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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/29652130/in-vivo-targeted-responsive-and-synergistic-cancer-nanotheranostics-by-mri-guided-synergistic-hifu-ablation-and-chemotherapy
#2
Hailin Tang, Yuan Guo, Li Peng, Hui Fang, Zhigang Wang, Yuanyi Zheng, Haitao Ran, Yu Chen
As one of the most representative non-invasive therapeutic modalities, high-intensity focused ultrasound (HIFU) has shown the great promise for cancer therapy, but its low therapeutic efficacy and biosafety significantly hinder the further extensive clinical translation and application. In this work, we report on the construction of a multifunctional theranostic nanoplatform to synergistically enhance the HIFU-therapeutic efficacy based on nanomedicine. A targeted and temperature-responsive theranostic nanoplatform (PFH/DOX@PLGA/Fe3O4-FA) has been designed and fabricated for efficient ultrasound/magnetic resonance dual-modality imaging-guided HIFU/chemo synergistic therapy...
April 13, 2018: ACS Applied Materials & Interfaces
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
#3
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/29649747/polymeric-micelles-theranostic-co-delivery-system-for-poorly-water-soluble-drugs-and-contrast-agents
#4
Jaydev R Upponi, Kaushal Jerajani, Dattatri K Nagesha, Praveen Kulkarni, Srinivas Sridhar, Craig Ferris, Vladimir P Torchilin
Interest in theranostic agents has continued to grow because of their promise for simultaneous cancer detection and therapy. A platform-based nanosized combination agent suitable for the enhanced diagnosis and treatment of cancer was prepared using polymeric polyethylene glycol-phosphatidylethanolamine-based micelles loaded with both, poorly soluble chemotherapeutic agent paclitaxel and hydrophobic superparamagnetic iron oxide nanoparticles (SPION), a Magnetic Resonance Imaging contrast agent. The co-loaded paclitaxel and SPION did not affect each other's functional properties in vitro...
March 31, 2018: Biomaterials
https://www.readbyqxmd.com/read/29645299/orthogonal-clickable-iron-oxide-nanoparticle-platform-for-targeting-imaging-and-on-demand-release
#5
Noelia Guldris, Juan Gallo, Lorena García-Hevia, José Rivas, Manuel Bañobre-López, Laura M Salonen
A versatile iron oxide nanoparticle platform is reported, which can be orthogonally functionalized to obtain highly derivatized nanomaterials as required for a wide variety of applications such as drug delivery, targeted therapy, or imaging. The facile functionalization of the nanoparticles using two ligands with isocyanate moieties allows for high coverage of the surface with maleimide and alkyne groups. As a proof-of-principle, the nanoparticles were subsequently functionalized with a fluorophore as a drug model and with biotin as a targeting ligand towards tumor cells using Diels-Alder and azide-alkyne cycloaddition reactions, respectively...
April 12, 2018: Chemistry: a European Journal
https://www.readbyqxmd.com/read/29644335/neuromelanin-detection-by-magnetic-resonance-imaging-mri-and-its-promise-as-a-biomarker-for-parkinson-s-disease
#6
REVIEW
David Sulzer, Clifford Cassidy, Guillermo Horga, Un Jung Kang, Stanley Fahn, Luigi Casella, Gianni Pezzoli, Jason Langley, Xiaoping P Hu, Fabio A Zucca, Ioannis U Isaias, Luigi Zecca
The diagnosis of Parkinson's disease (PD) occurs after pathogenesis is advanced and many substantia nigra (SN) dopamine neurons have already died. Now that therapies to block this neuronal loss are under development, it is imperative that the disease be diagnosed at earlier stages and that the response to therapies is monitored. Recent studies suggest this can be accomplished by magnetic resonance imaging (MRI) detection of neuromelanin (NM), the characteristic pigment of SN dopaminergic, and locus coeruleus (LC) noradrenergic neurons...
2018: NPJ Parkinson's Disease
https://www.readbyqxmd.com/read/29643995/treatment-of-oral-cancer-using-magnetized-paclitaxel
#7
Rina Nakakaji, Masanari Umemura, Kenji Mitsudo, Jeong-Hwan Kim, Yujiro Hoshino, Itaru Sato, Takatsugu Masuda, Masahiro Yamamoto, Mitomu Kioi, Toshiyuki Koizumi, Takayuki Fujita, Utako Yokoyama, Masaki Iida, Motohiko Sato, Hiroshi Sato, Shoko Murofushi, Sayaka Shibata, Ichio Aoki, Haruki Eguchi, Iwai Tohnai, Yoshihiro Ishikawa
N,N'-Bis(salicylidene)ethylenediamine iron (Fe(Salen)) is an anti-cancer agent with intrinsic magnetic property. Here, we covalently linked Fe(Salen) to paclitaxel (PTX), a widely used anti-cancer drug, to obtain a magnetized paclitaxel conjugate (M-PTX), which exhibited magnetic characteristics for magnet-guided drug delivery and MRI visualization. M-PTX increased apoptosis and G2/M arrest of cultured human oral cancer cell lines in the same manner as PTX. Furthermore, marked contrast intensity was obtained in magnetic resonance imaging (MRI) of M-PTX...
March 20, 2018: Oncotarget
https://www.readbyqxmd.com/read/29643537/-preparation-and-characterization-of-citric-acid-modified-superparamagnetic-iron-oxide-nanoparticles
#8
H Wang, X Y Qin, Z Y Li, Z Z Zheng, T Y Fan
OBJECTIVE: To prepare and characterize citric acid (CA)-modified super paramagnetic iron oxide nanoparticles (SPIONs) for magnetic targeting, hyperthermia and magnetic resonance imaging (MRI). METHODS: CA-modified SPIONs (CA-SPIONs) were prepared by co-precipitation method and then the magnetic responsiveness, morphology, particle size, infrared feature, weight percentage of CA, magnetic property and X-ray diffraction pattern of CA-SPIONs were respectively characterized by magnet, transmission electron microscope, laser particle size analyzer, Fourier transform infrared (FT-IR) spectroscopy, thermogravimetry-differential thermal analyzer, vibrating sample magnetometer and X-ray diffractometer (XRD)...
April 18, 2018: Beijing da Xue Xue Bao. Yi Xue Ban, Journal of Peking University. Health Sciences
https://www.readbyqxmd.com/read/29643036/-quantitative-magnetic-resonance-imaging-of-brain-iron-deposition-comparison-between-quantitative-susceptibility-mapping-and-transverse-relaxation-rate-r2-mapping
#9
Ji-Jing Guan, Yan-Qiu Feng
OBJECTIVE: To evaluate the accuracy and sensitivity of quantitative susceptibility mapping (QSM) and transverse relaxation rate (R2*) mapping in the measurement of brain iron deposition. METHODS: Super paramagnetic iron oxide (SPIO) phantoms and mouse models of Parkinson's disease (PD) related to iron deposition in the substantia nigra (SN) underwent 7.0 T magnetic resonance (MR) scans (Bruker, 70/16) with a multi-echo 3D gradient echo sequence, and the acquired data were processed to obtain QSM and R2*...
March 20, 2018: Nan Fang Yi Ke da Xue Xue Bao, Journal of Southern Medical University
https://www.readbyqxmd.com/read/29626815/spectroscopic-and-photoacoustic-characterization-of-encapsulated-iron-oxide-super-paramagnetic-nanoparticles-as-a-new-multiplatform-contrast-agent
#10
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/29623644/intranasal-instillation-of-iron-oxide-nanoparticles-induces-inflammation-and-perturbation-of-trace-elements-and-neurotransmitters-but-not-behavioral-impairment-in-rats
#11
Dalel Askri, Souhir Ouni, Said Galai, Josiane Arnaud, Benoit Chovelon, Sylvia G Lehmann, Nathalie Sturm, Mohsen Sakly, Michel Sève, Salem Amara
Over the last decades, engineered nanomaterials have been widely used in various applications due to their interesting properties. Among them, iron oxide nanoparticles (IONPs) are used as theranostic agents for cancer, and also as contrast agents in magnetic resonance imaging. With the increasing production and use of these IONPs, there is an evident raise of IONP exposure and subsequently a higher risk of adverse outcome for humans and the environment. In this work, we aimed to investigate the effects of sub-acute IONP exposure on Wistar rat, particularly (i) on the emotional and learning/memory behavior, (ii) on the hematological and biochemical parameters, (iii) on the neurotransmitter content, and (vi) on the trace element homeostasis...
April 5, 2018: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/29620535/vsion-as-high-field-mri-t1-contrast-agent-evidence-of-their-potential-as-positive-contrast-agent-for-magnetic-resonance-angiography
#12
Thomas Vangijzegem, Dimitri Stanicki, Sébastien Boutry, Quentin Paternoster, Luce Vander Elst, Robert Nathan Muller, Sophie Laurent
Because of their outstanding magnetic properties, iron oxide nanoparticles have already been 
 the subject of numerous studies in the biomedical field, in particular as negative contrast agent 
 for T2-weighted nuclear magnetic resonance imaging, or as therapeutic agents for hyperthermia 
 experiments. Recent studies have shown that below a given size (i.e. 5 nm), iron oxide may be 
 used to exhibit a significant positive (brightening) effect on T1-weighted MRI. When focusing 
 on such application, not only the size of the crystal, but also the control of the coating process 
 is essential to ensure optimal properties, especially at very high field (> 3T)...
April 5, 2018: Nanotechnology
https://www.readbyqxmd.com/read/29620288/differentiation-of-genetically-modified-canine-bone-mesenchymal-stem-cells-labeled-with-superparamagnetic-iron-oxide-into-neural%C3%A2-like-cells
#13
Xing-Long Liu, Qing-Quan Zu, Bin Wang, Shan-Shan Lu, Xiao-Quan Xu, Sheng Liu, Hai-Bin Shi
The use of mesenchymal stem cells (MSCs) has been reported to improve outcomes in various types of nervous system diseases, primarily based on their neural regenerative differentiation ability and paracrine effect on different neuroprotective cytokines. Genetically modified MSCs may enhance the paracrine effect and may further improve the cell‑based therapeutic outcome of nervous system diseases. Magnetic resonance imaging has been used to monitor distribution and migration of cells labeled with superparamagnetic iron oxide (SPIO) nanoparticles...
April 5, 2018: Molecular Medicine Reports
https://www.readbyqxmd.com/read/29619158/a-pilot-trial-of-deferiprone-in-pantothenate-kinase-associated-neurodegeneration-patients
#14
Mohammad Rohani, Saeed Razmeh, Gholam Ali Shahidi, Elham Alizadeh, Maryam Orooji
Pantothenate kinase-associated neurodegeneration (PKAN) is the most common form of neurodegeneration with brain iron accumulation, it is an autosomal recessive disease due to mutation in PANK 2 on chromosome 20, which causes the accumulation of iron in basal ganglia and production of free radicals that cause degeneration of the cells. Deferiprone is an iron chelator that was used in treatment of thalassemia patients, it can cross the blood-brain barrier and reverse the iron deposition in the brain. Five patients with genetically confirmed PKAN received 15 mg/kg deferiprone twice daily...
December 11, 2017: Neurology International
https://www.readbyqxmd.com/read/29608568/dual-modal-photoacoustic-and-magnetic-resonance-tracking-of-tendon-stem-cells-with-plga-iron-oxide-microparticles-in-vitro
#15
Man Lu, Xueqing Cheng, Jingzhen Jiang, TingTing Li, Zhenqi Zhang, Chialing Tsauo, Yin Liu, Zhigang Wang
Reliable cell tracking is essential to understand the fate of stem cells following implantation, and thus promote the clinical application of stem cell therapy. Dual or multiple modal imaging modalities mediated by different types of multifunctional contrast agent are generally needed for efficient cell tracking. Here, we created a new contrast agent-PLGA/iron oxide microparticles (PLGA/IO MPs) and characterized the morphology, structure and function of enhancing both photoacoustic (PA) and magnetic resonance imaging (MRI)...
2018: PloS One
https://www.readbyqxmd.com/read/29604440/nanoaggregates-of-iron-poly-oxo-clusters-obtained-by-laser-ablation-in-aqueous-solution-of-phosphonates
#16
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/29593411/imaging-of-extracellular-vesicles-derived-from-human-bone-marrow-mesenchymal-stem-cells-using-fluorescent-and-magnetic-labels
#17
Sylwia Dabrowska, Andrea Del Fattore, Elzbieta Karnas, Malgorzata Frontczak-Baniewicz, Hanna Kozlowska, Maurizio Muraca, Miroslaw Janowski, Barbara Lukomska
Background: Mesenchymal stem cells have been shown therapeutic in various neurological disorders. Recent studies support the notion that the predominant mechanism by which MSCs act is through the release of extracellular vesicles (EVs). EVs seem to have similar therapeutic activity as their cellular counterparts and may represent an interesting alternative standalone therapy for various diseases. The aim of the study was to optimize the method of EV imaging to better understand therapeutic effects mediated by EVs...
2018: International Journal of Nanomedicine
https://www.readbyqxmd.com/read/29588229/microstructural-imaging-of-human-neocortex-in-vivo
#18
Luke J Edwards, Evgeniya Kirilina, Siawoosh Mohammadi, Nikolaus Weiskopf
The neocortex of the human brain is the seat of higher brain function. Modern imaging techniques, chief among them magnetic resonance imaging (MRI), allow non-invasive imaging of this important structure. Knowledge of the microstructure of the neocortex has classically come from post-mortem histological studies of human tissue, and extrapolations from invasive animal studies. From these studies, we know that the scale of important neocortical structure spans six orders of magnitude, ranging from the size of axonal diameters (microns), to the size of cortical areas responsible for integrating sensory information (centimetres)...
March 24, 2018: NeuroImage
https://www.readbyqxmd.com/read/29577976/effects-of-iron-oxide-contrast-agent-in-combination-with-various-transfection-agents-during-mesenchymal-stem-cells-labelling-an-in-vitro-toxicological-evaluation
#19
Sushanta Kumar Mishra, Subash Khushu, Gurudutta Gangenahalli
The use of iron oxide nanoparticles for different biomedical applications, hold immense promise to develop negative tissue contrast in magnetic resonance imaging (MRI). Previously, we have optimized the labelling of mesenchymal stem cells (MSCs) with iron oxide nanoparticles complexed to different transfection agents like poly-l-lysine (IO-PLL) and protamine sulfate (Fe-Pro) on the basis of relaxation behaviour and its biological expressions. However, there is a distinct need to investigate the biocompatibility and biosafety concerns coupled with its cytotoxicity and genotoxicity...
March 22, 2018: Toxicology in Vitro: An International Journal Published in Association with BIBRA
https://www.readbyqxmd.com/read/29577015/multifunctional-pegylated-albumin-ir780-iron-oxide-nanocomplexes-for-cancer-photothermal-therapy-and-mr-imaging
#20
Ssu-Yu Lin, Rih-Yang Huang, Wei-Chen Liao, Chun-Chiao Chuang, Chien-Wen Chang
A multifunctional albumin/superparamagnetic iron oxide nanoparticle (SPIO) nanocomplex system to deliver IR780, a photothermal agent, for cancer theranostic applications was proposed in this study. Single emulsion method was utilized to fabricate the human albumin/IR780/SPIO (HISP) nanocomplexes with a hydrophobic core (SPIO and IR780) and a hydrophilic shell (human serum albumin (HSA) and poly (ethylene glycol) (PEG)). Effects of PEGylation on the size and surface potential of nanocomplexes were analyzed. Nanospheres containing uniformly dispersed SPIO was observed using Transmission Electron Microscopy (TEM) imaging...
2018: Nanotheranostics
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