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Triiodothyronine

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https://www.readbyqxmd.com/read/29673469/thyroid-hormones-and-cardiovascular-function-and-diseases
#1
REVIEW
Salman Razvi, Avais Jabbar, Alessandro Pingitore, Sara Danzi, Bernadette Biondi, Irwin Klein, Robin Peeters, Azfar Zaman, Giorgio Iervasi
Thyroid hormone (TH) receptors are present in the myocardium and vascular tissue, and minor alterations in TH concentration can affect cardiovascular (CV) physiology. The potential mechanisms that link CV disease with thyroid dysfunction are endothelial dysfunction, changes in blood pressure, myocardial systolic and diastolic dysfunction, and dyslipidemia. In addition, cardiac disease itself may lead to alterations in TH concentrations (notably, low triiodothyronine syndrome) that are associated with higher morbidity and mortality...
April 24, 2018: Journal of the American College of Cardiology
https://www.readbyqxmd.com/read/29665650/selenium-nanoparticles-prevents-lead-acetate-induced-hypothyroidism-and-oxidative-damage-of-thyroid-tissues-in-male-rats-through-modulation-of-selenoenzymes-and-suppression-of-mir-224
#2
Hebatallah Husseini Atteia, Manar Hamed Arafa, Kousalya Prabahar
Selenium nanoparticles (Se-NPs) are customizable drug delivery vehicles that show good bioavailability, higher efficacy and lower toxicity than ordinary Se. Pre-treatment of male rats with these NPs has been recently shown to exert a protective effect against chromium-induced thyroid dysfunction. This study, therefore, aimed to investigate and characterize the potential protective mechanism of Se-NPs against lead (Pb) acetate-induced thyrotoxicity. We found that prophylactic and concurrent treatment of Pb acetate-exposed rats with Nano-Se (0...
March 2018: Biomedicine & Pharmacotherapy, Biomédecine & Pharmacothérapie
https://www.readbyqxmd.com/read/29665466/dose-response-relationships-between-urinary-phthalate-metabolites-and-serum-thyroid-hormones-among-waste-plastic-recycling-workers-in-china
#3
Xian Wang, Li Wang, Jiafei Zhang, Wenjun Yin, Jian Hou, Youjian Zhang, Chen Hu, Guiyang Wang, Rong Zhang, Yong Tao, Jing Yuan
BACKGROUND: Exposure to phthalates may affect thyroid hormone status. However, there were inconsistent observations for the associations of phthalates exposure with altered thyroid hormones. OBJECTIVES: The aim of this study was to investigate effects of urinary excretion of phthalate metabolites on the levels of thyroid hormones among workers engaged in waste plastic recycling in China. METHODS: We measured serum levels of thyroid hormones and urinary levels of eight phthalate metabolites among 317 participants (165 workers engaged in waste plastic recycling and 152 farmers), analyzed relationships between urinary phthalate metabolites and thyroid function parameters by multivariate linear regression analysis and structural equation modelling as well as assessed the dose-response relationships between them by restricted cubic spline functions...
April 14, 2018: Environmental Research
https://www.readbyqxmd.com/read/29660579/the-effect-of-dermal-benzophenone-2-administration-on-immune-system-activity-hypothalamic-pituitary-thyroid-axis-activity-and-hematological-parameters-in-male-wistar-rats
#4
Żaneta Broniowska, Joanna Ślusarczyk, Beata Starek-Świechowicz, Ewa Trojan, Bartosz Pomierny, Weronika Krzyżanowska, Agnieszka Basta-Kaim, Bogusława Budziszewska
Benzophenones used as UV filters, in addition to the effects on the skin, can be absorbed into the blood and affect the function of certain organs. So far, their effects on the sex hormone receptors and gonadal function have been studied, but not much is known about their potential action on other systems. The aim of the present study was to determine the effect of benzophenone-2 (BP-2) on immune system activity, hypothalamic-pituitary-thyroid (HPT) axis activity and hematological parameters. BP-2 was administered dermally, twice daily at a dose of 100 mg/kg for 4-weeks to male Wistar rats...
April 13, 2018: Toxicology
https://www.readbyqxmd.com/read/29658834/alterations-in-thyroid-hormone-levels-following-growth-hormone-replacement-exert-complex-biological-effects
#5
Nigel Glynn, Helena Kenny, Tarik Salim, David J Halsall, Diarmuid Smith, Tommy Kyaw Tun, John H McDermott, William Tormey, Christopher J Thompson, Brendan McAdam, Donal O' Gorman, Amar Agha
OBJECTIVE: Alterations in the thyroid axis are frequently observed following growth hormone (GH) replacement, but uncertainty exists regarding their clinical significance. We aimed to compare fluctuations in circulating thyroid hormone levels, induced by GH, to changes in sensitive biological markers of thyroid hormone action. METHODS: This was a prospective observational clinical study. Twenty hypopituitary men were studied before and after GH replacement. Serum thyroid-stimulating hormone (TSH), thyroid hormones, and insulin-like growth factor 1 were measured...
April 2018: Endocrine Practice
https://www.readbyqxmd.com/read/29656705/suppressive-effects-of-neonatal-bisphenol-a-on-the-neuroendocrine-system
#6
R G Ahmed, G H Walaa, F S Asmaa
The aim of this study was to assess the effects of neonatal bisphenol A (BPA) administration on neuroendocrine features (the thyroid-brain axis). BPA (20 or 40 µg/kg) was orally administered to juvenile male albino rats ( Rattus norvegicus) from postnatal days (PNDs) 15 to 30. Both doses resulted in lower serum thyroxine (T4), triiodothyronine (T3), and growth hormone levels and higher thyrotropin level than the control levels at PND 30. In the neonatal cerebellum and cerebrum, vacuolation, pyknosis, edema, degenerative changes, and reductions in the size and number of the cells were observed in both treated groups...
January 1, 2018: Toxicology and Industrial Health
https://www.readbyqxmd.com/read/29650790/effect-of-endocannabinoid-oleamide-on-rat-and-human-liver-cytochrome-p450-enzymes-in-in-vitro-and-in-vivo-models
#7
Gabriela Dovrtelova, Ondrej Zendulka, Kristyna Noskova, Jan Jurica, Ondrej Pes, Jan Dusek, Alejandro Carazo, Iveta Zapletalova, Natasa Hlavacova, Petr Pavek
The endocannabinoid system is important for many physiological and pathological processes, but its role in the regulation of liver cytochromes P450 (CYPs) is still unknown. We studied the influence of the endocannabinoid oleamide on rat and human liver CYPs. Oleamide was administered i.p. to rats at doses of 0.1, 1 and 10 mg/kg/day for 7 days. The content and activity of key CYPs was evaluated in rat liver microsomes. Moreover, its interactions with nuclear receptors regulating CYP genes and serum levels of their ligands (prolactin, corticosterone, and free triiodothyronine) were tested in vitro CYP inhibition assays...
April 12, 2018: Drug Metabolism and Disposition: the Biological Fate of Chemicals
https://www.readbyqxmd.com/read/29649216/serum-microrna-profiles-in-athyroid-patients-on-and-off-levothyroxine-therapy
#8
Elske T Massolt, Layal Chaker, Theo J Visser, Ad J M Gillis, Lambert C J Dorssers, Carolien M Beukhof, Boen L R Kam, Gaston J Franssen, Giulia Brigante, Tessa M van Ginhoven, W Edward Visser, Leendert H J Looijenga, Robin P Peeters
BACKGROUND: Levothyroxine replacement treatment in hypothyroidism is unable to restore physiological thyroxine and triiodothyronine concentrations in serum and tissues completely. Normal serum thyroid stimulating hormone (TSH) concentrations reflect only pituitary euthyroidism and, therefore, novel biomarkers representing tissue-specific thyroid state are needed. MicroRNAs (miRNAs), small non-coding regulatory RNAs, exhibit tissue-specific expression patterns and can be detectable in serum...
2018: PloS One
https://www.readbyqxmd.com/read/29648895/functional-polymorphisms-of-the-type-1-and-type-2-iodothyronine-deiodinase-genes-in-autoimmune-thyroid-diseases
#9
Naoya Inoue, Mikio Watanabe, Yuka Katsumata, Naoko Ishido, Yoh Hidaka, Yoshinori Iwatani
Graves' disease (GD) and Hashimoto's disease (HD) are major autoimmune thyroid diseases (AITDs), and their pathological conditions vary among patients. Type 1 iodothyronine deiodinase (D1) and type 2 iodothyronine deiodinase (D2) convert from thyroxine (T4) to triiodothyronine (T3). However, few findings have been described concerning the association between polymorphisms in D1 and D2 genes and AITD. Therefore, we genotyped D1 rs11206244, D2 rs225014, and rs12885300 polymorphisms in 134 GD patients, including 54 patients with intractable GD and 44 patients with GD in remission and 132 HD patients, including 57 patients with severe HD, 45 patients with mild HD, and 84 healthy controls using PCR-RFLP...
April 12, 2018: Immunological Investigations
https://www.readbyqxmd.com/read/29648626/regulation-of-intracellular-triiodothyronine-is-essential-for-optimal-macrophage-function
#10
Anne H van der Spek, Olga V Surovtseva, Kin Ki Jim, Adri van Oudenaren, Matthijs C Brouwer, Christina M J E Vandenbroucke-Grauls, Pieter J M Leenen, Diederik van de Beek, Arturo Hernandez, Eric Fliers, Anita Boelen
Innate immune cells, including macrophages, have recently been identified as novel target cells for thyroid hormone. We hypothesized that optimal intracellular concentrations of the active thyroid hormone triiodothyronine (T3) are essential for pro-inflammatory macrophage function. T3 is generated intracellularly by type 2 deiodinase (D2) and acts via the nuclear thyroid hormone receptor (TR). In zebrafish embryos, D2 knockdown increased mortality during pneumococcal meningitis. Primary murine D2KO macrophages exhibited impaired phagocytosis and partially reduced cytokine response to stimulation with bacterial endotoxin...
April 10, 2018: Endocrinology
https://www.readbyqxmd.com/read/29642517/asymptomatic-effect-of-occupational-radiation-exposure-on-thyroid-gland-hormones-and-thyroid-gland-ultrasonographic-abnormalities
#11
Khaled Alawneh, Musa Alshehabat, Haytham Al-Ewaidat, Liqaa Raffee, Duaa Forihat, Yousef Khader
Data evaluating the effect of asymptomatic effects of radiation on thyroid hormone panels and ultrasonographic abnormalities among radiology technologists are scarce. This study aimed to determine the asymptomatic effect of radiation in a total of 39 male and 11 female exposed radiology technologists working in radiology departments, and a total of 34 male and 16 female age-matched controls working in other departments in the same hospital. The level of triiodothyronine (T₃), thyroxine (T₄) and thyroid-stimulating hormone (TSH) were evaluated using Enzyme Linked Immunosorbent Assay (ELISA)...
April 9, 2018: Journal of Clinical Medicine
https://www.readbyqxmd.com/read/29628400/-prevalence-and-prognostic-value-of-non-thyroidal-illness-syndrome-among-critically-ill-children
#12
Sohair Sayed Abu El-Ella, Muhammad Said El-Mekkawy, Mohamed Abdelrahman El-Dihemey
INTRODUCTION: Alterations in thyroid hormones during critical illness, known as non-thyroidal illness syndrome (NTIS), were suggested to have a prognostic value. However, pediatric data is limited. The aim of this study was to assess prevalence and prognostic value of NTIS among critically ill children. MATERIALS AND METHODS: A prospective observational study conducted on 70 critically ill children admitted into pediatric intensive care unit (PICU). Free triiodothyronine (FT3), free thyroxine (FT4), and thyroid stimulating hormone (TSH) were measured within 24hours of PICU admission...
April 5, 2018: Anales de Pediatría: Publicación Oficial de la Asociación Española de Pediatría (A.E.P.)
https://www.readbyqxmd.com/read/29627642/a-prognostic-role-for-low-tri-iodothyronine-syndrome-in-acute-stroke-patients-a-systematic-review-and-meta-analysis
#13
REVIEW
Nayan Lamba, Chunming Liu, Hasan Zaidi, M L D Broekman, Thomas Simjian, Chen Shi, Joanne Doucette, Steven Ren, Timothy R Smith, Rania A Mekary, Adomas Bunevicius
BACKGROUND: Low triiodothyronine (T3) syndrome could be a powerful prognostic factor for acute stroke; yet, a prognostic role for low T3 has not been given enough importance in stroke management. This meta-analysis aimed to evaluate whether low T3 among acute stroke patients could be used as a prognostic biomarker for stroke severity, functional outcome, and mortality. METHODS: Studies that investigated low T3 prognostic roles in acute stroke patients were sought from PubMed/Medline, Embase, and Cochrane databases through 11/23/2016...
March 31, 2018: Clinical Neurology and Neurosurgery
https://www.readbyqxmd.com/read/29624097/positive-thyrotropin-receptor-antibodies-in-patients-with-transient-thyrotoxicosis
#14
Trevor E Angell, Olivia Van Benschoten, David A Cohen, Andrea V Haas, Erik K Alexander, Ellen Marqusee
OBJECTIVE: Thyrotropin (TSH) receptor antibody (TRAb) testing is considered accurate for the diagnosis of Graves' disease (GD), and had been identified rarely in thyrotoxic patients without GD. We describe four patients with transient thyrotoxicosis and positive TRAb to highlight this clinical possibility. METHODS: Patient demographics, symptoms, laboratory findings, and time to resolution of thyrotoxicosis are summarized. TRAb testing was performed by either a third-generation thyrotropin binding inhibitory immunoglobulin competitive binding assay (TBII) or a thyroid stimulating antibody bioassay (TSI) from either Mayo Clinic Laboratory or Quest Diagnostics...
April 6, 2018: Endocrine Practice
https://www.readbyqxmd.com/read/29624094/percutaneous-ethanol-injection-for-benign-cystic-and-mixed-thyroid-nodules
#15
A Ozderya, K Aydin, N Gokkaya, S Temizkan
BACKGROUND/AIM: We aimed to determine the effect of percutaneous ethanol injection (PEI) on volume of cystic and mixed thyroid nodules, thyroid function tests (TFTs), antibody titers and cytological changes for 1 year. METHODS: Fifty-five nodules of 53 patients with cystic and mixed properties treated with PEI were included. Nodule volumes, TFTs, thyroid autoantibodies were analyzed at baseline, 6th and 12th months. Fine needle aspiration biopsy (FNAB) was performed to PEI applied nodules in the 12th month...
April 6, 2018: Endocrine Practice
https://www.readbyqxmd.com/read/29623823/low-25-hydroxyvitamin-d-levels-are-independently-associated-with-autoimmune-thyroiditis-in-a-cohort-of-apparently-healthy-overweight-and-obese-subjects
#16
Giovanni De Pergola, Vincenzo Triggiani, Nicola Bartolomeo, Vito Angelo Giagulli, Michele Anelli, Michele Masiello, Vittoria Candita, Dario De Bellis, Franco Silvestris
BACKGROUND: Low vitamin D levels have been associated with autoimmune disorders and, then, with the Hashimoto's autoimmune thyroiditis (AT), the most common autoimmune disease. Obesity is characterized by lower vitamin D levels and higher risk to develop autoimmune diseases. The aim of the study was to examine the possibility of an association between AT and decreased 25(OH) vitamin D (25(OH)D) levels in a cohort of otherwise healthy overweight and obese subjects. MATERIALS AND METHODS: Two hundred sixty one overweight subjects (mean age: 40...
April 6, 2018: Endocrine, Metabolic & Immune Disorders Drug Targets
https://www.readbyqxmd.com/read/29620972/an-online-survey-of-hypothyroid-patients-demonstrates-prominent-dissatisfaction
#17
Sarah J Peterson, Anne R Cappola, M Regina Castro, Colin M Dayan, Alan P Farwell, James V Hennessey, Peter A Kopp, Douglas S Ross, Mary H Samuels, Anna M Sawka, Peter N Taylor, Jacqueline Jonklaas, Antonio C Bianco
BACKGROUND: Approximately 15% more patients taking levothyroxine (LT4) report impaired quality of life compared to controls. This could be explained by additional diagnoses independently affecting quality of life and complicating assignment of causation. This study sought to investigate the underpinnings of reduced quality of life in hypothyroid patients and to provide data for discussion at a symposium addressing hypothyroidism. METHODS: An online survey for hypothyroid patients was posted on the American Thyroid Association Web site and forwarded to multiple groups...
April 5, 2018: Thyroid: Official Journal of the American Thyroid Association
https://www.readbyqxmd.com/read/29619006/mathematical-modeling-of-the-pituitary-thyroid-feedback-loop-role-of-a-tsh-t-3-shunt-and-sensitivity-analysis
#18
Julian Berberich, Johannes W Dietrich, Rudolf Hoermann, Matthias A Müller
Despite significant progress in assay technology, diagnosis of functional thyroid disorders may still be a challenge, as illustrated by the vague upper limit of the reference range for serum thyrotropin ( TSH ). Diagnostical problems also apply to subjects affected by syndrome T, i.e., those 10% of hypothyroid patients who continue to suffer from poor quality of life despite normal TSH concentrations under substitution therapy with levothyroxine ( L - T 4 ). In this paper, we extend a mathematical model of the pituitary-thyroid feedback loop in order to improve the understanding of thyroid hormone homeostasis...
2018: Frontiers in Endocrinology
https://www.readbyqxmd.com/read/29617759/regulation-of-gene-expression-by-thyroid-hormone-in-primary-astrocytes-factors-influencing-the-genomic-response
#19
Beatriz Morte, Pilar Gil-Ibáñez, Juan Bernal
Astrocytes mediate the action of thyroid hormone in the brain on other neural cells through the production of the active hormone triiodothyronine (T3) from its precursor thyroxine (T4). T3 has also many effects on the astrocytes in vivo and in culture, but whether these actions are directly mediated by transcriptional regulation is not clear. In this work we have analyzed the genomic response to T3 of cultured astrocytes isolated from the postnatal mouse cerebral cortex, using RNA sequencing. Cultured astrocytes express relevant genes of thyroid hormone metabolism and action encoding type 2 deiodinase (Dio2), Mct8 transporter (Slc16a2), T3 receptors (Thra1 and Thrb), and nuclear corepressor (Ncor1) and coactivator (Ncoa1)...
April 2, 2018: Endocrinology
https://www.readbyqxmd.com/read/29617370/metabolic-and-hormonal-adaptation-in-bubalus-bubalis-around-calving-and-early-lactation
#20
Enrico Fiore, Francesca Arfuso, Matteo Gianesella, Domenico Vecchio, Massimo Morgante, Elisa Mazzotta, Tamara Badon, Pasquale Rossi, Silvia Bedin, Giuseppe Piccione
Pregnancy and lactation are physiological periods that result in an increased metabolic demand that, if not satisfied, could provoke a threat to homeostasis. In this study changes in the values of Non-Esterified Fatty Acids (NEFA) and β-hydroxybutyrate (BHB), glucose, insulin, thyroid hormones, milk composition and yield were investigated in buffaloes during the late pregnancy and early lactation. From a total of 50 buffaloes, blood samples were collected -7±5 days before expected calving; +7±5; +30±5 and +50±5 days post-partum; milk samples were collected at the same post-partum time points...
2018: PloS One
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