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Injectable hydrogels

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https://www.readbyqxmd.com/read/29691829/in-situ-cross-linkable-polymer-systems-and-composites-for-osteochondral-regeneration
#1
María Puertas-Bartolomé, Lorena Benito-Garzón, Marta Olmeda-Lozano
Injectable hydrogels have demonstrated being a promising strategy for cartilage and bone tissue engineering applications, owing to their minimal invasive injection procedure, easy incorporation of cells and bioactive molecules, improved contact with the surrounding tissues and ability to match defects with complex irregular shapes, characteristics of osteoarthritic pathology. These unique properties make them highly suitable bioscaffolds for treating defects which are otherwise not easily accessible without and invasive surgical procedure...
2018: Advances in Experimental Medicine and Biology
https://www.readbyqxmd.com/read/29691026/strengthening-injectable-thermo-sensitive-nipaam-g-chitosan-hydrogels-using-chemical-cross-linking-of-disulfide-bonds-as-scaffolds-for-tissue-engineering
#2
Shu-Wei Wu, Xifeng Liu, A Lee Miller, Yu-Shiuan Cheng, Ming-Long Yeh, Lichun Lu
In the present study, we fabricated non-toxic, injectable, and thermo-sensitive NIPAAm-g-chitosan (NC) hydrogels with thiol modification for introduction of disulfide cross-linking strategy. Previously, NIPAAm and chitosan copolymer has been proven to have excellent biocompatibility, biodegradability and rapid phase transition after injection, suitable to serve as cell carriers or implanted scaffolds. However, weak mechanical properties significantly limit their potential for biomedical fields. In order to overcome this issue, we incorporated thiol side chains into chitosan by covalently conjugating N-acetyl-cysteine (NAC) with carbodiimide chemistry to strengthen mechanical properties...
July 15, 2018: Carbohydrate Polymers
https://www.readbyqxmd.com/read/29691000/thermosensitive-and-photocrosslinkable-hydroxypropyl-chitin-based-hydrogels-for-biomedical-applications
#3
Meng Yuan, Bo Bi, Jiachang Huang, Renxi Zhuo, Xulin Jiang
In situ forming injectable hydrogels based on thermosensitive polymers are being investigated for tissue engineering applications. However, the major limitations of this kind of hydrogels are low gel stability and weak mechanical properties under physiological conditions. Here, thermosensitive hydroxypropyl chitin (HPCH) was synthesized homogenously and subsequently functionalized with photocrosslinkable methacrylate groups via glycidyl methacrylate to generate glycidyl methacrylate-modified HPCH (GM-HPCH)...
July 15, 2018: Carbohydrate Polymers
https://www.readbyqxmd.com/read/29687955/optimization-of-ca-2-content-in-alginate-hydrogel-injected-in-myocardium
#4
Eleonora Barka, Demetrios K Papayannis, Theofilos M Kolettis, Simeon Agathopoulos
The spontaneous uptake of Ca2+ -ions is a unique property of alginate hydrogels, which, along with their high biocompatibility, disintegration (approximately within 2 weeks), and morphological similarity to heart tissue, makes them attractive as scaffolding materials in therapies in infarct myocardium. To shed light on the aforementioned ability, thorough theoretical calculations were carried out with the density functional theory (DFT) method. The influence of Ca-content οn the molecular structure and the thermodynamic stability of the alginate hydrogel was determined; what is more, these results effectively interpreted the experimental findings, as well...
April 24, 2018: Journal of Biomedical Materials Research. Part B, Applied Biomaterials
https://www.readbyqxmd.com/read/29686999/influence-of-drug-carrier-polymers-on-alpha-synucleinopathies-a-neglected-aspect-in-new-therapies-development
#5
C Tonda-Turo, M Herva, V Chiono, G Ciardelli, M G Spillantini
Current therapeutic strategies to treat neurodegenerative diseases, such as alpha-synucleinopathies, aim at enhancing the amount of drug reaching the brain. Methods proposed, such as intranasal administration, should be able to bypass the blood brain barrier (BBB) and even when directly intracerebrally injected they could require a carrier to enhance local release of drugs. We have investigated the effect of a model synthetic hydrogel to be used as drug carrier on the amount of alpha-synuclein aggregates in cells in culture...
2018: BioMed Research International
https://www.readbyqxmd.com/read/29684624/component-effect-of-stem-cell-loaded-thermosensitive-polypeptide-hydrogels-on-cartilage-repair
#6
He Liu, Yilong Cheng, Jinjin Chen, Fei Chang, Jincheng Wang, Jianxun Ding, Xuesi Chen
Biophysical properties of the desired biomimetic scaffolds, such as porosity and elasticity, have been proven associated with the efficacy of cartilage regeneration. In this work, the copolymers of poly(L-alanine)-block-poly(ethylene glycol)-block-poly(L-alanine) (PA-PEG-PA) and poly(L-alanine-co-L-phenylalanine)-block-poly(ethylene glycol)-block-poly(L-alanine-co-L-phenylalanine) (PAF-PEG-PAF) with different ratios of alanine to phenylalanine were synthesized. The introduction of a hydrophobic amino acid, phenylalanine, into polyalanine-based thermosensitive hydrogel leaded to the enhanced gelation behaviors and upregulated mechanical properties...
April 20, 2018: Acta Biomaterialia
https://www.readbyqxmd.com/read/29684622/injectable-drug-depot-engineered-to-release-multiple-ophthalmic-therapeutic-agents-with-precise-time-profiles-for-postoperative-treatment-following-ocular-surgery
#7
Maziar Mohammadi, Kisha Patel, Seyedeh P Alaie, Ron B Shmueli, Cagri G Besirli, Ronald G Larson, Jordan J Green
A multi-drug delivery platform is developed to address current shortcomings of post-operative ocular drug delivery. The sustained biodegradable drug release system is composed of biodegradable polymeric microparticles (MPs) incorporated into a bulk biodegradable hydrogel made from triblock copolymers with poly(ethylene glycol) (PEG) center blocks and hydrophobic biodegradable polyester blocks such as poly(lactide-co-glycolide) (PLGA), Poly(lactic acid) (PLA), or Poly(lactide-co-caprolactone) (PLCL) blocks. This system is engineered to flow as a liquid solution at room temperature for facile injection into the eye and then quickly gel as it warms to physiological body temperatures (approximately 37 °C)...
April 20, 2018: Acta Biomaterialia
https://www.readbyqxmd.com/read/29682801/dynamic-hyaluronan-hydrogels-with-temporally-modulated-high-injectability-and-stability-using-a-biocompatible-catalyst
#8
Junzhe Lou, Fang Liu, Christopher D Lindsay, Ovijit Chaudhuri, Sarah C Heilshorn, Yan Xia
Injectable and biocompatible hydrogels have become increasingly important for cell transplantation to provide mechanical protection of cells during injection and a stable scaffold for cell adhesion post-injection. Injectable hydrogels need to be easily pushed through a syringe needle and quickly recover to a gel state, thus generally requiring noncovalent or dynamic cross-linking. However, a dilemma exists in the design of dynamic hydrogels: hydrogels with fast exchange of cross-links are easier to eject using less force, but lack long-term stability; in contrast, slow exchange of cross-links improves stability, but compromises injectability and thus the ability to protect cells under flow...
April 23, 2018: Advanced Materials
https://www.readbyqxmd.com/read/29680252/demonstration-of-safety-and-feasibility-of-hydrogel-marking-of-the-pancreas-duodenum-interface-for-image-guided-radiation-therapy-igrt-in-a-porcine-model-implications-in-igrt-for-pancreatic-cancer-patients
#9
Avani D Rao, Eun Ji Shin, Sarah E Beck, Caroline Garrett, Seong-Hun Kim, Nam Ju Lee, Eleni Liapi, John Wong, Joseph Herman, Amol Narang, Kai Ding
PURPOSE: To test the feasibility and safety of injecting a high-contrast hydrogel marker at the head of the pancreas (HOP) and duodenum interface and assesses the marker visibility on cone beam computed tomography (CBCT) to localize this important boundary during image guided radiation therapy in a porcine model. METHODS AND MATERIALS: This was a 2-stage study. The feasibility/visibility stage evaluated the ability to place the hydrogel using endoscopic ultrasound guidance on 8 swine (4 euthanized at post-injection day 8, 4 euthanized at post-injection day 22) and assessed the quality of visibility of the marked location on CBCT in the longer-surviving group...
March 2, 2018: International Journal of Radiation Oncology, Biology, Physics
https://www.readbyqxmd.com/read/29677369/targeted-drug-delivery-in-the-suprachoroidal-space-by-swollen-hydrogel-pushing
#10
Jae Hwan Jung, Patcharin Desit, Mark R Prausnitz
Purpose: The purpose is to target model drug particles to the posterior region of the suprachoroidal space (SCS) of the eye controlled via pushing by hydrogel swelling. Methods: A particle formulation containing 1% hyaluronic acid (HA) with fluorescent polymer particles and a hydrogel formulation containing 4% HA were introduced in a single syringe as two layers without mixing, and injected sequentially into the SCS of the rabbit eye ex vivo and in vivo using a microneedle...
April 1, 2018: Investigative Ophthalmology & Visual Science
https://www.readbyqxmd.com/read/29661307/effect-of-ph-and-precursor-salts-on-in-situ-formation-of-calcium-phosphate-nanoparticles-in-methylcellulose-hydrogel
#11
Min Hee Kim, Hanna Park, Won Ho Park
Thermo-reversible hydrogels have been widely studied in biomedical research fields, because of their potential performance in drug delivery and tissue engineering. In this study, a novel thermo-sensitive methylcellulose (MC) hydrogel based on calcium phosphate nanoparticles (CaP NPs) was prepared by in situ formation process in which precursor salts induced a salt-out effect in the MC solution. Based on the Hofmeister series, CaCl2 , Na2 HPO4 , and NaH2 PO4 precursor salts with a good salt-out effect were used as the precursor salts for CaP NPs...
July 1, 2018: Carbohydrate Polymers
https://www.readbyqxmd.com/read/29660509/glycosylation-enhanced-biocompatibility-of-the-supramolecular-hydrogel-of-an-anti-inflammatory-drug-for-topical-suppression-of-inflammation
#12
Taotao Xiong, Xianglian Li, Yanfang Zhou, Qianqian Song, Renshu Zhang, Lei Lei, Xingyi Li
Intravitreal/periocular injection of triamcinolone acetonide (TA) suspension is a common uveitis treatment, but it displays a high risk for serious side effects (e.g., high intraocular pressure, retinal toxicity). We report here an intravitreally injectable thermosensitive glycosylated TA (TA-SA-Glu) hydrogel, formed by covalently conjugating glucosamine (Glu) with succinate TA (TA-SA), for treating uveitis. The TA-SA-Glu hydrogelator forms a supramolecular hydrogel spontaneously in aqueous solution with a minimal gelation concentration of 0...
April 13, 2018: Acta Biomaterialia
https://www.readbyqxmd.com/read/29660456/chitosan-based-hydrogels-preparation-properties-and-applications
#13
Zahra Shariatinia, Azin Mazloom Jalali
Chitosan (CS), the second most plentiful natural polysaccharide next to cellulose, has valuable characteristics including biocompatibility, nontoxicity and biodegradability. CS is broken down in the human body to innocuous products (amino sugars). Hydrogels are polymeric materials with three dimensional networks retaining a huge quantity of water within their structures which are of great interest in biomedical/environmental applications. Usually, injectable hydrogels have functional groups which are sensitive to pH, temperature or irradiation stimuli...
April 13, 2018: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/29659011/immune-system-augmentation-via-humanization-using-stem-progenitor-cells-and-bioengineering-in-a-breast-cancer-model-study
#14
Abbas Shafiee, Jacqui A McGovern, Christoph A Lahr, Christoph Meinert, Davide Moi, Ferdinand Wagner, Marietta Landgraf, Elena De-Juan-Pardo, Roberta Mazzieri, Dietmar W Hutmacher
Despite significant advances, most current in vivo models fail to fully recapitulate the biological processes that occur in humans. Here we aimed to develop an advanced humanized model with features of an organ bone by providing different bone tissue cellular compartments including pre-osteoblasts, mesenchymal stem/stromal (MSCs), endothelial and hematopoietic cells in an engineered microenvironment. The bone compartment was generated by culturing the human MSCs, umbilical vein endothelial cells with gelatin methacryloyl hydrogels in the centre of a melt-electrospun polycaprolactone tubular scaffolds which were seeded with human pre-osteoblasts...
April 16, 2018: International Journal of Cancer. Journal International du Cancer
https://www.readbyqxmd.com/read/29658175/mri-visualization-of-injectable-ureidopyrimidinone-hydrogelators-by-supramolecular-contrast-agent-labeling
#15
Maarten H Bakker, Cheyenne C S Tseng, Henk M Keizer, Peter R Seevinck, Henk M Janssen, Frebus J Van Slochteren, Steven A J Chamuleau, Patricia Y W Dankers
Information about the in vivo location, shape, degradation, or erosion rate of injected in situ gelating hydrogels can be obtained with magnetic resonance imaging (MRI). Herein, an injectable supramolecular ureidopyrimidinone-based hydrogel (UPy-PEG) is functionalized with a modified Gadolinium(III)-DOTA complex (UPy-Gd) for contrast enhanced MRI. The contrast agent is designed to supramolecularly interact with the hydrogel network to enable high-quality imaging of this hydrogel. The applicability of the approach is demonstrated with successful visualization of the Gd-labeled UPy-PEG hydrogel after targeted intramyocardial catheter injection in a pig heart...
April 15, 2018: Advanced Healthcare Materials
https://www.readbyqxmd.com/read/29657091/injectable-polypeptide-hydrogels-via-methionine-modification-for-neural-stem-cell-delivery
#16
A L Wollenberg, T M O'Shea, J H Kim, A Czechanski, L G Reinholdt, M V Sofroniew, T J Deming
Injectable hydrogels with tunable physiochemical and biological properties are potential tools for improving neural stem/progenitor cell (NSPC) transplantation to treat central nervous system (CNS) injury and disease. Here, we developed injectable diblock copolypeptide hydrogels (DCH) for NSPC transplantation that contain hydrophilic segments of modified l-methionine (Met). Multiple Met-based DCH were fabricated by post-polymerization modification of Met to various functional derivatives, and incorporation of different amino acid comonomers into hydrophilic segments...
April 5, 2018: Biomaterials
https://www.readbyqxmd.com/read/29649634/injectable-porous-biohybrid-hydrogels-incorporating-decellularized-tissue-components-for-soft-tissue-applications
#17
Yang Zhu, Sato Hideyoshi, Hongbin Jiang, Yasumoto Matsumura, Jenna L Dziki, Samuel T LoPresti, Luai Huleihel, Gabriela N F Faria, Leah C Fuhrman, Ricardo Lodono, Stephen F Badylak, William R Wagner
Biodegradable injectable hydrogels have been extensively studied and evaluated in various medical applications such as for bulking agents, drug delivery reservoirs, temporary barriers, adhesives, and cell delivery matrices. Where injectable hydrogels are intended to facilitate a healing response, it may be desirable to encourage rapid cellular infiltration into the hydrogel volume from the tissue surrounding the injection site. In this study, we developed a platform technique to rapidly form pores in a thermally responsive injectable hydrogel, poly(NIPAAm-co-VP-co-MAPLA) by using mannitol particles as porogens...
April 9, 2018: Acta Biomaterialia
https://www.readbyqxmd.com/read/29644843/non-covalently-assembled-electroconductive-hydrogel
#18
Yong Xu, Xuegeng Yang, Alvin Kuriakose Thomas, Panagiotis A Patsis, Thomas Kurth, Martin Kraeter, Kerstin Eckert, Martin Bornhauser, Yixin Zhang
To crosslink biomolecules with electroconductive nanostructures through non-covalent interaction can result in modular networks with defined biological functions and physical properties such as electric conductivity and viscoelasticity. Moreover, the resulting matrices can exhibit interesting features caused by the dynamic assembling process, such as self-healing and molecular ordering. In this paper, we present a physical hydrogel system formed by mixing peptide-polyethylene glycol (peptide-PEG) and poly(3,4-ethylenedioxythiophene) polystyrene sulfonate (PEDOT:PSS)...
April 12, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29644098/hydrogel-based-scaffolds-to-support-intrathecal-stem-cell-transplantation-as-a-gateway-to-the-spinal-cord-clinical-needs-biomaterials-and-imaging-technologies
#19
REVIEW
J Miguel Oliveira, Luisa Carvalho, Joana Silva-Correia, Sílvia Vieira, Malgorzata Majchrzak, Barbara Lukomska, Luiza Stanaszek, Paulina Strymecka, Izabela Malysz-Cymborska, Dominika Golubczyk, Lukasz Kalkowski, Rui L Reis, Miroslaw Janowski, Piotr Walczak
The prospects for cell replacement in spinal cord diseases are impeded by inefficient stem cell delivery. The deep location of the spinal cord and complex surgical access, as well as densely packed vital structures, question the feasibility of the widespread use of multiple spinal cord punctures to inject stem cells. Disorders characterized by disseminated pathology are particularly appealing for the distribution of cells globally throughout the spinal cord in a minimally invasive fashion. The intrathecal space, with access to a relatively large surface area along the spinal cord, is an attractive route for global stem cell delivery, and, indeed, is highly promising, but the success of this approach relies on the ability of cells (1) to survive in the cerebrospinal fluid (CSF), (2) to adhere to the spinal cord surface, and (3) to migrate, ultimately, into the parenchyma...
2018: NPJ Regenerative Medicine
https://www.readbyqxmd.com/read/29628260/injectable-self-crosslinking-ha-sh-col-i-blend-hydrogels-for-in-vitro-construction-of-engineered-cartilage
#20
Yafang Chen, Junhui Sui, Qing Wang, Yijia Yin, Jun Liu, Qiguang Wang, Xianglong Han, Yong Sun, Yujiang Fan, Xingdong Zhang
The injectable self-crosslinking blend hydrogel by combination of collagen I and thiolated hyaluronic acid could alleviate collagen I contraction in vitro and overcome weak cell adhesive sites of hyaluronic acid. Five groups of injectable hydrogels with different ratios were prepared to investigate their gelation time, injection force, mechanical properties, swelling capacity and disintegration performance. These results indicated that Col7 HA-SH3 hydrogel achieved the optimal controlled and injectable effect, the gelation time was just ten seconds with injection force at 3...
June 15, 2018: Carbohydrate Polymers
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