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https://www.readbyqxmd.com/read/28300393/remote-control-and-modulation-of-cellular-events-by-plasmonic-gold-nanoparticles-implications-and-opportunities-for-biomedical-applications
#1
Jiayang Li, Jing Liu, Chunying Chen
Compared to traditional hyperthermia methods, gold nanoparticles (Au NPs) successfully achieve site-specific incremental temperature in deep tissues. By virtue of near-infrared (NIR) laser-mediated photothermal treatment, Au NPs have been widely explored in clinical and preclinical applications, including cancer therapy and tissue engineering. In this issue of ACS Nano, Suzuki, Ciofani, and colleagues demonstrate how gold nanoshells can remotely activate striated muscle cells via inducing myotube contraction and modulating related gene expression by mild heat stimulation under NIR irradiation...
March 28, 2017: ACS Nano
https://www.readbyqxmd.com/read/28251053/laser-triggered-small-interfering-rna-releasing-gold-nanoshells-against-heat-shock-protein-for-sensitized-photothermal-therapy
#2
Zhaohui Wang, Siwen Li, Min Zhang, Yi Ma, Yuxi Liu, Weidong Gao, Jiaqi Zhang, Yueqing Gu
The resistance of cancer cells to photothermal therapy is closely related to the overexpression of heat shock proteins (HSPs), which are abnormally upregulated when cells are under lethal stresses. Common strategies that use small molecule inhibitors against HSPs to enhance hyperthermia effect lack spatial and temporal control of drug release, leading to unavoidable systemic toxicity. Herein, a versatile photothermal platform is developed which is composed of a hollow gold nanoshell core densely packed with small interfering RNAs against heat shock protein 70 (Hsp70)...
February 2017: Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
https://www.readbyqxmd.com/read/28245425/intra-arterial-delivery-of-superparamagnetic-iron-oxide-nanoshell-and-polyvinyl-alcohol-based-chemoembolization-system-for-the-treatment-of-liver-tumor
#3
Qi Liang, Yi-Xiang Wang, Jin-Song Ding, Wei He, Ling-Ling Deng, Na Li, Yun-Jie Liao, Zhen Li, Bin Ye, Wei Wang
A superparamagnetic iron oxide (SPIO) nanoshell and polyvinyl alcohol (PVA) based chemoembolization system for anti-cancer drug doxorubicin (DOX) delivery has previously been presented. We have also previously confirmed the feasibility and safety of this multifunctional system for carrying both DOX and SPIO nanoparticles in vitro. However, the pharmacokinetic and the therapeutic efficacy of this novel drug-delivery system in vivo is not yet clear, and as such was the subject of this study. A rabbit liver tumor model was utilized, whereby the tumors were targeted by SPIO/DOX/PVA composite infused via a catheter into the hepatic arteries which supplying blood to the tumor...
January 2017: Discovery Medicine
https://www.readbyqxmd.com/read/28244304/synthesis-of-ultrasmall-platinum-nanoparticles-on-polymer-nanoshells-for-size-dependent-catalytic-oxidation-reactions
#4
Licheng Bai, Shumeng Zhang, Qiang Chen, Chuanbo Gao
It is highly desirable for the synthesis and stabilization of noble metal nanoparticles of uniform, precisely tunable sizes, especially in the range of angstroms to a few nanometers, for many catalytic applications in pursuit of optimal activity and selectivity. Herein, we report a novel strategy for the synthesis of uniform platinum (Pt) nanoparticles of ultrasmall sizes (average size: 0.9-2.3 nm), which are stabilized on hollow polymer nanoshells formed by polymerization of sodium dodecyl benzenesulfonate (SDBS) at the interface of an ethanol/water emulsion...
March 22, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28221348/self-assembly-of-nanoparticles-into-biomimetic-capsid-like-nanoshells
#5
Ming Yang, Henry Chan, Gongpu Zhao, Joong Hwan Bahng, Peijun Zhang, Petr Král, Nicholas A Kotov
Nanoscale compartments are one of the foundational elements of living systems. Capsids, carboxysomes, exosomes, vacuoles and other nanoshells easily self-assemble from biomolecules such as lipids or proteins, but not from inorganic nanomaterials because of difficulties with the replication of spherical tiling. Here we show that stabilizer-free polydispersed inorganic nanoparticles (NPs) can spontaneously organize into porous nanoshells. The association of water-soluble CdS NPs into self-limited spherical capsules is the result of scale-modified electrostatic, dispersion and other colloidal forces...
March 2017: Nature Chemistry
https://www.readbyqxmd.com/read/28217783/controlled-formation-of-uniform-nanoshells-of-manganese-oxide-and-their-potential-in-lithium-ion-batteries
#6
Xiao-Chan Liu, Jun-Yu Piao, De-Shan Bin, Tian-Qi Zhang, Shu-Yi Duan, Zi-Xiao Wu, An-Min Cao, Li-Jun Wan
Uniform nanoshells of manganese oxides have been successfully prepared by controlling their growth kinetics in solution. The prepared manganese oxides show promising electrochemical performance when used as an anode material in lithium ion batteries.
February 20, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28198628/protection-of-photosynthetic-algae-against-ultraviolet-radiation-by-one-step-ceo2-shellization
#7
Pengqiang Duan, Tingting Huang, Wei Xiong, Lei Shu, Yuling Yang, Changyu Shao, Xurong Xu, Weimin Ma, Ruikang Tang
Photosynthetic microalgae play an important role in solar-to-chemical energy conversion on Earth, but the increasing solar ultraviolet (UV) radiation seriously reduces the biological photosynthesis. Here, we developed a one-step approach to construct cell-in-shell hybrid structure by using direct adsorption of CeO2 nanoparticles onto cells. The engineered CeO2 nanoshell can efficiently protect the enclosed Chlorella cell due to its excellent UV filter property, which can also eliminate UV-induced oxidative stress...
February 22, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28197024/nanotechnology-in-urology
#8
REVIEW
Sudhindra Jayasimha
INTRODUCTION: Nanotechnology has revolutionized our approach to medical diagnostics as well as therapeutics and has spanned an entirely new branch of research. This review addresses the potential applications of Nanotechnology in Urology. This article is based on the Dr. Sitharaman Best Essay award of the Urological Society of India for 2016. METHODS: A PubMed search was performed for all relevant articles using the terms, "nanotechnology, nanoparticles, nanoshells, nanoscaffolds, and nanofibers...
January 2017: Indian Journal of Urology: IJU: Journal of the Urological Society of India
https://www.readbyqxmd.com/read/28193331/colorimetric-enumeration-of-bacterial-contamination-in-water-based-on-%C3%AE-galactosidase-gold-nanoshell-activity
#9
Fouzia Tanvir, Atif Yaqub, Shazia Tanvir, William A Anderson
In this study we report a method for the rapid and sensitive estimation of bacterial cell concentration in solution based on a colorimetric enzyme/gold nanoshells conjugate system. The CTAB capped gold nanoshells are electrostatically attracted by both the bacterial surface and the enzyme β-galactosidase. The preferential binding of cationic (CTAB)-functionalized gold nanoshells to the more negative bacterial surfaces leaves active β-galactosidase in solution, providing an enzyme-amplified colorimetric response of the binding event...
April 2017: Enzyme and Microbial Technology
https://www.readbyqxmd.com/read/28150199/fabrication-of-photothermal-stable-gold-nanosphere-mesoporous-silica-hybrid-nanoparticle-responsive-to-near-infrared-light
#10
Bei Cheng, Peisheng Xu
Various gold nanoparticles have been explored in biomedical systems and proven to be promising in photothermal therapy and drug delivery. Among them, nanoshells were regarded as traditionally strong near infrared absorbers that have been widely used to generate photothermal effect for cancer therapy. However, the nanoshell is not photo-thermal stable and thus is not suitable for repeated irradiation. Here, we describe a novel discrete gold nanostructure by mimicking the continuous gold nanoshell-gold/mesoporous silica hybrid nanoparticle (GoMe)...
2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/28150198/multifunctionalization-of-gold-nanoshells
#11
Sandra W Bishnoi, Yujen Lin
Gold silica nanoshells have found many applications within the field of molecular biology, including as nanoscale sensors, the detection of biomarkers, and in the treatment of solid tumors using photothermal ablation. In order for them to be targeted to specific biomarkers while also remaining stable in biological media, it is often necessary to modify their surfaces with more than one functional group. Here, we describe how to create multifunctional gold nanoshells that can be used to either target specific tumor types in vivo or for the detection of biomarkers using biological specimen...
2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/28107625/gold-nanoshell-mediated-remote-myotube-activation
#12
Attilio Marino, Satoshi Arai, Yanyan Hou, Andrea Degl'Innocenti, Valentina Cappello, Barbara Mazzolai, Young-Tae Chang, Virgilio Mattoli, Madoka Suzuki, Gianni Ciofani
Mild heat stimulation of muscle cells within the physiological range represents an intriguing approach for the modulation of their functions. In this work, photothermal conversion was exploited to remotely stimulate striated muscle cells by using gold nanoshells (NSs) in combination with near-infrared (NIR) radiation. Temperature increments of approximately 5 °C were recorded by using an intracellular fluorescent molecular thermometer and were demonstrated to efficiently induce myotube contraction. The mechanism at the base of this phenomenon was thoroughly investigated and was observed to be a Ca(2+)-independent event directly involving actin-myosin interactions...
March 28, 2017: ACS Nano
https://www.readbyqxmd.com/read/28102962/general-synthesis-of-multishell-mixed-metal-oxyphosphide-particles-with-enhanced-electrocatalytic-activity-in-the-oxygen-evolution-reaction
#13
Bu Yuan Guan, Le Yu, Xiong Wen David Lou
We report a general approach for the synthesis of multishell mixed-metal oxyphosphide particles. Seven-layer Mn-Co oxide particles were first prepared by thermal treatment of Mn-Co coordination polymer precursors. Afterwards, these multishell Mn-Co oxide particles were further transformed into multishell Mn-Co oxyphosphide particles through a phosphidation reaction. This approach is very versatile and can be applied to synthesize other multishell mixed-metal oxyphosphide particles with different compositions...
January 19, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28101415/endoscopic-sensing-of-alveolar-ph
#14
D Choudhury, M G Tanner, S McAughtrie, F Yu, B Mills, T R Choudhary, S Seth, T H Craven, J M Stone, I K Mati, C J Campbell, M Bradley, C K I Williams, K Dhaliwal, T A Birks, R R Thomson
Previously unobtainable measurements of alveolar pH were obtained using an endoscope-deployable optrode. The pH sensing was achieved using functionalized gold nanoshell sensors and surface enhanced Raman spectroscopy (SERS). The optrode consisted of an asymmetric dual-core optical fiber designed for spatially separating the optical pump delivery and signal collection, in order to circumvent the unwanted Raman signal generated within the fiber. Using this approach, we demonstrate a ~100-fold increase in SERS signal-to-fiber background ratio, and demonstrate multiple site pH sensing with a measurement accuracy of ± 0...
January 1, 2017: Biomedical Optics Express
https://www.readbyqxmd.com/read/28094402/mesoporous-carbon-nanoshells-for-high-hydrophobic-drug-loading-multimodal-optical-imaging-controlled-drug-release-and-synergistic-therapy
#15
Hui Wang, Kui Wang, Qingxin Mu, Zachary R Stephen, Yanyan Yu, Shuiqin Zhou, Miqin Zhang
Loading and controlled release of sufficient hydrophobic drugs to tumor cells has been the bottleneck in chemotherapy for decades. Herein we report the development of a fluorescent and mesoporous carbon nanoshell (FMP-CNS) that exhibits a loading capacity for the hydrophobic drug paclitaxel (PTX) as high as ∼80 wt% and releases the drug in a controllable fashion under NIR irradiation (825 nm) at an intensity of 1.5 W cm(-2). The high drug loading is primarily attributed to its mesoporous structure and to the supramolecular π-stacking between FMP-CNSs and PTX molecules...
January 26, 2017: Nanoscale
https://www.readbyqxmd.com/read/28086858/the-influence-of-adding-modified-zirconium-oxide-titanium-dioxide-nano-particles-on-mechanical-properties-of-orthodontic-adhesive-an-in-vitro-study
#16
Nayef H Felemban, Mohamed I Ebrahim
BACKGROUND: The purpose of this in-vitro study was to examine the effect of incorporating different concentrations of Zirconium oxide-Titanium dioxide (ZrO2-TiO2) nanoparticles, which can have antibacterial properties, on the mechanical properties of an orthodontic adhesive. METHODS: ZrO2-TiO2 (Zirconium oxide, HWNANO, Hongwu International Group Ltd, China) -Titanium dioxide, Nanoshell, USA) nanopowder were incorporated into orthodontic adhesive (Transbond XT, 3 M Unitek, Monrovia, USA) with different concentrations (0...
January 13, 2017: BMC Oral Health
https://www.readbyqxmd.com/read/28074853/plasmonic-plano-semi-cylindrical-nanocavities-with-high-efficiency-local-field-confinement
#17
Feifei Liu, Xinping Zhang, Xiaohui Fang
Plasmonic nanocavity arrays were achieved by producing isolated silver semi-cylindrical nanoshells periodically on a continuous planar gold film. Hybridization between localized surface plasmon resonance (LSPR) in the Ag semi-cylindrical nanoshells (SCNS) and surface plasmon polaritons (SPP) in the gold film was observed as split bonding and anti-bonding resonance modes located at different spectral positions. This led to strong local field enhancement and confinement in the plano-concave nanocavites. Narrow-band optical extinction with an amplitude as high as 1...
January 11, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28071899/near-ir-absorbing-gold-nanoframes-with-enhanced-physiological-stability-and-improved-biocompatibility-for-in-vivo-biomedical-applications
#18
Liying Wang, Yunching Chen, Hsin Yao Lin, Yung-Te Hou, Ling-Chu Yang, Aileen Y Sun, Jia-Yu Liu, Chien-Wen Chang, Dehui Wan
This paper describes the synthesis of near-infrared (NIR)-absorbing gold nanoframes (GNFs) and a systematic study comparing their physiological stability and biocompatibility with those of hollow Au-Ag nanoshells (GNSs), which have been used widely as photothermal agents in biomedical applications because of their localized surface plasmon resonance (LSPR) in the NIR region. The GNFs were synthesized in three steps: galvanic replacement, Au deposition, and Ag dealloying, using silver nanospheres (SNP) as the starting material...
February 1, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28058650/near-and-far-field-optical-response-of-eccentric-nanoshells
#19
Ovidio Peña-Rodríguez, Pablo Díaz-Núñez, Vladimir Rodríguez-Iglesias, Luis Montaño-Priede, Antonio Rivera, Umapada Pal
We study the optical response of eccentric nanoshells (i.e., spherical nanoparticles with an eccentric spherical inclusion) in the near and the far field through finite-difference time-domain simulations. Plasmon hybridization theory is used to explain the obtained results. The eccentricity generates a far-field optical spectrum with various plasmon peaks. The number, position, and width of the peaks depend on the core offset. Near-field enhancements in the surroundings of these structures are significantly larger than those obtained for equivalent concentric nanoshells and, more importantly, they are almost independent of the illumination conditions...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28048306/we-fg-bra-04-a-portable-confocal-microscope-to-image-live-cell-damage-response-induced-by-therapeutic-radiation
#20
C McFadden, D Flint, D Sadetaporn, A Asaithamby, D Grosshans, G Sawakuchi
PURPOSE: To construct a custom and portable fluorescence confocal laser-scanning microscope (FCLSM) that can be placed in the path of therapeutic radiation beams to study real-time radiation-induced damage response in live cells. METHODS: We designed and constructed a portable FCLSM with three laser diodes for excitation (405, 488, and 635 nm). An objective lens focuses the excitation light and collects fluorescence from the sample. A pair of galvanometer mirrors scans/collects the laser beam/fluorescence along the focal plane (x/y-directions)...
June 2016: Medical Physics
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