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https://www.readbyqxmd.com/read/28098320/versatile-tissue-lasers-based-on-high-q-fabry-p%C3%A3-rot-microcavities
#1
Yu-Cheng Chen, Qiushu Chen, Tingting Zhang, Wenjie Wang, Xudong Fan
Biolasers are an emerging technology for next generation biochemical detection and clinical applications. Progress has recently been made to achieve lasing from biomolecules and single living cells. Tissues, which consist of cells embedded in an extracellular matrix, mimic more closely the actual complex biological environment in a living body and therefore are of more practical significance. Here, we developed a highly versatile tissue laser platform, in which tissues stained with fluorophores are sandwiched in a high-Q Fabry-Pérot microcavity...
January 18, 2017: Lab on a Chip
https://www.readbyqxmd.com/read/28097798/discovery-of-novel-cinchona-alkaloid-inspired-oxazatwistane-autophagy-inhibitors
#2
Luca Laraia, Kosuke Ohsawa, Georgios Konstantinidis, Lucas Robke, Yao-Wen Wu, Kamal Kumar, Herbert Waldmann
The cinchona alkaloids are a privileged class of natural products and are endowed with diverse bioactivities. However, for compounds with the closely-related oxazatricyclo[4.4.0.0]decane ("oxazatwistane") scaffold, which are accessible from cinchonidine and quinidine by means of ring distortion and modification, biological activity has not been identified. We report the synthesis of an oxazatwistane compound collection through employing state-of-the-art C-H functionalization, and metal-catalyzed cross-coupling reactions as key late diversity-generating steps...
January 18, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28097495/the-expression-of-hypoxia-inducible-factor-1%C3%AE-gene-is-not-affected-by-low-oxygen-conditions-in-yellow-perch-perca-flavescens-juveniles
#3
Karolina Kwasek, Simona Rimoldi, Anna Giulia Cattaneo, Timothy Parker, Konrad Dabrowski, Genciana Terova
Hypoxia can affect various fish populations, including yellow perch Perca flavescens, which is an economically and ecologically important species in Lake Erie, a freshwater system that often experiences hypoxia in the hypolimnetic part of the lake. Fish, similarly to mammals, possess molecular oxygen sensor-hypoxia-inducible factor-1 (HIF-1), a transcription factor that can affect expression of many downstream genes related to animal growth and locomotion, protein synthesis, as well as ATP and amino acid metabolism...
January 18, 2017: Fish Physiology and Biochemistry
https://www.readbyqxmd.com/read/28097494/establishment-and-characterization-of-a-heart-derived-cell-line-from-goldfish-carassius-auratus
#4
Hongli Jing, Xiangmei Lin, Lipu Xu, Longying Gao, Min Zhang, Na Wang, Shaoqiang Wu
The goldfish Carassius auratus, a freshwater fish in the family Cyprinidae, was one of the earliest fish to be domesticated for ornamental purposes. A cell line was established from goldfish heart (GH) tissue to create a biological monitoring tool for viral diseases. The GH cell line was optimally maintained at 25 °C in M199 medium supplemented with 10-20% fetal bovine serum. A chromosomal analysis indicated that the cell line remained diploid, with a mean chromosomal count of 100. In viral inoculation assays, significant cytopathic effects (CPEs) were caused by epizootic hematopoietic necrosis virus (EHNV), Andrias davidianus iridovirus (ADIV), and Bohle iridovirus (BIV) infections in the fish cells and the viral titers (average value) of EHNV, ADIV, and BIV in GH cells reached 10(5...
January 18, 2017: Fish Physiology and Biochemistry
https://www.readbyqxmd.com/read/28095825/no-regrets-young-adult-patients-in-psychiatry-report-positive-reactions-to-biobank-participation
#5
Janet L Cunningham, Manuel Zanzi, Mimmie Willebrand, Lisa Ekselius, Mia Ramklint
BACKGROUND: Research in vulnerable individuals must insure voluntariness and minimize negative reactions caused by participation. This study aimed to describe consent and completion rate in young psychiatric patients in relation to study components, degree of disability and to compare response to research participation in patients and controls. METHODS: Between 2012 and 2015, 463 patients with psychiatric disorders between the ages of 18-25 from the Dept. of General Psychiatry at Uppsala University Hospital and 105 controls were recruited to donate data and samples to a biobank...
January 17, 2017: BMC Psychiatry
https://www.readbyqxmd.com/read/28095683/colorimetric-detection-of-staphylococcus-aureus-contaminated-solutions-without-purification
#6
Pamela Tiet, Karen C Clark, James O McNamara, Jacob M Berlin
Current water quality monitoring methods rely on growth-based measurements to detect fecal indicator bacteria, such as Escherichia coli and enterococci, and Staphylococcus aureus (S. aureus). These growth-based measurements, however, can take days to complete. This is a significant limitation in the evaluation of contaminated food and water sources. Various methods for selective in vitro detection of S. aureus have also been reported; however, these strategies, such as ELISA, agar-diffusion, PCR, or liquid chromatography-tandem mass spectrometry, all require overnight culturing or sophisticated instrumentation...
January 18, 2017: Bioconjugate Chemistry
https://www.readbyqxmd.com/read/28095620/tools-for-live-imaging-of-active-rho-gtpases-in-xenopus
#7
REVIEW
Rachel E Stephenson, Ann L Miller
Rho family GTPases are signaling molecules that orchestrate cytoskeletal dynamics in a variety of cellular processes. Because they effect localized changes to the cytoskeleton only in their active (GTP-bound) conformation, the ability to monitor the active state of Rho GTPases in space and time is critical for understanding their function. Here, we summarize popular tools used for live imaging of active Rho GTPases, outlining advantages and drawbacks of these approaches. Additionally, we highlight key features of the Xenopus laevis embryo that make it well-suited for epithelial cell biology and discuss how application of Rho activity reporters in the Xenopus laevis embryo led to the discovery of a novel phenomenon, junctional Rho flares...
January 17, 2017: Genesis: the Journal of Genetics and Development
https://www.readbyqxmd.com/read/28095260/differential-expression-and-roles-of-secreted-frizzled-related-protein-5-and-the-wingless-homolog-wnt5a-in-periodontitis
#8
T Maekawa, P Kulwattanaporn, K Hosur, H Domon, M Oda, Y Terao, T Maeda, G Hajishengallis
The Wingless/integrase-1 (Wnt) family of protein ligands and their functional antagonists, secreted frizzled-related proteins (sFRPs), regulate various biological processes ranging from embryonic development to immunity and inflammation. Wnt5a and sFRP5 comprise a typical ligand/antagonist pair, and the former molecule was recently detected at the messenger RNA (mRNA) level in human periodontitis. The main objective of this study was to investigate the interrelationship of expression of Wnt5a and sFRP5 in human periodontitis (as compared to health) and to determine their roles in inflammation and bone loss in an animal model...
January 1, 2017: Journal of Dental Research
https://www.readbyqxmd.com/read/28094889/selective-electrochemical-bleaching-of-the-outer-leaflet-of-fluorescently-labelled-giant-liposomes
#9
Olivier Buriez, Ana Isabel Perez Jimenez, Lylian Challier, Eric Aït-Yahiatène, Jerome Delacotte, Eric Labbe
Electrochemistry and confocal fluorescence microscopy were successfully combined to selectively bleach and monitor the fluorescence of NBD-labelled phospholipids of giant liposomes. Three types of giant unilamellar vesicles have been investigated, the fluorescent phospholipids being localized either mainly on their outer-, inner-, or both inner/outer leaflets. We established that only the fluorescent lipids incorporated in the outer leaflet of the vesicles underwent electrochemical bleaching upon reduction...
January 17, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28094274/folivory-elicits-a-strong-defense-reaction-in-catharanthus-roseus-metabolomic-and-transcriptomic-analyses-reveal-distinct-local-and-systemic-responses
#10
Thomas Dugé de Bernonville, Inês Carqueijeiro, Arnaud Lanoue, Florent Lafontaine, Paloma Sánchez Bel, Franziska Liesecke, Karine Musset, Audrey Oudin, Gaëlle Glévarec, Olivier Pichon, Sébastien Besseau, Marc Clastre, Benoit St-Pierre, Victor Flors, Stéphane Maury, Elisabeth Huguet, Sarah E O'Connor, Vincent Courdavault
Plants deploy distinct secondary metabolisms to cope with environment pressure and to face bio-aggressors notably through the production of biologically active alkaloids. This metabolism-type is particularly elaborated in Catharanthus roseus that synthesizes more than a hundred different monoterpene indole alkaloids (MIAs). While the characterization of their biosynthetic pathway now reaches completion, still little is known about the role of MIAs during biotic attacks. As a consequence, we developed a new plant/herbivore interaction system by challenging C...
January 17, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28094206/hepatocyte-growth-factor-in-physiology-and-infectious-diseases
#11
REVIEW
Ryu Imamura, Kunio Matsumoto
Hepatocyte growth factor (HGF) is a pleiotropic cytokine composed of an α-chain and a β-chain, and these chains contain four kringle domains and a serine protease-like structure, respectively. The receptor for HGF was identified as the c-met proto-oncogene product of transmembrane receptor tyrosine kinase. HGF-induced signaling through the receptor Met provokes dynamic biological responses that support morphogenesis, regeneration, and the survival of various cells and tissues, which includes hepatocytes, renal tubular cells, and neurons...
January 13, 2017: Cytokine
https://www.readbyqxmd.com/read/28093460/a-double-edged-sword-does-highly-active-antiretroviral-therapy-contribute-to-syphilis-incidence-by-impairing-immunity-to-treponema-pallidum
#12
REVIEW
Michael L Rekart, Wilfred Ndifon, Robert C Brunham, Jonathan Dushoff, Sang Woo Park, Sanjana Rawat, Caroline E Cameron
BACKGROUND AND HYPOTHESIS: Recently, the world has experienced a rapidly escalating outbreak of infectious syphilis primarily affecting men who have sex with men (MSM); many are taking highly active antiretroviral therapy (HAART) for HIV-1 infection. The prevailing hypothesis is that HAART availability and effectiveness have led to the perception among both individuals who are HIV-1 infected and those who are uninfected that HIV-1 transmission has become much less likely, and the effects of HIV-1 infection less deadly...
January 16, 2017: Sexually Transmitted Infections
https://www.readbyqxmd.com/read/28093274/a-direct-quantitative-pcr-based-measurement-of-herpes-simplex-virus-susceptibility-to-antiviral-drugs-and-neutralizing-antibodies
#13
Dezső P Virók, Ildikó Eszik, Tímea Mosolygó, Kamil Önder, Valéria Endrész, Katalin Burián
Herpes simplex viruses (HSV) are common human pathogens that can cause painful but benign manifestations and recurrent complaints, but can also cause significant morbidity and mortality on infection of the eye or brain and with disseminated infection of an immunosuppressed patient or a neonate. HSV growth inhibition measurement by plaque or yield reduction is a key task in the development of novel antiviral compounds but the manual methods are very labour intensive. The sensitive and specific PCR technology could be an effective method for quantitation of HSV DNA related to virus replication; however the currently described PCR approaches have a major limitation, namely the requirement of purification of DNA from the infected cells...
January 13, 2017: Journal of Virological Methods
https://www.readbyqxmd.com/read/28093122/sequential-enzymatic-derivatization-coupled-with-online-microdialysis-sampling-for-simultaneous-profiling-of-mouse-tumor-extracellular-hydrogen-peroxide-lactate-and-glucose
#14
Cheng-Kuan Su, Po-Jen Tseng, Hsien-Ting Chiu, Andrea Del Vall, Yu-Fen Huang, Yuh-Chang Sun
Probing tumor extracellular metabolites is a vitally important issue in current cancer biology. In this study an analytical system was constructed for the in vivo monitoring of mouse tumor extracellular hydrogen peroxide (H2O2), lactate, and glucose by means of microdialysis (MD) sampling and fluorescence determination in conjunction with a smart sequential enzymatic derivatization scheme-involving a loading sequence of fluorogenic reagent/horseradish peroxidase, microdialysate, lactate oxidase, pyruvate, and glucose oxidase-for step-by-step determination of sampled H2O2, lactate, and glucose in mouse tumor microdialysate...
March 1, 2017: Analytica Chimica Acta
https://www.readbyqxmd.com/read/28092500/a-model-of-a-synthetic-biological-communication-interface-between-mammalian-cells-and-mechatronic-systems
#15
Keith C Heyde, Warren C Ruder
The creation of communication interfaces between abiotic and biotic systems represents a significant research challenge. In this work, we design and model a system linking the biochemical signaling pathways of mammalian cells to the actions of a mobile robotic prosthesis. We envision this system as a robotic platform carrying an optically monitored bioreactor that harbors mammalian cells. The cellular, optical signal is captured by an onboard fluorescent microscope and converted into an electronic signal. We first present a design for the overall cell-robot system, with a specific focus on the design of the synthetic gene networks needed for the system...
December 2016: IEEE Transactions on Nanobioscience
https://www.readbyqxmd.com/read/28092358/recurrent-rna-motifs-as-scaffolds-for-genetically-encodable-small-molecule-biosensors
#16
Ely B Porter, Jacob T Polaski, Makenna M Morck, Robert T Batey
Allosteric RNA devices are increasingly being viewed as important tools capable of monitoring enzyme evolution, optimizing engineered metabolic pathways, facilitating gene discovery and regulators of nucleic acid-based therapeutics. A key bottleneck in the development of these platforms is the availability of small-molecule-binding RNA aptamers that robustly function in the cellular environment. Although aptamers can be raised against nearly any desired target through in vitro selection, many cannot easily be integrated into devices or do not reliably function in a cellular context...
January 16, 2017: Nature Chemical Biology
https://www.readbyqxmd.com/read/28092053/sh2-domain-based-fret-biosensor-for-measuring-bcr-abl-activity-in-living-cml-cells
#17
Mari Fujioka, Yumi Asano, Shigeyuki Nakada, Yusuke Ohba
Fluorescent proteins (FPs) displaying distinct spectra have shed their light on a wide range of biological functions. Moreover, sophisticated biosensors engineered to contain single or multiple FPs, including Förster resonance energy transfer (FRET)-based biosensors, spatiotemporally reveal the molecular mechanisms underlying a variety of pathophysiological processes. However, their usefulness for applied life sciences has yet to be fully explored. Recently, our research group has begun to expand the potential of FPs from basic biological research to the clinic...
2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/28092052/real-time-single-molecule-visualization-of-sh2-domain-membrane-recruitment-in-growth-factor-stimulated-cells
#18
Dongmyung Oh
In the last decade, single molecule tracking (SMT) techniques have emerged as a versatile tool for molecular cell biology research. This approach allows researchers to monitor the real-time behavior of individual molecules in living cells with nanometer and millisecond resolution. As a result, it is possible to visualize biological processes as they occur at a molecular level in real time. Here we describe a method for the real-time visualization of SH2 domain membrane recruitment from the cytoplasm to epidermal growth factor (EGF) induced phosphotyrosine sites on the EGF receptor...
2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/28091604/polyglucose-nanoparticles-with-renal-elimination-and-macrophage-avidity-facilitate-pet-imaging-in-ischaemic-heart-disease
#19
Edmund J Keliher, Yu-Xiang Ye, Gregory R Wojtkiewicz, Aaron D Aguirre, Benoit Tricot, Max L Senders, Hannah Groenen, Francois Fay, Carlos Perez-Medina, Claudia Calcagno, Giuseppe Carlucci, Thomas Reiner, Yuan Sun, Gabriel Courties, Yoshiko Iwamoto, Hye-Yeong Kim, Cuihua Wang, John W Chen, Filip K Swirski, Hsiao-Ying Wey, Jacob Hooker, Zahi A Fayad, Willem J M Mulder, Ralph Weissleder, Matthias Nahrendorf
Tissue macrophage numbers vary during health versus disease. Abundant inflammatory macrophages destruct tissues, leading to atherosclerosis, myocardial infarction and heart failure. Emerging therapeutic options create interest in monitoring macrophages in patients. Here we describe positron emission tomography (PET) imaging with (18)F-Macroflor, a modified polyglucose nanoparticle with high avidity for macrophages. Due to its small size, Macroflor is excreted renally, a prerequisite for imaging with the isotope flourine-18...
January 16, 2017: Nature Communications
https://www.readbyqxmd.com/read/28089547/antibody-profiles-to-wheat-germ-cell-free-system-synthesized-plasmodium-falciparum-proteins-correlate-with-protection-from-symptomatic-malaria-in-uganda
#20
Bernard N Kanoi, Eizo Takashima, Masayuki Morita, Michael T White, Nirianne M Q Palacpac, Edward H Ntege, Betty Balikagala, Adoke Yeka, Thomas G Egwang, Toshihiro Horii, Takafumi Tsuboi
The key targets of protective antibodies against Plasmodium falciparum remain largely unknown. In this study, we determined immunoreactivity to 1827 recombinant proteins derived from 1565 genes representing ∼30% of the entire P. falciparum genome, for identification of novel malaria vaccine candidates. The recombinant proteins were expressed by wheat germ cell-free system, a platform that can synthesize quality plasmodial proteins that elicit biologically active antibodies in animals. Sera were obtained from indigenous residents of a malaria endemic region in Northern Uganda who were enrolled at the start of a rainy season and prospectively monitored for symptomatic malaria episodes for a year...
January 12, 2017: Vaccine
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