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https://www.readbyqxmd.com/read/28530472/telomerase-expression-in-medaka-oryzias-melastigma-pharyngeal-teeth
#1
W H Tan, P E Witten, C Winkler, D W T Au, A Huysseune
Nonmammalian vertebrates have the capacity of lifelong tooth replacement. In all vertebrates, tooth formation requires contact and interaction between the oral or pharyngeal epithelium and the underlying mesenchyme. To secure lifelong replacement, the presence of odontogenic stem cells has been postulated, particularly in the epithelial compartment. This study uses an advanced teleost fish species, the marine medaka Oryzias melastigma, a close relative to Oryzias latipes, to examine the expression and distribution of telomerase reverse transcriptase (Tert), the catalytic unit of telomerase, in developing pharyngeal teeth and to relate these data to the proliferative activity of the cells...
June 2017: Journal of Dental Research
https://www.readbyqxmd.com/read/28529176/impairment-of-antioxidant-mechanisms-in-japanese-medaka-oryzias-latipes-by-acute-exposure-to-aluminum
#2
Wilson F Ramírez-Duarte, Tomofumi Kurobe, Swee J Teh
Increasing aluminum (Al) concentrations in aquatic habitats as a result of anthropogenic acidification and industrialization is a global issue. Moreover, in extensive areas of the humid tropics and subtropics, high Al concentrations in freshwater are observed because of both naturally low pH and high Al concentrations in soil. Al increases production of reactive oxygen species and enhances oxidative damage in mammals. However, no studies have examined the effect of environmentally relevant concentrations of Al at low pH on oxidative stress in fish...
May 18, 2017: Comparative Biochemistry and Physiology. Toxicology & Pharmacology: CBP
https://www.readbyqxmd.com/read/28500182/upr-transducer-bbf2h7-allows-export-of-type-ii-collagen-in-a-cargo-and-developmental-stage-specific-manner
#3
Tokiro Ishikawa, Takuya Toyama, Yuki Nakamura, Kentaro Tamada, Hitomi Shimizu, Satoshi Ninagawa, Tetsuya Okada, Yasuhiro Kamei, Tomoko Ishikawa-Fujiwara, Takeshi Todo, Eriko Aoyama, Masaharu Takigawa, Akihiro Harada, Kazutoshi Mori
The unfolded protein response (UPR) handles unfolded/misfolded proteins accumulated in the endoplasmic reticulum (ER). However, it is unclear how vertebrates correctly use the total of ten UPR transducers. We have found that ER stress occurs physiologically during early embryonic development in medaka fish and that the smooth alignment of notochord cells requires ATF6 as a UPR transducer, which induces ER chaperones for folding of type VIII (short-chain) collagen. After secretion of hedgehog for tissue patterning, notochord cells differentiate into sheath cells, which synthesize type II collagen...
May 12, 2017: Journal of Cell Biology
https://www.readbyqxmd.com/read/28484741/effects-of-clove-oil-and-lidocaine-hcl-anesthesia-on-water-parameter-during-simulated-transportation-in-the-marine-medaka-oryzias-dancena
#4
In-Seok Park, Hyun Woo Gil, Tae Ho Lee, Yoon Kwon Nam, Sang Gu Lim, Dong Soo Kim
Optimum concentrations of anesthetic clove oil and anesthetic lidocaine-HCl were determined for a species of adult marine medaka, Oryzias dancena, over a range of salinity conditions, and investigated in a transport simulation experiment by analyzing various water and physiological parameters. Research indicated that the higher the concentration of anesthetic at each salinity, the shorter the anesthesia time at each salinity. At each concentration, fish were anesthetized slower at water salinities over 10 ppt (P<0...
March 2017: Balsaeng'gwa Saengsig
https://www.readbyqxmd.com/read/28482225/immunostaining-of-uva-induced-dna-damage-in-erythrocytes-of-medaka-oryzias-latipes
#5
Alaa El-Din Hamid Sayed, Hiroshi Mitani
Some authors have recently reported that UVA induces double-strand breaks (DSBs) in DNA. Only a few researchers have reported on the induction of DSBs upon UVA exposure, as measured using the Comet assay and γ-H2AX as markers of DSB formation. In the present study, we have investigated for the first time the dose-dependent induction of DSBs by UVA in medaka (Oryzias latipes) erythrocytes. Adult female medaka fish were exposed to UVA for 15, 30, and 60min/day for three continuous days; an unirradiated control group was kept in the same laboratory conditions...
April 28, 2017: Journal of Photochemistry and Photobiology. B, Biology
https://www.readbyqxmd.com/read/28476577/utility-of-quantitative-micro-computed-tomographic-analysis-in-zebrafish-to-define-gene-function-during-skeletogenesis
#6
Julia F Charles, Meera Sury, Kelly Tsang, Katia Urso, Katrin Henke, Yue Huang, Ruby Russell, Jeffrey Duryea, Matthew P Harris
The zebrafish is a powerful experimental model to investigate the genetic and morphologic basis of vertebrate development. Analysis of skeletogenesis in this fish is challenging as a result of the small size of the developing and adult zebrafish. Many of the bones of small fishes such as the zebrafish and medaka are quite thin, precluding many standard assays of bone quality and morphometrics commonly used on bones of larger animals. Microcomputed tomography (microCT) is a common imaging technique used for detailed analysis of the skeleton of the zebrafish and determination of mutant phenotypes...
May 2, 2017: Bone
https://www.readbyqxmd.com/read/28463727/sound-production-in-japanese-medaka-oryzias-latipes-and-its-alteration-by-exposure-to-aldicarb-and-copper-sulfate
#7
Ik Joon Kang, Xuchun Qiu, Junya Moroishi, Yuji Oshima
This study is the first to report sound production in Japanese medaka (Oryzias latipes). Sound production was affected by exposure to the carbamate insecticide (aldicarb) and heavy-metal compound (copper sulfate). Medaka were exposed at four concentrations (aldicarb: 0, 0.25, 0.5, and 1 mg L(-1); copper sulfate: 0, 0.5, 1, and 2 mg L(-1)), and sound characteristics were monitored for 5 h after exposure. We observed constant average interpulse intervals (approx 0.2 s) in all test groups before exposure, and in the control groups throughout the experiment...
April 20, 2017: Chemosphere
https://www.readbyqxmd.com/read/28460293/an-innovative-and-integrative-assay-for-toxicity-testing-using-individual-fish-embryos-application-to-oxazepam
#8
Philippine Granger Joly de Boissel, Patrice Gonzalez, Audrey Buleté, Guillemine Daffe, Christelle Clérandeau, Emmanuelle Vulliet, Jérôme Cachot
This paper describes the development of an integrative embryo-toxicity assay in Japanese medaka allowing analysis of several toxicological endpoints together in a same individual. In this assay, embryos are topically exposed, and survival, hatching success, malformations, biometry, behaviour, and target gene expression are subsequently analysed in each individual. This assay was applied to oxazepam, an anxiolytic pharmaceutical compound currently found in wastewater treatment plant effluent. Even if oxazepam accumulation in embryos was very low, it caused spinal and cardiac malformations, delayed growth, erratic swimming and deregulation of genes involved in apoptosis, DNA repair and mitochondrial metabolism...
April 17, 2017: Chemosphere
https://www.readbyqxmd.com/read/28448912/effects-of-low-levels-of-ultraviolet-radiation-on-antioxidant-mechanisms-of-japanese-medaka-oryzias-latipes
#9
Wilson F Ramírez-Duarte, Tomofumi Kurobe, Swee J Teh
Extreme weather events like drought are expected to increase with climate change, which will increase exposure of freshwater fish to ultraviolet (UV) radiation. Compared to fully grown adult fish, fish in early life stages are more susceptible to UV radiation due to the lack of well-developed pigmentation. Even though several studies have described affectation of fish health after exposure to UV radiation, most of the studies have used intensities that are only found on the surface of the earth crust or at shallow depths in water bodies, and little is known about impacts of weaker UV radiation, which can be found in deep water...
April 20, 2017: Chemosphere
https://www.readbyqxmd.com/read/28432496/reproductive-effects-of-life-cycle-exposure-to-difenoconazole-on-female-marine-medaka-oryzias-melastigma
#10
Xiaocui Dong, Zhenghong Zuo, Jiaojiao Guo, Hongbin Li, Lemeng Zhang, Meng Chen, Zhibin Yang, Chonggang Wang
Difenoconazole (DFZ) is a widely used triazole fungicide which has been detected in some estuaries and embayments. This study was conducted to investigate the effects of DFZ on ovarian development in female marine medaka (Oryzias melastigma). After 180 days exposure of the embryo to DFZ (0, 1, 10, 100 and 1000 ng/L), the gonadosomatic index and percentage of mature oocytes produced were significantly reduced in the 1, 10 and 100 ng/L treatments but not the 1000 ng/L treatment compared to the control, thus exhibiting a U-shaped dose response curve...
April 21, 2017: Ecotoxicology
https://www.readbyqxmd.com/read/28428060/effects-of-chronic-ammonia-exposure-on-ammonia-metabolism-and-excretion-in-marine-medaka-oryzias-melastigma
#11
Na Gao, Limei Zhu, Zhiqiang Guo, Meisheng Yi, Li Zhang
Ammonia is highly toxic to aquatic organisms, but whether ammonia excretion or ammonia metabolism to less toxic compounds is the major strategy for detoxification in marine fish against chronic ammonia exposure is unclear to date. In this study, we investigated the metabolism and excretion of ammonia in marine medaka Oryzias melastigma during chronic ammonia exposure. The fish were exposed to 0, 0.1, 0.3, 0.6, and 1.1 mmol l(-1) NH4Cl spiked seawater for 8 weeks. Exposure of 0.3-1.1 mmol l(-1) NH4Cl had deleterious effects on the fish, including significant reductions in growth, feed intake, and total protein content...
April 18, 2017: Fish & Shellfish Immunology
https://www.readbyqxmd.com/read/28416325/involvement-of-the-nuclear-progestin-receptor-in-lh-induced-expression-of-membrane-type-2-matrix-metalloproteinase-required-for-follicle-rupture-during-ovulation-in-the-medaka-oryzias-latipes
#12
Katsueki Ogiwara, Takayuki Takahashi
Hormonal regulation of the expression of Mmp15, a proteolytic enzyme indispensable for ovulation in the teleost medaka, was investigated. In an in vitro culture system using preovulatory follicles, Mmp15 expression and ovulation were induced in the presence of recombinant luteinizing hormone (rLh). Both rLh-induced Mmp15 expression and ovulation were 17α, 20β-dihydroxy-4-pregnen-3-one-dependent, suggesting the involvement of a nuclear progestin receptor (Pgr). In vitro follicle ovulation and Mmp15 expression were reduced by treatment with the Pgr antagonist RU-486...
April 14, 2017: Molecular and Cellular Endocrinology
https://www.readbyqxmd.com/read/28411468/nine-co-localized-cytochrome-p450-genes-of-the-cyp2n-cyp2ad-and-cyp2p-gene-families-in-the-mangrove-killifish-kryptolebias-marmoratus-genome-identification-and-expression-in-response-to-b-%C3%AE-p-bpa-op-and-np
#13
Jayesh Puthumana, Bo-Mi Kim, Chang-Bum Jeong, Duck-Hyun Kim, Hye-Min Kang, Jee-Hyun Jung, Il-Chan Kim, Un-Ki Hwang, Jae-Seong Lee
The CYP2 genes are the largest and most diverse cytochrome P450 (CYP) subfamily in vertebrates. We have identified nine co-localized CYP2 genes (∼55kb) in a new cluster in the genome of the highly resilient ecotoxicological fish model Kryptolebias marmoratus. Molecular characterization, temporal and tissue-specific expression pattern, and response to xenobiotics of these genes were examined. The CYP2 gene clusters were characterized and designated CYP2N22-23, CYP2AD12, and CYP2P16-20. Gene synteny analysis confirmed that the cluster in K...
June 2017: Aquatic Toxicology
https://www.readbyqxmd.com/read/28399163/three-dimensional-computer-graphic-animations-for-studying-social-approach-behaviour-in-medaka-fish-effects-of-systematic-manipulation-of-morphological-and-motion-cues
#14
Tomohiro Nakayasu, Masaki Yasugi, Soma Shiraishi, Seiichi Uchida, Eiji Watanabe
We studied social approach behaviour in medaka fish using three-dimensional computer graphic (3DCG) animations based on the morphological features and motion characteristics obtained from real fish. This is the first study which used 3DCG animations and examined the relative effects of morphological and motion cues on social approach behaviour in medaka. Various visual stimuli, e.g., lack of motion, lack of colour, alternation in shape, lack of locomotion, lack of body motion, and normal virtual fish in which all four features (colour, shape, locomotion, and body motion) were reconstructed, were created and presented to fish using a computer display...
2017: PloS One
https://www.readbyqxmd.com/read/28383254/distribution-bioaccumulation-trophic-transfer-and-influences-of-ceo2-nanoparticles-in-a-constructed-aquatic-food-web
#15
Xingchen Zhao, Miao Yu, Dan Xu, Aifeng Liu, Xingwang Hou, Fang Hao, Yanmin Long, Qunfang Zhou, Guibin Jiang
In view of the final destination of nanomaterials, the water system would be an important sink. However, the environmental behavior of nanomaterials is rather confusing due to the complexity of the real environment. In this study, a freshwater ecosystem, including water, sediment, water lettuce, water silk, Asian clams, snails, water fleas, Japanese medaka, and Yamato shrimp, was constructed to study the distribution, bioaccumulation, and potential impacts of CeO2 nanoparticles (CeO2 NPs) via long-term exposure...
April 17, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28379677/windows-of-susceptibility-and-consequences-of-early-life-exposures-to-17%C3%AE-estradiol-on-medaka-oryzias-latipes-reproductive-success
#16
Crystal S D Lee Pow, Kedamawit Tilahun, Kari Creech, J Mac Law, W Gregory Cope, Thomas J Kwak, James A Rice, D Derek Aday, Seth W Kullman
Estrogens and estrogen mimics are commonly found in surface waters and are associated with deleterious effects in fish populations. Impaired fertility and fecundity in fish following chronic exposures to estrogens and estrogen mimics during critical windows in development are well documented. However, information regarding differential reproductive effects of exposure within defined developmental stages remains sparse. In this study, reproductive capacity was assessed in Japanese medaka (Oryzias latipes) after exposure to two concentrations of 17β-estradiol (E2β; 2 ng/L and 50 ng/L) during four distinct stages of development: gonad development, gonad differentiation, development of secondary sex characteristics (SSC) and gametogenesis...
April 20, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28371886/chemical-and-physical-guidance-of-fish-spermatozoa-into-the-egg-through-the-micropyle%C3%A2-%C3%A2
#17
Ryuzo Yanagimachi, Tatsuo Harumi, Hajime Matsubara, Wei Yan, Shuiqiao Yuan, Noritaka Hirohashi, Tomohiro Iida, Etsuro Yamaha, Katsutoshi Arai, Takahiro Matsubara, Tadashi Andoh, Carol Vines, Gary N Cherr
Eggs of teleost fish, unlike those of many other animals, allow sperm entry only at a single site, a narrow canal in the egg's chorion called the micropyle. In some fish (e.g., flounder, herring, and Alaska pollock), the micropyle is a narrow channel in the chorion, with or without a shallow depression around the outer opening of micropyle. In some other fish (e.g., salmon, pufferfish, cod, and medaka), the micropyle is like a funnel with a conical opening. Eggs of all the above fish have a glycoprotein tightly bound to the chorion surface around the micropyle...
April 1, 2017: Biology of Reproduction
https://www.readbyqxmd.com/read/28370873/three-urocortins-in-medaka-identification-and-spatial-expression-in-the-central-nervous-system
#18
Kohei Hosono, Junpei Yamashita, Yukiko Kikuchi, Towako Hiraki-Kajiyama, Kataaki Okubo
The urocortin (UCN) group of neuropeptides includes urocortin 1/sauvagine/urotensin 1 (UTS1), urocortin 2 (UCN2), and urocortin 3 (UCN3). In recent years, evidence has accumulated showing that UCNs play pivotal roles in mediating stress response and anxiety in mammals. Evidence has also emerged regarding the evolutionary conservation of UCNs in vertebrates, but very little information is available about UCNs in non-mammalian vertebrates. In fact, at present, there are no reports of the empirical identification of ucn2 in non-mammalian vertebrates or of the distribution of ucn2 and ucn3 expression in the adult central nervous system (CNS) of these animals...
March 30, 2017: Journal of Neuroendocrinology
https://www.readbyqxmd.com/read/28351739/identification-characterization-and-functional-analysis-of-regulatory-region-of-nanos-gene-from-half-smooth-tongue-sole-cynoglossus-semilaevis
#19
Jinqiang Huang, Yongjuan Li, Changwei Shao, Na Wang, Songlin Chen
The nanos gene encodes an RNA-binding zinc finger protein, which is required in the development and maintenance of germ cells. However, there is very limited information about nanos in flatfish, which impedes its application in fish breeding. In this study, we report the molecular cloning, characterization and functional analysis of the 3'-untranslated region of the nanos gene (Csnanos) from half-smooth tongue sole (Cynoglossus semilaevis), which is an economically important flatfish in China. The 1233-bp cDNA sequence, 1709-bp genomic sequence and flanking sequences (2...
June 20, 2017: Gene
https://www.readbyqxmd.com/read/28347744/the-development-of-cellular-immune-defence-in-marine-medaka-oryzias-melastigma
#20
Frauke Seemann, Drew Ryan Peterson, Michael Wai Lun Chiang, Doris Wai Ting Au
Environmentally induced alterations of the immune system during sensitive developmental stages may manifest as abnormalities in immune organ configuration and/or immune cell differentiation. These not only render the early life stages more vulnerable to pathogens, but may also affect the adult immune competence. Knowledge of these sensitive periods in fish would provide an important prognostic/diagnostic tool for aquatic risk assessment of immunotoxicants. The marine medaka Oryzias melastigma is an emerging seawater fish model for immunotoxcology...
March 24, 2017: Comparative Biochemistry and Physiology. Toxicology & Pharmacology: CBP
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