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Journal of Materials Chemistry. B, Materials for Biology and Medicine

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https://www.readbyqxmd.com/read/27746916/co-operative-transitions-of-responsive-polymer-coated-gold-nanoparticles-precision-tuning-and-direct-evidence-for-co-operative-aggregation
#1
Sangho Won, Daniel J Phillips, Marc Walker, Matthew I Gibson
Responsive polymers and polymer-coated nanoparticles have many potential bio-applications with the crucial parameter being the exact temperature where the transition occurs. Chemical modification of hydrophobic/hydrophilic or ligand binding sites has been widely explored as a tool for controlling this transition, but requires the synthesis of many different components to achieve precise control. This study reports an extensive investigation into the use of blending (i.e. mixing) as a powerful tool to modulate the transition temperature of poly(N-isopropylacrylamide) (PNIPAM) coated gold nanoparticles...
September 14, 2016: Journal of Materials Chemistry. B, Materials for Biology and Medicine
https://www.readbyqxmd.com/read/27746915/fortified-interpenetrating-polymers-bacteria-resistant-coatings-for-medical-devices
#2
Seshasailam Venkateswaran, Orlando David Henrique Dos Santos, Emma Scholefield, Annamaria Lilienkampf, Peter J Gwynne, David G Swann, Kevin Dhaliwal, Maurice P Gallagher, Mark Bradley
Infections arising from contaminated medical devices are a serious global issue, contributing to antibiotic resistance and imposing significant strain on healthcare systems. Since the majority of medical device-associated infections are biofilm related, efforts are being made to generate either bacteria-repellent or antibacterial coatings aimed at preventing bacterial colonisation. Here, we utilise a nanocapsule mediated slow release of a natural antimicrobial to improve the performance of a bacteria repellent polymer coating...
August 28, 2016: Journal of Materials Chemistry. B, Materials for Biology and Medicine
https://www.readbyqxmd.com/read/27429756/three-dimensional-multipod-superstructure-based-on-cu-oh-2-as-a-highly-efficient-nanozyme
#3
Ren Cai, Dan Yang, Xigao Chen, Yun Huang, Yifan Lyv, Jinglin He, Muling Shi, I-Ting Teng, Shuo Wan, Weijia Hou, Weihong Tan
A highly efficient nanozyme system, termed hollow multipod Cu(OH)2 superstructure (HMPS), has been developed via direct conversion from irregular nanoparticles. The HMPS displayed body size around 150 nm and branch lengths in the range of 150~250 nm. Based on the excellent catalytic property of HMPS, we developed a simple and highly sensitive colorimetric assay to detect urine glucose, and the results are in good agreement with hospital examination reports.
July 21, 2016: Journal of Materials Chemistry. B, Materials for Biology and Medicine
https://www.readbyqxmd.com/read/27746914/pluripotent-stem-cell-derived-hepatocytes-using-materials-to-define-cellular-differentiation-and-tissue-engineering
#4
B Lucendo-Villarin, H Rashidi, K Cameron, D C Hay
Pluripotent stem cell derived liver cells (hepatocytes) represent a promising alternative to primary tissue for biological and clinical applications. To date, most hepatocyte maintenance and differentiation systems have relied upon the use of animal derived components. This serves as a significant barrier to large scale production and application of stem cell derived hepatocytes. Recently, the use of defined biologics has overcome those limitations in two-dimensional monolayer culture. In order to improve the cell phenotype further, three-dimensional culture systems have been employed to better mimic the in vivo situation, drawing upon materials chemistry, engineering and biology...
May 28, 2016: Journal of Materials Chemistry. B, Materials for Biology and Medicine
https://www.readbyqxmd.com/read/27551426/substrate-modulus-regulates-osteogenic-differentiation-of-rat-mesenchymal-stem-cells-through-integrin-%C3%AE-1-and-bmp-receptor-type-ia
#5
R Guo, S Lu, A R Merkel, J A Sterling, S A Guelcher
Osteoblast differentiation of mesenchymal stem cells is regulated by both soluble factor (e.g., bone morphogenetic proteins (BMP)) and mechanically transduced signaling, but the mechanisms have only been partially elucidated. In this study, physical association of BMP Receptor I (BMPRI) with integrin β1 sub-unit (Iβ1) was hypothesized to mediate osteoblast differentiation of rat bone marrow-derived mesenchymal stem cells (MSCs) on bone-like substrates. The effects of substrate modulus on osteoblast differentiation of MSCs were investigated for 2D poly(ester urethane) films with moduli varying from 5 - 266 MPa, which spans the range from collagen fibrils to trabecular bone...
May 28, 2016: Journal of Materials Chemistry. B, Materials for Biology and Medicine
https://www.readbyqxmd.com/read/27525102/nanoengineered-biomimetic-hydrogels-for-guiding-human-stem-cell-osteogenesis-in-three-dimensional-microenvironments
#6
Arghya Paul, Vijayan Manoharan, Dorothee Krafft, Alexander Assmann, Jorge Alfredo Uquillas, Su Ryon Shin, Anwarul Hasan, Mohammad Asif Hussain, Adnan Memic, Akhilesh K Gaharwar, Ali Khademhosseini
The ability to modulate stem cell differentiation in a three dimensional (3D) microenvironment for bone tissue engineering in absence of exogenous pharmaceutical agents such as bone morphogenic protein (BMP-2) remains a challenge. In this study, we introduce extracellular matrix (ECM)-mimicking nanocomposite hydrogels to induce osteogenic differentiation of human mesenchymal stem cells (hMSCs) for bone regeneration in absence of any osteoinducting factors. In particular, we have reinforced photocrosslinkable collagen-based matrix (gelatin methacryloyl, GelMA) used disk-shaped nanosilicates (nSi), a new class of two-dimensional (2D) nanomaterials...
May 28, 2016: Journal of Materials Chemistry. B, Materials for Biology and Medicine
https://www.readbyqxmd.com/read/27499854/mechanical-loading-inhibits-hypertrophy-in-chondrogenically-differentiating-hmscs-within-a-biomimetic-hydrogel
#7
E A Aisenbrey, S J Bryant
Three dimensional hydrogels are a promising vehicle for delivery of adult human bone-marrow derived mesenchymal stem cells (hMSCs) for cartilage tissue engineering. One of the challenges with using this cell type is the default pathway is terminal differentiation, a hypertrophic phenotype and precursor to endochondral ossification. We hypothesized that a synthetic hydrogel consisting of extracellular matrix (ECM) analogs derived from cartilage when combined with dynamic loading provides physiochemical cues for achieving a stable chondrogenic phenotype...
May 28, 2016: Journal of Materials Chemistry. B, Materials for Biology and Medicine
https://www.readbyqxmd.com/read/27482381/bioactive-natural-protein-hydroxyapatite-nanocarriers-for-optimizing-osteogenic-differentiation-of-mesenchymal-stem-cells
#8
Z Z Ding, Z H Fan, X W Huang, S M Bai, D W Song, Q Lu, D L Kaplan
Improving the controlled release of bioactive growth factors to regulate cell behavior and tissue regeneration remains a need in tissue engineering and regenerative medicine. Inorganic and polymeric nanoparticles have been extensively fabricated as bioactive biomaterials with enhanced biocompatibility and effective carriers of therapeutic agents, however, challenges remain such as the achievement of high loading capacity and sustained release, and the bioactivity preservation of growth factors. Here, a multilayered, silk coated hydroxyapatite (HA) nanocarrier with drug loading-release capacity superior to pure silk or HA nanoparticles was developed...
May 28, 2016: Journal of Materials Chemistry. B, Materials for Biology and Medicine
https://www.readbyqxmd.com/read/27453782/oxygen-delivering-biomaterials-for-tissue-engineering
#9
Ashley L Farris, Alexandra N Rindone, Warren L Grayson
Tissue engineering (TE) has provided promising strategies for regenerating tissue defects, but few TE approaches have been translated for clinical applications. One major barrier in TE is providing adequate oxygen supply to implanted tissue scaffolds, since oxygen diffusion from surrounding vasculature in vivo is limited to the periphery of the scaffolds. Moreover, oxygen is also an important signaling molecule for controlling stem cell differentiation within TE scaffolds. Various technologies have been developed to increase oxygen delivery in vivo and enhance the effectiveness of TE strategies...
May 28, 2016: Journal of Materials Chemistry. B, Materials for Biology and Medicine
https://www.readbyqxmd.com/read/27446588/biomaterials-for-pluripotent-stem-cell-engineering-from-fate-determination-to-vascularization
#10
Nailah M Seale, Shyni Varghese
Recent advancements in material science and engineering may hold the key to overcoming reproducibility and scalability limitations currently hindering the clinical translation of stem cell therapies. Biomaterial assisted differentiation commitment of stem cells and modulation of their in vivo function could have significant impact in stem cell-centred regenerative medicine approaches and next gen technological platforms. Synthetic biomaterials are of particular interest as they provide a consistent, chemically defined, and tunable way of mimicking the physical and chemical properties of the natural tissue or cell environment...
May 28, 2016: Journal of Materials Chemistry. B, Materials for Biology and Medicine
https://www.readbyqxmd.com/read/27239311/tunable-self-assembly-of-irinotecan-fatty-acid-prodrugs-with-increased-cytotoxicity-to-cancer-cells
#11
Chunqiu Zhang, Shubin Jin, Xiangdong Xue, Tingbin Zhang, Yonggang Jiang, Paul C Wang, Xing-Jie Liang
The development of a clinical chemotherapeutic is not an easy task. One challenge is how to deliver the agent to cancer cells. Nano-formulation of prodrugs, which combines the strengths of nanotechnology and prodrugs, possesses many advantages for chemotherapeutic drug delivery, including high drug loading efficiency, improved drug availability and enhanced accumulation in cancer cells. Here, we have constructed a small library of Irinotecan-derived prodrugs, in which the 20-hydroxyl group was derived with fatty-acid moieties through esterification...
May 21, 2016: Journal of Materials Chemistry. B, Materials for Biology and Medicine
https://www.readbyqxmd.com/read/27429754/characterization-and-optimization-of-ph-responsive-polymer-nanoparticles-for-drug-delivery-to-oral-biofilms
#12
Jiayi Zhou, Benjamin Horev, Geelsu Hwang, Marlise I Klein, Hyun Koo, Danielle S W Benoit
We previously reported on cationic, pH-responsive p(DMAEMA)-b-p(DMAEMA-co-BMA-co-PAA) block copolymer micelles with high affinity for dental and biofilm surfaces and efficient anti-bacterial drug release in response to acidic pH, characteristic of cariogenic (tooth-decay causing) biofilm microenvironments. Here, we show that micelle pH-responsive behaviors can be enhanced through alterations in corona:core molecular weight ratios (CCR). Although similarly stable at physiological pH, upon exposure to acidic pH, micelles with CCR of 4...
May 14, 2016: Journal of Materials Chemistry. B, Materials for Biology and Medicine
https://www.readbyqxmd.com/read/27162639/glycosylated-gold-nanoparticle-libraries-for-label-free-multiplexed-lectin-biosensing
#13
Sarah-Jane Richards, Lucienne Otten, Matthew I Gibson
Glycan/lectin interactions drive a wide range of recognition and signal transduction processes within nature. However, their measurement is complicated or limited by the analytical tools available. Most technologies require fluorescently labelled proteins (e.g. microarrays) or expensive infrastructure (such as surface plasmon resonance). This also limits their application in biosensing, especially for low-resource settings, where detection of pathogens based on glycan binding could speed up diagnosis. Here we employ a library-oriented approach to immobilise a range of monosaccharides onto polymer-stabilised gold nanoparticles to enable rapid and high-throughput evaluation of their binding specificities with a panel of lectins...
May 14, 2016: Journal of Materials Chemistry. B, Materials for Biology and Medicine
https://www.readbyqxmd.com/read/27429755/peptide-glycosaminoglycan-hybrid-hydrogels-as-an-injectable-intervention-for-spinal-disc-degeneration
#14
D E Miles, E A Mitchell, N Kapur, P A Beales, R K Wilcox
Degeneration of the spinal discs is a major cause of back pain. During the degeneration process, there is a loss of glycosaminoglycans (GAGs) from the proteoglycan-rich gel in the disc's nucleus, which adversely alters biomechanical performance. Current surgical treatments for back pain are highly invasive and have low success rates; there is an urgent need for minimally-invasive approaches that restore the physiological mechanics of the spine. Here we present an injectable peptide:GAG hydrogel that rapidly self-assembles in situ and restores the mechanics of denucleated intervertebral discs...
May 11, 2016: Journal of Materials Chemistry. B, Materials for Biology and Medicine
https://www.readbyqxmd.com/read/27152196/a-multifunctional-poly-curcumin-nanomedicine-for-dual-modal-targeted-delivery-intracellular-responsive-release-dual-drug-treatment-and-imaging-of-multidrug-resistant-cancer-cells
#15
Jining Wang, Feihu Wang, Fangzhou Li, Wenjun Zhang, Yuanyuan Shen, Dejian Zhou, Shengrong Guo
A multifunctional anti-cancer nanomedicine based on a biotin-poly(ethylene glycol)-poly(curcumin-dithio dipropionic acid) (Biotin-PEG-PCDA) polymeric nanocarrier loaded with paclitaxel (PTX), magnetic nanoparticles (MNPs) and quantum dots (QDs) is developed. It combines advantageous properties of efficient targeted delivery and uptake (via biotin and MNP), intracellular responsive release (via cleavable PCDA polymer), fluorescence imaging (via QD) and combined PTX-curcumin dual-drug treatment, allowing for overcoming drug resistance mechanisms of model multidrug resistant breast cancer cells (MCF-7/ADR)...
May 7, 2016: Journal of Materials Chemistry. B, Materials for Biology and Medicine
https://www.readbyqxmd.com/read/27563436/modulating-in-vivo-degradation-rate-of-injectable-extracellular-matrix-hydrogels
#16
Jean W Wassenaar, Rebecca L Braden, Kent G Osborn, Karen L Christman
Extracellular matrix (ECM) derived hydrogels are increasingly used as scaffolds to stimulate endogenous repair. However, few studies have examined how altering the degradation rates of these materials affect cellular interaction in vivo. This study sought to examine how crosslinking or matrix metalloproteinase (MMP) inhibition by doxycycline could be employed to modulate the degradation rate of an injectable hydrogel derived from decellularized porcine ventricular myocardium. While both approaches were effective in reducing degradation in vitro, only doxycycline significantly prolonged hydrogel degradation in vivo without affecting material biocompatibility...
April 28, 2016: Journal of Materials Chemistry. B, Materials for Biology and Medicine
https://www.readbyqxmd.com/read/27453781/ultrastrong-and-flexible-hybrid-hydrogels-based-on-solution-self-assembly-of-chitin-nanofibers-in-gelatin-methacryloyl-gelma
#17
P Hassanzadeh, M Kazemzadeh-Narbat, R Rosenzweig, X Zhang, A Khademhosseini, N Annabi, M Rolandi
We demonstrate ultrastrong and flexible hydrogels by self-assembling chitin nanofiber in the presence of gelatin methacryloyl. We tune the mechanical properties of the hydrogel with chitin nanofiber content and show proof-of-concept applications in engineering vascular tissue.
April 21, 2016: Journal of Materials Chemistry. B, Materials for Biology and Medicine
https://www.readbyqxmd.com/read/27073688/biodistribution-and-fate-of-core-labeled-125-i-polymeric-nanocarriers-prepared-by-flash-nanoprecipitation-fnp
#18
Christina Tang, Jasmine Edelstein, John L Mikitsh, Edward Xiao, Aaron H Hemphill, Robert Pagels, Ann-Marie Chacko, Robert Prud'homme
Non-invasive medical imaging techniques such as positron emission tomography (PET) imaging are powerful platforms to track the fate of radiolabeled materials for diagnostic or drug delivery applications. Polymer-based nanocarriers tagged with non-standard PET radionuclides with relatively long half-lives (e.g. (64)Cu: t1/2 = 12.7 h, (76)Br: t1/2 = 16.2h, (89)Zr: t1/2 = 3.3 d, (124)I: t1/2 = 4.2 d) may greatly expand applications of nanomedicines in molecular imaging and therapy. However, radiolabeling strategies that ensure stable in vivo association of the radiolabel with the nanocarrier remain a significant challenge...
April 14, 2016: Journal of Materials Chemistry. B, Materials for Biology and Medicine
https://www.readbyqxmd.com/read/27458521/the-immobilization-of-a-direct-thrombin-inhibitor-to-a-polyurethane-as-a-nonthrombogenic-surface-coating-for-extracorporeal-circulation
#19
Jane Yu, Elizabeth Brisbois, Hitesh Handa, Gail Annich, Mark Meyerhoff, Robert Bartlett, Terry Major
A biomaterial with both antithrombin and antiplatelet properties is the ideal surface for use in extracorporeal circulation (ECC) as it targets both fibrin generation and platelet adhesion. A hemocompatible surface coating avoids the need for systemic anticoagulation by providing a local anticoagulant effect at the polymer-blood interface. Previous work has demonstrated the potential use of argatroban, a direct thrombin inhibitor, as a nonthrombogenic material for extracorporeal devices. The work reported here focuses on the characterization of argatroban linked to a polyurethane-silicone polymer, CarboSil®...
April 7, 2016: Journal of Materials Chemistry. B, Materials for Biology and Medicine
https://www.readbyqxmd.com/read/27453783/materials-design-at-the-interface-of-nanoparticles-and-innate-immunity
#20
Gregory Lee Szeto, Erin B Lavik
No abstract text is available yet for this article.
March 7, 2016: Journal of Materials Chemistry. B, Materials for Biology and Medicine
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