scholarly journals Free Diiodotyrosine Effects on Protein Iodination and Thyroid Hormone Synthesis Catalyzed by Thyroid Peroxidase

1975 ◽  
Vol 51 (2) ◽  
pp. 329-336 ◽  
Author(s):  
Daniele DEME ◽  
Enzo FIMIANI ◽  
Jacques POMMIER ◽  
Jacques NUNEZ
Keyword(s):  
Thyroid Hormone ◽  
Thyroid Peroxidase ◽  
Hormone Synthesis ◽  
Thyroid Hormone Synthesis

Effects of a selenium deficient diet on thyroid function of normal and perchlorate treated rats

1988 ◽  
Vol 118 (4) ◽  
pp. 495-502 ◽  
Author(s):  
J. Golstein ◽  
B. Corvilain ◽  
F. Lamy ◽  
D. Paquer ◽  
J. E. Dumont
Keyword(s):  
Thyroid Hormone ◽  
Tap Water ◽  
Selenium Deficiency ◽  
Thyroid Peroxidase ◽  
Deficient Diet ◽  
Adult Rats ◽  
Pregnant Rats ◽  
Hormone Synthesis ◽  
Thyroid Hormone Synthesis

Abstract. Pregnant rats were submitted to a selenium-deficient diet immediately after mating; it was continued for 4 weeks after delivery. The pups were sacrificed at 3 and 4 weeks of age. Perchlorate, an antithyroid agent inhibiting iodide trapping in the thyroid, was administered via the drinking water to half of the rats. Rats submitted to a normal laboratory diet and to the experimental diet supplemented with selenium were used as controls. The effects of selenium deficiency were an increase in the number of growth abnormalities, growth retardation, and decreased seleno-dependent glutathione peroxidase (GSH-Px) activity in plasma and in various organs. These effects were relieved by selenium supplementation in the diet. Perchlorate treatment induced the classic picture of primary hypothyroidism. Selenium deficiency increased thyroid hormone levels in perchlorate-treated rats and in controls drinking tap water. In the latter group, it also decreased TSH plasma concentration and thyroid weight. These effects were partially reversed by Se supplementation. In vitro experiments, performed on adult rats, revealed increased radioiodide uptake and organification in glands from the rats submitted to the selenium-free diet. Plasma T3 half-life was similar in control and Se-deficient rats. These data suggest a higher efficiency of thyroid hormone synthesis in the thyroids of selenium-deficient rats, despite a lower thyroid stimulation as evaluated by serum TSH. They are compatible with the hypothesis that decreased selenium supply, leading to a decreased GSH-Px in the thyroid, increases hydrogen peroxide steady state level and thus thyroid peroxidase activity and thyroid hormone synthesis.

scholarly journals Resveratrol Alleviates the Inhibitory Effect of Tunicamycin-Induced Endoplasmic Reticulum Stress on Expression of Genes Involved in Thyroid Hormone Synthesis in FRTL-5 Thyrocytes

2021 ◽  
Vol 22 (9) ◽  
pp. 4373
Author(s):  
Gaiping Wen ◽  
Klaus Eder ◽  
Robert Ringseis
Keyword(s):  
Transcription Factor ◽  
Thyroid Hormone ◽  
Er Stress ◽  
Combined Treatment ◽  
Thyroid Peroxidase ◽  
Sodium Iodide Symporter ◽  
Hormone Synthesis ◽  
Thyroid Hormone Synthesis ◽  
Expression Of Genes ◽  
Thyroid Transcription Factor

Recently, ER stress induced by tunicamycin (TM) was reported to inhibit the expression of key genes involved in thyroid hormone synthesis, such as sodium/iodide symporter (NIS), thyroid peroxidase (TPO) and thyroglobulin (TG), and their regulators such as thyrotropin receptor (TSHR), thyroid transcription factor-1 (TTF-1), thyroid transcription factor-2 (TTF-2) and paired box gene 8 (PAX-8), in FRTL-5 thyrocytes. The present study tested the hypothesis that resveratrol (RSV) alleviates this effect of TM in FRTL-5 cells. While treatment of FRTL-5 cells with TM alone (0.1 µg/mL) for 48 h strongly induced the ER stress-sensitive genes heat shock protein family A member 5 (HSPA5) and DNA damage inducible transcript 3 (DDIT3) and repressed NIS, TPO, TG, TSHR, TTF-1, TTF-2 and PAX-8, combined treatment with TM (0.1 µg/mL) and RSV (10 µM) for 48 h attenuated this effect of TM. In conclusion, RSV alleviates TM-induced ER stress and attenuates the strong impairment of expression of genes involved in thyroid hormone synthesis and their regulators in FRTL-5 thyrocytes exposed to TM-induced ER stress. Thus, RSV may be useful for the treatment of specific thyroid disorders, provided that strategies with improved oral bioavailability of RSV are applied.

scholarly journals Thyroid peroxidase-induced thyroid hormone synthesis in relation to thyroglobulin structure

FEBS Letters ◽  
1979 ◽  
Vol 102 (1) ◽  
pp. 82-86 ◽  
Author(s):  
Jean-Claude Maurizis ◽  
Claudine Marriq ◽  
Josette Michelot ◽  
Marcel Rolland ◽  
Serge Lissitzky
Keyword(s):  
Thyroid Hormone ◽  
Thyroid Peroxidase ◽  
Hormone Synthesis ◽  
Thyroid Hormone Synthesis

Congenital Hypothyroidism, Dwarfism, and Hearing Impairment Caused by a Missense Mutation in the Mouse Dual Oxidase 2 Gene, Duox2

2007 ◽  
Vol 21 (7) ◽  
pp. 1593-1602 ◽  
Author(s):  
Kenneth R. Johnson ◽  
Coleen C. Marden ◽  
Patricia Ward-Bailey ◽  
Leona H. Gagnon ◽  
Roderick T. Bronson ◽  
...  
Keyword(s):  
Thyroid Hormone ◽  
Congenital Hypothyroidism ◽  
Genetic Model ◽  
Mutant Mice ◽  
Tectorial Membrane ◽  
Thyroid Peroxidase ◽  
Hormone Synthesis ◽  
Thyroid Hormone Synthesis ◽  
Organ Systems ◽  
Dual Oxidase

Abstract Dual oxidases generate the hydrogen peroxide needed by thyroid peroxidase for the incorporation of iodine into thyroglobulin, an essential step in thyroid hormone synthesis. Mutations in the human dual oxidase 2 gene, DUOX2, have been shown to underlie several cases of congenital hypothyroidism. We report here the first mouse Duox2 mutation, which provides a new genetic model for studying the specific function of DUOX2 in the thyroid gland and in other organ systems where it is hypothesized to play a role. We mapped the new spontaneous mouse mutation to chromosome 2 and identified it as a T>G base pair change in exon 16 of Duox2. The mutation changes a highly conserved valine to glycine at amino acid position 674 (V674G) and was named “thyroid dyshormonogenesis” (symbol thyd) to signify a defect in thyroid hormone synthesis. Thyroid glands of mutant mice are goitrous and contain few normal follicles, and anterior pituitaries are dysplastic. Serum T4 in homozygotes is about one-tenth the level of controls and is accompanied by a more than 100-fold increase in TSH. The weight of adult mutant mice is approximately half that of littermate controls, and serum IGF-I is reduced. The cochleae of mutant mice exhibit abnormalities characteristic of hypothyroidism, including a delayed formation of the inner sulcus and tunnel of Corti and an abnormally thickened tectorial membrane. Hearing thresholds of adult mutant mice are on average 50–60 decibels (dB) above those of controls.

Research Paper Effects of 13-HPODE on Expression of Genes Involved in Thyroid Hormone Synthesis, Iodide Uptake and Formation of Hydrogen Peroxide in Porcine Thyrocytes

2006 ◽  
Vol 76 (6) ◽  
pp. 398-406 ◽  
Author(s):  
Luci ◽  
Bettzieche ◽  
Eder
Keyword(s):  
Hydrogen Peroxide ◽  
Linoleic Acid ◽  
Thyroid Hormone ◽  
Thyroid Hormones ◽  
Thyroid Peroxidase ◽  
Iodide Uptake ◽  
Hormone Synthesis ◽  
Thyroid Hormone Synthesis ◽  
Expression Of Genes ◽  
Production Of Hydrogen

It has been shown that dietary oxidized fats influence thyroid function in rats and pigs. Mechanisms underlying this phenomenon are unknown. This study was performed to investigate whether 13-hydroperoxy-9,11-octadecadienic acid (13-HPODE), a primary oxidation product of linoleic acid, affects expression of genes involved in thyroid hormone synthesis and formation of hydrogen peroxide in primary porcine thyrocytes. Thyrocytes were treated with 13-HPODE in concentrations between 20 and 100 μM. Cells treated with vehicle alone ("control cells") or with equivalent concentrations of linoleic acid were considered as controls. Treatment of cells with 13-HPODE did not affect cell viability but increased the activities of the antioxidant enzymes superoxide dismutase and glutathione peroxidase (p < 0.05) compared to control cells or cells treated with linoleic acid. Relative mRNA concentrations of genes involved in thyroid hormone synthesis like sodium iodide symporter, thyrotropin receptor, and thyroid peroxidase, as well as iodide uptake, did not differ between cells treated with 13-HPODE and control cells or cells treated with linoleic acid. Treatment of cells with 13-HPODE, however, reduced the relative mRNA concentrations of dual oxidase-2 and the formation of hydrogen peroxide compared to control cells or cells treated with linoleic acid (p < 0.05). Because the production of hydrogen peroxide is rate-limiting for the synthesis of thyroid hormones, it is suggested that 13-HPODE could have an impact on the formation of thyroid hormones in the thyroid gland.

scholarly journals Bioinorganic Chemistry in Thyroid Gland: Effect of Antithyroid Drugs on Peroxidase-Catalyzed Oxidation and Iodination Reactions

2006 ◽  
Vol 2006 ◽  
pp. 1-9 ◽  
Author(s):  
Gouriprasanna Roy ◽  
G. Mugesh
Keyword(s):  
Thyroid Hormone ◽  
Thyroid Gland ◽  
Bioinorganic Chemistry ◽  
Antithyroid Drugs ◽  
Thyroid Peroxidase ◽  
Current Interest ◽  
Hormone Synthesis ◽  
Thyroid Hormone Synthesis ◽  
Interesting Compound ◽  
Catalyzed Oxidation

Propylthiouracil (PTU) and methimazole (MMI) are the most commonly used antithyroid drugs. The available data suggest that these drugs may block the thyroid hormone synthesis by inhibiting the thyroid peroxidase (TPO) or diverting oxidized iodides away from thyroglobulin. It is also known that PTU inhibits the selenocysteine-containing enzyme ID-1 by reacting with the selenenyl iodide intermediate (E-SeI). In view of the current interest in antithyroid drugs, we have recently carried out biomimetic studies to understand the mechanism by which the antithyroid drugs inhibit the thyroid hormone synthesis and found that the replacement of sulfur with selenium in MMI leads to an interesting compound that may reversibly block the thyroid hormone synthesis. Our recent results on the inhibition of lactoperoxidase (LPO)-catalyzed oxidation and iodination reactions by antithyroid drugs are described.

scholarly journals Association of Duoxes with Thyroid Peroxidase and Its Regulation in Thyrocytes

2010 ◽  
Vol 95 (1) ◽  
pp. 375-382 ◽  
Author(s):  
Yue Song ◽  
Jean Ruf ◽  
Philippe Lothaire ◽  
Didier Dequanter ◽  
Guy Andry ◽  
...  
Keyword(s):  
Thyroid Hormone ◽  
Protein Kinase ◽  
Plasma Membranes ◽  
Cell Damage ◽  
Thyroid Tissue ◽  
Human Thyroid ◽  
Thyroid Peroxidase ◽  
Thyroid Cells ◽  
Hormone Synthesis ◽  
Thyroid Hormone Synthesis

Abstract Context: Thyroid hormone synthesis requires H2O2 produced by dual oxidases (Duoxes) and thyroperoxidase (TPO). Defects in this system lead to congenital hypothyroidism. H2O2 damage to the thyrocytes may be a cause of cancer. Objective: The objective of the study was to investigate whether Duox and TPO, the H2O2 producer and consumer, might constitute a complex in the plasma membrane of human thyroid cells, thus maximizing efficiency and minimizing leakage and damage. Design: The interaction between Duox and TPO was studied by coimmunoprecipitation and Western blotting of plasma membranes from incubated follicles prepared from freshly resected human thyroid tissue from patients undergoing thyroidectomy, and COS-7 cells transiently transfected with the entire Duoxes or truncated [amino (NH2) or carboxyl (COOH) terminal]. Results: The following results were reached: 1) Duox and TPO from membranes are coprecipitated, 2) this association is up-regulated through the Gq-phospholipase C-Ca2+-protein kinase C pathway and down-regulated through the Gs-cAMP-protein kinase A pathway, 3) H2O2 increases the association of Duox1 and Duox2 to TPO in cells and in membranes, and 4) truncated NH2- or COOH-terminal Duox1 and Duox2 proteins show different binding abilities with TPO. Conclusion: Coimmunoprecipitations show that Duox and TPO locate closely in the plasma membranes of human thyrocytes, and this association can be modulated by H2O2, optimizing working efficiency and minimizing H2O2 spillage. This association could represent one part of a postulated pluriprotein complex involved in iodination. This suggests that defects in this association could impair thyroid hormone synthesis and lead to thyroid insufficiency and cell damage.

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