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https://www.readbyqxmd.com/read/28088668/near-infrared-light-triggered-drug-delivery-system-for-higher-efficacy-of-combined-chemo-photothermal-treatment
#1
Yi Chen, Haohuan Li, Yueyang Deng, Haifeng Sun, Xue Ke, Tianyuan Ci
: The combination of chemotherapy and photothermal therapy is a promising strategy for cancer treatment. In the present study, indocyanine green (ICG), a widely used near-infrared (NIR) dye in photothermal therapy, and chemotherapeutic drug-doxorubicin (DOX) were loaded within the nanoparticles of novel designed arylboronic ester and cholesterol modified hyaluronic acid (PPE-Chol1-HA), denoted as PCH-DI. We take advantage of reactive oxygen species (ROS) production capability of ICG and ROS-sensitivity of arylboronic ester to realize controllable drug release...
January 11, 2017: Acta Biomaterialia
https://www.readbyqxmd.com/read/28088632/nanosized-complexation-assemblies-housed-inside-reverse-micelles-churn-out-monocytic-delivery-cores-for-bendamustine-hydrochloride
#2
Yuvraj Singh, Anumandla Chandrashekhar, Jaya Gopal Meher, K K Durga Rao Viswanadham, Vivek K Pawar, Kavit Raval, Komal Sharma, Pankaj K Singh, Animesh Kumar, Manish K Chourasia
OBJECTIVE: We explore a plausible method of targeting bendamustine hydrochloride (BM) to circulatory monocytes by exploiting their intrinsic endocytic/phagocytic capability. METHODS: We do so by complexation of sodium alginate and chitosan inside dioctyl sulfo succinate sodium (AOT) reverse micelles to form bendamustine hydrochloride loaded nanoparticles (CANPs). Dynamic light scattering, electrophoretic mobility and UV spectroscopy were used to detail intra-micellar complexation dynamics and to prove that drug was co-captured during interaction of carbohydrate polymers...
January 11, 2017: European Journal of Pharmaceutics and Biopharmaceutics
https://www.readbyqxmd.com/read/28088566/removal-of-salicylic-acid-as-an-emerging-contaminant-by-a-polar-nano-dendritic-adsorbent-from-aqueous-media
#3
M Arshadi, F Mousavinia, M K Abdolmaleki, M J Amiri, A Khalafi-Nezhad
A polar nano-dendritic adsorbent containing amine groups (SAPAMAA) was synthesized onto the nanoparticles of SiO2Al2O3 and its uptake of salicylic acid (SA) from the synthetic and real water was investigated. The synthesized nanomaterials were fully studied by nuclear magnetic resonance spectrum ((1)H NMR and (13)C NMR), Fourier transform infrared spectroscopy (FT-IR), zeta potential (ζ), inductively coupled plasma atomic emission spectroscopy (ICP-AES), scanning electron microscopy (SEM), transmission electron microscopy (TEM), Brunauer-Emmett-Teller (BET) and elemental analysis...
January 9, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28088081/lead-pb-2-and-copper-cu-2-remediation-from-water-using-superparamagnetic-maghemite-%C3%AE-fe2o3-nanoparticles-synthesized-by-flame-spray-pyrolysis-fsp
#4
Shalini Rajput, Lok P Singh, Charles U Pittman, Dinesh Mohan
Superparamagnetic maghemite (γ-Fe2O3) nanoparticles of controllable morphology were successfully synthesized using a flame spray pyrolysis (FSP) technique. Their physico-chemical properties, size, morphology, and surface chemistries were determined using X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), transmission electron microscopy (TEM), selected area electron diffraction patterns (SAED), SEM-EDX, scanning electron microscopy (SEM), and pHZPC(6.3). Elemental contents before and after adsorption were identified using energy dispersive X-ray fluorescence (ED-XRF), energy dispersive X-ray analysis (EDX) and elemental mapping...
November 27, 2016: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28087485/stepwise-targeted-drug-delivery-to-liver-cancer-cells-for-enhanced-therapeutic-efficacy-by-galactose-grafted-ultra-ph-sensitive-micelles
#5
Guoqing Yan, Jun Wang, Liefeng Hu, Xin Wang, Guanqing Yang, Shengxiang Fu, Xu Cheng, Panpan Zhang, Rupei Tang
: To promote drug accumulation and cell-killing ability at tumor tissue, we have prepared a stepwise targeted drug delivery system that can remain stealthy and long-circulating in the blood vessels, improve drug retention at extracellular stimuli, enhance cellular uptake through special targeting ligands, and then achieve rapid drug release to improve toxicity to tumor cells at intracellular stimuli. Herein, galactose-grafted, ultra-pH-sensitive drug carriers (POEAd-g-LA-DOX micelles), which could respond to both extracellular and intracellular pH, and combine with galactose-receptors in cell membrane, were constructed by a facile method, therefore achieving: (i) remaining stable at pH 7...
January 10, 2017: Acta Biomaterialia
https://www.readbyqxmd.com/read/28087479/synthesis-and-characterization-of-gold-nanostructured-chorin-e6-for-photodynamic-therapy
#6
L Vieira, M L Castilho, I Ferreira, J Ferreira-Strixino, K C Hewitt, L Raniero
Photodynamic therapy is an alternative treatment for cancer based on cellular uptake of a photosensitizer, illuminated with an appropriate wavelength in the presence of oxygen. A cascade of reactions generates reactive oxygen species leading to cell death. Using carbodiimide chemistry, chlorin e6 (Ce6) was covalently bonded to thiourea, and (via the sulphur end group) to gold nanoparticles (AuNPs), forming the Ce6-AuNP complex. Ce6 absorbs in the range 650-680nm, where the coefficient of biological tissue absorption is low (part of the therapeutic window), which is ideal for biological application...
January 10, 2017: Photodiagnosis and Photodynamic Therapy
https://www.readbyqxmd.com/read/28087384/epidermal-growth-factor-egf-fragment-guided-anticancer-theranostic-particles-for-ph-responsive-release-of-doxorubicin
#7
Myun Koo Kang, Wei Mao, Jun Bae Lee, Hyuk Sang Yoo
An EGF fragment and doxorubicin were chemically co-decorated on single magnetic nanoparticles for concomitant cancer targeting and treatment. Magnetic nanoparticles (MNPs) were prepared by the precipitation of ferric chloride hydrates in an ammonia solution and subsequent surface-functionalization with amines. The terminal thiol group of the EGF fragment (EGFfr) was first conjugated to surface amines of the MNPs using a heterofunctional crosslinker, and doxorubicin was sequentially conjugated to the MNPs via a hydrazone linker, where the degree of substation of the surface amines to EGF was varied from 1% to 40%...
January 10, 2017: International Journal of Pharmaceutics
https://www.readbyqxmd.com/read/28081462/in%C3%A2-vitro-evaluation-of-biodegradable-lignin-based-nanoparticles-for-drug-delivery-and-enhanced-antiproliferation-effect-in-cancer-cells
#8
Patrícia Figueiredo, Kalle Lintinen, Alexandros Kiriazis, Ville Hynninen, Zehua Liu, Tomás Bauleth-Ramos, Antti Rahikkala, Alexandra Correia, Tomáš Kohout, Bruno Sarmento, Jari Yli-Kauhaluoma, Jouni Hirvonen, Olli Ikkala, Mauri A Kostiainen, Hélder A Santos
Currently, nanosystems have been developed and applied as promising vehicles for different biomedical applications. We have developed three lignin nanoparticles (LNPs): pure lignin nanoparticles (pLNPs), iron(III)-complexed lignin nanoparticles (Fe-LNPs), and Fe3O4-infused lignin nanoparticles (Fe3O4-LNPs) with round shape, narrow size distribution, reduced polydispersity and good stability at pH 7.4. The LNPs showed low cytotoxicity in all the tested cell lines and hemolytic rates below 12% after 12 h of incubation...
January 2, 2017: Biomaterials
https://www.readbyqxmd.com/read/28081364/relative-contributions-of-copper-oxide-nanoparticles-and-dissolved-copper-to-cu-uptake-kinetics-of-gulf-killifish-fundulus-grandis-embryos
#9
Chuanjia Jiang, Benjamin T Castellon, Cole W Matson, George R Aiken, Heileen Hsu-Kim
The toxicity of soluble metal-based nanomaterials may be due to the uptake of metals in both dissolved and nanoparticulate forms, but the relative contributions of these different forms to overall metal uptake rates under environmental conditions are not quantitatively defined. Here we investigated the linkage between the dissolution rates of copper(II) oxide (CuO) nanoparticles (NPs) and their bioavailability to Gulf killifish (Fundulus grandis) embryos, with the aim of quantitatively delineating the relative contributions of nanoparticulate and dissolved species for Cu uptake...
January 12, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28080251/tetrahedral-dna-nanoparticle-vector-for-intracellular-delivery-of-targeted-peptide-nucleic-acid-antisense-agents-to-restore-antibiotic-sensitivity-in-cefotaxime-resistant-escherichia-coli
#10
John Benedict Readman, George Dickson, Nick G Coldham
The bacterial cell wall presents a barrier to the uptake of unmodified synthetic antisense oligonucleotides, such as peptide nucleic acids, and so is one of the greatest obstacles to the development of their use as therapeutic anti-bacterial agents. Cell-penetrating peptides have been covalently attached to antisense agents, to facilitate penetration of the bacterial cell wall and deliver their cargo into the cytoplasm. Although they are an effective vector for antisense oligonucleotides, they are not specific for bacterial cells and can exhibit growth inhibitory properties at higher doses...
January 12, 2017: Nucleic Acid Therapeutics
https://www.readbyqxmd.com/read/28078967/the-glycocalyx-regulates-the-uptake-of-nanoparticles-by-human-endothelial-cells-in-vitro
#11
Leonhard Möckl, Stephanie Hirn, Adriano A Torrano, Bernd Uhl, Christoph Bräuchle, Fritz Krombach
AIM: To assess the role of the endothelial glycocalyx (eGCX) for the uptake of nanoparticles by endothelial cells. METHODS: The expression of the eGCX on cultured human umbilical vein endothelial cells was determined by immunostaining of heparan sulfate. Enzymatic degradation of the eGCX was achieved by incubating the cells with eGCX-shedding enzymes. The uptake of 50-nm polystyrene nanospheres was quantified by confocal microscopy. RESULTS: Human umbilical vein endothelial cells expressed a robust eGCX when cultured for 10 days...
January 12, 2017: Nanomedicine
https://www.readbyqxmd.com/read/28071883/individually-stabilized-superparamagnetic-nanoparticles-with-controlled-shell-and-size-leading-to-exceptional-stealth-properties-and-high-relaxivities
#12
Andrea Lassenberger, Andrea Scheberl, Andreas Stadlbauer, Alexander Stiglbauer, Thomas Helbich, Erik Reimhult
Superparamagnetic iron oxide nanoparticles (SPION) have received immense interest for biomedical applications, with the earliest first clinical application as negative constrast agent in being for magnetic resonance imaging (MRI). However, the first generation MRI contrast agents with dextran-enwrapped, polydisperse, iron oxide nanoparticle clusters are limited to imaging of liver and spleen; this is related to their poor colloidal stability in biological media and inability to evade clearance by the reticuloendothelial system...
January 10, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28071140/development-and-characterization-of-polymer-lipid-hybrid-nanoparticles-for-oral-delivery-of-lmwh
#13
Supandeep Singh Hallan, Veerpal Kaur, Vikas Jain, Neeraj Mishra
The present study aimed to develop an improved oral delivery system for low-molecular-weight heparin (LMWH), novel polymer lipid hybrid nanoparticles were developed. LMWH loaded chitosan polymer lipid hybrid nanoparticles (LMWH-CS-PLNs) were developed using double emulsification and solvent evaporation method. The performance of developed formulations was evaluated by using in vitro and in vivo behavior, such as drug release studies, in vitro permeation study, in vivo venous thrombolytic study, in vitro uptake studies by using intestinal epithelium resembling Caco-2 cell lines...
January 10, 2017: Artificial Cells, Nanomedicine, and Biotechnology
https://www.readbyqxmd.com/read/28069300/response-of-microbial-communities-colonizing-salt-marsh-plants-rhizosphere-to-copper-oxide-nanoparticles-contamination-and-its-implications-for-phytoremediation-processes
#14
Joana P Fernandes, C Marisa R Almeida, Federico Andreotti, Leandro Barros, Tânia Almeida, Ana P Mucha
This study aimed to investigate Cu oxide nanoparticles (CuO NP) effect on microbial communities associated with salt marsh plants (Halimione portulacoides and Pragmites australis) rhizosphere and its implications for phytoremediation processes. Experiments were conducted, under controlled conditions, over one week. Rhizosediment soaked in the respective elutriate (a simplified natural medium) with or without plants, was doped with CuO NP or with Cu in ionic form. Microbial community in rhizosediments was characterized in terms of abundance (by DAPI) and structure (by ARISA)...
January 7, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28069025/interaction-of-biomedical-nanoparticles-with-the-pulmonary-immune-system
#15
REVIEW
Fabian Blank, Kleanthis Fytianos, Emilie Seydoux, Laura Rodriguez-Lorenzo, Alke Petri-Fink, Christophe von Garnier, Barbara Rothen-Rutishauser
Engineered nanoparticles (NPs) offer site-specific delivery, deposition and cellular uptake due to their unique physicochemical properties and were shown to modulate immune responses. The respiratory tract with its vast surface area is an attractive target organ for innovative immunomodulatory therapeutic applications by pulmonary administration of such NPs, enabling interactions with resident antigen-presenting cells (APCs), such as dendritic cells and macrophages. Depending on the respiratory tract compartment, e...
January 9, 2017: Journal of Nanobiotechnology
https://www.readbyqxmd.com/read/28067486/photocrosslinkable-polymer-dots-with-stable-sensitizer-loading-and-amplified-singlet-oxygen-generation-for-photodynamic-therapy
#16
Ying Tang, Haobin Chen, Kaiwen Chang, Zhihe Liu, Yu Wang, Songnan Qu, Hong Xu, Changfeng Wu
Photodynamic therapy (PDT) is a promising treatment modality for clinical cancer therapy. However, the therapeutic effect of PDT is strongly dependent on the property of photosensitizer. Here, we developed photocrosslinkable semiconductor polymer dots doped with photosensitizer Chlorin e6 (Ce6) to construct a nanoparticle platform for photodynamic therapy. Photo-reactive oxetane groups were attached to the side chains of the semiconductor polymer. After photocrosslinking reaction, the Ce6-doped Pdots formed an interpenetrated structure to prevent Ce6 leaching out from the Pdot matrix...
January 9, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28067342/a-soluble-conjugated-porous-organic-polymer-efficient-white-light-emission-in-solution-nanoparticles-gel-and-transparent-thin-film
#17
Pragyan Pallavi, Sujoy Bandyopadhyay, Jesna Louis, Arundhati Deshmukh, Abhijit Patra
A tetraphenylcyclopentadiene based multifunctional, solution processable, fluorescent, ultramicroporous polymer exhibiting high hydrogen uptake was employed for encapsulation of dyes to obtain enhanced white light emission in solution, nanoparticles, gel and transparent thin film. Hybrid nanoparticles showed a quantum yield of 35% with a high color rendering index.
January 9, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28067319/c-elegans-on-a-chip-for-in-situ-and-in-vivo-ag-nanoparticles-uptake-and-toxicity-assay
#18
Jin Ho Kim, Seung Hwan Lee, Yun Jeong Cha, Sung Jin Hong, Sang Kug Chung, Tai Hyun Park, Shin Sik Choi
Nanomaterials are extensively used in consumer products and medical applications, but little is known about their environmental and biological toxicities. Moreover, the toxicity analysis requires sophisticated instruments and labor-intensive experiments. Here we report a microfluidic chip incorporated with the nematode Caenorhabditis elegans that rapidly displays the changes in body growth and gene expression specifically responsive to the silver nanoparticles (AgNPs). C. elegans were cultured in microfluidic chambers in the presence or absence of AgNPs and were consequently transferred to wedge-shaped channels, which immobilized the animals, allowing the evaluation of parameters such as length, moving distance, and fluorescence from the reporter gene...
January 9, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28066811/ph-dependent-cellular-internalization-of-paramagnetic-nanoparticle
#19
Branislava Janic, Mohammed Pi Bhuiyan, James R Ewing, Meser M Ali
A hallmark of the tumor microenvironment in malignant tumor is extracellular acidosis, which can be exploited for targeted delivery of drugs and imaging agents. A pH sensitive paramagnetic nanoaparticle (NP) is developed by incorporating GdDOTA-4AmP MRI contrast agent and pHLIP (pH Low Insertion Peptide) into the surface of a G5-PAMAM dendrimer. pHLIP showed pH-selective insertion and folding into cell membranes, but only in acidic conditions. We demonstrated that pHLIP-conjugated Gd44-G5 paramagnetic nanoparticle binds and fuses with cellular membrane at low pH, but not at normal physiological pH, and that it promotes cellular uptake...
August 26, 2016: ACS Sensors
https://www.readbyqxmd.com/read/28065871/targeted-glioma-chemotherapy-by-cyclic-rgd-peptide-functionalized-reversibly-core-crosslinked-multifunctional-poly-ethylene-glycol-b-poly-%C3%AE%C2%B5-caprolactone-micelles
#20
Ya Fang, Yu Jiang, Yan Zou, Fenghua Meng, Jian Zhang, Chao Deng, Huanli Sun, Zhiyuan Zhong
: Cyclic RGD peptide-functionalized reversibly core-crosslinked biodegradable poly(ethylene glycol)-b-poly(ε-caprolactone) (PEG-PCL) micelles (cRGD-RCCMs) were designed and developed for highly potent and targeted glioma chemotherapy. To achieve crosslinkable core, dithiolane-functionalized trimethylene carbonate (DTC) was incorporated into PCL block. Interestingly, cRGD-RCCMs displayed a high doxorubicin (DOX) loading content of ∼18 wt.%, small hydrodynamic size of ∼50 nm, and excellent colloidal stability with minimum drug leakage under physiological conditions whilst fast DOX release under cytoplasmic-mimicking reductive environments...
January 5, 2017: Acta Biomaterialia
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