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cell internalization nanoparticles

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https://www.readbyqxmd.com/read/28324866/long-term-bioavailability-of-redox-nanoparticles-effectively-reduces-organ-dysfunctions-and-death-in-whole-body-irradiated-mice
#1
Chitho P Feliciano, Koji Tsuboi, Kenshi Suzuki, Hiroyuki Kimura, Yukio Nagasaki
Radioprotective agents have been developed to protect patients against the damaging and lethal effects of ionizing radiation. However, in addition to the intrinsic ability to target reactive oxygen species (ROS), the ability to retain a significant level of bioavailability is desirable in radioprotective agents because that would increase and prolong their radioprotective efficacy and improve its safety. Here, we report the development of a novel nanoparticle-based radioprotective agent with improved bioavailability, which suppressed the adverse effects typically associated with low-molecular-weight (LMW) antioxidants...
March 14, 2017: Biomaterials
https://www.readbyqxmd.com/read/28323636/ultrasmall-water-dispersible-tween80-modified-yb-er-nagd-wo-sub-4-sub-sub-2-sub-nanoparticles-with-record-upconversion-ratiometric-thermal-sensitivity-and-their-internalization-by-mesenchymal-stem-cells
#2
Concepcion Cascales, Carlos Paino, Eulalia Bazán, Carlos Zaldo
This work presents the synthesis by coprecipitation of diamond shaped Yb:Er:NaGd(WO<sub>4</sub>)<sub>2</sub> crystalline nanoparticles (NPs) with diagonal dimensions in the 5-7 nm × 10-12 nm range which have been modified with TWEEN80 for their dispersion in water, and their interaction with mesenchymal stem cells (MSCs) proposed as cellular NP vehicles. These NPs belong to a large family of tetragonal Yb:Er:NaT(XO<sub>4</sub>)<sub>2</sub> (T=Y, La, Gd, Lu; X= Mo, W) compounds with green (<sup>2</sup>H<sub>11/2</sub>+<sup>4</sup>S<sub>3/2</sub>→<sup>4</sup>I<sub>15/2</sub>) Er-related upconversion (UC) efficiency comparable to that of Yb:Er:β-NaYF<sub>4</sub> reference compound, but with a ratiometric thermal sensitivity (S) 2...
March 21, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28302144/a-dosimetric-model-for-the-heterogeneous-delivery-of-radioactive-nanoparticles-in-vivo-a-feasibility-study
#3
Andrew B Satterlee, Peter Attayek, Bentley Midkiff, Leaf Huang
ᅟ: Accurate and quantitative dosimetry for internal radiation therapy can be especially challenging, given the heterogeneity of patient anatomy, tumor anatomy, and source deposition. Internal radiotherapy sources such as nanoparticles and monoclonal antibodies require high resolution imaging to accurately model the heterogeneous distribution of these sources in the tumor. The resolution of nuclear imaging modalities is not high enough to measure the heterogeneity of intratumoral nanoparticle deposition or intratumoral regions, and mathematical models do not represent the actual heterogeneous dose or dose response...
March 17, 2017: Radiation Oncology
https://www.readbyqxmd.com/read/28301688/multiplex-single-cell-quantification-of-rare-rna-transcripts-from-protoplasts-in-a-model-plant-system
#4
Ulhas S Kadam, Burkhard Schulz, Joseph M K Irudayaraj
Here we demonstrate multiplex and simultaneous detection of four different rare RNA species from plant, Arabidopsis thaliana, using surface enhanced Raman spectroscopy and gold nanoprobes at single cell resolution. We show the applicability of nanoparticle-based Raman spectroscopic sensor to study intracellular RNA copies. First, we demonstrate that gold-nanoparticles decorate with Raman probes and carrying specific nucleic acid probe sequences can be uptaken by the protoplasts. We confirm the internalization of gold nanoprobes by TEM, ICP-MS, and fluorescence imaging...
March 16, 2017: Plant Journal: for Cell and Molecular Biology
https://www.readbyqxmd.com/read/28301223/antitumor-effect-of-nanoparticle-131-i-labeled-arginine-glycine-aspartate-bovine-serum-albumin-polycaprolactone-in-lung-cancer
#5
Hui Ming, Lei Fang, Jingmei Gao, Chengxia Li, Yanhui Ji, Yiming Shen, Yiming Hu, Ning Li, Jin Chang, Wei Li, Jian Tan
OBJECTIVE: The aim of the present study is to investigate the biologic effects of internal irradiation and the therapeutic effectiveness of (131)I-labeled arginine-glycine-aspartate (RGD)-bovine serum albumin (BSA)-polycaprolactone (PCL) ((131)I-RGD-BSA-PCL) in murine lung cancer models. MATERIALS AND METHODS: The target binding and cellular uptake of NCI-H460 lung cancer cells overexpressing integrin αvβ3 were observed by confocal microscopy. Flow cytometry was used to assay apoptosis...
March 16, 2017: AJR. American Journal of Roentgenology
https://www.readbyqxmd.com/read/28298974/zeolite-silver-zinc-nanoparticles-biocompatibility-and-their-effect-on-the-compressive-strength-of-mineral-trioxide-aggregate
#6
Mohammad Samiei, Negin Ghasemi, Naser Asl-Aminabadi, Baharak Divband, Yasamin Golparvar-Dashti, Sajjad Shirazi
BACKGROUND: This study was carried out to evaluate the biocompatibility of zeolite-silver-zinc (Ze-Ag-Zn) nanoparticles and their effect on the compressive strength of Mineral Trioxide Aggregate (MTA). MATERIAL AND METHODS: Biocompatibility was evaluated by an MTT assay on the pulmonary adenocarcinoma cells with 0.05, 0.1, 0.25, 0.5, 1 and 5 mg/mL concentrations of Ze-Ag-Zn. For compressive strength test, four groups containing 15 stainless-steel cylinders with an internal diameter of 4 and a height of 6 mm were prepared and MTA (groups 1 and 2) or MTA + 2% Ze-Ag-Zn (groups 3 and 4) were placed in the cylinders...
March 2017: Journal of Clinical and Experimental Dentistry
https://www.readbyqxmd.com/read/28296410/a-light-responsive-nanoparticle-based-delivery-system-using-pheophorbide-a-graft-polyethyleneimine-for-dendritic-cell-based-cancer-immunotherapy
#7
Chuangnian Zhang, Ju Zhang, Gaona Shi, Huijuan Song, Shengbin Shi, Xiuyuan Zhang, Pingsheng Huang, Zhihong Wang, Weiwei Wang, Chun Wang, Deling Kong, Chen Li
In this study, the photochemical internalization (PCI) technique was adopted in a nanoparticle-based antigen delivery system to enhance antigen-specific CD8(+) T cell immune response for cancer immunotherapy. Pheophorbide-A, a hydrophobic photosensitizer, grafted with polyethyleneimine (PheoA-PEI) with endosome escape activity and near infrared imaging capability was prepared. A model antigen ovalbumin (OVA) was then complexed with PheoA-PEI to form PheoA-PEI/OVA nanoparticles (PheoA-PEI/OVA NPs) that are responsive to light...
March 15, 2017: Molecular Pharmaceutics
https://www.readbyqxmd.com/read/28296387/tumor-triggered-geometrical-shape-switch-of-chimeric-peptide-for-enhanced-in-vivo-tumor-internalization-and-photodynamic-therapy
#8
Kai Han, Jin Zhang, Weiyun Zhang, Shibo Wang, Luming Xu, Chi Zhang, Xianzheng Zhang, Heyou Han
Geometrical shape of nanoparticles plays an important role in cellular internalization. However, the applicability in tumor selective therapeutics is still scarcely reported. In this article, we designed a tumor extracellular acidity-responsive chimeric peptide with geometrical shape switch for enhanced tumor internalization and photodynamic therapy. This chimeric peptide could self-assemble into spherical nanoparticles at physiological condition. While at tumor extracellular acidic microenvironment, chimeric peptide underwent detachment of acidity-sensitive 2,3-dimethylmaleic anhydride groups...
March 17, 2017: ACS Nano
https://www.readbyqxmd.com/read/28293102/paclitaxel-loaded-star-shaped-copolymer-nanoparticles-for-enhanced-malignant-melanoma-chemotherapy-against-multidrug-resistance
#9
Yongsheng Su, Jian Hu, Zhibin Huang, Yubin Huang, Bingsheng Peng, Ni Xie, Hui Liu
Malignant melanoma (MM) is the most dangerous type of skin cancer with annually increasing incidence and death rates. However, chemotherapy for MM is restricted by low topical drug concentration and multidrug resistance. In order to surmount the limitation and to enhance the therapeutic effect on MM, a new nanoformulation of paclitaxel (PTX)-loaded cholic acid (CA)-functionalized star-shaped poly(lactide-co-glycolide) (PLGA)-D-α-tocopheryl polyethylene glycol 1000 succinate (TPGS) nanoparticles (NPs) (shortly PTX-loaded CA-PLGA-TPGS NPs) was fabricated by a modified method of nanoprecipitation...
2017: Drug Design, Development and Therapy
https://www.readbyqxmd.com/read/28291743/lactobionic-acid-conjugated-tpgs-nanoparticles-for-enhancing-therapeutic-efficacy-of-etoposide-against-hepatocellular-carcinoma
#10
Altansukh Tsend-Ayush, Xiumei Zhu, Yu Ding, Jianxu Yao, Lifang Yin, Zhou Jianping, Jing Yao
Many effective anticancer drugs are limited to use for hepatocellular carcinoma (HCC) therapy due to drug resistance mechanisms in liver cells. In recent years, tumor-targeted drug delivery and inhibition of drug resistance-related mechanisms become an integrated strategy to combat effectively chemo-resistant cancer. Herein, lactobionic acid-conjugated D-α-Tocopheryl polyethylene glycol 1000 succinate (TPGS-LA conjugate) was developed as a potential asialoglycoprotein receptor (ASGPR)-targeted nanocarrier and an efficient inhibitor of P-glycoprotein (P-gp) to enhance etoposide (ETO) efficacy against HCC...
March 14, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28286038/multi-stimuli-responsive-biohybrid-nanoparticles-with-cross-linked-albumin-coronae-self-assembled-by-a-polymer-protein-biodynamer
#11
Lin Wang, Li Liu, Bingyang Dong, Hanying Zhao, Mingming Zhang, Wenjuan Chen, Yanhang Hong
A thermoresponsive polymer-protein biodynamer was prepared via the bioconjugation of an aliphatic aldehyde-functionalized copolymer to hydrazine-modified bovine serum albumin (BSA) through reversible pyridylhydrazone linkages. Sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE) and size exclusion chromatography (SEC) results indicated that the pyridylhydrazone linkages cleaved in an intracellular-mimicking acidic milieu, thus leading to the release of BSA. The dynamic character of the protein biodynamer was demonstrated by exchange reactions with aldehyde-containing molecules...
March 7, 2017: Acta Biomaterialia
https://www.readbyqxmd.com/read/28284919/nanostructured-monolinolein-miniemulsions-as-delivery-systems-role-of-the-internal-mesophase-on-cytotoxicity-and-cell-internalization
#12
Samuel Guillot, Fabienne Méducin, Kristina Poljak, Virginie Malard, Alexandra Foucault-Collet, Sébastien Serieye, Chantal Pichon
Recent advances in nanoparticle systems for improved drug delivery display a great potential for the administration of active molecules. Here, lipid miniemulsions with various internal nanostructures were loaded with the chemotherapeutic agent Paclitaxel. The goal is to assess the impact of internal structures on their efficiency. Previously the structure, the stability and the physico-chemical properties of those carriers were characterized. Modalities of action were addressed by the evaluation of their effects on the tumor cells viability, their cellular uptake by flow cytometry and confocal microscopy detection of fluorescently labeled nanostructured miniemulsions...
March 8, 2017: International Journal of Pharmaceutics
https://www.readbyqxmd.com/read/28283715/label-free-visualization-of-nilotinib-functionalized-gold-nanoparticles-within-single-mammalian-cells-by-c60-sims-imaging
#13
Anna N Bloom, Hua Tian, Christian Schoen, Nicholas Winograd
Obtaining a comprehensive grasp of the behavior and interaction of pharmaceutical compounds within single cells provides some of the fundamental details necessary for more effective drug development. In particular, the changes ensuing in the carrier, drug, and host environment in targeted drug therapy applications must be explored in greater detail, as these are still not well understood. Here, nilotinib-functionalized gold nanoparticles are examined within single mammalian cells with use of imaging cluster secondary ion mass spectrometry in a model study designed to enhance our understanding of what occurs to these particles once that have been internalized...
March 10, 2017: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/28283294/ceo2-nps-toxic-or-protective-to-phytoplankton-charge-of-nanoparticles-and-cell-wall-as-factors-which-cause-changes-in-cell-complexity
#14
M Sendra, P M Yeste, I Moreno-Garrido, J M Gatica, J Blasco
CeO2 nanoparticles (CeO2 NPs) are well-known for their catalytic properties and antioxidant potential. Recent uses in therapy are based on the Ce(+3) ions released by CeO2 NPs. Reactions involving redox cycles between Ce(+3) and Ce(+4) oxidation stage seem to promote scavenging of reactive oxygen species (ROS), thus protecting cells from oxygen damage. However, the internalization of CeO2 NPs and release of Ce(+3) could be responsible for a toxic effect on cells. The literature reports controversial results on the toxicity of CeO2 NPs to phytoplankton...
March 7, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28280329/multifunctional-organic-inorganic-hybrid-nanoparticles-and-nanosheets-based-on-chitosan-derivative-and-layered-double-hydroxide-cellular-uptake-mechanism-and-application-for-topical-ocular-drug-delivery
#15
Huibo Chi, Yan Gu, Tingting Xu, Feng Cao
To study the cellular uptake mechanism of multifunctional organic-inorganic hybrid nanoparticles and nanosheets, new chitosan-glutathione-valine-valine-layered double hydroxide (CG-VV-LDH) nanosheets with active targeting to peptide transporter-1 (PepT-1) were prepared, characterized and further compared with CG-VV-LDH nanoparticles. Both organic-inorganic hybrid nanoparticles and nanosheets showed a sustained release in vitro and prolonged precorneal retention time in vivo, but CG-VV-LDH nanoparticles showed superior permeability in the isolated cornea of rabbits than CG-VV-LDH nanosheets...
2017: International Journal of Nanomedicine
https://www.readbyqxmd.com/read/28279933/in-situ-biodegradable-crosslinking-of-cationic-oligomer-coating-on-mesoporous-silica-nanoparticles-for-drug-delivery
#16
Yifeng Wang, Jine Wang, Yang Yang, Yi Sun, Yuan Yuan, Yulin Li, Changsheng Liu
Although layer-by-layer assembly using anionic and cationic polymer has been a popular way to develop core-shell nanoparticles, the strong electrostatic interactions may limit shell degradability, thus hampering their application as a platform for controlled therapeutic delivery. In this study, we demonstrate a simple approach to developing mesoporous nanohybrids via a process of pre-drug loading (using doxorubicin (DOX) as a model drug) into mesoporous silica nanoparticles (MSN), followed by surface functionalization with a kind of cationic oligomer (low molecular weight polyethylene imine, LPEI) and in situ crosslinking by degradable N,N'-bis(acryloyl)cystamine (BAC)...
February 27, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/28279737/targeting-tumors-with-cyclic-rgd-conjugated-lipid-nanoparticles-loaded-with-an-ir780-nir-dye-in-vitro-and-in-vivo-evaluation
#17
Jungyoon Choi, Emilie Rustique, Maxime Henry, Mélanie Guidetti, Véronique Josserand, Lucie Sancey, Jérôme Boutet, Jean-Luc Coll
Like several 50nm-large nanocarriers, lipid nanoparticles (LNPs) can passively accumulate in tumors through the Enhanced Permeability and Retention effect. In this study, we developed PEGylated LNPs loaded with IR780 iodide as a contrast agent for NIR fluorescence imaging and modified them with cyclic RGD peptides in order to target integrin avβ3. We demonstrate a specific targeting of the receptor with cRGD-LNPs but not with cRAD-LNP and standard LNP using HEK293(β3), HEK293(β3)-αvRFP, DU145 and PC3 cell lines...
March 6, 2017: International Journal of Pharmaceutics
https://www.readbyqxmd.com/read/28269979/in-situ-monitoring-intracellular-structural-change-of-nanovehicles-through-photoacoustic-signals-based-on-phenylboronate-linked-rgd-dextran-purpurin-18-conjugates
#18
Dong-Bing Cheng, Guo-Bin Qi, Jing-Qi Wang, Yong Cong, Fu-Hua Liu, Haijun Yu, Zeng-Ying Qiao, Hao Wang
The stimuli-responsive polymeric nanocarriers have been studied extensively, and their structural changes in cells are important for the controlled intracellular drug release. The present work reported RGD-dextran/purpurin 18 conjugates with pH-responsive phenylboronate as spacer for monitoring the structural change of nanovehicles through ratiometric photoacoustic (PA) signal. Phenylboronic acid modified purpurin 18 (NPBA-P18) could attach onto the RGD-decorated dextran (RGD-Dex), and the resulting RGD-Dex/NPBA-P18 (RDNP) conjugates with different molar ratios of RGD-Dex and NPBA-P18 were prepared...
March 14, 2017: Biomacromolecules
https://www.readbyqxmd.com/read/28266206/characterization-of-calcium-phosphate-nanoparticles-based-on-a-pegylated-chelator-for-gene-delivery
#19
Xiangang Huang, Diana Andina, Jingshui Ge, Anne Labarre, Jean-Christophe Leroux, Bastien Castagner
Calcium phosphate (CaP) nanoparticles are promising gene delivery carriers due to their bioresorbability, ease of preparation, high gene loading efficacy, and endosomal escape properties. However, the rapid aggregation of the particles needs to be addressed in order to have potential in vivo. In addition, there is a need to better understand the relationship between CaP nanoparticle properties and their interactions with cells. Here, a new synthesis route involving click chemistry was developed to prepare the PEGylated chelator PEG-inositol 1,3,4,5,6-pentakisphosphate (PEG-IP5) that can coat and stabilize CaP nanoparticles...
March 14, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28254282/tpgs-chitosan-cross-linked-targeted-nanoparticles-for-effective-brain-cancer-therapy
#20
Poornima Agrawal, Rahul Pratap Singh, Sonali, Laksmi Kumari, Gunjan Sharma, Biplob Koch, Chellapa V Rajesh, Abhishesh K Mehata, Sanjay Singh, Bajarangprasad L Pandey, Madaswamy S Muthu
Brain cancer, up-regulated with transferrin receptor led to concept of transferrin receptor targeted anticancer therapeutics. Docetaxel loaded d-α-tocopherol polyethylene glycol 1000 succinate conjugated chitosan (TPGS-chitosan) nanoparticles were prepared with or without transferrin decoration. In vitro experiments using C6 glioma cells showed that docetaxel loaded chitosan nanoparticles, non-targeted and transferrin receptor targeted TPGS-chitosan nanoparticles have enhanced the cellular uptake and cytotoxicity...
May 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
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