10,174 results match your criteria tcdd


Neurons expressing the aryl hydrocarbon receptor in the locus coeruleus and island of Calleja major are novel targets of dioxin in the mouse brain.

Histochem Cell Biol 2021 May 8. Epub 2021 May 8.

Laboratory of Environmental Health Sciences, Center for Disease Biology and Integrative Medicine, Graduate School of Medicine, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-0033, Japan.

The aryl hydrocarbon receptor (AhR) acts as a receptor that responds to ligands, including dioxin. The AhR-ligand complex translocates from the cytoplasm into the nucleus to induce gene expression. Because dioxin exposure impairs cognitive and neurobehavioral functions, AhR-expressing neurons need to be identified for elucidation of the dioxin neurotoxicity mechanism. Read More

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Effects of Low-Dose Gestational TCDD Exposure on Behavior and on Hippocampal Neuron Morphology and Gene Expression in Mice.

Environ Health Perspect 2021 May 6;129(5):57002. Epub 2021 May 6.

Centre for Craniofacial and Regenerative Biology, King's College London, London, UK.

Background: 2,3,7,8-tetrachlorodibenzo--dioxin (TCDD) is a persistent and toxic environmental pollutant. Gestational exposure to TCDD has been linked to cognitive and motor deficits, and increased incidence of autism spectrum disorder (ASD) traits in children. Most animal studies of these neurodevelopmental effects involve acute TCDD exposure, which does not model typical exposure in humans. Read More

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Extended detail contrasts for TO.10 use on flat panel detector fluoroscopy systems.

Br J Radiol 2021 May 6:20201422. Epub 2021 May 6.

Mater Misericordiae University Hospital, Dublin, Ireland.

Objectives: Leeds Test Object Ten (TO.10) is routinely used to subjectively estimate Threshold Contrast Detail Detectability (TCDD) as a measure of image quality in fluoroscopy. However, manufacturer guidance provides calibrated contrasts for only limited peak voltage and copper filtration thickness combinations. Read More

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Identification of a Sensitive Human Immunological Target of Aryl Hydrocarbon Receptor Activation: CD5 Innate-Like B Cells.

Front Immunol 2021 15;12:635748. Epub 2021 Apr 15.

Institute for Integrative Toxicology, Michigan State University, East Lansing, MI, United States.

Xenobiotic-mediated activation of the aryl hydrocarbon receptor (AHR) is immunotoxic in a number of immune cell types, with the B cell being a well-established sensitive target. Recent advances have provided evidence that the B cell repertoire is a heterogeneous population, with subpopulations exhibiting vastly different cellular and functional phenotypes. Recent work from our laboratory identified the T cell specific kinase lck as being differentially regulated by (TCDD), which is a potent activator of AHR. Read More

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Rapamycin Alleviates 2,3,7,8-Tetrachlorodibenzo-p-dioxin-Induced Aggravated Dermatitis in Mice with Imiquimod-Induced Psoriasis-Like Dermatitis by Inducing Autophagy.

Int J Mol Sci 2021 Apr 12;22(8). Epub 2021 Apr 12.

Department of Dermatology, Kangnam Sacred Heart Hospital, College of Medicine, Hallym University, Seoul 07441, Korea.

Recently, the mTOR signaling has emerged as an important player in the pathogenesis of psoriasis. We previously found that 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD)-induced psoriatic skin inflammation was related to the inhibition of autophagy in keratinocytes. However, the effects and detailed molecular mechanisms of the mTOR inhibitor rapamycin and TCDD on psoriasis in vivo remain to be elucidated. Read More

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2,3,7,8-Tetrachlorodibenzo--Dioxin Regulates the Expression of Aryl Hydrocarbon Receptor-Related Factors and Cytokines in Peripheral Blood Mononuclear Cells and CD4+ T cells from Patients with Atopic Dermatitis and Psoriasis.

Ann Dermatol 2020 Oct 29;32(5):360-369. Epub 2020 Sep 29.

Department of Dermatology, Kangnam Sacred Heart Hospital, College of Medicine, Hallym University, Seoul, Korea.

Background: Aryl hydrocarbon receptor (AhR), a ligand-activated transcription factor, is important for xenobiotic metabolism and binds to various endogenous and exogenous ligands in the skin. However, the functional role of AhR in patients with psoriasis (PS) and atopic dermatitis (AD) remains unclear.

Objective: We aimed to determine whether AhR-regulated factors (AhR, CYP1A1, interleukin [IL]-17, IL-22) were affected by AhR ligands (2,3,7,8-tetrachlorodibenzo--dioxin, TCDD) in chronic inflammatory skin diseases such as PS and AD. Read More

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October 2020

Using Polychlorinated Naphthalene Concentrations in the Soil from a Southeast China E-Waste Recycling Area in a Novel Screening-Level Multipathway Human Cancer Risk Assessment.

Environ Sci Technol 2021 Apr 26. Epub 2021 Apr 26.

National Research Center for Environmental Analysis and Measurement, Beijing 100029, China.

Polychlorinated naphthalene (PCN) concentrations in the soil at an e-waste recycling area in Guiyu, China, were measured and the associated human cancer risk due to e-waste-related exposures was investigated. We quantified PCNs in the agricultural soil and used these concentrations with predictive equations to calculate theoretical concentrations in outdoor air. We then calculated theoretical concentrations in indoor air using an attenuation factor and in the local diet using previously published models for contaminant uptake in plants and fruits. Read More

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Occurrence and spatial distribution of dioxin and dioxin-like compounds in topsoil of Taranto (Apulia, Italy) by GC-MS analysis and DR-CALUX® bioassay.

Chemosphere 2021 Apr 17;279:130576. Epub 2021 Apr 17.

Department of Physical, Earth and Environmental Sciences, University of Siena, Siena, Italy.

The aim of the present study was to assess the occurrence and spatial distribution of PCDD/Fs and dioxin-like compounds in topsoils of Taranto (Apulia Region), one of the most heavily industrialized and contaminated area of Southern Italy. A combined approach of chemical analysis by GC-MS/MS and AhR reporter gene bioassay was applied in a subset of topsoil samples (n = 20) collected in 2017-18 from ten sites embracing three levels of risk (from high to low) in the framework of a large survey inside Taranto municipality. TCDD-BEQs and GC-MS/MS TEQ and TEQ revealed a decreasing trend with the distance from main industrial settings and landfill areas. Read More

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DNA methylation in the adipose tissue and whole blood of Agent Orange-exposed Operation Ranch Hand veterans: a pilot study.

Environ Health 2021 Apr 13;20(1):43. Epub 2021 Apr 13.

Department of Epidemiology, Brown University School of Public Health, Providence, RI, 02912, USA.

Background: Between 1962 and 1971, the US Air Force sprayed Agent Orange across Vietnam, exposing many soldiers to this dioxin-containing herbicide. Several negative health outcomes have been linked to Agent Orange exposure, but data is lacking on the effects this chemical has on the genome. Therefore, we sought to characterize the impact of Agent Orange exposure on DNA methylation in the whole blood and adipose tissue of veterans enrolled in the Air Force Health Study (AFHS). Read More

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Susceptibility to DNA damage caused by abrogation of Rad54 homolog B: A putative mechanism for chemically induced cleft palate.

Toxicology 2021 Apr 3;456:152772. Epub 2021 Apr 3.

The State Key Laboratory Breeding Base of Basic Science of Stomatology (Hubei-MOST) & Key Laboratory of Oral Biomedicine Ministry of Education, School & Hospital of Stomatology, Wuhan University, Wuhan, Hubei, PR China. Electronic address:

Exposure to environmental toxicants such as all-trans retinoic acid (atRA) and 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD) may cause cleft palate (CP), which process is related to DNA damage. Rad54B, an important DNA damage repaired protein, has been proved to be associated with non-syndromic cleft lip with palate (NSCLP). In the present study, we sought to clarify the role of Rad54B in palatal development and environment-induced CP. Read More

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Endocrine disrupting chemicals and breast cancer: a systematic review of epidemiological studies.

Crit Rev Food Sci Nutr 2021 Apr 5:1-27. Epub 2021 Apr 5.

Faculty of Science, School of Biological Sciences, The University of Hong Kong, Pokfulam, Hong Kong S.A.R.

Background: Endocrine-disrupting compounds (EDCs) are ubiquitous substances that are found in our everyday lives, including pesticides, plasticizers, pharmaceutical agents, personal care products, and also in food products and food packaging. Increasing epidemiological evidence suggest that EDCs may affect the development or progression of breast cancer and consequently lead to lifelong harmful health consequences, especially when exposure occurs during early life in humans. Yet so far no appraisal of the available evidence has been conducted on this topic. Read More

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The role of MEG3 in the proliferation of palatal mesenchymal cells is related to the TGFβ/Smad pathway in TCDD inducing cleft palate.

Toxicol Appl Pharmacol 2021 05 1;419:115517. Epub 2021 Apr 1.

School of Public Health, Zhengzhou University, Zhengzhou, Henan, China. Electronic address:

Cleft palate (CP) is a common birth defect with a high incidence of occurrence in humans. The 2, 3, 7, 8-tetrachlorodibenzo-p-dioxin (TCDD) is a highly toxic halogenated aromatic hydrocarbon, with a strong CP effect on mice. Increasing recent evidences have shown that long-noncoding RNAs (lncRNAs) play an important role in several diseases, including CP. Read More

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Functional involvement of caleosin/peroxygenase PdPXG4 in the accumulation of date palm leaf lipid droplets after exposure to dioxins.

Environ Pollut 2021 Mar 20;281:116966. Epub 2021 Mar 20.

Genomics and Computational Biology Research Group, University of South Wales, NP7 7ET, United Kingdom. Electronic address:

Dioxins are highly injurious environmental pollutants with proven toxicological effects on both animals and humans, but to date their effects on plants still need to be studied in detail. We identified a dioxin-inducible caleosin/peroxygenase isoform, PdPXG4, that is mostly expressed in leaves of date palm seedlings and exhibits a specific reductase activity towards the 13-hydroperoxide of C18:2 and C18:3 (HpODE and HpOTrE, respectively). After exposure to TCDD, lipid droplets (LDs) isolated from TCDD-exposed leaves were about 6. Read More

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[Characterization and Health Risks of PCDD/Fs, PCBs, and PCNs in the Soil Around a Typical Secondary Copper Smelter].

Huan Jing Ke Xue 2021 Mar;42(3):1141-1151

College of Life and Environmental Science, Minzu University of China, Beijing 100081, China.

The concentrations of PCDD/Fs, PCBs, and PCNs in the soil samples around a typical secondary copper smelter were determined simultaneously, and then the impact of the smelter on the surrounding environment and the health risks of workers in the study area were analyzed and evaluated. PCDD/F, PCB, and PCN concentrations were in the range of 17.2-370, 1. Read More

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LncRNA XIST Promoted OGD-Induced Neuronal Injury Through Modulating/miR-455-3p/TIPARP Axis.

Neurochem Res 2021 Jun 18;46(6):1447-1456. Epub 2021 Mar 18.

Department of Rehabilitation Medicine, The Central Hospital of Wuhan, Tongji Medical College, Huazhong University of Science and Technology, 26 Shengli Street, Wuhan, 430014, Hubei, China.

In recent years, the incidence of ischemic stroke has gradually increased, but its pathogenesis has not been fully elucidated. lncRNAs played an important role in the occurrence and regulation of disease, but the research on ischemic stroke is very limited. Therefore, the role of lncRNA in ischemic stroke needs further exploration. Read More

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2,3,7,8-Tetrachlorodibenzo-p-dioxin exposure disrupts development of the visceral and ocular vasculature.

Aquat Toxicol 2021 May 24;234:105786. Epub 2021 Feb 24.

Department of Pathology and Laboratory Medicine, Brown University, Providence, RI, USA. Electronic address:

The aryl hydrocarbon receptor (AHR) has endogenous functions in mammalian vascular development and is necessary for mediating the toxic effects of a number of environmental contaminants. Studies in mice have demonstrated that AHR is necessary for the formation of the renal, retinal, and hepatic vasculature. In fish, exposure to the prototypic AHR agonist 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD) induces expression of the AHR biomarker cyp1a throughout the developing vasculature and produces vascular malformations in the head and heart. Read More

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Genetics-Based Approach to Identify Novel Genes Regulated by the Aryl Hydrocarbon Receptor (AHR) in Mice Liver.

Toxicol Sci 2021 Mar 15. Epub 2021 Mar 15.

Institute for Integrative Toxicology, Michigan State University, East Lansing, MI.

The aryl hydrocarbon receptor (AHR) is a ligand-activated transcription factor in the PAS superfamily of environmental sensors that is linked to several metabolic diseases, including non-alcoholic fatty liver disease (NAFLD). Much remains unknown regarding the impact of genetic variation in AHR-driven disease, as past studies have focused on a small number of inbred strains. Recently, the presence of a wide-range of interindividual variability amongst humans was reported in response to 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD), the prototypical ligand of the AHR. Read More

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Attenuation of growth hormone production at the fetal stage is critical for dioxin-induced developmental disorder in rat offspring.

Biochem Pharmacol 2021 Apr 10;186:114495. Epub 2021 Mar 10.

Laboratory of Molecular Life Sciences, Graduate School of Pharmaceutical Sciences, Kyushu University, Fukuoka, Japan; Division of Pharmaceutical Cell Biology, Graduate School of Pharmaceutical Sciences, Kyushu University, Fukuoka, Japan. Electronic address:

Although dioxins and related chemicals have been suspected to disrupt child development, their toxic mechanism remains poorly understood. Our previous studies in rat fetuses revealed that maternal exposure to 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD), a highly-toxic dioxin, suppresses fetal synthesis of pituitary growth hormone (GH) that is essential for development. This study examined the hypothesis that attenuating GH expression in fetuses triggers developmental disorders. Read More

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Identification of viable TCDD access pathways to human AhR PAS-B ligand binding domain.

J Mol Graph Model 2021 Jun 3;105:107886. Epub 2021 Mar 3.

Dipartimento di Chimica, Università degli Studi di Milano, via Golgi 19, I-20133, Milano, Italy. Electronic address:

Unintentionally released in the environment as by-products of industrial activities, dioxins, exemplified by 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD), represent a primary concern for human health. Exposure to these chemicals is known to produce a broad spectrum of adverse effects, including cancer. The main mechanism of action of TCDD in humans involves binding to the Aryl hydrocarbon Receptor (AhR). Read More

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Prolonged Low-Dose Dioxin Exposure Impairs Metabolic Adaptability to High-Fat Diet Feeding in Female but Not Male Mice.

Endocrinology 2021 Jun;162(6)

Department of Biology & Institute of Biochemistry, Carleton University, Ottawa, Ontario, K1S 5B6, Canada.

Context: Human studies consistently show an association between exposure to persistent organic pollutants, including 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD, aka "dioxin"), and increased diabetes risk. We previously showed that a single high-dose TCDD exposure (20 µg/kg) decreased plasma insulin levels in male and female mice in vivo, but effects on glucose homeostasis were sex-dependent.

Objective: The current study assessed whether prolonged exposure to a physiologically relevant low-dose of TCDD impacts glucose homeostasis and/or the islet phenotype in a sex-dependent manner in chow-fed or high-fat diet (HFD)-fed mice. Read More

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Coupling high-performance thin-layer chromatography with a battery of cell-based assays reveals bioactive components in wastewater and landfill leachates.

Ecotoxicol Environ Saf 2021 May 6;214:112092. Epub 2021 Mar 6.

Federal Institute of Hydrology, Department G3 Biochemistry and Ecotoxicology, Am Mainzer Tor 1, D-56068 Koblenz, Germany.

Over the last two decades, effect-directed analysis (EDA) gained importance as a seminal screening tool for tracking biological effects of environmental organic micro-pollutants (MPs). As EDA using high-performance liquid chromatography and bioassays is costly and time consuming, recent implementations of this approach have combined high-performance thin-layer chromatography (HPTLC) with effect-based methods (EBMs) using cell-based bioassays, enabling the detection of estrogenic, androgenic, genotoxic, photosystem II (PSII)- inhibiting, and dioxin-like sample components on a HPTLC plate. In the present study, the developed methodologies were applied as a HPTLC-based bioassay battery, to investigate toxicant elimination efficiency of wastewater treatment plants (WWTPs), and to characterize the toxic potential of landfill leachates. Read More

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Toxicity studies of hexachlorobenzene administered by gavage to female Sprague Dawley (Hsd:Sprague Dawley SD) rats.

Authors:

Toxic Rep Ser 2021 Mar(77)

Despite the cessation of its production and use in many parts of the world, hexachlorobenzene (HCB) remains highly persistent in the environment, and chronic, low-dose exposure to HCB in humans continues. Its structural resemblance to 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD), ability to activate the aryl hydrocarbon (Ah) receptor, TCDD-like toxicities, and bioaccumulative nature suggest HCB be included in the toxic equivalency factor (TEF) methodology. Consequently, the National Toxicology Program conducted this subchronic study of HCB, including measurement of a variety of toxicological and biochemical endpoints, to allow comparison to TCDD data obtained in a previous 2-year bioassay. Read More

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Environmental characteristics and formations of polybrominated dibenzo-p-dioxins and dibenzofurans.

Environ Int 2021 07 5;152:106450. Epub 2021 Mar 5.

State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, P.O. Box 2871, Beijing 100085, China; School of Environment, Hangzhou Institute for Advanced Study, UCAS, Hangzhou 310000, China; Institute of Environment and Health, Jianghan University, Wuhan 430056, China. Electronic address:

Polybrominated dibenzo-p-dioxins and furans (PBDD/Fs) are emerging persistent organic pollutants (POPs) that have similar or higher toxicities than the notorious dioxins. Toxicities, formation mechanisms, and environmental fates of PBDD/Fs are lacking because accurate quantification, especially of higher brominated congeners, is challenging. PBDD/F analysis is difficult because of photolysis and thermal degradation and interference from polybrominated diphenyl ethers. Read More

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Aggressiveness and Metastatic Potential of Breast Cancer Cells Co-Cultured with Preadipocytes and Exposed to an Environmental Pollutant Dioxin: An and Zebrafish Study.

Environ Health Perspect 2021 Mar 8;129(3):37002. Epub 2021 Mar 8.

UMR-S1124, Institut national de la santé et de la recherché médicale (Inserm), T3S, Toxicologie Environnementale, Cibles thérapeutiques, Signalisation cellulaire et Biomarqueurs, Paris, France.

Background: Breast cancer (BC) is a major public health concern, and its prognosis is very poor once metastasis occurs. The tumor microenvironment and chemical pollution have been suggested recently to contribute, independently, to the development of metastatic cells. The BC microenvironment consists, in part, of adipocytes and preadipocytes in which persistent organic pollutants (POPs) can be stored. Read More

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TCDD induced lipid accumulation by impairment of autophagic flux in THP-1 macrophages.

Environ Sci Pollut Res Int 2021 Mar 8. Epub 2021 Mar 8.

College of Food Science and Engineering, Jilin University, Changchun, Jilin, 130062, People's Republic of China.

2,3,7,8-Tetrachlorodibenzo-p-dioxin (TCDD) is a well-known environmental and food contaminant generated as a byproduct of various industrial activities. It is found in a lot of foods, especially in dairy products, eggs, fish, and meat. Autophagy is a highly conserved cellular degradation and cycling process, which plays an important role in lipid metabolism. Read More

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AhR Ligands Differentially Regulate miRNA-132 Which Targets HMGB1 and to Control the Differentiation of Tregs and Th-17 Cells During Delayed-Type Hypersensitivity Response.

Front Immunol 2021 19;12:635903. Epub 2021 Feb 19.

Department of Pathology, Microbiology and Immunology, School of Medicine, University of South Carolina, Columbia, SC, United States.

Aryl hydrocarbon receptor (AhR), is a transcription factor and an environmental sensor that has been shown to regulate T cell differentiation. Interestingly, AhR ligands exert varying effects from suppression to exacerbation of inflammation through induction of Tregs and Th-17 cells, respectively. In the current study, we investigated whether the differential effects of AhR ligands on T cell differentiation are mediated by miRNA during delayed-type hypersensitivity (DTH) reaction against methylated Bovine Serum Albumin (mBSA). Read More

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February 2021

Effect of exposure to 2,3,7,8-Tetrachlorodibenzo-p-dioxin (TCDD) and polychlorinated biphenyls (PCBs) on mitochondrial DNA (mtDNA) copy number in rats.

Toxicology 2021 04 4;454:152744. Epub 2021 Mar 4.

Department of Pharmacology and Toxicology, Jacobs School of Medicine and Biomedical Sciences, University at Buffalo, Buffalo, NY, USA; Department of Epidemiology and Environmental Health, School of Public Health and Health Professions, University at Buffalo, Buffalo, NY, USA. Electronic address:

Mitochondria are intracellular organelles responsible for biological oxidation and energy production. These organelles are susceptible to damage from oxidative stress and compensate for damage by increasing the number of copies of their own genome, mitochondrial DNA (mtDNA). Cancer and environmental exposure to some pollutants have also been associated with altered mtDNA copy number. Read More

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Trajectory Shifts in Interdisciplinary Research of the Aryl Hydrocarbon Receptor-A Personal Perspective on Thymus and Skin.

Authors:
Charlotte Esser

Int J Mol Sci 2021 Feb 12;22(4). Epub 2021 Feb 12.

IUF-Leibniz Research Institute for Environmental Medicine, Auf'm Hennekamp 50, 40225 Düsseldorf, Germany.

Identifying historical trajectories is a useful exercise in research, as it helps clarify important, perhaps even "paradigmatic", shifts in thinking and moving forward in science. In this review, the development of research regarding the role of the transcription factor "aryl hydrocarbon receptor" (AHR) as a mediator of the toxicity of environmental pollution towards a link between the environment and a healthy adaptive response of the immune system and the skin is discussed. From this fascinating development, the opportunities for targeting the AHR in the therapy of many diseases become clear. Read More

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February 2021

PCB and TCDD derived embryonic cardiac defects result from a novel AhR pathway.

Aquat Toxicol 2021 Apr 25;233:105794. Epub 2021 Feb 25.

Department of Biology, Queens College, City University of New York, 65-30 Kissena Blvd, Queens NY 11367-1597, USA; The Graduate Center, City University of New York, 365 Fifth Avenue, New York, NY 10016, USA. Electronic address:

Polychlorinated biphenyls (PCBs) and 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD) are environmental contaminants known to impact cardiac development, a key step in the embryonic development of most animals. To date, little is understood of the molecular mechanism driving the observed cardiac defects in exposed fishes. The literature shows PCB & TCDD derived cardiac defects are concurrent with, but not caused by, expression of cyp1A, due to activation of the aryl hydrocarbon receptor (AhR) gene activation pathway. Read More

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Accumulation characteristics and estimated dietary intakes of polychlorinated dibenzo-p-dioxins, polychlorinated dibenzofurans and polychlorinated biphenyls in plant-origin foodstuffs from Chinese markets.

Sci Total Environ 2021 Jun 14;775:145830. Epub 2021 Feb 14.

CAS Key Laboratory of Separation Sciences for Analytical Chemistry, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China. Electronic address:

The levels and accumulation characteristics of polychlorinated dibenzo-p-dioxins and dibenzofurans (PCDD/Fs) and polychlorinated biphenyls (PCBs) were investigated in nine pools of representative plant-origin foodstuffs randomly collected from markets located in five regions of the Chinese mainland during 2018-2019. The collected foodstuffs consisted of cereals, beans, potatoes, leafy vegetables, root and stem vegetables, melon vegetables, legume vegetables, edible fungi, and mixed vegetable oil. In the fresh plant food pools, the concentrations of toxic equivalency (WHO-TEQ) were in the ranges of 0. Read More

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