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https://www.readbyqxmd.com/read/28645054/computational-analysis-of-the-toxcast-estrogen-receptor-agonist-assays-to-predict-vitellogenin-induction-by-chemicals-in-male-fish
#1
David A Dreier, Nancy D Denslow, Christopher J Martyniuk
Endocrine disruptors, especially estrogen receptor (ER) agonists, have received considerable research attention. While there are several mechanistic endpoints for ER agonism in the Endocrine Disruptor Screening Program, there have been growing efforts to develop high-throughput screening assays and computational models to reduce testing cost, time, and animal use. For example, there are 16 ER agonist assays and an integrated computational model in ToxCast. In the present study, we examined the relationship between ToxCast ER agonist assays and model activity to male vitellogenin induction in the Fish-Short Term Reproduction Assay...
June 13, 2017: Environmental Toxicology and Pharmacology
https://www.readbyqxmd.com/read/28637346/an-ion-beam-induced-arabidopsis-mutant-with-marked-chromosomal-rearrangement
#2
Ayako N Sakamoto, Vo Thi Thuong Lan, Satoru Fujimoto, Sachihiro Matsunaga, Atsushi Tanaka
Ion beams have been used as an effective tool in mutation breeding for the creation of crops with novel characteristics. Recent analyses have revealed that ion beams induce large chromosomal alterations, in addition to small mutations comprising base changes or frameshifts. In an effort to understand the potential capability of ion beams, we analyzed an Arabidopsis mutant possessing an abnormal genetic trait. The Arabidopsis mutant uvh3-2 is hypersensitive to UVB radiation when photoreactivation is unavailable...
June 15, 2017: Journal of Radiation Research
https://www.readbyqxmd.com/read/28636615/family-living-sets-the-stage-for-cooperative-breeding-and-ecological-resilience-in-birds
#3
Michael Griesser, Szymon M Drobniak, Shinichi Nakagawa, Carlos A Botero
Cooperative breeding is an extreme form of cooperation that evolved in a range of lineages, including arthropods, fish, birds, and mammals. Although cooperative breeding in birds is widespread and well-studied, the conditions that favored its evolution are still unclear. Based on phylogenetic comparative analyses on 3,005 bird species, we demonstrate here that family living acted as an essential stepping stone in the evolution of cooperative breeding in the vast majority of species. First, families formed by prolonging parent-offspring associations beyond nutritional independency, and second, retained offspring began helping at the nest...
June 2017: PLoS Biology
https://www.readbyqxmd.com/read/28636229/recovery-from-reproductive-and-morphological-abnormalities-in-medaka-oryzias-latipes-following-a-14-day-exposure-to-diclofenac
#4
Hirofumi Yokota, Kaho Higashi, Erina Hanada, Ei Matsuzaki, Yukinari Tsuruda, Tomoko Suzuki, Eiko Nakano, Sayaka Eguchi
Mating pairs of medaka (Oryzias latipes) were exposed to diclofenac (DCF) at measured concentrations of 0 (control), 7.1, 37, and 78 µg/L for 14 d under static-renewal conditions. Effects on reproductive success, as well as morphological abnormalities, of the fish were assessed. During the exposure period, both fecundity and fertility were significantly decreased in the 37 and 78 µg/L treatments groups, and swollen abdomens in females were observed in all exposure groups. Notably, a defect of the lower jaw also was observed in four male fish: two at 37 µg/L, and the others at 78 µg/L of DCF...
June 21, 2017: Environmental Toxicology and Chemistry
https://www.readbyqxmd.com/read/28634424/overexpression-and-knockdown-of-hypoxia-inducible-factor-1-disrupt-the-expression-of-steroidogenic-enzyme-genes-and-early-embryonic-development-in-zebrafish
#5
Tianfeng Tan, Richard Man Kit Yu, Rudolf Shiu Sun Wu, Richard Yuen Chong Kong
Hypoxia is an important environmental stressor leading to endocrine disruption and reproductive impairment in fish. Although the hypoxia-inducible factor 1 (HIF-1) is known to regulate the transcription of various genes mediating oxygen homeostasis, its role in modulating steroidogenesis-related gene expression remains poorly understood. In this study, the regulatory effect of HIF-1 on the expression of 9 steroidogenic enzyme genes was investigated in zebrafish embryos using a "gain-of-function and loss-of-function" approach...
2017: Gene Regulation and Systems Biology
https://www.readbyqxmd.com/read/28631836/medaka-extended-one-generation-reproduction-test-meogrt-evaluating-4-nonylphenol
#6
Haruna Watanabe, Yoshifumi Horie, Hitomi Takanobu, Masaaki Koshio, Taisen Iguchi, Norihisa Tatarazako
The Medaka Extended One-Generation Test (MEOGRT) was developed as a multi-generational toxicity test for chemicals, particularly endocrine disrupting chemicals. Briefly, 3 generations of Japanese medaka (Oryzias latipes) are exposed to a chemical over a 20-week period: 3-week in the parental generation (F0), 15-week in the first generation (F1), and 2-week in the second generation (F2). The present study reports the first MEOGRT results concerning branched isomer mixtures of 4-nonylphenol (NP). Adult F0 medaka exposed to NP at 5 actual concentrations (1...
June 20, 2017: Environmental Toxicology and Chemistry
https://www.readbyqxmd.com/read/28630649/a-complete-duplication-of-x-chromosome-resulting-in-a-tricentric-isochromosome-originated-by-centromere-repositioning
#7
N Villa, D Conconi, D Gambel Benussi, G Tornese, F Crosti, E Sala, L Dalprà, V Pecile
BACKGROUND: Neocentromeres are rare and considered chromosomal aberrations, because a non-centromeric region evolves in an active centromere by mutation. The literature reported several structural anomalies of X chromosome and they influence the female reproductive capacity or are associated to Turner syndrome in the presence of monosomy X cell line. CASE PRESENTATION: We report a case of chromosome X complex rearrangement found in a prenatal diagnosis. The fetal karyotype showed a mosaicism with a 45,X cell line and a 46 chromosomes second line with a big marker, instead of a sex chromosome...
2017: Molecular Cytogenetics
https://www.readbyqxmd.com/read/28628257/contrasting-gene-expression-programs-correspond-with-predator-induced-phenotypic-plasticity-within-and-across-generations-in-daphnia
#8
Nicole R Hales, Drew R Schield, Audra L Andrew, Daren C Card, Matthew R Walsh, Todd A Castoe
Research has shown that a change in environmental conditions can alter the expression of traits during development (i.e., 'within-generation phenotypic plasticity') as well as induce heritable phenotypic responses that persist for multiple generations (i.e., 'transgenerational plasticity'). It has long been assumed that shifts in gene expression are tightly linked to observed trait responses at the phenotypic level. Yet, the manner in which organisms couple within- and trans-generational plasticity at the molecular level is unclear...
June 19, 2017: Molecular Ecology
https://www.readbyqxmd.com/read/28622660/assessing-the-effects-of-the-antidepressant-venlafaxine-to-fathead-minnows-exposed-to-environmentally-relevant-concentrations-over-a-full-life-cycle
#9
Joanne L Parrott, Chris D Metcalfe
Venlafaxine is an antidepressant drug that has been detected in municipal wastewater effluents at low μg/L concentrations. To assess the potential of this compound to affect the survival, development and reproductive capacity of fish, we exposed fathead minnow (Pimephales promelas) over a full lifecycle in a flow-through system to nominal venlafaxine concentrations of 0.88, 8.8, and 88 μg/L. Mean measured venlafaxine concentrations in these treatments were 1.0, 9.3 and 75 μg/L. During the 167-168 d exposure, no significant changes were observed in survival, or the weights and lengths of fathead minnows...
June 13, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/28621416/all-in-one-integrating-cell-polarity-meiosis-mitosis-and-mechanical-forces-in-early-oocyte-differentiation-in-vertebrates
#10
Yaniv M Elkouby
While the differentiation of oocytes is key for embryonic development, and its investigation is crucial for advancing our understanding of human reproduction and fertility, many fundamental questions in oogenesis have been long standing. However, recent technical advances have led to several breakthroughs mainly in mice and zebrafish. Here I review these recent findings, including regulation and organization of the germline cyst, the mechanistics of chromosomal pairing, establishment of cell polarity, and formation of a universal mRNA-protein (mRNP) granule called the Balbiani body...
2017: International Journal of Developmental Biology
https://www.readbyqxmd.com/read/28611209/the-highly-overlapping-actions-of-lh-signaling-and-fsh-signaling-on-zebrafish-spermatogenesis
#11
Yuxin Xie, Lianhe Chu, Yun Liu, Kathy W Y Sham, Jianzhen Li, Christopher H K Cheng
Gonadotropin signaling plays a pivotal role in the spermatogenesis of vertebrates, but how gonadotropins regulate the process in non-mammalian species remains elusive. Using a gene knockout approach in zebrafish, we have previously demonstrated the non-canonical action of gonadotropin signaling on spermatogenesis by analyzing four single mutant lines (lhb, lhr, fshb and fshr) and three double mutant lines (lhb;fshb, lhr;fshr and fshb;lhr). In this study, we further investigated the actions of gonadotropins on the testis by establishing three other double mutant zebrafish lines (lhb;lhr, fshb;fshr and lhb;fshr)...
June 13, 2017: Journal of Endocrinology
https://www.readbyqxmd.com/read/28602910/in-vitro-screening-for-estrogenic-endocrine-disrupting-compounds-using-mozambique-tilapia-and-sea-bass-scales
#12
Patrícia I S Pinto, M Dulce Estêvão, Soraia Santos, André Andrade, Deborah M Power
A wide range of estrogenic endocrine disruptors (EDCs) are accumulating in the environment and may disrupt the physiology of aquatic organisms. The effects of EDCs on fish have mainly been assessed using reproductive endpoints and in vivo animal experiments. We used a simple non-invasive assay to evaluate the impact of estrogens and EDCs on sea bass (Dicentrarchus labrax) and tilapia (Oreochromis mossambicus) scales. These were exposed to estradiol (E2), two phytoestrogens and six anthropogenic estrogenic/anti-estrogenic EDCs and activities of enzymes related to mineralized tissue turnover (TRAP, tartrate-resistant acid phosphatase and ALP, alkaline phosphatase) were measured...
June 8, 2017: Comparative Biochemistry and Physiology. Toxicology & Pharmacology: CBP
https://www.readbyqxmd.com/read/28602421/endocrine-disruption-effects-in-male-and-intersex-roach-rutilus-rutilus-l-from-french-rivers-an-integrative-approach-based-on-subcellular-to-individual-responses
#13
Perrine Geraudie, Marie Gerbron, Christophe Minier
Among the chemicals found in the aquatic environment, some have been reported to interact with the endocrine system of organisms and have been identified as endocrine disrupting compounds. In this study, we have assessed the biological effects due to environmental estrogenic compounds in adult male roach (Rutilus rutilus). Wild fish were collected in the Seine river, and one of its affluent, the Epte river in Normandy, France and impacts on endocrine and reproductive functions have been assessed. This study provides innovative data on the intersex condition in wild fish that are crucial to understand estrogenic contamination impacts and maintenance of sustainable fish population...
June 5, 2017: Comparative Biochemistry and Physiology. Part B, Biochemistry & Molecular Biology
https://www.readbyqxmd.com/read/28601762/warming-modulates-the-effects-of-the-endocrine-disruptor-progestin-levonorgestrel-on-the-zebrafish-fitness-ovary-maturation-kinetics-and-reproduction-success
#14
P G Cardoso, D Rodrigues, T V Madureira, N Oliveira, M J Rocha, E Rocha
Interactive effects between multiple stressors, namely climate drivers (e.g., temperature) and chemical pollution (e.g., endocrine disruptors) are poorly studied. Here, it was for the first time evaluated the combinatory effects of temperature and a synthetic progestin, levonorgestrel (LNG), on the fitness and reproductive-related endpoints of zebrafish (Danio rerio). A multi-factorial design was implemented by manipulating both temperature [setting as baseline an ambient temperature of 27 °C, against warming (+3 °C)] and LNG levels (10 ngL(-1) and 1000 ngL(-1))...
June 8, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/28601516/exposure-to-e2-and-ee2-environmental-concentrations-affect-different-components-of-the-brain-pituitary-gonadal-axis-in-pejerrey-fish-odontesthes-bonariensis
#15
Ángela Gárriz, Pamela S Del Fresno, Leandro A Miranda
The present study focuses on the effects of E2 and EE2 environmental concentrations on different components of the reproductive axis of pejerrey (Odontesthes bonariensis), a native fish species from Pampas lakes of Argentina. The results obtained demonstrated that E2 and EE2 separate or mixed, could disrupt key pathways of the pejerrey Brain-Pituitary-Gonadal axis. First, it was observed that at the brain level, gnrh-III and cyp19a1b mRNA expression increased significantly in the exposed fish. Secondly, in the pituitary fshb and lhb mRNA expression levels, the study did not show any differences between treated and control groups...
June 8, 2017: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/28601145/ovarian-development-and-the-reproductive-profile-of-astyanax-altiparanae-teleostei-characidae-over-one-year-applications-in-fish-farming
#16
Mônica Cassel, Chayrra Chehade, Giovana Souza Branco, Danilo Caneppele, Elizabeth Romagosa, Maria Inês Borella
Astyanax altiparanae is a Brazilian species of substantial commercial, environmental and scientific importance; however, existing studies on its reproduction do not seem to provide enough details. In light of the increasing use of this species in fish farming and the need for basic studies for the development of new production technologies, we describe the structural and ultrastructural characteristics of the ovaries of A. altiparanae, and characterize the species' reproductive cycle. Females were collected monthly from March 2013 to February 2014, and reproductive management began in October 2013...
August 2017: Theriogenology
https://www.readbyqxmd.com/read/28600501/hatching-enzymes-disrupt-aberrant-gonadal-degeneration-by-the-autophagy-apoptosis-cell-fate-decision
#17
Tapas Chakraborty, Sipra Mohapatra, Megumi Tobayama, Kayoko Ohta, Yong-Woon Ryu, Yukinori Kazeto, Kohei Ohta, Linyan Zhou, Yoshitaka Nagahama, Takahiro Matsubara
Environmental stressors, gonadal degenerative diseases and tumour development can significantly alter the oocyte physiology, and species fertility and fitness. To expand the molecular understanding about oocyte degradation, we isolated several spliced variants of Japanese anchovy hatching enzymes (AcHEs; ovastacin homologue) 1 and 2, and analysed their potential in oocyte sustenance. Particularly, AcHE1b, an ovary-specific, steroid-regulated, methylation-dependent, stress-responsive isoform, was neofunctionalized to regulate autophagic oocyte degeneration...
June 9, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28599206/mercury-flow-through-an-asian-rice-based-food-web
#18
Kasun S Abeysinghe, Guangle Qiu, Eben Goodale, Christopher W N Anderson, Kevin Bishop, David C Evers, Morgan W Goodale, Holger Hintelmann, Shengjie Liu, Christos Mammides, Rui-Chang Quan, Jin Wang, Pianpian Wu, Xiao-Hang Xu, Xiao-Dong Yang, Xinbin Feng
Mercury (Hg) is a globally-distributed pollutant, toxic to humans and animals. Emissions are particularly high in Asia, and the source of exposure for humans there may also be different from other regions, including rice as well as fish consumption, particularly in contaminated areas. Yet the threats Asian wildlife face in rice-based ecosystems are as yet unclear. We sought to understand how Hg flows through rice-based food webs in historic mining and non-mining regions of Guizhou, China. We measured total Hg (THg) and methylmercury (MeHg) in soil, rice, 38 animal species (27 for MeHg) spanning multiple trophic levels, and examined the relationship between stable isotopes and Hg concentrations...
June 6, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/28599128/acute-and-chronic-sensitivity-to-copper-of-a-promising-ecotoxicological-model-species-the-annual-killifish-nothobranchius-furzeri
#19
Charlotte Philippe, Arnout F Grégoir, Lizanne Janssens, Tom Pinceel, Gudrun De Boeck, Luc Brendonck
Nothobranchius furzeri is a promising model for ecotoxicological research due to the species' short life cycle and the production of drought-resistant eggs. Although the species is an emerging vertebrate fish model for several fundamental as well as applied research domains, its potential for ecotoxicological research has not yet been tested. The aim of this study was to characterise the acute and chronic sensitivity of this species to copper as compared to other model organisms. Effects of both acute and chronic copper exposure were tested on survival, life history and physiological traits...
June 6, 2017: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/28597390/effects-of-nanoparticles-in-species-of-aquaculture-interest
#20
Kheyrollah Khosravi-Katuli, Ermelinda Prato, Giusy Lofrano, Marco Guida, Gonçalo Vale, Giovanni Libralato
Recently, it was observed that there is an increasing application of nanoparticles (NPs) in aquaculture. Manufacturers are trying to use nano-based tools to remove the barriers about waterborne food, growth, reproduction, and culturing of species, their health, and water treatment in order to increase aquaculture production rates, being the safe-by-design approach still unapplied. We reviewed the applications of NPs in aquaculture evidencing that the way NPs are applied can be very different: some are direclty added to feed, other to water media or in aquaculture facilities...
June 9, 2017: Environmental Science and Pollution Research International
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