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Doreen H Bartlett, Susan B Silk
In support of the new column in Zebrafish dedicated to initiating conversations about animal care policies and compliance for the zebrafish, the Office of Laboratory Animal Welfare (OLAW) has offered the following clarification and guidance.
October 25, 2016: Zebrafish
Matthew D Keefe, Joshua L Bonkowsky
There has been a rapid expansion in use of transgenic technologies in zebrafish. We report a novel example of trans-interactions of genetic elements, or transvection. This interaction led to a novel expression pattern and illustrates a precautionary example regarding use of transgenes in zebrafish.
October 25, 2016: Zebrafish
Lloyd Hamilton, Katy R Astell, Gergana Velikova, Dirk Sieger
Glioblastoma multiforme is the most common and deadliest form of brain cancer. Glioblastomas are infiltrated by a high number of microglia, which promote tumor growth and surrounding tissue invasion. However, it is unclear how microglia and glioma cells physically interact and if there are differences, depending on glioma cell type. Hence, we have developed a novel live imaging assay to study microglia-glioma interactions in vivo in the zebrafish brain. We transplanted well-established human glioblastoma cell lines, U87 and U251, into transgenic zebrafish lines with labelled macrophages/microglia...
October 25, 2016: Zebrafish
Kayla Huemer, Jayne M Squirrell, Robert Swader, Danny C LeBert, Anna Huttenlocher, Kevin W Eliceiri
Zebrafish, an established model organism in developmental biology, is also a valuable tool for imaging wound healing in space and time with cellular resolution. However, long-term imaging of wound healing poses technical challenges as wound healing occurs over multiple temporal scales. The traditional strategy of larval encapsulation in agarose successfully limits sample movement but impedes larval development and tissue regrowth and is therefore not amenable to long-term imaging of wound healing. To overcome this challenge, we engineered a functionally compartmentalized device, the zebrafish Wounding and Entrapment Device for Growth and Imaging (zWEDGI), to orient larvae for high-resolution microscopy, including confocal and second harmonic generation (SHG), while allowing unrestrained tail development and regrowth...
September 27, 2016: Zebrafish
Jamille A Bitencourt, Iracilda Sampaio, Robson T C Ramos, Marcelo Ricardo Vicari, Paulo Roberto A de M Affonso
American soles (family Achiridae) have been characterized by remarkable chromosomal variation even though several species lack basic cytogenetic information. This trend indicates that chromosomal traits can be useful to taxonomy once the morphological identification of some taxa in this family (e.g., Achirus species) is controversial. In this work, we expand the cytogenetic data in Achiridae by providing the first karyotypic analysis of Achirus achirus. An unusual multiple sex chromosome system (X1X1X2X2/X1X2Y) was detected, once males presented 2n = 33 with three unpaired chromosomes (X1X2Y) while females presented 2n = 34 with two acrocentric pairs (X1X1 and X2X2) found in hemizygosis in males...
September 27, 2016: Zebrafish
Louis W Wang, Inken G Huttner, Celine F Santiago, Diane Fatkin
No abstract text is available yet for this article.
September 27, 2016: Zebrafish
Amina Lebcir, Rahma Hassan-Abdi, Constantin Yanicostas, Nadia Soussi-Yanicostas
No abstract text is available yet for this article.
September 27, 2016: Zebrafish
João Gabriel Santos da Rosa, Heloísa Helena de Alcântara Barcellos, Renan Idalencio, Alessandra Marqueze, Michele Fagundes, Mainara Rossini, Cristiane Variani, Francine Balbinoti, Tássia Michele Huff Tietböhl, Denis Broock Rosemberg, Leonardo José Gil Barcellos
In this study, we show that an adaptation of the spinning test can be used as a model to study the exercise-exhaustion-recovery paradigm in fish. This forced swimming test promotes a wide range of changes in the hypothalamus-pituitary-interrenal axis functioning, intermediary metabolism, as well in fish behavior at both exercise and recovery periods. Our results pointed that this adapted spinning test can be considered a valuable tool for evaluating drugs and contaminant effects on exercised fish. This can be a suitable protocol both to environmental-to evaluate contaminants that act in fish energy mobilization and recovery after stressors-and translational perspectives-effects of drugs on exercised or stressed humans...
September 27, 2016: Zebrafish
Helena Fernandes, Helena Peres, António Paulo Carvalho
A standard diet for zebrafish, based on their specific nutritional requirements, is of primary importance to improve experimental outcomes with this model organism and optimize its large-scale production. However, the main basic nutritional requirements of zebrafish are yet to be determined. This study aimed at contributing to fill this gap by evaluating the dietary protein requirement of zebrafish juvenile. Ten isoenergetic fishmeal-based diets with increasing protein levels (15%-60%) were formulated, and each diet was assigned to duplicated groups of zebrafish (53...
September 19, 2016: Zebrafish
Vasudev Kantae, Elke H J Krekels, Anita Ordas, Oskar González, Rob C van Wijk, Amy C Harms, Peter I Racz, Piet H van der Graaf, Herman P Spaink, Thomas Hankemeier
Zebrafish larvae (Danio rerio) are increasingly used to translate findings regarding drug efficacy and safety from in vitro-based assays to vertebrate species, including humans. However, the limited understanding of drug exposure in this species hampers its implementation in translational research. Using paracetamol as a paradigm compound, we present a novel method to characterize pharmacokinetic processes in zebrafish larvae, by combining sensitive bioanalytical methods and nonlinear mixed effects modeling...
September 15, 2016: Zebrafish
Emily K Don, Isabel Formella, Andrew P Badrock, Thomas E Hall, Marco Morsch, Elinor Hortle, Alison Hogan, Sharron Chow, Serene S L Gwee, Jack J Stoddart, Garth Nicholson, Roger Chung, Nicholas J Cole
Currently there is a lack in fundamental understanding of disease progression of most neurodegenerative diseases, and, therefore, treatments and preventative measures are limited. Consequently, there is a great need for adaptable, yet robust model systems to both investigate elementary disease mechanisms and discover effective therapeutics. We have generated a Tol2 Gateway-compatible toolbox to study neurodegenerative disorders in zebrafish, which includes promoters for astrocytes, microglia and motor neurons, multiple fluorophores, and compatibility for the introduction of genes of interest or disease-linked genes...
September 15, 2016: Zebrafish
Susana S Lopes, Martin Distel, Claudia Linker, Rita Fior, Rui Monteiro, Isaac H Bianco, Ruben Portugues, Uwe Strähle, Leonor Saúde
The European Zebrafish Principal Investigator Meeting (EZPM) is an ideal forum for group leaders using this fantastic animal model not only to discuss science but also to strengthen their interactions, to push forward technological advances, and to define guidelines for the use of this fish in research. The city of Lisbon (Portugal) was voted by the European group leaders to be the setting for the 4th EZPM, and the organizing committee, composed by Leonor Saúde (iMM Lisboa, PT), Susana Lopes (CEDOC, PT), Michael Orger (Champalimaud Foundation, PT), Rui Oliveira (ISPA, PT), and António Jacinto (CEDOC, PT), was very enthusiastic to organize a productive event...
September 14, 2016: Zebrafish
Jeffrey Aalders, Shaukat Ali, Tom J de Jong, Michael K Richardson
In previous publications, we described the population incidence of abnormalities in zebrafish larvae exposed to toxicants. Here, we examine the phenomenon of clustering or co-occurrence of abnormalities in individual larva. Our aim is to see how this clustering can be used to assess the specificity and severity of teratogenic effect. A total of 11,214 surviving larvae, exposed continuously from 1 day postfertilization (dpf) to one of 60 toxicants, were scored at 5 dpf for the presence of eight different abnormal phenotypes...
August 25, 2016: Zebrafish
Bradley S Carter, Christian Cortés-Campos, Xiao Chen, Jasmine M McCammon, Hazel L Sive
Advances in genome-editing technology have made creation of zebrafish mutant lines accessible to the community. Experimental validation of protein knockout is a critical step in verifying null mutants, but this can be a difficult task. Absence of protein can be confirmed by Western blotting; however, this approach requires target-specific antibodies that are generally not available for zebrafish proteins. We address this issue using in vitro translation assays, a fast and standard procedure that can be easily implemented...
August 22, 2016: Zebrafish
Nikki Osborne, Gregory Paull, Adam Grierson, Karen Dunford, Elisabeth M Busch-Nentwich, Lynne U Sneddon, Natalie Wren, Joe Higgins, Penny Hawkins
A meeting on Contemporary Topics in Zebrafish Husbandry and Care was held in the United Kingdom in 2014, with the aim of providing a discussion forum for researchers, animal technologists, and veterinarians from academia and industry to share good practice and exchange ideas. Presentation topics included protocols for optimal larval rearing, implementing the 3Rs (replacement, reduction, and refinement) in large-scale colony management, and environmental enrichment. The audience also participated in a survey of current practice relating to practical husbandry, cryopreservation, and the provision of enrichment...
August 18, 2016: Zebrafish
Xiaoqin Xiong, Si Luo, Benli Wu, Jianwei Wang
Dimethyl sulfoxide (DMSO), a widely used carrier solvent, can be toxic to test organisms and has species-specific sensitivity. In this study, the developmental toxicity and stress protein responses of DMSO to rare minnow (Gobiocypris rarus) and zebrafish (Danio rerio) with two tests were compared in the early life stage. In the first test, fertilized eggs were exposed to 0%, 0.0001%, 0.001%, 0.01%, 0.1%, 1.0%, 1.5%, and 2.0% v/v of DMSO until 3 days post hatching. In the second test, larvae from 0 to 8 d were exposed to 2% DMSO until 4 days...
August 10, 2016: Zebrafish
Giulia Chemello, Chiara Piccinetti, Basilio Randazzo, Oliana Carnevali, Francesca Maradonna, Massimiliano Magro, Emanuela Bonaiuto, Fabio Vianello, Giuseppe Radaelli, Anna Paola Fifi, Federica Gigliotti, Ike Olivotto
Recently, the indiscriminate use of antibiotics in the aquaculture sector has raised public concern because of possible toxic effects, development of bacterial resistance, and accumulation of residues in individual tissues. Even if several countries have developed regulations about their use, it is clear that long-term growth of the aquaculture industry requires both ecologically sound practices and sustainable resource management. Alternative strategies for better management of antibiotic administration are of primary interest to improve absorption rates and, as a consequence, to reduce their release into the aquatic environment...
August 10, 2016: Zebrafish
Emília Rita Szabó, Imola Plangár, Tünde Tőkés, Imola Mán, Róbert Polanek, Róbert Kovács, Gábor Fekete, Zoltán Szabó, Zsolt Csenki, Ferenc Baska, Katalin Hideghéty
This work establishes the zebrafish embryo model for ionizing radiation (IR) modifier research and also evaluates the protective effect of l-alpha glycerylphosphorylcholine (GPC). Embryos were exposed to a single-fraction whole-body gamma irradiation (5, 10, 15, and 20 Gy) at different postfertilization time points and were serially assessed for viability and macro- and micromorphologic abnormalities. After toxicity evaluation, 194 μM of GPC was added for certain groups with 3-h incubation before the radiation...
August 3, 2016: Zebrafish
David J Echevarria, Erika M Caramillo, Francisco Gonzalez-Lima
Methylene blue (MB) is an FDA-grandfathered drug with memory-enhancing effects at low doses, but opposite effects at high doses. We investigated the effects of four MB doses (0.1, 0.5, 5.0, or 10.0 μM) on zebrafish memory retention in the T-maze task. After training fish to swim into a certain arm of the T-maze, the fish were placed into a tank containing one of the four MB doses or a control tank containing blue food dye. Subsequently, fish were placed into the T-maze for memory retention testing. Results indicated that MB produced hormetic dose-response effects on memory...
August 2, 2016: Zebrafish
Bridget B Baker, Jeremiah S Yee, Danielle N Meyer, Doris Yang, Tracie R Baker
We have shown that zebrafish (Danio rerio) are an excellent model for evaluating the link between early life stage exposure to environmental chemicals and disease in adulthood and subsequent unexposed generations. Previously, we used this model to identify transgenerational effects of dioxin (2,3,7,8-tetrachlorodibenzo-p-dioxin [TCDD]) on skeletal development, sex ratio, and reproductive capacity. Transgenerational inheritance of TCDD toxicity, notably decreased reproductive capacity, appears to be mediated through the male germ line...
October 2016: Zebrafish
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