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thyrotropin receptor

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https://www.readbyqxmd.com/read/28065941/di2-ethylhexyl-phthalate-disrupts-thyroid-hormone-homeostasis-through-activating-the-ras-akt-trhr-pathway-and-inducing-hepatic-enzymes
#1
Hanfeng Ye, Mei Ha, Min Yang, Ping Yue, Zhengyuan Xie, Changjiang Liu
Di(2-ethylhexyl) phthalate (DEHP), as a widespread environmental pollutant and an endocrine disruptor, can disturb the homeostasis of thyroid hormones (THs). In order to elucidate roles of the MAPK and PI3K/Akt pathways and hepatic enzymes in thyroid-disrupting effects of DEHP, Sprague-Dawley rats were dosed with DEHP by gavage for 30 consecutive days; Nthy-ori 3-1 cells were treated with DEHP with NAC, k-Ras siRNA or inhibitors (U0126 and wortmannin). Results showed that DEHP led to histopathologic changes in rat thyroid and liver, such as the decrease in thyroid follicular cavity diameter, hepatocyte edema...
January 9, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28063130/glucocorticoids-curtail-stimuli-induced-creb-phosphorylation-in-trh-neurons-through-interaction-of-the-glucocorticoid-receptor-with-the-catalytic-subunit-of-protein-kinase-a
#2
Israim Sotelo-Rivera, Antonieta Cote-Vélez, Rosa-María Uribe, Jean-Louis Charli, Patricia Joseph-Bravo
PURPOSE: Corticosterone prevents cold-induced stimulation of thyrotropin-releasing hormone (Trh) expression in rats, and the stimulatory effect of dibutyryl cyclic-adenosine monophosphate (dB-cAMP) on Trh transcription in hypothalamic cultures. We searched for the mechanism of this interference. METHODS: Immunohistochemical analyses of phosphorylated cAMP-response element binding protein (pCREB) were performed in the paraventricular nucleus (PVN) of Wistar rats, and in cell cultures of 17-day old rat hypothalami, or neuroblastoma SH-SY5Y cells...
January 6, 2017: Endocrine
https://www.readbyqxmd.com/read/28061802/thyrotropin-producing-pituitary-adenoma-simultaneously-existing-with-graves-disease-a-case-report
#3
Nobuhiko Arai, Makoto Inaba, Takamasa Ichijyo, Hiroshi Kagami, Yutaka Mine
BACKGROUND: Thyrotropin-producing pituitary tumor is relatively rare. In particular, concurrent cases associated with Graves' disease are extremely rare and only nine cases have been reported so far. We describe a case of a thyrotropin-producing pituitary adenoma concomitant with Graves' disease, which was successfully treated. CASE PRESENTATION: A 40-year-old Japanese woman presented with mild signs of hyperthyroidism. She had positive anti-thyroid-stimulating hormone receptor antibody, anti-thyroglobulin antibody, and anti-thyroid peroxidase antibody...
January 6, 2017: Journal of Medical Case Reports
https://www.readbyqxmd.com/read/28054989/effects-of-long-term-in-vivo-exposure-to-di-2-ethylhexylphthalate-on-thyroid-hormones-and-the-tsh-tshr-signaling-pathways-in-wistar-rats
#4
Xinwen Dong, Jin Dong, Yue Zhao, Jipeng Guo, Zhanju Wang, Mingqi Liu, Yunbo Zhang, Xiaolin Na
Di-(2-ethylhexyl)phthalate (DEHP) was a widely used chemical with human toxicity. Recent in vivo and in vitro studies suggested that DEHP-exposure may be associated with altered serum thyroid hormones (THs) levels, but the underlying molecular mechanisms were largely unknown. To explore the possible molecular mechanisms, 128 Wistar rats were dosed with DEHP by gavage at 0, 150, 300, and 600 mg/kg/day for 3 months (M) and 6 M, respectively. After exposure, expression of genes and proteins in the thyroid, pituitary, and hypothalamus tissues of rats were analyzed by Q-PCR and western blot, while the sera and urine samples were assayed by radioimmunoassay and ELISA...
January 4, 2017: International Journal of Environmental Research and Public Health
https://www.readbyqxmd.com/read/28002738/construction-of-structural-mimetics-of-the-thyrotropin-receptor-intracellular-domain
#5
Olga Press, Tatiana Zvagelsky, Maria Vyazmensky, Gunnar Kleinau, Stanislav Engel
The signaling of a G protein-coupled receptor (GPCR) is dictated by the complementary responsiveness of interacting intracellular effectors such as G proteins. Many GPCRs are known to couple to more than one G protein subtype and induce a multitude of signaling pathways, although the in vivo relevance of particular pathways is mostly unrecognized. Dissecting GPCR signaling in terms of the pathways that are activated will boost our understanding of the molecular fundamentals of hormone action. The structural determinants governing the selectivity of GPCR/G protein coupling, however, remain obscure...
December 20, 2016: Biophysical Journal
https://www.readbyqxmd.com/read/27987211/inhibiting-thyrotropin-insulin-like-growth-factor-1-receptor-crosstalk-to-treat-graves-ophthalmopathy-studies-in-orbital-fibroblasts-in-vitro
#6
Robert F Place, Christine C Krieger, Susanne Neumann, Marvin C Gershengorn
BACKGROUND AND PURPOSE: Crosstalk between the thyrotropin (TSH) receptor (TSHR) and the insulin-like growth factor 1 receptor (IGF-1R) initiated by activation of TSHR may play a prominent role in the development of Graves' ophthalmopathy (GO). Specifically, we have shown that TSHR activation alone is sufficient to stimulate hyaluronan (HA) secretion, a major component of GO, through both IGF-1R-dependent and -independent pathways. Although an anti-IGF-1R antibody is in clinical trial, its effectiveness hinges on the relative importance of IGF-1R versus TSHR signaling in GO pathogenesis...
December 17, 2016: British Journal of Pharmacology
https://www.readbyqxmd.com/read/27986127/irisin-and-myostatin-levels-in-patients-with-graves-disease
#7
Mehmet Muhittin Yalcin, Mujde Akturk, Yusuf Tohma, Ethem Turgay Cerit, Alev Eroglu Altinova, Emre Arslan, Ilhan Yetkin, Fusun Balos Toruner
BACKGROUND AND AIMS: Skeletal muscle system, which is one of the primary targets for thyroid hormones, has an important role in energy metabolism. Some myokines such as irisin and myostatin have considerable effects on energy metabolism in addition to the musculoskeletal system. Our aim was to investigate circulating irisin and myostatin levels in patients with Graves' Disease (GD). METHODS: This study included 41 patients with GD who were in overt hyperthyroid status and 44 healthy subjects...
August 2016: Archives of Medical Research
https://www.readbyqxmd.com/read/27927064/clinical-efficacy-of-yingliu-mixture-combined-with-metimazole-for-treating-diffuse-goitre-with-hyperthyroidism-and-its-impact-on-related-cytokines
#8
Hua Yang, Yilei Cong, Tengfei Wu, Hong Tang, Muhao Ma, Juanhua Zeng, Wenya Zhang, Zhen Lian, Xinyu Yang
CONTEXT: Yingliu mixture was developed in 1990s by Affiliated Longhua Hospital of Shanghai University of Traditional Chinese Medicine, for treating diffuse goitre with hyperthyroidism (Graves' disease, GD). Former studies have shown Yingliu mixture combined with methimazole (Y-M) can effectively improve thyroid function and decrease thyrotropin-receptor antibody level. Furthermore, we researched its impact on related cytokines to prove that Y-M improve patients' immunity status. OBJECTIVE: To observe the clinical efficacy of Y-M for treating GD...
December 2017: Pharmaceutical Biology
https://www.readbyqxmd.com/read/27913646/critical-differences-between-induced-and-spontaneous-mouse-models-of-graves-disease-with-implications-for-antigen-specific-immunotherapy-in-humans
#9
Basil Rapoport, Bianca Banuelos, Holly A Aliesky, Nicole Hartwig Trier, Sandra M McLachlan
Graves' hyperthyroidism, a common autoimmune disease caused by pathogenic autoantibodies to the thyrotropin (TSH) receptor (TSHR), can be treated but not cured. This single autoantigenic target makes Graves' disease a prime candidate for Ag-specific immunotherapy. Previously, in an induced mouse model, injecting TSHR A-subunit protein attenuated hyperthyroidism by diverting pathogenic TSHR Abs to a nonfunctional variety. In this study, we explored the possibility of a similar diversion in a mouse model that spontaneously develops pathogenic TSHR autoantibodies, NOD...
December 15, 2016: Journal of Immunology: Official Journal of the American Association of Immunologists
https://www.readbyqxmd.com/read/27906859/recent-advances-in-nuclear-medicine-in-endocrine-oncology
#10
Markus Luster, Andreas Pfestroff, Frederik A Verburg
PURPOSE OF REVIEW: The purpose is to review recent advances concerning the role of nuclear medicine in endocrine oncology. RECENT FINDINGS: For I therapy of thyroid cancer a thyrotropin (TSH) more than 30 mU/l has for many years been deemed a condition sine qua non. However, new data show that patients with lower TSH levels at the time of ablation have the same rate of successful ablation as those with TSH more than 30 mU/l.I-124 combined integrated positron emission tomography and computed X-ray tomography was shown to be highly accurate in predicting findings on posttherapy radioiodine scanning and was shown to have a high prognostic power...
January 2017: Current Opinion in Oncology
https://www.readbyqxmd.com/read/27864993/thyrotropin-alters-t-cell-development-in-the-thymus-in-subclinical-hypothyroidism-mouse-model
#11
Kunpeng Wu, Meng Zhao, Chunyan Ma, Haiqing Zhang, Xiaojing Liu, Lingyan Zhou, Jiajun Zhao, Ling Gao, Dan Wang
Subclinical hypothyroidism (SCH) is highly prevalent in the general population and is associated with potential deleterious effects. Although developing T cells express thyroid stimulating hormone receptor (TSH-R), the changes of T cell development in thymus in SCH have not been fully clarified. SCH mouse model, which is characterized by elevated serum TSH but similar thyroid hormone levels, were used to study the role of TSH in T cell development. Thymus weight of SCH mice increased 18% compared with controls...
November 16, 2016: Scandinavian Journal of Immunology
https://www.readbyqxmd.com/read/27825413/risk-factors-of-lymphnode-metastasis-in-patients-with-thyroid-br-papillary-carcinoma-associated-with-graves-disease
#12
Yong Xie, Yue-Wu Liu, Meng-Yi Wang, Wen-Ze Wang, Hong-Feng Liu, Xiao-Yi Li, Wei-Sheng Gao
Objective To summarize the characteristics of lymph node metastasis in patients with papillary thyroid carcinoma accompanied with Graves disease,and to provide evidence for clinical treatment. Methods Totally 98 patients with papillary thyroid carcinoma and Graves disease who had been treated in Peking Union Medical College Hospital from January 2004 to December 2013 were divided into the lymph node metastasis positive group (n=34) and lymph node metastasis negative group (n=64). The general information,blood biochemical results,pathological results,and prognoses were compared between these two groups...
October 10, 2016: Zhongguo Yi Xue Ke Xue Yuan Xue Bao. Acta Academiae Medicinae Sinicae
https://www.readbyqxmd.com/read/27821020/duox2-gene-mutation-manifesting-as-resistance-to-thyrotropin-phenotype
#13
Panudda Srichomkwun, Junta Takamatsu, Deborah A Nickerson, Michael J Bamshad, Jessica X Chong, Samuel Refetoff
Resistance to thyrotropin (TSH) (RTSH; defined by elevated TSH and a normal or hypoplastic thyroid gland) can be caused by mutations in genes encoding the TSH receptor and PAX8, and it has been linked to a locus on chromosome 15. In two nonconsanguineous families with nongoitrous euthyroid hyperthyrotropinemia, typical of the RTSH phenotype, exome analysis identified five rare DUOX2 gene variants (p.A649E, p.P1391A, p.R885L, p.G488R, and p.SF965-6SfsX29) found to be pathogenic. This form of nongoitrous dyshormonogenesis masquerades both clinically and biochemically as RTSH...
December 7, 2016: Thyroid: Official Journal of the American Thyroid Association
https://www.readbyqxmd.com/read/27810496/common-phenotype-and-different-non-hla-genes-in-graves-disease-and-alopecia-areata
#14
Yasunori Taketomo, Shinsuke Noso, Naru Babaya, Yoshihisa Hiromine, Hiroyuki Ito, Kousei Kanto, Fumimaru Niwano, Naoki Oiso, Akira Kawada, Yumiko Kawabata, Hiroshi Ikegami
Our previous observations clarified that Graves' disease (GD) is the most frequent autoimmune disease in patients with alopecia areata (AA), and 42.7% of patients with AA were positive for thyrotropin receptor antibody (TRAb). A class II HLA haplotype DRB1∗15:01-DQB1∗06:02 was suggested to contribute to autoimmunity against the thyroid gland in AA. To further clarify the genetic factors contributing to organ specificity in autoimmune diseases, we studied the contribution of non-HLA genes to organ specificity in GD and AA...
October 31, 2016: Human Immunology
https://www.readbyqxmd.com/read/27768856/elevated-serum-tetrac-in-graves-disease-potential-pathogenic-role-in-thyroid-associated-ophthalmopathy
#15
Roshini Fernando, Ekaterina Placzek, Edmund A Reese, Andrew T Placzek, Samantha Schwartz, Aaron Trierweiler, Leslie M Niziol, Stephen Atkins, Thomas S Scanlan, Terry J Smith
CONTEXT: The sources and biological impact of 3,3',5,5' tetraiodothyroacetic acid (TA4) are uncertain. CD34(+) fibrocytes express several proteins involved in the production of thyroid hormones. They infiltrate the orbit in Graves' disease (GD), an autoimmune process known as thyroid-associated ophthalmopathy. It appears that the thyrotropin receptor (TSHR) plays an important role in the pathogenesis of TAO. OBJECTIVE: To quantify levels of TA4 in healthy subjects and those with Graves' disease...
October 21, 2016: Journal of Clinical Endocrinology and Metabolism
https://www.readbyqxmd.com/read/27737479/thyroid-peroxidase-antibodies-in-non-autoimmune-hyperthyroidism-treated-with-radioactive-iodine
#16
M H Listewnik, M J Listewnik, T Miazgowski, K Jaskólska, K Jasiakiewicz, B Birkenfeld
Introduction: Earlier studies suggest increased serum levels of thyroid peroxidase antibodies (TPOAb) in some cases with non-autoimmune hyperthyroidism. The aim of the study was to assess the incidence of hypothyroidism in patients with nodular toxic goitre and toxic adenoma at 12 months after radioactive iodine therapy in the relation to TPOAb levels. Patients & Measurements: The study comprised 100 patients (83 females; 17 males) treated with radioactive iodine therapy. Serum concentrations of thyrotropin, free thyroxin, TPOAb, and anti-TSH receptor antibodies were assessed at baseline and 12 months after radioactive iodine therapy...
October 2016: Experimental and Clinical Endocrinology & Diabetes
https://www.readbyqxmd.com/read/27737329/coexistence-of-resistance-to-thyroid-hormone-and-ectopic-thyroid-ten-year-follow-up
#17
Man-Li Guo, Xiao Zheng, Liu-Xue Yang, Ya-Li Qiu, Liang Cheng, Shao-Gang Ma
Resistance to thyroid hormone (RTH) coexisting with ectopic thyroid is rare. Here we report a case of RTH with ectopic thyroid. A ten-year-old girl had been misdiagnosed as congenital hypothyroidism and treated with levothyroxine since she was born. Ten-year follow-up showed that the elevated thyrotropin was never suppressed by levothyroxine and no signs indicating hyperthyroidism or hypothyroidism despite elevated FT3 and FT4 levels. Therefore the girl developed no defects in physical and cognitive development...
November 2016: Archives of Endocrinology and Metabolism
https://www.readbyqxmd.com/read/27688483/a-long-lived-mouse-lacking-both-growth-hormone-and-growth-hormone-receptor-a-new-animal-model-for-aging-studies
#18
Adam Gesing, Denise Wiesenborn, Andrew Do, Vinal Menon, Augusto Schneider, Berta Victoria, Michael B Stout, John J Kopchick, Andrzej Bartke, Michal M Masternak
Disruption of the growth hormone (GH) signaling pathway promotes insulin sensitivity and is associated with both delayed aging and extended longevity. Two kinds of long-lived mice-Ames dwarfs (df/df) and GH receptor gene-disrupted knockouts (GHRKO) are characterized by a suppressed GH axis with a significant reduction of body size and decreased plasma insulin-like growth factor-1 (IGF-1) and insulin levels. Ames dwarf mice are deficient in GH, prolactin, and thyrotropin, whereas GHRKOs are GH resistant and are dwarf with decreased circulating IGF-1 and increased GH...
September 29, 2016: Journals of Gerontology. Series A, Biological Sciences and Medical Sciences
https://www.readbyqxmd.com/read/27681724/interactions-between-two-different-g-protein-coupled-receptors-in-reproductive-hormone-producing-cells-the-role-of-pacap-and-its-receptor-pac1r
#19
Haruhiko Kanasaki, Aki Oride, Tomomi Hara, Tselmeg Mijiddorj, Unurjargal Sukhbaatar, Satoru Kyo
Gonadotropin-releasing hormone (GnRH) and gonadotropins are indispensable hormones for maintaining female reproductive functions. In a similar manner to other endocrine hormones, GnRH and gonadotropins are controlled by their principle regulators. Although it has been previously established that GnRH regulates the synthesis and secretion of luteinizing hormone (LH) and follicle-stimulating hormone (FSH)-both gonadotropins-from pituitary gonadotrophs, it has recently become clear that hypothalamic GnRH is under the control of hypothalamic kisspeptin...
2016: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/27638195/thyrotropin-and-insulin-like-growth-factor-1-receptor-crosstalk-upregulates-sodium-iodide-symporter-expression-in-primary-cultures-of-human-thyrocytes
#20
Sarah J Morgan, Susanne Neumann, Bernice Marcus-Samuels, Marvin C Gershengorn
BACKGROUND: Major regulation of thyroid gland function is mediated by thyrotropin (TSH) activating the TSH receptor (TSHR) and inducing upregulation of genes involved in thyroid hormone synthesis. Evidence suggests that the insulin-like growth factor 1 (IGF-1) receptor (IGF-1R) may play a role in regulating TSHR functional effects. This study examined the potential role of TSHR/IGF-1R crosstalk in primary cultures of human thyrocytes. RESULTS: TSH/IGF-1 co-treatment elicited additive effects on thyroglobulin (TG), thyroperoxidase (TPO), and deiodinase type 2 (DIO2) mRNA levels but synergistic effects on sodium-iodide symporter (NIS) mRNA...
December 2016: Thyroid: Official Journal of the American Thyroid Association
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