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https://www.readbyqxmd.com/read/28338000/cavity-filling-mutations-at-the-thyroxine-binding-site-dramatically-increase-transthyretin-stability-and-prevent-its-aggregation
#1
Ricardo Sant'Anna, Maria Rosário Almeida, Nathalia Varejāo, Pablo Gallego, Sebastian Esperante, Priscila Ferreira, Alda Pereira-Henriques, Fernando L Palhano, Mamede de Carvalho, Debora Foguel, David Reverter, Maria João Saraiva, Salvador Ventura
More than a hundred different Transthyretin (TTR) mutations are associated with fatal systemic amyloidoses. They destabilize the protein tetrameric structure and promote the extracellular deposition of TTR as pathological amyloid fibrils. So far, only mutations R104H and T119M have been shown to stabilize significantly TTR, acting as disease suppressors. We describe a novel A108V non-pathogenic mutation found in a Portuguese subject. This variant is more stable than wild type TTR both in vitro and in human plasma, a feature that prevents its aggregation...
March 24, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28333968/a-genome-wide-association-study-of-thyroid-stimulating-hormone-and-free-thyroxine-in-danish-children-and-adolescents
#2
Tenna Ruest Haarmark Nielsen, Emil Vincent Rosenbaum Appel, Mathilde Svendstrup, Johanne Dam Ohrt, Maria Dahl, Cilius Esmann Fonvig, Mette Hollensted, Christian Theil Have, Haja N Kadarmideen, Oluf Pedersen, Torben Hansen, Jens-Christian Holm, Niels Grarup
BACKGROUND: Hypothyroidism is associated with obesity, and thyroid hormones are involved in the regulation of body composition, including fat mass. Genome-wide association studies (GWAS) in adults have identified 19 and 6 loci associated with plasma concentrations of thyroid stimulating hormone (TSH) and free thyroxine (fT4), respectively. OBJECTIVE: This study aimed to identify and characterize genetic variants associated with circulating TSH and fT4 in Danish children and adolescents and to examine whether these variants associate with obesity...
2017: PloS One
https://www.readbyqxmd.com/read/28333900/-the-influence-of-hypothyroidism-on-the-conversion-and-binding-of-thyroid-hormones-in-patients-with-end-stage-renal-disease
#3
Iwanna Dubczak, Longin Niemczyk, Zbigniew Bartoszewicz, Katarzyna Szamotulska, Marek Saracyn, Stanisław Niemczyk
Hypothyroidism in patients with renal failure (RF) causes many metabolic and clinical problems, and both these diseases can mutually exacerbate their disturbances. AIM: The aim of this study was to evaluate the effect of hypothyroidism, and end-stage renal disease (ESRD) on conversion of thyroid hormones (TH) in patients with ESRD treated with chronic hemodialysis (HD). MATERIALS AND METHODS: The study was performed in 74 patients, including 41 women (K) and 33 men (M) aged 28-83 y...
March 21, 2017: Polski Merkuriusz Lekarski: Organ Polskiego Towarzystwa Lekarskiego
https://www.readbyqxmd.com/read/28333271/impact-of-thyroid-autoimmunity-in-euthyroid-women-on-live-birth-rate-after-iui
#4
D Unuane, B Velkeniers, B Bravenboer, P Drakopoulos, H Tournaye, J Parra, M De Brucker
STUDY QUESTION: Does thyroid autoimmunity (TAI) predict live birth rate in euthyroid women after one treatment cycle in IUI patients? SUMMARY ANSWER: TAI as such does not influence pregnancy outcome after IUI treatment. WHAT IS KNOWN ALREADY: The role of TAI on pregnancy outcome in the case of IVF/ICSI is largely debated in the literature. This is the first study to address this issue in the case of IUI. STUDY DESIGN, SIZE, DURATION: This was a retrospective cohort study...
February 23, 2017: Human Reproduction
https://www.readbyqxmd.com/read/28329380/subclinical-thyroid-dysfunction-and-cardiovascular-diseases-2016-update
#5
Carmen Floriani, Baris Gencer, Tinh-Hai Collet, Nicolas Rodondi
Subclinical thyroid dysfunction comprises subclinical hypothyroidism (SHypo), defined as elevated thyroid-stimulating hormone (TSH) by normal free thyroxine (FT4), and subclinical hyperthyroidism (SHyper) with decreased or undetectable TSH and normal FT4. Up to 10% of the elderly have SHypo, which is usually asymptomatic. Individual participant data (IPD) analyses of prospective cohort studies from the international Thyroid Studies Collaboration show that SHypo is associated with increased coronary heart disease (CHD) mortality [hazard ratio (HR) 1,58 for TSH ≥ 10 mIU/L, 95% CI 1...
February 27, 2017: European Heart Journal
https://www.readbyqxmd.com/read/28327686/thyroid-hormone-profile-in-patients-with-chronic-kidney-disease-a-single-centre-study
#6
S Singh, A Verma, G Aryal, S Thapa, S Khakurel, K Shrestha
BACKGROUND: Chronic kidney disease (CKD) is a global burden and now recognized as a major public health problem worldwide. Patients with CKD have alteration in thyroid hormone metabolism. This study aims to evaluate the status of thyroid hormone profile in different stages of CKD. METHODS: The cross-sectional study included 103 CKD patients attending Nephrology and Dialysis unit of KIST Medical College Teaching Hospital, Lalitpur, Nepal. Serum creatinine, free triiodothyronine (fT3), free thyroxine (fT4), and thyroid stimulating hormone (TSH) were measured...
September 2016: Journal of Nepal Health Research Council
https://www.readbyqxmd.com/read/28327186/clinical-behavioural-and-pharmacogenomic-factors-influencing-the-response-to-levothyroxine-therapy-in-patients-with-primary-hypothyroidism-protocol-for-a-systematic-review
#7
Rosie Dew, Onyebuchi Okosieme, Colin Dayan, Vinay Eligar, Ishrat Khan, Salman Razvi, Simon Pearce, Scott Wilkes
BACKGROUND: Suboptimal thyroid hormone therapy including under-replacement and over-replacement is common amongst patients with hypothyroidism. This is a significant health concern as affected patients are at risk of adverse cardiovascular or metabolic consequences. Despite a growing body of evidence on the effects of various factors on thyroid hormone replacement, a systematic appraisal of the evidence is lacking. This review aims to appraise and quantify the extent to which clinical, behavioural and pharmacogenomic factors affect levothyroxine therapy in patients with primary hypothyroidism...
March 21, 2017: Systematic Reviews
https://www.readbyqxmd.com/read/28324012/deletion-of-the-thyroid-hormone-activating-type-2-deiodinase-rescues-cone-photoreceptor-degeneration-but-not-deafness-in-mice-lacking-type-3-deiodinase
#8
Lily Ng, Hong Liu, Donald L St Germain, Arturo Hernandez, Douglas Forrest
Type 2 deiodinase amplifies and type 3 deiodinase depletes levels of the active form of thyroid hormone, triiodothyronine (T3). Given the opposing activities of these enzymes, we tested the hypothesis that they counteract each other's developmental functions by investigating whether deletion of type 2 deiodinase (encoded by Dio2) modifies sensory phenotypes in type 3 deiodinase-deficient (Dio3-/-) mice. Dio3-/- mice display degeneration of retinal cones, the photoreceptors that mediate daylight and color vision...
March 7, 2017: Endocrinology
https://www.readbyqxmd.com/read/28323940/thyroid-signaling-insulin-resistance-and-type-2-diabetes-mellitus-a-mendelian-randomization-study
#9
Maxime M Bos, Roelof Aj Smit, Stella Trompet, Diana van Heemst, Raymond Noordam
CONTEXT: Increasing evidence suggests an association between thyroid stimulating hormone (TSH), free thyroxine (fT4) and deiodinases with insulin resistance and type 2 diabetes mellitus (T2D). OBJECTIVE: We examined whether TSH and fT4 levels and deiodinases are causally associated with insulin resistance and T2D using Mendelian randomization (MR). METHODS: We selected twenty genetic variants for TSH level and four for fT4 level (identified in a GWAS meta-analysis of European-ancestry cohorts) as instrumental variables for TSH and fT4 level, respectively...
March 9, 2017: Journal of Clinical Endocrinology and Metabolism
https://www.readbyqxmd.com/read/28322991/thyroid-hormone-induce-a-p53-dependent-dna-damage-through-pi3k-akt-activation-in-sperm
#10
Hong Xian, Fang Wang, Wending Teng, Dong Yang, Ming Zhang
Accumulating evidences showed that thyroid hormone was participated in the functioning of the reproductive system, and an elevated level of thyroid hormones had a negative impact on reproductive system. However, the molecular basis for this observation still remains to be fully understood. Here, we show that l-Thyroxine significantly impaired human sperm motility. The molecular basis showed that thyroxine receptor stimulation triggers Phosphatidyl Inositol 3-kinase (PI3K)/Akt signaling activation leading to the E3 ligase MDM2 phosphorylation at serine 166, which directly interacted with p53 for degradation...
March 16, 2017: Gene
https://www.readbyqxmd.com/read/28322754/evaluation-of-the-clsi-ep26-a-protocol-for-detection-of-reagent-lot-to-lot-differences
#11
Brooke M Katzman, Karl M Ness, Alicia Algeciras-Schimnich
BACKGROUND: Verification of new reagent lots is a required laboratory task. The Clinical and Laboratory Standards Institute (CLSI) EP26-A guideline provides a lot-to-lot verification protocol to detect significant changes in test performance. The aim of this study was to compare the performance of EP26-A with our laboratory reagent lot verification protocol. METHODS: Prospective evaluations for two reagent lots each for thyroid stimulating hormone (TSH), thyroglobulin (Tg), thyroxine (T4), triiodothyronine (T3), free triiodothyronine (fT3), and thyroid peroxidase antibody (TPOAb) were performed...
March 17, 2017: Clinical Biochemistry
https://www.readbyqxmd.com/read/28322267/exposure-of-pregnant-mice-to-triclosan-impairs-placental-development-and-nutrient-transport
#12
Xinyuan Cao, Xu Hua, Xiaoli Wang, Ling Chen
Triclosan (TCS) is associated with spontaneous abortions and fetal growth restriction. Here, we showed that when pregnant mice were treated with 8 mg/kg TCS (8-TCS mice) on gestational days (GD) 6-18 fetal body weights were lower than controls. Placental weights and volumes were reduced in 8-TCS mice. The placental proliferative cells and expression of PCNA and Cyclin D3 on GD13 were remarkably decreased in 8-TCS mice. The decreases in activities and expression of placental System A amino acid or glucose transporters on GD14 and GD17 were observed in 8-TCS mice...
March 21, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28315587/the-effect-of-l-thyroxine-treatment-on-sexual-function-and-depressive-symptoms-in-men-with-autoimmune-hypothyroidism
#13
Robert Krysiak, Witold Szkróbka, Bogusław Okopień
BACKGROUND: Thyroid autoimmunity and mild hypothyroidism in women seem to be associated with sexual dysfunction and depressive symptoms. Data concerning similar associations in men are limited. The aim of this study was to investigate sexual functioning and depressive symptoms in men with autoimmune hypothyroidism. METHODS: The study population consisted of three groups: men with autoimmune overt hypothyroidism (group A), men with autoimmune subclinical hypothyroidism (group B) and healthy euthyroid males without thyroid autoimmunity (group C)...
January 17, 2017: Pharmacological Reports: PR
https://www.readbyqxmd.com/read/28306523/evaluation-of-thyroid-test-utilization-through-analysis-of-population-level-data
#14
Jasmine Gill, Vilte E Barakauskas, Dylan Thomas, Karina Rodriguez-Capote, Trefor Higgins, Don Zhang, Amanda VanSpronsen, Oksana Babenko, Roberta Martindale, Mathew P Estey
BACKGROUND: Inappropriate laboratory test utilization can result in unnecessary patient testing and increased healthcare costs. While several thyroid function tests are available, thyroid-stimulating hormone (TSH) is recommended as the first-line test for investigating and monitoring thyroid dysfunction. We evaluate thyroid test utilization in Northern Alberta in terms of testing patterns, frequencies, and reflex cutpoints. METHODS: This retrospective study analyzed thyroid test requests from January to December 2014...
March 15, 2017: Clinical Chemistry and Laboratory Medicine: CCLM
https://www.readbyqxmd.com/read/28303741/weight-of-the-evidence-evaluation-of-2-4-d-potential-for-interactions-with-the-estrogen-androgen-and-thyroid-pathways-and-steroidogenesis
#15
B H Neal, J Bus, M S Marty, K Coady, A Williams, J Staveley, J C Lamb
A comprehensive weight-of-the-evidence evaluation of 2,4-dichlorophenoxyacetic acid (2,4-D) was conducted for potential interactions with the estrogen, androgen and thyroid pathways and with steroidogenesis. This assessment was based on an extensive database of high quality in vitro, in vivo ecotoxicological and in vivo mammalian toxicological studies. Epidemiological studies were also considered. Toxicokinetic data provided the basis for determining rational cutoffs above which exposures were considered irrelevant to humans based on exceeding thresholds for saturation of renal clearance (TSRC); extensive human exposure and biomonitoring data support that these boundaries far exceed human exposures and provide ample margins of exposure...
March 2, 2017: Critical Reviews in Toxicology
https://www.readbyqxmd.com/read/28302175/prolonged-hypothyroidism-severely-reduces-ovarian-follicular-reserve-in-adult-rats
#16
Li Meng, Eddy Rijntjes, Hans J M Swarts, Jaap Keijer, Katja J Teerds
BACKGROUND: There is substantial evidence both in humans and in animals that a prolonged reduction in plasma thyroid hormone concentration leads to reproductive problems, including disturbed folliculogenesis, impaired ovulation and fertilization rates, miscarriage and pregnancy complications. The objective of the present study is to examine the consequences of chronic hypothyroidism, induced in adulthood, for the size of the ovarian follicle pool. In order to investigate this, adult female rats were provided either a control or an iodide deficient diet in combination with perchlorate supplementation to inhibit iodide uptake by the thyroid...
March 16, 2017: Journal of Ovarian Research
https://www.readbyqxmd.com/read/28301073/thyroid-function-in-end-stage-renal-disease-and-effects-of-frequent-hemodialysis
#17
Joan C Lo, Gerald J Beck, George A Kaysen, Christopher T Chan, Alan S Kliger, Michael V Rocco, Minwei Li, Glenn M Chertow
INTRODUCTION: End-stage renal disease (ESRD) is associated with perturbations in thyroid hormone concentrations and an increased prevalence of hypothyroidism. Few studies have examined the effects of hemodialysis dose or frequency on endogenous thyroid function. METHODS: Within the Frequent Hemodialysis Network (FHN) trials, we examined the prevalence of hypothyroidism in patients with ESRD. Among those with endogenous thyroid function (without overt hyper/hypothyroidism or thyroid hormone supplementation), we examined the association of thyroid hormone concentration with multiple parameters of self-reported health status, and physical and cognitive performance, and the effects of hemodialysis frequency on serum thyroid stimulating hormone (TSH), free thyroxine (FT4), and free tri-iodothyronine (FT3) levels...
March 16, 2017: Hemodialysis International
https://www.readbyqxmd.com/read/28300464/serum-visfatin-vascular-endothelial-growth-factor-and-matrix-metalloproteinase-9-in-women-with-polycystic-ovary-syndrome
#18
Kalliopi Dambala, Dimitrios Vavilis, Eleni Bili, Dimitrios G Goulis, Basil C Tarlatzis
AIM: To evaluate serum concentrations of visfatin, vascular endothelial growth factor (VEGF) and matrix metalloproteinase-9 (MMP-9) in women with polycystic ovary syndrome (PCOS) and to investigate their possible role as early endothelial markers in PCOS. METHODS: Forty-two women with PCOS and 42 controls, matched for age and weight, were included in the study. Serum concentrations of follicle-stimulating hormone (FSH), luteinizing hormone (LH), prolactin, total testosterone (tT), Δ4-androstenedione (Δ4A), dehydroepinadrosterone sulphate (DHEA-S), 17-OH-progesterone, sex hormone-binding protein (SHBG), thyroid-stimulating hormone (TSH), free thyroxine (fT4), visfatin, VEGF and MMP-9 were measured in all women; free androgen index (FAI) was calculated as well...
March 16, 2017: Gynecological Endocrinology
https://www.readbyqxmd.com/read/28295871/promoting-resource-stewardship-reducing-inappropriate-free-thyroid-hormone-testing
#19
Julie A Gilmour, Alanna Weisman, Steven Orlov, Robert J Goldberg, Alyse Goldberg, Hayley Baranek, Geetha Mukerji
RATIONALE: Free thyroxine (fT4) and free triiodothyronine (fT3) tests are often ordered when not clinically warranted. Preventing laboratory overuse by reducing inappropriate fT4 and fT3 testing is one strategy to promote resource stewardship. OBJECTIVES: (1) To characterize the frequency of inappropriate fT4 and fT3 testing and (2) to implement a quality improvement strategy aimed at reducing the number of these tests performed. METHODS: Quality improvement tools were used to create sequential change ideas: (1) education of physicians regarding appropriate indications for ordering fT4/fT3 and (2) implementation of a hospital-wide laboratory and forced-function system with a reflex fT4...
March 14, 2017: Journal of Evaluation in Clinical Practice
https://www.readbyqxmd.com/read/28293260/treatment-with-myo-inositol-and-selenium-ensures-euthyroidism-in-patients-with-autoimmune-thyroiditis
#20
Maurizio Nordio, Sabrina Basciani
Clinical evidences have highlighted the efficacy of myo-inositol and selenium in the treatment of autoimmune thyroiditis. Aim of this study was to further analyze the role of myo-inositol plus selenium (Myo-Ins-Se) in restoring a normal thyroid function of Hashimoto's patients with subclinical hypothyroidism. Eighty-six patients with Hashimoto's thyroiditis having thyroid-stimulating hormone (TSH) levels between 3 and 6 mIU/L, elevated serum antithyroid peroxidase (TPOAb) and/or antithyroglobulin (TgAb), and normal free thyroxine (fT4) and free triiodothyronine (fT3) levels were enrolled in the study: one hyperthyroid subject with TSH about 0...
2017: International Journal of Endocrinology
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