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Biomaterials

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https://www.readbyqxmd.com/read/28651144/improved-anticancer-effects-of-albumin-bound-paclitaxel-nanoparticle-via-augmentation-of-epr-effect-and-albumin-protein-interactions-using-s-nitrosated-human-serum-albumin-dimer
#1
Ryo Kinoshita, Yu Ishima, Victor T G Chuang, Hideaki Nakamura, Jun Fang, Hiroshi Watanabe, Taro Shimizu, Keiichiro Okuhira, Tatsuhiro Ishida, Hiroshi Maeda, Masaki Otagiri, Toru Maruyama
In the latest trend of anticancer chemotherapy research, there were many macromolecular anticancer drugs developed based on enhanced permeability and retention (EPR) effect, such as albumin bound paclitaxel nanoparticle (nab- PTX, also called Abraxane(®)). However, cancers with low vascular permeability posed a challenge for these EPR based therapeutic systems. Augmenting the intrinsic EPR effect with an intrinsic vascular modulator such as nitric oxide (NO) could be a promising strategy. S-nitrosated human serum albumin dimer (SNO-HSA Dimer) shown promising activity previously was evaluated for the synergistic effect when used as a pretreatment agent in nab-PTX therapy against various tumor models...
June 22, 2017: Biomaterials
https://www.readbyqxmd.com/read/28649014/apatite-nanoparticles-strongly-improve-red-blood-cell-cryopreservation-by-mediating-trehalose-delivery-via-enhanced-membrane-permeation
#2
Martin Stefanic, Kevin Ward, Harvey Tawfik, Ralf Seemann, Vladimir Baulin, Yachong Guo, Jean-Baptiste Fleury, Christophe Drouet
Cryopreservation of red blood cells (RBC) is an important method for maintaining an inventory of rare RBC units and managing special transfusion circumstances. Currently, in a clinical setting, glycerol is used as cryoprotectant against freezing damage. After thawing and before transfusion, glycerol must however be removed to avoid intravascular hemolysis, via a complex and time-consuming deglycerolization process which requires specialized equipment. Improved cryopreservation methods using non-toxic agents are required to increase biocompatibility and decrease processing time...
June 18, 2017: Biomaterials
https://www.readbyqxmd.com/read/28644976/biomaterials-that-promote-cell-cell-interactions-enhance-the-paracrine-function-of-mscs
#3
Taimoor H Qazi, David J Mooney, Georg N Duda, Sven Geissler
Mesenchymal stromal cells (MSCs) secrete paracrine factors that play crucial roles during tissue regeneration. Whether this paracrine function is influenced by the properties of biomaterials in general, and those used for cell delivery in particular, largely remains unexplored. Here, we investigated if three-dimensional culture in distinct microenvironments - nanoporous hydrogels (mean pore size ∼5 nm) and macroporous scaffolds (mean pore size ∼120 μm) - affects the secretion pattern of MSCs, and consequently leads to differential paracrine effects on target progenitor cells such as myoblasts...
June 18, 2017: Biomaterials
https://www.readbyqxmd.com/read/28633046/macrophages-with-cellular-backpacks-for-targeted-drug-delivery-to-the-brain
#4
Natalia L Klyachko, Roberta Polak, Matthew J Haney, Yuling Zhao, Reginaldo J Gomes Neto, Michael C Hill, Alexander V Kabanov, Robert E Cohen, Michael F Rubner, Elena V Batrakova
Most potent therapeutics are unable to cross the blood-brain barrier following systemic administration, which necessitates the development of unconventional, clinically applicable drug delivery systems. With the given challenges, biologically active vehicles are crucial to accomplishing this task. We now report a new method for drug delivery that utilizes living cells as vehicles for drug carriage across the blood brain barrier. Cellular backpacks, 7-10 μm diameter polymer patches of a few hundred nanometers in thickness, are a potentially interesting approach, because they can act as drug depots that travel with the cell-carrier, without being phagocytized...
June 17, 2017: Biomaterials
https://www.readbyqxmd.com/read/28649015/on-command-on-off-switching-of-progenitor-cell-and-cancer-cell-polarized-motility-and-aligned-morphology-via-a-cytocompatible-shape-memory-polymer-scaffold
#5
Jing Wang, Andy Quach, Megan E Brasch, Christopher E Turner, James H Henderson
In vitro biomaterial models have enabled advances in understanding the role of extracellular matrix (ECM) architecture in the control of cell motility and polarity. Most models are, however, static and cannot mimic dynamic aspects of in vivo ECM remodeling and function. To address this limitation, we present an electrospun shape memory polymer scaffold that can change fiber alignment on command under cytocompatible conditions. Cellular response was studied using the human fibrosarcoma cell line HT-1080 and the murine mesenchymal stem cell line C3H/10T1/2...
June 14, 2017: Biomaterials
https://www.readbyqxmd.com/read/28649013/online-quantitative-monitoring-of-live-cell-engineered-cartilage-growth-using-diffuse-fiber-optic-raman-spectroscopy
#6
Mads S Bergholt, Michael B Albro, Molly M Stevens
Tissue engineering (TE) has the potential to improve the outcome for patients with osteoarthritis (OA). The successful clinical translation of this technique as part of a therapy requires the ability to measure extracellular matrix (ECM) production of engineered tissues in vitro, in order to ensure quality control and improve the likelihood of tissue survival upon implantation. Conventional techniques for assessing the ECM content of engineered cartilage, such as biochemical assays and histological staining are inherently destructive...
June 14, 2017: Biomaterials
https://www.readbyqxmd.com/read/28624706/bilirubin-nanoparticles-ameliorate-allergic-lung-inflammation-in-a-mouse-model-of-asthma
#7
Dong Eon Kim, Yonghyun Lee, MinGyo Kim, Soyoung Lee, Sangyong Jon, Seung-Hyo Lee
Although asthma, a chronic inflammatory airway disease, is relatively well-managed by inhaled corticosteroids, the side effects associated with the long-term use of these agents precipitate the need for alternative therapeutic options based on differing modes of action. Bilirubin, a potent endogenous antioxidant, and anti-inflammatory molecule have been shown to ameliorate asthmatic symptoms; however, its clinical translation has been limited owing to its water insolubility and associated potential toxicity...
June 12, 2017: Biomaterials
https://www.readbyqxmd.com/read/28628777/effects-of-adipose-stem-cell-sheets-on-colon-anastomotic-leakage-in-an-experimental-model-proof-of-principle
#8
Panithi Sukho, Geesien S A Boersema, Abigael Cohen, Nicole Kops, Johan F Lange, Jolle Kirpensteijn, Jan Willem Hesselink, Yvonne M Bastiaansen-Jenniskens, Femke Verseijden
The most dreaded complication of colorectal surgery is anastomotic leakage. Adipose tissue-derived stem cell sheets (ASC sheets) prepared from temperature-responsive culture surfaces can be easily transplanted onto tissues. These sheets are proposed to improve cell transplant efficiency and enhance wound healing. The aim of this study was to investigate whether application of ASC sheets could prevent leakage of sutured colorectal anastomoses. Insufficient suturing of colorectal anastomoses was performed in Wistar rats to create a colorectal anastomotic leakage model...
June 9, 2017: Biomaterials
https://www.readbyqxmd.com/read/28624707/substrate-stiffness-and-ve-cadherin-mechano-transduction-coordinate-to-regulate-endothelial-monolayer-integrity
#9
Roberto C Andresen Eguiluz, Kerim B Kaylan, Gregory H Underhill, Deborah E Leckband
The vascular endothelium is subject to diverse mechanical cues that regulate vascular endothelial barrier function. In addition to rigidity sensing through integrin adhesions, mechanical perturbations such as changes in fluid shear stress can also activate force transduction signals at intercellular junctions. This study investigated how extracellular matrix rigidity and intercellular force transduction, activated by vascular endothelial cadherin, coordinate to regulate the integrity of endothelial monolayers...
June 9, 2017: Biomaterials
https://www.readbyqxmd.com/read/28624705/controlled-release-of-basic-fibroblast-growth-factor-for-angiogenesis-using-acoustically-responsive-scaffolds
#10
Alexander Moncion, Melissa Lin, Eric G O'Neill, Renny T Franceschi, Oliver D Kripfgans, Andrew J Putnam, Mario L Fabiilli
The clinical translation of pro-angiogenic growth factors for treatment of vascular disease has remained a challenge due to safety and efficacy concerns. Various approaches have been used to design spatiotemporally-controlled delivery systems for growth factors in order to recapitulate aspects of endogenous signaling and thus assist in translation. We have developed acoustically-responsive scaffolds (ARSs), which are fibrin scaffolds doped with a payload-containing, sonosensitive emulsion. Payload release can be controlled non-invasively and in an on-demand manner using focused, megahertz-range ultrasound (US)...
June 9, 2017: Biomaterials
https://www.readbyqxmd.com/read/28623721/macrophage-phenotypic-mechanomodulation-of-enhancing-bone-regeneration-by-superparamagnetic-scaffold-upon-magnetization
#11
Suisui Hao, Jie Meng, Yu Zhang, Jian Liu, Xin Nie, Fengxin Wu, Yanlian Yang, Chen Wang, Ning Gu, Haiyan Xu
Macrophages are involved in all phases of scaffold induced tissue regeneration, orchestrating the transition from an inflammatory to regenerative phenotype to guide all other cell types to complete the wound healing process when a tissue defect advances beyond the critical size. Therefore, harnessing macrophages by scaffolds is important for facilitating tissue regeneration in situ. In this work we utilized the superparamagnetic scaffold upon magnetization as a mechanostimulation platform to apply forces directly to macrophages grown in the scaffold, aiming to figure out whether the functions of macrophages related to bone tissue regeneration can be mechanomodulated and to elucidate the underlying mechanisms...
June 9, 2017: Biomaterials
https://www.readbyqxmd.com/read/28628776/3d-printed-lattices-as-an-activation-and-expansion-platform-for-t-cell-therapy
#12
Bahman Delalat, Frances Harding, Batjargal Gundsambuu, Elena M De-Juan-Pardo, Felix M Wunner, Marie-Luise Wille, Marek Jasieniak, Kristen A L Malatesta, Hans J Griesser, Antonio Simula, Dietmar W Hutmacher, Nicolas H Voelcker, Simon C Barry
One of the most significant hurdles to the affordable, accessible delivery of cell therapy is the cost and difficulty of expanding cells to clinically relevant numbers. Immunotherapy to prevent autoimmune disease, tolerate organ transplants or target cancer critically relies on the expansion of specialized T cell populations. We have designed 3D-printed cell culture lattices with highly organized micron-scale architectures, functionalized via plasma polymerization to bind monoclonal antibodies that trigger cell proliferation...
June 7, 2017: Biomaterials
https://www.readbyqxmd.com/read/28651145/polymer-structure-property-requirements-for-stereolithographic-3d-printing-of-soft-tissue-engineering-scaffolds
#13
REVIEW
Ryan J Mondschein, Akanksha Kanitkar, Christopher B Williams, Scott S Verbridge, Timothy E Long
This review highlights the synthesis, properties, and advanced applications of synthetic and natural polymers 3D printed using stereolithography for soft tissue engineering applications. Soft tissue scaffolds are of great interest due to the number of musculoskeletal, cardiovascular, and connective tissue injuries and replacements humans face each year. Accurately replacing or repairing these tissues is challenging due to the variation in size, shape, and strength of different types of soft tissue. With advancing processing techniques such as stereolithography, control of scaffold resolution down to the μm scale is achievable along with the ability to customize each fabricated scaffold to match the targeted replacement tissue...
June 6, 2017: Biomaterials
https://www.readbyqxmd.com/read/28646685/a-highly-adhesive-and-naturally-derived-sealant
#14
Alexander Assmann, Andrea Vegh, Mohammad Ghasemi-Rad, Sara Bagherifard, George Cheng, Ehsan Shirzaei Sani, Guillermo U Ruiz-Esparza, Iman Noshadi, Antonio D Lassaletta, Sidhu Gangadharan, Ali Tamayol, Ali Khademhosseini, Nasim Annabi
Conventional surgical techniques to seal and repair defects in highly stressed elastic tissues are insufficient. Therefore, this study aimed to engineer an inexpensive, highly adhesive, biocompatible, and biodegradable sealant based on a modified and naturally derived biopolymer, gelatin methacryloyl (GelMA). We tuned the degree of gelatin modification, prepolymer concentration, photoinitiator concentration, and crosslinking conditions to optimize the physical properties and adhesion of the photocrosslinked GelMA sealants...
June 6, 2017: Biomaterials
https://www.readbyqxmd.com/read/28578294/suppressing-mosaicism-by-au-nanowire-injector-driven-direct-delivery-of-plasmids-into-mouse-embryos
#15
Kkotchorong Park, Keun Cheon Kim, Hyoban Lee, Yoori Sung, Mijeong Kang, Yun Mi Lee, Ji Yeon Ahn, Jeong Mook Lim, Taejoon Kang, Bongsoo Kim, Eun Ju Lee
Transgenic animals have become key tools in a variety of biomedical research areas. However, microinjection commonly used for producing transgenic animals has several challenges such as physical and chemical damage to the embryos due to microinjector with buffer, and low transgene integration rates with frequent mosaicism. Here, we report direct delivery of plasmids into mouse embryos using a Au nanowire injector (NWI) that significantly improved transgene integration efficiency and suppressed mosaicism. The Au NWI could deliver plasmid into the pronucleus (PN) of a mouse zygote without buffer and rapidly release it with electric pulse...
May 27, 2017: Biomaterials
https://www.readbyqxmd.com/read/28558296/corrigendum-to-lna-aptamer-based-multi-modal-fe3o4-saturated-lactoferrin-fe3o4-blf-nanocarriers-for-triple-positive-epcam-cd133-cd44-colon-tumour-targeting-and-nir-mri-and-ct-imaging-biomaterials-71c-2015-84-99
#16
https://www.readbyqxmd.com/read/28578293/bio-inspired-crosslinking-and-matrix-drug-interactions-for-advanced-wound-dressings-with-long-term-antimicrobial-activity
#17
Chetna Dhand, Mayandi Venkatesh, Veluchami Amutha Barathi, Sriram Harini, Samiran Bairagi, Eunice Goh Tze Leng, Nandhakumar Muruganandham, Kenny Zhi Wei Low, Mobashar Hussain Urf Turabe Fazil, Xian Jun Loh, Dinesh Kumar Srinivasan, Shou Ping Liu, Roger W Beuerman, Navin Kumar Verma, Seeram Ramakrishna, Rajamani Lakshminarayanan
There is a growing demand for durable advanced wound dressings for the management of persistent infections after deep burn injuries. Herein, we demonstrated the preparation of durable antimicrobial nanofiber mats, by taking advantage of strong interfacial interactions between polyhydroxy antibiotics (with varying number of OH groups) and gelatin and their in-situ crosslinking with polydopamine (pDA) using ammonium carbonate diffusion method. Polydopamine crosslinking did not interfere with the antimicrobial efficacy of the loaded antibiotics...
May 26, 2017: Biomaterials
https://www.readbyqxmd.com/read/28558298/facile-endothelium-protection-from-tnf-%C3%AE-inflammatory-insult-with-surface-topography
#18
Georgios Stefopoulos, Costanza Giampietro, Volkmar Falk, Dimos Poulikakos, Aldo Ferrari
Adverse events triggered by the direct contact between blood and synthetic materials constitute a sincere shortcoming of cardiovascular implant technology. A well-connected autologous endothelium, generated through the process of endothelialization, impedes such interaction and endows the implant luminal interface with optimal protection. The endothelialization of artificial substrates is the result of a complex interplay between endothelial cells (ECs), surface topography, and flow-generated wall shear stress (WSS)...
May 26, 2017: Biomaterials
https://www.readbyqxmd.com/read/28554007/combined-influence-of-biophysical-and-biochemical-cues-on-maintenance-and-proliferation-of-hematopoietic-stem-cells
#19
David Gvaramia, Eike Müller, Katrin Müller, Passant Atallah, Mikhail Tsurkan, Uwe Freudenberg, Martin Bornhäuser, Carsten Werner
Homeostasis of hematopoietic stem and progenitor cells (HSPC) is controlled by a combination of biochemical and biophysical environmental cues in the bone marrow (BM) niche, where a tight balance of quiescence and proliferation of HSPC is maintained. Specifically, alongside soluble factors and extracellular matrix (ECM) proteins, spatial confinement and ECM stiffness have been recognized to be critical for regulation of HSPC fate. Here we employ a modular, glycosaminoglycan (GAG)-based biohybrid hydrogel system to balance proliferation of human HSPC and maintenance of quiescent hematopoietic stem cells (HSC) through simultaneous regulation of exogenous biochemical and biophysical cues...
May 24, 2017: Biomaterials
https://www.readbyqxmd.com/read/28558297/mri-sensitive-contrast-agent-with-anticoagulant-activity-for-surface-camouflage-of-transplanted-pancreatic-islets
#20
Yong Hwa Hwang, Min Jun Kim, Dong Yun Lee
Pancreatic islet implantation in the liver is a promising approach for diabetes therapy. However, 70% of the islet mass fails to be engrafted in the liver due to the instant blood-mediated inflammatory reactions (IBMIR) resulting from direct contact between islet cells and the bloodstream. To overcome this issue, direct monitoring is very important for establishing prognosis after islet cell therapy. Here we established a new type of MR contrast agent with anticoagulant activity via heparin-immobilized superparamagnetic iron oxide (HSPIO)...
May 23, 2017: Biomaterials
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