keyword
MENU ▼
Read by QxMD icon Read
search

Live cell imaging

keyword
https://www.readbyqxmd.com/read/29054027/sapofectosid-ensuring-non-toxic-and-effective-dna-and-rna-delivery
#1
Simko Sama, Gerold Jerz, Peter Schmieder, Eric Woith, Matthias F Melzig, Alexander Weng
Different methods are being deployed for non-viral DNA/RNA delivery. However non-viral formulations for DNA/RNA-delivery are often accompanied by severe toxicity and thus low efficiency. Particular costly cell culture media are required as well. Here we introduce sapofection as a valuable enhancing method for non-viral DNA/RNA delivery. Sapofection is based on the application of DNA/RNA nanoplexes and sapofectosid, a plant derived natural transfection reagent. Sapofectosid was produced from plant raw material by chromatographic methods and characterized by tandem mass spectrometry and intensive one and two dimensional NMR-spectroscopy...
October 17, 2017: International Journal of Pharmaceutics
https://www.readbyqxmd.com/read/29053920/turn-on-fluorene-push-pull-probes-with-high-brightness-and-photostability-for-visualizing-lipid-order-in-biomembranes
#2
Janah Shaya, Mayeul Collot, Frédéric Benailly, Najiba Mahmoud, Yves Mély, Benoît Y Michel, Andrey S Klymchenko, Alain Burger
The rational design of environment-sensitive dyes with superior properties is critical for elucidating the fundamental biological processes and understanding the biophysical behavior of cell membranes. In this study, a novel group of fluorene-based push-pull probes was developed for imaging membrane lipids. The design of these fluorogenic conjugates is based on a propioloyl linker to preserve the required spectroscopic features of the core dye. This versatile linker allowed the introduction of a polar deoxyribosyl head, a lipophilic chain, and an amphiphilic/anchoring group to tune the cell membrane binding and internalization...
October 20, 2017: ACS Chemical Biology
https://www.readbyqxmd.com/read/29053693/in-vivo-tracking-of-human-adipose-derived-mesenchymal-stem-cells-in-a-rat-knee-osteoarthritis-model-with-fluorescent-lipophilic-membrane-dye
#3
Meng Li, Ming Hao, Dong Jiang, Yanxi Chen, Wen Wang
In order to support the clinical application of human adipose-derived mesenchymal stem cell (haMSC) therapy for knee osteoarthritis (KOA), we examined the efficacy of cell persistence and biodistribution of haMSCs in animal models. We demonstrated a method to label the cell membrane of haMSCs with lipophilic fluorescent dye. Subsequently, intra-articular injection of the labeled cells in rats with surgically induced KOA was monitored dynamically by an in vivo imaging system. We employed the lipophilic carbocyanines DiD (DilC18 (5)), a far-red fluorescent Dil (dialkylcarbocyanines) analog, which utilized a red laser to avoid excitation of the natural green autofluorescence from surrounding tissues...
October 8, 2017: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/29052680/progressive-structural-modification-to-a-zinc-actuated-photoinduced-electron-transfer-pet-switch-in-the-context-of-intracellular-zinc-imaging
#4
Miguel Macias-Contreras, Kirsten L Daykin, J Tyler Simmons, John R Allen, Zachary S Hooper, Michael W Davidson, Lei Zhu
Photoinduced electron transfer (PeT)-type fluorescent molecular switches are often applied in ion-selective sensors. Zinc-targeting sensors that contain an anilino-based electron donor (aka, the PeT 'switch') have multiple advantages over those with an aliphatic amino switch. In addition to the lower pKa value of an aniline than that of a comparably substituted aliphatic amine, which reduces the interference of pH on the spectral properties of the attached fluorophore, the oxidation potentials of anilino groups are lower than those of aliphatic amino counterparts, which make them better electron donors in PeT...
October 20, 2017: Organic & Biomolecular Chemistry
https://www.readbyqxmd.com/read/29052356/in-vitro-biocompatibility-bioactivity-and-photoluminescence-properties-of-eu-3-sr-2-dual-doped-nano-hydroxyapatite-for-biomedical-applications
#5
Lakshmanaperumal Sundarabharathi, Hemalatha Parangusan, Deepalekshmi Ponnamma, Mariam Al Ali Al-Maadeed, Mahendran Chinnaswamy
In the present investigation, we have successfully synthesized luminescent Eu(3+) -doped and Eu(3+) /Sr(2+) codoped hydroxyapatite (HA) nanoparticles through sol-gel assisted precipitation method with the aim of developing novel biomaterials containing osteoblast mineral (Sr(2+) ) and luminescence activator (Eu(3+) ). The structure, morphology, thermal stability, and luminescence properties of the resultant spherical nanoparticles (50-100 nm diameters) were studied. Moreover, the in-vitro bioactivity of Eu0...
October 20, 2017: Journal of Biomedical Materials Research. Part B, Applied Biomaterials
https://www.readbyqxmd.com/read/29052214/quantitative-3d-analysis-of-nuclear-morphology-and-heterochromatin-organization-from-whole-mount-plant-tissue-using-nucleusj
#6
Sophie Desset, Axel Poulet, Christophe Tatout
Image analysis is a classical way to study nuclear organization. While nuclear organization used to be investigated by colorimetric or fluorescent labeling of DNA or specific nuclear compartments, new methods in microscopy imaging now enable qualitative and quantitative analyses of chromatin pattern, and nuclear size and shape. Several procedures have been developed to prepare samples in order to collect 3D images for the analysis of spatial chromatin organization, but only few preserve the positional information of the cell within its tissue context...
2018: Methods in Molecular Biology
https://www.readbyqxmd.com/read/29051930/a-two-photon-excitable-and-ratiometric-fluorogenic-nitric-oxide-photoreleaser-and-its-biological-applications
#7
Xilei Xie, Jilin Fan, Muwen Liang, Yong Li, Xiaoyun Jiao, Xu Wang, Bo Tang
We report for the first time the development of a two-photon excitable NO photoreleaser, CNNO, for ratiometric imaging and tracking of NO release in live cells. CNNO exhibits the merits of spatiotemporal control in both the site-specific NO release in the selected cell culture region and the controllable vasodilation of mouse aorta ex vivo.
October 20, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/29050826/live-cell-time-lapse-imaging-and-single-cell-tracking-of-in-vitro-cultured-neural-stem-cells-tools-for-analyzing-dynamics-of-cell-cycle-migration-and-lineage-selection
#8
Katja M Piltti, Brian J Cummings, Krystal Carta, Ayla Manughian-Peter, Colleen Worne, Kulbir Singh, Danier Ong, Yuriy Maksymyuk, Michelle Khine, Aileen J Anderson
Neural stem cell (NSC) cultures have been considered technically challenging for time-lapse analysis due to high motility, photosensitivity, and growth at confluent densities. We have tested feasibility of long-term live-cell time-lapse analysis for NSC migration and differentiation studies. Here, we describe a method to study the dynamics of cell cycle, migration, and lineage selection in cultured multipotent mouse or human NSCs using single-cell tracking during a long-term, 7-14 day live-cell time-lapse analysis...
October 16, 2017: Methods: a Companion to Methods in Enzymology
https://www.readbyqxmd.com/read/29049733/tunneling-nanotubes-are-novel-cellular-structures-that-communicate-signals-between-trabecular-meshwork-cells
#9
Kate E Keller, John M Bradley, Ying Ying Sun, Yong-Feng Yang, Ted S Acott
Purpose: The actin cytoskeleton of trabecular meshwork (TM) cells plays a role in regulating aqueous humor outflow. Many studies have investigated stress fibers, but F-actin also assembles into other supramolecular structures including filopodia. Recently, specialized filopodia called tunneling nanotubes (TNTs) have been described, which communicate molecular signals and organelles directly between cells. Here, we investigate TNT formation by TM cells. Methods: Human TM cells were labeled separately with the fluorescent dyes, DiO and DiD, or with mitochondrial dye...
October 1, 2017: Investigative Ophthalmology & Visual Science
https://www.readbyqxmd.com/read/29049361/methodological-aspects-of-mri-of-transplanted-superparamagnetic-iron-oxide-labeled-mesenchymal-stem-cells-in-live-rat-brain
#10
Daria Namestnikova, Ilya Gubskiy, Irina Kholodenko, Pavel Melnikov, Kirill Sukhinich, Anna Gabashvili, Daniil Vishnevskiy, Anastasia Soloveva, Maxim Abakumov, Igor Vakhrushev, Alexei Lupatov, Vladimir Chekhonin, Leonid Gubsky, Konstantin Yarygin
In vivo tracking of transplanted mesenchymal stem cells (MSCs) migration and homing is vital for understanding the mechanisms of beneficial effects of MSCs transplantation in animal models of diseases and in clinical trials. Transplanted cells can be labeled with superparamagnetic iron oxide (SPIO) particles and visualized in vivo using a number of iron sensitive MRI techniques. However, the applicability of those techniques for SPIO-labeled MSCs tracking in live brain has not been sufficiently investigated...
2017: PloS One
https://www.readbyqxmd.com/read/29048879/near-infrared-fluorescent-probe-with-remarkable-large-stokes-shift-and-favorable-water-solubility-for-real-time-tracking-leucine-aminopeptidase-in-living-cells-and-in-vivo
#11
Wenda Zhang, Feiyan Liu, Chao Zhang, Jian-Guang Luo, Jun Luo, Wenying Yu, Lingyi Kong
Leucine aminopeptidase (LAP) is a kind of proteolytic enzymes and associated closely with pathogenesis of cancer and liver injury. Accurate detection of LAP activity with high sensitivity and selectivity is imperative to detect its distribution and dynamic changes for understanding LAP's function and early diagnosing the disease states. However, fluorescent detection of LAP in living systems is challenging. To data, rarely fluorescent probes have been reported for imaging LAP in vivo. In this study, a novel probe (TMN-Leu) was developed by conjugating a near-infrared dicyanoisophorone derivative fluorophore with LAP activatable L-leucine amide moiety for the first time...
October 19, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/29047985/quantitative-phase-imaging-by-optimized-asymmetric-illumination
#12
Yoshimasa Suzuki, Mayumi Odaira, Hisashi Ohde, Yoshimasa Kawata
We have presented a simple approach for quantitative phase imaging by optimizing asymmetric illumination of a conventional microscope. With this illumination, the light intensity modulation accompanying refraction at the surface profile of phase objects occurs, and "phase-gradient information" can be derived by detecting it. Two images with phase-gradient information on different axes are converted into the two-dimensional phase distribution of the specimen by introducing the phase-gradient transfer function, which is the intensity change due to refraction by the phase-gradient of a specimen...
September 1, 2017: Applied Optics
https://www.readbyqxmd.com/read/29046869/staphylococcus-aureus-alpha-toxin-induces-the-formation-of-dynamic-tubules-labeled-with-lc3-within-host-cells-in-a-rab7-and-rab1b-dependent-manner
#13
María M López de Armentia, María C Gauron, María I Colombo
Staphylococcus aureus is a pathogen that causes severe infectious diseases that eventually lead to septic and toxic shock. S. aureus infection is characterized by the production of virulence factors, including enzymes and toxins. After internalization S. aureus resides in a phagosome labeled with Rab7 protein. Here, we show that S. aureus generates tubular structures marked with the small GTPases Rab1b and Rab7 and by the autophagic protein LC3 at early times post-infection. As shown by live cell imaging these tubular structures are highly dynamic, extend, branch and grow in length...
2017: Frontiers in Cellular and Infection Microbiology
https://www.readbyqxmd.com/read/29045826/a-cell-migration-tracking-tool-supports-coupling-of-tissue-rotation-to-elongation
#14
Dong-Yuan Chen, Justin Crest, David Bilder
Cell migration is indispensable to morphogenesis and homeostasis. Live imaging allows mechanistic insights, but long-term observation can alter normal biology, and tools to track movements in vivo without perturbation are lacking. We develop here a tool called M-TRAIL (matrix-labeling technique for real-time and inferred location), which reveals migration histories in fixed tissues. Using clones that overexpress GFP-tagged extracellular matrix (ECM) components, motility trajectories are mapped based on durable traces deposited onto basement membrane...
October 17, 2017: Cell Reports
https://www.readbyqxmd.com/read/29045395/single-molecule-imaging-reveals-receptor-g-protein-interactions-at-cell-surface-hot-spots
#15
Titiwat Sungkaworn, Marie-Lise Jobin, Krzysztof Burnecki, Aleksander Weron, Martin J Lohse, Davide Calebiro
G-protein-coupled receptors mediate the biological effects of many hormones and neurotransmitters and are important pharmacological targets. They transmit their signals to the cell interior by interacting with G proteins. However, it is unclear how receptors and G proteins meet, interact and couple. Here we analyse the concerted motion of G-protein-coupled receptors and G proteins on the plasma membrane and provide a quantitative model that reveals the key factors that underlie the high spatiotemporal complexity of their interactions...
October 18, 2017: Nature
https://www.readbyqxmd.com/read/29044909/recruitment-of-7sl-rna-to-assembling-hiv-1-virus-like-particles
#16
Michelle S Itano, Helene Arnion, Sandra L Wolin, Sanford M Simon
Retroviruses incorporate specific host cell RNAs into virions. In particular, the host noncoding 7SL RNA is highly abundant in all examined retroviruses compared to its cellular levels or relative to common mRNAs such as actin. Using live cell imaging techniques, we have determined that the 7SL RNA does not arrive with the HIV-1 RNA genome. Instead, it is recruited contemporaneous with assembly of the protein HIV-1 Gag at the plasma membrane. Further, we demonstrate that complexes of 7SL RNA and Gag can be immunoprecipitated from both cytosolic and plasma membrane fractions...
October 16, 2017: Traffic
https://www.readbyqxmd.com/read/29043787/rate-of-lipid-peroxyl-radical-production-during-cellular-homeostasis-unravelled-via-fluorescence-imaging
#17
Lana E Greene, Richard Lincoln, Gonzalo Cosa
Reactive oxygen species (ROS) and their associated byproducts have been traditionally associated with a range of pathologies. It is now believed however, that at basal levels, these molecules also play a beneficial cellular function in the form of cell signalling and redox regulation. Critical to elucidating their physiological role is the opportunity to visualize and quantify the production of ROS with spatiotemporal accuracy. Armed with a newly developed, extremely sensitive fluorogenic α-tocopherol analogue (H4BPMHC), we report herein the observation of steady concentrations of lipid peroxyl radicals produced in live cell imaging conditions...
October 18, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/29043684/imaging-the-er-and-endomembrane-system-in-cereal-endosperm
#18
Verena Ibl, Jenny Peters, Eva Stöger, Elsa Arcalís
The cereal endosperm is a complex structure comprising distinct cell types, characterized by specialized organelles for the accumulation of storage proteins. Protein trafficking in these cells is complicated by the presence of several different storage organelles including protein bodies (PBs) derived from the endoplasmic reticulum (ER) and dynamic protein storage vacuoles (PSVs). In addition, trafficking may follow a number of different routes depending on developmental stage, showing that the endomembrane system is capable of massive reorganization...
2018: Methods in Molecular Biology
https://www.readbyqxmd.com/read/29043668/preparation-and-imaging-of-specialized-er-using-super-resolution-and-tem-techniques
#19
Karen Bell, Karl Oparka, Kirsten Knox
The plant endoplasmic reticulum (ER) forms several specialized structures. These include the sieve element reticulum (SER) and the desmotubule formed as the ER passes through plasmodesmata. Imaging both of these structures has been inhibited by the resolution limits of light microscopy and their relatively inaccessible locations, combined with the fragile nature of the ER. Here we describe methods to view desmotubules in live cells under 3D-structured illumination microscopy (3D-SIM) and methods to fix and prepare phloem tissue for both 3D-SIM and transmission electron microscopy (TEM) which preserve the fragile structure and allow the detailed imaging of the SER...
2018: Methods in Molecular Biology
https://www.readbyqxmd.com/read/29043646/long-term-imaging-of-dna-damage-and-cell-cycle-progression-in-budding-yeast-using-spinning-disk-confocal-microscopy
#20
Riccardo Montecchi, Etienne Schwob
Live cell imaging can monitor biological processes in time and space by providing quantitative measurements of cell behavior on a single-cell basis and in live conditions. However the illumination required to visualize fluorescently tagged endogenous proteins often perturbs cellular physiology, a problem particularly acute for yeast cells that are small, highly photosensitive and with scarce protein content. Analyzing the activation of the DNA damage response (DDR) in various yeast mutants or growth conditions, as well as its consequences for cell cycle progression and cell viability over extended periods of time therefore requires a special microscopy setup that does not by itself create DNA damage or perturb cell growth...
2018: Methods in Molecular Biology
keyword
keyword
23355
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"