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Methimazole

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https://www.readbyqxmd.com/read/29116146/inactivation-mechanism-of-n61s-mutant-of-human-fmo3-towards-trimethylamine
#1
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
#2
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
#3
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
#4
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
#5
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
#6
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
#7
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-ischemic-heart-disease-after-iodine-load-induced-by-coronary-angiography-long-term-follow-up-and-influence-of-baseline-thyroid-functional-status
#8
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 ischemic 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
#9
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
https://www.readbyqxmd.com/read/28953662/methimazole-induced-liver-injury-overshadowed-by-methylprednisolone-pulse-therapy-case-report
#10
Silvijus Abramavicius, Dzilda Velickiene, Edmundas Kadusevicius
RATIONALE: Treatment choices are limited, when deciding how to manage thyrotoxicosis and moderate to severe Graves ophthalmopathy (GO) with suspected optic nerve damage in patients with elevated liver transaminase levels. The situation become even more complicated, if methimazole induced hepatotoxicity is suspected and intravenous methylprednisolone is co-administrated. PATIENT CONCERNS: A 74-year-old woman presented with spontaneous retro-bulbar pain, eyelid swelling and inconstant diplopia...
September 2017: Medicine (Baltimore)
https://www.readbyqxmd.com/read/28948062/neonatal-graves-disease-with-maternal-hypothyroidism
#11
Gangaram Akangire, Alain Cuna, Charisse Lachica, Ryan Fischer, Sripriya Raman, Venkatesh Sampath
Neonatal Graves' disease presenting as conjugated hyperbilirubinemia is a diagnostic challenge because the differential includes a gamut of liver and systemic diseases. We present a unique case of neonatal Graves' disease in a premature infant with conjugated hyperbilirubinemia born to a mother with hypothyroidism during pregnancy and remote history of Graves' disease. Infant was treated with a combination of methimazole, propranolol, and potassium iodide for 4 weeks. Thyroid function improved after 8 weeks of treatment with full recovery of thyroid function, disappearance of thyroid-stimulating antibodies, and resolution of failure to thrive and conjugated hyperbilirubinemia...
July 2017: American Journal of Perinatology Reports
https://www.readbyqxmd.com/read/28912982/severe-thyrotoxicosis-secondary-to-povidone-iodine-from-peritoneal-dialysis
#12
Kirstie Lithgow, Christopher Symonds
A 73-year-old male on home peritoneal dialysis (PD) with recent diagnosis of atrial fibrillation presented with fatigue and dyspnea. Hyperthyroidism was diagnosed with TSH < 0.01 mIU/L and FT4 > 100 pmol/L. He had no personal or family history of thyroid disease. There had been no exposures to CT contrast, amiodarone, or iodine. Technetium thyroid scan showed diffusely decreased uptake. He was discharged with a presumptive diagnosis of thyroiditis. Three weeks later, he had deteriorated clinically...
2017: Case Reports in Endocrinology
https://www.readbyqxmd.com/read/28878279/changes-in-resting-state-cerebral-activity-in-patients-with-hyperthyroidism-a-short-term-follow-up-functional-mr-imaging-study
#13
Bo Liu, Qian Ran, Daihong Liu, Si Zhang, Dong Zhang
To investigate the brain functional abnormality of hyperthyroid patients before and after treatment for one month using resting-state functional magnetic resonance imaging (rs-fMRI). Amplitude of low-frequency fluctuation (ALFF) and seed-based functional connectivity (FC) analysis were performed in 27 new-onset untreated hyperthyroid patients relative to 30 healthy controls. In addition, follow-up data were available for 19 patients treated with methimazole for one month. Compared with healthy controls, patients exhibited lower ALFF in the right posterior cingulate cortex (PCC); increased FC in the bilateral anterior insula (AI), bilateral posterior insula (PI) and left anterior lobe of the cerebellum (ALC); and decreased FC in the bilateral lateral prefrontal cortex (LPFC), the right medial temporal gyrus (MTG) and the bilateral PCC...
September 6, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28870408/thyroid-storm-and-warm-autoimmune-hemolytic-anemia
#14
Joseph A Moore, Louise Gliga, Srikanth Nagalla
Graves' disease is often associated with other autoimmune disorders, including rare associations with autoimmune hemolytic anemia (AIHA). We describe a unique presentation of thyroid storm and warm AIHA diagnosed concurrently in a young female with hyperthyroidism. The patient presented with nausea, vomiting, diarrhea and altered mental status. Laboratory studies revealed hemoglobin 3.9g/dL, platelets 171×10(9)L(-1), haptoglobin <5mg/dL, reticulocytosis, and positive direct antiglobulin test (IgG, C3d, warm)...
August 18, 2017: Transfusion and Apheresis Science
https://www.readbyqxmd.com/read/28804147/ismp-adverse-drug-reactions-levofloxacin-induced-neuroexcitation-and-hallucinations-statin-induced-muscle-rupture-mefloquine-induced-rhabdomyolysis-methimazole-induced-cholestatic-hepatitis-decitabine-induced-hand-and-foot-syndrome
#15
Michael A Mancano
The purpose of this feature is to heighten awareness of specific adverse drug reactions (ADRs), discuss methods of prevention, and promote reporting of ADRs to the US Food and Drug Administration's (FDA) MedWatch program (800-FDA-1088). If you have reported an interesting, preventable ADR to MedWatch, please consider sharing the account with our readers. Write to Dr. Mancano at ISMP, 200 Lakeside Drive, Suite 200, Horsham, PA 19044 (phone: 215-707-4936; e-mail: mmancano@temple.edu). Your report will be published anonymously unless otherwise requested...
May 2017: Hospital Pharmacy
https://www.readbyqxmd.com/read/28781778/glucose-metabolism-before-and-after-radioiodine-therapy-of-a-patient-with-graves-disease-assessment-by-continuous-glucose-monitoring
#16
Yun Hu, Gu Gao, Reng-Na Yan, Feng-Fei Li, Xiao-Fei Su, Jian-Hua Ma
Hyperthyroidism causes impaired glucose tolerance, insulin resistance (IR) and insulin secretion. However, the glucose variability affected by thyroid dysfunction remains unclear. Glucose variability was assessed by continuous glucose monitoring (CGM) in a non-diabetic patient with Graves' disease (GD), to the best of our knowledge, for the first time. A 28-year-old man with GD, who had been taking methimazole for 4 years, was treated with radioiodine on August 17th 2016. Although the patient exhibited normal glycated hemoglobin (HbA1c; 5...
August 2017: Biomedical Reports
https://www.readbyqxmd.com/read/28780518/birth-defects-after-use-of-antithyroid-drugs-in-early-pregnancy-a-swedish-nationwide-study
#17
Stine Linding Andersen, Stefan Lönn, Peter Vestergaard, Ove Törring
OBJECTIVE: Antithyroid drugs (ATDs) may have teratogenic effects, but more evidence is needed on the risk and types of birth defects after the use of methimazole (MMI) and propylthiouracil (PTU). This study aimed to evaluate the association between the use of ATDs in early pregnancy and birth defects. DESIGN: Swedish nationwide register-based cohort study. METHODS: The study included 684 340 children live-born in Sweden from 2006 to 2012. Exposure groups defined by maternal ATD use in early pregnancy were MMI (n = 162); PTU (n = 218); MMI and PTU (n = 66); ATD before or after, but not in pregnancy (n = 1551) and non-exposed (never ATD (n = 682 343))...
October 2017: European Journal of Endocrinology
https://www.readbyqxmd.com/read/28767416/effect-of-subclinical-hypothyroidism-on-the-skeletal-system-and-improvement-with-short-term-thyroxine-therapy
#18
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...
July 26, 2017: Oncotarget
https://www.readbyqxmd.com/read/28759749/effects-of-long-term-oral-administration-of-methimazole-on-femur-and-tibia-properties-in-male-wistar-rats
#19
Marcin R Tatara, Marcin Gołyński, Radosław P Radzki, Marek Bieńko, Witold Krupski
Physiological concentrations of thyroid hormones are crucial for skeletal growth and development, physiological bone turnover and bone homeostasis maintenance. Methimazole (1-methyl-2-mercaptoimidazole) is an antithyroid drug used for the treatment of the hyperthyroidism in humans and animals. The aim of the study was to determine effects of long-term oral methimazole treatment in male Wistar rats on biochemical bone metabolism markers, as well as morphological, geometric, densitometric and mechanical properties of femur and tibia...
October 2017: Biomedicine & Pharmacotherapy, Biomédecine & Pharmacothérapie
https://www.readbyqxmd.com/read/28750432/hyperthyroidism-in-patients-with-graves-ophthalmopathy-and-thyroidal-skeletal-and-eye-muscle-specific-type-2-deiodinase-enzyme-activities
#20
Ildikó Molnár, József A Szentmiklósi, Éva Somogyiné-Vári
Graves' ophthalmopathy is characterized by hyperthyroidism, which is associated with higher serum T3 levels than T4 due to deiodinase enzymes.The effect of Graves' patient's sera (n=52) with elevated thyroid hormone and TSH receptor or thyroid peroxidase antibody (anti-TPO) levels was investigated on thyroidal, skeletal and eye muscle type 2 deiodinase enzyme (DII) activities. DII activities were measured with (125)I-T4 substrate, while thyroid hormone and antibody levels with immunoassays.In Graves' ophthalmopathy, sera with elevated FT4 or FT3 levels reduced DII activites remarkably in all tissue fractions...
September 2017: Experimental and Clinical Endocrinology & Diabetes
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