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Nanoparticles and molecular imaging

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https://www.readbyqxmd.com/read/29656235/effective-cancer-immunotherapy-in-mice-by-polyic-imiquimod-complexes-and-engineered-magnetic-nanoparticles
#1
Ana Isabel Bocanegra Gondan, Ane Ruiz-de-Angulo, Aintzane Zabaleta, Nina Gómez Blanco, Beatriz Macarena Cobaleda-Siles, María Jesús García-Granda, Daniel Padro, Jordi Llop, Blanca Arnaiz, María Gato, David Escors, Juan C Mareque-Rivas
Encouraging results are emerging from systems that exploit Toll like receptor (TLR) signaling, nanotechnology, checkpoint inhibition and molecular imaging for cancer immunotherapy. A major remaining challenge is developing effective, durable and tumour-specific immune responses without systemic toxicity. Here, we report a simple and versatile system based on synergistic activation of immune responses and direct cancer cell killing by combined TLR ligation using polyIC as TLR3 and imiquimod (R837) as TLR7 agonist, in combination with the model antigen ovalbumin (OVA) and phospholipid micelles loaded with zinc-doped iron oxide magnetic nanoparticles (MNPs)...
April 3, 2018: Biomaterials
https://www.readbyqxmd.com/read/29652061/bevacizumab-and-near-infrared-probe-conjugated-iron-oxide-nanoparticles-for-vascular-endothelial-growth-factor-targeted-mr-and-optical-imaging
#2
Run Lin, Jing Huang, Liya Wang, Yuancheng Li, Malgorzata Lipowska, Hui Wu, Jianyong Yang, Hui Mao
Vascular endothelial growth factor (VEGF) plays a pivotal role in the cascade of development and progression of cancers. Targeting this cancer hallmark is a logical strategy for imaging based cancer detection and monitoring the anti-angiogenesis treatment. Using Bevacizumab (Avastin®), which is a recombinant humanized monoclonal antibody directly against VEGF and an angiogenesis inhibitor, as a targeting ligand, a multimodal VEGF targeted molecular imaging probe was developed by conjugating near infrared dye (NIR830) labeled bevacizumab to magnetic iron oxide nanoparticles (IONP) for optical and magnetic resonance (MR) imaging of cancers over-expressing VEGF...
April 13, 2018: Biomaterials Science
https://www.readbyqxmd.com/read/29644847/preparation-of-microkernel-based-mesoporous-sio2-cdte-sio2-sio2-fluorescent-nanoparticles-for-imaging-screening-and-enrichment-of-heat-shock-protein-90-inhibitors-from-tripterygium-wilfordii
#3
Yue Hu, Zhao Yi Miao, Xiaojing Zhang, Xiaotong Yang, Yingying Tang, Sheng Yu, ChenXiao Shan, Hongmei Wen, Dong Zhu
The currently utilized ligand fishing for bioactive molecular screening from complex matrixes cannot perform imaging screening. Here, we developed a new solid-phase ligand fishing coupled with in situ imaging protocol for the specific enrichment and identification of heat shock protein 90 (Hsp 90) inhibitors from Tripterygium wilfordii, utilizing a multiple-layer and microkernel-based mesoporous nanostructure composed of a protective silica coating CdTe quantum dots (QDs) core and a mesoporous silica shell, i...
April 12, 2018: Analytical Chemistry
https://www.readbyqxmd.com/read/29626815/spectroscopic-and-photoacoustic-characterization-of-encapsulated-iron-oxide-super-paramagnetic-nanoparticles-as-a-new-multiplatform-contrast-agent
#4
Paolo Armanetti, Alessandra Flori, Cinzia Avigo, Luca Conti, Barbara Valtancoli, Debora Petroni, Saer Doumett, Laura Cappiello, Costanza Ravagli, Giovanni Baldi, Andrea Bencini, Luca Menichetti
Recently, a number of photoacoustic (PA) agents with increased tissue penetration and fine spatial resolution have been developed for molecular imaging and mapping of pathophysiological features at the molecular level. Here, we present bio-conjugated near-infrared light-absorbing magnetic nanoparticles as a new agent for PA imaging. These nanoparticles exhibit suitable absorption in the near-infrared region, with good photoacoustic signal generation efficiency and high photo-stability. Furthermore, these encapsulated iron oxide nanoparticles exhibit strong super-paramagnetic behavior and nuclear relaxivities that make them useful as magnetic resonance imaging (MRI) contrast media as well...
March 15, 2018: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/29624828/polymeric-nanoparticles-with-glutathione-sensitive-heterodimeric-multifunctional-prodrug-for-in-vivo-drug-monitoring-and-synergistic-cancer-therapy
#5
Fuwu Zhang, Qianqian Ni, Orit Jacobson, Siyuan Cheng, Arthur Liao, Zhantong Wang, Zhimei He, Guocan Yu, Jibin Song, Ying Ma, Gang Niu, Longjiang Zhang, Guizhi Zhu, Xiaoyuan Chen
Polymeric micelle-based drug delivery systems have dramatically improved the delivery of small molecular drugs, yet multiple challenges remain to be overcome. In this work, we engineered a polymeric nanomedicine that possesses an ultrahigh loading (59%) of a glutathione (GSH)-sensitive heterodimeric multifunctional prodrug (HDMP) to effectively co-deliver two synergistic drugs to tumor. Specifically, an HDMP comprising of chemotherapeutic camptothecin (CPT) and photosensitizer 2-(1-hexyloxyethyl)-2-devinyl pyropheophorbide-α (HPPH), was conjugated via a GSH-cleavable linkage...
April 6, 2018: Angewandte Chemie
https://www.readbyqxmd.com/read/29617110/electrochromic-molecular-imprinting-sensor-for-visual-and-smartphone-based-detections
#6
Denise Capoferri, Ruslan Alvarez-Diduk, Michele Del Carlo, Dario Compagnone, Arben Merkoçi
Electrochromic effect and molecularly imprinted technology have been used to develop a sensitive and selective electrochromic sensor. The polymeric matrices obtained using the imprinting technology are robust molecular recognition elements and have the potential to mimic natural recognition entities with very high selectivity. The electrochromic behavior of iridium oxide nanoparticles (IrOx NPs) as physicochemical transducer together with a molecularly imprinted polymer (MIP) as recognition layer resulted in a fast and efficient translation of the detection event...
April 4, 2018: Analytical Chemistry
https://www.readbyqxmd.com/read/29614862/nanomaterial-interactions-with-biomembranes-bridging-the-gap-between-soft-matter-models-and-biological-context
#7
Marco Werner, Thorsten Auth, Paul A Beales, Jean Baptiste Fleury, Fredrik Höök, Holger Kress, Reid C Van Lehn, Marcus Müller, Eugene P Petrov, Lev Sarkisov, Jens-Uwe Sommer, Vladimir A Baulin
Synthetic polymers, nanoparticles, and carbon-based materials have great potential in applications including drug delivery, gene transfection, in vitro and in vivo imaging, and the alteration of biological function. Nature and humans use different design strategies to create nanomaterials: biological objects have emerged from billions of years of evolution and from adaptation to their environment resulting in high levels of structural complexity; in contrast, synthetic nanomaterials result from minimalistic but controlled design options limited by the authors' current understanding of the biological world...
April 3, 2018: Biointerphases
https://www.readbyqxmd.com/read/29614858/vapor-phase-nanopatterning-of-aminosilanes-with-electron-beam-lithography-understanding-and-minimizing-background-functionalization
#8
Christopher R Fetterly, Brian C Olsen, Erik J Luber, Jillian M Buriak
Electron beam lithography (EBL) is a highly precise, serial method for patterning surfaces. Positive tone EBL resists enable patterned exposure of the underlying surface, which can be subsequently functionalized for the application of interest. In the case of widely-used native oxide-capped silicon surfaces, coupling of an activated silane with electron beam lithography would enable nanoscale chemical patterning of the exposed regions. Aminoalkoxysilanes are extremely useful due to their reactive amino functionality, but have seen little attention for nanopatterning silicon surfaces with an EBL resist due to background contamination...
April 3, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/29608275/the-effect-of-molecular-structure-on-cytotoxicity-and-antitumor-activity-of-pegylated-nanomedicines
#9
Wenhai Lin, Lei Yin, Tingting Sun, Tingting Wang, Zhigang Xie, Jingkai Gu, Xiabin Jing
Fundamental studies on the cellular uptake and drug release of PEGylated nanomedicines are beneficial to understand their fate in vivo and construct ideal nanoparticle formulations. In this work, the detailed metabolic process of PEGylated doxorubicin (Dox) nanomedicines were investigated via confocal laser scanning microscopy (CLSM), flow cytometry (FCM), cytotoxicity test, fluorescence imaging in vivo (FLIV) and liquid chromatography tandem mass spectrometry (LC-MS/MS). Among them, only LC-MS/MS could determine accurately the content of PEGylated Dox and Dox in vitro and in vivo...
April 2, 2018: Biomacromolecules
https://www.readbyqxmd.com/read/29604440/nanoaggregates-of-iron-poly-oxo-clusters-obtained-by-laser-ablation-in-aqueous-solution-of-phosphonates
#10
Giulio Fracasso, Paolo Ghigna, Luca Nodari, Stefano Agnoli, Denis Badocco, Paolo Pastore, Elena Nicolato, Pasquina Marzola, Dušan Mihajlović, Milan Markovic, Miodrag Čolić, Vincenzo Amendola
Laser ablation in liquid (LAL) emerged as a versatile technique for the synthesis of nanoparticles with various structures and compositions, although the control over products remains challenging in most cases. For instance, it is still difficult to drive the size of metal oxide crystalline domains down to the level of few atom clusters with LAL. Here we demonstrate that laser ablation of a bulk iron target in aqueous solution of phosphonates gives phosphonate-grafted iron oxo-clusters polymerized into nanoaggregates with Fe:ligand ratio of 2:1, instead of the usual nanocrystalline iron oxides...
March 20, 2018: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/29603084/multi-faceted-characterization-of-wet-milled-griseofulvin-nanosuspensions-for-elucidation-of-aggregation-state-and-stabilization-mechanisms
#11
M Li, P Alvarez, P Orbe, E Bilgili
Characterization of wet-milled drug suspensions containing neutral polymer-anionic surfactant as stabilizers poses unique challenges in terms of assessing the aggregation state and examining the stabilization mechanisms. Using a multi-faceted characterization method, this study aims to assess the aggregation state of wet-milled griseofulvin (GF) nanosuspensions and elucidate the stabilization mechanisms and impact of stabilizers. Two grades, SSL and L, of hydroxypropyl cellulose (HPC) with molecular weights of 40 and 140 kg/mol, respectively, were used as a neutral stabilizer at concentrations varying from 0 to 7...
March 30, 2018: AAPS PharmSciTech
https://www.readbyqxmd.com/read/29597298/probing-interactions-between-aunps-agnps-and-giant-unilamellar-vesicles-guvs-using-hyperspectral-dark-field-microscopy
#12
Anupama Bhat, Kewei Huan, Tiana Cooks, Hacene Boukari, Qi Lu
Noble metallic nanoparticles (NPs) such as gold and silver nanoparticles (AuNPs and AgNPs) have been shown to exhibit anti-tumor effect in anti-angiogenesis, photothermal and radio therapeutics. On the other hand, cell membranes are critical locales for specific targeting of cancerous cells. Therefore, NP-membrane interactions need be studied at molecular level to help better understand the underlying physicochemical mechanisms for future applications in cancer nanotechnology. Herein, we report our study on the interactions between citrate stabilized colloidal AuNPs/AgNPs (10 nm in size) and giant unilamellar vesicles (GUVs) using hyperspectral dark-field microscopy...
March 28, 2018: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/29596317/distribution-of-glutathione-stabilized-gold-nanoparticles-in-feline-fibrosarcomas-and-their-role-as-a-drug-delivery-system-for-doxorubicin-preclinical-studies-in-a-murine-model
#13
Katarzyna Zabielska-Koczywąs, Anna Wojtalewicz, Ewelina Użarowska, Agata Klejman, Agata Wojtkowska, Izabella Dolka, Marek Wojnicki, Katarzyna Sobczak, Michał Wójcik, Haifa Shen, Mauro Ferrari, Roman Lechowski
Feline injection site sarcomas (FISS) are malignant skin tumors with high recurrence rates despite the primary treatment of radical surgical resections. Adjunctive radiotherapy or chemotherapy with doxorubicin is mostly ineffective. Cellular and molecular causes of multidrug resistance, specific physio-chemical properties of solid tumors impairing drug transport, and the tumor microenvironment have been indicated for causing standard chemotherapy failure. Gold nanoparticles are promising imaging tools, nanotherapeutics, and drug delivery systems (DDS) for chemotherapeutics, improving drug transport within solid tumors...
March 29, 2018: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/29578215/%C3%AE-lipoic-acid-stabilized-dtx-ir780-micelles-for-photoacoustic-fluorescence-imaging-guided-photothermal-therapy-chemotherapy-of-breast-cancer
#14
WenTing Li, JinRong Peng, Qian Yang, LiJuan Chen, Lan Zhang, XiaoXin Chen, ZhiYong Qian
Micellar nanoparticles have unique advantages as carriers for therapeutic or imaging agents, owing to their smaller size and better penetration of tumors. However, some agents, due to their physical or chemical properties, are difficult to load into micelles. IR780 is one of these agents, and is also a promising near-infrared dye for fluorescence imaging (FI)/photoacoustic imaging (PAI) and cancer photothermal therapy (PTT). Its hydrophobic and high crystallization structure results in limited bioavailability in vivo...
March 26, 2018: Biomaterials Science
https://www.readbyqxmd.com/read/29574092/plectin-1-targeted-dual-modality-nanoparticles-for-pancreatic-cancer-imaging
#15
Xiao Chen, Hao Zhou, Xiaoshuang Li, Na Duan, Shouyou Hu, Yongkang Liu, Yali Yue, Lina Song, Yifen Zhang, Donghui Li, Zhongqiu Wang
BACKGROUND: Biomarker-targeted molecular imaging holds promise for early detection of pancreatic cancer. The aim of this study was to design and evaluate a plectin-1 targeted multi-functional nanoparticle probe for pancreatic cancer imaging. METHODS: 1,2-Distearoyl-sn-glycero-3-phosphoethanolamine-N-amino(polyethylene glycol) (DSPE-PEG-NH2)-modified superparamagnetic iron oxide (Fe3 O4 ) nanoparticles (SPION) were conjugated with plectin-1 antibody and/or Cy7 to create the multi-functional targeted nanoparticle targeted probe (Plectin-SPION-Cy7) or non-targeted probe (SPION-Cy7)...
March 15, 2018: EBioMedicine
https://www.readbyqxmd.com/read/29573545/nanostructuring-lipophilic-dyes-in-water-using-stable-vesicles-quatsomes-as-scaffolds-and-their-use-as-probes-for-bioimaging
#16
Antonio Ardizzone, Siarhei Kurhuzenkau, Sílvia Illa-Tuset, Jordi Faraudo, Mykhailo Bondar, David Hagan, Eric W Van Stryland, Anna Painelli, Cristina Sissa, Natalia Feiner, Lorenzo Albertazzi, Jaume Veciana, Nora Ventosa
A new kind of fluorescent organic nanoparticles (FONs) is obtained using quatsomes (QSs), a family of nanovesicles proposed as scaffolds for the nanostructuration of commercial lipophilic carbocyanines (1,1'-dioctadecyl-3,3,3',3'-tetramethyl-indocarbocyanine perchlorate (DiI), 1,1'-dioctadecyl-3,3,3',3'-tetramethyl-indodicarbocyanine perchlorate (DiD), and 1,1'-dioctadecyl-3,3,3',3'-tetramethyl-indotricarbocyanine iodide (DiR)) in aqueous media. The obtained FONs, prepared by a CO2 -based technology, show excellent colloidal- and photostability, outperforming other nanoformulations of the dyes, and improve the optical properties of the fluorophores in water...
March 24, 2018: Small
https://www.readbyqxmd.com/read/29571054/understanding-interactions-between-biomaterials-and-biological-systems-using-proteomics
#17
REVIEW
Ziryan Othman, Berta Cillero Pastor, Sabine van Rijt, Pamela Habibovic
The role that biomaterials play in the clinical treatment of damaged organs and tissues is changing. While biomaterials used in permanent medical devices were required to passively take over the function of a damaged tissue in the long term, current biomaterials are expected to trigger and harness the self-regenerative potential of the body in situ and then to degrade, the foundation of regenerative medicine. To meet these different requirements, it is imperative to fully understand the interactions biomaterials have with biological systems, in space and in time...
March 12, 2018: Biomaterials
https://www.readbyqxmd.com/read/29560995/intracellular-self-assembly-of-ru-bpy-3-2-nanoparticles-enables-persistent-phosphorescence-imaging-of-tumors
#18
Jindan Li, Zijuan Hai, Huiqiong Xiao, Xiaoyi Yi, Gaolin Liang
Nanoprobes are advantageous over small molecular probes in sensitivity but most luminescence molecules used to construct nanoprobes often suffer from an aggregation-caused quenching effect. Herein, we rationally designed a small molecular probe Cys(StBu)-Lys(Ru(bpy)32+)-CBT (1) which "smartly" self-assembled into nanoparticles 1-NPs inside cells with non-quenched, persistent phosphorescence. Employing this property, we successfully applied 1 for long-term sensing of biothiol activity in living HepG2 cells and tumors...
March 21, 2018: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/29558108/effects-of-nanoprobe-morphology-on-cellular-binding-and-inflammatory-responses-hyaluronan-conjugated-magnetic-nanoworms-for-magnetic-resonance-imaging-of-atherosclerotic-plaques
#19
Seyedmehdi Hossaini Nasr, Anne Tonson, Mohammad El-Dakdouki, David C Zhu, Dalen Agnew, Robert Wiseman, Chunqi Qian, Xuefei Huang
Atherosclerosis is an inflammatory disease of arterial walls and the rupturing of atherosclerotic plaques is a major cause of heart attack and stroke. Imaging techniques that can enable the detection of atherosclerosis plaques before clinical manifestation are urgently needed. Magnetic resonance imaging (MRI) is a powerful technique to image the morphology of atherosclerotic plaques. In order to better analyze molecular processes in plaques, contrast agents that can selectively bind to plaque receptors will prove invaluable...
March 20, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29556364/novel-self-assembled-organic-nanoprobe-for-molecular-imaging-and-treatment-of-gram-positive-bacterial-infection
#20
Tang Gao, Hongliang Zeng, Huan Xu, Feng Gao, Wei Li, Shengwang Zhang, Yi Liu, Guifang Luo, Mingdan Li, Dejian Jiang, Zhigao Chen, Yong Wu, Wei Wang, Wenbin Zeng
Background: Increasing bacterial infections as well as a rise in bacterial resistance call for the development of novel and safe antimicrobial agents without inducing bacterial resistance. Nanoparticles (NPs) present some advantages in treating bacterial infections and provide an alternative strategy to discover new antibiotics. Here, we report the development of novel self-assembled fluorescent organic nanoparticles ( FONs ) with excellent antibacterial efficacy and good biocompatibility. Methods: Self-assembly of 1-(12-(pyridin-1-ium-1-yl)dodecyl)-4-(1,4,5-triphenyl-1H-imidazol-2-yl)pyridin-1-ium (TPIP) in aqueous solution was investigated using dynamic light scattering (DLS) and transmission electron microscopy (TEM)...
2018: Theranostics
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