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https://www.readbyqxmd.com/read/29793028/cytosolic-distributions-of-highly-toxic-metals-cd-and-tl-and-several-essential-elements-in-the-liver-of-brown-trout-salmo-trutta-l-analyzed-by-size-exclusion-chromatography-and-inductively-coupled-plasma-mass-spectrometry
#1
Zrinka Dragun, Nesrete Krasnići, Nicol Kolar, Vlatka Filipović Marijić, Dušica Ivanković, Marijana Erk
Cytosolic distributions of nonessential metals Cd and Tl and seven essential elements among compounds of different molecular masses were studied in the liver of brown trout (Salmo trutta) from the karstic Krka River in Croatia. Analyses were done by size exclusion high performance liquid chromatography and high resolution inductively coupled plasma mass spectrometry. Common feature of Cd and Tl, as highly toxic elements, was their distribution within only two narrow peaks. The increase of cytosolic Cd concentrations was reflected in marked increase of Cd elution within low molecular mass peak (maximum at ∼15 kDa), presumably containing metallothioneins (MTs), which indicated successful Cd detoxification in brown trout liver under studied exposure conditions...
May 15, 2018: Chemosphere
https://www.readbyqxmd.com/read/29792964/a-family-30-glucurono-xylanase-from-bacillus-subtilis-lc9-expression-characterization-and-its-application-in-chinese-bread-making
#2
Yalan Guo, Zhen Gao, Jiaxing Xu, Siyuan Chang, Bin Wu, Bingfang He
A GH30-8 endoxylanase was identified from an environmental Bacillus subtilis isolate following growth selection on aspen wood glucuronoxylan. The putative endoxylanase was cloned for protein expression and characterization in the Gram-positive protease deficient protein expression host B. subtilis WB800. The extracellular activity obtained was 55 U/mL, which was 14.5-fold higher than that obtained with the native species. The apparent molecular mass of BsXyn30 was estimated as 43 kDa by SDS-PAGE. BsXyn30 showed an optimal activity at pH 7...
May 21, 2018: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/29792923/high-throughput-sequencing-identifies-chilling-responsive-genes-in-sweetpotato-ipomoea-batatas-lam-during-storage
#3
Zeyi Xie, Zhilin Zhou, Hongmin Li, Jingjing Yu, Jiaojiao Jiang, Zhonghou Tang, Daifu Ma, Baohong Zhang, Yonghua Han, Zongyun Li
Sweetpotato (Ipomoea batatas L.) is a globally important economic food crop. It belongs to Convolvulaceae family and origins in the tropics; however, sweetpotato is sensitive to cold stress during storage. In this study, we performed transcriptome sequencing to investigate the sweetpotato response to chilling stress during storage. A total of 110,110 unigenes were generated via high-throughput sequencing. Differentially expressed genes (DEGs) analysis showed that 18,681 genes were up-regulated and 21,983 genes were down-regulated in low temperature condition...
May 21, 2018: Genomics
https://www.readbyqxmd.com/read/29792195/histamine-activates-inflammatory-response-and-depresses-casein-synthesis-in-mammary-gland-of-dairy-cows-during-sara
#4
Guangjun Chang, Lailai Wang, Nana Ma, Wenwen Zhang, Huanmin Zhang, Hongyu Dai, Xiangzhen Shen
BACKGROUND: Mounting evidences observed that subacute ruminal acidosis (SARA) induced by high concentration (HC) diet increases the translocation of histamine from digestive tract into circulation causing a diverse of diseases in dairy cows. However, it is largely unknown how it does affect the function of mammary gland and milk quality. Hence, this study aims to observe the effects of histamine derived from the digestive tract on the inflammatory response and casein synthesis in the mammary glands during SARA...
May 23, 2018: BMC Veterinary Research
https://www.readbyqxmd.com/read/29792156/design-synthesis-and-biological-evaluation-of-1h-1-2-3-triazole-linked-1h%C3%A2-dibenzo-b-h-xanthenes-as-inductors-of-ros-mediated-apoptosis-in-the-breast-cancer-cell-line-mcf-7
#5
Carolina S Bortolot, Luana da S M Forezi, Roberta K F Marra, Marcelo I P Reis, Barbara V F E Sa, Ricardo Imbroisi Filho, Zeinab Ghasemishahrestani, Mauro Sola-Penna, Patricia Zancan, Vitor F Ferreira, Fernando de C da Silva
BACKGROUND: Low molecular weight 1,2,3-triazoles and naphthoquinones are endowed with various types of biological activity, such as against cancer, HIV and bacteria. However, in some cases, the conjugation of these two nuclei considerably increases their biological activities Objective: In this work, we decided to study the synthesis and screening of bis-naphthoquinones and xanthenes tethered to 1,2,3-triazoles against cancer cell lines, specifically the human breast cancer cell line MCF-7...
May 23, 2018: Medicinal Chemistry
https://www.readbyqxmd.com/read/29792155/design-synthesis-and-investigation-of-new-diphenyl-substituted-pyridazinone-derivatives-as-both-cholinesterase-and-a%C3%AE-aggregation-inhibitors
#6
Burcu Kilic, Merve Erdogan, Hayrettin O Gulcan, Fatma Aksakal, Nihan Oruklu, E Umit Bagriacik, Deniz S Dogruer
Backround: With respect to the increase in the average life expectancy, Alzheimer Disease (AD), the most common form of age-related dementia, has become a major threat to the population over the age of 65 during the past several decades. The majority of AD treatments are focused on cholinergic and amyloid hypotheses. OBJECTIVE: In this study, three series of diphenyl-2-(2-(4-substitutedpiperazin-1-yl)ethyl)pyridazin-3(2H)-one derivatives were designed, synthesized and investigated for their ability to inhibit both cholinesterase enzymes and amyloid-β aggregation...
May 23, 2018: Medicinal Chemistry
https://www.readbyqxmd.com/read/29792031/the-composition-in-the-interface-between-clay-mineral-surfaces-and-divalent-cation-electrolytes
#7
Stanislav Jelavić, A Rath Nielsen, S L S Stipp, N Bovet
The interfacial free energy of a solid, which determines its adsorption properties, depends on interactions between the surface and the fluid. A change in surface composition can completely change the behaviour of the solid. Decades of work have explored adsorption and its effects at solid-fluid interfaces from the macroscopic perspective and using molecular modelling so the concept of the electric double layer (EDL) is well established in the community. However, direct, molecular level, experimental observations of the composition within the interface region, and its change with time and conditions, is not abundant...
May 23, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/29791949/the-global-neurological-burden-of-tuberculosis
#8
Kiran Thakur, Mitashee Das, Kelly E Dooley, Amita Gupta
Central nervous system (CNS) involvement of tuberculosis (TB) is the most severe manifestation of TB and accounts for approximately 5 to 10% of all extrapulmonary TB (EPTB) cases and approximately 1% of all TB cases. TB meningitis (TBM) is the most common form of CNS TB, though other forms occur, often in conjunction with TBM, including intracranial tuberculomas, tuberculous brain abscesses, and spinal tubercular arachnoiditis. CNS TB often presents with nonspecific clinical features that mimic symptoms of other neurological conditions, often making diagnosis difficult...
April 2018: Seminars in Neurology
https://www.readbyqxmd.com/read/29791776/polymorphism-in-disease-related-apolipoprotein-c-ii-amyloid-fibrils-a-structural-model-for-rod-like-fibrils
#9
Courtney O Zlatic, Yu Mao, Nevena Todorova, Yee-Foong Mok, Geoffrey J Howlett, Irene Yarovsky, Paul R Gooley, Michael D W Griffin
Human apolipoprotein (apo) C-II is one of several plasma apolipoproteins that form amyloid deposits in vivo and is an independent risk factor for cardiovascular disease. Lipid-free apoC-II readily self-assembles into twisted-ribbon amyloid fibrils but forms straight, rod-like amyloid fibrils in the presence of low concentrations of micellar phospholipids. Charge mutations exerted significantly different effects on rod-like fibril formation compared to their effects on twisted-ribbon fibril formation. For instance, the double mutant K30D, D69K apoC-II readily formed twisted-ribbon fibrils, while the rate of rod-like fibril formation in the presence of micellar phospholipid was negligible...
May 23, 2018: FEBS Journal
https://www.readbyqxmd.com/read/29791608/hiv-1-genetic-diversity-and-resistance-to-antiretroviral-drugs-among-pregnant-women-in-ribeir%C3%A3-o-preto-sp-brazil-cross-sectional-study
#10
Ana Teresa Mancini Pimenta, Isadora Alonso Correa, Patricia Pereira Dos Santos Melli, Renata Abduch, Geraldo Duarte, José Carlos Couto-Fernandez, Silvana Maria Quintana
BACKGROUND: Increasing genetic diversity of HIV-1 and emergence of drug-resistant mutations may reduce the efficacy of antiretroviral therapy and prophylaxis that are used to prevent mother-to-child transmission. The aim of this study was to assess the genetic diversity and prevalence of drug-resistant mutations among HIV-infected pregnant women. DESIGN AND SETTING: Cross-sectional study at an outpatient clinic for infectious diseases within gynecology and obstetrics...
March 2018: São Paulo Medical Journal, Revista Paulista de Medicina
https://www.readbyqxmd.com/read/29791257/the-use-of-direct-oral-anticoagulants-in-the-treatment-of-acute-venous-thromboembolism-in-cancer-patients
#11
Hikmat Abdel-Razeq, Antoine Finianos, Ali T Taher
Introduction - After the CLOT study, LMWHs (low-molecular weight heparins) have gradually replaced warfarin as the treatment of choice for VTE (venous thromboembolism) in cancer patients. Randomized controlled studies comparing DOACs (direct oral anticoagulants) to LMWHs in cancer patients are still limited. However, new emerging data are supporting the use of DOACs in cancer-associated thrombosis. Areas Covered - This review will discuss the recent studies that addressed the utilization of such agents in the treatment of VTE in cancer patients...
May 23, 2018: Expert Review of Hematology
https://www.readbyqxmd.com/read/29791154/high-precision-megahertz-to-terahertz-dielectric-spectroscopy-of-protein-collective-motions-and-hydration-dynamics
#12
Ali Charkhesht, Chola Regmi, Katie R Mitchell-Koch, Shengfeng Cheng, Nguyen Q Vinh
The low-frequency collective vibrational modes in proteins as well as the protein-water interface have been suggested as dominant factors controlling the efficiency of biochemical reactions and biological energy transport. It is thus crucial to uncover the mystery of hydration structure and dynamics as well as their coupling to collective motions of proteins in aqueous solutions. Here we report dielectric properties of aqueous BSA protein solutions as a model system using an extremely sensitive dielectric spectrometer with frequencies spanning from megahertz to terahertz...
May 23, 2018: Journal of Physical Chemistry. B
https://www.readbyqxmd.com/read/29791050/a-novel-clcn5-pathogenic-mutation-supports-dent-disease-with-normal-endosomal-acidification
#13
Yohan Bignon, Alexi Alekov, Nadia Frachon, Olivier Lahuna, Carine Jean-Baptiste Doh-Egueli, Georges Deschênes, Rosa Vargas-Poussou, Stéphane Lourdel
Dent disease in an X-linked recessive renal tubular disorder characterized by low-molecular-weight proteinuria, hypercalciuria, nephrolithiasis, nephrocalcinosis and progressive renal failure. Inactivating mutations of CLCN5, the gene encoding the 2Cl- /H+ exchanger ClC-5 have been reported in patients with Dent disease 1. In vivo studies in mice harboring an artificial mutation in the "gating glutamate" of ClC-5 (c.632A > C, p.Glu211Ala) and mathematical modeling suggest that endosomal chloride concentration could be an important parameter in endocytosis, rather than acidification as earlier hypothesized...
May 23, 2018: Human Mutation
https://www.readbyqxmd.com/read/29790938/the-low-threshold-calcium-channel-cav3-2-mediates-burst-firing-of-mature-dentate-granule-cells
#14
Mael Dumenieu, Oleg Senkov, Andrey Mironov, Emmanuel Bourinet, Michael R Kreutz, Alexander Dityatev, Martin Heine, Arthur Bikbaev, Jeffrey Lopez-Rojas
Mature granule cells are poorly excitable neurons that were recently shown to fire action potentials, preferentially in bursts. It is believed that the particularly pronounced short-term facilitation of mossy fiber synapses makes granule cell bursting a very effective means of properly transferring information to CA3. However, the mechanism underlying the unique bursting behavior of mature granule cells is currently unknown. Here, we show that Cav3.2 T-type channels at the axon initial segment are responsible for burst firing of mature granule cells in rats and mice...
April 18, 2018: Cerebral Cortex
https://www.readbyqxmd.com/read/29790687/expression-profiles-of-selected-genes-in-tumors-and-matched-surgical-margins-in-oral-cavity-cancer-do-we-have-to-pay-attention-to-the-molecular-analysis-of-the-surgical-margins
#15
Joanna K Strzelczyk, Łukasz Krakowczyk, Karolina Gołąbek, Aleksander J Owczarek
BACKGROUND: Head and neck squamous cell carcinomas (HNSCCs) are associated with an interplay between genetics and the environment; they account for 3% of all diagnosed malignant tumors in men and 2% of those in women. OBJECTIVES: The aim of the study was to analyze the significance of TIMP3, SFRP1, SFRP2, CDH1, RASSF1, RORA, and DAPK1 gene expression in head and neck squamous cell carcinoma tumors, and in matching surgical margin samples. We also analyzed the association between clinical parameters and the expression of the selected genes...
April 24, 2018: Advances in Clinical and Experimental Medicine: Official Organ Wroclaw Medical University
https://www.readbyqxmd.com/read/29790657/from-low-to-high-pathogenicity-characterization-of-h7n7-avian-influenza-viruses-in-two-epidemiologically-linked-outbreaks
#16
Klaas Dietze, Annika Graaf, Timo Homeier-Bachmann, Christian Grund, Leonie Forth, Anne Pohlmann, Christa Jeske, Mattis Wintermann, Martin Beer, Franz J Conraths, Timm Harder
The ability of low pathogenic (LP) avian influenza viruses (AIV) of the subtypes H5 and H7 to mutate spontaneously to highly pathogenic (HP) variants is the main reason for their stringent control. On-the-spot evidence from the field of mutations in LPAIV to render the virus into nascent HP variants is scarce. Epidemiological investigations and molecular characterization of two spatiotemporally linked outbreaks caused by LP, and subsequently, HPAIV H7N7 in two-layer farms in Germany yielded such evidence. The outbreaks occurred within 45 days on farms 400 m apart...
May 23, 2018: Transboundary and Emerging Diseases
https://www.readbyqxmd.com/read/29790645/fibrinogen-prothrombin-time-derived-method-is-not-useful-in-patients-anticoagulated-with-low-molecular-weight-heparins-or-rivaroxaban
#17
C Duboscq, M Martinuzzo, J M Ceresetto, M Lopez, L Barrera, J Oyhamburu, G Stemmelin
BACKGROUND: Fibrinogen prothrombin time derived method (FIBPT-d) with photo-optical coagulometers is easy and economical. However, there are few reports on the behavior of this test on samples from patients anticoagulated with direct oral anticoagulants (DOACs) or low molecular weight heparin (LMWH). OBJECTIVE: To compare fibrinogen results obtained by Clauss method (FIB C) and FIBPT-d with two thromboplastins in anticoagulated patients. POPULATION: 295 consecutive anticoagulated patients: 99 vitamin K antagonist (VKA), 49 unfractionated heparin (UFH), 47 LMWH, 50 rivaroxaban and 50 dabigatran; and 100 healthy controls (NC)...
May 23, 2018: Journal of Thrombosis and Haemostasis: JTH
https://www.readbyqxmd.com/read/29790574/investigations-on-velvet-regulatory-mutants-confirm-the-role-of-host-tissue-acidification-and-secretion-of-proteins-in-the-pathogenesis-of-botrytis-cinerea
#18
Nathalie Müller, Michaela Leroch, Julia Schumacher, David Zimmer, Anne Könnel, Klaus Klug, Thomas Leisen, David Scheuring, Frederik Sommer, Timo Mühlhaus, Michael Schroda, Matthias Hahn
The Botrytis cinerea VELVET complex regulates light-dependent development and virulence. The goal of this study was to identify common virulence defects of several VELVET mutants and to reveal their molecular basis. Growth, differentiation, physiology, gene expression and infection of fungal strains were analyzed, and quantitative comparisons of in planta transcriptomes and secretomes were performed. VELVET mutants showed reduced release of citric acid, the major acid secreted by the wild-type, whereas no significant role for oxalic acid was observed...
May 23, 2018: New Phytologist
https://www.readbyqxmd.com/read/29790499/mass-spectrometric-detection-of-iron-nitrosyls-sulfide-oxidation-and-mycothiolation-during-nitrosylation-of-the-no-sensor-4fe-4s-nsrr
#19
Jason C Crack, Chris J Hamilton, Nick E Le Brun
The bacterial nitric oxide (NO)-sensing transcriptional regulator NsrR binds a [4Fe-4S] cluster that enables DNA-binding and thus repression of the cell's NO stress response. Upon exposure to NO, the cluster undergoes a complex nitrosylation reaction resulting in a mixture of iron-nitrosyl species, which spectroscopic studies have indicated are similar to well characterized low molecular weight dinitrosyl iron complex (DNIC), Roussin's Red Ester (RRE) and Roussin's Black Salt (RBS). Here we report mass spectrometric studies that enable the unambiguous identification of NsrR-bound RRE-type species, including a persulfide bound form that results from the oxidation of cluster sulfide...
May 23, 2018: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/29790343/main-group-catalyzed-reductive-alkylation-of-multiply-substituted-amines-with-aldehydes-using-h-2
#20
Yoichi Hoshimoto, Takuya Kinoshita, Sunit Hazra, Masato Ohashi, Sensuke Ogoshi
Given the growing demand for green and sustainable chemical processes, the catalytic reductive alkylation of amines with main-group catalysts of low toxicity and molecular hydrogen as the reductant would be an ideal method to functionalize amines. However, such a process remains challenging. Herein, a novel reductive alkylation system using H2 is presented, which proceeds via a tandem reaction that involves the B(2,6-Cl2 C6 H3 )( p-HC6 F4 )2 -catalyzed formation of an imine, and the subsequent hydrogenation of this imine catalyzed by a frustrated Lewis pair (FLP)...
May 23, 2018: Journal of the American Chemical Society
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