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Biomaterials Science

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https://www.readbyqxmd.com/read/28643840/synchronization-of-excitable-cardiac-cultures-of-different-origin
#1
N N Agladze, O V Halaidych, V A Tsvelaya, T Bruegmann, C Kilgus, P Sasse, K I Agladze
In the present work, we investigated the synchronization of electrical activity in cultured cardiac cells of different origin put in direct contact. In the first set of experiments synchronization was studied in the primary culture cells of neonatal rats taken at different developmental ages, and in the second - in the neonatal rat cardiomyocytes and HL-1 cells. The electrical excitation of cells was recorded using the calcium transient marker Fluor-4. In the confluent cell layers created with the aid of a specially devised mask, the excitation waves and their propagation between areas occupied by cells of different origin were observed...
June 23, 2017: Biomaterials Science
https://www.readbyqxmd.com/read/28643827/anti-oxidant-and-immune-modulatory-properties-of-sulfated-alginate-derivatives-on-human-chondrocytes-and-macrophages
#2
Anne Kerschenmeyer, Øystein Arlov, Vera Malheiro, Matthias Steinwachs, Markus Rottmar, Katharina Maniura-Weber, Gemma Palazzolo, Marcy Zenobi-Wong
Degeneration of articular cartilage represents one of the most common causes of pain and disability in our aging society. Current treatments only address the symptoms of joint disease, but not their underlying causes which include oxidative stress and inflammation in cartilage and surrounding tissues. Sulfated biopolymers that mimic aspects of the native extracellular environment of cartilage are recently gaining interest as a means to slow the inflammatory events responsible for tissue degeneration. Here we show that the natural polysaccharide alginate and particularly its sulfated derivatives have potent anti-oxidant, anti-inflammatory and anti-immunogenic properties in vitro...
June 23, 2017: Biomaterials Science
https://www.readbyqxmd.com/read/28636048/supramolecular-surface-functionalization-via-catechols-for-the-improvement-of-cell-material-interactions
#3
S Spaans, P P K H Fransen, B D Ippel, D F A de Bont, H M Keizer, N A M Bax, C V C Bouten, P Y W Dankers
Optimization of cell-material interactions is crucial for the success of synthetic biomaterials in guiding tissue regeneration. To do so, catechol chemistry is often used to introduce adhesiveness into biomaterials. Here, a supramolecular approach based on ureido-pyrimidinone (UPy) modified polymers is combined with catechol chemistry in order to achieve improved cellular adhesion onto supramolecular biomaterials. UPy-modified hydrophobic polymers with non-cell adhesive properties are developed that can be bioactivated via a modular approach using UPy-modified catechols...
June 21, 2017: Biomaterials Science
https://www.readbyqxmd.com/read/28632279/%C3%AE%C2%B5-polylysine-based-thermo-responsive-adsorbents-for-immunoglobulin-adsorption-desorption-under-mild-conditions
#4
Masashi Maruyama, Keisuke Shibuya
Thermo-responsive adsorbents for immunoglobulin G (IgG) employing ε-polylysine (EPL) as a polymer backbone were developed. The introduction of mercaptoethylpyridine (MEP) as an IgG-binding ligand and hydrophobization of side chains afforded thermo-responsive IgG adsorbents, whose thermo-responsive IgG desorption ratio was up to 88% (EPL/MEP derivative 3m). The changes in surface densities of active MEP groups, which are caused by thermal conformational changes of the adsorbents, play key roles for IgG desorption...
June 20, 2017: Biomaterials Science
https://www.readbyqxmd.com/read/28631779/recent-advances-in-nanomedicines-for-the-treatment-of-rheumatoid-arthritis
#5
REVIEW
Qin Wang, Xun Sun
Rheumatoid arthritis (RA) is a severe systemic inflammatory disease. It is often associated with serious cartilage destruction and massive inflammatory infiltration, which might ultimately cause disability, wide complications and reduced life quality. Current clinical treatments of RA show several drawbacks such as high doses, frequent administration and serious side effects. These limitations have motivated tremendous expansion of the research and application of nanomedicines in RA therapy. In this review, we summarize the cutting edge progress in nanomedicines for the treatment of RA and discuss the application of various targeting strategies...
June 20, 2017: Biomaterials Science
https://www.readbyqxmd.com/read/28630964/an-insertion-self-fusion-mechanism-for-cell-membrane-immobilization-on-porous-silica-beads-to-fabricate-biomimic-carriers
#6
Xu Wang, Liang Xu, Ruizhi Mao, Xinchao Zhao, Bei Xu, Cheng Tang, Jiahui He, Yanwen Zhang
Immobilization of membrane proteins on solid supports with high stability, favorable reusability and prevention of contamination is of great interest in nanobiology and medicine. Cell membrane coating technology enables the membrane proteins associated with their surrounding membranes to co-immobilize onto the solid matrix, largely enhancing the loading efficiency and conserving the bioactivity of the membrane proteins. Herein, we systematically illustrate the mechanism of cell membrane immobilization on porous silica beads, facilitating the fabricated biomimic carriers applied for chromatography...
June 20, 2017: Biomaterials Science
https://www.readbyqxmd.com/read/28617486/ultra-high-loading-of-sinoporphyrin-sodium-in-ferritin-for-single-wave-motivated-photothermal-and-photodynamic-co-therapy
#7
Chao Huang, Chengchao Chu, Xiaoyong Wang, Huirong Lin, Junqing Wang, Yun Zeng, Wenzhen Zhu, Yi-Xiang J Wang, Gang Liu
In this work, a potent photosensitizer, sinoporphyrin sodium (DVDMS), was loaded into RGD-modified ferritin (R-Fn) nanocages by a rapid, scalable and versatile approach for imaging guided photodynamic and photothermal (PTT/PDT) co-therapy. The resulting nanocomposite formed a well-defined nanocage with a photosensitizer loading capacity as high as 66.67 wt%, which far exceeds those reported previously. The bioengineered protein nanocage-based nanotheranostics exhibits a remarkably improved tumor treatment effect over DVDMS with good biocompatibility and the potential of clinical translation...
June 15, 2017: Biomaterials Science
https://www.readbyqxmd.com/read/28616946/glycocalyx-scaffolding-with-synthetic-nanoscale-glycomaterials
#8
Mia L Huang, Sean C Purcell, Stephen Verespy Iii, Yinan Wang, Kamil Godula
We report a method for programming complexity into the glycocalyx of live cells. Via a combination of glycomaterial synthesis and membrane remodeling, we have engineered cells to display native-like, mixed sialoglycan populations, while confining the activity of each glycan into a specific nanoscale presentation.
June 15, 2017: Biomaterials Science
https://www.readbyqxmd.com/read/28612879/cell-migration-on-material-driven-fibronectin-microenvironments
#9
E Grigoriou, M Cantini, M J Dalby, A Petersen, M Salmeron-Sanchez
Cell migration is a fundamental process involved in a wide range of biological phenomena. However, how the underlying mechanisms that control migration are orchestrated is not fully understood. In this work, we explore the migratory characteristics of human fibroblasts using different organisations of fibronectin (FN) triggered by two chemically similar surfaces, poly(ethyl acrylate) (PEA) and poly(methyl acrylate) (PMA); cell migration is mediated via an intermediate layer of fibronectin (FN). FN is organised into nanonetworks upon simple adsorption on PEA whereas a globular conformation is observed on PMA...
June 14, 2017: Biomaterials Science
https://www.readbyqxmd.com/read/28612067/stretch-dependent-changes-in-molecular-conformation-in-fibronectin-nanofibers
#10
John M Szymanski, Emily N Sevcik, Kairui Zhang, Adam W Feinberg
Fibronectin (FN) is an extracellular matrix (ECM) glycoprotein that plays an important role in a wide range of biological processes including embryonic development, wound healing, and fibrosis. Recent evidence has demonstrated that FN is mechanosensitive, where the application of force induces conformational changes within the FN molecule to expose otherwise cryptic binding domains. However, it has proven technically challenging to dynamically monitor how the nanostructure of FN fibers changes as a result of force-induced extension, due in part to the inherent complexity of FN networks within tissue and cell-generated extracellular matrix (ECM)...
June 14, 2017: Biomaterials Science
https://www.readbyqxmd.com/read/28604857/microfluidic-fabrication-of-polyethylene-glycol-microgel-capsules-with-tailored-properties-for-the-delivery-of-biomolecules
#11
Luis P B Guerzoni, Jan Bohl, Alexander Jans, Jonas C Rose, Jens Koehler, Alexander J C Kuehne, Laura De Laporte
Microfluidic encapsulation platforms have great potential not only in pharmaceutical applications but also in the consumer products industry. Droplet-based microfluidics is increasingly used for the production of monodisperse polymer microcapsules for biomedical applications. In this work, a microfluidic technique is developed for the fabrication of monodisperse double emulsion droplets, where the shell is crosslinked into microgel capsules. A six-armed acrylated star-shaped poly(ethylene oxide-stat-propylene oxide) pre-polymer is used to form the microgel shell after a photo-initiated crosslinking reaction...
June 12, 2017: Biomaterials Science
https://www.readbyqxmd.com/read/28597890/an-in-vivo-study-on-bone-formation-behavior-of-microporous-granular-calcium-phosphate
#12
G M L Dalmônico, P F Franczak, N Levandowski, N H A Camargo, A L Dallabrida, B D da Costa, O García Gil, O Cambra-Moo, M A Rodríguez, M Canillas
This study was developed based on in vivo investigation of microporous granular biomaterials based on calcium phosphates, involving matrices of β-tricalcium phosphate (β-TCP), hydroxyapatite (HA), biphasic compositions of both phases and a control group. The physicochemical characterization of materials was carried out by X-Ray diffraction (DRX) and mercury porosimetry. Biodegradability, bioactivity and neoformation processes were investigated by Raman spectroscopy, scanning electron microscopy (SEM) and polarized light conducted on biopsies obtained from in vivo tests for periods of 90 and 180 days...
June 9, 2017: Biomaterials Science
https://www.readbyqxmd.com/read/28594019/recent-progress-in-the-biomedical-applications-of-polydopamine-nanostructures
#13
REVIEW
Rahila Batul, Tasnuva Tamanna, Abdul Khaliq, Aimin Yu
Polydopamine is a dark brown-black insoluble biopolymer produced by autoxidation of dopamine. Although its structure and polymerization mechanism have not been fully understood, there has been a rapid growth in the synthesis and applications of polydopamine nanostructures in biomedical fields such as drug delivery, photothermal therapy, bone and tissue engineering, and cell adhesion and patterning, as well as antimicrobial applications. This article is dedicated to reviewing some of the recent polydopamine developments in these biomedical fields...
June 8, 2017: Biomaterials Science
https://www.readbyqxmd.com/read/28594018/biodegradable-injectable-polymer-systems-exhibiting-a-longer-and-controllable-duration-time-of-the-gel-state
#14
Yasuyuki Yoshida, Hiroki Takai, Keisuke Kawahara, Shintaro Mitsumune, Kazuyuki Takata, Akinori Kuzuya, Yuichi Ohya
Here, we report biodegradable temperature-triggered covalent gelation systems exhibiting a longer and controllable duration time of the gel state by a "mixing strategy" utilizing a thiol-ene reaction. We synthesized a tri-block copolymer of poly(caprolactone-co-glycolic acid) and PEG (tri-PCG) as a temperature-responsive injectable polymer (IP) and attached acryloyl groups on both termini (tri-PCG-Acryl). A tri-PCG micelle solution containing hydrophobic hexa-functional polythiol (Solution-A) and a tri-PCG-Acryl micelle solution (Solution-B) were mixed together...
June 8, 2017: Biomaterials Science
https://www.readbyqxmd.com/read/28589998/magnetic-field-application-or-mechanical-stimulation-via-magnetic-microparticles-does-not-enhance-chondrogenesis-in-mesenchymal-stem-cell-sheets
#15
A D Dikina, B P Lai, M Cao, M Zborowski, E Alsberg
Using a novel magnetic field bioreactor, this work evaluated the chondrogenesis of scaffold-free human mesenchymal stem cell sheets in response to static and variable magnetic fields, as well as mechanical stimulation via 4.4 μm magnetic particles. Neither static nor variable magnetic fields generated by 1.44-1.45 T permanent magnets affected cartilage formation. Notably, magnetic field-induced mechanical stimulation by magnetic particles, which applied forces to the cells and ECM statically (4.39 pN) or cyclically (1...
June 7, 2017: Biomaterials Science
https://www.readbyqxmd.com/read/28589987/emerging-strategies-in-near-infrared-light-triggered-drug-delivery-using-organic-nanomaterials
#16
Ai Lin Chin, Yongliang Zhong, Rong Tong
Near-infrared light has significant advantages for light-triggered drug delivery systems within deep tissues. The use of inorganic nanomaterials raises concern over their long-term in vivo toxicities. Here we will highlight emerging near-infrared light-triggered drug delivery using organic nanomaterials, as well as new photocleavage reactions mediated by near-infrared light.
June 7, 2017: Biomaterials Science
https://www.readbyqxmd.com/read/28589986/formation-and-dynamics-of-endoplasmic-reticulum-like-lipid-nanotube-networks
#17
Taylan Bilal, Irep Gözen
We report on the self-organized formation and dynamics of artificial lipid nanotube networks, which, in terms of morphology and behavior, resemble the endoplasmic reticulum(ER) of biological cells. The networks, initially generated from a solid-supported planar phospholipid membrane, undergo a morphological transformation, triggered by the chelation and removal of Ca(2+) from the environment surrounding the membrane. Calcium depletion gradually causes de-pinning, thus de-wetting, at the membrane-substrate interface...
June 7, 2017: Biomaterials Science
https://www.readbyqxmd.com/read/28589978/controlled-ros-production-by-corannulene-the-vehicle-makes-a-difference
#18
Limei Zhang, Xiaopeng Dong, Di Lu, Sihui Liu, Dan Ding, Deling Kong, Aiping Fan, Zheng Wang, Yanjun Zhao
Curved corannulene (Cor) can produce reactive oxygen species (ROS) in a controlled manner due to the large dipole moment. However, the poor aqueous solubility of Cor necessitates the employment of solubilization vehicles. This work revealed that PEGylation was less efficient than the cyclodextrin complexation regarding ROS production.
June 7, 2017: Biomaterials Science
https://www.readbyqxmd.com/read/28589972/the-influence-of-tumor-induced-immune-dysfunction-on-the-immune-cell-distribution-of-gold-nanoparticles-in-vivo
#19
Chenxi Wu, Hongmei Chen, Xuan Wu, Xiuxiu Cong, Li Wang, Yucai Wang, Yongguang Yang, Wei Li, Tianmeng Sun
Gold nanoparticles (AuNPs) have been extensively explored as a drug carrier and have been widely used to provide advanced biomedical research tools in diagnostic imaging and therapy for cancer. Although the mononuclear phagocyte system and immune system are known to play the main roles in the clearance of AuNPs during the circulation, the particle distribution within the immune cells under the condition of immune dysfunction caused by tumor growth has not been thoroughly studied. Here, the cellular distribution of Cy5 labeled AuNPs with diameters of 5, 30 and 50 nm is characterized within the immune populations of the blood, spleen and bone marrow from tumor free and tumor bearing mice using flow cytometry...
June 7, 2017: Biomaterials Science
https://www.readbyqxmd.com/read/28584885/viscoelastic-hydrogels-for-3d-cell-culture
#20
Ovijit Chaudhuri
In tissues, many cells are surrounded by and interact with a three-dimensional soft extracellular matrix (ECM). Both the physical and biochemical properties of the ECM play a major role in regulating cell behaviours. To better understand the impact of ECM properties on cell behaviours, natural and synthetic hydrogels have been developed for use as synthetic ECMs for 3D cell culture. It has long been known that ECM and tissues are viscoelastic, or display a time-dependent response to deformation or mechanical loading, exhibiting stress relaxation and creep...
June 6, 2017: Biomaterials Science
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