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https://www.readbyqxmd.com/read/28226457/forecasting-nanoparticle-toxicity-using-nonlinear-predictive-regressor-learning-systems
#1
N Toschi, S Ciulli, S Diciotti, A Duggento, M Guerrisi, A Magrini, L Campagnolo, A Pietroiusti, N Toschi, S Ciulli, S Diciotti, A Duggento, M Guerrisi, A Magrini, L Campagnolo, A Pietroiusti, M Guerrisi, S Ciulli, L Campagnolo, S Diciotti, A Magrini, A Pietroiusti, A Duggento, N Toschi
Nanoparticle (NP) toxicity is determined by a vast number of topological, sterical, physico-chemical as well as biological properties, rendering a priori evaluation of the effect of NP on biological tissue as arduous as it is necessary and urgent. We aimed at mining the HORIZON 2020 MODENA COST NP cytotoxicity database through nonlinear predictive regressor learning systems in order to assess the power of available NP descriptors and assay characteristics in predicting NP toxicity. Specifically, we assessed the results of cytotoxicity assays performed on 57 NP and trained two different nonlinear regressors (Support Vector Regressors [SVR] with polynomical kernels and Radial Basis Function [RBF] regressors) within a nested-cross validation scheme for parameter optimization to predict toxicity as quantified by EC25, EC50 and slope while using the regressional ReliefF algorithm (RReliefF) for feature selection...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28226247/biologically-active-filters-an-advanced-water-treatment-process-for-contaminants-of-emerging-concern
#2
Shuangyi Zhang, Stephen W Gitungo, Lisa Axe, Robert F Raczko, John E Dyksen
With the increasing concern of contaminants of emerging concern (CECs) in source water, this study examines the hypothesis that existing filters in water treatment plants can be converted to biologically active filters (BAFs) to treat these compounds. Removals through bench-scale BAFs were evaluated as a function of media, granular activated carbon (GAC) and dual media, empty bed contact time (EBCT), and pre-ozonation. For GAC BAFs, greater oxygen consumption, increased pH drop, and greater dissolved organic carbon removal normalized to adenosine triphosphate (ATP) were observed indicating increased microbial activity as compared to anthracite/sand dual media BAFs...
February 7, 2017: Water Research
https://www.readbyqxmd.com/read/28225814/e-npp3-controls-plasmacytoid-dendritic-cell-numbers-in-the-small-intestine
#3
Yoki Furuta, Shih-Han Tsai, Makoto Kinoshita, Kosuke Fujimoto, Ryu Okumura, Eiji Umemoto, Yosuke Kurashima, Hiroshi Kiyono, Hisako Kayama, Kiyoshi Takeda
Extracellular adenosine 5'-triphosphate (ATP) performs multiple functions including activation and induction of apoptosis of many cell types. The ATP-hydrolyzing ectoenzyme ecto-nucleotide pyrophosphatase/phosphodiesterase 3 (E-NPP3) regulates ATP-dependent chronic allergic responses by mast cells and basophils. However, E-NPP3 is also highly expressed on epithelial cells of the small intestine. In this study, we showed that E-NPP3 controls plasmacytoid dendritic cell (pDC) numbers in the intestine through regulation of intestinal extracellular ATP...
2017: PloS One
https://www.readbyqxmd.com/read/28225751/lower-cystic-fibrosis-transmembrane-conductance-regulator-cftr-promotes-the-proliferation-and-migration-of-endometrial-carcinoma
#4
Xian Xia, Jie Wang, Yuan Liu, Ming Yue
BACKGROUND The incidence and death rates of endometrial cancer are alarmingly increasing. The diagnosis and treatment of endometrial cancer is crucial to decreasing mortality. Cystic fibrosis transmembrane conductance regulator (CFTR) belongs to the adenosine triphosphate (ATP)-binding cassette transporter family and plays an essential role in anion regulation and tissue homeostasis of various epithelia. This study explored the expression of CFTR in endometrial carcinoma and the role of CFTR in proliferation and migration of endometrial carcinoma cells...
February 22, 2017: Medical Science Monitor: International Medical Journal of Experimental and Clinical Research
https://www.readbyqxmd.com/read/28225598/novel-aptasensor-platform-based-on-ratiometric-surface-enhanced-raman-spectroscopy
#5
Yan Wu, Fubing Xiao, Zhaoyang Wu, Ruqin Yu
A novel aptasensor platform has been developed for quantitative detection of adenosine triphosphate (ATP) based on a ratiometric surface-enhanced Raman scattering (SERS) strategy. The thiolated 3'-Rox-labeled complementary DNA (cDNA) is first immobilized on the gold nanoparticle (AuNP) surface and then hybridizes with the 3'-Cy5-labeled ATP-binding aptamer probe (Cy5-aptamer) to form a rigid double-stranded DNA (dsDNA), in which the Cy5 and Rox Raman labels are used to produce the ratiometric Raman signals...
February 22, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28224106/impact-of-high-dose-vitamin-c-on-platelet-function
#6
Bassem M Mohammed, Kimberly W Sanford, Bernard J Fisher, Erika J Martin, Daniel Contaifer, Urszula Osinska Warncke, Dayanjan S Wijesinghe, Charles E Chalfant, Donald F Brophy, Alpha A Fowler Iii, Ramesh Natarajan
AIM: To examine the effect of high doses of vitamin C (VitC) on ex vivo human platelets (PLTs). METHODS: Platelet concentrates collected for therapeutic or prophylactic transfusions were exposed to: (1) normal saline (control); (2) 0.3 mmol/L VitC (Lo VitC); or (3) 3 mmol/L VitC (Hi VitC, final concentrations) and stored appropriately. The VitC additive was preservative-free buffered ascorbic acid in water, pH 5.5 to 7.0, adjusted with sodium bicarbonate and sodium hydroxide...
February 4, 2017: World Journal of Critical Care Medicine
https://www.readbyqxmd.com/read/28223679/synthesis-and-ability-of-new-ligands-for-g-protein-coupled-receptors-17-gpr17
#7
Tongyou Zhuo, Shengxue Zhou, Wei Zhang, Catia Lambertucci, Rosaria Volpini
GPR17 is believed to be a novel target for the development of new therapeutic approaches to human stroke and multiple sclerosis. Hence, the selection of GPR17 ligands may be a potent way to reduce the progression of ischemic damage. New potential ligands for GPR17, mono-, di-, and triphosphate adenosine nucleotides substituted at N6-position with a methyl and a cyclopentyl group were synthesized. The ability of new ligands to bind GPR17 was evaluated using frontal affinity chromatography-mass spectrometry (FAC-MS) method...
February 22, 2017: Medical Science Monitor: International Medical Journal of Experimental and Clinical Research
https://www.readbyqxmd.com/read/28222598/drastic-compensation-of-the-electronic-and-solvation-effects-on-the-atp-hydrolysis-revealed-through-a-large-scale-qm-mm-simulations-combined-with-a-theory-of-solutions
#8
Hideaki Takahashi, Satoru Umino, Yuji Miki, Ryosuke Ishizuka, Shu Maeda, Akihiro Morita, Makoto Suzuki, Nobuyuki Matubayasi
Hydrolysis of adenosine triphosphate (ATP) is the "energy source" for a variety of biochemical processes. In the present work, we address key features of ATP hydrolysis: the relatively moderate value (about -10 kcal/mol) of the standard free energy ΔGhyd of reaction and the insensitivity of ΔGhyd to the number of excess electrons on ATP. We conducted quantum mechanical/molecular mechanical (QM/MM) simulation combined with the energy-representation theory of solutions to analyze the electronic-state and solvation contributions to ΔGhyd...
February 21, 2017: Journal of Physical Chemistry. B
https://www.readbyqxmd.com/read/28221021/probing-cellular-molecules-with-polya-based-engineered-aptamer-nanobeacon
#9
Lizhen Chen, Jie Chao, Xiangmeng Qu, Hongbo Zhang, Dan Zhu, Shao Su, Ali Aldalbahi, Lianhui Wang, Hao Pei
Adenosine triphosphate (ATP) is a central metabolite that is of critical importance in many cellular processes. The development of sensitive and selective methods for the detection of ATP level in vivo is crucial in diagnostic and theranostic applications. In this work, we have developed a polyA-based aptamer nanobeacon (PAaptNB) with improved efficiency and speed of ATP analysis. We found that the dissociation constants and competitive binding kinetics of the PAaptNB could be programmably regulated by adjusting the polyA length...
February 21, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28220904/recent-advances-in-occupational-and-environmental-health-hazards-of-workers-exposed-to-gasoline-compounds
#10
REVIEW
Christopher E Ekpenyong, Asuquo E Asuquo
The impact of health and environmental hazards, associated with the constituents of gasoline, on occupationally exposed workers has been recorded over the past few decades. However, the scientific literature on their pathogenic potential remains incomplete, which could affect the current understanding of the associated health risks. This review provides current information based on recently improved research techniques to evaluate gasoline toxicity profiles for humans. Our current knowledge provides insight into the intricate mechanism of gasoline-induced adverse effects, including the formation of reactive metabolites via bio-activation and subsequent generation of reactive oxygen species (ROS) and oxidative stress, which are involved in multiple mechanisms that are central to the aetiology of gasoline-induced toxicity...
February 21, 2017: International Journal of Occupational Medicine and Environmental Health
https://www.readbyqxmd.com/read/28217922/characterization-of-e-ntpdase-ec-3-6-1-5-activity-in-hepatic-lymphocytes-a-different-activity-profile-from-peripheral-lymphocytes
#11
Pedro H Doleski, Stephen A Adefegha, Fernanda L Cabral, Daniela B R Leal
: The activity of ectonucleoside triphosphate diphosphohydrolase (E-NTPDase; EC 3.6.1.5) was characterized in hepatic lymphocytes (HL) of rats. For this purpose, a specific method for the isolation of lymphocytes from hepatic tissue was developed. Subsequently, E-NTPDase activity of rat HL was compared with that of rat peripheral lymphocytes. The HL showed high cell count and viability. Also, the characterization test revealed that the optimal E-NTPDase activities were attained at 37°C and pH 8...
February 19, 2017: Cell Biochemistry and Function
https://www.readbyqxmd.com/read/28212094/characteristics-of-myosin-v-processivity
#12
Jun-Ping Zhang, Yi Liu, Wei Sun, Xiaoyang Zhao, Ta La, Wei-Sheng Guo
Myosin V is a processive doubled-headed biomolecular motor involved in many intracellular organelle and vesicle transport. The unidirectional movement is coupled with the adenosine triphosphate (ATP) hydrolysis and product release cycle. With the progress of experimental techniques and the enhancement of measuring directness, detailed knowledge of the motility of myosin V has been obtained.Following the ATPase cycle, the 4-state mechanochemical model of the myosin V's processive movement is used. The transitions between various states take place in a stochastic manner...
February 14, 2017: IEEE/ACM Transactions on Computational Biology and Bioinformatics
https://www.readbyqxmd.com/read/28211814/are-major-dementias-triggered-by-poor-blood-flow-to-the-brain-theoretical-considerations
#13
Jack C de la Torre
There is growing evidence that chronic brain hypoperfusion plays a central role in the development of Alzheimer's disease (AD) long before dyscognitive symptoms or amyloid-β accumulation in the brain appear. This commentary proposes that dementia with Lewy bodies (DLB), frontotemporal dementia (FTD), and Creutzfeldt-Jakob disease (CJD) may also develop from chronic brain hypoperfusion following a similar but not identical neurometabolic breakdown as AD. The argument to support this conclusion is that chronic brain hypoperfusion, which is found at the early stages of the three dementias reviewed here, will reduce oxygen delivery and lower oxidative phosphorylation promoting a steady decline in the synthesis of the cell energy fuel adenosine triphosphate (ATP)...
February 15, 2017: Journal of Alzheimer's Disease: JAD
https://www.readbyqxmd.com/read/28209743/skeletal-muscle-bioenergetics-during-all-out-exercise-mechanistic-insight-into-the-oxygen-uptake-slow-component-and-neuromuscular-fatigue
#14
Ryan M Broxterman, Gwenael Layec, Thomas J Hureau, Markus Amann, Russell S Richardson
Although commonly used, the physiological mechanisms underlying all-out exercise performance are still unclear and an in-depth assessment of skeletal muscle bioenergetics is lacking. Therefore, phosphorous magnetic resonance spectroscopy ((31)P-MRS) was utilized to assess skeletal muscle bioenergetics during a 5-min all-out intermittent isometric knee-extensor protocol in 8 healthy men. The metabolic perturbation, adenosine triphosphate (ATP) synthesis rates, ATP cost of contraction, and mitochondrial capacity were determined from intramuscular concentrations of phosphocreatine (PCr), inorganic phosphate (Pi), diprotonated phosphate (H2PO4⁻ ), and pH...
February 16, 2017: Journal of Applied Physiology
https://www.readbyqxmd.com/read/28208618/the-function-of-the-mitochondrial-calcium-uniporter-in-neurodegenerative-disorders
#15
REVIEW
Yajin Liao, Yuan Dong, Jinbo Cheng
The mitochondrial calcium uniporter (MCU)-a calcium uniporter on the inner membrane of mitochondria-controls the mitochondrial calcium uptake in normal and abnormal situations. Mitochondrial calcium is essential for the production of adenosine triphosphate (ATP); however, excessive calcium will induce mitochondrial dysfunction. Calcium homeostasis disruption and mitochondrial dysfunction is observed in many neurodegenerative disorders. However, the role and regulatory mechanism of the MCU in the development of these diseases are obscure...
February 10, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/28208306/highly-specific-bacteriophage-affinity-strategy-for-rapid-separation-and-sensitive-detection-of-viable-pseudomonas-aeruginosa
#16
Yong He, Mengyao Wang, Enci Fan, Hui Ouyang, Huan Yue, Xiaoxiao Su, Guojian Liao, Lin Wang, Shuguang Lu, Zhifeng Fu
A virulent bacteriophage highly specific to Pseudomonas aeruginosa (P. aeruginosa) was isolated from hospital sewage using a lambda bacteriophage isolation protocol. The bacteriophage, named as PAP1, was used to functionalize tosyl-activated magnetic beads to establish a bacteriophage-affinity strategy for separation and detection of viable P. aeruginosa. Recognition of the target bacteria by tail fibers and baseplate of the bacteriophage led to capture of P. aeruginosa onto the magnetic beads. After a replication cycle of about 100 min, the progenies lysed the target bacteria and released the intracellular adenosine triphosphate...
February 7, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28208302/real-time-monitoring-atp-in-mitochondrion-of-living-cells-a-specific-fluorescent-probe-for-atp-by-dual-recognition-sites
#17
Kai-Yue Tan, Chun-Yan Li, Yong-Fei Li, Junjie Fei, Bin Yang, Ya-Jun Fu, Fang Li
Adenosine triphosphate (ATP) is mainly produced in the mitochondrion and used as a universal energy source for various cellular events. Various fluorescent probes for ATP have been established successfully, but most of them are not appropriate for monitoring the fluctuation of the mitochondrial ATP level. Herein, a fluorescent probe named Mito-Rh is first synthesized and used to recognize ATP in mitochondrion. In the probe, rhodamine, diethylenetriamine, and triphenylphosphonium are selected as fluorophore, reaction site, and mitochondrion-targeting group, respectively...
February 7, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28203080/a-fully-integrated-new-paradigm-for-lithium-s-mode-of-action-lithium-utilizes-latent-cellular-fail-safe-mechanisms
#18
Arthur Ernst van Woerkom
It is proposed that lithium's therapeutic effects occur indirectly by augmenting a cascade of protective "fail-safe" pathways pre-configured to activate in response to a dangerous low cell [Mg(++)] situation, eg, posttraumatic brain injury, alongside relative cell adenosine triphosphate depletion. Lithium activates cell protection, as it neatly mimics a lowered intracellular [Mg(++)] level.
2017: Neuropsychiatric Disease and Treatment
https://www.readbyqxmd.com/read/28202999/-changes-of-productions-of-energy-metabolism-in-masseter-of-rats-induced-by-occlusal-interference
#19
X X Xu, Y Cao, K Y Fu, Q F Xie
OBJECTIVE: To investigate the effect of occlusal interference on the energy metabolism of masticatory muscle by studying the changes of adenosine triphosphate (ATP), adenosine diphosphate (ADP), inosine monophosphate (IMP), phosphocreatine, creatine, lactate and pH level in masseter muscles of rats after occlusal interference. METHODS: Fifty male Sprague-Dawley rats were randomly assigned into experimental group (n=40) and control group (n=10). In experimental group, 0...
February 18, 2017: Beijing da Xue Xue Bao. Yi Xue Ban, Journal of Peking University. Health Sciences
https://www.readbyqxmd.com/read/28199326/a-mathematical-model-of-calcium-dynamics-in-hsy-cells
#20
Jung Min Han, Akihiko Tanimura, Vivien Kirk, James Sneyd
Saliva is an essential part of activities such as speaking, masticating and swallowing. Enzymes in salivary fluid protect teeth and gums from infectious diseases, and also initiate the digestion process. Intracellular calcium (Ca2+) plays a critical role in saliva secretion and regulation. Experimental measurements of Ca2+ and inositol trisphosphate (IP3) concentrations in HSY cells, a human salivary duct cell line, show that when the cells are stimulated with adenosine triphosphate (ATP) or carbachol (CCh), they exhibit coupled oscillations with Ca2+ spike peaks preceding IP3 spike peaks...
February 2017: PLoS Computational Biology
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