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https://www.readbyqxmd.com/read/28749450/evaluation-of-shifted-excitation-raman-difference-spectroscopy-and-comparison-to-computational-background-correction-methods-applied-to-biochemical-raman-spectra
#1
Eliana Cordero, Florian Korinth, Clara Stiebing, Christoph Krafft, Iwan W Schie, Jürgen Popp
Raman spectroscopy provides label-free biochemical information from tissue samples without complicated sample preparation. The clinical capability of Raman spectroscopy has been demonstrated in a wide range of in vitro and in vivo applications. However, a challenge for in vivo applications is the simultaneous excitation of auto-fluorescence in the majority of tissues of interest, such as liver, bladder, brain, and others. Raman bands are then superimposed on a fluorescence background, which can be several orders of magnitude larger than the Raman signal...
July 27, 2017: Sensors
https://www.readbyqxmd.com/read/28749400/a-novel-approach-for-characterizing-variations-in-serum-peptides-in-rheumatic-heart-disease
#2
Xiaochen Wu, Qin Yue, Weikun Jia, Jinbao Zhang, Hui Ouyang, Dong Xin, Yingbin Xiao
BACKGROUND & OBJECTIVES: Acute rheumatic fever and rheumatic heart disease (RHD) are important public health problems in developing countries. In this study, peptidomic analyses on RHD patients and healthy individuals were performed to characterize variations in serum peptide levels using label-free quantitation approaches. METHODS: Blood samples were obtained from 160 healthy controls and 160 RHD patients. Of the 448 identified peptides, 272 were analyzed by two label-free mass spectrometry methods, the spectral count and spectral index...
March 2017: Indian Journal of Medical Research
https://www.readbyqxmd.com/read/28749356/improving-alzheimeres-disease-classification-by-combining-multiple-measures
#3
Jin Liu, Jianxin Wang, Zhenjun Tang, Bin Hu, Fang-Xiang Wu, Yi Pan
Several anatomical magnetic resonance imaging (MRI) markers for Alzheimer's disease (AD) have been identified. Cortical gray matter volume, cortical thickness, and subcortical volume have been used successfully to assist the diagnosis of Alzheimer's disease (AD) including its early warning and developing stages, e.g., mild cognitive impairment (MCI) including MCI converted to AD (MCIc) and MCI not converted to AD (MCInc). Currently, these anatomical MRI measures have mainly been used separately. Thus, the full potential of anatomical MRI scans for AD diagnosis might not yet have been used optimally...
July 25, 2017: IEEE/ACM Transactions on Computational Biology and Bioinformatics
https://www.readbyqxmd.com/read/28749340/super-resolution-imaging-of-synaptic-and-extra-synaptic-ampa-receptors-with-different-sized-fluorescent-probes
#4
Sang Hak Lee, Chaoyi Jin, En Cai, Pinghua Ge, Yuji Ishitsuka, Kai Wen Teng, Andre A de Thomaz, Duncan L Nall, Murat Baday, Okunola Jeyifous, Daniel Demonte, Christopher M Dundas, Sheldon Park, Jary Y Delgado, William N Green, Paul R Selvin
Previous studies tracking AMPA receptor (AMPAR) diffusion at synapses observed a large mobile extrasynaptic AMPAR pool. Using super-resolution microscopy, we examined how fluorophore size and photostability affected AMPAR trafficking outside of, and within, post-synaptic densities (PSDs) from rats. Organic fluorescent dyes (≈4 nm), quantum dots, either small (≈10 nm diameter; sQDs) or big (>20 nm; bQDs), were coupled to AMPARs via different-sized linkers. We find that >90% of AMPARs labeled with fluorescent dyes or sQDs were diffusing in confined nanodomains in PSDs, which were stable for 15 minutes or longer...
July 27, 2017: ELife
https://www.readbyqxmd.com/read/28749131/lysine-deacetylases-exhibit-distinct-changes-in-activity-profiles-due-to-fluorophore-conjugation-of-substrates
#5
Tasha B Toro, Jenae R Bryant, Terry J Watt
Lysine deacetylases (KDACs) are enzymes that reverse the post-translational modification of lysine acetylation. Thousands of potential substrates, acetylated protein sequences, have been identified in mammalian cells. Properly regulated acetylation and deacetylation have been linked to many biological processes, while aberrant KDAC activity has also been linked to numerous diseases. Commercially available peptide substrates that are conjugated to fluorescent dye molecules, such as 7-amino-4-methylcoumarin (AMC), are commonly used to monitor deacetylation in studies addressing both substrate specificity and small molecule modulators of activity...
July 27, 2017: Biochemistry
https://www.readbyqxmd.com/read/28749092/ketamine-for-depression-4-in-what-dose-at-what-rate-by-what-route-for-how-long-and-at-what-frequency
#6
Chittaranjan Andrade
BACKGROUND: Ketamine, administered in subanesthetic doses, is an effective off-label treatment for severe and even treatment-refractory depression; however, despite dozens of studies across nearly 2 decades of research, there is no definitive guidance on matters related to core practice issues. METHODS: This article presents a qualitative review and summary about what is known about ketamine dosing, rate of administration, route of administration, duration of treatment, and frequency of sessions...
July 25, 2017: Journal of Clinical Psychiatry
https://www.readbyqxmd.com/read/28749091/efficacy-of-ziprasidone-augmentation-of-escitalopram-for-cognitive-symptoms-of-major-depressive-disorder
#7
Nadia Iovieno, Richard C Shelton, Samuel R Petrie, Cristina Cusin, Maurizio Fava, George I Papakostas
OBJECTIVE: To examine the efficacy of adjunctive ziprasidone for cognitive symptoms in adult patients with major depressive disorder (MDD) experiencing persistent symptoms after 8 weeks of open-label escitalopram. METHODS: This post hoc analysis was conducted on a database derived from a previously published study. The parent study was a multicenter, parallel, randomized, double-blind, placebo-controlled trial conducted at 3 academic medical centers in the United States from July 2008 to October 2013...
July 25, 2017: Journal of Clinical Psychiatry
https://www.readbyqxmd.com/read/28749056/on-legalizing-physician-assisted-death-for-dementia
#8
Rebecca Dresser
Last November, soon after Colorado became the latest state to authorize physician-assisted suicide, National Public Radio's The Diane Rehm Show devoted a segment to legalization of "physician assistance in dying," a label that refers to both physician-assisted suicide and voluntary active euthanasia. Although the segment initially focused on PAD in the context of terminal illness in general, it wasn't long before PAD's potential application to dementia patients came up. A caller said that her mother had Alzheimer's disease and was being cared for at great expense...
July 2017: Hastings Center Report
https://www.readbyqxmd.com/read/28748959/biological-labels-here-comes-the-spaser
#9
Catherine Alix-Panabières, Klaus Pantel
No abstract text is available yet for this article.
July 26, 2017: Nature Materials
https://www.readbyqxmd.com/read/28748934/synergy-of-synthesis-computation-and-nmr-reveals-correct-baulamycin-structures
#10
Jingjing Wu, Paula Lorenzo, Siying Zhong, Muhammad Ali, Craig P Butts, Eddie L Myers, Varinder K Aggarwal
Small-molecule, biologically active natural products continue to be our most rewarding source of, and inspiration for, new medicines. Sometimes we happen upon such molecules in minute quantities in unique, difficult-to-reach, and often fleeting environments, perhaps never to be discovered again. In these cases, determining the structure of a molecule-including assigning its relative and absolute configurations-is paramount, enabling one to understand its biological activity. Molecules that comprise stereochemically complex acyclic and conformationally flexible carbon chains make such a task extremely challenging...
July 26, 2017: Nature
https://www.readbyqxmd.com/read/28748882/superiority-of-peginterferon-%C3%AE-2a-and-ribavirin-combination-over-peginterferon-%C3%AE-2a-monotherapy-in-the-management-of-hemodialysis-patients-with-chronic-hepatitis-c-virus-infection
#11
Saeed M G Al-Ghamdi, Nasser Alaulaqi, Abdullah A Al-Amoudi, Amenah Alghamdi, Abbas Zagnoon, Bakr Ben Sadiq
Hepatitis C virus (HCV) is a common infection affecting 15% of hemodialysis population in Saudi Arabia resulting in delay in transplantation and long-term complications. The use of peginterferon resulted in sustained virologic response (SVR) in 40%-85% of patients, especially if combined with ribavirin. The treatment is hampered by the high dropout due to anemia and requirement of blood transfusion resulting from this therapy. Some studies have shown that the addition of increasing dose of erythropoiesis-stimulating agents (ESA) and reduced dose of ribavirin results in reduced dropout rate with high SVR...
July 2017: Saudi Journal of Kidney Diseases and Transplantation
https://www.readbyqxmd.com/read/28748755/biotin-and-glutathione-targeting-of-solid-nanoparticles-to-cross-human-brain-endothelial-cells
#12
Szilvia Veszelka, Mária Mészáros, Lóránd Kiss, Zoltán Kóta, Tibor Páli, Zsófia Hoyk, Zsolt Bozsó, Lívia Fülöp, András Tóth, Gábor Rákhely, Mária A Deli
Background The blood-brain barrier restricts drug penetration to the central nervous system. Targeted nanocarriers are new potential tools to increase the brain entry of drugs. Ligands of endogenous transporters of the blood-brain barrier can be used as targeting vectors for brain delivery of nanoparticles. Objective We tested biotin-labeled solid nanoparticles for the first time and compared to biotinylated glutathione-labeled nanoparticles in brain endothelial cells. Method Neutravidin coated fluorescent polystyrene nanoparticles were derivatized with biotin and biotinylated glutathione...
July 27, 2017: Current Pharmaceutical Design
https://www.readbyqxmd.com/read/28748732/split-root-labelling-to-investigate-15-n-rhizodeposition-by-pinus-sylvestris-and-picea-abies
#13
Liz Veerman, Karsten Kalbitz, Jorien C Schoorl, Albert Tietema
We investigated the transfer of (15)N into the soil via (15)N uptake and release by tree roots, which involves the principles of the split-root technique. One half of the root system received an injection of ((15)NH4)2SO4 and the other half equivalent amounts of (NH4)2SO4 at (15)N natural abundance level. (15)N was transferred from one side of the root system ((15)N side) to the other side ((14)N side) and released into the soil. The method was conducted with Scots pine (Pinus sylvestris L.) and Norway spruce (Picea abies [L...
July 27, 2017: Isotopes in Environmental and Health Studies
https://www.readbyqxmd.com/read/28748626/combining-bottom-up-and-top-down-approaches-to-assess-the-impact-of-food-and-gastric-ph-on-pictilisib-gdc-0941-pharmacokinetics
#14
Tong Lu, Grazyna Fraczkiewicz, Laurent Salphati, Nageshwar Budha, Gena Dalziel, Gillian S Smelick, Kari M Morrissey, John D Davis, Jin Y Jin, Joseph A Ware
Pictilisib, a weakly basic compound, is an orally administered, potent, and selective pan-inhibitor of phosphatidylinositol 3-kinases for oncology indications. To investigate the significance of high-fat food and gastric pH on pictilisib pharmacokinetics (PK) and enable label recommendations, a dedicated clinical study was conducted in healthy volunteers, whereby both top-down [Population PK, (PopPK)] and bottom-up [physiologically-based PK, (PBPK)] approaches were applied to enhance confidence of recommendation and facilitate the clinical development through scenario simulations...
July 27, 2017: CPT: Pharmacometrics & Systems Pharmacology
https://www.readbyqxmd.com/read/28748573/a-novel-humanized-anti-tumor-necrosis-factor-related-apoptosis-inducing-ligand-r2-monoclonal-antibody-induces-apoptotic-and-autophagic-cell-death
#15
Longfei Chen, Yuhe Qiu, Zhenliang Hao, Jiong Cai, Shuyong Zhang, Yanxin Liu, Dexian Zheng
It is well known that the tumor necrosis factor-related apoptosis-inducing ligand (TRAIL/TNFSF10) is specifically expressed in various tumor cells, but less or no expression in most normal tissues and cells. While TRAIL engages with its native death receptors, TRAIL receptor 1 (TRAIL-R1) or 2 (TRAIL-R2), usually elicits the tumor cell death by apoptosis. In this study, we report that a novel humanized monoclonal antibody against TRAIL-R2 (named as zaptuzumab) well remain the biological activity of the parental mouse antibody AD5-10 inducing cell death in various cancer cells, but little effect on normal cells...
July 27, 2017: IUBMB Life
https://www.readbyqxmd.com/read/28748562/visualization-of-macrophage-recruitment-in-head-and-neck-carcinoma-model-using-fluorine-19-magnetic-resonance-imaging
#16
Aman Khurana, Fanny Chapelin, Hongyan Xu, Joseph R Acevedo, Alfred Molinolo, Quyen Nguyen, Eric T Ahrens
PURPOSE: To evaluate the role of infiltrating macrophages in murine models of single and double mutation head and neck tumors using a novel fluorine-19 ((19) F) MRI technology. METHODS: Tumor cell lines single-hit/SCC4 or double-hit/Cal27, with mutations of TP53 and TP53 & FHIT, respectively, were injected bilaterally into the flanks of (n = 10) female mice. With tumors established, perfluorocarbon nanoemulsion was injected intravenously, which labels in situ predominantly monocytes and macrophages...
July 26, 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/28748517/analysis-of-cation-dependent-dna-g3t1-4-shape-change-using-fluorescence-correlation-spectroscopy
#17
Jaeran Lee, Sok Won Kim
In G-rich DNA, it is well known that the form changes from single-strand DNA to G-quadruplex due to cations. In this study, we analyze the diffusion coefficient and fluorescence intensity obtained by fluorescence correlation spectroscopy for short G-rich DNA of the (G3T1)4 sequence labeled as 5-Carboxytetramethylrhodamine (TAMRA) with variation of the K(+) ion concentration. At a K(+) ion concentration of more than 200 mM, the single-strand DNA was changed to the G-quadruplex. The size of the G-quadruplex decreased to 86% than the size of the single strand DNA at K(+) ion concentration of 0 M...
July 26, 2017: Journal of Fluorescence
https://www.readbyqxmd.com/read/28748477/chromogenic-in-situ-hybridization-methods-for-microrna-biomarker-monitoring-of-drug-safety-and-efficacy
#18
Barbara R Gould, Tina Damgaard, Boye Schnack Nielsen
Disease research and treatment development have turned to the impact and utility of microRNA. The dynamic and highly specific expression of these molecular regulators can be used to predict and monitor disease progression as well as therapeutic treatment efficacy and safety, thus aiding decisions in patient care. In situ hybridization (ISH) of biopsy material has become a routine clinical pathology procedure for monitoring gene structure, expression, and sample characterization. For ribonucleic acid (RNA), determining cell source and level of expression of these biomarkers gives insight into the cellular function and physiopathology...
2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/28748462/in-vivo-rat-t-lymphocyte-pig-a-assay-detection-and-expansion-of-cells-deficient-in-the-gpi-anchored-cd48-surface-marker-for-analysis-of-mutation-in-the-endogenous-pig-a-gene
#19
Vasily N Dobrovolsky, Javier Revollo, Dayton M Petibone, Robert H Heflich
The Pig-a assay is being developed as an in vivo gene mutation assay for regulatory safety assessments. The assay is based on detecting mutation in the endogenous Pig-a gene of treated rats by using flow cytometry to measure changes in cell surface markers of peripheral blood cells. Here we present a methodology for demonstrating that phenotypically mutant rat T-cells identified by flow cytometry contain mutations in the Pig-a gene, an important step for validating the assay. In our approach, the mutant phenotype T-cells are sorted into individual wells of 96-well plates and expanded into clones...
2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/28748393/the-validate29-mri-based-multi-channel-atlas-of-the-squirrel-monkey-brain
#20
Kurt G Schilling, Yurui Gao, Iwona Stepniewska, Tung-Lin Wu, Feng Wang, Bennett A Landman, John C Gore, Li Min Chen, Adam W Anderson
We describe the development of the first digital atlas of the normal squirrel monkey brain and present the resulting product, VALiDATe29. The VALiDATe29 atlas is based on multiple types of magnetic resonance imaging (MRI) contrast acquired on 29 squirrel monkeys, and is created using unbiased, nonlinear registration techniques, resulting in a population-averaged stereotaxic coordinate system. The atlas consists of multiple anatomical templates (proton density, T1, and T2* weighted), diffusion MRI templates (fractional anisotropy and mean diffusivity), and ex vivo templates (fractional anisotropy and a structural MRI)...
July 26, 2017: Neuroinformatics
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