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https://www.readbyqxmd.com/read/29147710/step-by-step-build-up-of-covalent-poly-ethylene-oxide-nanogel-films
#1
S Zahouani, L Hurman, M De Giorgi, C Vigier-Carrière, F Boulmedais, B Senger, B Frisch, P Schaaf, P Lavalle, L Jierry
Hydrogels based on poly(ethylene glycol) (PEG) are commonly used for studies related to cell fate and tissue engineering. Here we present a new covalent layer-by-layer build-up process leading to PEG coatings of nanometer size called "nanogel films". Compared to macroscopic hydrogels, such nanogels should provide a fine control over the structure and the thickness of the coating. Alternated deposition of bifunctional and tetra functional PEG molecules reacting through thiol/maleimide click chemistry is evaluated by quartz crystal microbalance...
November 17, 2017: Nanoscale
https://www.readbyqxmd.com/read/29144829/complications-assoicated-with-miragel-for-treatment-of-retinal-detachment
#2
Miin Roh, Nahyoung Grace Lee, John B Miller
MIRAgel (MIRA, Waltham, MA) is a hydrogel buckle that was introduced in 1979 as a new scleral implant for the treatment of retinal detachment. Long-term follow-up of more than 10 years revealed that the hydrolysis of the synthetic hydrophilic material leads to marked expansion of the substance, causing complications such as buckle extrusion and intrusion, eye motility disorder, cosmetic deformities, and periocular infections. Removal of the implant is the treatment of choice in cases with complications, but it is technically difficult due to the friability of the implant, severe scleral ectasia, and relatively high rate of redetachment after removal...
November 16, 2017: Seminars in Ophthalmology
https://www.readbyqxmd.com/read/29144723/inorganic-strengthened-hydrogel-membrane-as-regenerative-periosteum
#3
Tianwen Xin, Yong Gu, Ruoyu Cheng, Jincheng Tang, Zhiyong Sun, Wenguo Cui, Liang Chen
Periosteum plays the pivotal role in neomineralization, vascularization and protection during bone tissue regeneration. However, many artificial periosteum focused only on protection and lacked of the osteogenesis and angiogenesis functional capacity. In this study, we developed a novelty inorganic strengthened gelatin hydrogel membrane via inorganic and organic co-cross-linked double network as artificial periosteum for enhancing the durable angiogenesis and osteogenesis in bone reconstruction. Mesoporous bioactive glass nanoparticles (MBGNs) chemically modified with photo-cross-linkable gelatin derivative (GelMA) were further incorporated into GelMA to fabricate an organic/inorganic co-cross-linked hydrogel membrane (GelMA-G-MBGNs)...
November 16, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29144435/dysregulated-collagen-homeostasis-by-matrix-stiffening-and-tgf-%C3%AE-1-in-fibroblasts-from-idiopathic-pulmonary-fibrosis-patients-role-of-fak-akt
#4
Alícia Giménez, Paula Duch, Marta Puig, Marta Gabasa, Antoni Xaubet, Jordi Alcaraz
Idiopathic pulmonary fibrosis (IPF) is an aggressive disease in which normal lung parenchyma is replaced by a stiff dysfunctional scar rich in activated fibroblasts and collagen-I. We examined how the mechanochemical pro-fibrotic microenvironment provided by matrix stiffening and TGF-β1 cooperates in the transcriptional control of collagen homeostasis in normal and fibrotic conditions. For this purpose we cultured fibroblasts from IPF patients or control donors on hydrogels with tunable elasticity, including 3D collagen-I gels and 2D polyacrylamide (PAA) gels...
November 16, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/29141405/injectable-thermo-sensitive-polypeptide-based-cddp-complexed-hydrogel-for-improving-localized-antitumor-efficacy
#5
Shuangjiang Yu, Dianliang Zhang, Chaoliang He, Wujin Sun, Rangjuan Cao, Shusen Cui, Mingxiao Deng, Zhen Gu, Xuesi Chen
In this study, a type of novel thermo-sensitive polypeptide-based hydrogel with tunable gelation behavior through changing the content of carboxyl groups was developed for the purpose of improving the cisplatin (CDDP) release behavior and enhancing the localized antitumor efficiency. The introduction of carboxyl groups in methoxy-poly(ethylene glycol)-b-(poly(γ-ethyl-L-glutamate-co-L-glutamic acid) (mPEG-b-P(ELG-co-LG)) not only led to adjustable mechanical properties of the hydrogel, but also significantly reduced the burst release of the drug through the complexation between the carboxyl groups of polypeptide and CDDP...
November 15, 2017: Biomacromolecules
https://www.readbyqxmd.com/read/29140605/highly-transparent-and-integrable-surface-texture-change-device-for-localized-tactile-feedback
#6
Ankit, Naveen Tiwari, Mayank Rajput, Nguyen Anh Chien, Nripan Mathews
Human-machine haptic interaction is typically detected by variations in friction, roughness, hardness, and temperature, which combines to create sensation of surface texture change. Most of the current technologies work to simulate changes in tactile perception (via electrostatic, lateral force fields, vibration motors, etc.) without creating actual topographical transformations. This makes it challenging to provide localized feedback. Here, a new concept for on-demand surface texture augmentation that is capable of physically forming local topographic features in any predesigned pattern is demonstrated...
November 15, 2017: Small
https://www.readbyqxmd.com/read/29137788/ultrasonic-assisted-manufacturing-of-new-hydrogel-nanocomposite-biosorbent-containing-calcium-carbonate-nanoparticles-and-tragacanth-gum-for-removal-of-heavy-metal
#7
Shadpour Mallakpour, Amir Abdolmaleki, Farbod Tabesh
This article reports the first incorporation of calcium carbonate nanoparticles (CC NPs) into tragacanth gum (TG) to prepare a new hydrogel nanocomposite (HNC) system using a green, safe, and eco-friendly method, ultrasound irradiation as an efficient biosorbent of heavy metal ions from wastewater. Morphological studies revealed that the surface of obtained HNCs is rough, homogeneous, and porous-like due to the embedding of CC NPs as well as sonication in comparison to the neat TG which has a smooth surface...
March 2018: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/29135262/a-low-molecular-weight-gelator-composed-of-pyrene-and-fluorene-moieties-for-effective-charge-transfer-in-supramolecular-ambidextrous-gel
#8
Samala Murali Mohan Reddy, Pramod Dorishetty, George Augustine, Abhijit P Deshpande, Niraikulam Ayyadurai, Ganesh Shanmugam
Charge-transfer (CT) gel materials obtained from low-molecular-weight (LMW) compounds through a supramolecular self-assembly approach have received fascinating attention by many researchers because of their interesting material property and potential applications. However, most of the CT gel materials constructed were of organogels while the construction of CT gels in the form of a hydrogel is a challenge because of the solubility issue in water, which considerably limits the use of CT hydrogels. Herein, for the first time, we report a new LMW gelator [N(α)-(fluorenylmethoxycarbonyl)-N(ε)-(δ-butyric-1-pyrenyl)-l-lysine, (FmKPy)], composed of two functional moieties such as fluorenylmethoxycarbonyl and pyrene, which not only parade both hydro and organo (ambidextrous) supramolecular gel formation but also exhibit CT ambidextrous gels when mixed with an electron acceptor such as 2,4,7-trinitro-9-fluorenone (TNF)...
November 14, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/29132046/stress-relaxing-hyaluronic-acid-collagen-hydrogels-promote-cell-spreading-fiber-remodeling-and-focal-adhesion-formation-in-3d-cell-culture
#9
Junzhe Lou, Ryan Stowers, Sungmin Nam, Yan Xia, Ovijit Chaudhuri
The physical and architectural cues of the extracellular matrix (ECM) play a critical role in regulating important cellular functions such as spreading, migration, proliferation, and differentiation. Natural ECM is a complex viscoelastic scaffold composed of various distinct components that are often organized into a fibrillar microstructure. Hydrogels are frequently used as synthetic ECMs for 3D cell culture, but are typically elastic, due to covalent crosslinking, and non-fibrillar. Recent work has revealed the importance of stress relaxation in viscoelastic hydrogels in regulating biological processes such as spreading and differentiation, but these studies all utilize synthetic ECM hydrogels that are non-fibrillar...
November 6, 2017: Biomaterials
https://www.readbyqxmd.com/read/29130461/intracellular-coassembly-boosts-the-anti-inflammation-capacity-of-dexamethasone
#10
Wei Tang, Jingbo Yang, Zhibin Zhao, Zhexiong Lian, Gaolin Liang
Dexamethasone (Dex) is one of the essential medicines used to treat inflammation diseases but an overdose of Dex leads to severe adverse effects. The development of a new strategy to boost the anti-inflammation efficacy of Dex is, therefore, important but remains challenging. Herein, by employing an enzyme-instructed self-assembly system, we developed an intracellular coassembly strategy to boost the anti-inflammation efficacy of Dex. Under the catalysis of alkaline phosphatase (ALP), the hydrogelator precursor Nap-Phe-Phe-Tyr(H2PO3)-OH (1p) self-assembled to form Gel 1 but dexamethasone sodium phosphate (Dp) only yielded Dex precipitates...
November 13, 2017: Nanoscale
https://www.readbyqxmd.com/read/29130302/a-cell-mimicking-structure-converting-analog-volume-changes-to-digital-colorimetric-output-with-molecular-selectivity
#11
Zijie Zhang, Yibo Liu, Xiaohan Zhang, Juewen Liu
We herein report a three-component cell-mimicking structure with a peroxidase-like iron oxide nanozyme as the nucleus, a molecularly imprinted hydrogel shell as cytoplasm, and a lipid bilayer membrane. The structure was characterized by cryo and negative stain TEM and also by a calcein leakage test. By introducing charged monomers, the gel shell can swell or shrink in response to salt concentration. By lowering the salt concentration, the gradual 'analog' gel volume change was reflected in a switch-like 'digital' colorimetric output by the burst of membrane and oxidation of substrates such as 3,3',5,5'-tetramethylbenzidine (TMB)...
November 13, 2017: Nano Letters
https://www.readbyqxmd.com/read/29128833/structurally-stable-n-t-butylacrylamide-hydrogel-particles-for-the-capture-of-peptides
#12
Megan Devine, Melanie Juba, Paul Russo, Barney Bishop
Hydrogel particles have proven to be powerful tools for the capture and concentration of low abundance, low molecular weight peptides and proteins from complex biofluids, such as plasma. The primary means of recovering and washing the particles following harvesting is through centrifugation, which can be a very time-consuming process depending on harvest conditions. To improve the process of particle recovery, washing, and elution we have developed new particle formulations: incorporating N-t-butylacrylamide (tBA) in the polymer backbone with monomers bearing more acidic functional groups and higher degrees of cross-linking...
November 2, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/29128535/branched-peptides-integrate-into-self-assembled-nanostructures-and-enhance-biomechanics-of-peptidic-hydrogels
#13
Raffaele Pugliese, Federico Fontana, Amanda Marchini, Fabrizio Gelain
Self-assembling peptides (SAP) have drawn an increasing interest in the tissue engineering community. They display unquestionable biomimetic properties, tailorability and promising biocompatibility. However their use has been hampered by poor mechanical properties making them fragile soft scaffolds. To increase SAP hydrogel stiffness we introduced a novel strategy based on multiple ramifications of (LDLK)3, a well-known linear SAP, connected with one or multiple "lysine knots". Differently branched SAPs were tested by increasing the number of (LDLK)3-like branches and by adding the neuro-regenerative functional motif BMHP1 as a single branch...
November 8, 2017: Acta Biomaterialia
https://www.readbyqxmd.com/read/29128532/laponite-nanoparticle-associated-silated-hydroxypropylmethyl-cellulose-as-an-injectable-reinforced-interpenetrating-network-hydrogel-for-cartilage-tissue-engineering
#14
Cécile Boyer, Lara Figueiredo, Richard Pace, Julie Lesoeur, Thierry Rouillon, Catherine Le Visage, Jean-François Tassin, Pierre Weiss, Jérôme Guicheux, Gildas Rethore
Articular cartilage is a connective tissue which does not spontaneously heal. To address this issue, biomaterial-assisted cell therapy has been researched with promising advances. The lack of strong mechanical properties is still a concern despite significant progress in three-dimensional scaffolds. This article's objective was to develop a composite hydrogel using a small amount of nano-reinforcement clay known as laponites. These laponites were capable of self-setting within the gel structure of the silated hydroxylpropylmethyl cellulose (Si-HPMC) hydrogel...
November 8, 2017: Acta Biomaterialia
https://www.readbyqxmd.com/read/29128530/cell-instructive-pectin-hydrogels-crosslinked-via-thiol-norbornene-photo-click-chemistry-for-skin-tissue-engineering
#15
Rúben F Pereira, Cristina C Barrias, Paulo J Bártolo, Pedro L Granja
Cell-instructive hydrogels are attractive for skin repair and regeneration, serving as interactive matrices to promote cell adhesion, cell-driven remodeling and de novo deposition of extracellular matrix components. This paper describes the synthesis and photocrosslinking of cell-instructive pectin hydrogels using cell-degradable peptide crosslinkers and integrin-specific adhesive ligands. Protease-degradable hydrogels obtained by photoinitiated thiol-norbornene click chemistry are rapidly formed in the presence of dermal fibroblasts, exhibit tunable properties and are capable of modulating the behavior of embedded cells, including the cell spreading, hydrogel contraction and secretion of matrix metalloproteases...
November 8, 2017: Acta Biomaterialia
https://www.readbyqxmd.com/read/29125768/self-assembling-elastin-like-hydrogels-for-timolol-delivery-development-of-an-ophthalmic-formulation-against-glaucoma
#16
Alicia Fernández-Colino, Daniela A Quinteros, Daniel A Allemandi, Alessandra Girotti, Santiago D Palma, F Javier Arias
This work focuses on improving the effectiveness of current therapies against glaucoma by incorporating self-assembled polymers into the ophthalmic formulation. To that end, we first studied the influence of the dispersing medium on the mechanical performance of self-assembling elastin-like (EL) and silk-elastin like (SEL) hydrogels by conducting rheological tests. These polymers were subsequently incorporated into the anti-glaucoma formulation, which contains timolol maleate (TM) as active ingredient, and in vivo tests, namely adhesion tests and intraocular pressure measurements (IOP), were performed in New Zealand rabbits...
November 10, 2017: Molecular Pharmaceutics
https://www.readbyqxmd.com/read/29119227/-hyaluronic-acid-gels-for-pressure-regulation-in-glaucoma-treatment
#17
REVIEW
M Thaller, H Böhm, C Lingenfelder, F Geiger
BACKGROUND: The increasing numbers of glaucoma patients and complications occuring during treatment, such as restenosis and hypotony, require new treatment options to prevent blindness in patients. Therefore, the abovementioned problems should be solved to prolong the lifetime of implants and to prevent repeated surgery. OBJECTIVE: Can a novel stent with hyaluronic acid hydrogels (HA gel) as a functional unit be used to regulate pressure in glaucoma therapy in the long term? MATERIAL AND METHODS: Model stents were filled with HA gels and it was investigated if these could regulate the pressure and what the underlying mechanism is...
November 8, 2017: Der Ophthalmologe: Zeitschrift der Deutschen Ophthalmologischen Gesellschaft
https://www.readbyqxmd.com/read/29117231/human-pancreatic-islet-derived-extracellular-vesicles-modulate-insulin-expression-in-3d-differentiating-ipsc-clusters
#18
Diana Ribeiro, Eva-Marie Andersson, Nikki Heath, Anette Persson-Kry, Richard Collins, Ryan Hicks, Niek Dekker, Anna Forslöw
It has been suggested that extracellular vesicles (EVs) can mediate crosstalk between hormones and metabolites within pancreatic tissue. However, the possible effect of pancreatic EVs on stem cell differentiation into pancreatic lineages remains unknown. Herein, human islet-derived EVs (h-Islet-EVs) were isolated, characterized and subsequently added to human induced pluripotent stem cell (iPSC) clusters during pancreatic differentiation. The h-islet-EVs had a mean size of 117±7 nm and showed positive expression of CD63 and CD81 EV markers as measured by ELISA...
2017: PloS One
https://www.readbyqxmd.com/read/29114635/early-efficacy-of-intra-articular-hyadd%C3%A2-4-hymovis%C3%A2-injections-for-symptomatic-knee-osteoarthritis
#19
Ferdinando Priano
Purpose  The aim of the study was to evaluate the clinical effects of HYADD® 4, an hydrogel based on a hyaluronic acid derivative, in patients with symptomatic knee osteoarthritis, on symptoms, and joint function. Methods  This retrospective study of patients with Kellgren-Lawrence grade II to IV knee osteoarthritis (American College of Rheumatology criteria) enrolled patients who had received two infiltrations of HYADD® 4, (24 mg/3 mL) 1 week apart, and evaluated: pain at rest, pain with movement, change in Western Ontario and McMaster Universities Osteoarthritis Index (WOMAC) score; change in nonsteroidal anti-inflammatory drugs (NSAIDs)/acetaminophen use; satisfaction with therapy; tolerability...
June 2017: Joints
https://www.readbyqxmd.com/read/29109925/saccharification-of-citrus-wastes-by-immobilized-polygalacturonase-in-an-improved-alginate-matrix
#20
Yuly A Ramírez-Tapias, Aldana S Lapasset Laumann, Claudia N Britos, Cintia W Rivero, Jorge A Trelles
Enzyme immobilization using hydrogels is a low-cost and effective system for the degradation of bulk pectin derived from orange industry residues. Polygalacturonases obtained from four different bacterial strains of Streptomyces genus were immobilized in alginate gel and assayed for pectin hydrolysis. The enzyme from Streptomyces halstedii ATCC 10897 proved to be superior and more stable within the alginate matrix. Furthermore, a new strategy to improve alginate bead stability using a mixture of calcium and strontium is reported; this technique allowed enhancing the mechanical properties by combining different amounts of these cations for ionotropic gelation...
December 2017: 3 Biotech
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