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https://www.readbyqxmd.com/read/29792690/a-general-method-to-increase-stokes-shift-by-introducing-alternating-vibronic-structures
#1
Tian-Bing Ren, Wang Xu, Wei Zhang, Xing-Xing Zhang, Zhi-Yao Wang, Zhen Xiang, Lin Yuan, Xiaobing Zhang
Fluorescent dyes have enabled the progress of the broad biomedical fields. However, many commercially available dyes suffer from small Stokes shifts, resulting in poor signal-to-noise ratio and self-quenching on current microscope configuration. In this work, we have developed a general method to significantly increase the Stokes shifts of common fluorophores. By simply appending a 1,4-diethyl-decahydro-quinoxaline (DQ) moiety onto the conjugated structure, we introduced a vibronic backbone that could facilely expand the Stokes shifts, emission wavelength and photo-stability of eleven different fluorophores by more than 3-fold...
May 24, 2018: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/29786697/imaging-glutathione-depletion-in-the-rat-brain-using-ascorbate-derived-hyperpolarized-mr-and-pet-probes
#2
Hecong Qin, Valerie N Carroll, Renuka Sriram, Javier E Villanueva-Meyer, Cornelius von Morze, Zhen Jane Wang, Christopher A Mutch, Kayvan R Keshari, Robert R Flavell, John Kurhanewicz, David M Wilson
Oxidative stress is a critical feature of several common neurologic disorders. The brain is well adapted to neutralize oxidative injury by maintaining a high steady-state concentration of small-molecule intracellular antioxidants including glutathione in astrocytes and ascorbic acid in neurons. Ascorbate-derived imaging probes for hyperpolarized 13 C magnetic resonance spectroscopy and positron emission tomography have been used to study redox changes (antioxidant depletion and reactive oxygen species accumulation) in vivo...
May 21, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29778476/glycation-of-whey-protein-with-dextrans-of-different-molar-mass-effect-on-immunoglobulin-e-binding-capacity-with-blood-sera-obtained-from-patients-with-cow-milk-protein-allergy
#3
Lei Xu, Yuansheng Gong, James E Gern, Shinya Ikeda, John A Lucey
A growing concern around the world is the number of people who are suffering from food protein allergies. One potential approach to decrease protein allergenicity is to block IgE-binding epitopes of the protein allergen by attachment of polysaccharides via the Maillard reaction (i.e., glycation). Protein glycation has been extensively studied to modify various functional properties. We wanted to examine whether glycates could reduce IgE binding in patients with cow milk protein allergy and to explore how the size (molar mass; MW ) of the polysaccharide affects this IgE-binding capacity...
May 16, 2018: Journal of Dairy Science
https://www.readbyqxmd.com/read/29776438/uninterrupted-monitoring-of-drug-effects-in-human-induced-pluripotent-stem-cell-derived-cardiomyocytes-with-bioluminescence-ca-2-microscopy
#4
Kazushi Suzuki, Takahito Onishi, Chieko Nakada, Shunsuke Takei, Matthew J Daniels, Masahiro Nakano, Tomoki Matsuda, Takeharu Nagai
OBJECTIVE: Cardiomyocytes derived from human-induced pluripotent stem cells are a powerful platform for high-throughput drug screening in vitro. However, current modalities for drug testing, such as electrophysiology and fluorescence imaging have inherent drawbacks. To circumvent these problems, we report the development of a bioluminescent Ca2+ indicator GmNL(Ca2+ ), and its application in a customized microscope for high-throughput drug screening. RESULTS: GmNL(Ca2+ ) gives a 140% signal change with Ca2+ , and can image drug-induced changes of Ca2+ dynamics in cultured cells...
May 18, 2018: BMC Research Notes
https://www.readbyqxmd.com/read/29775731/targeted-and-controlled-drug-delivery-by-multifunctional-mesoporous-silica-nanoparticles-with-internal-fluorescent-conjugates-and-external-polydopamine-and-graphene-oxide-layers
#5
Anh-Vy Tran, KyuHwan Shim, Thu-Thao Vo Thi, Jeong-Keun Kook, Seong Soo A An, Sang-Wha Lee
This study demonstrated the targeted delivery and controlled release of cisplatin drug molecules from doubly decorated mesoporous silica nanoparticles (MSNs), which were internally grafted with fluorescent conjugates and externally coated with polydopamine (PDA) and graphene oxide (GO) layers. The brush-like internal conjugates conferred fluorescent functionality and high capacity of cisplatin loading into MSNs, as well as contributing to a sustained release of the cisplatin through a porous channel with the assistance of external PDA layer...
May 15, 2018: Acta Biomaterialia
https://www.readbyqxmd.com/read/29771468/interaction-between-cyanine-dye-ir-783-and-polystyrene-nanoparticles-in-solution
#6
Yunzhi Zhang, Hui Xu, Leah B Casabianca
The interactions between small molecule drugs or dyes and nanoparticles are important to the use of nanoparticles in medicine. Noncovalent adsorption of dyes on nanoparticle surfaces is also important to the development of nanoparticle dual-use imaging contrast agents. In the present work, solution-state NMR is used to examine the noncovalent interaction between a near-infrared cyanine dye and the surface of polystyrene nanoparticles in solution. Using 1D proton NMR, we can approximate the number of dye molecules that associate with each nanoparticle for different sized nanoparticles...
May 17, 2018: Magnetic Resonance in Chemistry: MRC
https://www.readbyqxmd.com/read/29771460/targeting-prostate-cancer-prostate-specific-membrane-antigen-based-diagnosis-and-therapy
#7
REVIEW
Till Wüstemann, Uwe Haberkorn, John Babich, Walter Mier
The high incidence rates of prostate cancer (PCa) raise demand for improved therapeutic strategies. Prostate tumors specifically express the prostate-specific membrane antigen (PSMA), a membrane-bound protease. As PSMA is highly overexpressed on malignant prostate tumor cells and as its expression rate correlates with the aggressiveness of the disease, this tumor-associated biomarker provides the possibility to develop new strategies for diagnostics and therapy of PCa. Major advances have been made in PSMA targeting, ranging from immunotherapeutic approaches to therapeutic small molecules...
May 17, 2018: Medicinal Research Reviews
https://www.readbyqxmd.com/read/29770838/metal-oxide-nanoparticles-for-latent-fingerprint-visualization-and-analysis-of-small-drug-molecules-using-surface-assisted-laser-desorption-ionization-mass-spectrometry
#8
Mohamed O Amin, Metwally Madkour, Entesar Al-Hetlani
We explored the applicability of different metal oxide nanoparticles (NPs; ZnO, TiO2 , Fe2 O3 , and CeO2 ) for the optical imaging and mass spectrometric determination of small drug molecules in latent fingerprints (LFPs). Optical imaging was achieved using a dry method-simply dusting the LFPs with a minute amount of NP powder-and still images were captured using a digital microscope and a smartphone camera. Mass spectrometric determination was performed using the NPs as substrates for surface-assisted laser desorption ionization/mass spectrometry (SALDI-MS), which enabled the detection of small drug molecules with high signal intensities...
May 17, 2018: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/29768838/mesoporous-cds-via-network-of-self-assembled-nanocrystals-synthesis-characterization-and-enhanced-photoconducting-property
#9
Astam K Patra, Biplab Banerjee, Asim Bhaumik
Semiconduction nanoparticles are intensively studied due to their huge potential in optoelctronic applications. Here we report an efficient chemical route for hydrothermal synthesis of aggregated mesoporous cadmium sulfide (CdS) nanoparticles using supramolecular-assembly of ionic and water soluble sodium salicylate as the capping agent. The nanostructure, mesophase, optical property and photoconductivity of these mesoporous CdS materials have been characterized by using small and wide angle powder X-ray diffraction (XRD), transmission electron microscopy (TEM), scanning electron microscopy (SEM), N2-sorption, Raman analysis, Fourier transformed infrared (FT-IR), UV-Visible DSR spectroscopy, and photoconductivity measurement...
January 1, 2018: Journal of Nanoscience and Nanotechnology
https://www.readbyqxmd.com/read/29765555/a-protein-folding-molecular-imaging-biosensor-monitors-the-effects-of-drugs-that-restore-mutant-p53-structure-and-its-downstream-function-in-glioblastoma-cells
#10
Ramasamy Paulmurugan, Rayhaneh Afjei, Thillai V Sekar, Husam A Babikir, Tarik F Massoud
Misfolding mutations in the DNA-binding domain of p53 alter its conformation, affecting the efficiency with which it binds to chromatin to regulate target gene expression and cell cycle checkpoint functions in many cancers, including glioblastoma. Small molecule drugs that recover misfolded p53 structure and function may improve chemotherapy by activating p53-mediated senescence. We constructed and optimized a split Renilla luciferase (RLUC) complementation molecular biosensor (NRLUC-p53-CRLUC) to determine small molecule-meditated folding changes in p53 protein...
April 20, 2018: Oncotarget
https://www.readbyqxmd.com/read/29764582/-research-advances-in-the-role-of-aptamers-in-the-diagnosis-and-targeted-therapy-of-pediatric-cancer
#11
Yi-Bin Zhang, Yan-Peng Wang, Jing Liu
Aptamers are single-stranded DNA or RNA which are isolated from synthesized random oligonucleotide library in vitro via systematic evolution of ligands by exponential enrichment (SELEX) and can bind to metal ions, small molecules, carbohydrates, lipids, proteins, and others targets with high affinity and specificity. Aptamers have the advantages of simple preparation, good thermal stability, and low immunogenicity and have great potential in the medical fields such as molecular imaging, biosensing, early diagnosis of diseases, and targeted therapy...
May 2018: Zhongguo Dang Dai Er Ke za Zhi, Chinese Journal of Contemporary Pediatrics
https://www.readbyqxmd.com/read/29763549/development-of-positron-emission-tomography-pet-radiotracers-for-the-gaba-transporter-1-gat-1
#12
Alexandra R Sowa, Allen F Brooks, Xia Shao, Bradford D Henderson, Phillip S Sherman, Janna Arteaga, Jenelle Stauff, Adam C Lee, Robert A Koeppe, Peter J H Scott, Michael R Kilbourn
In vivo PET imaging of the γ-aminobutyric acid (GABA) receptor complex has been accomplished using radiolabeled benzodiazepine derivatives, but development of specific presynaptic radioligands targeting the neuronal membrane GABA transporter type 1 (GAT-1) has been less successful. The availability of new structure-activity studies of GAT-1 inhibitors and the introduction of a GAT-1 inhibitor (tiagabine, Gabatril® ) into clinical use prompted us to reinvestigate the syntheses of PET ligands for this transporter...
May 15, 2018: ACS Chemical Neuroscience
https://www.readbyqxmd.com/read/29762048/theranostics-of-prostate-cancer-from-molecular-imaging-to-precision-molecular-radiotherapy-targeting-the-prostate-specific-membrane-antigen
#13
Harshad R Kulkarni, Aviral Singh, Thomas Langbein, Christiane Schuchardt, Dirk Mueller, Jingjing Zhang, Coline Lehmann, Richard P Baum
Alterations at the molecular level are a hallmark of cancer. Prostate cancer is associated with the overexpression of prostate specific membrane antigen (PSMA) in a majority of cases, predominantly in advanced tumors, increasing with the grade or Gleason's score. PSMA can be selectively targeted using radiolabelled PSMA ligands. These small molecules binding the PSMA can be radiolabelled with gamma-emitters like 99m Tc and 111 In or positron emitters like 68 Ga and 18 F for diagnosis as well as with their theranostic pairs such as 177 Lu (beta-emitter) or 225 Ac (alpha-emitter) for therapy...
May 15, 2018: British Journal of Radiology
https://www.readbyqxmd.com/read/29753448/widefield-high-frame-rate-single-photon-spad-imagers-for-spim-fcs
#14
Jan Buchholz, Jan Krieger, Claudio Bruschini, Samuel Burri, Andrei Ardelean, Edoardo Charbon, Jörg Langowski
Photon-counting sensors based on standard complementary metal-oxide-semiconductor single-photon avalanche diodes (SPADs) represent an emerging class of imagers that enable the counting and/or timing of single photons at zero readout noise (better than high-speed electron-multiplying charge-coupling devices) and over large arrays. They have seen substantial progress over the last 15 years, increasing their spatial resolution, timing accuracy, and sensitivity while reducing spurious signals such as afterpulsing and dark counts...
May 9, 2018: Biophysical Journal
https://www.readbyqxmd.com/read/29752180/-177-lu-psma-617-radionuclide-treatment-in-patients-with-metastatic-castration-resistant-prostate-cancer-lupsma-trial-a-single-centre-single-arm-phase-2-study
#15
Michael S Hofman, John Violet, Rodney J Hicks, Justin Ferdinandus, Sue Ping Thang, Tim Akhurst, Amir Iravani, Grace Kong, Aravind Ravi Kumar, Declan G Murphy, Peter Eu, Price Jackson, Mark Scalzo, Scott G Williams, Shahneen Sandhu
BACKGROUND: Progressive metastatic castration-resistant prostate cancer is a highly lethal disorder and new effective therapeutic agents that improve patient outcomes are urgently needed. Lutetium-177 [177 Lu]-PSMA-617, a radiolabelled small molecule, binds with high affinity to prostate-specific membrane antigen (PSMA) enabling beta particle therapy targeted to metastatic castration-resistant prostate cancer. We aimed to investigate the safety, efficacy, and effect on quality of life of [177 Lu]-PSMA-617 in men with metastatic castration-resistant prostate cancer who progressed after standard treatments...
May 7, 2018: Lancet Oncology
https://www.readbyqxmd.com/read/29750532/proteomic-analysis-and-nir-ii-imaging-of-mcm2-protein-in-hepatocellular-carcinoma
#16
Jing Yang, Qi Xie, Hui Zhou, Lei Chang, Wei Wei, Yin Wang, Hong Li, Zixin Deng, Yuling Xiao, Junzhu Wu, Ping Xu, Xuechuan Hong
Targeted therapy of hepatocellular carcinoma (HCC) is essential for improved therapies. Therefore, identification of key targets specifically to HCC is an urgent requirement. Herein, an iTRAQ quantitative proteomic approach was employed to identify differentially expressed proteins in HCC tumor tissues. Of the upregulated tumor related proteins, minichromosome maintenance 2 (MCM2), a DNA replication licensing factor was one of the most significantly altered proteins, and its overexpression was confirmed using tissue microarray...
May 11, 2018: Journal of Proteome Research
https://www.readbyqxmd.com/read/29750499/alpha-synuclein-fibrils-contain-multiple-binding-sites-for-small-molecules
#17
Chia-Ju Hsieh, John J Ferrie, Kuiying Xu, Iljung Lee, Thomas J A Graham, Zhude Tu, Jennifer Yu, Dhruva Dhavale, Paul Kotzbauer, E James Petersson, Robert H Mach
The fibrillary aggregation of the protein alpha synuclein (Asyn) is a hallmark of Parkinson's disease, and the identification of small molecule binding sites on fibrils is essential to the development of diagnostic imaging probes. A series of molecular modelling, photoaffinity labeling, mass spectrometry, and radioligand binding studies were conducted on Asyn fibrils. The results of these studies revealed the presence of three different binding sites within fibrillar Asyn capable of binding small molecules with moderate to high affinity...
May 11, 2018: ACS Chemical Neuroscience
https://www.readbyqxmd.com/read/29743604/small-gtpases-and-bar-domain-proteins-regulate-branched-actin-polymerisation-for-clathrin-and-dynamin-independent-endocytosis
#18
Mugdha Sathe, Gayatri Muthukrishnan, James Rae, Andrea Disanza, Mukund Thattai, Giorgio Scita, Robert G Parton, Satyajit Mayor
Using real-time TIRF microscopy imaging, we identify sites of clathrin and dynamin-independent CLIC/GEEC (CG) endocytic vesicle formation. This allows spatio-temporal localisation of known molecules affecting CG endocytosis; GBF1 (a GEF for ARF1), ARF1 and CDC42 which appear sequentially over 60 s, preceding scission. In an RNAi screen for BAR domain proteins affecting CG endocytosis, IRSp53 and PICK1, known interactors of CDC42 and ARF1, respectively, were selected. Removal of IRSp53, a negative curvature sensing protein, abolishes CG endocytosis...
May 9, 2018: Nature Communications
https://www.readbyqxmd.com/read/29737160/a-wide-band-gap-polymer-with-a-deep-homo-level-enables-14-2-efficiency-in-polymer-solar-cells
#19
Sunsun Li, Long Ye, Wenchao Zhao, Hongping Yan, Bei Yang, Delong Liu, Wanning Li, Harald Ade, Jianhui Hou
To simultaneously achieve the low photon energy loss (Eloss) and the broad spectral response, the molecular design of the efficient wide band-gap (WBG) donor polymer with a deep HOMO level is of critical importance in fullerene-free polymer solar cells (PSCs). Herein, we developed a new benzodithiophene unit, i.e., DTBDT-EF and conducted systematic investigations on a WBG DTBDT-EF-based donor polymer, namely, PDTB-EF-T. Due to the synergistic electron-withdrawing effect of the fluorine atom and ester group, PDTB-EF-T exhibits higher oxidation potential, i...
May 8, 2018: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/29736713/high-content-imaging-phenotypic-screen-for-neurogenesis-using-primary-neural-progenitor-cells
#20
Li Sharon Wu, Jingjun Li
Neurogenesis phenotypic screen of small-molecule library enables the discovery of small-molecule inducers, and identification of associated biological targets and pathways that control neuronal formation from neural progenitor cells (NPCs). Here, we describe protocols for preparing mouse embryonic NPCs, setting up a high-content imaging assay that quantifies the production of Tuj1-labeled neurons, and analysis of high-throughput screens.
2018: Methods in Molecular Biology
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