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https://www.readbyqxmd.com/read/29168850/a-tellurylsulfide-bond-containing-redox-responsive-superparamagnetic-nanogel-with-acid-responsiveness-for-efficient-anticancer-therapy
#1
Xiaoyang Xia, Xia Xiang, Fenghong Huang, Zhen Zhang, Ling Han
A tellurylsulfide bond-containing biopolymer nanogel was first fabricated to achieve smart drug release. The reductive nanogel exhibited highly sensitive reduction-responsiveness, fast internalization, and efficient anticancer therapy. This approach displays a new potential of tellurylsulfide bond-containing nanocarriers for drug delivery.
November 23, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/29154878/nanogel-based-natural-polymers-as-smart-carriers-for-the-controlled-delivery-of-timolol-maleate-through-the-cornea-for-glaucoma
#2
Roya Ilka, Mojdeh Mohseni, Mehran Kianirad, Masood Naseripour, Khadijeh Ashtari, Bita Mehravi
Despite frequent scientific efforts, efficient ocular drug delivery is a major challenge for pharmaceutical scientists. Poor bioavailability of ophthalmic solutions can be overcome by using smart ophthalmic drug-delivery systems. In this research, loading and delivery of Timolol Maleate (TM) through the cornea by synthesized nanoparticles based on biopolymers (chitosan-alginate) were studied. The physico-chemical properties of these nanoparticles were characterized using scanning electron microscopy (SEM), transmission electron microscopy (TEM) and dynamic light scattering (DLS)...
November 14, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/29147499/nano-microvehicles-for-efficient-delivery-and-bio-sensing-at-the-cellular-level
#3
S Campuzano, B Esteban-Fernández de Ávila, P Yáñez-Sedeño, J M Pingarrón, J Wang
A perspective review of recent strategies involving the use of nano/microvehicles to address the key challenges associated with delivery and (bio)sensing at the cellular level is presented. The main types and characteristics of the different nano/microvehicles used for these cellular applications are discussed, including fabrication pathways, propulsion (catalytic, magnetic, acoustic or biological) and navigation strategies, and relevant parameters affecting their propulsion performance and sensing and delivery capabilities...
October 1, 2017: Chemical Science
https://www.readbyqxmd.com/read/29144411/nucleic-acid-aptamers-emerging-applications-in-medical-imaging-nanotechnology-neurosciences-and-drug-delivery
#4
REVIEW
Pascal Röthlisberger, Cécile Gasse, Marcel Hollenstein
Recent progresses in organic chemistry and molecular biology have allowed the emergence of numerous new applications of nucleic acids that markedly deviate from their natural functions. Particularly, DNA and RNA molecules-coined aptamers-can be brought to bind to specific targets with high affinity and selectivity. While aptamers are mainly applied as biosensors, diagnostic agents, tools in proteomics and biotechnology, and as targeted therapeutics, these chemical antibodies slowly begin to be used in other fields...
November 16, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/29136373/photocontrol-of-antibacterial-activity-shifting-from-uv-to-red-light-activation
#5
Michael Wegener, Mickel J Hansen, Arnold J M Driessen, Wiktor Szymanski, Ben L Feringa
The field of photopharmacology aims to introduce smart drugs that, through the incorporation of molecular photoswitches, allow for the remote spatial and temporal control of bioactivity by light. This concept could be particularly beneficial in the treatment of bacterial infections, by reducing the systemic and environmental side-effects of antibiotics. A major concern in the realization of such light-responsive drugs is the wavelength of the light that is applied. Studies on the photocontrol of biologically active agents mostly rely on UV light, which is cytotoxic and poorly suited for tissue penetration...
November 14, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/29132238/nanomicelle-drug-with-acid-triggered-doxorubicin-release-and-enhanced-cellular-uptake-ability-based-on-mpeg-graft-poly-n-2-aminoethyl-l-aspartamide-hexahydrophthalic-acid-copolymers
#6
Li Cao, Yi Xiao, Wei Lu, Shiyuan Liu, Lin Gan, Jiahui Yu, Jin Huang
In order to achieve the passive tumor targeting and acid-triggered drugs release in lysosomes, optimized delivery system for doxorubicin based on pH-sensitive complex nanomicelles with suitable particle size was developed in this research. Particularly, poly(L-succinimide) was thoroughly ring-opened by ethylenediamine to give the poly(N-(2-aminoethyl)-L-aspartamide). Then, graft copolymer mPEG-graft-poly(N-(2-aminoethyl)-L-aspartamide)-hexahydrophthalic acid (mPEG-g-P(ae-Asp)-Hap) was synthesized by grafting mPEG-2000 and hexahydrophthalic anhydride onto poly(N-(2-aminoethyl)-L-aspartamide)...
January 1, 2017: Journal of Biomaterials Applications
https://www.readbyqxmd.com/read/29130888/co-delivery-of-cisplatin-and-cjm-126-via-photothermal-conversion-nanoparticles-for-enhanced-synergistic-antitumor-efficacy
#7
Chaoqun You, Hongshuai Wu, Mingxin Wang, Zhiguo Gao, Xiangyang Zhang, Baiwang Sun
Polymeric biomaterials that can be smartly disassembled through the cleavage of the covalent bonds in a controllable method upon an environmental stimuli such as pH change, redox, special enzymes, temperature, ultrasound as well as light irradiation but otherwise are stable under physiological condition has attracted great attention in past decades. In our study, a novel NIR-responsive targeted binary-drug loaded nanoparticles encapsulating ICG dye was prepared as a new co-delivery and combined therapy vehicle...
November 13, 2017: Nanotechnology
https://www.readbyqxmd.com/read/29127937/reduction-sensitive-mixed-micelles-assembled-from-amphiphilic-prodrugs-for-self-codelivery-of-dox-and-dtx-with-synergistic-cancer-therapy
#8
Jilian Wu, Huiyuan Zhang, Xu Hu, Ruiling Liu, Wei Jiang, Zhonghao Li, Yuxia Luan
Clinically, codelivery of chemotherapeutics has been limited by poor water-solubility and severe systemic toxicity. In this work, we developed a new reduction-sensitive mixed micellar system for self-codelivery of doxorubicin (DOX) and docetaxel (DTX). Biodegradable methoxy poly(ethylene glycol)-poly(ε-caprolactone) (mPEG-PCL) was coupled with DOX and DTX by a reduction-sensitive disulfide bond, resulting in mPEG-PCL-SS-DOX and mPEG-PCL-SS-DTX, respectively. mPEG-PCL-SS-DOX was mixed with mPEG-PCL-SS-DTX at a mole ratio of 1:1 in water, forming a mixed micellar system...
November 6, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/29127486/crosstalk-of-nanosystems-induced-extracellular-vesicles-as-promising-tools-in-biomedical-applications
#9
REVIEW
Gamaleldin I Harisa, Mohamed M Badran, Fars K Alanazi, Sabry M Attia
Hybrid vesicles are considered as a bridge between natural nanosystems (NNSs) and artificial nanosystems (ANSs). NNSs are extracellular vesicles (EVs), membranous, bio-formed endogenously, which act as endogenous cargoes, and reflecting cellular dynamics. EVs have cellular tropism, permeate tight junctions, and are non-immunogenic. EVs are used as tools in the development of diagnostic and therapeutic agents. ANSs can induce biogenesis of hybrid vesicles as promising smart diagnostic agents, and innovative drug cargoes...
November 10, 2017: Journal of Membrane Biology
https://www.readbyqxmd.com/read/29127069/lectin-conjugated-ph-responsive-mesoporous-silica-nanoparticles-for-targeted-bone-cancer-treatment
#10
Marina Martínez-Carmona, Daniel Lozano, Montserrat Colilla, María Vallet-Regí
A novel multifunctional nanodevice based in doxorubicin (DOX)-loaded mesoporous silica nanoparticles (MSNs) as nanoplatforms for the assembly of different building blocks has been developed for bone cancer treatment. These building blocks consists of: i) a polyacrylic acid (PAA) capping layer grafted to MSNs via an acid-cleavable acetal linker, to minimize premature cargo release and provide the nanosystem of pH-responsive drug delivery ability; and ii) a targeting ligand, the plant lectin concanavalin A (ConA), able to selectively recognize, bind and internalize owing to certain cell-surface glycans, such as sialic acids (SA), overexpressed in given tumor cells...
November 7, 2017: Acta Biomaterialia
https://www.readbyqxmd.com/read/29098882/ph-and-thermo-sensitive-mtx-loaded-magnetic-nanocomposites-synthesis-characterization-and-in-vitro-studies-on-a549-lung-cancer-cell-and-mr-imaging
#11
Masoud Farshbaf, Roya Salehi, Nasim Annabi, Rovshan Khalilov, Abolfazl Akbarzadeh, Soodabeh Davaran
In current study we proposed a facile method for fabrication of multifunctional pH- and thermo sensitive magnetic nanocamposites (MNCs) as a theranostic agent employing in targeted drug delivery and magnetic resonance imaging (MRI). To this end, we decorated Fe3O4 magnetic nanoparticles (MNPs) with N,N-dimethylaminoethyl methacrylate (DMAEMA) and N-isopropylacrylamide (NIPAAm), best known for their pH- and thermo sensitive properties, respectively. We also conjugated mesoporous silica nanoparticles (MSNs) to polymer matrix acting as drug container to enhance the drug encapsulation efficacy...
November 3, 2017: Drug Development and Industrial Pharmacy
https://www.readbyqxmd.com/read/29098325/neurotrophin-conjugated-nanoparticles-prevent-retina-damage-induced-by-oxidative-stress
#12
Martina Giannaccini, Alice Usai, Federica Chiellini, Viviana Guadagni, Massimiliano Andreazzoli, Michela Ori, Massimo Pasqualetti, Luciana Dente, Vittoria Raffa
Glaucoma and other optic neuropathies are characterized by a loss of retinal ganglion cells (RGCs), a cell layer located in the posterior eye segment. Several preclinical studies demonstrate that neurotrophins (NTs) prevent RGC loss. However, NTs are rarely investigated in the clinic due to various issues, such as difficulties in reaching the retina, the very short half-life of NTs, and the need for multiple injections. We demonstrate that NTs can be conjugated to magnetic nanoparticles (MNPs), which act as smart drug carriers...
November 2, 2017: Cellular and Molecular Life Sciences: CMLS
https://www.readbyqxmd.com/read/29090672/an-overview-on-applications-of-gold-nanoparticle-for-early-diagnosis-and-targeted-drug-delivery-to-prostate-cancer
#13
Ravi Shankaran Dhesingh, S Thambiraj, S Hema
BACKGROUND: Carcinoma of the prostate gland (PCa) is one of the most commonly diagnosed cancer diseases among men around the world. PCa has become the major considerable health and epidemic problem which causes death in men with a high prevalence and relatively lower mortality risk. The inability of conventional diagnosis tools to detect cancer at an early and potentially curable stage further hinders effective treatment options and spur demand for improved technologies. Nanoparticles are emerging as a versatile tool for disease diagnosis to therapy...
November 1, 2017: Recent Patents on Nanotechnology
https://www.readbyqxmd.com/read/29073792/alendronate-loaded-biodegradable-smart-hydrogel-a-promising-injectable-depot-formulation-for-osteoporosis
#14
Noha Nafee, Mariam Zewail, Nabila Boraie
Alendronate (ALN) is a BCS III bone resorption inhibitor, with very poor oral bioavailability. Our approach is to develop a minimally invasive thermogelling system for prolonged local delivery of ALN. For this, different chitosan-based thermogels were developed and characterised in terms of gelation time, injectability, pH, viscosity and thermoreversibility. Chitosan/β-glycerophosphate (CS/βGP) hydrogel pursued temperature-dependent, thermoreversible gelation behaviour and was thus selected for drug loading...
October 26, 2017: Journal of Drug Targeting
https://www.readbyqxmd.com/read/29069920/cleavable-pegylation-a-strategy-for-overcoming-the-peg-dilemma-in-efficient-drug-delivery
#15
Yan Fang, Jianxiu Xue, Shan Gao, Anqi Lu, Dongjuan Yang, Hong Jiang, Yang He, Kai Shi
To prolong the circulation time of drug, PEGylation has been widely used via the enhanced permeability and retention (EPR) effect, thereby providing new hope for better treatment. However, PEGylation also brings the "PEG dilemma", which is difficult for the cellular absorption of drugs and subsequent endosomal escape. As a result, the activity of drugs is inevitably lost after PEG modification. To achieve successful drug delivery for effective treatment, the crucial issue associated with the use of PEG-lipids, that is, "PEG dilemma" must be addressed...
December 2017: Drug Delivery
https://www.readbyqxmd.com/read/29062888/jamming-and-overpacking-fuzzy-microgels-deformation-interpenetration-and-compression
#16
Gaurasundar M Conley, Philippe Aebischer, Sofi Nöjd, Peter Schurtenberger, Frank Scheffold
Tuning the solubility of fuzzy polymer microgels by external triggers, such as temperature or pH, provides a unique mechanism for controlling the porosity and size of colloidal particles on the nanoscale. As a consequence, these smart microgel particles are being considered for applications ranging from viscosity modifiers and sensing to drug delivery and as models for the glass and the jamming transition. Despite their widespread use, little is known about how these soft particles adapt their shape and size under strong mechanical compression...
October 2017: Science Advances
https://www.readbyqxmd.com/read/29061050/temperature-ph-enzyme-triple-responsive-cationic-protein-paa-b-pnipaam-nanogels-for-controlled-anticancer-drug-and-photosensitizer-delivery-against-multidrug-resistant-breast-cancer-cells
#17
Trong-Ming Don, Kun-Ying Lu, Li-Jie Lin, Chun-Hua Hsu, Jui-Yu Wu, Fwu-Long Mi
The tumor microenvironments are often acidic and overexpress specific enzymes. In this work, we synthesized a poly(AA-b-NIPAAm) copolymer (PAA-b-PNIPAAm) using a reversible addition-fragmentation chain transfer (RAFT) polymerization method. PAA-b-PNIPAAm and a cationic protein (protamine) were self-assembled into nanogels, which effectively reduced the cytotoxicity of protamine. The protamine/PAA-b-PNIPAAm nanogels were responsive to the stimuli including temperature, pH and enzyme due to disaggregation of PAA-b-PNIPAAm, change in random coil/α-helix conformation of protamine, and enzymatic hydrolysis of the protein...
October 23, 2017: Molecular Pharmaceutics
https://www.readbyqxmd.com/read/29060449/an-integrated-system-for-the-monitoring-of-therapy-and-drug-s-side-effects-in-lymphoproliferative-disorders
#18
Luca Vollero, Ombretta Annibali, Emiliano Schena, Valeria Tomarchio, Giuseppe Cimino, Natalia Cenfra, Giuseppe Avvisati
The wide diffusion of telecommunication systems and the availability of cheap computational devices, such as smart wearable, PDA and smartphones, is multiplying the number of collaborative and remote-monitored applications accessible to a large mass of people. In particular, this scenario makes it possible the implementation of specific systems that improve the control of patients with minimal impact on the quality of their lives. This paper moves in this context and presents a general system for the continuous monitoring at home of therapy and disease symptoms...
July 2017: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/29052539/engineering-diagnostic-and-therapeutic-gut-bacteria
#19
Brian P Landry, Jeffrey J Tabor
Genetically engineered bacteria have the potential to diagnose and treat a wide range of diseases linked to the gastrointestinal tract, or gut. Such engineered microbes will be less expensive and invasive than current diagnostics and more effective and safe than current therapeutics. Recent advances in synthetic biology have dramatically improved the reliability with which bacteria can be engineered with the sensors, genetic circuits, and output (actuator) genes necessary for diagnostic and therapeutic functions...
October 2017: Microbiology Spectrum
https://www.readbyqxmd.com/read/29049540/feasibility-process-and-outcomes-of-cardiovascular-clinical-trial-data-sharing-a-reproduction-analysis-of-the-smart-af-trial
#20
Hawkins C Gay, Abigail S Baldridge, Mark D Huffman
Importance: Data sharing is as an expanding initiative for enhancing trust in the clinical research enterprise. Objective: To evaluate the feasibility, process, and outcomes of a reproduction analysis of the THERMOCOOL SMARTTOUCH Catheter for the Treatment of Symptomatic Paroxysmal Atrial Fibrillation (SMART-AF) trial using shared clinical trial data. Design, Setting, and Participants: A reproduction analysis of the SMART-AF trial was performed using the data sets, data dictionary, case report file, and statistical analysis plan from the original trial accessed through the Yale Open Data Access Project using the SAS Clinical Trials Data Transparency platform...
October 18, 2017: JAMA Cardiology
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