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    2760 results match your criteria Toxicity Thyroid Hormone

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    Melatonin as pleiotropic molecule with therapeutic potential for type 2 diabetes and cancer.
    Curr Med Chem 2017 Jul 18. Epub 2017 Jul 18.
    Department of Structural Biology, Faculty of Biomedical Sciences and Postgraduate Education, Medical University of Lodz, Lodz. Poland.
    The incidence both of diabetes, particularly type 2 (T2DM), and cancer is increasing worldwide, making these diseases growing global health problem along with increasing healthcare expenditures. The current therapeutic approach for the treatment of these multifactorial diseases is far from satisfactory. Therefore, there is still considerable interest in searching new therapeutic strategies with the use of both natural and synthetic compounds exhibiting higher efficiency and lower toxicity compared to medicines used currently in clinical practice. Read More

    Prenatal transfer of decabromodiphenyl ether (BDE-209) results in disruption of the thyroid system and developmental toxicity in zebrafish offspring.
    Aquat Toxicol 2017 Jun 23;190:46-52. Epub 2017 Jun 23.
    State Key Laboratory of Pollution Control and Resource Reuse and School of the Environment, Nanjing University, Nanjing, Jiangsu 210093, China. Electronic address:
    Decabromodiphenyl ether (BDE-209) was one of most widely-used polybrominated diphenyl ether (PBDE) flame retardants and is frequently detected in both abiotic and biotic samples from environment. However, knowledge of its transgenerational risks is limited. Here, 4-month-old zebrafish were exposed to various concentrations of BDE-209 (0, 3, 30 or 300μg/L) for 28days and spawned in clean water without BDE-209. Read More

    A multi-tiered, in vivo, quantitative assay suite for environmental disruptors of thyroid hormone signaling.
    Aquat Toxicol 2017 Jun 21;190:1-10. Epub 2017 Jun 21.
    Department of Neurobiology, Physiology, and Behavior, College of Biological Sciences, University of California, Davis 95616-8519, USA. Electronic address:
    The essential role of thyroid hormone (TH) signaling in mammalian development warrants the examination of man-made chemicals for its disruption. Among vertebrate species, the molecular components of TH signaling are highly conserved, including the thyroid hormone receptors (TRs), their heterodimer binding partners the retinoid-X receptors (RXRs), and their DNA recognition sequences (TREs). This molecular conservation allows examination of potential TH disruption in the tractable, in vivo model system of amphibian metamorphosis. Read More

    Image analysis for TSH mRNA in situ hybridization in pituitary glands from rats with thyroid follicular cell hypertrophy after treatment with three different test compounds.
    Res Vet Sci 2017 Jun 11;114:313-321. Epub 2017 Jun 11.
    Roche Pharmaceutical Research & Early Development, Pharmaceutical Sciences, Roche Innovation Center Basel, Switzerland.
    The goal of this in situ hybridization and image analysis technique is to study the effects of new pharmacological/chemical entities on the thyroid and pituitary gland in rats, reveal the pathogenesis of thyroid follicular cell hypertrophy and to retrospectively exclude the risk of thyroid tumor development in humans. In the present study, we describe the increase of thyroid-stimulating hormone- (TSH-) beta subunit mRNA in the pars distalis of the pituitary gland and the quantitative measurement of TSH mRNA positive cells from rats of three 4-week toxicity studies treated with three different test compounds inducing thyroid follicular cell and hepatocellular hypertrophy in rats. Compared to immunohistochemistry (IHC), in situ hybridization (ISH) for TSH was found to be more sensitive. Read More

    The cell biology of the thyroid-disrupting mechanism of dichlorodiphenyltrichloroethane (DDT).
    J Endocrinol Invest 2017 Jun 21. Epub 2017 Jun 21.
    Department of Translational Research and New Technologies in Medicine and Surgery, University of Pisa, Pisa, Italy.
    Objective: Dichlorodiphenyltrichloroethane (DDT) is an organochlorine known for its pesticide properties and for its negative effects on human health. It was banned in most countries for its toxicity to the endocrine system, but due to its persistence at clinically relevant concentrations in both soil and animal tissues, DDT is still linked to several health and social problems.

    Methods: We have previously shown that DDT exposure is causally related to the extracellular release of vesicular organelles such as microvesicles and/or exosomes by using immunocytochemistry with gold-tagged antibodies and various fluorescent membrane markers. Read More

    Time-dependent inhibitory effects of Tris(1, 3-dichloro-2-propyl) phosphate on growth and transcription of genes involved in the GH/IGF axis, but not the HPT axis, in female zebrafish.
    Environ Pollut 2017 Jun 15;229:470-478. Epub 2017 Jun 15.
    College of Fisheries, Huazhong Agricultural University, Wuhan 430070, China; Collbaorative Innovation Center for Efficient and Health Production of Fisheries in Hunan Province, Hunan, Changde 415000, China. Electronic address:
    Growth curves were used to determine sensitive exposure windows for evaluation of developmental toxicity of chemicals to zebrafish. Dose- and time-dependent effects on body mass, body length and expression of genes involved in the growth hormone/insulin-like growth factor (GH/IGF) axis and the hypothalamic-pituitary-thyroid (HPT) axis were examined after exposure to environmentally relevant concentrations of tris(1,3-dichloro-2-propyl) phosphate (TDCIPP). Based on growth curves, zebrafish grew most rapidly between 60 and 90 days post fertilization (dpf). Read More

    Endocrine-disrupting activity of per- and polyfluoroalkyl substances: Exploring combined approaches of ligand and structure based modeling.
    Chemosphere 2017 Jun 9;184:514-523. Epub 2017 Jun 9.
    Interdisciplinary Center for Nanotoxicity, Department of Chemistry and Biochemistry, Jackson State University, Jackson, MS, 39217, USA. Electronic address:
    Exposure to perfluorinated and polyfluoroalkyl substances (PFCs/PFASs), endocrine disrupting halogenated pollutants, has been linked to various diseases including thyroid toxicity in human populations across the globe. PFASs can compete with thyroxine (T4) for binding to the human thyroid hormone transport protein transthyretin (TTR) which may lead to reduce thyroid hormone levels leading to endocrine disrupting adverse effects. Environmental fate and endocrine-disrupting activity of PFASs has initiated several research projects, but the amount of experimental data available for these pollutants is limited. Read More

    Endemic goitre and hypothyroidism in an adult female patient dependent on total parenteral nutrition.
    Endocrinol Diabetes Metab Case Rep 2017 7;2017. Epub 2017 Jun 7.
    Departments of Endocrinology.
    We present the case of a thirty-year-old female patient who was referred to the endocrinology team with an enlarging goitre and biochemical hypothyroidism. She had been dependent on total parenteral nutrition for the previous six years as a result of intestinal failure thought to be caused by possible underlying mitochondrial disease. The patient also suffers from a Desmin myopathy, and at present, the exact aetiology behind her intestinal failure is not certain. Read More

    Effects of chronic exposure to triclosan on reproductive and thyroid endpoints in the adult Wistar female rat.
    J Toxicol Environ Health A 2017 1;80(4):236-249. Epub 2017 Jun 1.
    a Endocrine Toxicology Branch, Toxicity Assessment Division , National Health and Environmental Effects Research Laboratory, Office of Research and Development, U.S. EPA , Research Triangle Park , NC , USA.
    Triclosan (TCS), an antibacterial, has been shown to be an endocrine disruptor in the rat. Previously, subchronic TCS treatment to female rats was found to advance puberty and potentiate the effect of ethinyl estradiol (EE) on uterine growth when EE and TCS were co-administered prior to weaning. In the pubertal study, a decrease in serum thyroxine (T4) concentrations with no significant change in serum thyroid-stimulating hormone (TSH) was also observed. Read More

    Contaminants and energy expenditure in an Arctic seabird: Organochlorine pesticides and perfluoroalkyl substances are associated with metabolic rate in a contrasted manner.
    Environ Res 2017 Aug 26;157:118-126. Epub 2017 May 26.
    Norwegian Polar Research Institute, Fram Centre, NO-9296 Tromsø, Norway.
    Basal metabolic rate (BMR), the minimal energetic cost of living in endotherms, is known to be influenced by thyroid hormones (THs) which are known to stimulate in vitro oxygen consumption of tissues in birds and mammals. Several environmental contaminants may act on energy expenditure through their thyroid hormone-disrupting properties. However, the effect of contaminants on BMR is still poorly documented for wildlife. Read More

    Effects of unintentional PCBs in pigments and chemical products on transcriptional activity via aryl hydrocarbon and nuclear hormone receptors.
    Environ Pollut 2017 Aug 10;227:306-313. Epub 2017 May 10.
    Hokkaido Institute of Public Health, Kita-19, Nishi-12, Kita-ku, Sapporo 060-0819, Japan.
    In recent years, some pigments and chemical products have been reported to contain polychlorinated biphenyl (PCB) congeners as unintentional byproducts, and these have also been detected in residential environments from indoor air and house dust. In this study, using in vitro reporter gene assays, we characterized the agonistic and antagonistic activities of a total of 25 PCB congeners contained in pigments (PCB-1 to -16, -20, -35, -40, -52, -56, -77, -101, -126, and -153) against five nuclear hormone receptors, (estrogen receptor (ER) α/β, glucocorticoid receptor (GR), androgen receptor (AR), thyroid hormone receptor (TR) α1) and aryl hydrocarbon receptor (AhR). In the ERα/β assays, 19 and 13 of the 25 PCBs tested showed ERα/β agonistic and/or antagonistic activities, respectively. Read More

    Alternative plasticizer, 4-cyclohexene-1,2-dicarboxylic acid dinonyl ester, for blood containers with protective effects on red blood cells and improved cold resistance.
    J Biomed Mater Res B Appl Biomater 2017 May 13. Epub 2017 May 13.
    Division of Medical Devices, National Institute of Health Sciences, Tokyo, 158-8501, Japan.
    Di (2-ethylhexyl) phthalate (DEHP), a typical plasticizer used for polyvinyl chloride (PVC), is eluted from PVC-made blood containers and protects against red blood cell (RBC) hemolysis. However, concerns have arisen regarding the reproductive and developmental risks of DEHP in humans, and the use of alternative plasticizers for medical devices has been recommended worldwide. In this study, we propose that the use of a novel plasticizer, 4-cyclohexene-1,2-dicarboxylic acid dinonyl ester (DL9TH), could help produce more useful and safe blood containers. Read More

    Impaired swim bladder inflation in early life stage fathead minnows exposed to a deiodinase inhibitor, iopanoic acid.
    Environ Toxicol Chem 2017 May 10. Epub 2017 May 10.
    Mid-Continent Ecology Division, US Environmental Protection Agency, Duluth, Minnesota, USA.
    Inflation of the posterior and/or anterior swim bladder is a process previously demonstrated to be regulated by thyroid hormones. We investigated whether inhibition of deiodinases, which convert thyroxine (T4) to the more biologically active form, 3,5,3'-triiodothyronine (T3), would impact swim bladder inflation. Two experiments were conducted using a model deiodinase inhibitor, iopanoic acid (IOP). Read More

    Activated thyroid hormone receptor modulates dioxin-inducible aryl hydrocarbon receptor-mediated CYP1A1 induction in human hepatocytes but not in human hepatocarcinoma HepG2 cells.
    Toxicol Lett 2017 Jun 3;275:77-82. Epub 2017 May 3.
    Department of Cell Biology and Genetics, Faculty of Science, Palacky University in Olomouc, Slechtitelu 27, Olomouc, CZ-783 71, Czech Republic.
    Aryl hydrocarbon receptor (AhR) is a transcription factor, the activity of which is modulated by hormones including glucocorticoids and estrogens. In this study, we examined the effects of triiodothyronine (T3), a ligand and activator of thyroid hormone receptor (TR), on transcriptional activity of AhR and the expression of its target gene CYP1A1. Study was carried out in human hepatocellular carcinoma cells HepG2 and primary cultures of human hepatocytes (HH). Read More

    Deficiency in the manganese efflux transporter SLC30A10 induces severe hypothyroidism in mice.
    J Biol Chem 2017 Jun 1;292(23):9760-9773. Epub 2017 May 1.
    From the Division of Pharmacology & Toxicology, College of Pharmacy, Institute for Cellular & Molecular Biology, and Institute for Neuroscience and
    Manganese is an essential metal that becomes toxic at elevated levels. Loss-of-function mutations in SLC30A10, a cell-surface-localized manganese efflux transporter, cause a heritable manganese metabolism disorder resulting in elevated manganese levels and parkinsonian-like movement deficits. The underlying disease mechanisms are unclear; therefore, treatment is challenging. Read More

    Perfluoroalkyl substances exposure and thyroid hormones in humans: epidemiological observations and implications.
    Ann Pediatr Endocrinol Metab 2017 Mar 31;22(1):6-14. Epub 2017 Mar 31.
    School of Public Health, Seoul National University, Seoul, Korea.
    Thyroid hormones play crucial roles in normal neurodevelopment of fetus and child. Many chemicals can affect control and homeostasis of thyroid hormones, and eventually lead to various adverse health effects including neurodevelopmental disorders. Perfluoroalkyl substances (PFASs) are among the thyroid disrupting chemicals that can be encountered among general human population. Read More

    Use of short interfering RNA delivered by cationic liposomes to enable efficient down-regulation of PTPN22 gene in human T lymphocytes.
    PLoS One 2017 24;12(4):e0175784. Epub 2017 Apr 24.
    Type 1 Diabetes Centre, Infectivology and Clinical Trials Area, Children's Hospital Bambino Gesù, Rome, Italy.
    Type 1 diabetes and thyroid disease are T cell-dependent autoimmune endocrinopathies. The standard substitutive administration of the deficient hormones does not halt the autoimmune process; therefore, development of immunotherapies aiming to preserve the residual hormonal cells, is of crucial importance. PTPN22 C1858T mutation encoding for the R620W lymphoid tyrosine phosphatase variant, plays a potential pathophysiological role in autoimmunity. Read More

    Thyroid disrupting pesticides impair the hypothalamic-pituitary-testicular axis of a wildlife bird, Amandava amandava.
    Reprod Toxicol 2017 Aug 19;71:32-41. Epub 2017 Apr 19.
    Department of Biology, University of Waseda, Tokyo, Japan.
    The effect of two thyroid disrupting pesticides (TDPs) mancozeb (MCZ) and imidacloprid (IMI) on the hypothalamic-pituitary-gonadal/testicular (HPG) axis of a seasonally breeding bird, Amandava amandava has been evaluated. Male birds (n=8/group) were exposed to each of the pesticide (0.25% LD50 of respective pesticide) as well as to their two equimixture doses (0. Read More

    Congener-Specific Disposition of Chiral Polychlorinated Biphenyls in Lactating Mice and Their Offspring: Implications for PCB Developmental Neurotoxicity.
    Toxicol Sci 2017 Apr 14. Epub 2017 Apr 14.
    current affiliation: Health Research Institute Laboratories, Fairfield, Iowa. USA.
    Chiral polychlorinated biphenyl (PCB) congeners have been implicated by laboratory and epidemiological studies in PCB developmental neurotoxicity. These congeners are metabolized by cytochrome P450 (P450) enzymes to potentially neurotoxic hydroxylated metabolites (OH-PCBs). The present study explores the enantioselective disposition and toxicity of two environmentally relevant, neurotoxic PCB congeners and their OH-PCB metabolites in lactating mice and their offspring following dietary exposure of the dam. Read More

    Iodine-131-meta-iodobenzylguanidine therapy for patients with newly diagnosed high-risk neuroblastoma.
    Cochrane Database Syst Rev 2017 Apr 21;4:CD010349. Epub 2017 Apr 21.
    Nuclear Medicine, Academic Medical Center, P.O Box 9, Amsterdam, Netherlands, 2200 DD.
    Background: Patients with newly diagnosed high-risk (HR) neuroblastoma (NBL) still have a poor outcome, despite multi-modality intensive therapy. This poor outcome necessitates the search for new therapies, such as treatment with (131)I-meta-iodobenzylguanidine ((131)I-MIBG).

    Objectives: To assess the efficacy and adverse effects of (131)I-MIBG therapy in patients with newly diagnosed HR NBL. Read More

    Clinical Toxicity of Acute Overdoses With L-Thyroxin in Children.
    Pediatr Emerg Care 2017 Apr 18. Epub 2017 Apr 18.
    From the *Department of Pediatrics, Kayseri Training and Research Hospital, Kayseri; and †Department of Pediatric Endocrinology, Dr Sami Ulus Children Training and Research Hospital, Ankara, Turkey.
    Objectives: L-Thyroxine ingestion is rarely seen in children; here, we report our experience of it. This study describes the clinical characteristics and laboratory findings of acute L-thyroxine ingestion in children.

    Methods: This retrospective study enrolled patients treated for L-thyroxine ingestion at Kayseri Teaching Hospital between September 2013 and September 2016. Read More

    Histological changes, lipid metabolism and oxidative stress in the liver of Bufo gargarizans exposed to cadmium concentrations.
    Chemosphere 2017 Jul 31;179:337-346. Epub 2017 Mar 31.
    College of Life Science, Shaanxi Normal University, Xi'an 710119, China. Electronic address:
    Chinese toad (Bufo gargarizans) were exposed to different concentrations of cadmium (5, 50, 100, 200 and 500 μg Cd L(-1)) from Gosner stage 3-42. Metamorphosis rate, body weight, total length and body length were measured. Histological alterations in thyroid gland and liver were examined. Read More

    Cytophysiological Changes in the Follicular Epithelium of the Thyroid Gland after Long-Term Exposure to Low Doses of Dichlorodiphenyltrichloroethane (DDT).
    Bull Exp Biol Med 2017 Mar 30;162(5):699-702. Epub 2017 Mar 30.
    Research Institute of Human Morphology, Moscow, Russia.
    Exposure to endocrine disruptors is considered as a risk factor thyroid gland diseases. We analyzed cytophysiological changes in rat thyroid follicular epithelium after long-term exposure to low doses of the most widespread disruptor DDT. Analysis of thyroid hormone production and light and electron microscopy of thyroid gland samples revealed cytophysiological changes in thyroid epithelium related to impaired transport through the apical membrane, suppressed Golgi complex activity, and impaired thyrotrophic hormone regulation of the secretory functions of thyroid cells, which led to compensatory transition from merocrine to microapocrine secret release. Read More

    Local delivery of thyroid hormone enhances oligodendrogenesis and myelination after spinal cord injury.
    J Neural Eng 2017 Jun 30;14(3):036014. Epub 2017 Mar 30.
    School of Biomedical Engineering, Science and Health Systems, Drexel University, 3141 Chestnut Street, Philadelphia, PA 19104, United States of America.
    Objective: Traumatic spinal cord injury (SCI) causes apoptosis of myelin-forming oligodendrocytes (OLs) and demyelination of surviving axons, resulting in conduction failure. Remyelination of surviving denuded axons provides a promising therapeutic target for spinal cord repair. While cell transplantation has demonstrated efficacy in promoting remyelination and functional recovery, the lack of ideal cell sources presents a major obstacle to clinical application. Read More

    Recognizing and managing on toxicities in cancer immunotherapy.
    Tumour Biol 2017 Mar;39(3):1010428317694542
    Department of Cancer Biotherapy Center, Hubei Cancer Hospital, Wuhan, China.
    Over the past 4 years, cancer immunotherapy has significantly prolonged survival time of patients with prostate cancer, melanoma, lung cancer, and liver cancer, but its side effects are also impressive. Different types of the immune therapeutic agents have different on-target or off-target toxicity due to high affinity or weak specificity, respectively. Treatment toxicity spectrums vary greatly even in patients with the same type of cancer. Read More

    Impact of body mass index on survival outcome in patients with differentiated thyroid cancer.
    Braz J Otorhinolaryngol 2017 Feb 28. Epub 2017 Feb 28.
    King Saud University, College of Medicine, Department of Otolaryngology-Head & Neck Surgery, Riyadh, Saudi Arabia. Electronic address:
    Introduction: Increased body mass index (BMI) is known to be associated with the high prevalence of Differentiated Thyroid Cancers (DTC); however data on its impact on survival outcome after thyroidectomy and adjuvant therapy is scanty.

    Objective: We aimed to evaluate the impact of BMI on overall survival (OS) and disease free survival (DFS) rates in patients with DTC.

    Methods: Between 2000 and 2011, 209 patients with DTC (papillary, follicular, hurthle cell) were treated with thyroidectomy followed by adjuvant radioactive iodine-131 (RAI) therapy and thyroid-stimulating hormone (TSH) suppression. Read More

    Safety and tolerability of a dried aqueous spearmint extract.
    Regul Toxicol Pharmacol 2017 Jun 7;86:167-176. Epub 2017 Mar 7.
    Kemin Foods, L.C., 2100 Maury St., Des Moines, IA 50317, USA.
    Spearmint (Mentha spicata L.) and spearmint extracts are Generally Recognized as Safe (GRAS) for use as flavoring in beverages, pharmaceuticals, and confectionaries. Studies of spearmint extracts in humans and animals have reported conflicting results with respect to toxicity. Read More

    Endocrine disruption, oxidative stress, and testicular damage induced by 4-nonylphenol in Clarias gariepinus: the protective role of Cydonia oblonga.
    Fish Physiol Biochem 2017 Aug 11;43(4):1095-1104. Epub 2017 Mar 11.
    Laboratory of Fish Reproduction, Aquaculture Division, National Institute of Oceanography Fisheries, Alexandria, 21556, Egypt.
    Exposure to xenoestrogens like 4-nonylphenol (NP) is recognized by disrupting endocrine functions and causes reproductive dysfunction in male fish. The present study aimed at investigating the 4-nonylphenol propensity to induce oxidative stress and hormonal disturbances in male catfish and at studying the protective role of quince (Cydonia oblonga). To fulfill this aim, catfish Clarias gariepinus were exposed to pure 100 μg/L 4-NP and to quince the leaf extract added to 4-NP, both for 15 days. Read More

    Maternal carbamazepine alters fetal neuroendocrine-cytokines axis.
    Toxicology 2017 May 3;382:59-66. Epub 2017 Mar 3.
    Division of Anatomy and Embryology, Zoology Department, Faculty of Science, Cairo University, Egypt.
    This study detected the impact of maternal carbamazepine (CBZ) on the fetal neuroendocrine-cytokines axis. 25 or 50mg/kg of CBZ was intraperitoneally administrated to pregnant albino rats from the gestation day (GD) 1 to 20. Both administrations of CBZ caused a hypothyroidism in dams and fetuses whereas the decreases in serum thyroxine (T4) and triiodothyronine (T3) and increases in serum thyrotropin (TSH) levels were highly significant (LSD; P <0. Read More

    Evaluation of the risk of perchlorate exposure in a population of late-gestation pregnant women in the United States: Application of probabilistic biologically-based dose response modeling.
    Toxicol Appl Pharmacol 2017 May 2;322:9-14. Epub 2017 Mar 2.
    Division of Bioinformatics and Biostatistics, National Center for Toxicological Research, U.S. Food and Drug Administration, 3900 NCTR Rd, HFT-20, Jefferson, AR 72079, USA. Electronic address:
    The risk of ubiquitous perchlorate exposure and the dose-response on thyroid hormone levels in pregnant women in the United States (U.S.) have yet to be characterized. Read More

    Semicarbazide-induced thyroid disruption in Japanese flounder (Paralichthys olivaceus) and its potential mechanisms.
    Ecotoxicol Environ Saf 2017 Jun 28;140:131-140. Epub 2017 Feb 28.
    Marine Life Science College, Ocean University of China, Qingdao 266003, China. Electronic address:
    Semicarbazide (SMC) is a carcinogenic and genotoxic substance that has been found in aquatic systems. SMC may also cause thyroid follicular epithelial cell injury in rats, but the thyroid-disrupting properties of SMC and its potential mechanisms remain unclear. In this study, we exposed fertilized eggs of Japanese flounder (Paralichthys olivaceus) to 1, 10, 100, and 1000μg/L SMC for 55 d to assess the impact of SMC exposure on the thyroid system. Read More

    Adverse effects of BDE-47 on in vivo developmental parameters, thyroid hormones, and expression of hypothalamus-pituitary-thyroid (HPT) axis genes in larvae of the self-fertilizing fish Kryptolebias marmoratus.
    Chemosphere 2017 Jun 20;176:39-46. Epub 2017 Feb 20.
    Department of Biological Science, College of Science, Sungkyunkwan University, Suwon 16419, South Korea. Electronic address:
    2,2',4,4'-tetrabromodiphenylether (BDE-47) is known to have the potential to disrupt the thyroid endocrine system in fishes due to its structural similarity to the thyroid hormones triiodothyronine (T3) and thyroxine (T4). However, the effects of BDE-47 on thyroid function in fishes remain unclear. In this study, abnormal development (e. Read More

    Re-evaluation of thyroid hormone signaling antagonism of tetrabromobisphenol A for validating the T3-induced Xenopus metamorphosis assay.
    J Environ Sci (China) 2017 Feb 24;52:325-332. Epub 2016 Nov 24.
    College of Environment, Nanjing University of Technology, Nanjing 211816, China. Electronic address:
    We developed the T3-induced Xenopus metamorphosis assay, which is supposed to be able to sensitively detect thyroid hormone (TH) signaling disruption of chemicals. The present study aimed to validate the T3-induced Xenopus metamorphosis assay by re-evaluating the TH signaling antagonism of tetrabromobisphenol A (TBBPA), a known TH signaling disruptor. According to the assay we developed, Xenopus tadpoles at stage 52 were exposed to 10-500nmol/L TBBPA in the presence of 1nmol/L T3. Read More

    Optimization of the T3-induced Xenopus metamorphosis assay for detecting thyroid hormone signaling disruption of chemicals.
    J Environ Sci (China) 2017 Feb 23;52:314-324. Epub 2016 Nov 23.
    School of Environment and Resource, Southwest University of Science and Technology, Mianyang 621010, China. Electronic address:
    T3-induced Xenopus metamorphosis is an ideal model for detecting thyroid hormone (TH) signaling disruption of chemicals. To optimize the T3-induced Xenopus assay and improve its sensitivity and reproducibility, we intend to develop quantitatively morphological endpoints and choose appropriate concentrations and exposure durations for T3 induction. Xenopus laevis at stage 52 were exposed to series of concentrations of T3 (0. Read More

    Disruption of the hypothalamic-pituitary-thyroid axis on co-exposures to dithiocarbamate and neonicotinoid pesticides: Study in a wildlife bird, Amandava amandava.
    Neurotoxicology 2017 May 22;60:16-22. Epub 2017 Feb 22.
    Department of Zoology, University of Allahabad, Allahabad 211002, U.P., India. Electronic address:
    Non-target organisms, including human and wildlife, are susceptible to deleterious effects of pesticide mixtures in their environment. Present study demonstrated the disruption of the hypothalamic-pituitary-thyroid (HPT) axis in a seasonally breeding wildlife bird Amandava amandava on co-exposure to dithiocarbamate mancozeb/MCZ and neonicotinoid imidacloprid/IMI, at concentrations even lower than respective environmentally realistic exposure level of each of the pesticide. Adult male birds (n=8/group) were exposed individually to 0. Read More

    [Human exposure and thyroid toxicity of polybrominated diphenyl ethers].
    Zhonghua Yu Fang Yi Xue Za Zhi 2017 Feb;51(2):188-192
    School of Public Health, Shanghai Jiao Tong university, Shanghai 200025, China.
    Polybrominated diphenyl ethers (PBDEs), a kind of important Brominated Flame Retardant (BFR), are widely used in electronic products, construction materials and textiles. PBDEs have been detected in many environmental media (including air, water, dust, sediment and food), many animal and human tissues. For their environmental persistence, high bioaccumulative and multiple biotoxicitiies, PBDEs have been viewed as one of the most concerned environmental Endocrine Disrupting Chemicals (EDCs) at present. Read More

    Transcriptional and Biochemical Alterations in Zebrafish Eleuthero-Embryos (Danio rerio) After Exposure to Synthetic Progestogen Dydrogesterone.
    Bull Environ Contam Toxicol 2017 Jul 18;99(1):39-45. Epub 2017 Feb 18.
    State Key Laboratory of Organic Geochemistry, CAS Research Centre of PRD Environmental Pollution and Control, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, 510640, Guangzhou, China.
    Little information has so far been known on the effects of synthetic progestogen dydrogesterone (DDG) in organisms like fish. This study aimed to investigate the effects of DDG on the transcriptional and biochemical alterations in zebrafish eleuthero-embryos. Zebrafish eleuthero-embryos were analyzed for the transcriptional alterations by real-time quantitative PCR (RT-qPCR) and biochemical changes by attenuated total reflection Fourier-transform infrared spectroscopy (ATR-FITR) after 144 h exposure to DDG. Read More

    Prediction of thyroid C-cell carcinogenicity after chronic administration of GLP1-R agonists in rodents.
    Toxicol Appl Pharmacol 2017 Apr 16;320:51-59. Epub 2017 Feb 16.
    Division of Toxicology, Leiden Academic Centre for Drug Research, Leiden University, Leiden, The Netherlands; Medicines Evaluation Board, Utrecht, The Netherlands. Electronic address:
    Increased incidence of C-cell carcinogenicity has been observed for glucagon-like-protein-1 receptor (GLP-1r) agonists in rodents. It is suggested that the duration of exposure is an indicator of carcinogenic potential in rodents of the different products on the market. Furthermore, the role of GLP-1-related mechanisms in the induction of C-cell carcinogenicity has gained increased attention by regulatory agencies. Read More

    Birds and flame retardants: A review of the toxic effects on birds of historical and novel flame retardants.
    Environ Res 2017 Apr 10;154:398-424. Epub 2017 Feb 10.
    Environment and Climate Change Canada, Canada Centre for Inland Waters, 867 Lakeshore Road, Burlington, Ontario, Canada L7S 1A1. Electronic address:
    Flame retardants (FRs) are a diverse group of chemicals, many of which persist in the environment and bioaccumulate in biota. Although some FRs have been withdrawn from manufacturing and commerce (e.g. Read More

    Disruption of thyroxine and sex hormones by 1,2-dibromo-4-(1,2-dibromoethyl)cyclohexane (DBE-DBCH) in American kestrels (Falco sparverius) and associations with reproductive and behavioral changes.
    Environ Res 2017 Apr 9;154:389-397. Epub 2017 Feb 9.
    Ecotoxicology & Wildlife Health Division, Science & Technology Branch, Environment and Climate Change Canada, Burlington, Ontario, Canada. Electronic address:
    1,2-dibromo-4-(1,2-dibromoethyl)cyclohexane (DBE-DBCH - formerly TBECH) is an emerging brominated flame retardant (BFR) pollutant with androgen potentiating ability and other endocrine disrupting effects in birds and fish. The objectives of this study were to determine the effects of exposure to environmentally-relevant levels of DBE-DBCH on circulating levels of thyroid and sex steroid hormones in American kestrels, and if hormonal concentrations were related to previously reported changes in reproductive success and courtship behaviors. Sixteen kestrel pairs were exposed to 0. Read More

    Developmental toxicity and thyroid hormone-disrupting effects of 2,4-dichloro-6-nitrophenol in Chinese rare minnow (Gobiocypris rarus).
    Aquat Toxicol 2017 Apr 4;185:40-47. Epub 2017 Feb 4.
    State Key Laboratory of Environmental Aquatic Chemistry, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, P. O. Box 2871, Beijing 100085, PR China.
    In the present study, to evaluate embryonic toxicity and the thyroid-disrupting effects of 2,4-dichloro-6-nitrophenol (DCNP), embryos and adults of Chinese rare minnow (Gobiocypris rarus) were exposed to 2, 20, and 200μg/L DCNP. In the embryo-larval assay, increased percentages of mortality and occurrence of malformations, decreased percentage of hatching, and decreased body length and body weight were observed after DCNP treatment. Moreover, the whole-body T3 levels were significantly increased at 20 and 200μg/L treatments, whereas the T4 levels were markedly decreased significantly (p<0. Read More

    Risk of cumulative toxicity after complete melanoma response with pembrolizumab.
    BMJ Case Rep 2017 Feb 1;2017. Epub 2017 Feb 1.
    Department of Medical Oncology, Royal Adelaide Hospital, Adelaide, South Australia, Australia.
    Pembrolizumab is an approved first-line systemic therapy for unresectable metastatic melanoma. Despite the achievement of complete and durable responses in a small subgroup of patients, it is standard practice that pembrolizumab therapy continues beyond complete response. Nevertheless, the incidence of immune-related toxicities gradually increases with continuing pembrolizumab therapy. Read More

    Activation of the Nrf2-Keap 1 Pathway in Short-Term Iodide Excess in Thyroid in Rats.
    Oxid Med Cell Longev 2017 4;2017:4383652. Epub 2017 Jan 4.
    Department of Physiology and Pathophysiology, School of Basic Medical Sciences, Tianjin Medical University, Tianjin 300070, China.
    Wistar rats were randomly divided into groups of varying iodide intake: normal iodide; 10 times high iodide; and 100 times high iodide on Days 7, 14, and 28. Insignificant changes were observed in thyroid hormone levels (p > 0.05). Read More

    Hypothesis-driven weight-of-evidence analysis of endocrine disruption potential: a case study with triclosan.
    Crit Rev Toxicol 2017 Apr 27;47(4):263-285. Epub 2017 Jan 27.
    b Colgate-Palmolive Company , Piscataway , NJ , USA.
    Triclosan is an antimicrobial agent used in a range of consumer products, such as deodorants, oral care, clothing, and household items. As with many consumer products, triclosan can be rinsed down the drain and transported to wastewater treatment plants. While most is eliminated during activated sludge sewage treatment by biodegradation and adsorption, some triclosan enters the aquatic environment and may expose wildlife. Read More

    An Overview of Selenium Uptake, Metabolism, and Toxicity in Plants.
    Front Plant Sci 2016 11;7:2074. Epub 2017 Jan 11.
    Ecotoxicogenomics Lab, Department of Biotechnology, Jamia Millia Islamia New Delhi, India.
    Selenium (Se) is an essential micronutrient for humans and animals, but lead to toxicity when taken in excessive amounts. Plants are the main source of dietary Se, but essentiality of Se for plants is still controversial. However, Se at low doses protects the plants from variety of abiotic stresses such as cold, drought, desiccation, and metal stress. Read More

    Endocrine disrupting pesticides impair the neuroendocrine regulation of reproductive behaviors and secondary sexual characters of red munia (Amandava amandava).
    Physiol Behav 2017 May 21;173:15-22. Epub 2017 Jan 21.
    Department of Zoology, University of Allahabad, Allahabad 211002, U.P., India. Electronic address:
    The exposure effects of two endocrine disrupting pesticides (EDPs), mancozeb/MCZ and imidacloprid/IMI of the group dithiocarbamate and neonicotinoid respectively, on reproductive behaviors and secondary sexual characters have been studied in a seasonally breeding wildlife bird, red munia (Amandava amandava). Adult male birds were exposed to both the pesticides individually (0.25% LD50 of each) as well as co-exposed (MIX-I: 0. Read More

    Thyroid pathology in deer mice (Peromyscus maniculata) from a reclaimed mine site on the athabasca oil sands.
    Environ Pollut 2017 Mar 16;222:42-49. Epub 2017 Jan 16.
    Department of Ecosystem and Public Health, Faculty of Veterinary Medicine, University of Calgary, 3280 Hospital Drive NW Calgary, Alberta T2N 4Z6, Canada. Electronic address:
    Information on naturally occurring thyroid disease in wild animals in general and in small mammals specifically is extremely limited. In the present field-based work, we investigated the structure and function of thyroid glands of deer mice (Peromyscus maniculata) studied as sentinels of ecosystem sustainability on reclaimed areas post-mining on the oil sands of northeastern Alberta, because of their greater sensitivity to contaminants relative to meadow voles (Microtus pennsylvanicus) on the same sites. Extraction of bitumen in the oil sands of northeastern Alberta, results in the release of contaminants including polycyclic aromatic compounds (PACs), metals, and metalloids to the environment that have a measurable biological cost to wildlife living in the affected areas. Read More

    Unraveling the different toxic effect of flufenoxuron on the thyroid endocrine system of the Mongolia racerunner (Eremias Argus) at different stages.
    Chemosphere 2017 Apr 4;172:210-216. Epub 2017 Jan 4.
    Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Shuangqing RD 18, Beijing, 100085, China. Electronic address:
    Flufenoxuron is a widely used pesticide to inhibit the synthesis of chitin during insect development and its effect on the growth of lizards has been little addressed. The hypothalamus-pituitary-thyroid (HPT) axis plays an important role on the development of lizards. In this study, the lizards at different development stages (proliferation and resting stages) were exposed to flufenoxuron for 21 days. Read More

    Effects of Long-Term In Vivo Exposure to Di-2-Ethylhexylphthalate on Thyroid Hormones and the TSH/TSHR Signaling Pathways in Wistar Rats.
    Int J Environ Res Public Health 2017 Jan 4;14(1). Epub 2017 Jan 4.
    Department of Environmental Hygiene, Public Health College, Harbin Medical University, Harbin 150081, China.
    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. Read More

    Adult hippocampal neurogenesis is impaired by transient and moderate developmental thyroid hormone disruption.
    Neurotoxicology 2017 Mar 31;59:9-21. Epub 2016 Dec 31.
    Department of Biomedical Sciences, New York Institute of Technology College of Osteopathic Medicine, Old Westbury, NY 11568, USA.
    The hippocampus maintains a capacity for neurogenesis throughout life, a capacity that is reduced in models of adult onset hypothyroidism. The effects of developmental thyroid hormone (TH) insufficiency on neurogenesis in the adult hippocampus, however, has not been examined. Graded degrees of TH insufficiency were induced in pregnant rat dams by administration of 0, 3 or 10ppm of 6-propylthiouracil (PTU) in drinking water from gestational day (GD) 6 until weaning. Read More

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