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https://www.readbyqxmd.com/read/28618356/developmental-neurotoxic-effects-of-graphene-oxide-exposure-in-zebrafish-larvae-danio-rerio
#1
J C Soares, Tcb Pereira, K M Costa, T Maraschin, N R Basso, M R Bogo
Although graphene oxide (GO), a nanomaterial with hexagonal planar layer, has been widely studied due to its applications in neurobiology that include drug delivery and tissue engineering, additional studies to assess its potential toxic effects are still needed. Thus, this study evaluated the effects of GO exposure (at 5, 10, 50 or 100mg/L) during six consecutive days on mortality, hatching, spontaneous movement, heart rate, morphology, locomotion behavior, acetylcholinesterase (AChE) activity, dopamine levels and relative gene expression of developmental neurology-related genes using zebrafish larvae...
June 3, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/28617866/characterization-of-trace-metal-content-in-the-developing-zebrafish-embryo
#2
Rebecca T Thomason, Michael A Pettiglio, Carolina Herrera, Clara Kao, Jonathan D Gitlin, Thomas B Bartnikas
Trace metals are essential for health but toxic when present in excess. The maintenance of trace metals at physiologic levels reflects both import and export by cells and absorption and excretion by organs. The mechanism by which this maintenance is achieved in vertebrate organisms is incompletely understood. To explore this, we chose zebrafish as our model organism, as they are amenable to both pharmacologic and genetic manipulation and comprise an ideal system for genetic screens and toxicological studies...
2017: PloS One
https://www.readbyqxmd.com/read/28608514/cone-signals-in-monostratified-and-bistratified-amacrine-cells-of-adult-zebrafish-retina
#3
M M Torvund, T S Ma, V P Connaughton, F Ono, R F Nelson
No abstract text is available yet for this article.
August 15, 2017: Journal of Comparative Neurology
https://www.readbyqxmd.com/read/28589943/the-signalling-receptor-mcam-coordinates-apical-basal-polarity-and-planar-cell-polarity-during-morphogenesis
#4
Qian Gao, Junfeng Zhang, Xiumei Wang, Ying Liu, Rongqiao He, Xingfeng Liu, Fei Wang, Jing Feng, Dongling Yang, Zhaoqing Wang, Anming Meng, Xiyun Yan
The apical-basal (AB) polarity and planar cell polarity (PCP) provide an animal cell population with different phenotypes during morphogenesis. However, how cells couple these two patterning systems remains unclear. Here we provide in vivo evidence that melanoma cell adhesion molecule (MCAM) coordinates AB polarity-driven lumenogenesis and c-Jun N-terminal kinase (JNK)/PCP-dependent ciliogenesis. We identify that MCAM is an independent receptor of fibroblast growth factor 4 (FGF4), a membrane anchor of phospholipase C-γ (PLC-γ), an immediate upstream receptor of nuclear factor of activated T-cells (NFAT) and a constitutive activator of JNK...
June 7, 2017: Nature Communications
https://www.readbyqxmd.com/read/28587808/retinoic-acid-prevents-synaptic-deficiencies-induced-by-alcohol-exposure-during-gastrulation-in-zebrafish-embryos
#5
J Ferdous, R Mukherjee, K T Ahmed, D W Ali
In this study, we examined the effects of alcohol exposure during gastrulation on zebrafish embryos, specifically focusing on excitatory synaptic activity associated with neurons (Mauthner cells) that are born during gastrulation. Furthermore, we determined whether co-treatment of alcohol and retinoic acid (RA) could prevent the effects of alcohol exposure during gastrulation. We exposed zebrafish embryos to ethanol (150mM), RA (1nM), or a combination of RA (1nM) plus ethanol (150mM) for 5.5h from 5.25h post fertilization (hpf) to 10...
June 3, 2017: Neurotoxicology
https://www.readbyqxmd.com/read/28579318/the-zebrafish-kidney-mutant-zeppelin-reveals-that-brca2-fancd1-is-essential-for-pronephros-development
#6
Paul T Kroeger, Bridgette E Drummond, Rachel Miceli, Michael McKernan, Gary F Gerlach, Amanda N Marra, Annemarie Fox, Kristen K McCampbell, Ignaty Leshchiner, Adriana Rodriguez-Mari, Ruth BreMiller, Ryan Thummel, Alan J Davidson, John Postlethwait, Wolfram Goessling, Rebecca A Wingert
The zebrafish kidney is conserved with other vertebrates, making it an excellent genetic model to study renal development. The kidney collects metabolic waste using a blood filter with specialized epithelial cells known as podocytes. Podocyte formation is poorly understood but relevant to many kidney diseases, as podocyte injury leads to progressive scarring and organ failure. zeppelin (zep) was isolated in a forward screen for kidney mutants and identified as a homozygous recessive lethal allele that causes reduced podocyte numbers, deficient filtration, and fluid imbalance...
June 1, 2017: Developmental Biology
https://www.readbyqxmd.com/read/28548928/crosstalk-between-tongue-carcinoma-cells-extracellular-vesicles-and-immune-cells-in-in-vitro-and-in-vivo-models
#7
Ahmed Al-Samadi, Shady Adnan Awad, Katja Tuomainen, Yue Zhao, Abdelhakim Salem, Mataleena Parikka, Tuula Salo
The crosstalk between immune cells, cancer cells, and extracellular vesicles (EVs) secreted by cancer cells remains poorly understood. We created three-dimensional (3D) cell culture models using human leiomyoma discs and Myogel to study the effects of immune cells on highly (HSC-3) and less (SCC-25) invasive oral tongue squamous cell carcinoma (OTSCC) cell lines. Additionally, we studied the effects of EVs isolated from these cell lines on the cytotoxicity of CD8+ T and NK cells isolated from three healthy donors...
May 10, 2017: Oncotarget
https://www.readbyqxmd.com/read/28526573/transcriptomic-variation-of-locally-infected-skin-of-epinephelus-coioides-reveals-the-mucosal-immune-mechanism-against-cryptocaryon-irritans
#8
Yazhou Hu, Anxing Li, Yang Xu, Biao Jiang, Geling Lu, Xiaochun Luo
Fish skin is the largest immunologically active mucosal organ, providing first-line defense against external pathogens. However, the skin-associated immune mechanisms of fish are still unclear. Cryptocaryon irritans is an obligate ectoparasitic ciliated protozoan that infects almost all marine fish, and is believed to be an excellent pathogen model to study fish mucosal immunity. In this study, a de novo transcriptome assembly of Epinephelus coioides skin post C. irritans tail-infection was performed for the first time using the Illumina HiSeq™ 2500 system...
May 17, 2017: Fish & Shellfish Immunology
https://www.readbyqxmd.com/read/28524544/enzymatic-engineering-of-live-bacterial-cell-surfaces-using-butelase%C3%A2-1
#9
Xiaobao Bi, Juan Yin, Giang K T Nguyen, Chang Rao, Nurashikin Bte Abdul Halim, Xinya Hemu, James P Tam, Chuan-Fa Liu
Butelase-mediated ligation (BML) can be used to modify live bacterial cell surfaces with diverse cargo molecules. Surface-displayed butelase recognition motif NHV was first introduced at the C-terminal end of the anchoring protein OmpA on E. coli cells. This then served as a handle of BML for the functionalization of E. coli cell surfaces with fluorescein and biotin tags, a tumor-associated monoglycosylated peptide, and mCherry protein. The cell-surface ligation reaction was achieved at low concentrations of butelase and the labeling substrates...
June 26, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28518092/isolation-of-the-side-population-in-myc-induced-t-cell-acute-lymphoblastic-leukemia-in-zebrafish
#10
Margaret M Pruitt, Wilfredo Marin, Michael R Waarts, Jill L O de Jong
Heterogeneous cell populations, from either healthy or malignant tissues, may contain a population of cells characterized by a differential ability to efflux the DNA-binding dye Hoechst 33342. This "side population" of cells can be identified using flow cytometric methods after the Hoechst 33342 dye is excited by an ultraviolet (UV) laser. The side population of many cell types contains stem- or progenitor-like cells. However, not all cell types have an identifiable side population. Danio rerio, zebrafish, have a robust in vivo model of T-cell acute lymphoblastic leukemia (T-ALL), but whether these zebrafish T-ALLs have a side population is unknown...
May 4, 2017: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/28475237/production-of-zebrafish-cardiospheres-and-cardiac-progenitor-cells-in-vitro-and-three-dimensional-culture-of-adult-zebrafish-cardiac-tissue-in-scaffolds
#11
Wendy R Zeng, Siew-Joo Beh, Robert J Bryson-Richardson, Pauline M Doran
The hearts of adult zebrafish (Danio rerio) are capable of complete regeneration in vivo even after major injury, making this species of particular interest for understanding the growth and differentiation processes required for cardiac tissue engineering. To date, little research has been carried out on in vitro culture of adult zebrafish cardiac cells. In this work, progenitor-rich cardiospheres suitable for cardiomyocyte differentiation and myocardial regeneration were produced from adult zebrafish hearts...
May 5, 2017: Biotechnology and Bioengineering
https://www.readbyqxmd.com/read/28460050/ift81-as-a-candidate-gene-for-nonsyndromic-retinal-degeneration
#12
Rachayata Dharmat, Wei Liu, Zhongqi Ge, Zixi Sun, Lizhu Yang, Yumei Li, Keqing Wang, Kandace Thomas, Ruifang Sui, Rui Chen
Purpose: IFT81, a core component of the IFT-B complex, involved in the bidirectional transport of ciliary proteins, has been recently implicated in syndromic ciliopathies. However, none of the IFT-B core complex proteins have been associated with nonsyndromic retinal dystrophies. Given the importance of ciliary transport in photoreceptor function and structural maintenance, we sought to investigate the impact of IFT (intraflagellar transport) mutations in nonsyndromic retinopathies. Methods: Whole exome sequencing was performed on 50 cone-rod dystrophy (CRD) patients that were previously screened for mutations in known retinal disease genes...
May 1, 2017: Investigative Ophthalmology & Visual Science
https://www.readbyqxmd.com/read/28436959/peptide-mhc-based-nanomedicines-for-autoimmunity-function-as-t-cell-receptor-microclustering-devices
#13
Santiswarup Singha, Kun Shao, Yang Yang, Xavier Clemente-Casares, Patricia Solé, Antonio Clemente, Jesús Blanco, Qin Dai, Fayi Song, Shang Wan Liu, Jun Yamanouchi, Channakeshava Sokke Umeshappa, Roopa Hebbandi Nanjundappa, Pascal Detampel, Matthias Amrein, César Fandos, Robert Tanguay, Susan Newbigging, Pau Serra, Anmar Khadra, Warren C W Chan, Pere Santamaria
We have shown that nanoparticles (NPs) can be used as ligand-multimerization platforms to activate specific cellular receptors in vivo. Nanoparticles coated with autoimmune disease-relevant peptide-major histocompatibility complexes (pMHC) blunted autoimmune responses by triggering the differentiation and expansion of antigen-specific regulatory T cells in vivo. Here, we define the engineering principles impacting biological activity, detail a synthesis process yielding safe and stable compounds, and visualize how these nanomedicines interact with cognate T cells...
April 24, 2017: Nature Nanotechnology
https://www.readbyqxmd.com/read/28416692/immunomodulation-accelerated-neuronal-regeneration-following-selective-rod-photoreceptor-cell-ablation-in-the-zebrafish-retina
#14
David T White, Sumitra Sengupta, Meera T Saxena, Qingguo Xu, Justin Hanes, Ding Ding, Hongkai Ji, Jeff S Mumm
Müller glia (MG) function as inducible retinal stem cells in zebrafish, completely repairing the eye after damage. The innate immune system has recently been shown to promote tissue regeneration in which classic wound-healing responses predominate. However, regulatory roles for leukocytes during cellular regeneration-i.e., selective cell-loss paradigms akin to degenerative disease-are less well defined. To investigate possible roles innate immune cells play during retinal cell regeneration, we used intravital microscopy to visualize neutrophil, macrophage, and retinal microglia responses to induced rod photoreceptor apoptosis...
May 2, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28398466/novel-nesprin-1-mutations-associated-with-dilated-cardiomyopathy-cause-nuclear-envelope-disruption-and-defects-in-myogenesis
#15
Can Zhou, Chen Li, Bin Zhou, Huaqin Sun, Victoria Koullourou, Ian Holt, Megan J Puckelwartz, Derek T Warren, Robert Hayward, Ziyuan Lin, Lin Zhang, Glenn E Morris, Elizabeth M McNally, Sue Shackleton, Li Rao, Catherine M Shanahan, Qiuping Zhang
Nesprins-1 and -2 are highly expressed in skeletal and cardiac muscle and together with SUN (Sad1p/UNC84)-domain containing proteins and lamin A/C form the LInker of Nucleoskeleton-and-Cytoskeleton (LINC) bridging complex at the nuclear envelope (NE). Mutations in nesprin-1/2 have previously been found in patients with autosomal dominant Emery-Dreifuss muscular dystrophy (EDMD) as well as dilated cardiomyopathy (DCM). In this study, three novel rare variants (R8272Q, S8381C and N8406K) in the C-terminus of the SYNE1 gene (nesprin-1) were identified in seven DCM patients by mutation screening...
June 15, 2017: Human Molecular Genetics
https://www.readbyqxmd.com/read/28397687/a-metabolic-switch-controls-intestinal-differentiation-downstream-of-adenomatous-polyposis-coli-apc
#16
Imelda T Sandoval, Richard Glenn C Delacruz, Braden N Miller, Shauna Hill, Kristofor A Olson, Ana E Gabriel, Kevin Boyd, Christeena Satterfield, Holly Van Remmen, Jared Rutter, David A Jones
Elucidating signaling pathways that regulate cellular metabolism is essential for a better understanding of normal development and tumorigenesis. Recent studies have shown that mitochondrial pyruvate carrier 1 (MPC1), a crucial player in pyruvate metabolism, is downregulated in colon adenocarcinomas. Utilizing zebrafish to examine the genetic relationship between MPC1 and Adenomatous polyposis coli (APC), a key tumor suppressor in colorectal cancer, we found that apc controls the levels of mpc1 and that knock down of mpc1 recapitulates phenotypes of impaired apc function including failed intestinal differentiation...
April 11, 2017: ELife
https://www.readbyqxmd.com/read/28382297/candida-parapsilosis-protects-premature-intestinal-epithelial-cells-from-invasion-and-damage-by-candida-albicans
#17
Sara Gonia, Linda Archambault, Margaret Shevik, Marie Altendahl, Emily Fellows, Joseph M Bliss, Robert T Wheeler, Cheryl A Gale
Candida is a leading cause of late-onset sepsis in premature infants and is thought to invade the host via immature or damaged epithelial barriers. We previously showed that the hyphal form of Candida albicans invades and causes damage to premature intestinal epithelial cells (pIECs), whereas the non-hyphal Candida parapsilosis, also a fungal pathogen of neonates, has less invasion and damage abilities. In this study, we investigated the potential for C. parapsilosis to modulate pathogenic interactions of C...
2017: Frontiers in Pediatrics
https://www.readbyqxmd.com/read/28375163/triazole-fungicides-inhibit-zebrafish-hatching-by-blocking-the-secretory-function-of-hatching-gland-cells
#18
Javiera F De la Paz, Natalia Beiza, Susana Paredes-Zúñiga, Misque S Hoare, Miguel L Allende
In animals, hatching represents the transition point from a developing embryo to a free-living individual, the larva. This process is finely regulated by many endogenous and environmental factors and has been shown to be sensitive to a variety of chemical agents. It is commonly evaluated in bioassays in order to establish the effects of different agents on early development and reproductive capabilities in fish and other aquatic animals. In fish, the breakdown of the chorion is achieved by the secretion of choriolysin by hatching gland cells (HGCs) into the perivitelline space (PVS), coupled with spontaneous movements of the developing larva...
April 4, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/28366621/rescue-of-pink1-deficiency-by-stress-dependent-activation-of-autophagy
#19
Yuxi Zhang, David T Nguyen, Ellen M Olzomer, Gin P Poon, Nicholas J Cole, Anita Puvanendran, Brigitte R Phillips, Daniel Hesselson
Stimulating autophagy is a promising therapeutic strategy for slowing the progression of neurodegenerative disease. Neurons are insensitive to current approaches based on mTOR inhibition for activating autophagy, and instead may rely on the Parkinson's disease-associated proteins PINK1 and PARKIN to activate the autophagy-lysosomal pathway in response to mitochondrial damage. We developed a multifactorial zebrafish drug-screening platform combining Pink1 deficiency with an environmental toxin to compromise mitochondrial function and trigger dopaminergic neuron loss...
April 20, 2017: Cell Chemical Biology
https://www.readbyqxmd.com/read/28365195/zebrafish-foxp3-is-required-for-the-maintenance-of-immune-tolerance
#20
Kotaro Sugimoto, Subhra P Hui, Delicia Z Sheng, Maki Nakayama, Kazu Kikuchi
Regulatory T (Treg) cells play a central role in the suppression of excessive immune responses against both self and non-self antigens. The development and function of Treg cells are controlled by a master regulatory gene encoding the forkhead box P3 (FOXP3) protein in mammals. However, little is known regarding the functions of Treg cells and FOXP3 in non-mammalian vertebrates. In this study, we generated mutant zebrafish lacking a functional FOXP3 ortholog, and demonstrated a significant reduction in survival accompanied by a marked increase in inflammatory gene expression, mononuclear cell infiltration, and T cell proliferation in peripheral tissues...
March 30, 2017: Developmental and Comparative Immunology
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