-the-hypothalamic-pituitary-system-from-the-perspective-of-a-basal-vertebrate-sea-lamprey
#13
REVIEW
Stacia A Sower
The hypothalamic-pituitary (HP) system, which is specific to vertebrates, is considered to be an evolutionary innovation that emerged prior to or during the differentiation of the ancestral jawless vertebrates (agnathans) leading to the neuroendocrine control of many complex functions. Along with hagfish, lampreys represent the oldest lineage of vertebrates, agnathans (jawless fish). This review will highlight our discoveries of the major components of the lamprey HP axis. Generally, gnathostomes (jawed vertebrates) have one or two hypothalamic gonadotropin-releasing hormones (GnRH) while lampreys have three hypothalamic GnRHs...
October 27, 2017: General and Comparative Endocrinology
https://www.readbyqxmd.com/read/29103088/left-ventricular-functions-in-children-with-newly-diagnosed-graves-disease-a-single-center-study-from-upper-egypt
#14
Kotb Abbass Metwalley, Hekma Saad Farghaly, Abdelrahman Abdelhamid
This study aimed to evaluate the left ventricular (LV) functions in a cohort of children with Graves' disease (GD). This is a cross-sectional case-control study. It included 36 children with GD and 36 healthy children matched for age and gender. Thyroid hormones (TSH, FT4, and FT3) and anti-thyroid autoantibodies [anti-thyroid peroxidase (anti-TPO), thyrotropin receptor (TRAbs), and thyroglobulin antibodies] were measured. Conventional and tissue Doppler imaging (TDI) echocardiographies were used to assess left ventricular systolic and diastolic functions...
November 4, 2017: European Journal of Pediatrics
https://www.readbyqxmd.com/read/29099999/high-fat-simple-carbohydrate-diet-intake-induces-hypothalamic-pituitary-thyroid-axis-dysregulation-in-c57bl-6j-male-mice
#15
Swarnalatha Banavara Nagaraj, Neena Roy, Mahesh Manjunath Gouda, Rajeish Moger, Asha Abraham
Given the association between subclinical hypothyroidism and metabolic syndrome (MetS), we wanted to explore if high fat simple carbohydrate (HFSC) diet affect hypothalamus-pituitary-thyroid axis. One month old male C57BL/6J mice were fed with Control (C) and HFSC (T) feed (n=18 each) respectively for 5 months. T3 showed a significant increase in T(13.5%) compared to age matched C by 5th month.TSH was significantly high (1mo:1.9fold; 3mo:2.66 fold; 5mo:3.5fold) from 1stmonth to 5thmonth in T compared to age matched C...
November 3, 2017: Applied Physiology, Nutrition, and Metabolism, Physiologie Appliquée, Nutrition et Métabolisme
https://www.readbyqxmd.com/read/29098964/misdiagnosis-of-graves-hyperthyroidism-due-to-therapeutic-biotin-intervention
#16
Yentl De Roeck, Eva Philipse, Theodorus B Twickler, Luc Van Gaal
BACKGROUND: Lately, high dose of biotin is often given orally to patients with a primary progressive multiple sclerosis (PPMS). However, the molecule biotin is also a principle compound in various analytic immunoassays. CLINICAL CASE: An asymptomatic 60-year-old woman with PPMS on high dose of biotin therapy (3 × 100 mg/d) displayed abnormal thyroid function tests (TSH 0.02 mU/l, fT4 > 103 pmol/l, and fT3 > 46 pmol/l). TSH was determined by a homogeneous sandwich chemiluminescent immunoassay and fT4 and fT3 were both determined by a homogeneous, sequential, chemiluminescent immunoassay...
November 3, 2017: Acta Clinica Belgica
https://www.readbyqxmd.com/read/29095946/endoplasmic-reticulum-stress-inhibits-expression-of-genes-involved-in-thyroid-hormone-synthesis-and-their-key-transcriptional-regulators-in-frtl-5-thyrocytes
#17
Gaiping Wen, Robert Ringseis, Klaus Eder
Endoplasmic reticulum (ER) stress is characterized by the accumulation of misfolded proteins due to an impairment of ER quality control pathways leading to the activation of a defense system, called unfolded protein response (UPR). While thyrocytes are supposed to be highly susceptible to environmental conditions that cause ER stress due to the synthesis of large amounts of secretory proteins required for thyroid hormone synthesis, systematic investigations on the effect of ER stress on expression of key genes of thyroid hormone synthesis and their transcriptional regulators are lacking...
2017: PloS One
https://www.readbyqxmd.com/read/29089368/discovery-of-a-positive-allosteric-modulator-of-the-tsh-receptor-potentiation-of-tsh-mediated-preosteoblast-differentiation-in-vitro
#18
Susanne Neumann, Elena Eliseeva, Alisa Boutin, Elena Barnaeva, Marc Ferrer, Noel Southall, David Kim, Xin Hu, Sarah J Morgan, Juan J Marugan, Marvin C Gershengorn
Recently, we showed that TSH-enhanced differentiation of a human preosteoblast-like cell model involved a β-arrestin 1 (β-Arr 1) mediated pathway. To study this pathway in more detail, we sought to discover a small molecule ligand that was functionally selective toward human TSH receptor (TSHR) activation of β-Arr 1. High-throughput screening using a cell line stably expressing mutated TSHRs and mutated β-Arr 1 (DiscoverX1 cells) led to the discovery of agonists that stimulated translocation of β-Arr 1 to the TSHR, but did not activate Gs-mediated signaling pathways, i...
October 31, 2017: Journal of Pharmacology and Experimental Therapeutics
https://www.readbyqxmd.com/read/29083325/glis3-is-indispensable-for-tsh-tshr-dependent-thyroid-hormone-biosynthesis-and-follicular-cell-proliferation
#19
Hong Soon Kang, Dhirendra Kumar, Grace Liao, Kristin Lichti-Kaiser, Kevin Gerrish, Xiao-Hui Liao, Samuel Refetoff, Raja Jothi, Anton M Jetten
Deficiency in Krüppel-like zinc finger transcription factor GLI-similar 3 (GLIS3) in humans is associated with the development of congenital hypothyroidism. However, the functions of GLIS3 in the thyroid gland and the mechanism by which GLIS3 dysfunction causes hypothyroidism are unknown. In the current study, we demonstrate that GLIS3 acts downstream of thyroid-stimulating hormone (TSH) and TSH receptor (TSHR) and is indispensable for TSH/TSHR-mediated proliferation of thyroid follicular cells and biosynthesis of thyroid hormone...
October 30, 2017: Journal of Clinical Investigation
https://www.readbyqxmd.com/read/29074327/thyrotropic-activity-of-corticotropin-releasing-hormone-in-an-altricial-bird-species-the-zebra-finch-taeniopygia-guttata
#20
Yugo Watanabe, Sylvia V H Grommen, Bert De Groef
In chicken, corticotropin-releasing hormone (CRH) acts as a thyrotropin (TSH)-releasing factor, mediated by the type 2 CRH receptor (CRHR2) on the thyrotropes of the pituitary gland. It is not known whether CRH also controls TSH release in non-precocial avian species that have a different pattern of thyroidal activity during their life cycle. Therefore, we investigated the TSH-releasing capacity of CRH in an altricial species, the zebra finch (Taeniopygia guttata). Cellular localisation of type 1 CRH receptor (CRHR1) and CRHR2 mRNA in the pituitary was determined by in situ hybridisation, combined with immunohistochemical staining of pituitary thyrotropes...
October 23, 2017: General and Comparative Endocrinology
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