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environmental endocrine disturber

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https://www.readbyqxmd.com/read/28431277/endocrine-disruption-by-environmental-gestagens-in-amphibians-a-short-review-supported-by-new-in%C3%A2-vitro-data-using-gonads-of-xenopus-laevis
#1
REVIEW
Andrea Ziková, Claudia Lorenz, Frauke Hoffmann, Wibke Kleiner, Ilka Lutz, Matthias Stöck, Werner Kloas
Endocrine disruption caused by various anthropogenic compounds is of persisting concern, especially for aquatic wildlife, because surface waters are the main sink of these so-called endocrine disruptors (ED). In the past, research focused on (anti)estrogenic, (anti)androgenic, and (anti)thyroidal substances, affecting primarily reproduction and development in vertebrates; however, other endocrine systems might be also targeted by ED. Environmental gestagens, including natural progestogens (e.g. progesterone (P4)) and synthetic progestins used for contraception, are supposed to affect vertebrate reproduction via progesterone receptors...
April 5, 2017: Chemosphere
https://www.readbyqxmd.com/read/28369636/maternal-fenvalerate-exposure-induces-fetal-intrauterine-growth-restriction-through-disrupting-placental-thyroid-hormone-receptor-signaling
#2
Bo Wang, Ji-Jie Liu, Yan Wang, Lin Fu, Ru Shen, Zhen Yu, Hua Wang, Yuan-Hua Chen, Cheng Zhang, Xiu-Hong Meng, De-Xiang Xu
Fenvalerate is an environmental endocrine disruptor that disrupts testosterone and estradiol synthesis. Nevertheless, whether fenvalerate disturbs placental TR signaling remains unclear. The aim of this study was to investigate whether maternal fenvalerate exposure causes fetal intrauterine growth restriction (IUGR) and to explore the role of placental thyroid hormone receptor (TR) signaling. Pregnant mice except controls were orally administered to fenvalerate (0.2, 2.0 or 20 mg/kg) daily throughout pregnancy...
March 23, 2017: Toxicological Sciences: An Official Journal of the Society of Toxicology
https://www.readbyqxmd.com/read/28065941/di2-ethylhexyl-phthalate-disrupts-thyroid-hormone-homeostasis-through-activating-the-ras-akt-trhr-pathway-and-inducing-hepatic-enzymes
#3
Hanfeng Ye, Mei Ha, Min Yang, Ping Yue, Zhengyuan Xie, Changjiang Liu
Di(2-ethylhexyl) phthalate (DEHP), as a widespread environmental pollutant and an endocrine disruptor, can disturb the homeostasis of thyroid hormones (THs). In order to elucidate roles of the MAPK and PI3K/Akt pathways and hepatic enzymes in thyroid-disrupting effects of DEHP, Sprague-Dawley rats were dosed with DEHP by gavage for 30 consecutive days; Nthy-ori 3-1 cells were treated with DEHP with NAC, k-Ras siRNA or inhibitors (U0126 and wortmannin). Results showed that DEHP led to histopathologic changes in rat thyroid and liver, such as the decrease in thyroid follicular cavity diameter, hepatocyte edema...
January 9, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28031325/diethylstilbestrol-activates-catsper-and-disturbs-progesterone-actions-in-human-spermatozoa
#4
Qian-Xing Zou, Zhen Peng, Qing Zhao, Hou-Yang Chen, Yi-Min Cheng, Qing Liu, Yuan-Qiao He, Shi-Qi Weng, Hua-Feng Wang, Tao Wang, Li-Ping Zheng, Tao Luo
STUDY QUESTION: Is diethylstilbestrol (DES), a prototypical endocrine-disrupting chemical (EDC), able to induce physiological changes in human spermatozoa and affect progesterone actions? SUMMARY ANSWER: DES promoted Ca(2+) flux into human spermatozoa by activating the cation channel of sperm (CatSper) and suppressed progesterone-induced Ca(2+) signaling, tyrosine phosphorylation and sperm functions. WHAT IS KNOWN ALREADY: DES significantly impairs the male reproductive system both in fetal and postnatal exposure...
December 28, 2016: Human Reproduction
https://www.readbyqxmd.com/read/27933203/maternal-inflammatory-bowel-disease-and-hypospadias-in-male-offspring-a-population-based-study-in-denmark
#5
Ane Birgitte Telén Andersen, Vera Ehrenstein, Rune Erichsen, Trine Frøslev, Henrik Toft Sørensen
BACKGROUND: The occurrence of inflammatory bowel disease (IBD) and hypospadias has been concurrently increasing, possibly through shared environmental risk factors such as endocrine disrupting compounds. Also, maternal IBD may disturb the normal development of the fetal reproductive tract. However, whether maternal IBD increases the risk of hypospadias in male offspring is unknown. We compared hypospadias risk in sons of mothers with and without IBD. METHODS: We used Danish nationwide population-based registries to conduct a longitudinal prevalence study including all live-born boys from 1979 through 2009...
2016: BMJ Open Gastroenterology
https://www.readbyqxmd.com/read/27866739/an-integrated-approach-for-identifying-priority-contaminant-in-the-great-lakes-basin-investigations-in-the-lower-green-bay-fox-river-and-milwaukee-estuary-areas-of-concern
#6
Shibin Li, Daniel L Villeneuve, Jason P Berninger, Brett R Blackwell, Jenna E Cavallin, Megan N Hughes, Kathleen M Jensen, Zachary Jorgenson, Michael D Kahl, Anthony L Schroeder, Kyle E Stevens, Linnea M Thomas, Matthew A Weberg, Gerald T Ankley
Environmental assessment of complex mixtures typically requires integration of chemical and biological measurements. This study demonstrates the use of a combination of instrumental chemical analyses, effects-based monitoring, and bio-effects prediction approaches to help identify potential hazards and priority contaminants in two Great Lakes Areas of Concern (AOCs), the Lower Green Bay/Fox River located near Green Bay, WI, USA and the Milwaukee Estuary, located near Milwaukee, WI, USA. Fathead minnows were caged at four sites within each AOC (eight sites total)...
February 1, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/27776203/obesogens-and-male-fertility
#7
REVIEW
A M Cardoso, M G Alves, P P Mathur, P F Oliveira, J E Cavaco, L Rato
In the last decades, several studies evidenced a decrease in male fertility in developed countries. Although the aetiology of this trend in male reproductive health remains a matter of debate, environmental compounds that predispose to weight gain, namely obesogens, are appointed as contributors because of their action as endocrine disruptors. Obesogens favour adipogenesis by an imbalance of metabolic processes and can be found virtually everywhere. These compounds easily accumulate in tissues with high lipid content...
January 2017: Obesity Reviews: An Official Journal of the International Association for the Study of Obesity
https://www.readbyqxmd.com/read/27662217/adaptive-pid-control-based-on-orthogonal-endocrine-neural-networks
#8
Miroslav B Milovanović, Dragan S Antić, Marko T Milojković, Saša S Nikolić, Staniša Lj Perić, Miodrag D Spasić
A new intelligent hybrid structure used for online tuning of a PID controller is proposed in this paper. The structure is based on two adaptive neural networks, both with built-in Chebyshev orthogonal polynomials. First substructure network is a regular orthogonal neural network with implemented artificial endocrine factor (OENN), in the form of environmental stimuli, to its weights. It is used for approximation of control signals and for processing system deviation/disturbance signals which are introduced in the form of environmental stimuli...
December 2016: Neural Networks: the Official Journal of the International Neural Network Society
https://www.readbyqxmd.com/read/27639922/obesity-type-1-diabetes-and-psoriasis-an-autoimmune-triple-flip
#9
REVIEW
Mariagrazia Granata, Evangelia Skarmoutsou, Chiara Trovato, Giulio A Rossi, Maria Clorinda Mazzarino, Fabio D'Amico
Obesity, type 1 diabetes, and psoriasis are wide-ranging health problems. Genetics, epigenetics, and environmental factors together with immune disturbances are involved in these diseases. The white adipose tissue is an active endocrine organ, secreting a wide variety of soluble mediators called adipokines that have a central role in the relationship between adipose tissue and immune system. Inflammatory cytokines, including the IL-23/IL-17 and IL-18 axes, and microRNAs are involved in many processes, including immunity and inflammation, thus having a major role in the onset of these three diseases...
2017: Pathobiology: Journal of Immunopathology, Molecular and Cellular Biology
https://www.readbyqxmd.com/read/27611220/impairment-of-reproduction-of-adult-zebrafish-danio-rerio-by-binary-mixtures-of-environmentally-relevant-concentrations-of-triclocarban-and-inorganic-mercury
#10
Pingping Wang, Zhongkun Du, Shixiang Gao, Xiaowei Zhang, J P Giesy
Effects of chemical mixtures at environmentally relevant concentrations on endocrine systems of aquatic organisms are of concern. Triclocarban (TCC) and inorganic mercury (Hg(2+)) are ubiquitous in aquatic environments, and are known to interfere with endocrine pathways via different mechanisms of toxic action. However, effects of mixtures of the two pollutants on aquatic organisms and associated molecular mechanisms were unknown. This study examined effects of binary mixtures of TCC and Hg(2+) on histopathological and biochemical alteration of reproductive organs in zebrafish (Danio rerio) after 21 d exposure...
September 6, 2016: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/27546318/phthalates-widespread-occurrence-and-the-effect-on-male-gametes-part-2-the-effects-of-phthalates-on-male-gametes-and-on-the-offspring
#11
Małgorzata M Dobrzyńska
UNLABELLED: The general exposure to endocrine disruptors, including phthalates, is considered as one of the reason diminished sperm count and deteriorated sperm quality, which may lead to infertility and higher incidence of congenital malformations of the genital tract. This article describes the effects of selected phthalates di(2-ethylhexyl)phthalate (DEHP), dibutyl phthalate (DBP); butylbenzyl phthalate (BBP), diethyl phthalate (DEP), di-isononyl phthalate (DINP) on the male gametes, reproduction and the offspring of exposed animals...
2016: Roczniki Państwowego Zakładu Higieny
https://www.readbyqxmd.com/read/27501186/the-circadian-timing-system-and-environmental-circadian-disruption-from-follicles-to-fertility
#12
Aritro Sen, Michael T Sellix
The internal or circadian timing system is deeply integrated in female reproductive physiology. Considerable details of rheostatic timing function in the neuroendocrine control of pituitary hormone secretion, adenohypophyseal hormone gene expression and secretion, gonadal steroid hormone biosynthesis and secretion, ovulation, implantation, and parturition have been reported. The molecular clock, an autonomous feedback loop oscillator of interacting transcriptional regulators, dictates the timing and amplitude of gene expression in each tissue of the female hypothalamic-pituitary-gonadal (HPG) axis...
September 2016: Endocrinology
https://www.readbyqxmd.com/read/27459109/endocrine-and-cardiovascular-rhythms-differentially-adapt-to-chronic-phase-delay-shifts-in-rats
#13
Michal Zeman, Lubos Molcan, Iveta Herichova, Monika Okuliarova
Disturbances in regular circadian oscillations can have negative effects on cardiovascular function, but epidemiological data are inconclusive and new data from animal experiments elucidating critical biological mechanisms are needed. To evaluate the consequences of chronic phase shifts of the light/dark (LD) cycle on hormonal and cardiovascular rhythms, two experiments were performed. In Experiment 1, male rats were exposed to either a regular 12:12 LD cycle (CONT) or rotating 8-h phase-delay shifts of LD every second day (SHIFT) for 10 weeks...
2016: Chronobiology International
https://www.readbyqxmd.com/read/27153234/metabolic-and-immune-impairments-induced-by-the-endocrine-disruptors-benzo-a-pyrene-and-triclosan-in-xenopus-tropicalis
#14
Christophe Regnault, John Willison, Sylvie Veyrenc, Antinéa Airieau, Patrick Méresse, Marlène Fortier, Michel Fournier, Pauline Brousseau, Muriel Raveton, Stéphane Reynaud
Despite numerous studies suggesting that amphibians are highly sensitive to cumulative anthropogenic stresses, the role played by endocrine disruptors (EDs) in the decline of amphibian populations remains unclear. EDs have been extensively studied in adult amphibians for their capacity to disturb reproduction by interfering with the sexual hormone axis. Here, we studied the in vivo responses of Xenopus tropicalis males exposed to environmentally relevant concentrations of each ED, benzo[a]pyrene (BaP) and triclosan (TCS) alone (10 μg L(-1)) or a mixture of the two (10 μg L(-1) each) over a 24 h exposure period by following the modulation of the transcription of key genes involved in metabolic, sexual and immunity processes and the cellular changes in liver, spleen and testis...
July 2016: Chemosphere
https://www.readbyqxmd.com/read/27108204/effects-of-chlordecone-on-20-hydroxyecdysone-concentration-and-chitobiase-activity-in-a-decapod-crustacean-macrobrachium-rosenbergii
#15
Anne Lafontaine, Eric Gismondi, Céline Boulangé-Lecomte, Perrine Geraudie, Nathalie Dodet, Fanny Caupos, Soazig Lemoine, Laurent Lagadic, Jean-Pierre Thomé, Joëlle Forget-Leray
Chlordecone (CLD) is an organochlorine insecticide abundant in aquatic environment of the French West Indies. However, few studies have investigated its impact on freshwater invertebrates. Whereas CLD is suspected of inducing endocrine disruption, this work aimed to study the effects of environmentally relevant concentrations of CLD on the 20-hydroxyecdysone (20-HE) hormone concentration and on the chitobiase activity, both having key roles in the molting process of crustaceans. In addition, the bioaccumulation of CLD was measured in the muscle tissue of Macrobrachium rosenbergii to underline potential dose-response relationship...
July 2016: Aquatic Toxicology
https://www.readbyqxmd.com/read/27092574/endocrine-disruption-throughout-the-hypothalamus-pituitary-gonadal-liver-hpgl-axis-in-marine-medaka-oryzias-melastigma-chronically-exposed-to-the-antifouling-and-chemopreventive-agent-3-3-diindolylmethane-dim
#16
Lianguo Chen, Rui Ye, Weipeng Zhang, Chenyan Hu, Bingsheng Zhou, Drew R Peterson, Doris W T Au, Paul K S Lam, Pei-Yuan Qian
Despite being proposed as a promising antifouling and chemopreventive agent, the environmental risks of 3,3'-diindolylmethane (DIM) are scarcely investigated. Therefore, this study used adult marine medaka (Oryzias melastigma) as a model organism to examine the toxicological effects and underlying mechanism of DIM throughout the hypothalamus-pituitary-gonadal-liver (HPGL) axis following 28 days of exposure to low DIM concentrations (0 and 8.46 μg/L). The results showed that altered gene transcription in the hypothalamus, pituitary, and gonads contributed to the great imbalance in hormone homeostasis...
June 20, 2016: Chemical Research in Toxicology
https://www.readbyqxmd.com/read/27089421/uv-filters-induce-transcriptional-changes-of-different-hormonal-receptors-in-chironomus-riparius-embryos-and-larvae
#17
Irene Ozáez, Mónica Aquilino, Gloria Morcillo, José-Luis Martínez-Guitarte
Organic ultraviolet (UV) filters are emerging contaminants that are ubiquitous in fresh and marine aquatic systems due to their extensive use in cosmetics, plastics, paints, textiles, and many other industrial products. The estrogenic effects of organic UV filters have been long demonstrated in vertebrates, and other hormonal activities may be altered, according to more recent reports. The impact of UV filters on the endocrine system of invertebrates is largely unknown. We have previously reported that some UV filters may affect ecdysone-related genes in the aquatic insect Chironomus riparius, an ecotoxicologically important model organism...
July 2016: Environmental Pollution
https://www.readbyqxmd.com/read/27088622/oxidative-stress-and-immune-disturbance-after-long-term-exposure-to-bisphenol-a-in-juvenile-common-carp-cyprinus-carpio
#18
Wenhui Qiu, Jingsi Chen, Yijie Li, Zhong Chen, Lihui Jiang, Ming Yang, Minghong Wu
Bisphenol A (BPA) is a well-known endocrine disrupting chemical (EDC), ubiquitous in the aquatic environment, which poses an ecotoxicological risk to the health of aquatic organisms. However, the immunotoxic effects of its long-term exposure on fish have received limited attention. We examined a number of typical immune-related parameters and oxidative stress indices in the liver and blood serum of the red common carp (Cyprinus carpio), following a 30-day exposure to five different concentrations of BPA (0...
August 2016: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/26817483/chronic-inflammatory-systemic-diseases-an-evolutionary-trade-off-between-acutely-beneficial-but-chronically-harmful-programs
#19
REVIEW
Rainer H Straub, Carsten Schradin
It has been recognized that during chronic inflammatory systemic diseases (CIDs) maladaptations of the immune, nervous, endocrine and reproductive system occur. Maladaptation leads to disease sequelae in CIDs. The ultimate reason of disease sequelae in CIDs remained unclear because clinicians do not consider bodily energy trade-offs and evolutionary medicine. We review the evolution of physiological supersystems, fitness consequences of genes involved in CIDs during different life-history stages, environmental factors of CIDs, energy trade-offs during inflammatory episodes and the non-specificity of CIDs...
January 27, 2016: Evolution, Medicine, and Public Health
https://www.readbyqxmd.com/read/26781251/bisphenol-a-hypertension-and-cardiovascular-diseases-epidemiological-laboratory-and-clinical-trial-evidence
#20
REVIEW
Changwoo Han, Yun-Chul Hong
Bisphenol A (BPA) exposure has become one of the most common environmental chemical exposures in humans. There is growing evidence regarding an association between BPA exposure, hypertension, and cardiovascular diseases (CVD). If BPA exposure is indeed associated with raised blood pressure and CVD, it would be a major public health problem. Therefore, we reviewed the epidemiological, laboratory, and clinical trial evidence for an association between BPA exposure, CVD, and hypertension, and discussed the possible mechanisms in this article...
February 2016: Current Hypertension Reports
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