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https://www.readbyqxmd.com/read/29353439/transgenesis-by-microparticle-bombardment-for-live-imaging-of-fluorescent-proteins-in-pristionchus-pacificus-germline-and-early-embryos
#1
Satoshi Namai, Asako Sugimoto
Pristionchus pacificus is a free-living nematode used as a model organism for evolutionary developmental and ecological biology. Although a transgenic technique to form complex arrays by microinjection has been established in P. pacificus, transgene expression from the array in the germline and early embryos tends to be silenced. Here, we established a method to integrate transgenes into the genome of P. pacificus using microparticle bombardment with hygromycin B selection. Additionally, we isolated a mutant exhibiting significantly lower autofluorescence in the germline and early embryos, facilitating visualization of transgene-derived fluorescent proteins for live imaging...
January 20, 2018: Development Genes and Evolution
https://www.readbyqxmd.com/read/29353086/ruthenium-dendrimers-as-carriers-for-anticancer-sirna
#2
Sylwia Michlewska, Maksim Ionov, Marta Maroto-Díaz, Aleksandra Szwed, Aliaksei Ihnatsyeu-Kachan, Svetlana Loznikova, Dzmitry Shcharbin, Marek Maly, Rafael Gomez Ramirez, Francisco Javier de la Mata, Maria Bryszewska
Dendrimers, which are considered as one of the most promising tools in the field of nanobiotechnology due to their structural organization, showed a great potential in gene therapy, drug delivery, medical imaging and as antimicrobial and antiviral agents. This article is devoted to study interactions between new carbosilane-based metallodendrimers containing ruthenium and anti-cancer small interfering RNA (siRNA). Formation of complexes between anti-cancer siRNAs and Ru-based carbosilane dendrimers was evaluated by transmission electron microscopy, circular dichroism and fluorescence...
January 12, 2018: Journal of Inorganic Biochemistry
https://www.readbyqxmd.com/read/29352940/pegylated-chitosan-nanoparticles-with-embedded-bismuth-sulfide-for-dual-wavelength-fluorescent-imaging-and-photothermal-therapy
#3
Ke Wang, Jialang Zhuang, Yubing Liu, Maosheng Xu, Jingyuan Zhuang, Zuanguang Chen, Yen Wei, Yuanqing Zhang
It is of great significance to construct multifunctional nanosystems for simultaneous imaging and therapy of cancer cells. Herein, PEGylated chitosan nanoparticles with embedded bismuth sulfide were facilely fabricated via reverse-microemulsion method for fluorescent imaging and photothermal therapy of HepG2 cells. The obtained BSA-Bi2S3-CG-PEG nanospheres revealed dual-wavelength fluorescence, which were spectrally isolated from the bioautofluorescence. Moreover, they demonstrated remarkable photothermal conversion efficiency and stability...
March 15, 2018: Carbohydrate Polymers
https://www.readbyqxmd.com/read/29352920/biomass-based-magnetic-fluorescent-nanoparticles-one-step-scalable-synthesis-application-as-drug-carriers-and-mechanism-study
#4
Lei Li, Feijun Wang, Ziqiang Shao
A biomass-based magnetic fluorescent nanoparticle (MFNPs) was successively in situ synthesized via a one-step high-gravity approach, which constructed by a magnetic core of Fe3O4 nanoparticles, the fluorescent marker of carbon dots (CDs), and shells of chitosan (CS). The obtained MFNPs had a 10 nm average diameter and narrow particle size distribution, low cytotoxicity, superior fluorescent emission and superparamagnetic properties. The encapsulating and release 5-fluorouracil experiments confirmed that the introduction of CS/CDs effectively improved the drug loading capacity...
March 15, 2018: Carbohydrate Polymers
https://www.readbyqxmd.com/read/29352284/sensitive-detection-of-fluorescence-in-western-blotting-by-merging-images
#5
Yukari Kondo, Shinichiro Higa, Takeshi Iwasaki, Tomoya Matsumoto, Kazumitsu Maehara, Akihito Harada, Yoshihiro Baba, Masatoshi Fujita, Yasuyuki Ohkawa
The western blotting technique is widely used to analyze protein expression levels and protein molecular weight. The chemiluminescence method is mainly used for detection due to its high sensitivity and ease of manipulation, but it is unsuitable for detailed analyses because it cannot be used to detect multiple proteins simultaneously. Recently, more attention has been paid to the fluorescence detection method because it is more quantitative and is suitable for the detection of multiple proteins simultaneously...
2018: PloS One
https://www.readbyqxmd.com/read/29352112/direct-cell-cell-contact-between-mature-osteoblasts-and-osteoclasts-dynamically-controls-their-functions-in-vivo
#6
Masayuki Furuya, Junichi Kikuta, Sayumi Fujimori, Shigeto Seno, Hiroki Maeda, Mai Shirazaki, Maki Uenaka, Hiroki Mizuno, Yoriko Iwamoto, Akito Morimoto, Kunihiko Hashimoto, Takeshi Ito, Yukihiro Isogai, Masafumi Kashii, Takashi Kaito, Shinsuke Ohba, Ung-Il Chung, Alexander C Lichtler, Kazuya Kikuchi, Hideo Matsuda, Hideki Yoshikawa, Masaru Ishii
Bone homeostasis is regulated by communication between bone-forming mature osteoblasts (mOBs) and bone-resorptive mature osteoclasts (mOCs). However, the spatial-temporal relationship and mode of interaction in vivo remain elusive. Here we show, by using an intravital imaging technique, that mOB and mOC functions are regulated via direct cell-cell contact between these cell types. The mOBs and mOCs mainly occupy discrete territories in the steady state, although direct cell-cell contact is detected in spatiotemporally limited areas...
January 19, 2018: Nature Communications
https://www.readbyqxmd.com/read/29351997/spatiotemporal-organization-of-exocytosis-emerges-during-neuronal-shape-change
#7
Fabio L Urbina, Shawn M Gomez, Stephanie L Gupton
Neurite elongation and branching in developing neurons requires plasmalemma expansion, hypothesized to occur primarily via exocytosis. We posited that exocytosis in developing neurons and nonneuronal cells would exhibit distinct spatiotemporal organization. We exploited total internal reflection fluorescence microscopy to image vesicle-associated membrane protein (VAMP)-pHluorin-mediated exocytosis in mouse embryonic cortical neurons and interphase melanoma cells, and developed computer-vision software and statistical tools to uncover spatiotemporal aspects of exocytosis...
January 19, 2018: Journal of Cell Biology
https://www.readbyqxmd.com/read/29351850/systematic-gene-to-phenotype-arrays-a-high-throughput-technique-for-molecular-phenotyping
#8
Philipp A Jaeger, Lilia Ornelas, Cameron McElfresh, Lily R Wong, Randolph Y Hampton, Trey Ideker
We have developed a highly parallel strategy, systematic gene-to-phenotype arrays (SGPAs), to comprehensively map the genetic landscape driving molecular phenotypes of interest. By this approach, a complete yeast genetic mutant array is crossed with fluorescent reporters and imaged on membranes at high density and contrast. Importantly, SGPA enables quantification of phenotypes that are not readily detectable in ordinary genetic analysis of cell fitness. We benchmark SGPA by examining two fundamental biological phenotypes: first, we explore glucose repression, in which SGPA identifies a requirement for the Mediator complex and a role for the CDK8/kinase module in regulating transcription...
January 18, 2018: Molecular Cell
https://www.readbyqxmd.com/read/29351414/the-murine-choroid-plexus-epithelium-expresses-the-2cl-h-exchanger-clc-7-and-na-h-exchanger-nhe6-in-the-luminal-membrane-domain
#9
Helle H Damkier, Henriette L Christensen, Inga B Christensen, Qi Wu, Robert A Fenton, Jeppe Praetorius
The choroid plexus epithelium within the brain ventricles secretes the majority of the cerebrospinal fluid (CSF). The luminal Na+,K+-ATPase acts in concert with a host of other transport proteins to mediate efficient fluid secretion across the epithelium. The CSF contains little protein buffer, but the pH value seems nonetheless maintained within narrow limits, even when faced with acid/base challenges. The involvement of choroid plexus acid/base transporters in CSF pH regulation is highlighted by the expression of several acid/base transporters in the epithelium...
December 20, 2017: American Journal of Physiology. Cell Physiology
https://www.readbyqxmd.com/read/29351321/methylglyoxal-produces-more-changes-in-biochemical-and-biophysical-properties-of-human-igg-under-high-glucose-compared-to-normal-glucose-level
#10
Mohd Adnan Khan, Zarina Arif, Mohd Asad Khan, Moinuddin, Khursheed Alam
Hyperglycaemia triggers increased production of methylglyoxal which can cause gross modification in proteins' structure vis-a-vis function though advanced glycation end products (AGEs). The AGEs may initiate vascular and nonvascular pathologies. In this study, we have examined the biochemical and biophysical changes in human IgG under normal and high glucose after introducing methylglyoxal into the assay mixture. This non-enzymatic reaction mainly engaged lysine residues as indicated by TNBS results. The UV results showed hyperchromicity in modified-IgG samples while fluorescence data supported AGEs formation during the course of reaction...
2018: PloS One
https://www.readbyqxmd.com/read/29350909/dual-drug-delivery-system-based-on-biodegradable-organosilica-core-shell-architectures
#11
Jiang-Lan Li, Ying-Jia Cheng, Chi Zhang, Han Cheng, Jun Feng, Ren-Xi Zhuo, Xuan Zeng, Xian-Zheng Zhang
To overcome drug resistance, efficient cancer therapeutic strategies using combination of small-molecule drugs and macromolecule drugs are highly desired. However, due to their significant differences in molecular weight and size, it is difficult to load them simultaneously in one vector and to release them individually. Here, a biodegradable organosilica based core/shell-structured nanocapsule was designed and used as a dual stimuli-responsive drug vector to solve this problem. Biodegradable organosilica shell coated outside the macromolecule model drug "core" would be disrupted by high glutathione (GSH) levels inside tumor cells, resulting in the escape of the entrapped drugs...
January 19, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29350900/fluorescent-tpa-gqds-probe-for-sensitive-assay-and-quantitative-imaging-of-hydroxyl-radical-in-living-cells
#12
Xin Hai, Zhiyong Guo, Xin Lin, Xuwei Chen, Jian-Hua Wang
A fluorescent probe TPA@GQDs is fabricated by the conjugation of terephthalic acid (TPA) on the surface of graphene quantum dots (GQDs). The TPA@GQDs probe not only owns favorable dispersibility, but also exhibits excellent fluorescence stability over wide pH range and high ionic strength, and favorable anti-photobleaching ability. The great fluorescence enhancement of TPA@GQDs induced by the reaction between TPA and hydroxyl radical makes the TPA@GQDs a powerful probe for the sensitive assay of hydroxyl radical, giving rise to a detection limit low down to 12 nmol L-1...
January 19, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29350743/facile-preparation-of-carbon-dot-supported-nanoflowers-for-efficient-photothermal-therapy-of-cancer-cells
#13
Changshun Hou, Shiqing Chen, Mengqi Wang
Herein, novel self-assembled red-emissive C-dots@Au nanoflowers were developed, and they demonstrated efficient photothermal properties under 750 nm laser irradiation. Moreover, C-dots@Au nanoflowers showed the ability of simultaneous photoacoustic and fluorescence imaging. Our study may provide a novel strategy for the efficient phototherapy of cancer cells based on C-dots.
January 19, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/29350608/acute-transverse-myelitis-following-scrub-typhus-a-case-report-and-review-of-the-literature
#14
Hyun-Seung Ryu, Bong Ju Moon, Jae-Young Park, Sang-Deok Kim, Seung-Kwon Seo, Jung-Kil Lee
Context Scrub typhus is an acute febrile disease caused by Orientia tsutsugamushi. The disease can usually involve the lungs, heart, liver, spleen and brain through hematogenous dissemination. However, very rarely, acute transverse myelitis in the spinal cord develops from scrub typhus. We present a case of acute transverse myelitis following scrub typhus with a review of the literature. Findings A 66-year-old male visited a hospital for general myalgia, mild headache, and fever in October. He was noted to have thick, black papule skin on his abdomen, which was highly suggestive of scrub typhus...
January 19, 2018: Journal of Spinal Cord Medicine
https://www.readbyqxmd.com/read/29350498/glioma-targeted-delivery-of-a-theranostic-liposome-integrated-with-quantum-dots-superparamagnetic-iron-oxide-and-cilengitide-for-dual-imaging-guiding-cancer-surgery
#15
He-Lin Xu, Jing-Jing Yang, De-Li ZhuGe, Meng-Ting Lin, Qun-Yan Zhu, Bing-Hui Jin, Meng-Qi Tong, Bi-Xin Shen, Jian Xiao, Ying-Zheng Zhao
Herein, a theranostic liposome (QSC-Lip) integrated with superparamagnetic iron oxide nanoparticles (SPIONs) and quantum dots (QDs) and cilengitide (CGT) into one platform is constructed to target glioma under magnetic targeting (MT) for guiding surgical resection of glioma. Transmission electron microscopy and X-ray photoelectron spectroscopy confirm the complete coencapsulation of SPIONs and QDs in liposome. Besides, CGT is also effectively encapsulated into the liposome with an encapsulation efficiency of ∼88...
January 19, 2018: Advanced Healthcare Materials
https://www.readbyqxmd.com/read/29350433/amino-group-of-salicylic-acid-exhibits-enhanced-inhibitory-potential-against-insulin-amyloid-fibrillation-with-protective-aptitude-toward-amyloid-induced-cytotoxicity
#16
Masihuz Zaman, Mohsin Vahid Khan, Syed Mohammad Zakariya, Saima Nusrat, Syed Mustapha Meeran, Parvez Alam, Mohammad Rehan Ajmal, Wahiduzzaman Wahiduzzaman, Yasser E Shahein, Amira M Abouelella, Rizwan Hasan Khan
Protein misfolding and aggregation lead to amyloid generation that in turn may induce cell membrane disruption and leads to cell apoptosis. In an effort to prevent or treat amyloidogenesis, large number of studies has been paying attention on breakthrough of amyloid inhibitors. In the present work, we aim to access the effect of two drugs, that is, acetylsalicylic acid and 5-amino salicylic acid on insulin amyloids by using various biophysical, imaging, cell viability assay, and computational approaches. We established that both drugs reduce the turbidity, light scattering and fluorescence intensity of amyloid indicator dye thioflavin T...
December 11, 2017: Journal of Cellular Biochemistry
https://www.readbyqxmd.com/read/29348621/dynamic-cellular-maps-of-molecular-species-application-to-drug-target-interactions
#17
Carolina García, Alejandro Losada, Miguel A Sacristán, Juan Fernando Martínez-Leal, Carlos M Galmarini, M Pilar Lillo
The design of living cell studies aimed at deciphering the mechanism of action of drugs targeting proteins with multiple functions, expressed in a wide range of concentrations and cellular locations, is a real challenge. We recently showed that the antitumor drug plitidepsin (APL) localizes sufficiently close to the elongation factor eEF1A2 so as to suggest the formation of drug-protein complexes in living cells. Here we present an extension of our previous micro-spectroscopy study, that combines Generalized Polarization (GP) images, with the phasor approach and fluorescence lifetime imaging microscopy (FLIM), using a 7-aminocoumarin drug analog (APL*) as fluorescence tracer...
January 18, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29348616/fast-and-effective-mitochondrial-delivery-of-%C3%AF-rhodamine-b-polysulfobetaine-peg-copolymers
#18
Nobuyuki Morimoto, Riho Takei, Masaru Wakamura, Yoshifumi Oishi, Masafumi Nakayama, Makoto Suzuki, Masaya Yamamoto, Françoise M Winnik
Mitochondrial targeting and entry, two crucial steps in fighting severe diseases resulting from mitochondria dysfunction, pose important challenges in current nanomedicine. Cell-penetrating peptides or targeting groups, such as Rhodamine-B (Rho), are known to localize in mitochondria, but little is known on how to enhance their effectiveness through structural properties of polymeric carriers. To address this issue, we prepared 8 copolymers of 3-dimethyl(methacryloyloxyethyl)ammonium propane sulfonate and poly(ethyleneglycol) methacrylate, p(DMAPS-ran-PEGMA) (molecular weight, 18...
January 18, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29348575/quantitative-optical-nanophysiology-of-ca2-signaling-at-inner-hair-cell-active-zones
#19
Jakob Neef, Nicolai T Urban, Tzu-Lun Ohn, Thomas Frank, Philippe Jean, Stefan W Hell, Katrin I Willig, Tobias Moser
Ca2+ influx triggers the release of synaptic vesicles at the presynaptic active zone (AZ). A quantitative characterization of presynaptic Ca2+ signaling is critical for understanding synaptic transmission. However, this has remained challenging to establish at the required resolution. Here, we employ confocal and stimulated emission depletion (STED) microscopy to quantify the number (20-330) and arrangement (mostly linear 70 nm × 100-600 nm clusters) of Ca2+ channels at AZs of mouse cochlear inner hair cells (IHCs)...
January 18, 2018: Nature Communications
https://www.readbyqxmd.com/read/29348493/dna-multi-bit-non-volatile-memory-and-bit-shifting-operations-using-addressable-electrode-arrays-and-electric-field-induced-hybridization
#20
Youngjun Song, Sejung Kim, Michael J Heller, Xiaohua Huang
DNA has been employed to either store digital information or to perform parallel molecular computing. Relatively unexplored is the ability to combine DNA-based memory and logical operations in a single platform. Here, we show a DNA tri-level cell non-volatile memory system capable of parallel random-access writing of memory and bit shifting operations. A microchip with an array of individually addressable electrodes was employed to enable random access of the memory cells using electric fields. Three segments on a DNA template molecule were used to encode three data bits...
January 18, 2018: Nature Communications
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