keyword
MENU ▼
Read by QxMD icon Read
search

Sea urchin

keyword
https://www.readbyqxmd.com/read/28716299/the-adverse-effects-of-virgin-microplastics-on-the-fertilization-and-larval-development-of-sea-urchins
#1
Concepción Martínez-Gómez, Víctor M León, Susana Calles, Marina Gomáriz-Olcina, A Dick Vethaak
No abstract text is available yet for this article.
June 30, 2017: Marine Environmental Research
https://www.readbyqxmd.com/read/28713368/the-sptransformer-gene-family-formerly-sp185-333-in-the-purple-sea-urchin-and-the-functional-diversity-of-the-anti-pathogen-rsptransformer-e1-protein
#2
REVIEW
L Courtney Smith, Cheng Man Lun
The complex innate immune system of sea urchins is underpinned by several multigene families including the SpTransformer family (SpTrf; formerly Sp185/333) with estimates of ~50 members, although the family size is likely variable among individuals of Strongylocentrotus purpuratus. The genes are small with similar structure, are tightly clustered, and have several types of repeats in the second of two exons and that surround each gene. The density of repeats suggests that the genes are positioned within regions of genomic instability, which may be required to drive sequence diversification...
2017: Frontiers in Immunology
https://www.readbyqxmd.com/read/28712826/induction-of-skeletal-abnormalities-and-autophagy-in-paracentrotus-lividus-sea-urchin-embryos-exposed-to-gadolinium
#3
Chiara Martino, Roberto Chiarelli, Liana Bosco, Maria Carmela Roccheri
Gadolinium (Gd) concentration is constantly increasing in the aquatic environment, becoming an emergent environmental pollutant. We investigated the effects of Gd on Paracentrotus lividus sea urchin embryos, focusing on skeletogenesis and autophagy. We observed a delay of biomineral deposition at 24 hours post fertilization (hpf), and a strong impairment of skeleton growth at 48 hpf, frequently displayed by an asymmetrical pattern. Skeleton growth was found partially resumed in recovery experiments. The mesodermal cells designated to biomineralization were found correctly migrated at 24 hpf, but not at 48 hpf...
July 6, 2017: Marine Environmental Research
https://www.readbyqxmd.com/read/28710864/localized-accumulation-of-cytosolic-calcium-near-the-fused-sperm-is-associated-with-the-calcium-and-voltage-dependent-block-of-sperm-entry-in-the-sea-urchin-egg
#4
Pedro I Ivonnet, Tatsuma Mohri, David H McCulloh
Sperm-egg interaction depolarizes the egg membrane, allowing the sperm to enter; however, if the egg membrane is not allowed to depolarize from its resting potential (e.g. by voltage-clamp), the sperm will not enter. Previous studies demonstrated that sperm entry into sea urchin eggs that are voltage-clamped at negative membrane potentials is regulated both by the egg's membrane potential and a voltage-dependent influx of calcium into the egg. In these cases, electrical or cytoplasmic continuity (sperm-egg membrane fusion) occurs at negative membrane potentials, but subsequent loss of cytoplasmic continuity results in failure of sperm entry (unfusion)...
July 15, 2017: Molecular Reproduction and Development
https://www.readbyqxmd.com/read/28705895/asymmetric-distribution-of-hypoxia-inducible-factor-%C3%AE-regulates-dorsoventral-axis-in-the-early-sea-urchin-embryo
#5
Wei-Lun Chang, Yi-Cheng Chang, Kuan-Ting Lin, Han-Ru Li, Chih-Yu Pai, Jen-Hao Chen, Yi-Hsien Su
Hypoxia signaling is an ancient pathway by which animals can respond to low oxygen. Malfunction of this pathway disturbs the hypoxic acclimation and results in various diseases, including cancers. The role of the hypoxia pathway in early embryogenesis remains unclear. Here, we show that in the sea urchin Strongylocentrotus purpuratus blastula, hypoxia-inducible factor α (HIFα), the downstream transcription factor of this pathway, is localized and transcriptionally active on the future dorsal side. This asymmetric distribution is attributable to its oxygen-sensing ability...
July 13, 2017: Development
https://www.readbyqxmd.com/read/28705630/seasonal-antioxidant-responses-in-the-sea-urchin-paracentrotus-lividus-lamarck-1816-used-as-a-bioindicator-of-the-environmental-contamination-in-the-south-east-mediterranean
#6
Sandra Amri, Mohamed-Faouzi Samar, Fériel Sellem, Kheireddine Ouali
In this study, sea urchin Paracentrotus lividus were sampled seasonally at three stations during 2012 in the coastal areas of the Gulf of Annaba (southeast Mediterranean). For all sea urchins, the gonad index was calculated to determine sea urchin reproductive status. Moreover, a set of biochemical parameters, including biomarkers and oxidative stress parameters, was measured in gonads. The pesticides and physiochemical parameters were measured and dosed in sea water. The results obtained highlighted that the levels of pesticide were generally low and below those commonly applied by environmental quality standards (EQS), indicating that no alarm state is currently present in the Gulf of Annaba...
July 10, 2017: Marine Pollution Bulletin
https://www.readbyqxmd.com/read/28698478/antifungal-and-ichthyotoxic-sesquiterpenoids-from-santalum-album-heartwood
#7
Tae Hoon Kim, Tsutomu Hatano, Keinosuke Okamoto, Takashi Yoshida, Hiroshi Kanzaki, Michiko Arita, Hideyuki Ito
In our continuing study on a survey of biologically active natural products from heartwood of Santalum album (Southwest Indian origin), we newly found potent fish toxic activity of an n-hexane soluble extract upon primary screening using killifish (medaka) and characterized α-santalol and β-santalol as the active components. The toxicity (median tolerance limit (TLm) after 24 h at 1.9 ppm) of α-santalol was comparable with that of a positive control, inulavosin (TLm after 24 h at 1.3 ppm). These fish toxic compounds including inulavosin were also found to show a significant antifungal effect against a dermatophytic fungus, Trichophyton rubrum...
July 8, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28695965/role-of-mad2-expression-during-the-early-development-of-the-sea-urchin
#8
Odile Bronchain, Wael Jdey, Laetitia Caraty, Brigitte Ciapa
Mitotic arrest deficient 2 (Mad2) belongs to the spindle assembly checkpoint (SAC), a mechanism that blocks progression of the cell cycle until microtubule attachment to kinetochores is complete. It has been found to be involved in the resistance of cancer cells to "anti-mitotic" drugs such as paclitaxel. Mad2 controls meiotic progression, but its role during sea urchin development had never been investigated. Furthermore, the existence of a SAC in this species had never been proved. The present data show that a Mad2 protein, highly homologous to that of humans, is expressed in this species...
2017: International Journal of Developmental Biology
https://www.readbyqxmd.com/read/28690785/rates-and-relations-of-mitochondrial-genome-evolution-across-the-echinoidea-with-special-focus-on-the-superfamily-odontophora
#9
Áki Jarl Láruson
In order to better characterize the placement of genus Tripneustes, as a representative of the Toxopneustidae family within the broader sea urchin mitochondrial (MT) phylogeny, the complete MT genome of Tripneustes gratilla was generated and compared with all published echinoid MT genomes currently available on NCBI GenBank. The MT genome phylogeny supports the existence of the superfamily Odontophora (consisting of the families Strongylocentrotidae, Echinometridae, and Toxopneustidae). A relaxed molecular-clock time calibration suggests a split between the three key Odontophore MT lineages occurred during the late Eocene/Oligocene...
July 2017: Ecology and Evolution
https://www.readbyqxmd.com/read/28689711/differential-expression-of-stress-candidate-genes-for-thermal-tolerance-in-the-sea-urchin-loxechinus-albus
#10
Jonathan Vergara-Amado, Andrea X Silva, Catalina Manzi, Roberto F Nespolo, Leyla Cárdenas
Marine ectotherms inhabiting intertidal and shallow subtidal environments are continuously exposed to diurnal tidal cycles and seasonal variability in temperature. These organisms have adaptive mechanisms to maintain cellular homeostasis, irrespective of thermal environmental variation. In this study, we describe the molecular responses to thermal stress in the edible sea urchin Loxechinus albus. In particular, we determined the differential expression of a set of molecular markers that have been identified as targets of stress-related responses...
August 2017: Journal of Thermal Biology
https://www.readbyqxmd.com/read/28689122/different-sizes-of-zno-diversely-affected-the-cytogenesis-of-the-sea-urchin-paracentrotus-lividus
#11
Maria Oliviero, Simona Schiavo, Gabriella Rametta, Maria Lucia Miglietta, Sonia Manzo
Today nanoparticles (NPs) have many applications in commercial products due to their small size and peculiar properties that, conversely, make them potentially toxic for humans and the environment. ZnO NPs are largely used in many personal care products, such as sunscreens and cosmetics. In this study the cytotoxic effects of ZnO particles with different sizes (ZnO Bulk, >100nm; ZnO NPs, 100nm and ZnO NPs, 14nm) upon the first developmental stages of the sea urchin Paracentrotus lividus, are evaluated. Morphological alterations are also assessed by embryotoxicity tests...
July 6, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28684256/new-insights-from-a-high-resolution-look-at-gastrulation-in-the-sea-urchin-lytechinus-variegatus
#12
Megan L Martik, David R McClay
BACKGROUND: Gastrulation is a complex orchestration of movements by cells that are specified early in development. Until now, classical convergent extension was considered to be the main contributor to sea urchin archenteron extension, and the relative contributions of cell divisions were unknown. Active migration of cells along the axis of extension was also not considered as a major factor in invagination. RESULTS: Cell transplantations plus live imaging were used to examine endoderm cell morphogenesis during gastrulation at high-resolution in the optically clear sea urchin embryo...
July 3, 2017: Mechanisms of Development
https://www.readbyqxmd.com/read/28652586/network-model-predicts-that-catsper-is-the-main-ca-2-channel-in-the-regulation-of-sea-urchin-sperm-motility
#13
Jesús Espinal-Enríquez, Daniel Alejandro Priego-Espinosa, Alberto Darszon, Carmen Beltrán, Gustavo Martínez-Mekler
Spermatozoa sea urchin swimming behaviour is regulated by small peptides from the egg outer envelope. Speract, such a peptide, after binding to its receptor in Strongylocentrotus purpuratus sperm flagella, triggers a signaling pathway that culminates with a train of intracellular calcium oscillations, correlated with changes in sperm swimming pattern. This pathway has been widely studied but not fully characterized. Recent work on Arbacia punctulata sea urchin spermatozoa has documented the presence of the Ca(2+) CatSper channel in their flagella and its involvement in chemotaxis...
June 26, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28651191/probing-safety-of-nanoparticles-by-outlining-sea-urchin-sensing-and-signaling-cascades
#14
Andi Alijagic, Annalisa Pinsino
Among currently identified issues presenting risks and benefits to human and ocean health, engineered nanoparticles (ENP) represent a priority. Predictions of their economic and social impact appear extraordinary, but their release in the environment at an uncontrollable rate is in striking contrast with the extremely limited number of studies on environmental impact, especially on the marine environment. The sea urchin has a remarkable sensing environmental system whose function and diversity came into focus during the recent years, after sea urchin genome sequencing...
June 23, 2017: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/28645554/monocrotophos-an-organophosphorus-insecticide-disrupts-the-expression-of-hpnetrin-and-its-receptor-neogenin-during-early-development-in-the-sea-urchin-hemicentrotus-pulcherrimus
#15
Xiaona Zhang, Lei Xu, Hua Tian, Cuicui Wang, Wei Wang, Shaoguo Ru
Netrins, chemotropic guidance cues, can guide the extension of serotonergic axons by binding to netrin receptors during neural development. However, little is known about whether disruption of netrin signaling is involved in the mechanisms by which organophosphorus pesticides affect serotonergic nervous system (SNS) development. In this study, we evaluated the effects of the pesticide monocrotophos (MCP) on the expression patterns of HpNetrin and its receptor neogenin as well as on the intracellular calcium ion (Ca(2+)) levels in Hemicentrotus pulcherrimus (sea urchin) by exposing fertilized embryos to 0, 0...
June 20, 2017: Neurotoxicology
https://www.readbyqxmd.com/read/28636353/synthesis-of-8-substituted-analogues-of-cyclic-adp-4-thioribose-and-their-unexpected-identification-as-ca-2-mobilizing-full-agonists
#16
Satoshi Takano, Takayoshi Tsuzuki, Takashi Murayama, Tomoshi Kameda, Yasuhiro Kumaki, Takashi Sakurai, Hayato Fukuda, Mizuki Watanabe, Mitsuhiro Arisawa, Satoshi Shuto
A series of 8-substituted analogues of cyclic ADP-4-thioribose (cADPtR, 3), which is a stable equivalent of Ca(2+)-mobilizing second messenger cyclic ADP-ribose (cADPR, 1), were designed as potential pharmacological tools for studies on cADPR-modulated Ca(2+) signaling pathways. These 8-amino analogue (8-NH2-cADPtR, 4), 8-azido analogue (8-N3-cADPtR, 5), and 8-chloro analogue (8-Cl-cADPtR, 6) were efficiently synthesized, where the stereoselective N1-β-thioribosyladenine ring closure reaction via an α/β-equilibrium of the 1-aminothioribose derivative and construction of the characteristic 18-membered pyrophosphate ring by Ag(+)-promoted activation of a phenyl phosphorothioate type substrate were the two key steps...
July 3, 2017: Journal of Medicinal Chemistry
https://www.readbyqxmd.com/read/28636231/orchestration-at-the-beginning-mitosis-in-sea-urchin-embryo
#17
Giselle A Abruzzese, Nae Tanpradit, Renata S Tavares
Development of multicellular organisms is driven by a series of mitotic divisions after fertilization. Total cytoplasmic volume does not increase during this process, resulting in an increasing number of smaller daughter cells. Cell divisions are initially synchronous in an early embryo, but this ends at the 16-cell stage in the sea urchin. Orchesterated mitosis does, however, continue in subpopulations via the coordination of two different processes: karyokinesis and cytokinesis. Part of this asynchrony is due to the differentiation of lineages...
June 21, 2017: Molecular Reproduction and Development
https://www.readbyqxmd.com/read/28635649/the-sea-urchin-arbacia-lixula-a-novel-natural-source-of-astaxanthin
#18
Paola Cirino, Christophe Brunet, Martina Ciaravolo, Christian Galasso, Luigi Musco, Tomás Vega Fernández, Clementina Sansone, Alfonso Toscano
Several echinoderms, including sea urchins, are valuable sources of bioactive compounds but their nutraceutical potential is largely unexplored. In fact, the gonads of some sea urchin species contain antioxidants including carotenoids and polyhydroxylated naphthoquinones (PHNQ's), such as echinochrome A. Astaxanthin is known to have particular bioactivity for the prevention of neurodegenerative diseases. This carotenoid is produced by microalgae, while several marine invertebrates can bioaccumulate or synthetize it from metabolic precursors...
June 21, 2017: Marine Drugs
https://www.readbyqxmd.com/read/28629881/cell-mediated-immune-response-of-postmetamorphic-sea-urchin-juveniles-against-infectious-stages-of-diatom-cylindrotheca-closterium-bacillariophyceae
#19
Adriano Magesky, Claude Belzile, Émilien Pelletier
In this study, successive infectious stages by diatom Cylindrotheca closterium (Bacillariophyceae) are described for the first time during the early development of sea urchin at low temperature (8°C). Diatom cell-types enclosed or not by typical theca were capable of infection. As an immune response, red spherulocytes and amoebocytes migrated towards infested areas and restrained the infection spreading over shells in 2- and 3-month old urchins. Only amoebocyte cells appeared to be involved in the immune reaction of 1-month old specimens which turned out to be a less effective fence to stop infestation...
June 16, 2017: Journal of Invertebrate Pathology
https://www.readbyqxmd.com/read/28623689/stage-specific-effects-of-soluble-copper-and-copper-oxide-nanoparticles-during-sea-urchin-embryo-development-and-their-relation-to-intracellular-copper-uptake
#20
Cristina Torres-Duarte, Karla M Ramos-Torres, René Rahimoff, Gary N Cherr
The effects of exposure to either soluble copper (copper sulfate) or copper oxide nanoparticles (nano-CuO) during specific early developmental stages of sea urchin embryos were analyzed. Soluble copper caused significant malformations in embryos (skeletal malformations, delayed development or gut malformations) when present at any given stage, while cleavage stage was the most sensitive to nano-CuO exposure causing skeletal malformations and decreased total antioxidant capacity. The stage specificity was linked to higher endocytic activity during the first hours of development that leads to higher accumulation of copper in specific cells critical for development...
June 1, 2017: Aquatic Toxicology
keyword
keyword
84109
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"