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The role of iodine

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https://www.readbyqxmd.com/read/28323998/genes-outside-the-major-histocompatibility-complex-mhc-locus-are-linked-to-the-development-of-thyroid-autoantibodies-and-thyroiditis-in-nod-h2h4-mice
#1
Sandra M McLachlan, Sylvie Lesage, Roxanne Collin, Bianca Banuelos, Holly A Aliesky, Basil Rapoport
Thyroiditis and autoantibodies to thyroglobulin (TgAb) and thyroid peroxidase (TPOAb) develop spontaneously in NOD.H2h4 mice, a phenotype enhanced by dietary iodine. NOD.H2h4 mice were derived by introducing the Major Histocompatibility Class (MHC) molecule I-Ak from B10.A(4R) mice to non-obese diabetic (NOD) mice. Apart from I-Ak, the genes responsible for the NOD.H2h4 phenotype are unknown. Extending serendipitous observations from crossing BALB/c to NOD.H2h4 mice, thyroid autoimmunity was investigated in both genders of the F1, F2 and the second generation backcross of F1 to NOD...
January 17, 2017: Endocrinology
https://www.readbyqxmd.com/read/28315909/a-concise-review-of-hashimoto-thyroiditis-ht-and-the-importance-of-iodine-selenium-vitamin-d-and-gluten-on-the-autoimmunity-and-dietary-management-of-ht-patients-points-that-need-more-investigation
#2
REVIEW
Michael I Liontiris, Elias E Mazokopakis
Hashimoto's thyroiditis (HT) is a chronic autoimmune thyroid disease caused by an interaction between genetic factors and environmental conditions, both of which are yet to be fully understood. The management of HT depends on its clinical manifestations, commonly including diffuse or nodular goiter with euthyroidism, subclinical hypothyroidism and permanent hypothyroidism. However, in most cases of patients with HT, lifelong levothyroxine substitution is required. The additional role of diet for the management of HT is usually overlooked...
March 20, 2017: Hellenic Journal of Nuclear Medicine
https://www.readbyqxmd.com/read/28301171/i2-promoted-povarov-type-reaction-using-1-4-dithane-2-5-diol-as-an-ethylene-surrogate-formal-4-2-synthesis-of-quinolines
#3
Xia Wu, Xiao Geng, Peng Zhao, Jingjing Zhang, Xingxing Gong, Yan-Dong Wu, An-Xin Wu
A highly efficient I2-promoted formal [4 + 2] cycloaddition has been developed for the synthesis of 2-acylquinolines from methyl ketones and arylamines using 1,4-dithane-2,5-diol as an ethylene surrogate. Moreover, the investigation of the mechanism suggested that this reaction occurred via an iodination/Kornblum oxidation/Povarov/aromatization sequence. It is noteworthy that the arylamine substrate also played an important role in promoting the reaction.
March 16, 2017: Organic Letters
https://www.readbyqxmd.com/read/28300409/charge-transport-and-observation-of-persistent-photoconductivity-in-tl6sei4-single-crystals
#4
Sanjib Das, John A Peters, Wenwen Lin, Svetlana S Kostina, Pice Chen, Joon-Il Kim, Mercouri G Kanatzidis, Bruce W Wessels
The chalcohalide compound Tl6SeI4 is a promising wide bandgap semiconductor for efficient hard radiation detection at room temperature due to its high density, average atomic number and mobility-lifetime product. However, the nature of its charge transport kinetics, especially the role of defects in recombination, has not been examined in detail. To determine the charge transport kinetics in Tl6SeI4 single crystals, electrical conductivity and photoinduced current transient spectroscopy were measured over the temperature range of 105-330 K...
March 16, 2017: Journal of Physical Chemistry Letters
https://www.readbyqxmd.com/read/28295509/measuring-tsh-receptor-antibody-trab-to-influence-treatment-choices-in-graves-disease
#5
Asha Hesarghatta Shyamasunder, Prakash Abraham
TSH receptor antibody (TRAb) plays a key role in the pathogenesis of Graves' disease (GD) and its levels correlate with the clinical course. The 2(nd) and 3(rd) generation TRAb assays have >95% sensitivity and specificity for the diagnosis of GD, and have improved the utility of TRAb to predict relapse. TRAb levels decline with antithyroid drug (ATD) therapy and after thyroidectomy. Its level increases for a year following radioactive iodine (RAI) therapy, with a gradual fall thereafter. TRAb level >12 IU/L at diagnosis of GD is associated with 60% risk of relapse at 2 years and 84% at 4 years...
March 13, 2017: Clinical Endocrinology
https://www.readbyqxmd.com/read/28292215/the-role-of-postoperative-stimulated-thyroglobulin-as-prognostic-factor-for-differentiated-thyroid-cancer-in-children-and-adolescents
#6
André B Zanella, Rafael Selbach Scheffel, Marina Pasa, Jose Miguel Dora, Ana Luiza Maia
BACKGROUND: Prognostic factors are essential for risk stratification in patients with differentiated thyroid carcinoma (DTC). The role of stimulated postoperative thyroglobulin (sPOTg) has been well-established in adult DTC population but it remains unclear in children and adolescents. Here, we aimed to evaluate potential prognostic factors in children and adolescents with DTC, with special emphasis on sPOTg analysis. METHODS: Individuals aged 18 years or younger at diagnosis were selected from a cohort of DTC patients attending the thyroid clinic of a tertiary university-based hospital...
March 14, 2017: Thyroid: Official Journal of the American Thyroid Association
https://www.readbyqxmd.com/read/28291381/selimetry-a-multicentre-i-131-dosimetry-trial-a-clinical-perspective
#7
Jonathan Wadsley, Rebecca Gregory, Glenn Flux, Kate Newbold, Yong Du, Laura Moss, Andrew Hall, Louise Flanagan, Sarah R Brown
Treatment options for patients with thyroid cancer that is no longer sensitive to iodine therapy are limited. Those treatments which currently exist are associated with significant toxicity. The SELIMETRY trial (EudraCT No 2015-002269-47) aims to investigate the role of the MEK inhibitor Selumetinib in re-sensitising advanced iodine refractory differentiated thyroid cancer to radioiodine therapy. Patients deemed to have sufficient iodine uptake in previously iodine refractory lesions after 4 weeks of Selumetinib therapy will be given an empirical activity of 5...
March 14, 2017: British Journal of Radiology
https://www.readbyqxmd.com/read/28291009/a-family-with-von-hippel-lindau-syndrome-the-findings-of-indium-111-somatostatin-receptor-scintigraphy-iodine-123-metaiodobenzylguanidine-scintigraphy-and-single-photon-emission-computerized-tomography
#8
Pelin Arıcan, Berna Okudan Tekin, Seniha Naldöken, Rıza Şefizade, Dilek Berker
Von Hippel-Lindau syndrome (VHLS) is an autosomal dominant hereditary familial disorder characterized by development of malignant and benign neoplasms. Differential diagnosis of the adrenal and pancreatic masses are difficult in patients with VHLS. Iodine-123 metaiodobenzylguanidine (I-123 MIBG) and indium-111 somatostatin receptor scintigraphies (In-111 SRS) have important roles in the differential diagnosis of adrenal and pancreatic masses in those patients. In this case report, we present the findings of I-123 MIBG single-photon emission computerized tomography (SPECT/CT) and In-111 SRS SPECT/CT in three members of a family with VHLS...
February 5, 2017: Molecular Imaging and Radionuclide Therapy
https://www.readbyqxmd.com/read/28290237/multiple-nutritional-factors-and-the-risk-of-hashimoto-s-thyroiditis
#9
Shiqian Hu, Margaret P Rayman
Background Hashimoto's Thyroiditis (HT) is considered to be the most common autoimmune disease. It is currently accepted that genetic susceptibility, environmental factors and immune disorders contribute to its development. Regarding nutritional factors, evidence implicates high iodine intake, deficiencies of selenium and iron with a potential relevance of vitamin D status. To elucidate the role of nutritional factors in the risk, pathogenesis and treatment of Hashimoto's Thyroiditis (HT), PubMed and the Cochrane Library were searched for publications on iodine, iron, selenium and vitamin D and risk/treatment of HT...
March 14, 2017: Thyroid: Official Journal of the American Thyroid Association
https://www.readbyqxmd.com/read/28289909/ripk1-ripk3-mlkl-mediated-necroptosis-contributes-to-compression-induced-rat-nucleus-pulposus-cells-death
#10
Songfeng Chen, Xiao Lv, Binwu Hu, Zengwu Shao, Baichuan Wang, Kaige Ma, Hui Lin, Min Cui
The aim of this study was to systematically investigate the role of necroptosis in compression-induced rat nucleus pulposus (NP) cells death, as well as explore the underlying mechanisms involved. Rat NP cells underwent various periods of exposure to 1.0 MPa pressure. Cell viability and cell death were quantified by using cell counting kit-8 (CCK-8), and Calcein-AM/propidium iodine (PI) staining respectively. Necroptosis-associated target molecules receptor-interacing protein kinase 1 (RIPK1), phosphorylated RIPK1 (pRIPK1), receptor-interacing protein kinase 3 (RIPK3), phosphorylated RIPK3 (pRIPK3) and mixed lineage kinase domain-like (MLKL) were analyzed by Western-blot and RT-PCR...
March 13, 2017: Apoptosis: An International Journal on Programmed Cell Death
https://www.readbyqxmd.com/read/28258273/additive-and-reducing-effects-between-calcium-hydroxide-and-current-irrigation-solutions
#11
Zahed Mohammadi, Hamid Jafarzadeh, Sousan Shalavi, Rasoul Sahebalam, Jun Ichiro Kinoshita
Microorganisms should be considered to have the major role in starting and perpetuation of pulpo-periapical diseases. Using intracanal medicaments is necessary to gain a bacteria-free environment in the canal system. Calcium hydroxide (abbreviated as Ca(OH)2), which is the most commonly used medicament in endodontic therapy, has been shown to be effective against primary sources of infection; however, its effectiveness against some microorganisms, such as Candida albicans and Enterococcus faecalis has not been proved...
March 1, 2017: Journal of Contemporary Dental Practice
https://www.readbyqxmd.com/read/28254259/follow-up-of-coronary-artery-patency-after-implantation-of-bioresorbable-coronary-scaffolds-the-emerging-role-of-magnetic-coronary-artery-imaging
#12
REVIEW
Marco Zuin, Gianluca Rigatelli, Fiorenzo Scaranello, Massimo Rinuncini, Claudio Picariello, Katia D'Elia, Majlinda Fejzo, Loris Roncon
Bioresorbable vascular scaffolds (BVSs) represent the newest tool in the treatment of coronary artery disease (CAD). Conversely to the previous metal stents and thanks to the polylactate-based backbone, BVSs could be visualized by magnetic resonance imaging (MRI) without artifacts. These properties allow a potential non-invasive assessment of coronary artery patency after percutaneous coronary intervention (PCI), avoiding cardiac catheterization included iodine contrast and radiation exposure, and potentially more sophisticated imaging tool as the optical coherence tomography (OCT)...
February 7, 2017: Cardiovascular Revascularization Medicine: Including Molecular Interventions
https://www.readbyqxmd.com/read/28240437/halogen-bond-effects-on-the-thermo-and-photochromic-behaviour-of-anil-based-molecular-co-crystals
#13
Andrea Carletta, Floriana Spinelli, Simone d'Agostino, Barbara Ventura, Michele Remo Chierotti, Roberto Gobetto, Johan Wouters, Fabrizia Grepioni
N-salicilideneanilines are among the most studied thermochromic and photochromic systems in the solid state. Although thermochromism is a general property of crystalline N-salicilideneanilines, photochromism is known in a limited number of cases. We report here, as a method for the construction of thermo- and photo-responsive molecular architectures, the co-crystallization of 1,2,4,5-tetrafluoro-3,6-diiodobenzene (I2F4) with three selected imines of o-vanillin, named 1, 2 and 3, obtained via condensation reaction with 3-aminopyridine, 4-bromoaniline and 4-iodoaniline, respectively...
February 27, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28237002/congenital-hypothyroidism-role-of-nuclear-medicine
#14
REVIEW
Isabelle Keller-Petrot, Juliane Leger, Aline Sergent-Alaoui, Claire de Labriolle-Vaylet
Thyroid scintigraphy holds a key place in the etiologic workup of neonatal hypothyroidism. Routine screening for this disorder in maternity hospitals in industrialized countries, for nearly 40 years, has permitted early treatment and thereby helped to prevent its physical and mental complications. Neonatal hypothyroidism affects approximately 1 in 3000 births. The most common causes are abnormal thyroid gland development and defective hormone synthesis by an eutopic thyroid gland. The incidence of the latter has risen in recent years, for reasons that remain unclear...
March 2017: Seminars in Nuclear Medicine
https://www.readbyqxmd.com/read/28229359/thyroid-volume-and-serum-calcitonin-changes-during-pregnancy
#15
G Vannucchi, D Covelli, B Vigo, M Perrino, L Mondina, L Fugazzola
BACKGROUND: Pregnancy has a profound impact on thyroid homeostasis which results in change of thyroid function and thyroid volume (TV). Moreover, calcitonin (CT), and its gene-related peptide have been demonstrated to play an important role in the implantation process. PURPOSE: To evaluate changes in TV and serum CT levels during pregnancy. METHODS: One hundred and fifty-five pregnant women were consecutively enrolled at the first trimester of gestation and underwent clinical, biochemical and sonographic assessment at enrollment, at the second and third trimesters and at 6 months after delivery...
February 22, 2017: Journal of Endocrinological Investigation
https://www.readbyqxmd.com/read/28224254/iodine-deficiency-status-in-the-who-eastern-mediterranean-region-a-systematic-review
#16
REVIEW
Masoumeh Mohammadi, Fereidoun Azizi, Mehdi Hedayati
Iodine deficiency is a global public health issue because iodine plays a major role in the thyroid hormone synthesis and is essential for normal neurological development. This review summarizes the publications on iodine status in the WHO Eastern Mediterranean Region (EMR) countries. All related studies available in main national and international databases were systematically searched using some specific keywords to find article published between 1909 and 2015. The prevention of iodine deficiency disorders (IDDs) in the WHO EMR countries is currently under control without significant side effects...
February 21, 2017: Environmental Geochemistry and Health
https://www.readbyqxmd.com/read/28220998/self-assembly-of-iodine-in-superfluid-helium-droplets-halogen-bonds-and-nanocrystals
#17
Yunteng He, Jie Zhang, Lei Lei, Wei Kong
We present evidence of halogen bond in iodine clusters formed in superfluid helium droplets based on results from electron diffraction. Iodine crystals are known to form layered structures with intralayer halogen bonds, with interatomic distances shorter than the sum of the van der Waals radii of the two neighboring atoms. The diffraction profile of dimer dominated clusters embedded in helium droplets reveals an interatomic distance of 3.65 Å, much closer to the value of 3.5 Å in iodine crystals than to the van der Waals distance of 4...
February 21, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28212640/urinary-iodine-in-early-pregnancy-is-associated-with-subclinical-hypothyroidism-in-tianjin-china-an-observational-study
#18
Kunling Wang, Jie Zhang, Fengao Li, Wanqi Zhang, Hao Wang, Li Ding, Yaxin Liu, Laixiang Lin, Shuang Zhang, Mei Zhu
BACKGROUND: Subclinical hypothyroidism (SH) is associated with adverse obstetric outcomes and neurodevelopment disorders. Both iodine deficiency and excess are associated with SH; however, few data regarding iodine nutrition status of pregnant women with SH are available. This study aimed to clarify whether iodine deficiency or excess is associated with SH, especially, when test results for anti-thyroid autoantibodies are negative. METHODS: A total of 115 women with SH and 104 women with euthyroidism (EH) in early pregnancy in Tianjin, China were investigated, and their serum thyroid-stimulating hormone, free thyroxine, free triiodothyronine, anti-thyroid peroxidase antibody (TPOAb), anti-thyroid globulin antibody (TGAb), urinary iodine (UIC), and urinary creatinine (UCr) concentrations were measured...
February 17, 2017: BMC Endocrine Disorders
https://www.readbyqxmd.com/read/28198752/monoenergetic-dual-energy-computed-tomographic-imaging-cardiothoracic-applications
#19
Lukas Lenga, Moritz H Albrecht, Ahmed E Othman, Simon S Martin, Doris Leithner, Tommaso D'Angelo, Christophe Arendt, Jan-Erik Scholtz, Carlo N De Cecco, U Joseph Schoepf, Thomas J Vogl, Julian L Wichmann
Monoenergetic imaging is an increasingly used reconstruction technique in postprocessing of dual-energy computed tomography (DECT). The main advantage of this technique is the ability to substantially increase image contrast of structures with uptake of iodinated contrast material. Although monoenergetic imaging was mainly used in oncological DECT applications, recent research has further demonstrated its role in vascular imaging. Using this dedicated postprocessing algorithm, image contrast of vascular structures in the thorax can be increased, a drastic reduction of contrast material is feasible, and even beam-hardening artifacts can be reduced...
February 14, 2017: Journal of Thoracic Imaging
https://www.readbyqxmd.com/read/28157283/active-site-binding-is-not-sufficient-for-reductive-deiodination-by-iodotyrosine-deiodinase
#20
Nattha Ingavat, Jennifer M Kavran, Zuodong Sun, Steven E Rokita
The minimal requirements for substrate recognition and turnover by iodotyrosine deiodinase were examined to learn the basis for its catalytic specificity. This enzyme is crucial for iodide homeostasis and the generation of thyroid hormone in chordates. 2-Iodophenol binds only very weakly to the human enzyme and is dehalogenated with a kcat/Km that is more than 4 orders of magnitude lower than that for iodotyrosine. This discrimination likely protects against a futile cycle of iodinating and deiodinating precursors of thyroid hormone biosynthesis...
February 28, 2017: Biochemistry
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