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https://www.readbyqxmd.com/read/28635380/inorganic-nanoparticles-as-potential-regulators-of-immune-response-in-dendritic-cells
#1
Silvia Fogli, Costanza Montis, Sara Paccosi, Angela Silvano, Elena Michelucci, Debora Berti, Alberto Bosi, Astrid Parenti, Paolo Romagnoli
AIM: The spontaneous adsorption of proteins on nanoparticles (NPs) in biological media is exploited to prepare complexes of NPs and proteins from cancer cells' lysates for application in cancer immunotherapy. MATERIALS & METHODS: Gold (Au) and silica NPs were synthesized, incubated with cancer cells' lysates and characterized. Dendritic cells (DCs) were challenged with protein-coated NPs, their maturation, viability and morphology were evaluated and lymphocytes T proliferation was determined...
June 21, 2017: Nanomedicine
https://www.readbyqxmd.com/read/28635372/peptide-functionalized-nanoparticles-for-the-selective-induction-of-apoptosis-in-target-cells
#2
Nicole Remaliah S Sibuyi, Ntevheleni Thovhogi, Kwazikwakhe B Gabuza, Miche D Meyer, Mustafa Drah, Martin O Onani, Amanda Skepu, Abram M Madiehe, Mervin Meyer
AIM: The study developed a prohibitin (PHB) targeted nanotherapy for selective induction of apoptosis in target cells. METHODS: Gold nanoparticles (AuNPs) were bifunctionalized with adipose homing and proapoptotic peptides. The efficacy and mode of cell death induced by the AuNPs were investigated in vitro on three cancer cell lines. RESULTS: The antiproliferative activity of PHB-targeted bifunctionalized AuNPs was more pronounced on cells that express the PHB receptor, and demonstrated receptor-mediated targeting and selectivity...
June 21, 2017: Nanomedicine
https://www.readbyqxmd.com/read/28632911/polymer-functionalized-gold-nanoparticles-as-non-viral-gene-delivery-reagents
#3
M Mar Encabo-Berzosa, Maria Sancho-Albero, Victor Sebastian, Silvia Irusta, Manuel Arruebo, Jesus Santamaria, Pilar Martín Duque
BACKGROUND: In this study we investigated the ability of PEG functionalized gold nanoparticles as non-viral vectors in the transfection of different cell lines, comparing them with commercial lipoplexes. METHODS: Positively charged gold nanoparticles were synthesized using PEI as reducing and stabilizer agent and its cytotoxicity reduced by its functionalization with PEG. We bound the nanoparticles to three plasmids with different sizes (4-40 kpb). The vector internalization was evaluated by confocal and electronic microscopy...
June 20, 2017: Journal of Gene Medicine
https://www.readbyqxmd.com/read/28632379/an-intracellular-delivery-platform-for-recalcitrant-cells-when-polymeric-carrier-marries-photoporation
#4
Jingxian Wu, Hui Xue, Zhonglin Lyu, Zhenhua Li, Yangcui Qu, Yajun Xu, Lei Wang, Qian Yu, Hong Chen
The intracellular delivery of exogenous macromolecules is of great interest for both fundamental biological research and clinical applications. Although traditional delivery systems based on either carrier mediation or membrane disruption have some advantages, however, they are generally limited with respect to delivery efficiency and cytotoxicity. Herein, a collaborative intracellular delivery platform with excellent comprehensive performance is developed using polyethylenimine of low molecular weight (LPEI) as a gene carrier in conjunction with a gold nanoparticle layer (GNPL) acting as a photoporation agent...
June 20, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28632139/peptide-functionalized-gold-nanoparticles-the-influence-of-ph-on-binding-efficiency
#5
Emma Harrison, Jeremy Hamilton, Manuel Montero, Dorian Dixon
We report herein on the synthesis of mixed monolayer gold nanoparticles (AuNPs) capped with both polyethylene glycol (PEG) and one of three peptides. Either a receptor-mediated endocytosis (RME) peptide, an endosomal escape pathway (H5WYG) peptide or the Nrp-1 targeting RGD peptide (CRGDK) labelled with FITC. All three peptides have a thiol containing cysteine residue which can be used to bind the peptides to the AuNPs. In order to investigate the influence of pH on peptide attachment, PEGylated AuNPs were centrifuged, the supernatant removed, and the nanoparticles were then re-suspended in a range of pH buffer solutions above, below and at the respective isoelectric points of the peptides before co-functionalization...
June 20, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28631828/development-of-a-colloidal-gold-immunochromatographic-assay-gica-for-the-rapid-detection-of-spiroplasma-eriocheiris-in-commercially-exploited-crustaceans-from-china
#6
H Liu, Y Xiu, Y Xu, M Tang, S Li, W Gu, Q Meng, W Wang
Spiroplasma eriocheiris is an emerging pathogen in freshwater crustaceans. In recent years, Eriocheir sinensis, Procambarus clarkii, Litopenaeus vannamei, Macrobrachium rosenbergii and Macrobrachium nipponense had been infected by this pathogen in China. An immunochromatographic strip test using gold nanoparticles was developed for rapidly detecting this pathogen. The strip test based on the principle of sandwich immunoassay by the specific combination between the pathogen and polyclonal antibody on a nitrocellulose membrane...
June 20, 2017: Journal of Fish Diseases
https://www.readbyqxmd.com/read/28630783/highly-sensitive-colorimetric-assay-for-determining-fe-3-based-on-gold-nanoparticles-conjugated-with-glycol-chitosan
#7
Kyungmin Kim, Yun-Sik Nam, Yeonhee Lee, Kang-Bong Lee
A highly sensitive and simple colorimetric assay for the detection of Fe(3+) ions was developed using gold nanoparticles (AuNPs) conjugated with glycol chitosan (GC). The Fe(3+) ion coordinates with the oxygen atoms of GC in a hexadentate manner (O-Fe(3+)-O), decreasing the interparticle distance and inducing aggregation. Time-of-flight secondary ion mass spectrometry showed that the bound Fe(3+) was coordinated to the oxygen atoms of the ethylene glycol in GC, which resulted in a significant color change from light red to dark midnight blue due to aggregation...
2017: Journal of Analytical Methods in Chemistry
https://www.readbyqxmd.com/read/28630626/rapid-and-selective-determination-of-folate-receptor-%C3%AE-with-sensitive-resonance-rayleigh-scattering-signal
#8
Liping Wu, Yue Liu, Rong Huang, Huawen Zhao, Weiqun Shu
A rapid, simple, and novel method for folate receptor α (FRα) determination is reported here. A probe of gold nanoparticles (Au NPs) modified with anti-FRα antibody was synthesized under the optimized conditions first. The antibody-modified Au NPs would aggregate when FRα was added to the probe for the specific interaction between antibody and antigen, resulting in the enhancement of resonance Rayleigh scattering (RRS) intensity. There is a linear relationship between the change of RRS intensity (ΔIRRS) and the concentration of FRα, with the detecting range of 0...
2017: International Journal of Analytical Chemistry
https://www.readbyqxmd.com/read/28630477/the-effect-of-shape-on-cellular-uptake-of-gold-nanoparticles-in-the-forms-of-stars-rods-and-triangles
#9
Xueping Xie, Jinfeng Liao, Xiaoru Shao, Qianshun Li, Yunfeng Lin
Gold nanomaterials have attracted considerable interest as vehicles for intracellular drug delivery. In our study, we synthesized three different shapes of methylpolyethylene glycol coated-anisotropic gold nanoparticles: stars, rods, and triangles. The cellular internalization of these nanoparticles by RAW264.7 cells was analyzed, providing a parametric evaluation of the effect of shape. The efficiency of cellular uptake of the gold nanoparticles was found to rank in the following order from lowest to highest: stars, rods, and triangles...
June 19, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28630340/enhancing-t1-magnetic-resonance-imaging-contrast-with-internalized-gadolinium-iii-in-a-multilayer-nanoparticle
#10
Valeria S Marangoni, Oara Neumann, Luke Henderson, Caterina C Kaffes, Hui Zhang, Runmin Zhang, Sandra Bishnoi, Ciceron Ayala-Orozco, Valtencir Zucolotto, James A Bankson, Peter Nordlander, Naomi J Halas
Multifunctional nanoparticles for biomedical applications have shown extraordinary potential as contrast agents in various bioimaging modalities, near-IR photothermal therapy, and for light-triggered therapeutic release processes. Over the past several years, numerous studies have been performed to synthesize and enhance MRI contrast with nanoparticles. However, understanding the MRI enhancement mechanism in a multishell nanoparticle geometry, and controlling its properties, remains a challenge. To systematically examine MRI enhancement in a nanoparticle geometry, we have synthesized MRI-active Au nanomatryoshkas...
June 19, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28629682/aquatic-live-animal-radiotracing-studies-for-ecotoxicological-applications-addressing-fundamental-methodological-deficiencies
#11
Tom Cresswell, Marc Metian, Lisa A Golding, Mike D Wood
The use of live animal gamma radioisotope tracer techniques in the field of ecotoxicology allows laboratory studies to accurately monitor contaminant biokinetics in real time for an individual organism. However, methods used in published studies for aquatic organisms are rarely described in sufficient detail to allow for study replication or an assessment of the errors associated with live animal radioanalysis to be identified. We evaluate the influence of some important methodological deficiencies through an overview of the literature on live aquatic animal radiotracer techniques and through the results obtained from our radiotracer studies on four aquatic invertebrate species...
June 16, 2017: Journal of Environmental Radioactivity
https://www.readbyqxmd.com/read/28629076/effect-of-acute-and-long-term-administration-of-gold-nanoparticles-on-biochemical-parameters-in-rat-brain
#12
Gabriela K Ferreira, Eria Cardoso, Francieli Silva Vuolo, Letícia Selinger Galant, Monique Michels, Cinara L Gonçalves, Gislaine Tezza Rezin, Felipe Dal-Pizzol, Roberto Benavides, Gabriel Alonso-Núñez, Vanessa Moraes Andrade, Emilio L Streck, Marcos Marques da Silva Paula
The present study investigated stress oxidative parameters and activities of enzymes of the energy metabolism in various brain structures. Rats were subjected to acute and long-term administration of gold nanoparticles (GNPs) with mean diameters of 10nm and 30nm. Adult (60days old) male Wistar rats received a single intraperitoneal injection (acute administration; 70μg·kg(-1)) or repeated injections once daily for 28days (long-term administration; 70μg·kg(-1)) of saline solution or GNPs (10nm or 30nm). Twenty-four hours after administration of the final dose, the animals were killed and the cerebral structures were isolated for enzyme analysis...
October 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28629040/3-aminopropyltrimethoxysilane-mediated-solvent-induced-synthesis-of-gold-nanoparticles-for-biomedical-applications
#13
Prem C Pandey, Gunjan Pandey, Alain Walcarius
The effect of acetone on 3-aminopropyltrimethoxysilane (3-APTMS) mediated synthesis of gold nanoparticles (AuNPs) in polar protic, polar aprotic and non polar solvents specifically water, acetone and chloroform has been studied. The findings revealed that acetone promotes the formation of siloxane polymer in chloroform and acetone solvents, but not in water, while AuNPs are formed in all cases. The bifunctional nature of 3-APTMS [NH2(CH2)3Si(OMe)3] controls the formation of siloxane polymer through hydrolysis and condensation of trimethoxysilyl group whereas the amine moieties are likely to form imine linkage, which are involved in the synthesis of gold nanoparticles...
October 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28628329/exploring-the-formation-of-symmetric-gold-nanostars-by-liquid-cell-transmission-electron-microscopy
#14
Nabeel Ahmad, Guillaume Wang, Jaysen Nelayah, Christian Ricolleau, Damien Alloyeau
The shape-dependent properties of gold nanostars (NSs) have motivated massive research efforts in the field of colloidal chemistry to gain a better control over the morphology of these promising nanostructures. Nevertheless, this challenge requires a better understanding of the atomic-scale processes leading to the formation of stellated nanoparticles. We hereby report an unprecedented in situ study focused on the seed-mediated synthesis of symmetric gold nanostars (NSs) performed by radiolysis in methanol...
June 19, 2017: Nano Letters
https://www.readbyqxmd.com/read/28628328/ph-switchable-interaction-of-a-carboxybetaine-ester-based-sam-with-dna-and-gold-nanoparticles
#15
Jaroslav Filip, Anton Popelka, Tomas Bertok, Alena Holazova, Josef Osicka, Jozef Kollar, Marketa Ilcikova, Jan Tkac, Peter Kasak
We describe a self-assembled monolayer (SAM) on a gold surface with carboxybetaine ester functionality to control the interaction between DNA and gold nanoparticles via pH. The negatively charged phosphate backbone of DNA interacts with and adsorbs to the positively charged carboxybetaine esters on the SAM. DNA release can be achieved by the hydrolysis of carboxybetaine ester (CBE) to a zwitterionic carboxybetaine state. Furthermore, the adsorption of negatively charged citrate-capped gold nanoparticles to a SAM-modified plain gold surface can be controlled by pH...
June 19, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28627892/an-approach-to-fabricate-compact-gold-nanoparticles-film-with-the-assistance-of-a-surfactant
#16
Huan Min, Jun Zhou, Xiaojue Bai, Linlin Li, Kai Zhang, Tieqiang Wang, Xuemin Zhang, Yunong Li, Yonghua Jiao, Xuan Qi, Yu Fu
We report a facile method to fabricate a compact Au nanoparticles film with the assistance of surfactants. First, the dodecanethiol-coated Au nanoparticles were floated on the surface of the toluene/acetonitrile mixture solvent and adjusted to an expanded dispersion by changing the mixture ratio. The silicone oil was then added as a surfactant to compress the floating nanoparticles from the original loose status to a closely-packed arrangement which produced a compact nanoparticle film. The relationship of the compressed film area with the silicone oil concentration was plotted and compared with the surface tension curve of silicone oil...
June 19, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28626569/importance-of-double-resonance-effects-in-two-photon-absorption-properties-of-au25-sr-18
#17
Zhongwei Hu, Lasse Jensen
The two-photon absorption (TPA) cross-sections of small thiolate-protected gold clusters have been shown to be much larger than typical small organic molecules. In comparison with larger nanoparticles, their TPA cross-sections per gold atom are also found to be larger. Theoretical simulations have suggested that the large enhancement of these TPA cross-sections comes from a one-photon double-resonance mechanism. However, it remains difficult to simulate TPA cross-sections of thiolate-protected gold clusters due to their large system size and a high density of states...
June 1, 2017: Chemical Science
https://www.readbyqxmd.com/read/28626560/selective-single-molecule-nanopore-sensing-of-proteins-using-dna-aptamer-functionalised-gold-nanoparticles
#18
Xiaoyan Lin, Aleksandar P Ivanov, Joshua B Edel
Single molecule detection methods, such as nanopore sensors have found increasing importance in applications ranging from gaining a better understanding of biophysical processes to technology driven solutions such as DNA sequencing. However, challenges remain especially in relation to improving selectivity to probe specific targets or to alternatively enable detection of smaller molecules such as small-sized proteins with a sufficiently high signal-to-noise ratio. In this article, we propose a solution to these technological challenges by using DNA aptamer-modified gold nanoparticles (AuNPs) that act as a molecular carrier through the nanopore sensor...
May 1, 2017: Chemical Science
https://www.readbyqxmd.com/read/28624216/gold-nanoparticles-for-bcr-abl1-gene-silencing-improving-tyrosine-kinase-inhibitor-efficacy-in-chronic-myeloid-leukemia
#19
Raquel Vinhas, Alexandra R Fernandes, Pedro V Baptista
Introduction of tyrosine kinase inhibitors for chronic myeloid leukemia treatment is associated with a 63% probability of maintaining a complete cytogenetic response, meaning that over 30% patients require an alternative methodology to overcome resistance, tolerance, or side effects. Considering the potential of nanotechnology in cancer treatment and the benefits of a combined therapy with imatinib, a nanoconjugate was designed to achieve BCR-ABL1 gene silencing. Gold nanoparticles were functionalized with a single-stranded DNA oligonucleotide that selectively targets the e14a2 BCR-ABL1 transcript expressed by K562 cells...
June 16, 2017: Molecular Therapy. Nucleic Acids
https://www.readbyqxmd.com/read/28623817/development-of-a-simple-and-convenient-cell-based-electrochemical-biosensor-for-evaluating-the-individual-and-combined-toxicity-of-don-zen-and-afb1
#20
Shuang Xia, Pei Zhu, Fuwei Pi, Yinzhi Zhang, Yun Li, Jiasheng Wang, Xiulan Sun
A simple and convenient cell-based electrochemical biosensor was developed to assess the individual and combined toxicity of deoxynivalenol (DON), zearalenone (ZEN), and Aflatoxin B1 (AFB1) on Hep G2 cells. The sensor was modified in succession with AuNPs (gold nanoparticles), cysteamine, and laminin. The cells interacting with laminin formed tight cell-to-electrode contacts, and collagen was used to maintain cell adhesion and viability. Electrochemical impedance spectroscopy (EIS) was developed to evaluate mycotoxin toxicity...
June 14, 2017: Biosensors & Bioelectronics
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