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https://www.readbyqxmd.com/read/28544973/pegylation-of-a-tlr2-agonist-based-vaccine-delivery-system-improves-antigen-trafficking-and-the-magnitude-of-ensuing-antibody-and-cd8-t-cell-responses
#1
Toshiki Sekiya, Junya Yamagishi, John Henry V Gray, Paul G Whitney, Axel Martinelli, Weiguang Zeng, Chinn Yi Wong, Chihiro Sugimoto, David C Jackson, Brendon Y Chua
The lipopeptide R4Pam2Cys is an agonist for toll-like receptor-2 (TLR2), a key pathogen-associated molecular pattern receptor expressed on many antigen-presenting cells such as dendritic cells (DCs). Electrostatic association of R4Pam2Cys with soluble protein antigens significantly enhances their immunogenicity and there is evidence to suggest that reducing the size of suitably adjuvanted-antigen complexes in solution may further improve their immunostimulatory capabilities. In this study, we investigated how incorporation of polyethylene glycol (PEG) into R4Pam2Cys affects the size, activity and efficacy of formed antigen-lipopeptide complexes...
May 11, 2017: Biomaterials
https://www.readbyqxmd.com/read/28541655/in-vitro-study-of-receptor-mediated-silica-nanoparticles-delivery-across-blood-brain-barrier
#2
Yang Song, Dan Du, Lei Li, Jun Xu, Prashanta Dutta, Yuehe Lin
A brain drug delivery system has been demonstrated by attaching lactoferrin (Lf) on the silica nanoparticles (Si NPs). The nanoparticle surface was modified with the polyethylene glycol to reduce protein adsorption. The transport efficiency of Lf attached Si NPs was studied using an in vitro blood-brain barrier (BBB) model consists of three distinct types of cells: endocytes, pericytes and astrocytes. Transfer of NPs from the apical side to the basolateral side is observed. The results indicated that Lf attached Si NPs demonstrated enhanced transport efficiency across the BBB with size-dependent compared to bare Si NPs...
May 25, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28537756/chemoembolization-adopting-polyethylene-glycol-drug-eluting-embolics-loaded-with-doxorubicin-for-the-treatment-of-hepatocellular-carcinoma
#3
Camillo Aliberti, Riccardo Carandina, Donatella Sarti, Luca Mulazzani, Enrico Pizzirani, Stefano Guadagni, Giammaria Fiorentini
OBJECTIVE: The purpose of this study is to determine the efficacy and tolerability of transarterial chemoembolization (TACE) using polyethylene glycol (PEG) drug-elutable microspheres loaded with doxorubicin for treatment of hepatocellular carcinoma (HCC). SUBJECTS AND METHODS: Forty-two patients with unresectable HCC, as determined by a tumor board, were assigned to undergo TACE and were treated with PEG drug-elutable embolics loaded with doxorubicin. Patients were prospectively enrolled and included 32 (76%) men and 10 (24%) women...
May 24, 2017: AJR. American Journal of Roentgenology
https://www.readbyqxmd.com/read/28537502/suitability-of-different-natural-and-synthetic-biomaterials-for-dental-pulp-tissue-engineering
#4
Kerstin M Galler, Ferdinand Brandl, Susanne Kirchhof, Matthias Widbiller, Andreas Eidt, Wolfgang Buchalla, Achim Goepferich, Gottfried Schmalz
Dental pulp tissue engineering is possible after insertion of pulpal stem cells combined with a scaffold into empty root canals. Commonly used biomaterials are collagen or poly(lactic) acid, which are either difficult to modify or to insert into such a narrow space. New hydrogel scaffolds with bioactive, specifically tailored functions could optimize the conditions to engineer dental pulp. Different synthetic and natural hydrogels were tested for their suitability to engineer dental pulp. Two functionalized modifications of polyethylene glycol were developed in this study and compared to a self-assembling peptide as well as to collagen and fibrin...
May 24, 2017: Tissue Engineering. Part A
https://www.readbyqxmd.com/read/28536588/a-novel-wheat-c-bzip-gene-tabzip14-b-participates-in-salt-and-freezing-tolerance-in-transgenic-plants
#5
Lina Zhang, Lichao Zhang, Chuan Xia, Lifeng Gao, Chenyang Hao, Guangyao Zhao, Jizeng Jia, Xiuying Kong
The group C-bZIP transcription factors (TFs) are involved in diverse biological processes, such as the regulation of seed storage protein (SSP) production and the responses to pathogen challenge and abiotic stress. However, our knowledge of the abiotic functions of group C-bZIP genes in wheat remains limited. Here, we present the function of a novel TabZIP14-B gene in wheat. This gene belongs to the group C-bZIP TFs and contains six exons and five introns; three haplotypes were identified among accessions of tetraploid and hexaploid wheat...
2017: Frontiers in Plant Science
https://www.readbyqxmd.com/read/28536475/a-simple-silver-nanowire-patterning-method-based-on-poly-ethylene-glycol-photolithography-and-its-application-for-soft-electronics
#6
Youngsang Ko, Jeonghun Kim, Dabum Kim, Yusuke Yamauchi, Jung Ho Kim, Jungmok You
Hydrogel-based flexible microelectrodes have garnered considerable attention recently for soft bioelectronic applications. We constructed silver nanowire (AgNW) micropatterns on various substrates, via a simple, cost-effective, and eco-friendly method without aggressive etching or lift-off processes. Polyethylene glycol (PEG) photolithography was employed to construct AgNW patterns with various shapes and sizes on the glass substrate. Based on a second hydrogel gelation process, AgNW patterns on glass substrate were directly transferred to the synthetic/natural hydrogel substrates...
May 23, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28536019/in-vitro-studies-of-dna-condensation-by-bridging-protein-in-a-crowding-environment
#7
Sravani K Ramisetty, Petter Langlete, Rahmi Lale, Rita S Dias
The macromolecules of the bacterial cell occupy 20-40% of the total cytosol volume, and crowded environments have long been known to compact and stabilize DNA. Nevertheless, investigations on DNA-protein binding are generally performed in the absence of crowding, which may yield an incomplete understanding of how nucleoid-assembling proteins work. A family of such proteins, abundant in Gram-negative bacteria, is the histone-like nucleoid structuring proteins (H-NS). Herein, the synergistic role of macromolecular crowding (mimicked using polyethylene glycol, PEG) and H-NS was investigated using fluorescence correlation spectroscopy (FCS) and enzyme protection assays...
May 20, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28535885/development-of-a-simplified-approach-for-the-fabrication-of-localised-surface-plasmon-resonance-sensors-based-on-gold-nanorods-functionalized-using-mixed-polyethylene-glycol-layers
#8
Jing-Hong Pai, Chih-Tsung Yang, Hung-Yao Hsu, A Bruce Wedding, Benjamin Thierry
A simplified approach for the fabrication of localised surface plasmon resonance (LSPR) sensors based on gold nanorods (GNRs) is described and validated in a model immunoassay for the activated leukocyte cell adhesion molecule (ALCAM) cancer biomarker. Towards improving on standard bottom-up LSPR sensor fabrication methodologies, we demonstrate that GNRs bioconjugated with monoclonal antibodies can be readily covalently immobilized onto silanized glass substrates to yield highly sensitive LSPR sensors. To maximise the performance of the proposed sensors, mixed polyethylene glycol adlayers were optimized in regards to the bioconjugation of monoclonal antibodies using the standard carbodiimide chemistry...
June 29, 2017: Analytica Chimica Acta
https://www.readbyqxmd.com/read/28534633/micropatterning-of-multiple-photonic-colloidal-crystal-gels-for-flexible-structural-color-films
#9
Noriyuki Suzuki, Eiji Iwase, Hiroaki Onoe
We herein report the micropatterning of flexible multiple photonic colloidal crystal gels (PCCGs) using single-layered microchannel. These patterned PCCGs exhibit structural colors that can be tuned by adjustment of the diameter and concentration of the colloidal particles in precursor solutions of N-isopropylacrylamide (NIPAM) or polyethylene glycol diacrylate (PEGDA). The precursor solutions containing dispersed colloidal particles were selectively injected into single-layered microchannels where they polymerized rapidly...
May 23, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28533682/polyethylene-glycol-poly-%C3%AE%C2%B5-benzyloxycarbonyl-l-lysine-conjugated-vegf-sirna-for-antiangiogenic-gene-therapy-in-hepatocellular-carcinoma
#10
Gangmin Wang, XiaoLong Gao, GuoJun Gu, ZhiHong Shao, MingHua Li, PeiJun Wang, JianRong Yang, XiaoJun Cai, YongYong Li
A polyethylene glycol-poly(ε-benzyloxycarbonyl-l-lysine) (PEG-SS-PLL) block copolymer based on a disulfide-linked, novel biodegradable catiomer bearing a PEG-sheddable shell was developed to avoid "PEG dilemma" in nanoparticle intracellular tracking of PEG-PLL where PEG was nondegradable. However, PEG-SS-PLL catiomers have not been used to deliver small interfering VEGF RNA (siVEGF) in antiangiogenesis gene therapy. In this study, we aimed to investigate whether this novel biodegradable catiomer can deliver siVEGF into cancer cells and at the same time have an antitumor effect in a xenograft mouse model...
2017: International Journal of Nanomedicine
https://www.readbyqxmd.com/read/28533333/pgc-1%C3%AE-peroxisome-proliferator-activated-receptor-%C3%AE-coactivator-1-%C3%AE-overexpression-in-coronary-artery-disease-recruits-no-and-hydrogen-peroxide-during-flow-mediated-dilation-and-protects-against-increased-intraluminal-pressure
#11
Andrew O Kadlec, Dawid S Chabowski, Karima Ait-Aissa, Joseph C Hockenberry, Mary F Otterson, Matthew J Durand, Julie K Freed, Andreas M Beyer, David D Gutterman
Blood flow through healthy human vessels releases NO to produce vasodilation, whereas in patients with coronary artery disease (CAD), the mediator of dilation transitions to mitochondria-derived hydrogen peroxide (mtH2O2). Excessive mtH2O2 production contributes to a proatherosclerotic vascular milieu. Loss of PGC-1α (peroxisome proliferator-activated receptor γ coactivator 1α) is implicated in the pathogenesis of CAD. We hypothesized that PGC-1α suppresses mtH2O2 production to reestablish NO-mediated dilation in isolated vessels from patients with CAD...
May 22, 2017: Hypertension
https://www.readbyqxmd.com/read/28532900/combinatorial-screening-of-3d-biomaterial-properties-that-promote-myofibrogenesis-for-mesenchymal-stromal-cell-based-heart-valve-tissue-engineering
#12
Jenna Usprech, David A Romero, Cristina H Amon, Craig A Simmons
The physical and chemical properties of a biomaterial integrate with soluble cues in the cell microenvironment to direct cell fate and function. Predictable biomaterial-based control of integrated cell responses has been investigated with two-dimensional (2D) screening platforms, but integrated responses in 3D have largely not been explored systematically. To address this need, we developed a screening platform using polyethylene glycol norbornene (PEG-NB) as a model biomaterial with which the polymer wt% (to control elastic modulus) and adhesion peptide types (RGD, DGEA, YIGSR) and densities could be controlled independently and combinatorially in arrays of 3D hydrogels...
May 19, 2017: Acta Biomaterialia
https://www.readbyqxmd.com/read/28532677/predicting-melt-rheology-for-hot-melt-extrusion-by-means-of-a-simple-tg-measurement
#13
Esther S Bochmann, Elgin E Üstüner, Andreas Gryczke, Karl G Wagner
The feasibility of predicting melt rheology by using the glass transition temperature (Tg) of a desired amorphous solid dispersion (ASD) for hot-melt extrusion (HME) and other melt based processes is presented. Three groups of three different active pharmaceutical ingredients (APIs) or plasticizer/copovidone mixtures, with identical glass transition in rheological testing, were used. Their rheological behavior as a function of temperature and frequency were analyzed by means of small amplitude oscillatory shear (SAOS) on an oscillatory rheometer...
May 19, 2017: European Journal of Pharmaceutics and Biopharmaceutics
https://www.readbyqxmd.com/read/28532223/preliminary-study-on-fabrication-characterization-and-synergistic-anti-lung-cancer-effects-of-self-assembled-micelles-of-covalently-conjugated-celastrol-polyethylene-glycol-ginsenoside-rh2
#14
Peng Li, XiaoYue Zhou, Ding Qu, Mengfei Guo, Chenyi Fan, Tong Zhou, Yang Ling
The aim of this study was to develop an amphipathic polyethylene glycol (PEG) derivative that was bi-terminally modified with celastrol and ginsenoside Rh2 (Celastrol-PEG-G Rh2). Such derivative was capable of forming novel, celastrol-loaded polymeric micelles (CG-M) for endo/lysosomal delivery and thereby synergistic treatment of lung cancer. Celastrol-PEG-G Rh2 with a yield of 55.6% was first synthesized and characterized. Its critical micellar concentration was 1 × 10(-5 )M, determined by pyrene entrapment method...
November 2017: Drug Delivery
https://www.readbyqxmd.com/read/28532118/facile-synthesis-of-polymeric-fluorescent-organic-nanoparticles-based-on-the-self-polymerization-of-dopamine-for-biological-imaging
#15
Yingge Shi, Ruming Jiang, Meiying Liu, Lihua Fu, Guangjian Zeng, Qing Wan, Liucheng Mao, Fengjie Deng, Xiaoyong Zhang, Yen Wei
Polymeric fluorescent organic nanoparticles (polymer-FONs) have raised considerable research attention for biomedical applications owing to their advantages as compared with fluorescent inorganic nanoparticles and small organic molecules. In this study, we presented an efficient, facile and environment-friendly strategy to produce polymer-FONs, which relied on the self-polymerization of dopamine and polyethyleneimine (PEI) in rather mild conditions. To obtain the final polymer-FONs, aldehyde group-containing copolymers (named as poly(UA-co-PEGMA)) were synthesized by reversible addition-fragmentation chain-transfer polymerization using polyethylene glycol methyl ether methacrylate (PEGMA) and 1-undecen-10-al (UA) as monomers...
August 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28532077/preparation-of-robust-braid-reinforced-poly-vinyl-chloride-ultrafiltration-hollow-fiber-membrane-with-antifouling-surface-and-application-to-filtration-of-activated-sludge-solution
#16
Zhuang Zhou, Saeid Rajabzadeh, Lifeng Fang, Taro Miyoshi, Yuriko Kakihana, Hideto Matsuyama
Braid-reinforced hollow fiber membranes with high mechanical properties and considerable antifouling surface were prepared by blending poly(vinyl chloride) (PVC) with poly(vinyl chloride-co-poly(ethylene glycol) methyl ether methacrylate) (poly(VC-co-PEGMA)) copolymer via non-solvent induced phase separation (NIPS). The tensile strength of the braid-reinforced PVC hollow fiber membranes were significantly larger than those of previously reported various types of PVC hollow fiber membranes. The high interfacial bonding strength indicated the good compatibility between the coating materials and the surface of polyethylene terephthalate (PET)-braid...
August 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28531991/multifunctional-polymer-drug-loading-system-with-ph-sensitive-fluorescent-and-targeting-property
#17
Xuening Fei, Shubei Li, Lingyun Cao, Baolian Zhang, Miaozhuo Yu
IA multifunctional drug loading system with pH-sensitive, fluorescent and targeting property was fabricated. Firstly, the amphipathic N-octyl-N'-(2-carboxyl-cyclohexamethenyl) chitosan (OCCC) was prepared by grafting hydrophobic octyl group and hydrophilic hexahydrophthalic anhydride onto chitosan, then it was modified with folic acid (FA) and thiazole orange (TO) using polyethylene glycol (PEG) as the link to fabricate a multifunctional drug loading system TO-PEG-OCCC-PEG-FA. Its chemical structure was determined by Fourier transform infrared spectroscopy (FT-IR), elemental analysis, differential scanning calorimetry (DSC) analysis, UV-vis and fluorescence spectrometer, and the results showed that the substitution degree of hydrophobic/hydrophilic group onto chitosan were 41...
August 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28530538/qualitative-estimation-of-drug-entrapment-efficiency-in-polymeric-nano-micelles-using-dpd
#18
Farzin Hadizadeh, Jamal Shamsara
BACKGROUND: Dissipative particle dynamics (DPD) is a simulation method that one of its applications is in the field of pharmaceutical science and drug delivery. OBJECTIVE: DPD is employed to study morphology and some other characteristics of polymeric nano-micelles. Two systems were considered in this study: system A which includes curcumin, Polycaprolactone (PCL), Polyethylene glycol (PEG) and water beads and system B which includes paclitaxel, Polylactic acid (PLA), PEG and water beads...
May 22, 2017: Pharmaceutical Nanotechnology
https://www.readbyqxmd.com/read/28528954/effects-of-plasticizers-on-the-physicochemical-properties-of-kappa-carrageenan-films-extracted-from-eucheuma-cottonii
#19
A M Ili Balqis, M A R Nor Khaizura, A R Russly, Z A Nur Hanani
The physicochemical properties of κ-carrageenan films extracted from Eucheuma cottonii (E. cottonii) incorporated with different concentrations and types of plasticizers were studied. Glycerol, sorbitol, and polyethylene glycol-300 (PEG-300) in the range of 10 to 60% were used as plasticizers. The results showed that the thickness and moisture content (MC) of films increased significantly (p≤0.05) with the increase in plasticizer concentration. Sorbitol-plasticized films had the lowest values. Sorbitol-plasticized films have better mechanical properties and the lowest water vapor permeability (WVP), solubility and water uptake ratio (WUR) compared with glycerol and PEG-plasticized films (p≤0...
May 18, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28528299/selective-targeting-and-therapy-of-metastatic-and-multidrug-resistant-tumors-using-a-long-circulating-podophyllotoxin-nanoparticle
#20
Aniruddha Roy, Yucheng Zhao, Yang Yang, Andras Szeitz, Tara Klassen, Shyh-Dar Li
Treatment options for metastatic and multidrug resistant (MDR) tumors are limited, and most of the chemotherapeutic drugs exhibit low efficacy against MDR cancers. An anti-tubulin agent podophyllotoxin (PPT) displays high potency against MDR tumor cells. However, due to its poor solubility and non-specificity, PPT cannot be used systemically. We have developed a self-assembling nanoparticle dosage form for PPT (named Celludo) by covalently conjugating PPT and polyethylene glycol (PEG) to acetylated carboxymethyl cellulose (CMC-Ac) via ester linkages...
May 11, 2017: Biomaterials
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