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Aquatic Toxicology

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https://www.readbyqxmd.com/read/28934643/combined-effects-of-microcystin-and-nitrite-on-the-growth-lipid-peroxidation-and-antioxidant-responses-of-the-freshwater-rotifer-brachionus-calyciflorus
#1
Ye Liang, Xinglan Chen, Xuxin Lu, Sichen Jin, Yuanqi Min, Jiaxin Yang
Toxicants released during the degradation of cyanobacterial blooms, such as microcystin-LR (MC-LR) and nitrite (NO2-N), affect the growth of aquatic organisms. The freshwater rotifer Brachionus calyciflorus was exposed to solutions with different combined concentrations of MC-LR (0, 10, 50, 100, and 200μgL(-1)) and NO2-N (0, 2, 4, 6, and 8mgL(-1)) to assess the combined effects of MC-LR and NO2-N on life cycle parameters and oxidative stress. Single solutions of MC-LR 200μgL(-1) and NO2-N 8mgL(-1) were toxic to rotifers...
September 14, 2017: Aquatic Toxicology
https://www.readbyqxmd.com/read/28934642/physiological-responses-and-gene-expression-changes-in-the-western-mosquitofish-gambusia-affinis-exposed-to-progesterone-at-environmentally-relevant-concentrations
#2
Liping Hou, Hongyan Xu, Guangguo Ying, Yang Yang, Hu Shu, Jianliang Zhao, Xuemei Cheng
Progesterone (P4) is a natural and synthetic steroid, widely distributed in the aquatic environments. It can lead to adverse effects on the endocrine system in aquatic organisms. This study investigated the toxicological effects of exposure to environmentally relevant concentrations (4, 44, and 410ng/L) of progesterone for 42 d on adult female mosquitofish, Gambusia affinis. We performed morphological and histological analyses on gonads, anal fins, liver, and gills after the exposure of mosquito fish to P4...
September 14, 2017: Aquatic Toxicology
https://www.readbyqxmd.com/read/28917945/toxic-responses-of-perna-viridis-hepatopancreas-exposed-to-ddt-benzo-a-pyrene-and-their-mixture-uncovered-by-itraq-based-proteomics-and-nmr-based-metabolomics
#3
Qinqin Song, Hailong Zhou, Qian Han, Xiaoping Diao
Dichlorodiphenyltrichloroethane (DDT) and benzo(a)pyrene (BaP) are environmental estrogens (EEs) that are ubiquitous in the marine environment. In the present study, we integrated isobaric tags for relative and absolute quantitation (iTRAQ)-based proteomic and nuclear magnetic resonance (NMR)-based metabolomic approaches to explore the toxic responses of green mussel hepatopancreas exposed to DDT (10μg/L), BaP (10μg/L) and their mixture. The metabolic responses indicated that BaP primarily disturbed energy metabolism and osmotic regulation in the hepatopancreas of the male green mussel P...
September 11, 2017: Aquatic Toxicology
https://www.readbyqxmd.com/read/28917944/tetrabromoethylcyclohexane-affects-gonadal-differentiation-and-development-in-the-frog-pelophylax-nigromaculatus
#4
Peng-Yan Liu, Tan Meng, Yuan-Yuan Li, Man Cai, Xing-Hong Li, Juan Chen, Zhan-Fen Qin
Tetrabromoethylcyclohexane (TBECH), an additive brominated flame retardant, has been shown to have an androgenic activity in vitro. In the present study, we aimed to investigate the effects of TBECH on gonadal differentiation and development in the frog Pelophylax nigromaculatus, an amphibian species sensitive to androgenic chemicals, and to assess the androgenic activity of TBECH in vivo. P. nigromaculatus tadpoles were exposed to TBECH (1, 10, 100nM) from Gosner stage 24 to complete metamorphosis, and to 5α-dihydrotestosterone (DHT) as a positive control...
September 9, 2017: Aquatic Toxicology
https://www.readbyqxmd.com/read/28917946/cellular-uptake-and-intracellular-localization-of-poly-acrylic-acid-nanoparticles-in-a-rainbow-trout-oncorhynchus-mykiss-gill-epithelial-cell-line-rtgill-w1
#5
Lindsey C Felix, Van A Ortega, Greg G Goss
The ever-growing production of engineered nanoparticles (NPs) for use in many agricultural, commercial, consumer, and industrial applications will lead to their accidental or intentional release into the environment. Potential routes of environmental exposure include manufacturing or transport spills, disposal of NP-containing products down the drain and/or in landfills, as well as direct usage on agricultural land. Therefore, NPs will inevitably contaminate aquatic environments and interact with resident organisms...
September 7, 2017: Aquatic Toxicology
https://www.readbyqxmd.com/read/28917943/chronic-fluoride-exposure-exacerbates-headkidney-pathology-and-causes-immune-commotion-in-clarias-gariepinus
#6
Rashmi Singh, Md Arafat Hussain, Jai Kumar, Manmohan Kumar, Usha Kumari, Shibnath Mazumder
The current study was aimed to understand the effects of chronic fluoride exposure on fish immune system. African sharp tooth catfish (Clarias gariepinus) were exposed to 73.45mg/L of fluoride corresponding to 1/10 96h LC50 for 30 d and the effects on general fish health and several immune parameters were studied. Chronic fluoride exposure led to significant alteration in serum biochemical parameters including alkaline phosphatase, alanine transaminase, aspartate transaminase, triglycerides, cholesterol and blood urea nitrogen levels revealing the detrimental effect of fluoride on general fish health...
September 6, 2017: Aquatic Toxicology
https://www.readbyqxmd.com/read/28898784/variable-silver-nanoparticle-toxicity-to-daphnia-in-boreal-lakes
#7
Andrea L Conine, Daniel C Rearick, Marguerite A Xenopoulos, Paul C Frost
Variable sensitivity of organisms to silver nanoparticles (AgNPs) caused by changes in physico-chemical variables in aquatic ecosystems is receiving increasing attention. Variables such as dissolved organic carbon, pH, light, the presence of algae and bacteria, dissolved oxygen and different ions have all been studied individually, but it is still unclear how these variables in combination alter AgNP toxicity in natural ecosystems. Here we examined AgNP toxicity on survival of wild-caught Daphnia using AgNP suspensions placed in water from several different lakes at the IISD-Experimental Lakes Area, which span a gradient of water quality parameters...
September 6, 2017: Aquatic Toxicology
https://www.readbyqxmd.com/read/28898785/tris-1-3-dichloro-2-propyl-phosphate-disrupts-axonal-growth-cholinergic-system-and-motor-behavior-in-early-life-zebrafish
#8
Rui Cheng, Yali Jia, Lili Dai, Chunsheng Liu, Jianghua Wang, Guangyu Li, Liqin Yu
Tris(1,3-dichloro-2-propyl) phosphate (TDCIPP) could have neurotoxic effects and alter motor behaviors in zebrafish (Danio rerio) larvae, however, the underlying mechanisms are still unknown. In this study, zebrafish embryos were subjected to waterborne exposure of TDCIPP at 100, 300, 600, 900μg/L from 2 to 120-h post-fertilization (hpf). Behavioral measurements indicate that TDCIPP exposure significantly elevated spontaneous movement, and altered swimming behavior response of larvae to both light and dark stimulation...
September 5, 2017: Aquatic Toxicology
https://www.readbyqxmd.com/read/28910660/toxic-effects-of-pb-2-entering-sperm-through-ca-2-channels-in-the-freshwater-crab-sinopotamon-henanense
#9
Na Li, Peng Xu, Wei-Xin Jing, Jiang-Shiou Hwang, Lan Wang
Lead (Pb) is a heavy metal that can damage animal sperm. To study the effects of Pb on calcium homeostasis and calcium channel in the sperm of freshwater crab Sinopotamon henanense, the induction of acrosome reaction (AR) and acrosin activity were investigated when crabs were exposed to different Pb concentrations (0, 3.675, 7.35, 14.7, 29.4 and 58.8mg/L) for 3, 5 and 7 d separately. Fluorescent probe Fluo-3/AM was loaded into the sperm, and [Ca(2+)] in the sperm was measured by fluorescence microscopy and using microplate reader...
September 4, 2017: Aquatic Toxicology
https://www.readbyqxmd.com/read/28910659/effects-of-triphenyltin-on-reproduction-in-japanese-medaka-oryzias-latipes-across-two-generations
#10
Yoshifumi Horie, Haruna Watanabe, Hitomi Takanobu, Yoshiko Shigemoto, Takahiro Yamagishi, Taisen Iguchi, Norihisa Tatarazako
Triphenyltin (TPT) is an organotin compound used in marine anti-fouling coatings to prevent the attachment and growth of marine organisms, and it has negative effects on aquatic organisms. TPT is still detected at low concentrations, although its use has been prohibited at least in the European Community and is restricted in Japan as well. Studies using Japanese medaka (Oryzias latipes) indicate that TPT has the potential to inhibit reproduction. Although TPT is detected in many aquatic ecosystems, the multi-generational impact of TPT remains unknown...
August 31, 2017: Aquatic Toxicology
https://www.readbyqxmd.com/read/28869925/cadmium-stress-assessment-based-on-the-electrocardiogram-characteristics-of-zebra-fish-danio-rerio-qrs-complex-could-play-an-important-role
#11
Na Xing, Lizhen Ji, Jie Song, Jingchun Ma, Shangge Li, Zongming Ren, Fei Xu, Jianping Zhu
The electrocardiogram (ECG) of zebra fish (Danio rerio) expresses cardiac features that are similar to humans. Here we use sharp microelectrode measurements to obtain ECG characteristics in adult zebra fish and analyze the effects of cadmium chloride (CdCl2) on the heart. We observe the overall changes of ECG parameters in different treatments (0.1 TU, 0.5 TU and 1.0 TU CdCl2), including P wave, Q wave, R wave, S wave, T wave, PR interval (atrial contraction), QRS complex (ventricular depolarization), ST segment, and QT interval (ventricular repolarization)...
August 31, 2017: Aquatic Toxicology
https://www.readbyqxmd.com/read/28869924/methylisothiazolinone-toxicity-and-inhibition-of-wound-healing-and-regeneration-in-planaria
#12
Alanna V Van Huizen, Ai-Sun Tseng, Wendy S Beane
Methylisothiazolinone (MIT) is a common biocide used in cosmetic and industrial settings. Studies have demonstrated that MIT is a human sensitizer, to the extent that in 2013 MIT was named allergen of the year. Recently, we showed that MIT exposure in Xenopus laevis (the African clawed frog) inhibits wound healing and tail regeneration. However, it is unknown whether MIT affects these processes in other animals. Here, we investigated the effects of MIT exposure in planaria-non-parasitic freshwater flatworms able to regenerate all tissues after injury...
August 26, 2017: Aquatic Toxicology
https://www.readbyqxmd.com/read/28846860/biometric-and-physiological-responses-of-egeria-densa-planch-cultivated-with-toxic-and-non-toxic-strains-of-microcystis
#13
Cihelio A Amorim, Cláudia Ulisses, Ariadne Nascimento Moura
Cyanobacterial blooms are becoming increasingly common in aquatic environments around the world, mainly due to eutrophication and climate change. Cyanotoxin-producing strains (e.g., microcystins (MC) producers) may be present in these blooms, affecting the growth of other aquatic organisms, such as aquatic macrophytes. In this study, we evaluated the morphometric and physiological responses of the aquatic macrophyte Egeria densa to the exposure to a toxic strain of Microcystis aeruginosa (MCs producer) and a non-toxic Microcystis panniformis (non-MC producer)...
August 25, 2017: Aquatic Toxicology
https://www.readbyqxmd.com/read/28866280/estrogen-alters-gonadal-soma-derived-factor-gsdf-foxl2-expression-levels-in-the-testes-associated-with-testis-ova-differentiation-in-adult-medaka-oryzias-latipes
#14
Tohru Kobayashi, Ayaka Chiba, Tadashi Sato, Taijun Myosho, Jun Yamamoto, Tetsuro Okamura, Yuta Onishi, Mitsuru Sakaizumi, Satoshi Hamaguchi, Taisen Iguchi, Yoshifumi Horie
Testis-ova differentiation in sexually mature male medaka (Oryzias latipes) is easily induced by estrogenic chemicals, indicating that spermatogonia persist in sexual bipotentiality, even in mature testes in medaka. By contrast, the effects of estrogen on testicular somatic cells associated with testis-ova differentiation in medaka remain unclear. In this study, we focused on the dynamics of sex-related genes (Gsdf, Dmrt1, and Foxl2) expressed in Sertoli cells in the mature testes of adult medaka during estrogen-induced testis-ova differentiation...
August 22, 2017: Aquatic Toxicology
https://www.readbyqxmd.com/read/28843738/exposure-of-spermatozoa-to-dibutyl-phthalate-induces-abnormal-embryonic-development-in-a-marine-invertebrate-galeolaria-caespitosa-polychaeta-serpulidae
#15
Yonggang Lu, Minjie Lin, Robert John Aitken
In this study, we have investigated the impact of dibutyl phthalate (DBP) on early embryogenesis in a sessile marine invertebrate, Galeolaria caespitosa. DBP was found to induce sperm dysfunction as well as impaired and defective embryogenesis characterised by a particular pattern of abnormality. Thus, after the first cleavage, one blastomere in these abnormal embryos was able to carry out further mitoses, while the other arrested. Analysis of microtubules, chromosomes and actin filaments demonstrated that the mitotic spindles in the abnormal embryos were irregularly bent, shortened and unable to anchor to the cortex, resulting in the defective segregation of chromosomes...
August 19, 2017: Aquatic Toxicology
https://www.readbyqxmd.com/read/28843737/toxic-effects-of-triclosan-on-a-zebrafish-danio-rerio-liver-cell-line-zfl
#16
Zhou Zhou, Jie Yang, King Ming Chan
Triclosan (TCS, 5-chloro-2-(2,4-dichlorophenoxy) phenol) is an antimicrobial agent widely used in personal care products. It has been detected in surface water, soil, aquatic species, and even humans. In this study, we used zebrafish (Danio rerio) as a model to test the hypothesis that TCS exhibits toxic effects by interacting with thyroid hormone receptor β (TRβ) and aryl hydrocarbon receptor (AhR) and by inducing the transcription of thyroid hormone (TH)-associated genes and affecting phase I and phase II enzymes...
August 19, 2017: Aquatic Toxicology
https://www.readbyqxmd.com/read/28822891/comparative-toxicity-of-the-plasticizer-dibutyl-phthalate-to-two-freshwater-algae
#17
Shurui Gu, Hao Zheng, Qingqing Xu, Cuizhu Sun, Mei Shi, Zhenyu Wang, Fengmin Li
Phthalate esters (PAEs), a family of emerging environmental contaminants, have been frequently detected in soils and water. However, intensive studies on the toxicity of PAEs have focused on growth response of terrestrial and aquatic animals, while only limited attention has been paid to aquatic plants, especially phytoplankton, the primary producer in aquatic ecosystems. Therefore, the acute toxic effects and underlying mechanisms of dibutyl phthalate (DBP) at different concentrations (0-20mgL(-1)) on two typical freshwater algae (Scenedesmus obliquus and Chlorella pyrenoidosa) were investigated...
August 12, 2017: Aquatic Toxicology
https://www.readbyqxmd.com/read/28888166/sub-lethal-effects-of-waterborne-exposure-to-copper-nanoparticles-compared-to-copper-sulphate-on-the-shore-crab-carcinus-maenas
#18
Lisa M Rossbach, Benjamin J Shaw, Dawid Piegza, William F Vevers, Andrew J Atfield, Richard D Handy
The toxicity of soluble copper (Cu) to marine organisms is reasonably well described. However, the hazard of Cu engineered nanomaterial (ENMs) is poorly understood. The aim of the present study was to compare the toxicity of Cu ENMs to Cu as CuSO4 in the shore crab, Carcinus maenas. The crabs were exposed via the water using a semi-static approach to 0.2 or 1mgL(-1) of Cu ENMs or 1mgL(-1) of Cu as CuSO4. Gills, hepatopancreas, chela muscle and haemolymph were collected at days 0, 4 and 7 for the body burden of Cu, histology and biochemical analysis [thiobarbituric acid reactive substances (TBARS) and total glutathione (GSH)]...
August 10, 2017: Aquatic Toxicology
https://www.readbyqxmd.com/read/28841494/zebrafish-sex-differentiation-and-gonad-development-a-review-on-the-impact-of-environmental-factors
#19
REVIEW
Dércia Santos, Ana Luzio, Ana M Coimbra
Zebrafish (Danio rerio) is extensively used in research; however the mechanisms that control this species sex determination are still poorly understood. In the latest decades, it has been established that zebrafish sex is determined by genetic factors on a polygenic basis, as various candidate genes with sex dimorphic expression, as well sex-linked loci have been identified in different zebrafish strains. However, it has been evidenced that sex determination in this species is also influenced by environmental factors...
August 10, 2017: Aquatic Toxicology
https://www.readbyqxmd.com/read/28866281/integrated-assessment-of-toxic-effects-of-maghemite-%C3%AE-fe2o3-nanoparticles-in-zebrafish
#20
Rolando A R Villacis, José S Filho, Benjamin Piña, Ricardo B Azevedo, Aline Pic-Taylor, Juliana F Mazzeu, Cesar K Grisolia
The increasing use of nanotechnology in the last decade has raised concerns about the impact of nanoparticles in the environment. In particular, the potential harmful effects of iron oxide nanoparticles (IONPs) in aquatic organisms have been poorly addressed. We analyze here the toxic effects induced by IONPs in zebrafish using a combination of classical (genotoxicity, oxidative stress) and molecular (transcriptomic) methodologies. Adult animals were exposed for 96h to five sub-lethal IONP concentrations, ranging from 4...
August 8, 2017: Aquatic Toxicology
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