3,626 results match your criteria Toxicity Thyroid Hormone


Early-life exposure to tris (1,3-dichloro-2-propyl) phosphate caused multigenerational neurodevelopmental toxicity in zebrafish via altering maternal thyroid hormones transfer and epigenetic modifications.

Environ Pollut 2021 May 28;285:117471. Epub 2021 May 28.

State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan, 430072, China.

Tris (1,3-dichloro-2-propyl) phosphate (TDCIPP), an alternative to brominated flame retardants, might pose an exposure risk to humans and wild animals during fetal development. Our recent study suggested that short-term TDCIPP exposure during early development caused sex-dependent behavioral alteration in adults. In the present study, multigenerational neurodevelopmental toxicity upon early-life exposure of parental zebrafish was evaluated, and the possible underlying mechanisms were further explored. Read More

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Thyroid homeostasis in B6C3F1 mice upon sub-chronic exposure to trifluoroiodomethane (CFI).

Toxicol Ind Health 2021 Jun 2:7482337211019658. Epub 2021 Jun 2.

Honeywell International, Inc., Morris Plains, NJ, USA.

Trifluoroiodomethane (CFI) is a fire suppressant gas with potential for use in low global-warming refrigerant blends. Data from studies in rats suggest that the most sensitive health effect of CFI is thyroid hormone perturbation, but the rat is a particularly sensitive species for disruption of thyroid homeostasis. Mice appear to be less sensitive than rats but still a conservative model with respect to humans. Read More

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Towards a science-based testing strategy to identify maternal thyroid hormone imbalance and neurodevelopmental effects in the progeny - part II: how can key events of relevant adverse outcome pathways be addressed in toxicological assessments?

Crit Rev Toxicol 2021 Apr 2;51(4):328-358. Epub 2021 Jun 2.

BASF SE, Ludwigshafen, Germany.

The current understanding of thyroid-related adverse outcome pathways (AOPs) with adverse neurodevelopmental outcomes in mammals has been reviewed. This served to establish if standard rodent toxicity test methods and assays allow identifying thyroid-related modes-of-action potentially leading to adverse neurodevelopmental outcomes, and the human relevance of effects - in line with the European Commission's Endocrine Disruptor Criteria. The underlying hypothesis is that an understanding of the key events of relevant AOPs provides insight into differences in incidence, magnitude, or species sensitivity of adverse outcomes. Read More

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Parental transfer of nanopolystyrene-enhanced tris(1,3-dichloro-2-propyl) phosphate induces transgenerational thyroid disruption in zebrafish.

Aquat Toxicol 2021 Jul 19;236:105871. Epub 2021 May 19.

Key Laboratory of Environmental Materials and Pollution Control, Education Department of Jilin Province, Siping 136000, China; College of Environmental Science and Engineering, Jilin Normal University, Haifeng Street, Tiexi Dist, Siping 136000, China.

Plastic is a globally recognized superwaste that can affect human health and wildlife when it accumulates and is amplified in the food chain. Microplastics (plastic particles < 5 mm) and nanoplastics (plastic particles < 100 nm) can interact with organic pollutants already present in the aquatic environment, potentially acting as carriers for pollutants entering organisms and thus influencing the bioavailability and toxicity of those pollutants. In this study, we investigated the transfer kinetics and transgenerational effects of exposure to tris(1,3-dichloro-2-propyl) phosphate (TDCIPP) and polystyrene nanoplastics (PS-NPs) in F1 offspring. Read More

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Fish toxicity testing for identification of thyroid disrupting chemicals.

Environ Pollut 2021 May 18;284:117374. Epub 2021 May 18.

European Food Safety Authority Via Carlo Magno 1/A, 43126, Parma, Italy.

Identification of thyroid disrupting chemicals (TDCs), one of the most studied types of endocrine disruptors (EDs), is required according to EU regulations on industrial chemicals, pesticides, and biocides. Following that requirement, the use of fish as a unique non-mammalian model species for identification of EDs may be warranted. This study summarized and evaluated effects of TDCs on fish thyroid sensitive endpoints including thyroid hormones, thyroid related gene expression, immunostaining for thyroid follicles, eye size and pigmentation, swim bladder inflation as well as effects of TDCs on secondary sex characteristics, sex ratio, growth and reproduction. Read More

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Syringic acid, a novel thyroid hormone receptor-β agonist, ameliorates propylthiouracil-induced thyroid toxicity in rats.

J Biochem Mol Toxicol 2021 May 28:e22814. Epub 2021 May 28.

Department of Medicinal Chemistry, Banaras Hindu University, Varanasi, India.

The aim of this study was to evaluate the potential of syringic acid (SA) against propylthiouracil (PTU)-induced hypothyroidism in rats. SA at a prestandardized dose, 50 mg/kg/day, was orally administered to PTU-induced hypothyroid rats for 30 days, and alterations in the levels of serum triiodothyronine (T ), thyroxine (T ), thyrotropin (TSH), alanine transaminase (ALT), and aspartate transaminase (AST); tumor necrosis factor-α (TNF-α) and interleukin-6 (IL-6); total cholesterol (CHOL) and triglycerides (TG); hepatic lipid peroxidation (LPO) and antioxidants (superoxide dismutase, catalase, glutathione peroxidase, and glutathione content), as well as histological changes in liver and thyroid were examined. The molecular interactions of the ligand, SA, with thyroid-related protein targets, such as human thyroid hormone receptor β (hTRβ), and thyroid peroxidase (TPO) protein, were studied using molecular docking. Read More

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[Effects of Roxithromycin on Reproduction,Growth, and Anti-oxidation System of ].

Huan Jing Ke Xue 2021 Jun;42(6):3074-3083

Key Laboratory for Integrated Regulation and Resources Development on Shallow Lakes, Ministry of Education, College of Environment, Hohai University, Nanjing 210098, China.

Roxithromycin (ROX) is widespread in the water environment and has been reported to have ecotoxicological effects on aquatic organisms. To improve our understanding of these effects, we selected as a test organism to study acute and chronic ROX toxicity on reproduction, growth, and antioxidant systems. The acute ROX toxicity was low, with 48 h-LC and 96h-LCROX values of 60. Read More

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Effects of acute exposure to microcystins on hypothalamic-pituitary-adrenal (HPA), -gonad (HPG) and -thyroid (HPT) axes of female rats.

Sci Total Environ 2021 Jul 10;778:145196. Epub 2021 Feb 10.

Donghu Experimental Station of Lake Ecosystems, State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology (IHB), Chinese Academy of Sciences (CAS), Wuhan 430072, China; University of Chinese Academy of Sciences (UCAS), Beijing 100049, China; Institute for Ecological Research and Pollution Control of Plateau Lakes, School of Ecology and Environmental Science, Yunnan University, Kunming 650091, China.

Microcystins (MCs) are common, well-known cyanobacterial toxins that can affect health of humans. Recently, it has been reported that MCs affect endocrine functions. In the present study, for the first time, histopathology, concentrations of hormones and transcription of genes along the hypothalamic-pituitary-adrenal (HPA), hypothalamic-pituitary-gonad (HPG) and hypothalamic-pituitary-thyroid (HPT) axes were examined in rats exposed to microcystin-LR (MC-LR). Read More

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Toxic effects of Decabromodiphenyl ether (BDE-209) on thyroid of broiler chicks by transcriptome profile analysis.

Ecotoxicol Environ Saf 2021 Aug 21;219:112305. Epub 2021 May 21.

Institute for Agri-food Standards and Testing Technology, Shanghai Academy of Agricultural Science, Shanghai 201106, China. Electronic address:

The wide usage of decabromodiphenyl ether (BDE-209) results in its increasing occurrence in the environment and increasing attention in regard to human and animal health. BDE-209 is an endocrine disruptor for hypothyroidism, but the toxicity mechanism is unclear. Here, the histopathology and transcriptome sequencing of thyroid tissue from broiler chicks were investigated by supplemental feeding with different concentrations of BDE-209 for 42 days (0-4 g/kg in basal diet), followed by determining the levels of thyroid hormones in serum. Read More

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Graphene oxide and reduced graphene oxide promote the effects of exogenous T3 thyroid hormone in the amphibian Xenopus laevis.

Chemosphere 2021 May 17;281:130901. Epub 2021 May 17.

Laboratoire Ecologie Fonctionnelle et Environnement, Université de Toulouse, CNRS, INPT, UPS, Toulouse, France.

The interest for graphene-based nanomaterials (GBMs) is growing worldwide as their properties allow the development of new innovative applications. In parallel, concerns are increasing about their potential adverse effects on the environment are increasing. The available data concerning the potential risk associated to exposure of aquatic organisms to these GBMs are still limited and little is known regarding their endocrine disruption potential. Read More

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Endocrine, metabolic and apical effects of in utero and lactational exposure to non-dioxin-like 2,2',3,4,4',5,5'-heptachlorobiphenyl (PCB 180): A postnatal follow-up study in rats.

Reprod Toxicol 2021 Jun 13;102:109-127. Epub 2021 May 13.

School of Pharmacy (Toxicology), Department of Environmental and Biological Sciences, University of Eastern Finland, Kuopio, Finland.

PCB 180 is a persistent and abundant non-dioxin-like PCB (NDL-PCB). We determined the developmental toxicity profile of ultrapure PCB 180 in developing offspring following in utero and lactational exposure with the focus on endocrine, metabolic and retinoid system alterations. Pregnant rats were given total doses of 0, 10, 30, 100, 300 or 1000 mg PCB 180/kg bw on gestational days 7-10 by oral gavage, and the offspring were sampled on postnatal days (PND) 7, 35 and 84. Read More

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

Int J Mol Sci 2021 Apr 22;22(9). Epub 2021 Apr 22.

Institute of Animal Nutrition and Nutrition Physiology, Justus-Liebig-University Giessen, Heinrich-Buff-Ring 26-32, 35392 Giessen, Germany.

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. Read More

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Prenatal Phthalates Exposure and Cord Thyroid Hormones: A Birth Cohort Study in Southern Taiwan.

Int J Environ Res Public Health 2021 04 19;18(8). Epub 2021 Apr 19.

Research Center of Environmental Trace Toxic Substances, College of Medicine, National Cheng Kung University, Tainan 701, Taiwan.

Background: The regulation of thyroid hormones in the early stages of gestation plays a crucial role in the outcome of a pregnancy. Furthermore, thyroid hormones are fundamental for the fetal development of all organs, including endocrine hormone changes in uterus. Endocrine disrupting chemicals have been shown to have an effect on thyroid hormone homeostasis in newborns, which affects their later development. Read More

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Role of Electrostatic Interactions in Calcitonin Prefibrillar Oligomer-Induced Amyloid Neurotoxicity and Protective Effect of Neuraminidase.

Int J Mol Sci 2021 Apr 11;22(8). Epub 2021 Apr 11.

Centro Nazionale Malattie Rare, Istituto Superiore di Sanità, 00161 Rome, Italy.

Salmon calcitonin is a good model for studying amyloid behavior and neurotoxicity. Its slow aggregation rate allows the purification of low molecular weight prefibrillar oligomers, which are the most toxic species. It has been proposed that these species may cause amyloid pore formation in neuronal membranes through contact with negatively charged sialic acid residues of the ganglioside GM1. Read More

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Perinatal Exposure to Phthalates: From Endocrine to Neurodevelopment Effects.

Int J Mol Sci 2021 Apr 14;22(8). Epub 2021 Apr 14.

Pediatric Unit, Department of Medical and Surgical Sciences of the Mothers, Children and Adults, University of Modena and Reggio Emilia, 41124 Modena, Italy.

Phthalates, as other endocrine disrupting chemicals (EDCs), may alter the homeostasis and the action of hormones and signaling molecules, causing adverse health outcomes. This is true especially for infants, who are both more exposed and sensitive to their effects. Phthalates are particularly harmful when the exposure occurs during certain critical temporal windows of the development, such as the prenatal and the early postnatal phases. Read More

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Identification of non-validated endocrine disrupting chemical characterization methods by screening of the literature using artificial intelligence and by database exploration.

Environ Int 2021 Apr 23;154:106574. Epub 2021 Apr 23.

Université de Paris, T3S, Inserm UMR S-1124, F-75006 Paris, France. Electronic address:

Background: Exposure to endocrine disrupting chemicals (EDCs) represents a critical public health threat. Several adverse health outcomes (e.g. Read More

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Testing for heterotopia formation in rats after developmental exposure to selected in vitro inhibitors of thyroperoxidase.

Environ Pollut 2021 Apr 12;283:117135. Epub 2021 Apr 12.

Division of Diet, Disease Prevention and Toxicology, National Food Institute, Technical University of Denmark, Kgs. Lyngby, DK-2800, Denmark. Electronic address:

The thyroperoxidase (TPO) enzyme is expressed by the thyroid follicular cells and is required for thyroid hormone synthesis. In turn, thyroid hormones are essential for brain development, thus inhibition of TPO in early life can have life-long consequences for brain function. If environmental chemicals with the capacity to inhibit TPO in vitro can also alter brain development in vivo through thyroid hormone dependent mechanisms, however, remains unknown. Read More

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Bilateral retinal toxicity as a result of poisoning with pure iodine.

Rom J Ophthalmol 2021 Jan-Mar;65(1):73-75

Ophthalmology Department, University of Health Sciences Ulucanlar Eye Training and Research Hospital, Ankara, Turkey.

Iodine is an essential mineral that is necessary for the synthesis of thyroid hormones, which can cause many diseases in the body. The application of adding potassium iodate to table salts started in Turkey in 1998. High doses of iodate cause retinal toxicity, leading to significant vision loss. Read More

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Could Glyphosate and Glyphosate-Based Herbicides Be Associated With Increased Thyroid Diseases Worldwide?

Front Endocrinol (Lausanne) 2021 19;12:627167. Epub 2021 Mar 19.

Department of Medicine, State University of Central-West, Guarapuava, Brazil.

The increased incidence of thyroid diseases raises a series of questions about what the main predisposing factors are nowadays. If dietary restriction of iodine was once a major global health concern, today, the processes of industrialization of food and high exposure to a wide variety of environmental chemicals may be affecting, directly or indirectly, thyroid function. The homeostasis of hypothalamus-pituitary-thyroid (HPT) axis is finely regulated through the negative feedback mechanism exerted by thyroid hormones. Read More

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THYROID STATUS: IS IT POSSIBLE TO RESTORE MYELIN?

Georgian Med News 2021 Feb(311):143-146

North-Western State Medical University named after I.I. Mechnikov, Saint-Petersburg, Russia.

The number of demyelinating diseases of central nervous system are prone to grow nowadays. The most socially significant and well studied one is multiple sclerosis. The search of susbstances that would stop demyelinisation or reinforce the process of remyelination is in great request. Read More

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February 2021

Effects of tetrabromobisphenol A (TBBPA) on the reproductive health of male rodents: A systematic review and meta-analysis.

Sci Total Environ 2021 Aug 26;781:146745. Epub 2021 Mar 26.

Global Centre for Environmental Remediation, ATC Building, Faculty of Science, The University of Newcastle, University Drive, Callaghan, NSW 2308, Australia. Electronic address:

Tetrabromobisphenol A (TBBPA) is a type of brominated flame retardant widely detected in the environment and organisms. It has been reported to cause cytotoxicity and disrupt endocrine system of animals. However, the effect of TBBPA on the reproductive system of male rodents is still controversial. Read More

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Dioctyl Sodium Sulfosuccinate as a Potential Endocrine Disruptor of Thyroid Hormone Activity in American bullfrog, Rana (Lithobates) catesbeiana, Tadpoles.

Arch Environ Contam Toxicol 2021 May 28;80(4):726-734. Epub 2021 Mar 28.

Department of Biochemistry and Microbiology, University of Victoria, 3800 Finnerty Road, Victoria, BC, V8P 5C2, Canada.

The thyroid hormones, thyroxine (T) and triiodothyronine (T), are required to regulate complex developmental processes in vertebrates and are highly sensitive to endocrine-disrupting compounds. Previous studies demonstrate that dioctyl sodium sulfosuccinate (DOSS), a common constituent of pharmaceuticals, cosmetics, and food products, disrupts canonical signaling of adipocyte differentiation by binding a nuclear hormone receptor in the same superfamily as thyroid hormone (TH) receptors. The present study was designed to determine whether DOSS is capable of disrupting TH signaling using the American bullfrog, Rana (Lithobates) catesbeiana-a cosmopolitan frog species that undergoes TH-dependent metamorphosis to transition from an aquatic tadpole to a terrestrial juvenile frog. Read More

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Predicting consequences of POP-induced disruption of blubber glucose uptake, mass gain rate and thyroid hormone levels for weaning mass in grey seal pups.

Environ Int 2021 07 23;152:106506. Epub 2021 Mar 23.

Sea Mammal Research Unit, Scottish Oceans Institute, University of St Andrews, St Andrews, Fife KY 16 8LB, UK. Electronic address:

Persistent organic pollutants (POPs) are endocrine disruptors that alter adipose tissue development, regulation and function. Top marine predators are particularly vulnerable because they possess large fat stores that accumulate POPs. However, links between endocrine or adipose tissue function disruption and whole animal energetics have rarely been investigated. Read More

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Investigation of NH3 as a selective thyroid hormone receptor modulator in larval zebrafish (Danio rerio).

Neurotoxicology 2021 May 18;84:96-104. Epub 2021 Mar 18.

Department of Molecular Biosciences, University of California-Davis School of Veterinary Medicine, Davis, CA, 95616, United States. Electronic address:

Thyroid hormones (THs) are essential for normal vertebrate development and diverse environmental chemicals are hypothesized to cause developmental toxicity by disrupting TH-mediated signaling. The larval zebrafish (Danio rerio) is an emerging in vivo model of developmental TH disruption; however, the effects of TR antagonism have not yet been studied in zebrafish. NH3, generally considered a potent and specific thyroid hormone receptor (TR) antagonist, has been used in rodents and Xenopus laevis to characterize phenotypes of TR antagonism. Read More

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Mediation effects of thyroid function in the associations between phthalate exposure and glucose metabolism in adults.

Environ Pollut 2021 Jun 8;278:116799. Epub 2021 Mar 8.

Department of Medical Research, China Medical University Hospital, China Medical University, Taichung, Taiwan; Research Center for Environmental Medicine, Kaohsiung Medical University, Kaohsiung, Taiwan; Department of Safety, Health and Environmental Engineering, National United University, Miaoli, Taiwan; National Institute of Environmental Health Sciences, National Health Research Institutes, Miaoli, Taiwan. Electronic address:

The mediating influence of thyroid function on the association of phthalate exposure with glucose metabolism, including insulin resistance, remains unclear. We explored the mediating influence of thyroid hormone levels on the phthalate exposure-insulin resistance association. This cross-sectional study of 217 Taiwanese adults assessed insulin resistance (Homeostatic Model Assessment for Insulin Resistance, HOMA-IR scores) and the levels of 11 urinary phthalate metabolites and 5 thyroid hormones. Read More

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Effects of exposure to urban particulate matter SRM 1648a during pregnancy on the neurobehavioral development of offspring mice.

Ecotoxicol Environ Saf 2021 Jun 17;215:112142. Epub 2021 Mar 17.

State Key Laboratory of Reproductive Medicine, Center for Global Health, School of Public Health, Nanjing Medical University, Nanjing 211166, China; Key Laboratory of Modern Toxicology of Ministry of Education, School of Public Health, Nanjing Medical University, Nanjing 211166, China. Electronic address:

The development of the nervous system is crucial to a child's health. However, the nervous system is also susceptible to a variety of factors during development. To date, epidemiological studies have reported controversial results on the relationship between prenatal exposure to particulate matter (PM) and neurobehavioral development. Read More

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Influence of perfluoroalkyl acids and other parameters on circulating thyroid hormones and immune-related microRNA expression in free-ranging nestling peregrine falcons.

Sci Total Environ 2021 May 23;770:145346. Epub 2021 Jan 23.

Ecotoxicology and Wildlife Health Division, Wildlife and Landscape Science Directorate, Environment and Climate Change Canada, L7S 1A1 Burlington, Ontario, Canada. Electronic address:

Exposure to certain perfluoroalkyl acids (PFAAs) can have considerable effects on the endocrine and immune systems, although such effects remain largely uncharacterized in wildlife. Using an apex avian predator, we investigated possible relationships of thyroid hormones (THs), specifically free (F) and total (T) thyroxine (FT4; TT4) and triiodothyronine (FT3; TT3), and the expression of an immune-related microRNA biomarker (i.e. Read More

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Update of the risk assessment of hexabromocyclododecanes (HBCDDs) in food.

EFSA J 2021 Mar 8;19(3):e06421. Epub 2021 Mar 8.

The European Commission asked EFSA to update its 2011 risk assessment on hexabromocyclododecanes (HBCDDs) in food. HBCDDs, predominantly mixtures of the stereoisomers α-, β- and γ-HBCDD, were widely used additive flame retardants. Concern has been raised because of the occurrence of HBCDDs in the environment, food and in humans. Read More

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Sub-chronic exposure to ammonia inhibits the growth of juvenile Wuchang bream (Megalobrama amblycephala) mainly by downregulation of growth hormone/insulin-like growth factor axis.

Environ Toxicol 2021 Jun 15;36(6):1195-1205. Epub 2021 Mar 15.

College of Fisheries, Huazhong Agricultural University, Wuhan, China.

In this study, healthy Wuchang bream (Megalobrama amblycephala) juveniles were exposed to 0, 5, 10, 20 and 30 mg/L total ammonia nitrogen for 30 days to elucidate toxic effects and mechanisms of ammonia on growth performance involved with the regulation of growth hormone/insulin-like growth factor (GH/IGF) and hypothalamic-pituitary-thyroid (HPT) axes. Our results showed that the increasing total ammonia nitrogen concentrations caused dose-depend decreases in the weight gain and specific growth rate but increases in the food conversion ratio and mortality in juvenile bream, indicating growth inhibitory effects induced by ammonia. Concurrently, GH, IGF-1 at protein and mRNA levels were significantly decreased in ammonia exposure groups (p < . Read More

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Appraisal of amiodarone-loaded PLGA nanoparticles for prospective safety and toxicity in a rat model.

Life Sci 2021 Jun 11;274:119344. Epub 2021 Mar 11.

Department of Pharmaceutics, Faculty of Pharmacy, Mansoura University, P.O. Box 35516, Mansoura, Egypt.

Aims: Amiodarone (AM) is a highly efficient drug for arrhythmias treatment, but its extra-cardiac adverse effects offset its therapeutic efficacy. Nanoparticles (NPs)-based delivery system could provide a strategy to allow sustained delivery of AM to the myocardium and reduction of adverse effects. The primary purpose was to develop AM-loaded NPs and explore their ameliorative effects versus off-target toxicities. Read More

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