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Advanced Healthcare Materials

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https://www.readbyqxmd.com/read/27906521/modeling-the-human-scarred-heart-in-vitro-toward-new-tissue-engineered-models
#1
Janine C Deddens, Amir Hossein Sadeghi, Jesper Hjortnaes, Linda W van Laake, Marc Buijsrogge, Pieter A Doevendans, Ali Khademhosseini, Joost P G Sluijter
Cardiac remodeling is critical for effective tissue healing, however, excessive production and deposition of extracellular matrix components contribute to scarring and failing of the heart. Despite the fact that novel therapies have emerged, there are still no lifelong solutions for this problem. An urgent need exists to improve the understanding of adverse cardiac remodeling in order to develop new therapeutic interventions that will prevent, reverse, or regenerate the fibrotic changes in the failing heart...
December 1, 2016: Advanced Healthcare Materials
https://www.readbyqxmd.com/read/27901317/dendrimer-stabilized-gold-nanostars-as-a-multifunctional-theranostic-nanoplatform-for-ct-imaging-photothermal-therapy-and-gene-silencing-of-tumors
#2
Ping Wei, Jingwen Chen, Yong Hu, Xin Li, Han Wang, Mingwu Shen, Xiangyang Shi
Development of versatile nanomaterials combining diagnostic and therapeutic functionalities within one single nanoplatform is extremely important for tumor theranostics. In this work, the authors report the synthesis of a gold nanostar (Au NS)-based theranostic platform stabilized with cyclic arginine-glycine-aspartic (Arg-Gly-Asp, RGD) peptide-modified amine-terminated generation 3 poly(amidoamine) dendrimers. The formed RGD-modified dendrimer-stabilized Au NSs (RGD-Au DSNSs) are used as a gene delivery vector to complex small interfering RNA (siRNA) for computed tomography (CT) imaging, thermal imaging, photothermal therapy (PTT), and gene therapy of tumors...
November 30, 2016: Advanced Healthcare Materials
https://www.readbyqxmd.com/read/27901316/small-subcompartmentalized-microreactors-as-support-for-hepatocytes
#3
Yan Zhang, Marie Baekgaard-Laursen, Brigitte Städler
Mimicking specific structural or functional aspects of cells is considered a promising approach to substitute for missing or lost cellular functions. However, the interaction of such artificial assemblies with their biological counterparts including the exploitation of the activity of the synthetic partner remains thus-far a rather unexplored avenue. Herein, the assembly of active microreactors with similar size to hepatocytes is reported. These microreactors are successfully cocultured with hepatocytes into bionic tissue for up to 10 d...
November 30, 2016: Advanced Healthcare Materials
https://www.readbyqxmd.com/read/27900856/nanocomposite-hydrogels-and-their-applications-in-tissue-engineering
#4
Andisheh Motealleh, Nermin Seda Kehr
Nanocomposite (NC) hydrogels, organic-inorganic hybrid materials, are of great interest as artificial three-dimensional (3D) biomaterials for biomedical applications. NC hydrogels are prepared in water by chemically or physically cross-linking organic polymers with nanomaterials (NMs). The incorporation of hard inorganic NMs into the soft organic polymer matrix enhances the physical, chemical, and biological properties of NC hydrogels. Therefore, NC hydrogels are excellent candidates for artificial 3D biomaterials, particularly in tissue engineering applications, where they can mimic the chemical, mechanical, electrical, and biological properties of native tissues...
November 30, 2016: Advanced Healthcare Materials
https://www.readbyqxmd.com/read/27900853/an-injectable-click-cross-linked-small-intestinal-submucosa-drug-depot-for-the-treatment-of-rheumatoid-arthritis
#5
Kyungsook Kim, Ji Hoon Park, Seung Hun Park, Hye Yun Lee, Jae Ho Kim, Moon Suk Kim
Here, a click-cross-linked small intestine submucosa (SIS) drug depot is described for the treatment of rheumatoid arthritis (RA). To the best of the knowledge, there have been no studies related to the intra-articular injection of methotrexate (Met)-loaded click-cross-linkable SIS (Met-loaded Cx-SIS) for RA treatment. As the key objective of this work, injectable formulations of tetrazine-modified SIS (TE-SIS) and transcyclooctene-modified SIS (TC-SIS) are employed as drug depots. Within a few seconds, the simple mixing of equal amounts of TE-SIS and TC-SIS suspensions forms a gelatinous click-cross-linked SIS (Cx-SIS) drug depot in vitro and in vivo...
November 30, 2016: Advanced Healthcare Materials
https://www.readbyqxmd.com/read/27896935/sandcastle-worm-inspired-blood-resistant-bone-graft-binder-using-a-sticky-mussel-protein-for-augmented-in-vivo-bone-regeneration
#6
Hyo Jeong Kim, Bong-Hyuk Choi, Sang Ho Jun, Hyung Joon Cha
Xenogenic bone substitutes are commonly used during orthopedic reconstructive procedures to assist bone regeneration. However, huge amounts of blood accompanied with massive bone loss usually increase the difficulty of placing the xenograft into the bony defect. Additionally, the lack of an organic matrix leads to a decrease in the mechanical strength of the bone-grafted site. For effective bone grafting, this study aims at developing a mussel adhesion-employed bone graft binder with great blood-resistance and enhanced mechanical properties...
November 29, 2016: Advanced Healthcare Materials
https://www.readbyqxmd.com/read/27893196/guiding-hmsc-adhesion-and-differentiation-on-supported-lipid-bilayers
#7
Gülistan Koçer, Pascal Jonkheijm
Mesenchymal stem cells (MSCs) are intensively investigated for regenerative medicine applications due to their ease of isolation and multilineage differentiation capacity. Hence, designing instructive microenvironments to guide MSC behavior is important for the generation of smart interfaces to enhance biomaterial performance in guiding desired tissue formation. Supported lipid bilayers (SLBs) as cell membrane mimetics can be employed as biological interfaces with easily tunable characteristics such as biospecificity, mobility, and density of predesigned ligand molecules...
November 28, 2016: Advanced Healthcare Materials
https://www.readbyqxmd.com/read/27886461/biomaterial-based-implantable-devices-for-cancer-therapy
#8
Sue Anne Chew, Serena Danti
This review article focuses on the current local therapies mediated by implanted macroscaled biomaterials available or proposed for fighting cancer and also highlights the upcoming research in this field. Several authoritative review articles have collected and discussed the state-of-the-art as well as the advancements in using biomaterial-based micro- and nano-particle systems for drug delivery in cancer therapy. On the other hand, implantable biomaterial devices are emerging as highly versatile therapeutic platforms, which deserve an increased attention by the healthcare scientific community, as they are able to offer innovative, more effective and creative strategies against tumors...
November 25, 2016: Advanced Healthcare Materials
https://www.readbyqxmd.com/read/27885834/presence-of-an-immune-system-increases-anti-tumor-effect-of-ag-nanoparticle-treated-mice
#9
Bella B Manshian, Julio Jimenez, Uwe Himmelreich, Stefaan J Soenen
To date, most nanomedical studies rely on the use of immune-deficient mice in which the contribution of the immune system on the applied therapy is ignored. Here, the degradation of silver nanoparticles (Ag NPs) is exploited as a means to treat subcutaneous tumor models in mice. To investigate the impact of the immune system, the same tumor cell type (KLN 205 murine squamous cell carcinoma) is used in a xenograft model in NOD SCIDγ immune-deficient mice and as a syngeneic model in immune-competent DBA/2 mice...
November 25, 2016: Advanced Healthcare Materials
https://www.readbyqxmd.com/read/27885831/a-bioinspired-ultraporous-nanofiber-hydrogel-mimic-of-the-cartilage-extracellular-matrix
#10
Florian A Formica, Ece Öztürk, Samuel C Hess, Wendelin J Stark, Katharina Maniura-Weber, Markus Rottmar, Marcy Zenobi-Wong
A true biomimetic of the cartilage extracellular matrix (ECM) could greatly contribute to our ability to regenerate this tissue in a mechanically demanding, often inflamed environment. Articular cartilage is a composite tissue made of cells and fibrillar proteins embedded in a hydrophilic polymeric meshwork. Here, a polyanionic functionalized alginate is used to mimic the glycosaminoglycan component of the native ECM. To create the fibrillar component, cryoelectrospinning of poly(ε-caprolactone) on a -78 °C mandrel, subsequently treated by O2 plasma, is used to create a stable, ultraporous and hydrophillic nanofiber network...
November 25, 2016: Advanced Healthcare Materials
https://www.readbyqxmd.com/read/27885829/autoclave-sterilization-of-pedot-pss-electrophysiology-devices
#11
Ilke Uguz, Mehran Ganji, Adel Hama, Atsunori Tanaka, Sahika Inal, Ahmed Youssef, Roisin M Owens, Pascale P Quilichini, Antoine Ghestem, Christophe Bernard, Shadi A Dayeh, George G Malliaras
Autoclaving, the most widely available sterilization method, is applied to poly(3,4-ethylenedioxythiophene) doped with polystyrene sulfonate (PEDOT:PSS) electrophysiology devices. The process does not harm morphology or electrical properties, while it effectively kills E. coli intentionally cultured on the devices. This finding paves the way to widespread introduction of PEDOT:PSS electrophysiology devices to the clinic.
November 25, 2016: Advanced Healthcare Materials
https://www.readbyqxmd.com/read/27879061/patterned-slips-for-the-formation-of-arrays-of-biofilm-microclusters-with-defined-geometries
#12
Julia Bruchmann, Ivana Pini, Tejeshwar S Gill, Thomas Schwartz, Pavel A Levkin
Biofilms represent an immense problem in medicine due to their strong drug-resistant properties and inherent stress-response activities. Due to the inhomogeneous and very complex architectures of large biofilm aggregates, biofilm studies often suffer from low reproducibility. In this study, an approach to form arrays of homogeneous biofilm microclusters with defined 2D geometries is presented. The method is based on the formation of water-infused hydrophilic porous polymer areas with precise geometries separated by "slippery" lubricant-infused porous surface (SLIPS)...
November 23, 2016: Advanced Healthcare Materials
https://www.readbyqxmd.com/read/27869355/delivery-of-flightless-i-neutralizing-antibody-from-porous-silicon-nanoparticles-improves-wound-healing-in-diabetic-mice
#13
Christopher T Turner, Steven J P McInnes, Elizabeth Melville, Allison J Cowin, Nicolas H Voelcker
Flightless I (Flii) is elevated in human chronic wounds and is a negative regulator of wound repair. Decreasing its activity improves healing responses. Flii neutralizing antibodies (FnAbs) decrease Flii activity in vivo and hold significant promise as healing agents. However, to avoid the need for repeated application in a clinical setting and to protect the therapeutic antibody from the hostile environment of the wound, suitable delivery vehicles are required. In this study, the use of porous silicon nanoparticles (pSi NPs) is demonstrated for the controlled release of FnAb to diabetic wounds...
November 21, 2016: Advanced Healthcare Materials
https://www.readbyqxmd.com/read/27863177/using-a-redox-modality-to-connect-synthetic-biology-to-electronics-hydrogel-based-chemo-electro-signal-transduction-for-molecular-communication
#14
Yi Liu, Chen-Yu Tsao, Eunkyoung Kim, Tanya Tschirhart, Jessica L Terrell, William E Bentley, Gregory F Payne
A hydrogel-based dual film coating is electrofabricated for transducing bio-relevant chemical information into electronical output. The outer film has a synthetic biology construct that recognizes an external molecular signal and transduces this input into the expression of an enzyme that converts redox-inactive substrate into a redox-active intermediate, which is detected through an amplification mechanism of the inner redox-capacitor film.
November 18, 2016: Advanced Healthcare Materials
https://www.readbyqxmd.com/read/27860468/porphyrin-based-carbon-dots-for-photodynamic-therapy-of-hepatoma
#15
Yang Li, Xiaohua Zheng, Xiaoyu Zhang, Shi Liu, Qing Pei, Min Zheng, Zhigang Xie
Porphyrin-containing carbon dots (CDs) possess ultrasmall size, excellent water solubility, and photostability. These CDs can effectively generate cytotoxic singlet oxygen upon irradiation, and induce the cell apoptosis. Photodynamic ability of CDs inhibits the growth of hepatoma. This work not only sheds light on developing functional carbon dots, but also highlights the importance of special-structure precursor molecules in synthesizing functional CDs.
November 18, 2016: Advanced Healthcare Materials
https://www.readbyqxmd.com/read/27860430/mesenchymal-stem-cell-magnetization-magnetic-multilayer-microcapsule-uptake-toxicity-impact-on-functional-properties-and-perspectives-for-magnetic-delivery
#16
Kirill V Lepik, Albert R Muslimov, Alexander S Timin, Vladislav S Sergeev, Dmitry S Romanyuk, Ivan S Moiseev, Elena V Popova, Igor L Radchenko, Alexander D Vilesov, Oleg V Galibin, Gleb B Sukhorukov, Boris V Afanasyev
Mesenchymal stem cells (MSCs) are widely used in cell therapy due to their convenience, multiline differentiation potential, reproducible protocols, and biological properties. The potential of MSCs to impregnate magnetic microcapsules and their possible influence on cell function and ability to response to magnetic field have been explored. Interestingly, the cells suspended in media show much higher ability in internalization of microcapsules, then MSCs adhere into the surface. There is no significant effect of microcapsules on cell toxicity compared with other cell line-capsule internalization reported in literature...
November 18, 2016: Advanced Healthcare Materials
https://www.readbyqxmd.com/read/27860428/assessing-the-intracellular-integrity-of-phosphine-stabilized-ultrasmall-cytotoxic-gold-nanoparticles-enabled-by-fluorescence-labeling
#17
Janine Broda, Andrea Küster, Stefan Westhues, Dirk Fahrenkamp, Andreas T J Vogg, Julia Steitz, Felix M Mottaghy, Gerhard Müller-Newen, Ulrich Simon
As the size of nanoparticles (NPs) is in the range of biological molecules and subcellular structures, they provide new perspectives in biomedicine. This work presents studies concerning the cellular uptake and distribution of phosphine-stabilized cytotoxic 1.4 nm sized AuNPs and their probable degradation during this process. Therefore, ultrasmall phosphine-stabilized AuNPs are modified by linking a fluorophore covalently to the ligand shell. Monitoring the fluorescence on a cellular level by means of flow cytometry and confocal laser scanning microscopy allows determining the fate of the ligand shell during AuNP cell internalization, due to the fact that the fluorescence of a fluorophore bound near to the AuNP surface is quenched...
November 18, 2016: Advanced Healthcare Materials
https://www.readbyqxmd.com/read/27860415/coordination-induced-assembly-of-intelligent-polysaccharide-based-phototherapeutic-nanoparticles-for-cancer-treatment
#18
Ye Tian, Ranran Guo, Yajun Wang, Wuli Yang
Smart polysaccharide-based anticancer phototherapeutic nanoparticles are prepared via a coordination-induced assembly process. Upon irradiated with a near infrared laser, the nanoparticles are not only able to simultaneously generate reactive oxygen species and hyperthermia that ablate tumors, but also possess tumor microenvironment-responsive off/on near infrared fluorescence and enhancement in photothermal effect, making them promising theranostic platform of cancer.
November 18, 2016: Advanced Healthcare Materials
https://www.readbyqxmd.com/read/27860372/biomaterials-and-culture-technologies-for-regenerative-therapy-of-liver-tissue
#19
Roman A Perez, Cho-Rok Jung, Hae-Won Kim
Regenerative approach has emerged to substitute the current extracorporeal technologies for the treatment of diseased and damaged liver tissue. This is based on the use of biomaterials that modulate the responses of hepatic cells through the unique matrix properties tuned to recapitulate regenerative functions. Cells in liver preserve their phenotype or differentiate through the interactions with extracellular matrix molecules. Therefore, the intrinsic properties of the engineered biomaterials, such as stiffness and surface topography, need to be tailored to induce appropriate cellular functions...
November 18, 2016: Advanced Healthcare Materials
https://www.readbyqxmd.com/read/27860435/porous-pt-nanoparticles-with-high-near-infrared-photothermal-conversion-efficiencies-for-photothermal-therapy
#20
Xiao-Ming Zhu, Hong-Ye Wan, Henglei Jia, Liang Liu, Jianfang Wang
Plasmonic nanostructures are of potential in acting as a type of optical agents for cancer photothermal therapy. To effectively function as photothermal therapy agents, plasmonic nanostructures are strongly desired to have good biocompatibility and high photothermal conversion efficiencies. In this study, poly(diallyldimethylammonium chloride)-coated porous Pt nanoparticles are synthesized for photothermal therapy. The Pt nanoparticles possess broadband near-infrared light absorption in the range from 650 to 1200 nm, therefore allowing for selecting different laser wavelengths for photothermal therapy...
November 17, 2016: Advanced Healthcare Materials
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