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https://www.readbyqxmd.com/read/29793133/an-ultrasensitive-and-selective-electrochemical-aptasensor-based-on-rgo-mwcnts-chitosan-carbon-quantum-dot-for-the-detection-of-lysozyme
#1
Behzad Rezaei, Hamid Reza Jamei, Ali Asghar Ensafi
An aptamer-based method is described for the electrochemical determination of lysozyme. A glassy carbon electrode was modified with a nanocomposite composed of reduced graphene oxide (rGO), multi-walled carbon nanotubes (MWCNTs), chitosan (CS), and a synthesized carbon quantum dot (CQD) from CS. The composition of the nanocomposite (rGO-MWCNT/CS/CQD) warrants a high surface-to-volume ratio, high conductivity, high stability, and great electrocatalytic activity. This nanocomposite provides a suitable site for better immobilization of aptamers due to the existence of many amino and carboxyl functional groups, and remaining oxygen-related defects properties in rGO...
May 9, 2018: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/29793073/bubble-generating-polymersomes-loaded-with-both-indocyanine-green-and-doxorubicin-for-effective-chemotherapy-combined-with-photothermal-therapy
#2
Dunwan Zhu, Fan Fan, Chenlu Huang, Zhiming Zhang, Yu Qin, Li Lu, Hai Wang, Xu Jin, Hanxue Zhao, Hu Yang, Chao Zhang, Jun Yang, Zhipeng Liu, Hongfan Sun, Xigang Leng, Deling Kong, Linhua Zhang
The combination of chemotherapy and photothermaltherapy (PTT) via stimuli-responsive nanovesicles has great potential in tumor treatment. In the present study, bubble-generating polymersomes, which can generate bubbles in response to low pH or hyperthermia, were fabricated to simultaneously encapsulate chemotherapeutic drug and photosensitizing agent for the synergistic chemo-photothermal tumor therapy. Photosensitizer indocyanine green (ICG) was encapsulated into the bilayer of polymersomes formed by amphiphilic triblock copolymer PCL8000 -PEG8000 -PCL8000 through thin film re-hydration method, while chemotherapeutic doxorubicin (DOX) was loaded into the hydrophilic lumen using a transmembrane ammonium bicarbonate gradient loading procedure...
May 21, 2018: Acta Biomaterialia
https://www.readbyqxmd.com/read/29793062/functional-mri-of-brain-physiology-in-aging-and-neurodegenerative-diseases
#3
J Jean Chen
Brain aging and associated neurodegeneration constitute a major societal challenge as well as one for the neuroimaging community. A full understanding of the physiological mechanisms underlying neurodegeneration still eludes medical researchers, fuelling the development of in vivo neuroimaging markers. Hence it is increasingly recognized that our understanding of neurodegenerative processes likely will depend upon the available information provided by imaging techniques. At the same time, the imaging techniques are often developed in response to the desire to observe certain physiological processes...
May 21, 2018: NeuroImage
https://www.readbyqxmd.com/read/29792841/decarboxylation-of-ang-1-7-to-ala-1-ang-1-7-leads-to-significant-changes-in-pharmacodynamics
#4
Anja Tetzner, Maura Naughton, Kinga Gebolys, Jenny Eichhorst, Esther Sala, Óscar Villacañas, Thomas Walther
The heptapeptide angiotensin (Ang)-(1-7) is part of the beneficial arm of the renin-angiotensin system. Ang-(1-7) has cardiovascular protective effects, stimulates regeneration, and opposes the often detrimental effects of Ang II. We recently identified the G protein-coupled receptors Mas and MrgD as receptors for the heptapeptide. Ala1 -Ang-(1-7) (Alamandine), a decarboxylated form of Ang-(1-7), has similar vasorelaxant effects, but has been described to only stimulate MrgD. Therefore, this study aimed to characterise the consequences of the lack of the carboxyl group in amino acid 1 on intracellular signalling and to identify the receptor fingerprint for Ala1 -Ang-(1-7)...
May 21, 2018: European Journal of Pharmacology
https://www.readbyqxmd.com/read/29792808/eradication-of-established-tumors-by-chemically-self-assembled-nanoring-csan-targeted-t-cells
#5
Jacob Petersburg, Jingjing Shen, Clifford M Csizmar, Katherine A Murphy, Justin Spanier, Kari Gabrielse, Thomas S Griffith, Brian Fife, Carston R Wagner
Our laboratory has developed chemically self-assembled nanorings (CSANs) as prosthetic antigen receptors (PARs) for the non-genetic modification of T-cell surfaces. PARs have been successfully employed in vitro to activate T cells for the selective killing of leukemia cells. However, PAR efficacy has yet to be evaluated in vivo or against solid tumors. Therefore, we developed bispecific PARs that selectively target the human CD3 receptor and human Epithelial Cell Adhesion Molecule (EpCAM), which is overexpressed on multiple carcinomas and cancer stem cells...
May 24, 2018: ACS Nano
https://www.readbyqxmd.com/read/29792673/recent-advances-on-sodium-oxygen-batteries-a-chemical-perspective
#6
Hossein Yadegari, Xueliang Sun
Releasing greenhouse gases into the atmosphere because of widespread use of fossil fuels by humankind has resulted in raising the earth's temperature during the past few decades. Known as global warming, increasing the earth's temperature may in turn endanger civilization on the earth by starting a cycle of environmental changes including climate change and sea level rise. Therefore, replacing fossil fuels with more sustainable energy resources has been considered as one of the main strategies to tackle the global warming crisis...
May 24, 2018: Accounts of Chemical Research
https://www.readbyqxmd.com/read/29792572/galnac-sirna-conjugates-leading-the-way-for-delivery-of-rnai-therapeutics
#7
Aaron D Springer, Steven F Dowdy
Short-interfering RNA (siRNA)-induced RNAi responses have great potential to treat a wide variety of human diseases from cancer to pandemic viral outbreaks to Parkinson's Disease. However, before siRNAs can become drugs, they must overcome a billion years of evolutionary defenses designed to keep invading RNAs on the outside cells from getting to the inside of cells. Not surprisingly, significant effort has been placed in developing a wide array of delivery technologies. Foremost of these has been the development of N-acetylgalactosamine (GalNAc) siRNA conjugates for delivery to liver...
May 24, 2018: Nucleic Acid Therapeutics
https://www.readbyqxmd.com/read/29792338/molecular-mechanism-for-the-influence-of-gender-dimorphism-on-alcoholic-liver-injury-in-mice
#8
S-Q Li, P Wang, D-M Wang, H-J Lu, R-F Li, L-X Duan, S Zhu, S-L Wang, Y-Y Zhang, Y-L Wang
It is known that women develop alcoholic liver injury more rapidly and have a lower alcohol toxic threshold than men. However, the detailed molecular mechanisms remain unclear. The precise mechanism responsible for the sex difference needs to be determined. Female and male mice were given ethanol by intragastric infusion every day for 4 weeks. The pathological changes were detected by hematoxylin-eosin, Sirius red, oil red O, periodic acid-Schiff, and Hochest33258 staining in the liver of female and male mice...
January 1, 2018: Human & Experimental Toxicology
https://www.readbyqxmd.com/read/29792142/collaboration-of-the-joint-research-centre-and-the-european-customs-laboratories-for-identification-of-new-psychoactive-substances
#9
Claude Guillou, Fabiano Reniero, Joana Lobo Pereira Vicente, Margaret Holland, Kamil Kolar, Hubert Chassaigne, Salvatore Tirendi, Herve Schepers
The emergence of designer drugs as substances of abuse has seen a dramatic increase over the last few years. Customs officials are responsible for the control of products entering the European Union (EU) market. This control applies to chemicals in general, pharmaceutical products and medicines. Numerous products imported from non-EU countries, often -declared as 'bath salts' or 'fertilizers', may in fact contain new psychoactive substance (NPS). These are not necessarily controlled under international law, but are subject to monitoring in agreement with EU legislation...
May 23, 2018: Current Pharmaceutical Biotechnology
https://www.readbyqxmd.com/read/29792020/daclatasvir-and-asunaprevir-combination-therapy-for-patients-with-chronic-hepatitis-c-virus-genotype-1b-infection-in-real-world
#10
Jae Young Oh, Byung Seok Kim, Chang Hyeong Lee, Jeong Eun Song, Heon Ju Lee, Jung Gil Park, Jae Seok Hwang, Woo Jin Chung, Byoung Kuk Jang, Young Oh Kweon, Won Young Tak, Soo Young Park, Se Young Jang, Jeong Ill Suh, Sang Gyu Kwak
Background/Aims: Previous studies have reported a high rate of sustained virologic response (SVR) and a low rate of serious adverse events with the use of daclatasvir (DCV) and asunaprevir (ASV) combination therapy. We evaluated the efficacy and safety of DCV and ASV combination therapy for patients with chronic hepatitis C virus (HCV) genotype 1b infection in real world. Methods: We enrolled 278 patients (184 treatment-naïve patients) from five hospitals in Daegu and Gyeongsangbuk-do...
May 25, 2018: Korean Journal of Internal Medicine
https://www.readbyqxmd.com/read/29791805/identifying-the-nonradical-mechanism-in-the-peroxymonosulfate-activation-process-singlet-oxygenation-versus-mediated-electron-transfer
#11
Eun-Tae Yun, Jeong Hoon Lee, Jaesung Kim, Hee-Deung Park, Jaesang Lee
Select persulfate activation processes were demonstrated to initiate oxidation not reliant on sulfate radicals, though the underlying mechanism has yet to be identified. This study explored singlet oxygenation and mediated electron transfer as plausible nonradical mechanisms for organic degradation by carbon nanotube (CNT)-activated peroxymonosulfate (PMS). The degradation of furfuryl alcohol (FFA) as a singlet oxygen (1O2) indicator and the kinetic retardation of FFA oxidation in the presence of L-histidine and azide as 1O2 quenchers apparently supported a role of 1O2 in the CNT/PMS system...
May 23, 2018: Environmental Science & Technology
https://www.readbyqxmd.com/read/29791517/costs-of-cold-acclimation-on-survival-and-reproductive-behavior-in-drosophila-melanogaster
#12
Elizabeth R Everman, Jennifer L Delzeit, F Kate Hunter, Jennifer M Gleason, Theodore J Morgan
Fitness is determined by the ability of an organism to both survive and reproduce; however, the mechanisms that lead to increased survival may not have the same effect on reproductive success. We used nineteen natural Drosophila melanogaster genotypes from the Drosophila Genetic Reference Panel to determine if adaptive plasticity following short-term acclimation through rapid cold-hardening (RCH) affects mating behavior and mating success. We confirmed that exposure to the acclimation temperature is beneficial to survival following cold stress; however, we found that this same acclimation temperature exposure led to less efficient male courtship and a significant decrease in the likelihood of mating...
2018: PloS One
https://www.readbyqxmd.com/read/29791477/functional-characterization-of-oxazolone-induced-colitis-and-survival-improvement-by-vagus-nerve-stimulation
#13
Elisa Meroni, Nathalie Stakenborg, Pedro J Gomez-Pinilla, Gert De Hertogh, Gera Goverse, Gianluca Matteoli, Simon Verheijden, Guy E Boeckxstaens
BACKGROUND: Oxazolone-induced colitis has been frequently used in literature as a model of IBD, but insights into the underlying immune response and pathological features are surprisingly still very limited. Vagus nerve stimulation (VNS) has proven to be effective in innate and Th1/Th17 predominant inflammatory models, including pre-clinical models of colitis, however to what extent VNS is also effective in ameliorating Th2-driven colitis remains to be studied. In the present study, we therefore further characterized the immune response in oxazolone-induced colitis and investigated the potential therapeutic effect of VNS...
2018: PloS One
https://www.readbyqxmd.com/read/29791432/logistical-constraints-lead-to-an-intermediate-optimum-in-outbreak-response-vaccination
#14
Yun Tao, Katriona Shea, Matthew Ferrari
Dynamic models in disease ecology have historically evaluated vaccination strategies under the assumption that they are implemented homogeneously in space and time. However, this approach fails to formally account for operational and logistical constraints inherent in the distribution of vaccination to the population at risk. Thus, feedback between the dynamic processes of vaccine distribution and transmission might be overlooked. Here, we present a spatially explicit, stochastic Susceptible-Infected-Recovered-Vaccinated model that highlights the density-dependence and spatial constraints of various diffusive strategies of vaccination during an outbreak...
May 23, 2018: PLoS Computational Biology
https://www.readbyqxmd.com/read/29790593/efficacy-and-absorption-of-topical-sirolimus-for-the-treatment-of-vascular-anomalies-in-children-a-case-series
#15
Sophie Le Sage, Michèle David, Josée Dubois, Julie Powell, Catherine C McCuaig, Yves Théorêt, Niina Kleiber
BACKGROUND/OBJECTIVES: Efficacy of topical sirolimus has recently been described in lymphatic anomalies but not in other types of vascular anomalies. To our knowledge, systemic absorption of topical sirolimus in these lesions has not yet been reported. The objective was to evaluate the efficacy, tolerance, and absorption of topical sirolimus 0.1% with different types of vascular anomalies in children. METHODS: Sirolimus 0.1% was applied on cutaneous vascular anomalies in six children aged 2-17...
May 23, 2018: Pediatric Dermatology
https://www.readbyqxmd.com/read/29790428/multi-ethnic-sult1a1-copy-number-profiling-with-multiplex-ligation-dependent-probe-amplification
#16
Raymon Vijzelaar, Mariana R Botton, Lisette Stolk, Suparna Martis, Robert J Desnick, Stuart A Scott
AIM: To develop a SULT1A1 multiplex ligation-dependent probe amplification assay and to investigate multi-ethnic copy number variant frequencies. METHODS: A novel multiplex ligation-dependent probe amplification assay was developed and tested on 472 African-American, Asian, Caucasian, Hispanic and Ashkenazi Jewish individuals. RESULTS: The frequencies of atypical total copy number (i.e., greater or less than two) were 38.7% for Hispanics, 38...
May 23, 2018: Pharmacogenomics
https://www.readbyqxmd.com/read/29790391/neutrophil-exocytosis-induces-podocyte-cytoskeletal-reorganization-and-proteinuria-in-experimental-glomerulonephritis
#17
Dawn J Caster, Erik A Korte, Min Tan, Michelle T Barati, Shweta Tandon, T Michael Creed, David J Salant, Jessica L Hata, Paul N Epstein, Hui Huang, David W Powell, Kenneth R McLeish
Acute glomerulonephritis is characterized by rapid glomerular neutrophil recruitment, proteinuria, and glomerular hypercellularity. The current study tested the hypothesis that release of neutrophil granule contents plays a role in both loss of filtration barrier leading to proteinuria and the increase in glomerular cells. Inhibition of neutrophil exocytosis with a peptide inhibitor prevented proteinuria and attenuated podocyte and endothelial cell injury, but had no effect on glomerular hypercellularity in an experimental acute glomerulonephritis model in mice...
May 23, 2018: American Journal of Physiology. Renal Physiology
https://www.readbyqxmd.com/read/29790347/hydrophobic-collapse-of-ubiquitin-generates-rapid-protein-water-motions
#18
Hanna Wirtz, Sarah Schaefer, Claudius Hoberg, Korey M Reid, David M Leitner, Martina Havenith
We report time resolved measurements of the coupled protein-water modes of solvated ubiquitin during protein folding. Kinetic terahertz absorption (KITA) spectroscopy serves as a label-free technique to monitor large-scale conformational changes and folding of proteins subsequent to a sudden T-jump. Our KITA measurements reveal a significant change in the coupled ubiquitin-solvent dynamics even in the initial phase of hydrophobic collapse. Complementary equilibrium experiments and molecular simulations of ubiquitin solutions were carried out to clarify non-equilibrium contributions and reveal the molecular picture upon structural change, respectively...
May 23, 2018: Biochemistry
https://www.readbyqxmd.com/read/29790247/the-promotion-of-tissue-engineering-blood-vessel-patency-by-cgs21680-through-regulating-pro-inflammatory-activities-of-endothelial-progenitor-cell
#19
Wen Chen, Li Xiao, Jian Bai, Wen Zeng, Mingcan Yang, Bingyi Shi, Chuhong Zhu
The mobilization and homing of endothelial progenitor cells (EPCs) contribute to the rapid endothelialization of tissue engineering blood vessel (TEBV). Inflammation can affect TEBV patency, and monocytes/macrophages (MM) are the main effector cells. But it is not clear how EPCs interact with MM after TEBV transplantation. Our results showed acellular materials would not directly cause acute and severe inflammatory responses but activate E-selectin expression in homing EPCs, gradually promoting the polarization of MM to the M1...
May 23, 2018: Journal of Biomedical Materials Research. Part A
https://www.readbyqxmd.com/read/29790058/the-synergistic-effect-of-organic-acids-phytochemicals-and-a-permeabilizing-complex-reduces-salmonella-typhimurium-1-4-5-12-i-shedding-in-pigs
#20
Ruggeri Jessica, Foresti Fabio, Pavesi Roberta, Terrini Alessia, Giudici Francesca, Padoan Diego, Corradi Attilio, Ossiprandi Maria Cristina, Pasquali Paolo, Alborali Giovanni Loris
Salmonella Typhimurium (including S.Typhimurium 1,4,[5],12:i-) and other enteric pathogens cause acute infection in pigs during the weaning stage, often evolving into chronic infections responsible for the introduction of zoonotic bacteria into the slaughterhouse and thus determining carcass contamination. In addition to being zoonotic hazards, these pathogens are responsible for economic losses in affected farms. Traditionally, antibiotic treatments have been largely administered in order to reduce the infection burden but it favored, as a direct consequence, an increase in the number of multi-drug resistance strains...
May 22, 2018: Veterinary Research Communications
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