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Advanced Healthcare Materials

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https://www.readbyqxmd.com/read/28338291/versatile-polymer-nanoparticles-as-two-photon-triggered-photosensitizers-for-simultaneous-cellular-deep-tissue-imaging-and-photodynamic-therapy
#1
Liang Guo, Jiechao Ge, Qian Liu, Qingyan Jia, Hongyan Zhang, Weimin Liu, Guangle Niu, Sha Liu, Jianru Gong, Steffen Hackbarth, Pengfei Wang
Clinical applications of current photodynamic therapy (PDT) photosensitizers (PSs) are often limited by their absorption in the UV-vis range that possesses limited tissue penetration ability, leading to ineffective therapeutic response for deep-seated tumors. Alternatively, two-photon excited PS (TPE-PS) using NIR light triggered is one the most promising candidates for PDT improvement. Herein, multimodal polymer nanoparticles (PNPs) from polythiophene derivative as two-photon fluorescence imaging as well as two-photon-excited PDT agent are developed...
March 24, 2017: Advanced Healthcare Materials
https://www.readbyqxmd.com/read/28338285/remote-control-of-cellular-functions-the-role-of-smart-nanomaterials-in-the-medicine-of-the-future
#2
REVIEW
Giada Graziana Genchi, Attilio Marino, Agostina Grillone, Ilaria Pezzini, Gianni Ciofani
The remote control of cellular functions through smart nanomaterials represents a biomanipulation approach with unprecedented potential applications in many fields of medicine, ranging from cancer therapy to tissue engineering. By actively responding to external stimuli, smart nanomaterials act as real nanotransducers able to mediate and/or convert different forms of energy into both physical and chemical cues, fostering specific cell behaviors. This report describes those classes of nanomaterials that have mostly paved the way to a "wireless" control of biological phenomena, focusing the discussion on some examples close to the clinical practice...
March 24, 2017: Advanced Healthcare Materials
https://www.readbyqxmd.com/read/28337858/transdermal-protein-delivery-using-choline-and-geranate-cage-deep-eutectic-solvent
#3
Amrita Banerjee, Kelly Ibsen, Yasunori Iwao, Michael Zakrewsky, Samir Mitragotri
Transdermal delivery of peptides and other biological macromolecules is limited due to skin's inherent low permeability. Here, the authors report the use of a deep eutectic solvent, choline and geranate (CAGE), to enhance topical delivery of proteins such as bovine serum albumin (BSA, molecular weight: ≈66 kDa), ovalbumin (OVA, molecular weight: ≈45 kDa) and insulin (INS, molecular weight: 5.8 kDa). CAGE enhances permeation of BSA, OVA, and insulin into porcine skin ex vivo, penetrating deep into the epidermis and dermis...
March 24, 2017: Advanced Healthcare Materials
https://www.readbyqxmd.com/read/28337855/simple-protein-modification-using-zwitterionic-polymer-to-mitigate-the-bioactivity-loss-of-conjugated-insulin
#4
Jinbing Xie, Yang Lu, Wei Wang, Hui Zhu, Zhigang Wang, Zhiqiang Cao
Polymer-protein conjugation has been extensively explored toward a better protein drug with improved pharmacokinetics. However, a major problem with polymer-protein conjugation is that the polymers drastically reduce the bioactivity of the modified protein. There is no perfect solution to prevent the bioactivity loss, no matter the polymer is conjugated in a non-site specific way, or a more complex site-specific procedure. Here the authors report for the first time that when zwitterionic carboxybetaine polymer (PCB) is conjugated to insulin through simple conventional coupling chemistry...
March 24, 2017: Advanced Healthcare Materials
https://www.readbyqxmd.com/read/28337854/silk-fibroin-biomaterial-shows-safe-and-effective-wound-healing-in-animal-models-and-a-randomized-controlled-clinical-trial
#5
Wei Zhang, Longkun Chen, Jialin Chen, Lingshuang Wang, Xuexian Gui, Jisheng Ran, Guowei Xu, Hongshi Zhao, Mengfeng Zeng, Junfeng Ji, Li Qian, Jianda Zhou, Hongwei Ouyang, Xiaohui Zou
Due to its excellent biological and mechanical properties, silk fibroin has been intensively explored for tissue engineering and regenerative medicine applications. However, lack of translational evidence has hampered its clinical application for tissue repair. Here a silk fibroin film is developed and its translational potential is investigated for skin repair by performing comprehensive preclinical and clinical studies to fully evaluate its safety and effectiveness. The silk fibroin film fabricated using all green chemistry approaches demonstrates remarkable characteristics, including transmittance, fluid handling capacity, moisture vapor permeability, waterproofness, bacterial barrier properties, and biocompatibility...
March 24, 2017: Advanced Healthcare Materials
https://www.readbyqxmd.com/read/28337850/high-throughput-screening-of-vascular-endothelium-destructive-or-protective-microenvironments-cooperative-actions-of-extracellular-matrix-composition-stiffness-and-structure
#6
Yonghui Ding, Michael Floren, Wei Tan
Pathological modification of the subendothelial extracellular matrix (ECM) has closely been associated with endothelial activation and subsequent cardiovascular disease progression. To understand regulatory mechanisms of these matrix modifications, the majority of previous efforts have focused on the modulation of either chemical composition or matrix stiffness on 2D smooth surfaces without simultaneously probing their cooperative effects on endothelium function on in vivo like 3D fibrous matrices. To this end, a high-throughput, combinatorial microarray platform on 2D and 3D hydrogel settings to resemble the compositions, stiffness, and structure of healthy and diseased subendothelial ECM has been established, and further their respective and combined effects on endothelial attachment, proliferation, inflammation, and junctional integrity have been investigated...
March 24, 2017: Advanced Healthcare Materials
https://www.readbyqxmd.com/read/28322517/materials-for-microfluidic-immunoassays-a-review
#7
REVIEW
Lei Mou, Xingyu Jiang
Conventional immunoassays suffer from at least one of these following limitations: long processing time, high costs, poor user-friendliness, technical complexity, poor sensitivity and specificity. Microfluidics, a technology characterized by the engineered manipulation of fluids in channels with characteristic lengthscale of tens of micrometers, has shown considerable promise for improving immunoassays that could overcome these limitations in medical diagnostics and biology research. The combination of microfluidics and immunoassay can detect biomarkers with faster assay time, reduced volumes of reagents, lower power requirements, and higher levels of integration and automation compared to traditional approaches...
March 21, 2017: Advanced Healthcare Materials
https://www.readbyqxmd.com/read/28322514/strategies-to-improve-cancer-photothermal-therapy-mediated-by-nanomaterials
#8
REVIEW
Duarte de Melo-Diogo, Cleide Pais-Silva, Diana R Dias, André F Moreira, Ilídio J Correia
The deployment of hyperthermia-based treatments for cancer therapy has captured the attention of different researchers worldwide. In particular, the application of light-responsive nanomaterials to mediate hyperthermia has revealed promising results in several pre-clinical assays. Unlike conventional therapies, these nanostructures can display a preferential tumor accumulation and thus mediate, upon irradiation with near-infrared light, a selective hyperthermic effect with temporal resolution. Different types of nanomaterials such as those based on gold, carbon, copper, molybdenum, tungsten, iron, palladium and conjugated polymers have been used for this photothermal modality...
March 21, 2017: Advanced Healthcare Materials
https://www.readbyqxmd.com/read/28322024/au-nanoclusters-and-photosensitizer-dual-loaded-spatiotemporal-controllable-liposomal-nanocomposites-enhance-tumor-photodynamic-therapy-effect-by-inhibiting-thioredoxin-reductase
#9
Fuping Gao, Weiping Zheng, Liang Gao, Pengju Cai, Ru Liu, Yaling Wang, Qing Yuan, Yuliang Zhao, Xueyun Gao
Photodynamic therapy (PDT) is a minimally invasive therapeutic procedure of tumors with high selectivity and low side effect. However, it is usually not efficient in long-lasting tumor control. One of the main reasons is tumor cells develop some protective mechanisms that help them to deal with oxidative stress in the environment. The thioredoxin system in cancer is an important antioxidant defense system. Au nanoclusters could effectively inhibit thioredoxin reductase (TrxR) in tumor cell cytoplasm. Herein, Au nanoclusters and photosensitizer Chlorine 6 (Ce6) are co-loaded in spatiotemporal controllable liposomal nanocomposites...
March 21, 2017: Advanced Healthcare Materials
https://www.readbyqxmd.com/read/28322015/compartmentalized-spherical-collagen-microparticles-for-anisotropic-cell-culture-microenvironments
#10
Satoru Yoshida, Masahiro Takinoue, Hiroaki Onoe
This paper describes a new fabrication method for obtaining anisotropic spherical hydrogel microparticles with different types of extracellular matrix (ECM) hemispheres for use in 3D cell culture. To fabricate the microparticles, a mixture of an ECM precursor solution and sodium alginate is ejected into a calcium chloride solution under large centrifugal acceleration by a centrifuge-based microfluidic device; the calcium alginate hydrogel plays a significant role as a "sacrificial gelation template" to maintain the ECM molecules in each hemisphere...
March 21, 2017: Advanced Healthcare Materials
https://www.readbyqxmd.com/read/28322012/3d-printed-multidrug-eluting-stent-from-graphene-nanoplatelet-doped-biodegradable-polymer-composite
#11
Santosh K Misra, Fatemeh Ostadhossein, Ramya Babu, Joseph Kus, Divya Tankasala, Andre Sutrisno, Kathleen A Walsh, Corinne R Bromfield, Dipanjan Pan
Patients with percutaneous coronary intervention generally receive either bare metal stents or drug-eluting stents to restore the normal blood flow. However, due to the lack of stent production with an individual patient in mind, the same level of effectiveness may not be possible in treating two different clinical scenarios. This study introduces for the first time the feasibility of a patient-specific stenting process constructed from direct 3D segmentation of medical images using direct 3D printing of biodegradable polymer-graphene composite with dual drug incorporation...
March 21, 2017: Advanced Healthcare Materials
https://www.readbyqxmd.com/read/28321991/atomic-layer-deposition-of-a-silver-nanolayer-on-advanced-titanium-orthopedic-implants-inhibits-bacterial-colonization-and-supports-vascularized-de-novo-bone-ingrowth
#12
Aine Devlin-Mullin, Naomi M Todd, Zahra Golrokhi, Hua Geng, Moritz A Konerding, Nigel G Ternan, John A Hunt, Richard J Potter, Chris Sutcliffe, Eric Jones, Peter D Lee, Christopher A Mitchell
Joint replacement surgery is associated with significant morbidity and mortality following infection with either methicillin-resistant Staphylococcus aureus (MRSA) or Staphylococcus epidermidis. These organisms have strong biofilm-forming capability in deep wounds and on prosthetic surfaces, with 10(3) -10(4) microbes resulting in clinically significant infections. To inhibit biofilm formation, we developed 3D titanium structures using selective laser melting and then coated them with a silver nanolayer using atomic layer deposition...
March 21, 2017: Advanced Healthcare Materials
https://www.readbyqxmd.com/read/28319334/biofunctionalized-plants-as-diverse-biomaterials-for-human-cell-culture
#13
Gianluca Fontana, Joshua Gershlak, Michal Adamski, Jae-Sung Lee, Shion Matsumoto, Hau D Le, Bernard Binder, John Wirth, Glenn Gaudette, William L Murphy
The commercial success of tissue engineering products requires efficacy, cost effectiveness, and the possibility of scaleup. Advances in tissue engineering require increased sophistication in the design of biomaterials, often challenging the current manufacturing techniques. Interestingly, several of the properties that are desirable for biomaterial design are embodied in the structure and function of plants. This study demonstrates that decellularized plant tissues can be used as adaptable scaffolds for culture of human cells...
March 20, 2017: Advanced Healthcare Materials
https://www.readbyqxmd.com/read/28306221/construction-of-small-diameter-vascular-graft-by-shape-memory-and-self-rolling-bacterial-cellulose-membrane
#14
Ying Li, Kai Jiang, Jian Feng, Jinzhe Liu, Rong Huang, Zhaojun Chen, Junchuan Yang, Zhaohe Dai, Yong Chen, Nuoxin Wang, Wenjin Zhang, Wenfu Zheng, Guang Yang, Xingyu Jiang
Bacterial cellulose (BC) membranes with shape-memory properties allow the rapid preparation of artificial small-diameter blood vessels when combined with microfluidics-based patterning with multiple types of cells. Lyophilization of a wet multilayered rolled BC tube endows it with memory to recover its tubular shape after unrolling. The unrolling of the BC tube yields a flat membrane, and subsequent patterning with endothelial cells, smooth muscle cells, and fibroblast cells is carried out by microfluidics...
March 17, 2017: Advanced Healthcare Materials
https://www.readbyqxmd.com/read/28306220/multicellular-biohybrid-materials-probing-the-interplay-of-cells-of-different-types-precisely-positioned-and-constrained-on-3d-wireframe-like-microstructures
#15
Maurizio R Gullo, Shoji Takeuchi, Oliver Paul
Driven by the unbroken miniaturization trend in microtechnology, the development of smaller, yet reliable and efficient, highly integrated microsystems can benefit from inherent capabilities of biological cells. In particular, by featuring multiple types of cells, biohybrid systems exhibiting self-contained sensing and actuation capabilities can be conceived. To ensure the proper functioning of such multicellular biohybrid systems, the intended cell arrangement needs to be maintained over time. Microscaffolds designed for this purpose should therefore selectively guide or hinder cell migration...
March 17, 2017: Advanced Healthcare Materials
https://www.readbyqxmd.com/read/28272784/stable-titania-nanostructures-on-stainless-steel-coronary-stent-surface-for-enhanced-corrosion-resistance-and-endothelialization
#16
Chandini C Mohan, Aleena Mary Cherian, Sujish Kurup, John Joseph, Manitha B Nair, Maniyal Vijayakumar, Shantikumar V Nair, Deepthy Menon
Stainless steel (SS) coronary stents continue to present risk of in-stent restenosis that impact its long term safety and efficacy. The present work focuses on developing a drug-free and polymer-less surface on coronary stents by utilizing a titania (TiO2 ) nanotexturing approach through hydrothermal processing, that will offer improved stent performance in vivo. Mechanically stable and durable nanotextured coatings are obtained on SS stents that also offer good corrosion resistance. In vitro vascular cell (endothelial and smooth muscle cells) studies on surface modified SS show preferential rapid endothelialization with enhanced nitric oxide production and reduce smooth muscle cell proliferation, in comparison to unmodified SS...
March 8, 2017: Advanced Healthcare Materials
https://www.readbyqxmd.com/read/28272780/microfluidic-encapsulation-of-prickly-zinc-doped-copper-oxide-nanoparticles-with-vd1142-modified-spermine-acetalated-dextran-for-efficient-cancer-therapy
#17
Hongbo Zhang, Dongfei Liu, Liang Wang, Zehua Liu, Runrun Wu, Agne Janoniene, Ming Ma, Guoqing Pan, Lina Baranauskiene, Linlin Zhang, Wenguo Cui, Vilma Petrikaite, Daumantas Matulis, Hongxia Zhao, Jianming Pan, Hélder A Santos
Structural features of nanoparticles have recently been explored for different types of applications. To explore specific particles as nanomedicine and physically destroy cancer is interesting, which might avoid many obstacles in cancer treatment, for example, drug resistance. However, one key element and technical challenge of those systems is to selectively target them to cancer cells. As a proof-of-concept, Prickly zinc-doped copper oxide (Zn-CuO) nanoparticles (Prickly NPs) have been synthesized, and subsequently encapsulated in a pH-responsive polymer; and the surface has been modified with a novel synthesized ligand, 3-(cyclooctylamino)-2,5,6-trifluoro-4-[(2-hydroxyethyl)sulfonyl] benzenesulfonamide (VD1142)...
March 8, 2017: Advanced Healthcare Materials
https://www.readbyqxmd.com/read/28267277/generating-multicompartmental-3d-biological-constructs-interfaced-through-sequential-injections-in-microfluidic-devices
#18
Giovanni Stefano Ugolini, Roberta Visone, Alberto Redaelli, Matteo Moretti, Marco Rasponi
A novel technique is presented for molding and culturing composite 3D cellular constructs within microfluidic channels. The method is based on the use of removable molding polydimethylsiloxane (PDMS) inserts, which allow to selectively and incrementally generate composite 3D constructs featuring different cell types and/or biomaterials, with a high spatial control. The authors generate constructs made of either stacked hydrogels, with uniform horizontal interfaces, or flanked hydrogels with vertical interfaces...
March 7, 2017: Advanced Healthcare Materials
https://www.readbyqxmd.com/read/28257557/m-2-doping-induced-simultaneous-phase-size-control-and-remarkable-enhanced-upconversion-luminescence-of-nalnf4-probes-for-optical-guided-tiny-tumor-diagnosis
#19
Youbin Li, Xiaolong Li, Zhenluan Xue, Mingyang Jiang, Songjun Zeng, Jianhua Hao
Doping has played a vital role in constructing desirable hybrid materials with tunable functions and properties via incorporating atoms into host matrix. Herein, a simple strategy for simultaneously modifying the phase, size, and upconversion luminescence (UCL) properties of the NaLnF4 (Ln = Y, Yb) nanocrystals by high-temperature coprecipitation through nonequivalent M(2+) doping (M = Mg(2+) , Co(2+) ) has been demonstrated. The phase transformation from cubic to hexagonal is readily achieved by doping M(2+) ...
March 3, 2017: Advanced Healthcare Materials
https://www.readbyqxmd.com/read/28247563/combinatorial-therapies-after-spinal-cord-injury-how-can-biomaterials-help
#20
REVIEW
Tobias Führmann, Priya N Anandakumaran, Molly S Shoichet
Traumatic spinal cord injury (SCI) results in an immediate loss of motor and sensory function below the injury site and is associated with a poor prognosis. The inhibitory environment that develops in response to the injury is mainly due to local expression of inhibitory factors, scarring and the formation of cystic cavitations, all of which limit the regenerative capacity of endogenous or transplanted cells. Strategies that demonstrate promising results induce a change in the microenvironment at- and around the lesion site to promote endogenous cell repair, including axonal regeneration or the integration of transplanted cells...
March 1, 2017: Advanced Healthcare Materials
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