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Aquatic Toxicology

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https://www.readbyqxmd.com/read/28535436/microcystin-lr-induces-changes-in-the-gaba-neurotransmitter-system-of-zebrafish
#1
Wei Yan, Li Li, Guangyu Li, Sujuan Zhao
It has been reported that exposure to microcystins altered adult zebrafish swimming performance parameters, but the possible mechanisms of action remain unknown. Neuronal activity depends on the balance between the number of excitatory and inhibitory processes which are associated with neurotransmitters. In the present study, zebrafish embryos (5 d post-fertilization) were exposed to 0, 0.3, 3 and 30μg/L (microcystin-LR) MCLR for 90day until reaching sexual maturity. To investigate the effects of MCLR on the neurotransmitter system, mRNA levels involved in amino acid g-aminobutyric acid (GABA) and glutamate metabolic pathways were tested using quantitative real-time PCR...
May 15, 2017: Aquatic Toxicology
https://www.readbyqxmd.com/read/28528318/metabolic-profiling-of-goldfish-carassius-auratis-after-long-term-glyphosate-based-herbicide-exposure
#2
Ming-Hui Li, Ling-Yu Ruan, Jin-Wei Zhou, Yong-Hong Fu, Lei Jiang, He Zhao, Jun-Song Wang
Glyphosate is an efficient herbicide widely used worldwide. However, its toxicity to non-targeted organisms has not been fully elucidated. In this study, the toxicity of glyphosate-based herbicide was evaluated on goldfish (Carassius auratus) after long-term exposure. Tissues of brains, kidneys and livers were collected and submitted to NMR-based metabolomics analysis and histopathological inspection. Plasma was collected and the blood biochemical indexes of AST, ALT, BUN, CRE, LDH, SOD, GSH-Px, GR and MDA were measured...
May 13, 2017: Aquatic Toxicology
https://www.readbyqxmd.com/read/28527383/tributyltin-and-triphenyltin-exposure-promotes-in-vitro-adipogenic-differentiation-but-alters-the-adipocyte-phenotype-in-rainbow-trout
#3
Esmail Lutfi, Natàlia Riera-Heredia, Marlon Córdoba, Cinta Porte, Joaquim Gutiérrez, Encarnación Capilla, Isabel Navarro
Numerous environmental pollutants have been identified as potential obesogenic compounds affecting endocrine signaling and lipid homeostasis. Among them, well-known organotins such as tributyltin (TBT) and triphenyltin (TPT), can be found in significant concentrations in aquatic environments. The aim of the present study was to investigate in vitro the effects of TBT and TPT on the development and lipid metabolism of rainbow trout (Onchorynchus mykiss) primary cultured adipocytes. Results showed that TBT and TPT induced lipid accumulation and slightly enhanced peroxisome proliferator-activated receptor gamma (PPARγ) and CCAAT enhancer binding protein alpha (C/EBPα) protein expression when compared to a control, both in the presence or absence of lipid mixture...
May 8, 2017: Aquatic Toxicology
https://www.readbyqxmd.com/read/28500903/microcystin-lr-bioconcentration-induces-antioxidant-responses-in-the-digestive-gland-of-two-marine-bivalves-crassostrea-gigas-and-mytilus-edulis
#4
Young Dae Kim, Won Jin Kim, Yun Kyung Shin, Do-Hee Lee, Youn-Jung Kim, Jang Kyun Kim, Jae-Sung Rhee
Microcystins (MCs) are a major group of potent cyanobacterial toxins found in freshwater and even brackish waterbodies. To understand the putative correlation between bioconcentration of MCs and antioxidant responses of the digestive gland of bivalves, Pacific oyster Crassostrea gigas and blue mussel Mytilus edulis were exposed to different concentrations (0.1, 1, 10 and 20μgL(-1)) of MC-Leucine-Arginine (LR) for seven days. MC-LR bioconcentrated in the digestive glands of both bivalves during exposure period...
May 8, 2017: Aquatic Toxicology
https://www.readbyqxmd.com/read/28521150/the-effects-of-copper-oxide-nanoparticles-on-dorsoventral-patterning-convergent-extension-and-neural-and-cardiac-development-of-zebrafish
#5
Jia Xu, Qiuping Zhang, Xu Li, Sihui Zhan, Lifeng Wang, Dongyan Chen
Currently, nanoparticles are widely used in biomedicine and industry. CuO nanoparticles (CuO-NPs) are versatile materials in our daily life and their toxicity has drawn extensive attention. In this study, we concentrate on the effect of CuO-NPs on early zebrafish development. The results reveal that CuO-NPs can induce abnormal phenotypes of a smaller head and eyes and delayed epiboly. The gene expression pattern shows that CuO-NPs spatially narrow the expression of dorsal genes chordin and goosecoid and alter the expression of dlx3, ntl and hgg which are related to the cell migration of gastrulation...
May 4, 2017: Aquatic Toxicology
https://www.readbyqxmd.com/read/28521151/intracellular-localization-and-toxicity-of-graphene-oxide-and-reduced-graphene-oxide-nanoplatelets-to-mussel-hemocytes-in-vitro
#6
Alberto Katsumiti, Radmila Tomovska, Miren P Cajaraville
Recently, graphene materials have attracted tremendous research interest due to their unique physicochemical properties that hold great promise in electronics, energy, materials and biomedical areas. Graphene oxide (GO) is one of the most extensively studied graphene derivatives. In order to improve GO electrical properties, nanoplatelets are chemically reduced, thus increasing nanoplatelet conductivity. This reduced GO (rGO) shows different properties and behavior compared to GO. Graphene-based wastes are expected to end up in the marine environment...
April 28, 2017: Aquatic Toxicology
https://www.readbyqxmd.com/read/28482328/green-synthesized-cds-nano-pesticides-toxicity-on-young-instars-of-malaria-vectors-and-impact-on-enzymatic-activities-of-the-non-target-mud-crab-scylla-serrata
#7
Vasu Sujitha, Kadarkarai Murugan, Devakumar Dinesh, Amuthvalli Pandiyan, Rajasekar Aruliah, Jiang-Shiou Hwang, Kandasamy Kalimuthu, Chellasamy Panneerselvam, Akon Higuchi, Al Thabiani Aziz, Suresh Kumar, Abdullah A Alarfaj, Baskaralingam Vaseeharan, Angelo Canale, Giovanni Benelli
Currently, nano-formulated mosquito larvicides have been widely proposed to control young instars of malaria vector populations. However, the fate of nanoparticles in the aquatic environment is scarcely known, with special reference to the impact of nanoparticles on enzymatic activity of non-target aquatic invertebrates. In this study, we synthesized CdS nanoparticles using a green protocol relying on the cheap extract of Valoniopsis pachynema algae. CdS nanoparticles showed high toxicity on young instars of the malaria vectors Anopheles stephensi and A...
April 25, 2017: Aquatic Toxicology
https://www.readbyqxmd.com/read/28458151/immunosuppressive-effects-and-associated-compensatory-responses-in-zebrafish-after-full-life-cycle-exposure-to-environmentally-relevant-concentrations-of-cadmium
#8
Sai-Nan Guo, Jia-Lang Zheng, Shuang-Shuang Yuan, Qing-Ling Zhu, Chang-Wen Wu
In natural environments, fish survive in polluted water by cadmium (Cd) throughout their whole life cycle. However, little information is available on Cd toxicity considering a life cycle assessment. The present study investigated effects of environmental levels of cadmium (0, 2.5, and 5μg/L) on immune responses in liver and spleen of zebrafish for 15 weeks, from embryos to sexually maturity. Nitric oxide (NO) levels and iNOS activity declined in liver and spleen of zebrafish exposed to 5μg/L Cd, suggesting an immunosuppressive effect...
April 22, 2017: Aquatic Toxicology
https://www.readbyqxmd.com/read/28456064/effects-of-diclofenac-on-the-expression-of-nrf2-and-its-downstream-target-genes-in-mosquito-fish-gambusia-affinis
#9
Shuang Bao, Xiangping Nie, Ruikang Ou, Chao Wang, Peijia Ku, Kaibing Li
Diclofenac (DCF) is one of widely used non-steroidal anti-inflammatory drugs. Recently, this drug has been universally detected in aquatic environment. However, its potential adverse effects and oxidative stress toxic mechanisms on fish remain unclear. In the present study, we first cloned the crucial partial sequences of some key oxidative stress related genes, which include NF-E2-related factor 2 (Nrf2), NAD(P)H: quinoneoxidoreductase (NQO1), glutamate-cysteine ligase catalytic subunit (GCLC), Cu-Zn superoxide dismutase (SOD2), catalase (CAT), alpha-glutathione S-transferase (GSTA), and UDP-glucuronosyltransferases (UGT) in mosquito fish (Gambusia affinis)...
April 20, 2017: Aquatic Toxicology
https://www.readbyqxmd.com/read/28475951/characterization-of-cadmium-transport-in-hepatopancreatic-cells-of-a-mangrove-crab-ucides-cordatus-the-role-of-calcium
#10
Priscila Ortega, Marcio R Custódio, Flavia P Zanotto
Cadmium is a toxic metal, present in batteries and discarded in estuaries and mangrove habitats. Apart from that, it is a non-essential metal that causes toxic effects in many organisms. Cadmium accumulates in gills and hepatopancreas of crustaceans and its route into the cell is unknown. It is possible that occurs by calcium channels or calcium transporters. The objective of this study was to characterize the transport of cadmium and the role of calcium in different cell types from hepatopancreas of the mangrove crab Ucides cordatus...
April 19, 2017: Aquatic Toxicology
https://www.readbyqxmd.com/read/28472730/modifications-of-the-soluble-proteome-of-a-mediterranean-strain-of-the-invasive-neurotoxic-dinoflagellate-alexandrium-catenella-under-metal-stress-conditions
#11
Natacha Jean, Estelle Dumont, Faouzi Herzi, Thierry Balliau, Mohamed Laabir, Estelle Masseret, Stéphane Mounier
The soluble proteome of the mediterranean strain ACT03 of the invasive neurotoxic dinoflagellate Alexandrium catenella exposed to lead or zinc at 6, 12 or 18μM (total concentrations), or under control conditions, was characterized by two-dimensional gel electrophoresis (2-DE). Zinc reduced (P<0.05) the total number of protein spots (-41%, -52% and -60%, at 6, 12 or 18μM, respectively). Besides, most of the proteins constituting the soluble proteome were down-regulated in response to lead or zinc stresses...
April 19, 2017: Aquatic Toxicology
https://www.readbyqxmd.com/read/28460306/acute-toxicity-and-esterase-response-to-carbaryl-exposure-in-two-different-populations-of-amphipods-hyalella-curvispina
#12
Olga Liliana Anguiano, Melina Vacca, María Emilia Rodriguez Araujo, Mónica Montagna, Andrés Venturino, Ana Ferrari
During the last years, a carbaryl insecticide was extensively applied in the valley of Río Negro and Neuquén, North Patagonia Argentina, to manage codling moths (Cydia pomonella), the main pest of pear and apple trees. In this study carbaryl susceptibility and B-esterase activity from both insecticide-exposed and non-exposed field populations of amphipods Hyalella curvispina were studied. Two subpopulations, one susceptible to carbaryl (LC50=213±7.5μg/L carbaryl) and one resistant to it (LC50=14,663±2379μg/L carbaryl), were found in the agricultural area selected in this study...
April 19, 2017: Aquatic Toxicology
https://www.readbyqxmd.com/read/28458150/toxicity-of-clomazone-and-its-formulations-to-zebrafish-embryos-danio-rerio
#13
Marija Stevanovic, Slavica Gasic, Marek Pipal, Lucie Blahova, Dragica Brkic, Nesko Neskovic, Klara Hilscherova
Herbicides are the most widely used group of pesticides but after reaching water bodies they are able to cause adverse effects on non-target organisms. Different formulations using the same active ingredient are frequently available, which raises the issue of potential influence of different formulation types on herbicide toxicity. The present study evaluated the toxicity and teratogenic effects of the active ingredient clomazone and its two formulations (Rampa(®) EC and GAT Cenit 36 CS, both containing 360g a...
April 19, 2017: Aquatic Toxicology
https://www.readbyqxmd.com/read/28437657/toxicity-and-bioaccumulation-of-three-hexabromocyclododecane-diastereoisomers-in-the-marine-copepod-tigriopus-japonicas
#14
Haizheng Hong, Dongmei Lv, Wanxin Liu, Lingming Huang, Leyun Chen, Rong Shen, Dalin Shi
The three major hexabromocyclododecane (HBCD) diastereoisomers, i.e. α-, β- and γ-HBCD, have distinct physical and chemical properties that may potentially result in different levels of bioaccumulation and toxicity in aquatic organisms. To assess the impact of diastereomeric variation in HBCDs, the marine copepod Tigriopus japonicus was exposed to α-, β- and γ-HBCD in isolation. Results showed that all the three diastereoisomers had a similar potency to cause growth delay in T. japonicas. Variation was observed in the overall survival rate with exposure to α- and β-HBCD, and this resulted in significantly higher lethal toxicity in T...
April 18, 2017: Aquatic Toxicology
https://www.readbyqxmd.com/read/28441609/dechlorane-plus-induces-oxidative-stress-and-decreases-cyclooxygenase-activity-in-the-blue-mussel
#15
Pierre-Luc Gagné, Marlène Fortier, Marc Fraser, Lise Parent, Cathy Vaillancourt, Jonathan Verreault
Dechlorane Plus (DP) is a chlorinated flame retardant used mainly in electrical wire and cable coating, computer connectors, and plastic roofing materials. Concentrations of DP (syn and anti isomers) are increasingly being reported in aquatic ecosystems worldwide. However, there is exceedingly little information on the exposure-related toxicity of DP in aquatic organisms, especially in bivalves. The objective of this study was to investigate the in vivo and in vitro effects of DP exposure on histopathology, lipid peroxidation (LPO) levels, cyclooxygenase (COX) activity, phagocytosis capacity and efficiency, and DNA strand breakage in the blue mussel (Mytilus edulis) following a 29days exposure (0...
April 17, 2017: Aquatic Toxicology
https://www.readbyqxmd.com/read/28441607/toxicity-assessment-of-zno-decorated-au-nanoparticles-in-the-mediterranean-clam-ruditapes-decussatus
#16
Badreddine Sellami, Amine Mezni, Abdelhafidh Khazri, Imen Bouzidi, Wiem Saidani, David Sheehan, Hamouda Beyrem
The synthesis of hybrid nanomaterials has greatly increased in recent years due to their special physical and chemical properties. However, information regarding the environmental toxicity associated with these chemicals is limited, in particular in the aquatic environment. In the present study, an experiment was performed in which the marine bivalve (Ruditapes decussatus) was exposed for 14days to 2 concentrations of zinc oxide-decorated Au nanoparticles (Au-ZnONPs: Au-ZnONP50=50μg/L; Au-ZnONP100=100μg/L)...
April 15, 2017: Aquatic Toxicology
https://www.readbyqxmd.com/read/28445789/characterisation-of-pb-induced-changes-and-prediction-of-pb-exposure-in-microalgae-using-infrared-spectroscopy
#17
Ly Dao, John Beardall, Philip Heraud
Macromolecular changes in Chlorella sp. FleB1 and Scenedesmus acutus YaA6 exposed to Pb were characterised by Attenuated Total Reflectance-Fourier Transform Infrared (ATR-FTIR) spectroscopy. Spectra were collected in the mid-infrared spectral region and a chemometric approach was used to analyse the spectra. Principal Component Analysis showed that under Pb treatment, carbohydrates and lipids increased while proteins and phosphorylated molecules decreased in both the isolates. These conclusions were corroborated by conventional measurements of photosynthesis and neutral lipids...
April 14, 2017: Aquatic Toxicology
https://www.readbyqxmd.com/read/28441608/phylogenetic-signals-in-detoxification-pathways-in-cyprinid-and-centrarchid-species-in-relation-to-sensitivity-to-environmental-pollutants
#18
Peter van den Hurk, Lindsay E Gerzel, Peter Calomiris, Dennis C Haney
Observations in a previous study on biomarker responses in fish collected from urban creeks in Greenville, SC, indicated that there might be considerable differences in the expression of biotransformation enzymes in chub and sunfish species. To further investigate these species differences a dosing experiment was performed in which bluehead and creek chub (Nocomis leptocephalus and Semotilus atromaculatus), and redbreast sunfish, pumpkinseed, and bluegill (Lepomis auritus, L. gibbosus, and L. macrochirus) were injected with benzo[a]pyrene (BaP) as a model compound for common pollutants in urban creeks...
April 13, 2017: Aquatic Toxicology
https://www.readbyqxmd.com/read/28500902/rna-sequencing-and-pathway-analysis-reveal-alteration-of-hepatic-steroid-biosynthesis-and-retinol-metabolism-by-tributyltin-exposure-in-male-rare-minnow-gobiocypris-rarus
#19
Jiliang Zhang, Chunnuan Zhang, Ping Sun, Maoxian Huang, Mingzhen Fan, Min Liu
Tributyltin (TBT) is widely spread in aquatic ecosystems. Although adverse effects of TBT on reproduction and lipogenesis are observed in fishes, the underlying mechanisms, especially in livers, are still scarce and inconclusive. Thus, RNA-sequencing runs were performed on the hepatic libraries of adult male rare minnow (Gobiocypris rarus) after TBT exposure for 60d. After differentially expressed genes were identified, enrichment analysis and validation by quantitative real-time PCR were conducted. The results showed that TBT up-regulated the profile of hepatic genes in the steroid biosynthesis pathway and down-regulated the profile of hepatic genes in the retinol metabolism pathway...
April 8, 2017: Aquatic Toxicology
https://www.readbyqxmd.com/read/28324829/interactive-effects-of-an-insecticide-and-a-fungicide-on-different-organism-groups-and-ecosystem-functioning-in-a-stream-detrital-food-web
#20
Mohab Dawoud, Mirco Bundschuh, Willem Goedkoop, Brendan G McKie
Freshwater ecosystems are often affected by cocktails of multiple pesticides targeting different organism groups. Prediction and evaluation of the ecosystem-level effects of these mixtures is complicated by the potential not only for interactions among the pesticides themselves, but also for the pesticides to alter biotic interactions across trophic levels. In a stream microcosm experiment, we investigated the effects of two pesticides targeting two organism groups (the insecticide lindane and fungicide azoxystrobin) on the functioning of a model stream detrital food web consisting of a detritivore (Ispoda: Asellus aquaticus) and microbes (an assemblage of fungal hyphomycetes) consuming leaf litter...
March 9, 2017: Aquatic Toxicology
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