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Domoic acid

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https://www.readbyqxmd.com/read/29887207/morphological-molecular-and-toxigenic-characteristics-of-namibian-pseudo-nitzschia-species-including-pseudo-nitzschia-bucculenta-sp-nov
#1
Frederik Frøsig Gai, Cecilie Kirketerp Hedemand, Deon C Louw, Kolette Grobler, Bernd Krock, Øjvind Moestrup, Nina Lundholm
A field study was undertaken to investigate the occurrence and toxin production of species in the diatom genus Pseudo-nitzschia in Namibian waters, in the extremely productive Benguela upwelling system. From surveys conducted on the R/V Mirabilis and the R/V !Anichab, 52 strains were morphologically determined to species level, supported by nuclear ITS rDNA data. Seven species were identified; P. australis, P. decipiens, P. dolorosa, P. fraudulenta, P. plurisecta, P. pungens var. cingulata, and the new species P...
June 2018: Harmful Algae
https://www.readbyqxmd.com/read/29778221/morphology-and-toxicity-of-pseudo-nitzschia-species-in-the-northern-benguela-upwelling-system
#2
Deon C Louw, Gregory J Doucette, Nina Lundholm
The Benguela upwelling system, considered the world's most productive marine ecosystem, has a long record of potentially toxic diatoms belonging to the genus Pseudo-nitzschia. Species of Pseudo-nitzschia were reported as early as 1936 from the northern Benguela upwelling system (nBUS). For the current study, long-term phytoplankton monitoring data (2004-2011) for the Namibian coast were analysed to examine inshore and offshore temporal distribution of Pseudo-nitzschia species, their diversity and ultrastructure...
May 2018: Harmful Algae
https://www.readbyqxmd.com/read/29767301/capillary-electrophoresis-tandem-mass-spectrometry-for-multiclass-analysis-of-polar-marine-toxins
#3
Daniel G Beach, Elliott S Kerrin, Krista Thomas, Michael A Quilliam, Pearse McCarron
Polar marine toxins are more challenging to analyze by mass spectrometry-based methods than lipophilic marine toxins, which are now routinely measured in shellfish by multiclass reversed-phase liquid chromatography-tandem mass spectrometry (MS/MS) methods. Capillary electrophoresis (CE)-MS/MS is a technique that is well suited for the analysis of polar marine toxins, and has the potential of providing very high resolution separation. Here, we present a CE-MS/MS method developed, with use of a custom-built interface, for the sensitive multiclass analysis of paralytic shellfish toxins, tetrodotoxins, and domoic acid in seafood...
May 16, 2018: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/29674074/fluorescent-microarray-for-multiplexed-quantification-of-environmental-contaminants-in-seawater-samples
#4
Ana Sanchis, J-Pablo Salvador, Katrina Campbell, Christopher T Elliott, Weilin L Shelver, Qing X Li, M-Pilar Marco
The development of a fluorescent multiplexed microarray platform able to detect and quantify a wide variety of pollutants in seawater is reported. The microarray platform has been manufactured by spotting 6 different bioconjugate competitors and it uses a cocktail of 6 monoclonal or polyclonal antibodies raised against important families of chemical pollutants such as triazine biocide (i.e. Irgarol 1051®), sulfonamide and chloramphenicol antibiotics, polybrominated diphenyl ether flame-retardant (PBDE, i.e...
July 1, 2018: Talanta
https://www.readbyqxmd.com/read/29663739/neurotoxic-effects-of-domoic-acid-on-dopaminergic-neurons-in-primary-mesencephalic-cell-culture
#5
Khaled Radad, Mubarak Al-Shraim, Ahmed Al-Emam, Rudolf Moldzio, Wolf-Dieter Rausch
INTRODUCTION: Domoic acid is a potent marine neurotoxin produced by certain species of the diatom genus Pseudonitzschia. To our knowledge, there are no studies that have investigated neurotoxic effects of domoic acid on dopaminergic neurons. Accordingly, the present study was carried out to investigate the potential neurotoxic effects of domoic acid on dopaminergic neurons in primary mesencephalic cell culture. MATERIAL AND METHODS: Cultures prepared from embryonic mouse mesencephala (total of 250 embryos) were treated with different concentrations of domoic acid (0...
2018: Folia Neuropathologica
https://www.readbyqxmd.com/read/29649303/a-new-diatom-species-p-hallegraeffii-sp-nov-belonging-to-the-toxic-genus-pseudo-nitzschia-bacillariophyceae-from-the-east-australian-current
#6
Penelope A Ajani, Arjun Verma, Malwenn Lassudrie, Martina A Doblin, Shauna A Murray
A new species belonging to the toxin producing diatom genus Pseudo-nitzschia, P. hallegraeffii sp. nov., is delineated and described from the East Australian Current (EAC). Clonal cultures were established by single cell isolation from phytoplankton net hauls collected as part of a research expedition in the EAC region in 2016 on the RV Investigator. Cultures were assessed for their morphological and genetic characteristics, their sexual compatibility with other Pseudo-nitzschia species, and their ability to produce domoic acid...
2018: PloS One
https://www.readbyqxmd.com/read/29625197/a-single-subconvulsant-dose-of-domoic-acid-at-mid-gestation-does-not-cause-temporal-lobe-epilepsy-in-mice
#7
Fanny Demars, Kristen Clark, Megan S Wyeth, Emily Abrams, Paul S Buckmaster
Harmful blooms of domoic acid (DA)-producing algae are a problem in oceans worldwide. DA is a potent glutamate receptor agonist that can cause status epilepticus and in survivors, temporal lobe epilepsy. In mice, one-time low-dose in utero exposure to DA was reported to cause hippocampal damage and epileptiform activity, leading to the hypothesis that unrecognized exposure to DA from contaminated seafood in pregnant women can damage the fetal hippocampus and initiate temporal lobe epileptogenesis. However, development of epilepsy (i...
May 2018: Neurotoxicology
https://www.readbyqxmd.com/read/29602502/blurred-lines-multiple-freshwater-and-marine-algal-toxins-at-the-land-sea-interface-of-san-francisco-bay-california
#8
Melissa B Peacock, Corinne M Gibble, David B Senn, James E Cloern, Raphael M Kudela
San Francisco Bay (SFB) is a eutrophic estuary that harbors both freshwater and marine toxigenic organisms that are responsible for harmful algal blooms. While there are few commercial fishery harvests within SFB, recreational and subsistence harvesting for shellfish is common. Coastal shellfish are monitored for domoic acid and paralytic shellfish toxins (PSTs), but within SFB there is no routine monitoring for either toxin. Dinophysis shellfish toxins (DSTs) and freshwater microcystins are also present within SFB, but not routinely monitored...
March 2018: Harmful Algae
https://www.readbyqxmd.com/read/29602500/differential-toxin-response-of-pseudo-nitzschia-multiseries-as-a-function-of-nitrogen-speciation-in-batch-and-continuous-cultures-and-during-a-natural-assemblage-experiment
#9
Regina L Radan, William P Cochlan
The toxigenic diatom Pseudo-nitzschia multiseries Hasle, isolated from the U.S. Pacific Northwest, was examined in unialgal laboratory cultures and in natural assemblages during shipboard experiments, to examine cellular growth and domoic acid (DA) production as a function of nitrogen (N) substrate and availability expected during bloom development and decline. Laboratory experiments utilizing batch cultures conducted at saturating (120 μmol photons m-2  s-1 ) photosynthetic photon flux density (PPFD), demonstrated that P...
March 2018: Harmful Algae
https://www.readbyqxmd.com/read/29547358/investigation-of-a-largescale-common-murre-uria-aalge-mortality-event-in-california-in-2015
#10
Corinne Gibble, Rebecca Duerr, Barbara Bodenstein, Kirsten Lindquist, Jackie Lindsey, Jessie Beck, Laird Henkel, Jan Roletto, Jim Harvey, Raphael Kudela
From August through December 2015, beachcast bird survey programs reported increased deposition of common murres ( Uria aalge) on central and northern California beaches, but not on southern California beaches. Coastal wildlife rehabilitation centers received more than 1,000 live, stranded, and debilitated murres from Sonoma County to San Luis Obispo County during August-October. Approximately two-thirds of admitted birds were after-hatch-year birds in emaciated body condition and in various stages of molt, with extremely worn plumage...
March 16, 2018: Journal of Wildlife Diseases
https://www.readbyqxmd.com/read/29495583/repeated-dietary-exposure-to-low-levels-of-domoic-acid-and-problems-with-everyday-memory-research-to-public-health-outreach
#11
Lynn M Grattan, Carol J Boushey, Yuanyuan Liang, Kathi A Lefebvre, Laura J Castellon, Kelsey A Roberts, Alexandra C Toben, J G Morris
Domoic Acid (DA) is a marine-based neurotoxin. Dietary exposure to high levels of DA via shellfish consumption has been associated with Amnesic Shellfish Poisoning, with milder memory decrements found in Native Americans (NAs) with repetitive, lower level exposures. Despite its importance for protective action, the clinical relevance of these milder memory problems remains unknown. The purpose of this study was to determine whether repeated, lower-level exposures to DA impact everyday memory (EM), i.e., the frequency of memory failures in everyday life...
February 28, 2018: Toxins
https://www.readbyqxmd.com/read/29433033/applying-molecular-modelling-and-experimental-studies-to-develop-molecularly-imprinted-polymer-for-domoic-acid-enrichment-from-both-seawater-and-shellfish
#12
Junjie Ao, Jiaping Gu, Tao Yuan, Dan Li, Yuning Ma, Zhemin Shen
A highly selective sample cleanup method using molecularly imprinted polymers (MIP) was developed for the enrichment of domoic acid (DA, an amnesic shellfish toxin) from both seawater and shellfish samples. Molecular modelling was firstly applied to screening a suitable functional monomer and optimize the polymer preparation. Theoretical results were in a good agreement with those of the experimental studies. MIP was prepared by precipitation polymerization using 1, 3, 5-pentanetricarboxylic acid and 2-(Trifluoromethyl)acrylic acid as the template molecule and functional monomer, respectively...
May 2018: Chemosphere
https://www.readbyqxmd.com/read/29368303/determination-of-domoic-acid-in-plankton-net-samples-from-golden-horn-estuary-turkey-using-hplc-with-fluorescence-detection
#13
Fuat Dursun, Selma Ünlü, Türkan Yurdun
This study focused on the fluctuations of domoic acid (DA) levels in plankton net samples collected from the Golden Horn Estuary (GHE), Turkey, between August 2011 and July 2012. DA concentrations were determined by high-performance liquid chromatography (HPLC), using a fluorenylmethoxycarbonyl (FMOC) derivatization technique. Monthly and biweekly data were evaluated with environmental variables, and their influence on DA production is discussed. DA levels in plankton net samples varied between 0.36 and 94...
January 24, 2018: Bulletin of Environmental Contamination and Toxicology
https://www.readbyqxmd.com/read/29321590/six-domoic-acid-related-compounds-from-the-red-alga-chondria-armata-and-domoic-acid-biosynthesis-by-the-diatom-pseudo-nitzschia-multiseries
#14
Yukari Maeno, Yuichi Kotaki, Ryuta Terada, Yuko Cho, Keiichi Konoki, Mari Yotsu-Yamashita
Domoic acid (DA, 1), a potent neurotoxin that causes amnesic shellfish poisoning, has been found in diatoms and red algae. While biosynthetic pathway towards DA from geranyl diphosphate and L-glutamate has been previously proposed, its late stage is still unclear. Here, six novel DA related compounds, 7'-methyl-isodomoic acid A (2) and B (3), N-geranyl-L-glutamic acid (4), 7'-hydroxymethyl-isodomoic acid A (5) and B (6), and N-geranyl-3(R)-hydroxy-L-glutamic acid (7), were isolated from the red alga, Chondria armata, and their structures were determined...
January 10, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29313078/preparation-and-application-of-a-molecularly-imprinted-monolith-for-specific-recognition-of-domoic-acid
#15
Fan Yang, Ruirui Wang, Guangshui Na, Qilun Yan, Zhongsheng Lin, Zhifeng Zhang
In this work, a molecularly imprinted monolithic column was synthesized by a facile procedure and was applied for specific recognition of domoic acid, an amnesic shellfish poison. The poly(4-vinylpyridine-co-ethylene glycol dimethacrylate) molecularly imprinted monolith was synthesized in a stainless steel column by in situ polymerization. Pentane-1,3,5-tricarboxylic acid was used as a dummy imprinting template instead of the highly toxic and expensive target molecule. It is the first time that a molecularly imprinted monolith is introduced for separation and detection of domoic acid...
February 2018: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/29223596/presence-and-persistence-of-the-amnesic-shellfish-poisoning-toxin-domoic-acid-in-octopus-and-cuttlefish-brains
#16
Vanessa M Lopes, Rui Rosa, Pedro R Costa
Domoic acid (DA) is a neurotoxin that causes degenerative damage to brain cells and induces permanent short-term memory loss in mammals. In cephalopod mollusks, although DA is known to accumulate primarily in the digestive gland, there is no knowledge whether DA reaches their central nervous system. Here we report, for the first time, the presence of DA in brain tissue of the common octopus (Octopus vulgaris) and the European cuttlefish (Sepia officinalis), and its absence in the brains of several squid species (Loligo vulgaris, L...
February 2018: Marine Environmental Research
https://www.readbyqxmd.com/read/29169567/sandwich-hybridization-probes-for-the-detection-of-pseudo-nitzschia-bacillariophyceae-species-an-update-to-existing-probes-and-a-description-of-new-probes
#17
Holly A Bowers, Roman Marin, James M Birch, Christopher A Scholin
New sandwich hybridization assay (SHA) probes for detecting Pseudo-nitzschia species (P. arenysensis, P. fraudulenta, P. hasleana, P. pungens) are presented, along with updated cross-reactivity information on historical probes (SHA and FISH; fluorescence in situ hybridization) targeting P. australis and P. multiseries. Pseudo-nitzschia species are a cosmopolitan group of diatoms that produce varying levels of domoic acid (DA), a neurotoxin that can accumulate in finfish and shellfish and transfer throughout the food web...
December 2017: Harmful Algae
https://www.readbyqxmd.com/read/29150543/toxicokinetics-and-physiologically-based-pharmacokinetic-modeling-of-the-shellfish-toxin-domoic-acid-in-nonhuman-primates
#18
Jing Jing, Rebekah Petroff, Sara Shum, Brenda Crouthamel, Ariel R Topletz, Kimberly S Grant, Thomas M Burbacher, Nina Isoherranen
Domoic acid (DA), a neurotoxin, is produced by marine algae and has caused toxications worldwide in animals and humans. However, the toxicokinetics of DA have not been fully evaluated, and information is missing on the disposition of DA following oral exposures at doses that are considered safe for human consumption. In this study, toxicokinetics of DA were investigated in cynomolgus monkeys following single doses of 5 µ g/kg DA intravenously, 0.075 mg/kg DA orally, and 0.15 mg/kg DA orally. After intravenous dosing, DA had a systemic clearance of 124 ± 71 (ml/h)/kg, volume of distribution at steady state of 131 ± 71 ml/kg and elimination half-life of 1...
February 2018: Drug Metabolism and Disposition: the Biological Fate of Chemicals
https://www.readbyqxmd.com/read/29124474/growth-chain-formation-and-toxin-production-by-southern-brazilian-pseudo-nitzschia-isolates-under-laboratory-conditions
#19
Pedro Rebelo Wadt, Luiz Laureno Mafra, Camila Prestes Dos Santos Tavares, Luciano Felício Fernandes, Luís Antonio de Oliveira Proença
Pseudo-nitzschia is a diatom genus capable of producing the neurotoxin domoic acid (DA), which has been related to mortalities of marine vertebrates, and the amnesic shellfish poisoning (ASP) in human consumers of contaminated bivalves. This study reports DA production among Pseudo-nitzschia strains isolated from shellfish farming areas in southern Brazil. Twenty-seven cultures of potentially toxigenic Pseudo-nitzschia species were established. Growth, stepped-chain formation, and DA production were evaluated in static, intermittently illuminated (12:12 photoperiod) batch cultures for 12 selected strains, and under continuous light and/or turbulence for a single Pseudo-nitzschia calliantha strain...
November 9, 2017: Environmental Monitoring and Assessment
https://www.readbyqxmd.com/read/29122243/the-influence-of-salinity-in-the-domoic-acid-effect-on-estuarine-phytoplankton-communities
#20
Elise Van Meerssche, James L Pinckney
Toxic species of the diatom genus Pseudo-nitzschia, observed worldwide from coastal waters to the open ocean, produce the neurotoxin domoic acid (DA). DA is an important environmental and economic hazard due to shellfish contamination with subsequent effects on higher trophic levels. Previous research has demonstrated that, among other environmental factors, salinity influences the abundance and toxicity of Pseudo-nitzschia. In this study, the environmental factors driving the growth of Pseudo-nitzschia and the production of dissolved DA (dDA) in North Inlet estuary were examined...
November 2017: Harmful Algae
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