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https://www.readbyqxmd.com/read/28443922/friction-lubrication-and-in-situ-mechanics-of-poroelastic-cellulose-hydrogels
#1
G K Dolan, G E Yakubov, M R Bonilla, P Lopez-Sanchez, J R Stokes
The tribology between biphasic materials is challenging to predict and interpret due to the interrelationship between mechanical properties, microstructure and movement of the fluid phase contained within. A new approach is presented to deconvolute these effects for cellulose hydrogels, which have a fibrous network that is akin to the microstructure of articular cartilage and plant cell walls. This is achieved by developing a tribo-rheological technique that uniquely incorporates in situ mechanical characterisation (compression-relaxation and small amplitude oscillatory shear) immediately prior to measuring the tribological response between pairs of hydrogels...
April 26, 2017: Soft Matter
https://www.readbyqxmd.com/read/28442627/papers-of-note-in-science-translational-medicine9-386
#2
Leslie K Ferrarelli
This week's articles describe a new hydrogel that promotes chronic wound healing and a way to limit intestinal tissue damage from radiation, chemo, or hematopoietic cell transplant therapies.
April 25, 2017: Science Signaling
https://www.readbyqxmd.com/read/28441604/digital-quantitative-analysis-of-microrna-in-single-cell-based-on-ligation-depended-polymerase-colony-polony
#3
Hui Wang, Honghong Wang, Xinrui Duan, Chenghui Liu, Zhengping Li
The ability to dissect cell-to-cell variations of microRNA (miRNA) expression with single-cell resolution has become a powerful tool to investigate the regulatory function of miRNAs in biological processes and the pathogenesis of miRNA-related diseases. Herein, we have developed a novel scheme for digital detection of miRNA in single cell by using the ligation-depended DNA polymerase colony (polony). Firstly, two simply designed target-specific DNA probes were ligated by using individual miRNA as the template...
April 7, 2017: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/28433171/gellan-gum-based-physical-hydrogels-incorporating-highly-valuable-endogen-molecules-and-associating-bmp-2-as-bone-formation-platforms
#4
Rita López-Cebral, Ana Civantos, Viviana Ramos, Begoña Seijo, José Luis López-Lacomba, José Vicente Sanz-Casado, Alejandro Sanchez
Physical hydrogels have been designed for a double purpose: as growth factor delivery systems and as scaffolds to support cell colonization and formation of new bone. Specifically, the polysaccharide gellan gum and the ubiquitous endogenous molecules chondroitin, albumin and spermidine have been used as exclusive components of these hydrogels. The mild ionotropic gelation technique was used to preserve the bioactivity of the selected growth factor, rhBMP-2. In vitro tests demonstrated the effective delivery of rhBMP-2 in its bioactive form...
July 1, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28428056/recent-development-of-synthetic-nonviral-systems-for-sustained-gene-delivery
#5
REVIEW
Yonggang Xiang, Nwe Nwe Linn Oo, Jin Ping Lee, Zibiao Li, Xian Jun Loh
Sustained gene delivery is of particular importance today because it circumvents the need for repeated therapeutic administration and provides spatial and temporal control of the release profile. Better understanding of the genetic basis of diseases and advances in gene therapy have propelled significant research on biocompatible gene carriers for therapeutic purposes. Varied biodegradable polymer-based architectures have been used to create new compositions with unique properties suitable for sustained gene delivery...
April 18, 2017: Drug Discovery Today
https://www.readbyqxmd.com/read/28424334/glycosaminoglycan-based-hydrogels-capture-inflammatory-chemokines-and-rescue-defective-wound-healing-in-mice
#6
Nadine Lohmann, Lucas Schirmer, Passant Atallah, Elke Wandel, Ruben A Ferrer, Carsten Werner, Jan C Simon, Sandra Franz, Uwe Freudenberg
Excessive production of inflammatory chemokines can cause chronic inflammation and thus impair cutaneous wound healing. Capturing chemokine signals using wound dressing materials may offer powerful new treatment modalities for chronic wounds. Here, a modular hydrogel based on end-functionalized star-shaped polyethylene glycol (starPEG) and derivatives of the glycosaminoglycan (GAG) heparin was customized for maximal chemokine sequestration. The material is shown to effectively scavenge the inflammatory chemokines MCP-1 (monocyte chemoattractant protein-1), IL-8 (interleukin-8), and MIP-1α (macrophage inflammatory protein-1α) and MIP-1β (macrophage inflammatory protein-1β) in wound fluids from patients suffering from chronic venous leg ulcers and to reduce the migratory activity of human monocytes and polymorphonuclear neutrophils...
April 19, 2017: Science Translational Medicine
https://www.readbyqxmd.com/read/28422241/super-tough-ultra-stretchable-and-strongly-compressive-hydrogels-with-core-shell-latex-particles-inducing-efficient-aggregation-of-hydrophobic-chains
#7
Xiuyan Ren, Chang Huang, Lijie Duan, Baijun Liu, Lvjun Bu, Shuang Guan, Jiliang Hou, Huixuan Zhang, Guanghui Gao
Toughness, strechability and compressibility for hydrogels were ordinarily balanced for their use as mechanically responsive materials. For example, macromolecular microsphere composite hydrogels with chemical crosslinking exhibited excellent compression strength and strechability, but poor tensile stress. Here, a novel strategy for the preparation of a super-tough, ultra-stretchable and strongly compressive hydrogel was proposed by introducing core-shell latex particles (LPs) as crosslinking centers for inducing efficient aggregation of hydrophobic chains...
April 19, 2017: Soft Matter
https://www.readbyqxmd.com/read/28418112/photoresponsive-passive-micromixers-based-on-spiropyran-size-tunable-hydrogels
#8
Jeroen Ter Schiphorst, Giuseppe G Melpignano, Hossein Eslami Amirabadi, Menno H J M Houben, Sterre Bakker, Jaap M J den Toonder, Albertus P H J Schenning
Microfluidic devices allow the manipulation of fluids down to the micrometer scale and are receiving a lot of attention for applications where low volumes and high throughputs are required. In these micro channels, laminar flow usually dominates, which requires long residence times of the fluids, limiting the flow speed and throughput. Here a switchable passive mixer has been developed to control mixing and to easily clean microchannels. The mixer is based on a photoresponsive spiropyran based hydrogel of which the dimensions can be tuned by changing the intensity of the light...
April 18, 2017: Macromolecular Rapid Communications
https://www.readbyqxmd.com/read/28417597/ultrahigh-water-content-superelastic-and-shape-memory-nanofiber-assembled-hydrogels-exhibiting-pressure-responsive-conductivity
#9
Yang Si, Lihuan Wang, Xueqin Wang, Ning Tang, Jianyong Yu, Bin Ding
High-water-content hydrogels that are both mechanically robust and conductive could have wide applications in fields ranging from bioengineering and electronic devices to medicine; however, creating such materials has proven to be extremely challenging. This study presents a scalable methodology to prepare superelastic, cellular-structured nanofibrous hydrogels (NFHs) by combining alginate and flexible SiO2 nanofibers. This approach causes naturally abundant and sustainable alginate to assemble into 3D elastic bulk NFHs with tunable water content and desirable shapes on a large scale...
April 18, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28416398/synthesis-characterization-and-evaluation-of-poly-aminoethyl-modified-chitosan-and-its-hydrogel-used-as-antibacterial-wound-dressing
#10
Yubei Zhang, Qifeng Dang, Chengsheng Liu, Jingquan Yan, Dongsu Cha, Shengnan Liang, Xiaoli Li, Bing Fan
This study aims to develop new antibacterial hydrogel wound dressings composed of poly(aminoethyl) modified chitosan (PAEMCS). FTIR, (1)H NMR, and elemental analysis demonstrated that PAEMCS was successfully synthesized via grafting poly(aminoethyl) groups onto hydroxyl groups on chitin first, and removing acetyl groups from the grafted polymer afterward. XRD and TGA implied its well-defined crystallinity and thermostability. Furthermore, a series of hydrogels were fabricated under the participation of dipotassium hydrogen phosphate (DHP)...
April 14, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28415545/engineering-bone-regeneration-with-novel-cell-laden-hydrogel-microfiber-injectable-calcium-phosphate-scaffold
#11
Yang Song, Chi Zhang, Ping Wang, Lin Wang, Chunyun Bao, Michael D Weir, Mark A Reynolds, Ke Ren, Liang Zhao, Hockin H K Xu
Cell-based tissue engineering is promising to create living functional tissues for bone regeneration. The implanted cells should be evenly distributed in the scaffold, be fast-released to the defect and maintain high viability in order to actively participate in the regenerative process. Herein, we report an injectable calcium phosphate cement (CPC) scaffold containing cell-encapsulating hydrogel microfibers with desirable degradability that could deliver cells in a timely manner and maintain cell viability...
June 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28415489/design-of-salecan-containing-semi-ipn-hydrogel-for-amoxicillin-delivery
#12
Xiaoliang Qi, Wei Wei, Junjian Li, Ting Su, Xihao Pan, Gancheng Zuo, Jianfa Zhang, Wei Dong
Salecan is a new linear extracellular β-glucan. The unique structure and beneficial properties of Salecan makes it an appealing material in biomedical applications. In this work, novel drug devices based on Salecan in a hydrogel matrix of poly(N-(3-dimethylaminopropyl)acrylamide-co-acrylamide) (Salecan/PDA) were fabricated via free radical polymerization for controlled release of amoxicillin. It was demonstrated that amoxicillin was efficiently encapsulated into the developed hydrogels and released in a Salecan dose-dependent and pH-sensitive manner...
June 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28415445/microstructural-and-surface-modifications-and-hydroxyapatite-coating-of-ti-6al-4v-triply-periodic-minimal-surface-lattices-fabricated-by-selective-laser-melting
#13
Chunze Yan, Liang Hao, Ahmed Hussein, Qingsong Wei, Yusheng Shi
Ti-6Al-4V Gyroid triply periodic minimal surface (TPMS) lattices were manufactured by selective laser melting (SLM). The as-built Ti-6Al-4V lattices exhibit an out-of-equilibrium microstructure with very fine α' martensitic laths. When subjected to the heat treatment of 1050°C for 4h followed by furnace cooling, the lattices show a homogenous and equilibrium lamellar α+β microstructure with less dislocation and crystallographic defects compared with the as-built α' martensite. The as-built lattices present very rough strut surfaces bonded with plenty of partially melted metal particles...
June 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28415434/design-and-development-of-a-hybrid-bioartificial-water-induced-shape-memory-polymeric-material-as-an-integral-component-for-the-anastomosis-of-human-hollow-organs
#14
Siriana Paonessa, Niccoletta Barbani, Elisa Cibrario Rocchietti, Claudia Giachino, Caterina Cristallini
A large number of pathologies require the resection of the bowel and anastomoses to rejoin the two remaining stumps to regain lumen patency. Various materials have been used to rejoin one bowel end to the other such as catgut, stainless steel, and absorbable sutures. The present method for anastomosis surgery uses an entero-entero anastomosis (EEA) circular stapler with only a staple line. This method can have some drawbacks, such as intracellular fluid leakage and local inflammations. The aim of this study is to design and develop a novel bioartificial polymer with a ring shape made of polyvinyl alcohol (PVA) and gelatin (80/20 ratio (w/w)) loaded both directly with acetylsalicylic acid and with nanoparticles incorporating the same drug to reduce local inflammation even for a prolonged period of time...
June 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28411451/anisotropic-tough-double-network-hydrogel-from-fish-collagen-and-its-spontaneous-in%C3%A2-vivo-bonding-to-bone
#15
Md Tariful Islam Mredha, Nobuto Kitamura, Takayuki Nonoyama, Susumu Wada, Keiko Goto, Xi Zhang, Tasuku Nakajima, Takayuki Kurokawa, Yasuaki Takagi, Kazunori Yasuda, Jian Ping Gong
Soft supporting tissues in the human body, such as cartilages and ligaments, are tough materials and firmly fixed to bones. These soft tissues, once injured, cannot regenerate spontaneously in vivo. Developing tough and biocompatible hydrogels as artificial soft supporting tissues would substantially improve outcomes after soft tissue injury. Collagen is the main rigid component in soft connective tissues which is organized in various hierarchical arrays. We have successfully developed a novel class of collagen fibril-based tough hydrogels based on the double network (DN) concept using swim bladder collagen (SBC) extracted from Bester sturgeon fish...
July 2017: Biomaterials
https://www.readbyqxmd.com/read/28411103/-endogenous-regeneration-engineering-growth-factors-for-stroke
#16
REVIEW
Su Jing Chan, Christopher Love, Myron Spector, Simon M Cool, Victor Nurcombe, Eng H Lo
Despite the efforts in developing therapeutics for stroke, recombinant tissue plasminogen activator (rtPA) remains the only FDA approved drug for ischemic stroke. Regenerative medicine targeting endogenous growth factors has drawn much interest in the clinical field as it provides potential restoration for the damaged brain tissue without being limited by a narrow therapeutic window. To date, most of the translational studies using regenerative medicines have encountered problems and failures. In this review, we discuss the effects of some trophic factors which include of erythropoietin (EPO), brain derived neurotrophic factor (BDNF), granulocyte-colony stimulating factor (G-CSF), vascular endothelial growth factor (VEGF), fibroblast growth factor (FGF), epidermal growth factor (EGF) and heparin binding epidermal growth factor (HB-EGF) in experimental ischemic stroke models and elaborate the lost in translation of the candidate growth factors from bench to bedside...
April 11, 2017: Neurochemistry International
https://www.readbyqxmd.com/read/28401944/lignin-graft-polyoxazoline-conjugated-triazole-a-novel-anti-infective-ointment-to-control-persistent-inflammation
#17
Denial Mahata, Malabendu Jana, Arundhuti Jana, Abhishek Mukherjee, Nibendu Mondal, Tilak Saha, Subhajit Sen, Golok B Nando, Chinmay K Mukhopadhyay, Ranadhir Chakraborty, Santi M Mandal
Lignin, one of the most abundant renewable feedstock, is used to develop a biocompatible hydrogel as anti-infective ointment. A hydrophilic polyoxazoline chain is grafted through ring opening polymerization, possess homogeneous spherical nanoparticles of 10-15 nm. The copolymer was covalently modified with triazole moiety to fortify the antimicrobial and antibiofilm activities. The hydrogel was capable of down regulating the expression level of IL-1β in LPS induced macrophage cells, and to cause significant reduction of iNOS production...
April 12, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28396708/design-and-characterization-of-hydrogel-based-microfluidic-devices-with-biomimetic-solute-transport-networks
#18
Hyung-Jun Koo, Orlin D Velev
Hydrogel could serve as a matrix material of new classes of solar cells and photoreactors with embedded microfluidic networks. These devices mimic the structure and function of plant leaves, which are a natural soft matter based microfluidic system. These unusual microfluidic-hydrogel devices with fluid-penetrable medium operate on the basis of convective-diffusive mechanism, where the liquid is transported between the non-connected channels via molecular permeation through the hydrogel. We define three key designs of such hydrogel devices, having linear, T-shaped, and branched channels and report results of numerical simulation of the process of their infusion with solute carried by the incoming fluid...
March 2017: Biomicrofluidics
https://www.readbyqxmd.com/read/28392831/directing-three-dimensional-multicellular-morphogenesis-by-self-organization-of-vascular-mesenchymal-cells-in-hyaluronic-acid-hydrogels
#19
Xiaolu Zhu, Shiva Gojgini, Ting-Hsuan Chen, Peng Fei, Siyan Dong, Chih-Ming Ho, Tatiana Segura
BACKGROUND: Physical scaffolds are useful for supporting cells to form three-dimensional (3D) tissue. However, it is non-trivial to develop a scheme that can robustly guide cells to self-organize into a tissue with the desired 3D spatial structures. To achieve this goal, the rational regulation of cellular self-organization in 3D extracellular matrix (ECM) such as hydrogel is needed. RESULTS: In this study, we integrated the Turing reaction-diffusion mechanism with the self-organization process of cells and produced multicellular 3D structures with the desired configurations in a rational manner...
2017: Journal of Biological Engineering
https://www.readbyqxmd.com/read/28392307/electrically-responsive-core-shell-hybrid-microfibers-for-controlled-drug-release-and-cell-culture
#20
Chuntao Chen, Xiao Chen, Heng Zhang, Qi Zhang, Li Wang, Chenxi Li, Beibei Dai, Jiazhi Yang, Jian Liu, Dongping Sun
It is an active research field to develop fiber-shaped smart materials for biomedical applications. Here we report the development of the multifunctional core-shell hybrid microfibers with excellent mechanical and electrical performance as a new smart biomaterial. The microfibers were synthesized using a combination of co-axial spinning with a microfluidic device and subsequent dip-coating, containing a hydrogel core of bacterial cellulose (BC) and a conductive polymer shell layer of poly(3,4-ethylenedioxythiophene) (PEDOT)...
April 6, 2017: Acta Biomaterialia
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