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Methimazole

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https://www.readbyqxmd.com/read/29340156/hepatotoxicity-in-hyperthyroid-patient-after-consecutive-methimazole-and-propylthiouracil-therapies
#1
Fernando Gomez-Peralta, Pablo Velasco-Martínez, Cristina Abreu, María Cepeda, Marta Fernández-Puente
Methimazole (MMI) and propylthiouracil (PTU) are widely used antithyroid drugs (ATD) that have been approved for the treatment of hyperthyroidism. Hepatotoxicity may be induced by these drugs, though they exert dissimilar incidence rates of hepatotoxicity and, possibly, with different underlying pathogenic mechanisms. We report the case of a 55-year-old woman with no relevant medical history diagnosed with hyperthyroidism due to Graves' disease, who developed two episodes of acute hepatitis concurrent with the consecutive administration of two different ATDs, first MMI and then PTU...
2018: Endocrinology, Diabetes & Metabolism Case Reports
https://www.readbyqxmd.com/read/29310665/a-patient-specific-treatment-model-for-graves-hyperthyroidism
#2
Balamurugan Pandiyan, Stephen J Merrill, Flavia Di Bari, Alessandro Antonelli, Salvatore Benvenga
BACKGROUND: Graves' is disease an autoimmune disorder of the thyroid gland caused by circulating anti-thyroid receptor antibodies (TRAb) in the serum. TRAb mimics the action of thyroid stimulating hormone (TSH) and stimulates the thyroid hormone receptor (TSHR), which results in hyperthyroidism (overactive thyroid gland) and goiter. Methimazole (MMI) is used for hyperthyroidism treatment for patients with Graves' disease. METHODS: We have developed a model using a system of ordinary differential equations for hyperthyroidism treatment with MMI...
January 9, 2018: Theoretical Biology & Medical Modelling
https://www.readbyqxmd.com/read/29306930/management-of-thyrotoxicosis-in-children-and-adolescents-35-years-experience-in-304-patients
#3
Fereidoun Azizi, Atieh Amouzegar
BACKGROUND: Diffuse toxic goiter accounts for about 15% of all childhood thyroid diseases. There is great controversy over the management of Graves' disease in children and adolescents. This article reports our experience in 304 children and juvenile patients with Graves' disease. METHODS: Between 1981 and 2015, 304 patients aged 5-19 years with diffuse toxic goiter were studied, of whom 296 patients were treated with antithyroid drugs (ATD) for 18 months. Patients with persistent or relapsed hyperthyroidism who refused ablative therapy with surgery or radioiodine were managed with continuous methimazole (MMI) treatment...
January 8, 2018: Journal of Pediatric Endocrinology & Metabolism: JPEM
https://www.readbyqxmd.com/read/29304184/cardiac-ischemia-reperfusion-injury-is-inversely-affected-by-thyroid-hormones-excess-or-deficiency-in-male-wistar-rats
#4
Fernando A C Seara, Leonardo Maciel, Raiana A Q Barbosa, Nayana C Rodrigues, Anderson L B Silveira, Michelle P Marassi, Adriana B Carvalho, José Hamilton M Nascimento, Emerson L Olivares
AIM: Thyroid dysfunctions can increase the risk of myocardial ischemia and infarction. However, the repercussions on cardiac ischemia/reperfusion (IR) injury remain unclear so far. We report here the effects of hypothyroidism and thyrotoxicosis in the susceptibility to IR injury in isolated rat hearts compared to euthyroid condition and the potential role of antioxidant enzymes. METHODS: Hypothyroidism and thyrotoxicosis were induced by administration of methimazole (MMZ, 300 mg/L) and thyroxine (T4, 12 mg/L), respectively in drinking water for 35 days...
2018: PloS One
https://www.readbyqxmd.com/read/29303614/red-palm-oil-supplementation-does-not-increase-blood-glucose-or-serum-lipids-levels-in-wistar-rats-with-different-thyroid-status
#5
H Rauchová, M Vokurková, S Pavelka, I Vaněčková, N Tribulová, T Soukup
Red palm oil (RPO) is a rich natural source of antioxidant vitamins, namely carotenes, tocopherols and tocotrienols. However, it contains approximately 50 % saturated fatty acids the regular consumption of which could negatively modify lipid profile. The aim of our study was to test whether 7 weeks of RPO supplementation (1 g/kg body weight/day) would affect blood glucose and lipid metabolism in adult male Wistar rats with altered thyroid status. We induced hypothyroidism and hyperthyroidism in rats by oral administration of either methimazole or mixture of thyroid hormones...
January 5, 2018: Physiological Research
https://www.readbyqxmd.com/read/29245333/a-rare-case-of-methimazole-induced-cholestatic-jaundice-in-an-elderly-man-of-asian-ethnicity-with-hyperthyroidism-a-case-report
#6
Hongjian Ji, Feng Yue, Jianxiang Song, Xiaohua Zhou
BACKGROUND: Methimazole is an antithyroid drug that is widely used for the treatment of hyperthyroidism. As an inhibitor of the enzyme thyroperoxidase, methimazole is generally well-tolerated. However, there have been increasing reports of methimazole-induced liver damage, although this effect of methimazole has been limited by the absence of objective diagnosis of the liver condition or the inappropriate use of the Naranjo scale. We present the case of an elderly man with hyperthyroidism, gastritis, and epilepsy who developed liver damage after administration of multiple drugs...
December 2017: Medicine (Baltimore)
https://www.readbyqxmd.com/read/29221723/effects-of-thyroxine-on-expression-of-proteins-related-to-thyroid-hormone-functions-tr-%C3%AE-tr-%C3%AE-rxr-and-erk1-2-in-uterus-during-peri-implantation-period
#7
Abu Sadat Md Sayem, Nelli Giribabu, Sekaran Muniandy, Naguib Salleh
INTRODUCTION: Thyroid hormone is known to play important role during embryo implantation, however mechanisms underlying its actions in uterus during peri-implantation period has not been fully identified. In this study, we hypothesized that thyroid hormone could affect expression of proteins related to its function, where these could explain mechanisms for its action in uterus during this period. METHODS: Female rats, once rendered hypothyroid via oral administration of methimazole (0...
December 5, 2017: Biomedicine & Pharmacotherapy, Biomédecine & Pharmacothérapie
https://www.readbyqxmd.com/read/29201468/a-case-report-of-recurrent-takotsubo-cardiomyopathy-in-a-patient-during-myasthenia-crisis
#8
Anusha Battineni, Naresh Mullaguri, Shail Thanki, Anand Chockalingam, Raghav Govindarajan
Introduction: Patients with myasthenia crisis can develop Takotsubo stress cardiomyopathy (SC) due to emotional or physical stress and high level of circulating catecholamines. We report a patient who developed recurrent Takotsubo cardiomyopathy during myasthenia crisis. Coexisting autoimmune disorders known to precipitate stress cardiomyopathy like Grave's disease need to be evaluated. Case Report: A 69-year-old female with seropositive myasthenia gravis (MG), Grave's disease, and coronary artery disease on monthly infusion of intravenous immunoglobulin (IVIG), prednisone, pyridostigmine, and methimazole presented with shortness of breath and chest pain...
2017: Case Reports in Critical Care
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
#9
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/29174305/perinatal-hypothyroidism-increases-play-behaviors-in-juvenile-rats
#10
Spencer G Smith, Katharine V Northcutt
Thyroid hormones play an instrumental role in the development of the central nervous system. During early development, the fetus is dependent on maternal thyroid hormone production due to the dysfunction of its own thyroid gland. Thus, maternal thyroid dysfunction has been shown to elicit significant abnormalities in neural development, neurochemistry, and behavior in offspring. Previous reports have suggested that human maternal hypothyroidism may increase the chances of having children with autism spectrum disorder and attention-deficit/hyperactivity disorder...
November 21, 2017: Hormones and Behavior
https://www.readbyqxmd.com/read/29163843/effect-of-subclinical-hypothyroidism-on-the-skeletal-system-and-improvement-with-short-term-thyroxine-therapy
#11
Cuixia Gao, Yu Wang, Tingting Li, Jing Huang, Limin Tian
The purpose of the study was to observe changes in the skeletal system of rats with subclinical hypothyroidism (SCH) and to determine whether L-thyroxine (L-T4) administration suppresses those changes. Sixty male Wistar rats were randomly divided into control, SCH, and SCH+T4 groups. SCH was induced in rats by administration of methimazole (MMI), and rats in the SCH+T4 group were treated with L-T4 after 45 days of MMI administration. The SCH group had higher thyroid-stimulating hormone (TSH) level than the control and SCH+T4 groups...
October 27, 2017: Oncotarget
https://www.readbyqxmd.com/read/29116146/inactivation-mechanism-of-n61s-mutant-of-human-fmo3-towards-trimethylamine
#12
Chongliang Gao, Gianluca Catucci, Silvia Castrignanò, Gianfranco Gilardi, Sheila J Sadeghi
Human flavin-containing monooxygenase 3 (hFMO3) catalyses the oxygenation of a wide variety of compounds including drugs as well as dietary compounds. It is the major hepatic enzyme involved in the production of the N-oxide of trimethylamine (TMAO) and clinical studies have uncovered a striking correlation between plasma TMAO concentration and cardiovascular disease. Certain mutations within the hFMO3 gene cause defective trimethylamine (TMA) N-oxygenation leading to trimethylaminuria (TMAU) also known as fish-odour syndrome...
November 7, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29112772/regulation-of-thyroid-sodium-iodide-symporter-in-different-stages-of-goiter-possible-involvement-of-ros
#13
L P L Matos, R Cortez-Cardoso, L C Cardoso-Weide, M L Freitas, D L S G Silva, A C F Ferreira
Na(+) /I(-) symporter (NIS) transports iodide into thyrocytes, a fundamental step for thyroid hormone biosynthesis. Our aim was to evaluate NIS regulation in different status of goitrogenesis and its underlying mechanisms. Wistar rats were treated with methimazole (MMI) for 5 and 21 days, to achieve different status of goiter. We then evaluated the effect of MMI removal for 1 day (R1d), after 5 (R1d-5d) or 21 (R1d-21d) days of MMI treatment. MMI increased thyroid weight, iodide uptake and in vitro TPO activity in a time-dependent way...
November 7, 2017: Clinical and Experimental Pharmacology & Physiology
https://www.readbyqxmd.com/read/29101780/thyroid-disrupting-effects-of-halogenated-and-next-generation-chemicals-on-the-swim-bladder-development-of-zebrafish
#14
Amy Godfrey, Blair Hooser, Ahmed Abdelmoneim, Katharine A Horzmann, Jennifer L Freemanc, Maria S Sepúlveda
Endocrine disrupting chemicals (EDCs) can alter thyroid function and adversely affect growth and development. Halogenated compounds, such as perfluorinated chemicals commonly used in food packaging, and brominated flame retardants used in a broad range of products from clothing to electronics, can act as thyroid disruptors. Due to the adverse effects of these compounds, there is a need for the development of safer next generation chemicals. The objective of this study was to test the thyroid disruption potential of old use and next generation halogenated chemicals...
October 28, 2017: Aquatic Toxicology
https://www.readbyqxmd.com/read/29092078/double-blind-placebo-controlled-randomized-trial-of-selenium-in-graves-hyperthyroidism
#15
George J Kahaly, Michaela Riedl, Jochem König, Tanja Diana, Lutz Schomburg
Context: Supplemental selenium (Se) may affect the clinical course of Graves disease (GD). Objective: Evaluate efficacy of add-on Se on medical treatment in GD. Design: Double-blind, placebo-controlled, randomized supplementation trial. Setting: Academic endocrine outpatient clinic. Patients: Seventy untreated hyperthyroid patients with GD. Intervention: Additionally to methimazole (MMI), patients received for 24 weeks either sodium selenite 300 µg/d po or placebo...
November 1, 2017: Journal of Clinical Endocrinology and Metabolism
https://www.readbyqxmd.com/read/29032766/the-effects-of-drug-metabolizing-enzyme-inhibitors-on-hepatic-efflux-and-uptake-transporters
#16
Jonathan Cheong, Jason S Halladay, Jasleen K Sodhi, Emile Plise, Laurent Salphati
BACKGROUND: Non-selective chemical inhibitors of phase I and phase II enzymes are commonly used in in vitro metabolic studies to elucidate the biotransformation pathways of drugs. However, the inhibition of the inhibitors on efflux and uptake transporters is not well investigated, potentially leading to unexpected and ambiguous results in these studies. OBJECTIVE: The commonly used metabolizing enzyme inhibitors, 1-aminobenzotriazole (ABT), SKF-525A, pargyline, allopurinol, menadione, methimazole, piperine and raloxifene, were examined for their potential inhibition of the major hepatic ABC (ATP binding cassette) and SLC (solute carrier) transporters...
October 10, 2017: Drug Metabolism Letters
https://www.readbyqxmd.com/read/29028638/malignant-hyperthermia-versus-thyroid-storm-in-a-patient-with-symptomatic-graves-disease-a-case-report
#17
Sara M Strowd, Michael B Majewski, Jennifer Asteris
Malignant hyperthermia and thyroid storm are intraoperative emergencies with overlapping symptoms but different treatment protocols. We faced this diagnostic dilemma in a 25-year-old patient with symptomatic hyperthyroidism, elevated free T3 and free T4, and low thyroid-stimulating hormone from Graves disease despite treatment with propranolol 80 mg daily and methimazole 40 mg every 8 hours. During thyroidectomy, he developed hyperthermia and hypercarbia without tachycardia. When the rate of rise of PaCO2 and temperature accelerated, we treated the patient for malignant hyperthermia, a diagnosis subsequently confirmed by genetic testing...
October 12, 2017: A & A Case Reports
https://www.readbyqxmd.com/read/29026576/use-of-granulocyte-colony-stimulating-factor-in-the-treatment-of-methimazole-induced-agranulocytosis-a-case-report
#18
Asha Birmingham, Carissa Mancuso, Craig Williams
A comparison of this case to previously published reports suggests that granulocyte colony-stimulating factor may be associated with improved prognosis in severe antithyroid drug-induced neutropenia, and that weight-based doses could be an appropriate strategy.
October 2017: Clinical Case Reports
https://www.readbyqxmd.com/read/29023926/hyperthyroidism-in-patients-with-ischaemic-heart-disease-after-iodine-load-induced-by-coronary-angiography-long-term-follow-up-and-influence-of-baseline-thyroid-functional-status
#19
Nadia Bonelli, Ruth Rossetto, Davide Castagno, Matteo Anselmino, Francesca Vignolo, Mirko Parasiliti Caprino, Fiorenzo Gaita, Ezio Ghigo, Roberto Garberoglio, Roberto Grimaldi, Mauro Maccario
OBJECTIVE: To study the effect of a iodine load on thyroid function of patients with ischaemic heart disease (IHD) and the long-term influence of unknown subclinical hyperthyroidism. CONTEXT: Subclinical hyperthyroidism is considered an independent risk factors for cardiovascular morbidity of patients with IHD. They routinely undergo coronary angiography with iodine contrast media (ICM) which may induce or even worsen hyperthyroidism. DESIGN: A cross-sectional study followed by a longitudinal study on patients with subclinical hyperthyroidism...
October 12, 2017: Clinical Endocrinology
https://www.readbyqxmd.com/read/28964732/effects-of-thyroid-hormone-manipulation-on-pre-nuptial-molt-luteinizing-hormone-and-testicular-growth-in-male-white-crowned-sparrows-zonotrichia-leuchophrys-gambelii
#20
Jonathan H Pérez, Simone L Meddle, John C Wingfield, Marilyn Ramenofsky
Most seasonal species rely on the annual change in day length as the primary cue to appropriately time major spring events such as pre-nuptial molt and breeding. Thyroid hormones are thought to be involved in the regulation of both of these spring life history stages. Here we investigated the effects of chemical inhibition of thyroid hormone production using methimazole, subsequently coupled with either triiodothyronine (T3) or thyroxine (T4) replacement, on the photostimulation of pre-nuptial molt and breeding in Gambel's white-crowned sparrows (Zonotrichia leuchophrys gambelii)...
January 1, 2018: General and Comparative Endocrinology
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