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https://www.readbyqxmd.com/read/29150731/cellular-and-molecular-responses-of-adult-zebrafish-after-exposure-to-cuo-nanoparticles-or-ionic-copper
#1
Unai Vicario-Parés, Jose M Lacave, Paul Reip, Miren P Cajaraville, Amaia Orbea
Due to their antimicrobial, electrical and magnetic properties, copper nanoparticles (NPs) are suitable for a vast array of applications. Copper can be toxic to biota, making it necessary to assess the potential hazard of copper nanomaterials. Zebrafish (Danio rerio) were exposed to 10 µg Cu/L of CuO NPs of ≈100 nm (CuO-poly) or ionic copper to compare the effects provoked after 3 and 21 days of exposure and at 6 months post-exposure (mpe). At 21 days, significant copper accumulation was only detected in fish exposed to ionic copper...
November 17, 2017: Ecotoxicology
https://www.readbyqxmd.com/read/29150256/reproductive-effects-linked-to-dna-methylation-in-male-zebrafish-chronically-exposed-to-environmentally-relevant-concentrations-of-di-2-ethylhexyl-phthalate
#2
Yan-Bo Ma, Pan-Pan Jia, Muhammad Junaid, Li Yang, Chun-Jiao Lu, De-Sheng Pei
Di-(2-ethylhexyl) phthalate (DEHP) possesses the potential to interfere with the male reproductive endocrine system in mammals; however, its reproductive toxicity in male zebrafish and associated epigenetic studies have not been explored. In this study, three-month-old male zebrafish were exposed to environmentally relevant concentrations of DEHP (0, 10, 33 and 100 μg/L) for 3 months, and then the impact on the reproduction of males and the underlying mechanism were investigated. Histological testing showed that an exposure concentration of 100 μg/L DEHP significantly inhibited spermatogenesis, with an associated decline in capability to fertilize untreated oocytes...
November 14, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/29149642/oxidative-stress-cell-cycle-arrest-dna-damage-and-apoptosis-in-adult-zebrafish-danio-rerio-induced-by-tris-1-3-dichloro-2-propyl-phosphate
#3
Hanyan Chen, Pingping Wang, Zhongkun Du, Guowei Wang, Shixiang Gao
Tris(1,3-dichloro-2-propyl)phosphate (TDCPP) is an additive flame retardant of high production volume, and frequently detected in biota and environment. However, knowledge on its potential risk and toxicological mechanism still remains limited. In this study, DNA damage, transcriptomic responses and biochemical changes in the liver of zebrafish (Danio rerio) induced by TDCPP were investigated. Zebrafish was exposed to 45.81μg/L (1/100 (96h-LC50)) and 229.05μg/L (1/20 (96h-LC50)) TDCPP for 7 d. The reactive oxygen species (ROS) and GSH contents, in addition to antioxidant enzyme activities in the liver changed significantly, and the mRNA levels of genes related to oxidative stress were alerted in a dose-dependent and/or sex-dependent manner after exposure to TDCPP...
November 10, 2017: Aquatic Toxicology
https://www.readbyqxmd.com/read/29148042/comparative-anatomy-of-zebrafish-paired-and-median-fin-muscles-basis-for-functional-developmental-and-macroevolutionary-studies
#4
Natalia Siomava, Rui Diogo
In the last decades, Danio rerio became one of the most used model organisms in various evo-devo studies devoted to the fin skeletal anatomy and fin-limb transition. Surprisingly, there is not even a single paper about the detailed anatomy of the adult muscles of the five fin types of this species. To facilitate more integrative developmental, functional, genetic, and evolutionary studies of the appendicular musculoskeletal system of the zebrafish and to provide a basis for further comparisons with other fishes and tetrapods, we describe here the identity, overall configuration, and attachments of appendicular muscles in a way that can be easily understood and implemented by non-anatomist researchers...
November 17, 2017: Journal of Anatomy
https://www.readbyqxmd.com/read/29147875/evaluation-of-nfsa-like-nitroreductases-from-neisseria-meningitidis-and-bartonella-henselae-for-enzyme-prodrug-therapy-targeted-cellular-ablation-and-dinitrotoluene-bioremediation
#5
Michelle H Rich, Abigail V Sharrock, Kelsi R Hall, David F Ackerley, Joanna K MacKichan
OBJECTIVES: To characterize the activities of two candidate nitroreductases, Neisseria meningitidis NfsA (NfsA_Nm) and Bartonella henselae (PnbA_Bh), with the nitro-prodrugs, CB1954 and metronidazole, and the environmental pollutants 2,4- and 2,6-dinitrotoluene. RESULTS: NfsA_Nm and PnbA_Bh were evaluated in Escherichia coli over-expression assays and as His6-tagged proteins in vitro. With the anti-cancer prodrug CB1954, both enzymes were more effective than the canonical O2-insensitive nitroreductase E...
November 17, 2017: Biotechnology Letters
https://www.readbyqxmd.com/read/29147715/the-impact-of-ultraviolet-b-uv-b-radiation-in-combination-with-different-temperatures-in-the-early-life-stage-of-zebrafish-danio-rerio
#6
Feyza Icoglu Aksakal, Abdulkadir Ciltas
Ultraviolet B (UV-B) radiation is an environmental stressor with detrimental effects on many aquatic organisms including fish. In addition, UV-B exposure combined with other environmental factors could have even more negative effects. The purpose of this study was to investigate the effect of UV-B radiation exposure on zebrafish embryos/larvae in terms of survival, developmental toxicity and the mRNA levels of the genes related to oxidative stress and innate immune response at different temperatures (24 °C, 28 °C and 30 °C)...
November 17, 2017: Photochemical & Photobiological Sciences
https://www.readbyqxmd.com/read/29146197/illicit-drug-ketamine-induces-adverse-effects-from-behavioral-alterations-and-oxidative-stress-to-p53-regulated-apoptosis-in-medaka-fish-under-environmentally-relevant-exposures
#7
Pei-Han Liao, Wen-Kai Yang, Ching-Hsin Yang, Chun-Hon Lin, Chin-Chu Hwang, Pei-Jen Chen
With increasing problems of drug abuse worldwide, aquatic ecosystems are contaminated by human pharmaceuticals from the discharge of hospital or municipal effluent. However, ecotoxicity data and related toxic mechanism for neuroactive controlled or illicit drugs are still lacking, so assessing the associated hazardous risk is difficult. This study aims to investigate the behavioral changes, oxidative stress, gene expression and neurotoxic or apoptosis effect(s) in larvae of medaka fish (Oryzias latipes) with environmentally relevant exposures of ketamine (KET) solutions for 1-14 days...
November 13, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/29145436/scrambled-eggs-proteomic-portraits-and-novel-biomarkers-of-egg-quality-in-zebrafish-danio-rerio
#8
Ozlem Yilmaz, Amélie Patinote, Thao Vi Nguyen, Emmanuelle Com, Regis Lavigne, Charles Pineau, Craig V Sullivan, Julien Bobe
Egg quality is a complex biological trait and a major determinant of reproductive fitness in all animals. This study delivered the first proteomic portraits of egg quality in zebrafish, a leading biomedical model for early development. Egg batches of good and poor quality, evidenced by embryo survival for 24 h, were sampled immediately after spawning and used to create pooled or replicated sample sets whose protein extracts were subjected to different levels of fractionation before liquid chromatography and tandem mass spectrometry...
2017: PloS One
https://www.readbyqxmd.com/read/29145140/fluoxetine-modulates-the-transcription-of-genes-involved-in-serotonin-dopamine-and-adrenergic-signalling-in-zebrafish-embryos
#9
V Cunha, P Rodrigues, M M Santos, P Moradas-Ferreira, M Ferreira
Neurotransmitters pathways in fish and mammals are phylogenetically conserved. Therefore, the environmental presence of psychopharmaceuticals, such as fluoxetine (FLU), are likely to interact with fish serotonergic, dopaminergic and adrenergic systems, affecting their response and associated biological functions. Hence, the present work aimed at evaluating the effects of FLU in the transcription of genes involved in serotonin, dopamine and adrenergic transporters and receptors signalling in early stages of Danio rerio development...
October 27, 2017: Chemosphere
https://www.readbyqxmd.com/read/29145131/removal-of-the-precursors-of-n-nitrosodiethylamine-ndea-an-emerging-disinfection-byproduct-in-drinking-water-treatment-process-and-its-toxicity-to-adult-zebrafish-danio-rerio
#10
Jian Zheng, Tao Lin, Wei Chen
N-nitrosodiethylamine (NDEA) is one of the emerging nitrogenous disinfection byproducts with probable cytotoxicity, genotoxicity, and carcinogenesis. Its potential toxicological effects have received extensive attention but remain to be poorly understood. In this study, changes in NDEA precursors in drinking water treatment process were studied using the trial of its formation potential (FP), and the toxicity induced by NDEA to adult zebrafish was investigated. NDEA FP in the raw water of Taihu Lake ranged from 46...
October 10, 2017: Chemosphere
https://www.readbyqxmd.com/read/29145093/proteomic-profile-and-toxicity-pathway-analysis-in-zebrafish-embryos-exposed-to-bisphenol-a-and-di-n-butyl-phthalate-at-environmentally-relevant-levels
#11
Xing Dong, Xuchun Qiu, Shunlong Meng, Hai Xu, Xiangyang Wu, Ming Yang
Bisphenol A (BPA) and di-n-butyl phthalate (DBP) are well-known endocrine-disrupting chemicals (EDCs) that have human health risks. Chronic exposure to BPA and DBP increases the occurrence of human disease. Despite the potential for exposure in embryonic development, the mechanism of action of BPA and DBP on vertebrate development and disease still remains unclear. In the present study, we identified proteins and protein networks that are perturbed by BPA and DBP during zebrafish (Danio rerio) development. Zebrafish embryos were exposed to environmentally relevant levels of BPA (10 μg/L) and DBP (50 μg/L) for 96 h...
November 10, 2017: Chemosphere
https://www.readbyqxmd.com/read/29144727/ex-vivo-measurement-of-electrically-evoked-dopamine-release-in-zebrafish-whole-brain
#12
Mimi Shin, Thomas M Field, Chase S Stucky, Mia N Furgurson, Michael A Johnson
No abstract text is available yet for this article.
November 16, 2017: ACS Chemical Neuroscience
https://www.readbyqxmd.com/read/29144233/a-high-resolution-mrna-expression-time-course-of-embryonic-development-in-zebrafish
#13
Richard J White, John E Collins, Ian M Sealy, Neha Wali, Christopher M Dooley, Zsofia Digby, Derek L Stemple, Daniel N Murphy, Konstantinos Billis, Thibaut Hourlier, Anja Füllgrabe, Matthew P Davis, Anton J Enright, Elisabeth M Busch-Nentwich
We have produced an mRNA expression time course of zebrafish development across 18 time points from 1 cell to 5 days post-fertilisation sampling individual and pools of embryos. Using poly(A) pulldown stranded RNA-seq and a 3' end transcript counting method we characterise temporal expression profiles of 23,642 genes. We identify temporal and functional transcript co-variance that associates 5024 unnamed genes with distinct developmental time points. Specifically, a class of over 100 previously uncharacterised zinc finger domain containing genes, located on the long arm of chromosome 4, is expressed in a sharp peak during zygotic genome activation...
November 16, 2017: ELife
https://www.readbyqxmd.com/read/29144200/mechanisms-underlying-melatonin-mediated-prevention-of-fenvalerate-induced-behavioral-and-oxidative-toxicity-in-zebrafish
#14
Jingjing Han, Cheng Ji, Yichen Guo, Rui Yan, Ting Hong, Yuanyan Dou, Yan An, Shasha Tao, Fenju Qin, Jihua Nie, Chen Ji, Han Wang, Jian Tong, Wei Xiao, Jie Zhang
The neurotoxic effects attributed to the pesticide fenvalerate (FEN) are well-established. The aim of this study was to determine whether melatonin (MLT) was able to protect against FEN-induced behavior, oxidative stress, apoptosis, and neurogenesis using zebrafish (Danio rerio) model. Zebrafish exposed to 100 μg/L FEN for 120 h exhibited decreased swimming activity accompanied by downregulated expression of neurogenesis-related genes (Dlx2, Shha, Ngn1, Elavl3, and Gfap), suggesting that neurogenesis were impaired...
November 16, 2017: Journal of Toxicology and Environmental Health. Part A
https://www.readbyqxmd.com/read/29142988/proximal-tubular-expression-patterns-of-megalin-and-cubilin-in-proteinuric-nephropathies
#15
Jia Sun, Kjell Hultenby, Jonas Axelsson, Johan Nordström, Bing He, Annika Wernerson, Karin Lindström
Introduction: Receptor-mediated endocytosis is responsible for protein reabsorption in the proximal tubules. For albumin this process involves at least 2 interacting receptors, megalin and cubilin. Albumin is not usually present in the urine, indicating a highly efficient tubular reuptake under physiological conditions. However, early appearance of albuminuria may mean that the tubular system is overwhelmed by large quantities of albumin or that the function is impaired. Methods: To better understand the physiological role of megalin and cubilin in human renal disease, renal biopsies from 15 patients with a range of albuminuria and 3 healthy living donors were analyzed for proximal tubular expression of megalin and cubilin using immunohistochemistry (IHC) and semiquantitative immune-electron microscopy...
July 2017: KI Reports
https://www.readbyqxmd.com/read/29142761/aeromonas-hydrophila-utilizes-tlr4-topology-for-synchronous-activation-of-myd88-and-trif-to-orchestrate-anti-inflammatory-responses-in-zebrafish
#16
Nidhi Srivastava, Asha Shelly, Manmohan Kumar, Archana Pant, Bhabatosh Das, Tanmay Majumdar, Shibnath Mazumder
Toll-like receptor 4 (TLR4) plays a critical role in host immunity against Gram-negative bacteria. It transduces signals through two distinct TIR-domain-containing adaptors, MyD88 and TRIF, which function at the plasma membrane and endosomes, respectively. Using zebrafish Aeromonas hydrophila infection model, we demonstrate that synchronization of MyD88 and TRIF dependent pathways is critical for determining the fate of infection. Zebrafish were infected with A. hydrophila, and bacterial recovery studies suggested its effective persistence inside the host...
2017: Cell Death Discovery
https://www.readbyqxmd.com/read/29142194/transient-cardiomyocyte-fusion-regulates-cardiac-development-in-zebrafish
#17
Suphansa Sawamiphak, Zacharias Kontarakis, Alessandro Filosa, Sven Reischauer, Didier Y R Stainier
Cells can sacrifice their individuality by fusing, but the prevalence and significance of this process are poorly understood. To approach these questions, here we generate transgenic reporter lines in zebrafish to label and specifically ablate fused cells. In addition to skeletal muscle cells, the reporters label cardiomyocytes starting at an early developmental stage. Genetic mosaics generated by cell transplantation show cardiomyocytes expressing both donor- and host-derived transgenes, confirming the occurrence of fusion in larval hearts...
November 15, 2017: Nature Communications
https://www.readbyqxmd.com/read/29142075/cone-myoid-elongation-involves-unidirectional-microtubule-movement-mediated-by-dynein-1
#18
Tylor R Lewis, Mariusz Zareba, Brian A Link, Joseph C Besharse
Teleosts and amphibians exhibit retinomotor movements, morphological changes in photoreceptors regulated by light and circadian rhythms. Cone myoid elongation occurs during dark adaptation leading to the positioning of the cone outer segment closer to the retinal pigment epithelium. While it has been shown that microtubules are essential for cone myoid elongation, the underlying mechanism has not been established. In this work, we generated a transgenic line of zebrafish expressing a photoconvertible form of α-tubulin (tdEOS-tubulin) specifically in cone photoreceptors...
November 15, 2017: Molecular Biology of the Cell
https://www.readbyqxmd.com/read/29141695/methylxanthines-induce-structural-and-functional-alterations-of-the-cardiac-system-in-zebrafish-embryos
#19
Ram Manohar Basnet, Daniela Zizioli, Michela Guarienti, Dario Finazzi, Maurizio Memo
BACKGROUND: Zebrafish embryos are emerging as a model for pharmacological and toxicological studies. We used zebrafish embryos to study the general toxicity and cardiovascular effects of eight methylxanthines: aminophylline, caffeine, diprophylline, doxofylline, etophylline, 3-isobutyl-1-methylxanthine (IBMX), pentoxifylline and theophylline. METHODS: Microinjections of the eight methylxanthines were performed in 1-2 cell stage zebrafish embryos and the general toxicity and cardiovascular effects were analyzed at different time points...
November 15, 2017: BMC Pharmacology & Toxicology
https://www.readbyqxmd.com/read/29141689/patient-derived-xenograft-in-zebrafish-embryos-a-new-platform-for-translational-research-in-gastric-cancer
#20
Jia-Qi Wu, Jing Zhai, Chong-Yong Li, Ai-Min Tan, Ping Wei, Li-Zong Shen, Ming-Fang He
BACKGROUND: Gastric cancer (GC) is among the most commonly cancer occurred in Asian, especially in China. With its high heterogeneity and few of validated drug targets, GC remains to be one of the most under explored areas of precision medicine. In this study, we aimed to establish an in vivo patient-derived xenograft (PDX) model based on zebrafish (Danio rerio) embryos, allowing for a rapid analysis of the angiogenic and invasive potentials, as well as a fast drug sensitivity testing...
November 15, 2017: Journal of Experimental & Clinical Cancer Research: CR
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