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https://www.readbyqxmd.com/read/27913633/chemorepellent-semaphorin-3e-negatively-regulates-neutrophil-migration-in-vitro-and-in-vivo
#1
Hesam Movassagh, Abeer Saati, Saravanan Nandagopal, Ashfaque Mohammed, Nazanin Tatari, Lianyu Shan, Jonathan S Duke-Cohan, Keith R Fowke, Francis Lin, Abdelilah S Gounni
Neutrophil migration is an essential step in leukocyte trafficking during inflammatory responses. Semaphorins, originally discovered as axon guidance cues in neural development, have been shown to regulate cell migration beyond the nervous system. However, the potential contribution of semaphorins in the regulation of neutrophil migration is not well understood. This study examines the possible role of a secreted chemorepellent, Semaphorin 3E (Sema3E), in neutrophil migration. In this study, we demonstrated that human neutrophils constitutively express Sema3E high-affinity receptor, PlexinD1...
December 2, 2016: Journal of Immunology: Official Journal of the American Association of Immunologists
https://www.readbyqxmd.com/read/27913249/comparison-of-the-transcriptomic-profile-of-hepatic-human-induced-pluripotent-stem-like-cells-cultured-in-plates-and-in-a-3d-microscale-dynamic-environment
#2
Eric Leclerc, Keiichi Kimura, Marie Shinohara, Mathieu Danoy, Morgane Le Gall, Taketomo Kido, Atsushi Miyajima, Teruo Fujii, Yasuyuki Sakai
We have compared the transcriptomic profiles of human induced pluripotent stem cells after their differentiation in hepatocytes like cells in plates and microfluidic biochips. The biochips provided a 3D and dynamic support during the cell differentiation when compared to the 2D static cultures in plates. The microarray have demonstrated the up regulation of important pathway related to liver development and maturation during the culture in biochips. Furthermore, the results of the transcriptomic profile, coupled with immunostaining, and RTqPCR analysis have shown typical biomarkers illustrating the presence of responders of biliary like cells, hepatocytes like cells, and endothelial like cells...
November 29, 2016: Genomics
https://www.readbyqxmd.com/read/27911816/rapid-emergence-and-mechanisms-of-resistance-by-u87-glioblastoma-cells-to-doxorubicin-in-an-in-vitro-tumor-microfluidic-ecology
#3
Jeonghun Han, Yukyung Jun, So Hyun Kim, Hong-Hoa Hoang, Yeonjoo Jung, Suyeon Kim, Jaesang Kim, Robert H Austin, Sanghyuk Lee, Sungsu Park
In vitro prediction of the probable rapid emergence of resistance to a drug in tumors could act to winnow out potential candidates for further costly development. We have developed a microfluidic device consisting of ∼500 hexagonal microcompartments that provides a complex ecology with wide ranges of drug and nutrient gradients and local populations. This ecology of a fragmented metapopulation induced the drug resistance in stage IV U87 glioblastoma cells to doxorubicin in 7 d. Exome and transcriptome sequencing of the resistant cells identified mutations and differentially expressed genes...
November 22, 2016: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/27911378/iridium-oxide-reduced-graphene-oxide-nanohybrid-thin-film-modified-screen-printed-electrodes-as-disposable-electrochemical-paper-microfluidic-ph-sensors
#4
Jiang Yang, Tae-Joon Kwak, Xiaodong Zhang, Robert McClain, Woo-Jin Chang, Sundaram Gunasekaran
A facile, controllable, inexpensive and green electrochemical synthesis of IrO2-graphene nanohybrid thin films is developed to fabricate an easy-to-use integrated paper microfluidic electrochemical pH sensor for resource-limited settings. Taking advantages from both pH meters and strips, the pH sensing platform is composed of hydrophobic barrier-patterned paper micropad (µPAD) using polydimethylsiloxane (PDMS), screen-printed electrode (SPE) modified with IrO2-graphene films and molded acrylonitrile butadiene styrene (ABS) plastic holder...
November 22, 2016: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/27911223/advances-in-capillary-electrophoresis-and-the-implications-for-drug-discovery
#5
Claire M Ouimet, Cara I D'Amico, Robert T Kennedy
Many screening platforms are prone to assay interferences that can be avoided by directly measuring the target or enzymatic product. Capillary electrophoresis (CE) and microchip electrophoresis (MCE) have been applied in a variety of formats to drug discovery. CE provides direct detection of the product allowing for the identification of some forms of assay interference. The high efficiency, rapid separations, and low volume requirements make CE amenable to drug discovery. Areas Covered: This article describes advances in capillary electrophoresis throughput, sample introduction, and target assays as they pertain to drug discovery and screening...
December 2, 2016: Expert Opinion on Drug Discovery
https://www.readbyqxmd.com/read/27910892/dynamic-microenvironment-induces-phenotypic-plasticity-of-esophageal-cancer-cells-under-flow
#6
Gizem Calibasi Kocal, Sinan Güven, Kira Foygel, Aaron Goldman, Pu Chen, Shiladitya Sengupta, Ramasamy Paulmurugan, Yasemin Baskin, Utkan Demirci
Cancer microenvironment is a remarkably heterogeneous composition of cellular and non-cellular components, regulated by both external and intrinsic physical and chemical stimuli. Physical alterations driven by increased proliferation of neoplastic cells and angiogenesis in the cancer microenvironment result in the exposure of the cancer cells to elevated levels of flow-based shear stress. We developed a dynamic microfluidic cell culture platform utilizing eshopagael cancer cells as model cells to investigate the phenotypic changes of cancer cells upon exposure to fluid shear stress...
December 2, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27910869/multiparameter-mechanical-and-morphometric-screening-of-cells
#7
Mahdokht Masaeli, Dewal Gupta, Sean O'Byrne, Henry T K Tse, Daniel R Gossett, Peter Tseng, Andrew S Utada, Hea-Jin Jung, Stephen Young, Amander T Clark, Dino Di Carlo
We introduce a label-free method to rapidly phenotype and classify cells purely based on physical properties. We extract 15 biophysical parameters from cells as they deform in a microfluidic stretching flow field via high-speed microscopy and apply machine-learning approaches to discriminate different cell types and states. When employing the full 15 dimensional dataset, the technique robustly classifies individual cells based on their pluripotency, with accuracy above 95%. Rheological and morphological properties of cells while deforming were critical for this classification...
December 2, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27910588/online-measurements-of-surface-tensions-and-viscosities-based-on-the-hydrodynamics-of-taylor-flow-in-a-microchannel
#8
Yanhong Sun, Chaohong Guo, Yuyan Jiang, Tao Wang, Lei Zhang
This paper demonstrates an online measurement technique which can measure both surface tension and viscosity for confined fluids in microfluidic systems. The surface tension and viscosity are determined by monitoring the liquid film thickness deposited in a microchannel based on the hydrodynamics of Taylor flow. Measurements were carried out for pure liquids and binary aqueous liquid mixtures. The results agreed well with reference data and theoretical models. This novel method has considerable potential for measuring dynamic interfacial tension of complex mixtures...
November 2016: Review of Scientific Instruments
https://www.readbyqxmd.com/read/27909898/two-dimensional-polyaniline-nanostructure-to-the-development-of-microfluidic-integrated-flexible-biosensors-for-biomarker-detection
#9
Pei Liu, Yisi Zhu, Seung Hee Lee, Minhee Yun
In this work, we report a flexible field-effect-transistor (FET) biosensor design based on two-dimensional (2-D) polyaniline (PANI) nanostructure. The flexible biosensor devices were fabricated through a facile and inexpensive method that combines top-down and bottom-up processes. The chemically synthesized PANI nanostructure showed excellent p-type semiconductor properties as well as good compatibility with flexible design. With the 2-D PANI nanostructure being as thin as 80 nm and its extremely large surface-area-to-volume (SA/V) ratio due to the intrinsic properties of PANI chemical synthesis, the developed flexible biosensor exhibited outstanding sensing performance in detecting B-type natriuretic peptide (BNP) biomarkers, and was able to achieve high specificity (averagely 112 folds) with the limit of detection as low as 100 pg/mL...
December 2016: Biomedical Microdevices
https://www.readbyqxmd.com/read/27909706/out-of-plane-integration-of-a-multimode-optical-fiber-for-single-particle-cell-detection-at-multiple-points-on-a-microfluidic-device-with-applications-to-particle-cell-counting-velocimetry-size-discrimination-and-the-analysis-of-single-cell-lysate-injections
#10
Jalal Sadeghi, Damith E W Patabadige, Anne H Culbertson, Hamid Latifi, Christopher T Culbertson
In this paper a single particle/cell-tracking microfluidic device that integrates an out-of-plane multimode optical fiber (OP-MMF) is reported. This OP-MMF is used to generate three excitation light-lines and three detection spots using only one excitation source and one detector. It takes advantage of an optical tunneling mode to create two excitation lines in a microfluidic channel emanating from a single fiber end. This method was used to accurately count particles/cells and perform velocity measurements and size discrimination...
December 2, 2016: Lab on a Chip
https://www.readbyqxmd.com/read/27909335/lignin-aunps-liquid-marble-for-remotely-controllable-detection-of-pb-2
#11
Guocheng Han, Xiaoying Wang, Jonathan Hamel, Hongli Zhu, Runcang Sun
This work reported the green and facile fabrication of a versatile lignin-AuNP composite, which was readily and remotely encapsulated to form novel liquid marbles. The marbles can stay suspended in water, and show excellent photothermal conversion properties, as well as visual detection and adsorption towards Pb(2+). More importantly, the marbles can simultaneously remotely detect and adsorb Pb(2+) via co-precipitation by simply controlling the near infrared (NIR) irradiation. It is believed that the remotely-controllable NIR-responsive lignin-AuNPs liquid marble can be used in Pb(2+)-related reactions...
December 2, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27908499/a-strategy-to-modulate-the-electrophoretic-behavior-in-plastic-microchips-using-sodium-polystyrene-sulfonate
#12
Jinxiu Guo, Yu Chen, Lizhi Zhao, Ping Sun, Hongli Li, Lei Zhou, Xiayan Wang, Qiaosheng Pu
Plastic microchips have been broadly used as disposable microfluidic devices, but the poorly defined surface properties limit their application. Herein, we proved that an anionic polymer could be used as the background electrolyte (BGE) to provide a strong and stable cathodic electroosmotic flow (EOF) and modulate the electrophoretic behavior for efficient separation in relative thicker microchannels (∼75μm id). A cathodic EOF of ∼3.3×10(-4)cm(2)V(-1)s(-1) was maintained using sodium polystyrene sulfonate (PSSNa) with a molecular weight of 5×10(5) as the BGE, which ensured fluorescein isothiocyanate labeled biogenic amines (BAs) appeared ahead of other components in the electropherograms obtained with microchips of cyclic olefin copolymer...
November 23, 2016: Journal of Chromatography. A
https://www.readbyqxmd.com/read/27907085/the-natural-variation-in-lifespans-of-single-yeast-cells-is-related-to-variation-in-cell-size-ribosomal-protein-and-division-time
#13
Georges E Janssens, Liesbeth M Veenhoff
There is a large variability in lifespans of individuals even if they are genetically identical and raised under the same environmental conditions. Our recent system wide study of replicative aging in baker's yeast predicts that protein biogenesis is a driver of aging. Here, we address how the natural variation in replicative lifespan within wild-type populations of yeast cells correlates to three biogenesis-related parameters, namely cell size, ribosomal protein Rpl13A-GFP levels, and division times. Imaging wild type yeast cells in microfluidic devices we observe that in all cells and at all ages, the division times as well as the increase in cell size that single yeast undergo while aging negatively correlate to their lifespan...
2016: PloS One
https://www.readbyqxmd.com/read/27906393/geometric-control-of-active-collective-motion
#14
Maxime Theillard, Roberto Alonso-Matilla, David Saintillan
Recent experimental studies have shown that confinement can profoundly affect self-organization in semi-dilute active suspensions, leading to striking features such as the formation of steady and spontaneous vortices in circular domains and the emergence of unidirectional pumping motions in periodic racetrack geometries. Motivated by these findings, we analyze the two-dimensional dynamics in confined suspensions of active self-propelled swimmers using a mean-field kinetic theory where conservation equations for the particle configurations are coupled to the forced Navier-Stokes equations for the self-generated fluid flow...
December 1, 2016: Soft Matter
https://www.readbyqxmd.com/read/27906309/spiral-phase-mask-shadow-imaging-for-3d-measurement-of-flow-fields
#15
Martin Teich, Michael Mattern, Jeremy Sturm, Lars Büttner, Jürgen W Czarske
Particle tracking velocimetry (PTV) is a valuable tool for microfluidic analysis. Especially mixing processes and the environmental interaction of fluids on a microscopic scale are of particular importance for pharmaceutical and biomedical applications. However, currently applied techniques suffer from the lag of instantaneous depth information. Here we present a scan-free, shadow-imaging PTV-technique for 3D trajectory and velocity measurement of flow fields in micro-channels with 2 µm spatial resolution...
November 28, 2016: Optics Express
https://www.readbyqxmd.com/read/27906134/tumour-suppressor-micrornas-regulate-ovarian-cancer-cell-physical-properties-and-invasive-behaviour
#16
Clara K Chan, Yinghong Pan, Kendra Nyberg, Marco A Marra, Emilia L Lim, Steven J M Jones, Dianna Maar, Ewan A Gibb, Preethi H Gunaratne, A Gordon Robertson, Amy C Rowat
The activities of pathways that regulate malignant transformation can be influenced by microRNAs (miRs). Recently, we showed that increased expression of five tumour-suppressor miRs, miR-508-3p, miR-508-5p, miR-509-3p, miR-509-5p and miR-130b-3p, correlate with improved clinical outcomes in human ovarian cancer patients, and that miR-509-3p attenuates invasion of ovarian cancer cell lines. Here, we investigate the mechanism underlying this reduced invasive potential by assessing the impact of these five miRs on the physical properties of cells...
November 2016: Open Biology
https://www.readbyqxmd.com/read/27906039/peering-below-the-diffraction-limit-robust-and-specific-sorting-of-viruses-with-flow-cytometry
#17
Shea T Lance, David J Sukovich, Kenneth M Stedman, Adam R Abate
BACKGROUND: Viruses are incredibly diverse organisms and impact all forms of life on Earth; however, individual virions are challenging to study due to their small size and mass, precluding almost all direct imaging or molecular analysis. Moreover, like microbes, the overwhelming majority of viruses cannot be cultured, impeding isolation, replication, and study of interesting new species. Here, we introduce PCR-activated virus sorting, a method to isolate specific viruses from a heterogeneous population...
December 1, 2016: Virology Journal
https://www.readbyqxmd.com/read/27904893/assay-for-listeria-monocytogenes-cells-in-whole-blood-using-isotachophoresis-and-recombinase-polymerase-amplification
#18
Charbel Eid, Juan G Santiago
We present a new approach which enables lysis, extraction, and detection of inactivated Listeria monocytogenes cells from blood using isotachophoresis (ITP) and recombinase polymerase amplification (RPA). We use an ITP-compatible alkaline and proteinase K approach for rapid and effective lysis. We then perform ITP purification to separate bacterial DNA from whole blood contaminants using a microfluidic device that processes 25 μL sample volume. Lysis, mixing, dispensing, and on-chip ITP purification are completed in a total of less than 50 min...
December 1, 2016: Analyst
https://www.readbyqxmd.com/read/27902940/a-novel-lab-on-chip-platform-with-integrated-solid-phase-pcr-and-supercritical-angle-fluorescence-saf-microlens-array-for-highly-sensitive-and-multiplexed-pathogen-detection
#19
Tran Quang Hung, Wai Hoe Chin, Yi Sun, Anders Wolff, Dang Duong Bang
Solid-phase PCR (SP-PCR) has become increasingly popular for molecular diagnosis and there have been a few attempts to incorporate SP-PCR into lab-on-a-chip (LOC) devices. However, their applicability for on-line diagnosis is hindered by the lack of sensitive and portable on-chip optical detection technology. In this paper, we addressed this challenge by combining the SP-PCR with super critical angle fluorescence (SAF) microlens array embedded in a microchip. We fabricated miniaturized SAF microlens array as part of a microfluidic chamber in thermoplastic material and performed multiplexed SP-PCR directly on top of the SAF microlens array...
November 12, 2016: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/27901159/a-portable-and-reconfigurable-multi-organ-platform-for-drug-development-with-onboard-microfluidic-flow-control
#20
J R Coppeta, M J Mescher, B C Isenberg, A J Spencer, E S Kim, A R Lever, T J Mulhern, R Prantil-Baun, J C Comolli, J T Borenstein
The drug development pipeline is severely limited by a lack of reliable tools for prediction of human clinical safety and efficacy profiles for compounds at the pre-clinical stage. Here we present the design and implementation of a platform technology comprising multiple human cell-based tissue models in a portable and reconfigurable format that supports individual organ function and crosstalk for periods of up to several weeks. Organ perfusion and crosstalk are enabled by a precision flow control technology based on electromagnetic actuators embedded in an arrayed format on a microfluidic platform...
November 30, 2016: Lab on a Chip
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