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https://www.readbyqxmd.com/read/28737278/multicellular-vascularized-engineered-tissues-through-user-programmable-biomaterial-photodegradation
#1
Christopher K Arakawa, Barry A Badeau, Ying Zheng, Cole A DeForest
A photodegradable material-based approach to generate endothelialized 3D vascular networks within cell-laden hydrogel biomaterials is introduced. Exploiting multiphoton lithography, microchannel networks spanning nearly all size scales of native human vasculature are readily generated with unprecedented user-defined 4D control. Intraluminal channel architectures of synthetic vessels are fully customizable, providing new opportunities for next-generation microfluidics and directed cell function.
July 24, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28736889/fast-adsorption-of-soft-hydrogel-microspheres-on-solid-surfaces-in-aqueous-solution
#2
Shusuke Matsui, Takuma Kureha, Seina Hiroshige, Mikihiro Shibata, Takayuki Uchihashi, Daisuke Suzuki
The real-time adsorption behavior of polymeric colloidal microspheres onto solid surfaces in aqueous solution was visualized for the first time using high-speed atomic force microscopy (HS-AFM) in order to reveal how the softness of the microspheres affects their dynamic adsorption. Studies that focus on the deformability of microspheres upon dynamic adsorption have not yet been reported, most likely on account of a lack of techniques that appropriately depict the dynamic adsorption and deformation behavior of individual microspheres at the nanoscale in real time...
July 23, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28736220/manufacturing-of-hydrogel-biomaterials-with-controlled-mechanical-properties-for-tissue-engineering-applications
#3
REVIEW
Armin Vedadghavami, Farnaz Minooei, Mohammad Hossein Mohammadi, Sultan Khetani, Ahmad Rezaei, Shohreh Mashayekhan, Amir Sanati-Nezhad
Hydrogels have been recognized as crucial biomaterials in the field of tissue engineering, regenerative medicine, and drug delivery applications due to their specific characteristics. These biomaterials benefit from retaining a large amount of water, effective mass transfer, similarity to natural tissues and the ability to form different shapes. However, having relatively poor mechanical properties is a limiting factor associated with hydrogel biomaterials. Controlling the biomechanical properties of hydrogels is of paramount importance...
July 20, 2017: Acta Biomaterialia
https://www.readbyqxmd.com/read/28726576/recent-developments-in-thiolated-polymeric-hydrogels-for-tissue-engineering-applications
#4
Mani Gajendiran, Jae-Sung Rhee, Kyobum Kim
This review focuses on the recent strategy in the preparation of thiolated polymers and fabrication of their hydrogel matrices. The mechanism involved in the synthesis of thiolated polymers and fabrication of thiolated polymer hydrogels is exemplified with suitable schematic representations reported in the recent literature. The 2-iminothiolane namely "Traut's reagent" has been widely employed for effectively thiolating the natural polymers such as collagen and gelatin which contain free amino group in their back bone...
July 20, 2017: Tissue Engineering. Part B, Reviews
https://www.readbyqxmd.com/read/28726547/three-dimensional-bio-printing-of-hepatic-structures-with-direct-converted-hepatocyte-like-cells
#5
Kyojin Kang, Yohan Kim, Seung Bum Lee, Ji Sook Kim, Sua Park, Wan-Doo Kim, Heung-Mo Yang, Sung-Joo Kim, Jaemin Jeong, Dongho Choi
Three-dimensional (3D) bio-printing technology is a promising new technology in the field of bio-artificial organ generation with regard to overcoming the limitations of organ supply. The cell source for bio-printing is very important. Here, we generated 3D hepatic scaffold with mouse induced hepatocyte-like cells (miHeps), and investigated whether their function was improved after transplantation in vivo. To generate miHeps, mouse embryonic fibroblasts were transformed with pMX retroviruses individually expressing hepatic transcription factors Hnf4a and Foxa3...
July 20, 2017: Tissue Engineering. Part A
https://www.readbyqxmd.com/read/28723974/alginate-hydrogels-allow-for-bioactive-and-sustained-release-of-vegf-c-and-vegf-d-for-lymphangiogenic-therapeutic-applications
#6
Kevin T Campbell, Dustin J Hadley, David L Kukis, Eduardo A Silva
Lymphatic dysfunction is associated with the progression of many cardiovascular disorders due to their role in maintaining tissue fluid homeostasis. Promoting new lymphatic vessels (lymphangiogenesis) is a promising strategy to reverse these cardiovascular disorders via restoring lymphatic function. Vascular endothelial growth factor (VEGF) members VEGF-C and VEGF-D are both potent candidates for stimulating lymphangiogenesis, though maintaining spatial and temporal control of these factors represents a challenge to developing efficient therapeutic lymphangiogenic applications...
2017: PloS One
https://www.readbyqxmd.com/read/28721731/self-assembled-injectable-peptide-hydrogels-capable-of-triggering-antitumor-immune-response
#7
Ruirui Xing, Shukun Li, Ning Zhang, Guizhi Shen, Helmuth Möhwald, Xuehai Yan
Self-assembled peptide hydrogels are particularly appealing for drug delivery, tissue engineering, and anti-tumor therapy due to various advantageous features including excellent biocompatibility and biodegradability, defined molecular and higher organized structures and easy availability. However, the poor mechanical and rheological properties of assembled peptide hydrogels cause difficulties in injection, thus limiting further applications. Herein, injectable peptide-based hydrogels with tunable mechanical and rheological properties were obtained by combination with a positively charged poly-peptide (poly-L-lysine, PLL)...
July 19, 2017: Biomacromolecules
https://www.readbyqxmd.com/read/28720761/parylene-c-topographic-micropattern-as-a-template-for-patterning-pdms-and-polyacrylamide-hydrogel
#8
Ilaria Sanzari, Mauro Callisti, Antonio De Grazia, Daniel J Evans, Tomas Polcar, Themistoklis Prodromakis
Parylene C is a well-known polymer and it has been mainly employed as a protective layer for implantable electronics. In this paper, we propose a new approach to use Parylene C as a versatile template for patterning soft materials potentially applicable as scaffolds in cardiac tissue engineering (TE). Parylene C substrates were anisotropically patterned through standard lithographic process with hydrophilic channels separating raised hydrophobic strips. Ridges and grooves of the template are 10 µm width and depth ranging from 1 to 17 µm...
July 18, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28718807/melanin-and-melanin-related-polymers-as-materials-with-biomedical-and-biotechnological-applications-cuttlefish-ink-and-mussel-foot-proteins-as-inspired-biomolecules
#9
REVIEW
Francisco Solano
The huge development of bioengineering during the last years has boosted the search for new bioinspired materials, with tunable chemical, mechanical, and optoelectronic properties for the design of semiconductors, batteries, biosensors, imaging and therapy probes, adhesive hydrogels, tissue restoration, photoprotectors, etc. These new materials should complement or replace metallic or organic polymers that cause cytotoxicity and some adverse health effects. One of the most interesting biomaterials is melanin and synthetic melanin-related molecules...
July 18, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/28715636/backbone-engineered-%C3%AE-peptide-amphitropic-gels-for-immobilization-of-semiconductor-quantum-dots-and-2d-cell-culture
#10
Rajkumar Misra, Aman Sharma, Anjali Shiras, Hosahudya N Gopi
We are reporting a spontaneous supramolecular assembly of backbone engineered γ-peptide scaffold and its utility in the immobilization of semiconductor quantum dots and in cell culture. The stimulating feature of this γ-peptide scaffold is that it efficiently gelate both aqueous phosphate buffers as well as aromatic organic solvents. A comparative and systematic investigation reveals that the greater spontaneous self-aggregation property of γ-peptide over the α-, and β-peptide analogues is mainly due to the backbone flexibility, increased hydrophobicity and "π-π stacking of γ-phenylalanine residues...
July 17, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28715312/new-directions-for-treating-bleeding-disorders-from-tests-for-platelet-strength-to-malleable-hydrogel-research-is-advancing-understanding-diagnosis-and-treatment-of-this-difficult-condition
#11
Mary Bates
Most people don't worry about small cuts or wounds, because their bodies form clots to stop the bleeding. This process, called coagulation or hemostasis, requires certain blood cells, platelets, and protein clotting factors to interact correctly and form a clot to stanch the bleeding and begin repair of the damaged blood vessel.
July 2017: IEEE Pulse
https://www.readbyqxmd.com/read/28714308/supersensitive-oxidation-responsive-biodegradable-peg-hydrogels-for-glucose-triggered-insulin-delivery
#12
Mei Zhang, Cheng-Cheng Song, Fu-Sheng Du, Zi-Chen Li
Reactive oxygen species (ROS)-responsive polymers and hydrogels represent an emerging family of intelligent materials owing to the key functions of ROS in physiological processes or pathological diseases. Nonetheless, the weaknesses such as low sensitivity, slow response, instability, or low mechanical strength are associated with the limited ROS-responsive polymeric or supramolecular hydrogels. In this study, a novel type of oxidation-responsive degradable hydrogels was fabricated by the redox initiated radical polymerization of a 4-arm-PEG acrylic macromonomer that possesses an H2O2-cleavable phenylboronic acid linker in each of the arms...
July 17, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28714139/simple-radical-polymerization-of-poly-alginate-graft-n-isopropylacrylamide-injectable-thermoresponsive-hydrogel-with-the-potential-for-localized-and-sustained-delivery-of-stem-cells-and-bioactive-molecules
#13
Sreekanth Pentlavalli, Philip Chambers, Binulal N Sathy, Michelle O'Doherty, Marine Chalanqui, Daniel J Kelly, Tammy Haut-Donahue, Helen O McCarthy, Nicholas J Dunne
In this study, thermoresponsive copolymers that are fully injectable, biocompatible, and biodegradable and are synthesized via graft copolymerization of poly(N-isopropylacrylamide) onto alginate using a free-radical reaction are presented. This new synthesis method does not involve multisteps or associated toxicity issues, and has the potential to reduce scale-up difficulties. Chemical and physical analyses verify the resultant graft copolymer structure. The lower critical solution temperature, which is a characteristic of sol-gel transition, is observed at 32 °C...
July 17, 2017: Macromolecular Bioscience
https://www.readbyqxmd.com/read/28709910/silicon-zinc-glycerol-hydrogel-a-potential-immunotropic-agent-for-topical-application
#14
Tat'yana G Khonina, Maria V Ivanenko, Oleg N Chupakhin, Alexander P Safronov, Ekaterina A Bogdanova, Maxim S Karabanalov, Vasily V Permikin, Leonid P Larionov, Lyudmila I Drozdova
Nanoparticles synthesized using sol-gel method are promising agents for biomedical applications, in particular for the therapy and diagnosis of various diseases. Using silicon and zinc glycerolates as biocompatible precursors we synthesized by the sol-gel method a new bioactive silicon-zinc-containing glycerohydrogel combining the positive pharmacological properties of the precursors. In the present work the structural features of silicon-zinc-containing glycerohydrogel and its immunotropic properties were studied...
July 12, 2017: European Journal of Pharmaceutical Sciences
https://www.readbyqxmd.com/read/28702976/a-new-hyaluronic-acid-polymer-in-the-augmentation-and-restoration-of-labia-majora
#15
N Zerbinati, R G Haddad, A Bader, R Rauso, E D'Este, G Cipolla, A Calligaro, P Gonzalez, S Salvatore, D Serafin
Aesthetic surgery of female external genitalia has gained increasing popularity over the past decade, with reduction of the labia minora (labiaplasty) being the procedure most commonly requested and performed. Female external genitalia lose elasticity and volume with age, but few studies describe the techniques for labia majora augmentation. Currently, very few studies have investigated the effectiveness and safety of labia majora augmentation with hyaluronic acid (HA) injection. This study aims to evaluate the effectiveness and safety of labia majora augmentation with hyaluronic acid filler injection...
July 13, 2017: Journal of Biological Regulators and Homeostatic Agents
https://www.readbyqxmd.com/read/28702374/topical-application-of-0-5-timolol-maleate-hydrogel-for-the-treatment-of-superficial-infantile-hemangioma
#16
Hai Wei Wu, Chao Liu, Xuan Wang, Ling Zhang, Weien Yuan, Jia Wei Zheng, Li Xin Su, Xin Dong Fan
The therapeutic options for infantile hemangiomas (IHs) have been greatly altered since the introduction of oral propranolol for successful treatments of IHs. Recently, there is an increase in the application of topical timolol maleate for treating superficial IHs. In the present study, we developed a new formulation of timolol maleate 0.5% hydrogel and treated 321 patients with superficial IHs to evaluate its efficacy and safety in the treatment of superficial IHs. This new timolol hydrogel was applied three times daily with a mean duration of 7...
2017: Frontiers in Oncology
https://www.readbyqxmd.com/read/28700254/diquafosol-delivery-from-silicone-hydrogel-contact-lenses-improved-effect-on-tear-secretion
#17
Carmen Dominguez-Godinez, Gonzalo Carracedo, Jesus Pintor
PURPOSE: The aim of this study was to evaluate the ability to uptake and to deliver diquafosol from commercial contact lenses (CLs) and its effect on tear secretion. METHODS: For both in vitro and in vivo experiments, two commercial silicone hydrogel (Si-Hy) CLs (comfilcon A and balafilcon A) were used. The CLs were soaked overnight for 12 h in diquafosol solution and control CLs were soaked in saline solution (NaCl 0.9%). The CLs were introduced into a new well container with 1 mL of saline solution, and aliquots of 100 μL were extracted at different times during a period of 6 h to measure the diquafosol release...
July 12, 2017: Journal of Ocular Pharmacology and Therapeutics
https://www.readbyqxmd.com/read/28699619/highly-defined-3d-printed-chitosan-scaffolds-featuring-improved-cell-growth
#18
Lisa Elviri, Ruben Foresti, Carlo Bergonzi, Francesca Zimetti, Cinzia Marchi, Annalisa Bianchera, Franco Bernini, Marco Silvestri, Ruggero Bettini
The augmented demand for medical devices devoted to tissue regeneration and possessing a controlled micro-architecture means there is a need for industrial scale-up in the production of hydrogels. A new 3D printing technique was applied to the automation of a freeze-gelation method for the preparation of chitosan scaffolds with controlled porosity. For this aim, a dedicated 3D printer was built in-house: a preliminary effort has been necessary to explore the printing parameter space to optimize the printing results in terms of geometry, tolerances and mechanical properties of the product...
July 12, 2017: Biomedical Materials
https://www.readbyqxmd.com/read/28699526/hydrogel-based-cell-therapies-for-kidney-regeneration-current-trends-in-biofabrication-and-in-vivo-repair
#19
Katja Jansen, Carl C L Schuurmans, Jitske Jansen, Rosalinde Masereeuw, Tina Vermonden
Facing the problems of limited renal regeneration capacity and the persistent shortage of donor kidneys, dialysis remains the only treatment option for many end-stage renal disease patients. Unfortunately, dialysis is only a medium-term solution because large and protein-bound uremic solutes are not efficiently cleared from the body and lead to disease progression over time. Current strategies for improved renal replacement therapies (RRTs) range from whole organ engineering to biofabrication of renal assist devices and biological injectables for in vivo regeneration...
July 10, 2017: Current Pharmaceutical Design
https://www.readbyqxmd.com/read/28698817/the-fabrication-of-biomimetic-biphasic-can-pac-hydrogel-with-a-seamless-interfacial-layer-applied-in-osteochondral-defect-repair
#20
Jinfeng Liao, Taoran Tian, Sirong Shi, Xueping Xie, Quanquan Ma, Guo Li, Yunfeng Lin
Cartilage tissue engineering based on biomimetic scaffolds has become a rapidly developing strategy for repairing cartilage defects. In this study, a biphasic CAN-PAC hydrogel for osteochondral defect (OCD) regeneration was fabricated based on the density difference between the two layers via a thermally reactive, rapid cross-linking method. The upper hydrogel was cross-linked by CSMA and NIPAm, and the lower hydrogel was composed of PECDA, AAm and PEGDA. The interface between the two layers was first grafted by the physical cross-linking of calcium gluconate and alginate, followed by the chemical cross-linking of the carbon-carbon double bonds in the other components...
2017: Bone Research
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