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https://www.readbyqxmd.com/read/28649232/ion-channels-of-pituitary-gonadotrophs-and-their-roles-in-signaling-and-secretion
#1
REVIEW
Stanko S Stojilkovic, Ivana Bjelobaba, Hana Zemkova
Gonadotrophs are basophilic cells of the anterior pituitary gland specialized to secrete gonadotropins in response to elevation in intracellular calcium concentration. These cells fire action potentials (APs) spontaneously, coupled with voltage-gated calcium influx of insufficient amplitude to trigger gonadotropin release. The spontaneous excitability of gonadotrophs reflects the expression of voltage-gated sodium, calcium, potassium, non-selective cation-conducting, and chloride channels at their plasma membrane (PM)...
2017: Frontiers in Endocrinology
https://www.readbyqxmd.com/read/28646163/aldosterone-modulates-the-association-between-ncc-and-enac
#2
Brandi M Wynne, Abinash C Mistry, Otor Al-Khalili, Rickta Mallick, Franziska Theilig, Douglas C Eaton, Robert S Hoover
Distal sodium transport is a final step in the regulation of blood pressure. As such, understanding how the two main sodium transport proteins, the thiazide-sensitive sodium chloride cotransporter (NCC) and the epithelial sodium channel (ENaC), are regulated is paramount. Both are expressed in the late distal nephron; however, no evidence has suggested that these two sodium transport proteins interact. Recently, we established that these two sodium transport proteins functionally interact in the second part of the distal nephron (DCT2)...
June 23, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28644866/the-high-tolerance-to-aluminium-in-crucian-carp-carassius-carassius-is-associated-with-its-ability-to-avoid-hypoxia
#3
Antonio B S Poléo, Joachim Schjolden, Jørgen Sørensen, Göran E Nilsson
It is well known that aluminium is the principle toxicant killing fish in acidified freshwater systems, and it has been shown that crucian carp (Carassius carassius) can survive exposures to aqueous aluminium levels toxic to most other freshwater fish species. The crucian carp has a remarkable ability to survive anoxic conditions, and the aim of the present study was to reveal if the tolerance to aluminium can be associated with the ability to survive prolonged anoxia. Crucian carps were exposed to either acidic Al-rich water (pH 5...
2017: PloS One
https://www.readbyqxmd.com/read/28644688/intraosseous-administration-of-antidotes-a-systematic-review
#4
Audrée Elliott, Pierre-André Dubé, Amélie Cossette-Côté, Laura Patakfalvi, Eric Villeneuve, Martin Morris, Sophie Gosselin
CONTEXT: Intraosseous (IO) access is an established route of administration in resuscitation situations. Patients with serious poisoning presenting to the emergency department may require urgent antidote therapy. However, intravenous (IV) access is not always readily available. OBJECTIVE: This study reviews the current evidence for IO administration of antidotes that could be used in poisoning. The primary outcome was mortality as a surrogate of efficacy. Secondary outcomes included hemodynamic variables, electrocardiographic variables, neurological status, pharmacokinetics outcomes, and adverse effects as defined by each article...
June 23, 2017: Clinical Toxicology
https://www.readbyqxmd.com/read/28644464/a-synthetic-ion-transporter-that-disrupts-autophagy-and-induces-apoptosis-by-perturbing-cellular-chloride-concentrations
#5
Nathalie Busschaert, Seong-Hyun Park, Kyung-Hwa Baek, Yoon Pyo Choi, Jinhong Park, Ethan N W Howe, Jennifer R Hiscock, Louise E Karagiannidis, Igor Marques, Vítor Félix, Wan Namkung, Jonathan L Sessler, Philip A Gale, Injae Shin
Perturbations in cellular chloride concentrations can affect cellular pH and autophagy and lead to the onset of apoptosis. With this in mind, synthetic ion transporters have been used to disturb cellular ion homeostasis and thereby induce cell death; however, it is not clear whether synthetic ion transporters can also be used to disrupt autophagy. Here, we show that squaramide-based ion transporters enhance the transport of chloride anions in liposomal models and promote sodium chloride influx into the cytosol...
July 2017: Nature Chemistry
https://www.readbyqxmd.com/read/28643413/effects-of-sodium-chloride-on-heat-resistance-oxidative-susceptibility-motility-biofilm-and-plaque-formation-of-burkholderia-pseudomallei
#6
Pornpan Pumirat, Muthita Vanaporn, Usa Boonyuen, Nitaya Indrawattana, Amporn Rungruengkitkun, Narisara Chantratita
Burkholderia pseudomallei is an environmental saprophyte and the causative agent of melioidosis, a severe infectious disease prevalent in tropical areas, including southeast Asia and northern Australia. In Thailand, the highest incidence of melioidosis is in the northeast region, where saline soil and water are abundant. We hypothesized that B. pseudomallei develops an ability to thrive in saline conditions and gains a selective ecological advantage over other soil-dwelling microorganisms. However, little is known about how an elevated NaCl concentration affects survival and adaptive changes in this pathogen...
June 23, 2017: MicrobiologyOpen
https://www.readbyqxmd.com/read/28642866/evaluation-of-serum-for-pathophysiological-effects-of-prolonged-low-salinity-water-exposure-in-displaced-bottlenose-dolphins-tursiops-truncatus
#7
Ruth Y Ewing, Blair Mase-Guthrie, Wayne McFee, Forrest Townsend, Charles A Manire, Michael Walsh, Rose Borkowski, Gregory D Bossart, Adam M Schaefer
We conducted a retrospective study of serum biochemistry and hematologic findings from displaced, out-of-habitat bottlenose dolphins (Tursiops truncatus) exposed to various low salinity environments in waters along the southern United States including southeastern Atlantic and northern Gulf of Mexico. Serum sodium, chloride, and calculated osmolality were significantly lower and below reference ranges in displaced animals compared to free-ranging case control animals. This suggests clinical hyponatremia, hypochloremia, and hypo-osmolality due to an uptake of low saline water from the environment...
2017: Frontiers in Veterinary Science
https://www.readbyqxmd.com/read/28642155/uptake-and-desorption-of-hydrophilic-compounds-from-human-stratum-corneum
#8
Matthew A Miller, Fang Yu, Keun-Il Kim, Gerald B Kasting
Small, polar compounds, both ionic and uncharged, partition into human stratum corneum immersed in aqueous solutions to an extent comparable to the water volume fraction of the tissue, then desorb in two phases. The fast phase has a time constant on the order of a few minutes, whereas the slow phase occurs over many hours. A physical model for this behavior involving a combination of tranverse diffusion through the tissue and lateral diffusion and exchange with skin appendages is presented. This concept is probed using excised human stratum corneum exposed to aqueous solutions of radiolabeled sodium chloride, tetraethyl ammonium bromide and mannitol, plus previously published data on six other compounds of varying molecular size and polarity...
June 19, 2017: Journal of Controlled Release: Official Journal of the Controlled Release Society
https://www.readbyqxmd.com/read/28641833/glyoxal-and-methylglyoxal-as-urinary-markers-of-diabetes-determination-using-a-dispersive-liquid-liquid-microextraction-procedure-combined-with-gas-chromatography-mass-spectrometry
#9
M Pastor-Belda, A J Fernández-García, N Campillo, M D Pérez-Cárceles, M Motas, M Hernández-Córdoba, P Viñas
Glyoxal (GO) and methylglyoxal (MGO) are α-oxoaldehydes that can be used as urinary diabetes markers. In this study, their levels were measured using a sample preparation procedure based on salting-out assisted liquid-liquid extraction (SALLE) and dispersive liquid-liquid microextraction (DLLME) combined with gas chromatography-mass spectrometry (GC-MS). The effect of the derivatization reaction with 2,3-diaminonaphthalene, the addition of acetonitrile and sodium chloride to urine, and the DLLME step using the acetonitrile extract as dispersant solvent and carbon tetrachloride as extractant solvent were carefully optimized...
June 16, 2017: Journal of Chromatography. A
https://www.readbyqxmd.com/read/28641222/theoretical-evaluation-on-selective-adsorption-characteristics-of-alkali-metal-based-sorbents-for-gaseous-oxidized-mercury
#10
Hongjian Tang, Yufeng Duan, Chun Zhu, Tianyi Cai, Chunfeng Li, Liang Cai
Alkali metal-based sorbents are potential for oxidized mercury (Hg(2+)) selective adsorption but show hardly effect to elemental mercury (Hg(0)) in flue gas. Density functional theory (DFT) was employed to investigate the Hg(0) and HgCl2 adsorption mechanism over alkali metal-based sorbents, including calcium oxide (CaO), magnesium oxide (MgO), potassium chloride (KCl) and sodium chloride (NaCl). Hg(0) was found to weakly interact with CaO (001), MgO (001), KCl (001) and NaCl (001) surfaces while HgCl2 was effectively adsorbed on top-O and top-Cl sites...
June 12, 2017: Chemosphere
https://www.readbyqxmd.com/read/28638656/crystal-structure-of-2-azido-1-3-bis-2-6-diiso-propyl-phen-yl-1-3-2-di-aza-phospho-lidine
#11
Alex J Veinot, Amber D Blair, Jason D Masuda
The title compound, C26H38N5P, was synthesized by reacting 2-chloro-1,3-bis-(2,6-diiso-propyl-phen-yl)-1,3,2-di-aza-phospho-lidine with sodium azide and a catalytic amount of lithium chloride in tetra-hydro-furan. The title compound is the first structurally characterized 2-azido-1,3,2-di-aza-phospho-lidine and exhibits a P atom in a trigonal pyramidal geometry. The azide P-N bond length of 1.8547 (16) Å is significantly longer than the P-N separations for the chelating di-amine [P-N = 1.6680 (15) and 1...
June 1, 2017: Acta Crystallographica. Section E, Crystallographic Communications
https://www.readbyqxmd.com/read/28637899/dietary-salt-exacerbates-experimental-colitis
#12
Alan L Tubbs, Bo Liu, Troy D Rogers, R Balfour Sartor, Edward A Miao
The Western diet is characterized by high protein, sugar, fat, and low fiber intake, and is widely believed to contribute to the incidence and pathogenesis of inflammatory bowel disease (IBD). However, high sodium chloride salt content, a defining feature of processed foods, has not been considered as a possible environmental factor that might drive IBD. We set out to bridge this gap. We examined murine models of colitis on either a high salt diet (HSD) or a low salt diet. We demonstrate that an HSD exacerbates inflammatory pathology in the IL-10-deficient murine model of colitis relative to mice fed a low salt diet...
June 21, 2017: Journal of Immunology: Official Journal of the American Association of Immunologists
https://www.readbyqxmd.com/read/28633068/multi-electrode-system-for-measurement-of-transmembrane-ion-fluxes-through-living-epithelial-cells
#13
Mirosław Zając, Andrzej Lewenstam, Krzysztof Dolowy
Cystic Fibrosis (CF) is the most common fatal human genetic disease. It is caused by the defect in a single anion channel protein which affects ion and water transport across the epithelial tissue. A flat multi-electrode platform of diameter 12mm, allowing for measurement of four ions: sodium, potassium, hydrogen and chloride by exchangeable/replaceable ion-selective electrodes is described. The measurement is possible owing to the architecture of the platform which accommodates all the electrodes and inlets/outlets...
June 13, 2017: Bioelectrochemistry
https://www.readbyqxmd.com/read/28631789/electrolyte-effect-in-induced-charge-electroosmosis
#14
Huicheng Feng, Yi Huang, Teck Neng Wong, Fei Duan
This paper reports an interesting phenomenon that the velocity increases with increasing sodium chloride (NaCl) concentration in induced charge electroosmosis (ICEO) around a conducting cylinder measured by microparticle image velocimetry (μPIV). It is different from the widely reported velocity decay with increasing electrolyte concentration in AC electroosmosis (ACEO) [M. Z. Bazant et al., MicroTAS, 2007, 2875-2878] and induced charge electrophoresis (ICEP) of Janus particles [S. Gangwal et al., Phys. Rev...
June 20, 2017: Soft Matter
https://www.readbyqxmd.com/read/28631521/on-the-die-compaction-of-powders-used-in-pharmaceutics
#15
G Aryanpour, M Farzaneh
Die compaction is widely used in the compaction of pharmaceutical powders (tableting). It is well known that the powder densification is a result of particle rearrangement and particle deformation. The former is considered to be the governing mechanism of densification in an initial stage of compaction and the latter is regarded as the governing mechanism in the compaction at the higher pressure range. As a more realistic assumption, one can consider that a simultaneous performance of both the rearrangement and deformation mechanisms takes place from the beginning of compaction...
June 20, 2017: Pharmaceutical Development and Technology
https://www.readbyqxmd.com/read/28629035/sodium-alginate-polyvinyl-alcohol-bovin-serum-albumin-coated-fe3o4-nanoparticles-as-anticancer-drug-delivery-vehicle-doxorubicin-loading-and-in-vitro-release-study-and-cytotoxicity-to-hepg2-and-l02-cells
#16
G Prabha, V Raj
The challenging part of this work was to research the potential aspects of sodium alginate (SA)-polyvinyl alcohol (PVA)-bovin serum albumin (BSA) coated Fe3O4 nanoparticles (Fe3O4-SA-PVA-BSA) as a drug delivery system for doxorubicin (DOX). The anticancer drug doxorubicin was selected as a model drug which is powerful for numerous cancer treatments. Superparamagnetic Fe3O4 nanoparticles were prepared by co-precipitation method. The mixture solution of Fe3O4-sodium alginate (SA) - doxorubicin (DOX) was crosslinked with Ca(2+) to form (Fe3O4-SA-DOX) nanoparticles and addition of PVA and BSA with (Fe3O4-SA-DOX) nanoparticles was prepared by coating procedure...
October 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28624453/folic-acid-attenuates-cobalt-chloride-induced-pge2-production-in-huvecs-via-the-no-hif-1alpha-cox-2-pathway
#17
Yuming Liang, Xiaozhou Zhen, Kaiwen Wang, Jing Ma
Prostaglandin E2 (PGE2), an important lipid inflammatory mediator involved in the progression of vascular diseases, can be induced by hypoxia in many cell types. While folic acid has been shown to protect against inflammation in THP-1 cells during hypoxia and hypoxia-induced endothelial cell injury, whether it might do so by attenuating PGE2 production remains unclear. To investigate this we constructed a hypoxia-induced injury model by treating human umbilical vein endothelial cells (HUVECs) with cobalt chloride (CoCl2), which mimics the effects of hypoxia...
June 15, 2017: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/28623473/increasing-the-bile-acid-sequestration-performance-of-cationic-hydrogels-by-using-an-advanced-controlled-polymerization-technique
#18
Patrícia V Mendonça, André Matos, Andreia F Sousa, Arménio C Serra, Sérgio Simões, Jorge F J Coelho
PURPOSE: To investigate the influence of the polymerization technique and the content of hydroxyl groups on the performance of new bile acid sequestrants based on PAMPMTA-co-PHEA (PAMPTMA: poly((3-acrylamidopropyl)trimethylammonium chloride); PHEA: poly(2-hydroxyethyl acrylate)) hydrogels. METHODS: PAMPMTA-co-PHEA hydrogels were prepared using either free radical polymerization or supplemental activator and reducing agent atom transfer radical polymerization. The chemical structure and composition of the hydrogels was confirmed by both FTIR and ssNMR...
June 16, 2017: Pharmaceutical Research
https://www.readbyqxmd.com/read/28621711/indigenous-probiotic-lactobacillus-isolates-presenting-antibiotic-like-activity-against-human-pathogenic-bacteria
#19
Debashis Halder, Manisha Mandal, Shiv Sekhar Chatterjee, Nishith Kumar Pal, Shyamapada Mandal
BACKGROUND: Indigenous lactic acid bacteria are well known probiotics having antibacterial activity against potentially pathogenic bacteria. This study aims to characterize the curd lactobacilli for their probiotic potentiality and antagonistic activity against clinical bacteria. METHODS: Four curd samples were processed microbiologically for the isolation of lactic acid bacteria (LAB). The LAB strains obtained were identified by conventional methods: cultural aspect, gram-staining, biochemical and sugar fermentation tests...
June 16, 2017: Biomedicines
https://www.readbyqxmd.com/read/28620663/reductive-dissolution-of-supergrowth-carbon-nanotubes-for-tougher-nanocomposites-by-reactive-coagulation-spinning
#20
A J Clancy, D B Anthony, S J Fisher, H S Leese, C S Roberts, M S P Shaffer
Long single-walled carbon nanotubes, with lengths >10 μm, can be spontaneously dissolved by stirring in a sodium naphthalide N,N-dimethylacetamide solution, yielding solutions of individualised nanotubide ions at concentrations up to 0.74 mg mL(-1). This process was directly compared to ultrasonication and found to be less damaging while maintaining greater intrinsic length, with increased individualisation, yield, and concentration. Nanotubide solutions were spun into fibres using a new reactive coagulation process, which covalently grafts a poly(vinyl chloride) matrix to the nanotubes directly at the point of fibre formation...
June 16, 2017: Nanoscale
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