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Biofabrication

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https://www.readbyqxmd.com/read/29019465/facile-and-controllable-electrochemical-fabrication-of-cell-adhesive-polypyrrole-electrodes-using-pyrrole-rgd-peptides
#1
Lindy K Jang, Semin Kim, Jiwon Seo, Jae Young Lee
Electrically conductive polymers, such as polypyrrole (PPy), have been widely used for the fabrication of various biosensors and tissue engineering scaffolds. For their biologically relevant applications, conductive biomaterials capable of intimate cellular interactions are highly desired. However, conventional methods to incorporate biomolecules into conductive polymers do not offer fine and easy control over the surface density of the biomolecules and/or their stability. We present a novel method to electrochemically immobilize cell adhesive Arg-Gly-Asp (RGD) ligands on PPy electrode surfaces with a simple control over the peptide surface density by varying the electrodeposition time...
October 11, 2017: Biofabrication
https://www.readbyqxmd.com/read/28990579/bone-matrix-production-in-hydroxyapatite-modified-hydrogels-suitable-for-bone-bioprinting
#2
Annika Wenz, Kirsten Borchers, Günter E M Tovar, Petra Kluger
Though bioprinting is a forward-looking approach in bone tissue engineering, the development of bioinks which are on the one hand processable with the chosen printing technique, and on the other hand possess the relevant mechanical as well as osteoconductive features remains a challenge. In the present study, polymer solutions based on methacrylated gelatin and methacrylated hyaluronic acid modified with hydroxyapatite particles (5 wt%) were prepared. Encapsulation of primary human adipose-derived stem cells in the hydroxyapatite-containing gels and culture for 28 days resulted in a storage moduli significantly increased to126...
October 9, 2017: Biofabrication
https://www.readbyqxmd.com/read/28976366/recombinant-spider-silk-based-bioinks
#3
Elise DeSimone, Kristin Schacht, Alexandra Pellert, Thomas Scheibel
Bioinks, 3D cell culture systems which can be printed, are still in the early development stages. Currently, extensive research is going into designing printers to be more accommodating to bioinks, designing scaffolds with stiff materials as support structures for the often soft bioinks, and modifying the bioinks themselves. Recombinant spider silk proteins, a potential biomaterial component for bioinks, have high biocompatibility, can be processed into several morphologies and can be modified with cell adhesion motifs to enhance their bioactivity...
October 4, 2017: Biofabrication
https://www.readbyqxmd.com/read/28976364/assessing-bioink-shape-fidelity-to-aid-material-development-in-3d-bioprinting
#4
Alexandre Ribeiro, Maarten Michiel Blokzijl, Riccardo Levato, Claas Willem Visser, Miguel Castilho, Wim E Hennink, Tina Vermonden, Jos Malda
During extrusion-based bioprinting, the deposited bioink filaments are subjected to deformations, such as collapse of overhanging filaments, which compromises the ability to stack several layers of bioink, and fusion between adjacent filaments, which compromises the resolution and maintenance of a desired pore structure. When developing new bioinks, approaches to assess their shape fidelity after printing would be beneficial to evaluate the degree of deformation of the deposited filament and to estimate how similar the final printed construct would be to the design...
October 4, 2017: Biofabrication
https://www.readbyqxmd.com/read/28976359/automated-fabrication-of-hydrogel-microfibers-with-tunable-diameters-for-controlled-cell-alignment
#5
You Yang, Xiaolu Liu, Dan Wei, Meiling Zhong, Jing Sun, Likun Guo, Hongsong Fan, Xingdong Zhang
A newly designed spinning device was utilized to produce continuous hydrogel microfibers with tunable diameters. It was found that the diameter of microfiber was dependent on perfusion speed and coagulation wheel rotation rate. Their correlation was finally described by a mathematical expression and proved to be useful for a size-tunable spinning technique. Based on the controllable fabrication of hydrogel microfibers with desired size, microfiber/cell size-dependent cellular orientated spreading was studied by using PC12 and L929 as model cells...
October 4, 2017: Biofabrication
https://www.readbyqxmd.com/read/28976356/creating-hierarchical-porosity-hydroxyapatite-scaffold-with-osteoinduction-by-three-dimensional-printing-and-microwave-sintering
#6
Xuan Pei, Liang Ma, Boqing Zhang, Jianxun Sun, Yong Sun, Yujiang Fan, Zhongru Gou, Changchun Zhou, Xingdong Zhang
Hierarchical porosity, which includes micropores and macropores in scaffolds, contributes to important multiple biological functions for tissue regeneration. This paper introduced a two-step method of combining three-dimensional printing (3DP) and microwave sintering to fabricate two-level hierarchical porous scaffolds. The results showed that 3D printing made the macroporous structure well-controlled and microwave sintering generated micropores on macropore surface. The resulting hierarchical macro-/micro-porous hydroxyapatite scaffold induced bone formation following intramuscular implantation...
October 4, 2017: Biofabrication
https://www.readbyqxmd.com/read/28975895/pla-short-i-sub-micron-fibers-i-reinforcement-of-3d-bioprinted-alginate-constructs-for-cartilage-regeneration
#7
Alicja Kosik-Kozioł, Marco Costantini, Tomasz Bolek, Krisztina Szoke, Andrea Barbetta, Jan E Brinchmann, Wojciech Święszkowski
In this study, we present an innovative strategy to reinforce 3D printed hydrogel constructs for cartilage tissue engineering by formulating composite bioinks containing alginate and short sub-micron polylactide (PLA) fibers. We demonstrate that Young's modulus obtained for pristine alginate constructs (6.9 ± 1.7 kPa) can be increased threefold (up to 25.1 ± 3.8 kPa) with the addition of PLA short fibers. Furthermore, to assess the performance of such materials in cartilage tissue engineering, we loaded the bioinks with human chondrocytes and cultured in vitro the bioprinted constructs for up to 14 days...
October 4, 2017: Biofabrication
https://www.readbyqxmd.com/read/28930091/proposal-to-assess-printability-of-bioinks-for-extrusion-based-bioprinting-and-evaluation-of-rheological-properties-governing-bioprintability
#8
Naomi Claire Paxton, Willi Smolan, Thomas Böck, Ferry P W Melchels, Juergen Groll, Tomasz Juengst
The development and formulation of printable inks for extrusion-based 3D bioprinting has been a major challenge in the field of biofabrication. Inks, often polymer solutions with the addition of crosslinking to form hydrogels, must not only display adequate mechanical properties for the chosen application, but also show high biocompatibility as well as printability. Here we describe a reproducible two-step method for the assessment of the printability of inks for bioprinting, focussing firstly on screening ink formulations to assess fibre formation and the ability to form 3D constructs before presenting a method for the rheological evaluation of inks to characterise the yield point, shear thinning and recovery behaviour...
September 20, 2017: Biofabrication
https://www.readbyqxmd.com/read/28930090/biomimetic-matrix-fabricated-by-lmp-1-gene-transduced-mc3t3-e1-cells-for-bone-regeneration
#9
Junxuan Ma, Wei Guo, Manman Gao, Baoding Huang, Qihua Qi, Zemin Ling, Yan Chen, Hao Hu, Hailian Zhou, Fei Yu, Ke Chen, Zhiyu Zhou, Deming Xiao, Xuenong Zou
Bone healing is regulated by multiple microenvironmental signals provided by the extracellular matrix (ECM). The study aimed to mimic native osteoinductive microenvironment by developing an ECM using gene-transduced cells. LIM mineralization protein-1 (LMP-1) gene was transferred to the murine pre-osteoblast cells (MC3T3-E1) using lentiviral vectors. Western blotting essay indicated that the MC3T3-E1 cells expressed an increased level of bone morphologic protein-2, -4 and-7 (BMP-2, -4 and -7) after LMP-1 gene transduction...
September 20, 2017: Biofabrication
https://www.readbyqxmd.com/read/28906257/double-printing-of-hyaluronic-acid-poly-glycidol-hybrid-hydrogels-with-poly-%C3%AE%C2%B5-caprolactone-for-msc-chondrogenesis
#10
Simone Stichler, Thomas Böck, Naomi Claire Paxton, Sarah Bertlein, Riccardo Levato, Verena Schill, Willi Smolan, Jos Malda, Joerg Tessmar, Torsten Blunk, Juergen Groll
This study investigates the use of allyl-functionalized poly(glycidol)s (P(AGE-co-G)) as cytocompatible cross-linker for thiol-functionalized hyaluronic acid (HA-SH) and the optimization of this hybrid hydrogel as bioink for 3D bioprinting. Chemical cross-linking of gels with 10 wt.% overall polymer concentration was achieved by UV-induced radical thiol-ene coupling between the thiol and allyl groups. Addition of unmodified high molecular weight HA (1.36 MDa) allowed tuning of the rheology for extrusion based bioprinting...
September 14, 2017: Biofabrication
https://www.readbyqxmd.com/read/28837043/a-3d-printed-microfluidic-perfusion-device-for-multicellular-spheroid-cultures
#11
Louis Ong, Anik Badhan Islam, Ramanuj DasGupta, Narayanan Gopalakrishna Iyer, Hwa Liang Leo, Yi-Chin Toh
The advent of 3D printing technologies promises to make microfluidic organ-on-chip technologies more accessible for the biological research community. To date, hydrogel-encapsulated cells have been successfully incorporated into 3D printed microfluidic devices. However, there is currently no 3D printed microfluidic device that can support multicellular spheroid culture, which facilitates extensive cell-cell contacts important for recapitulating many multicellular functional biological structures. Here, we report a first instance of fabricating a 3D printed microfluidic cell culture device capable of directly immobilizing and maintaining the viability and functionality of 3D multicellular spheroids...
August 24, 2017: Biofabrication
https://www.readbyqxmd.com/read/28837040/green-bioprinting-extrusion-based-fabrication-of-plant-cell-laden-biopolymer-hydrogels-scaffolds
#12
Julia Seidel, Tilman Ahlfeld, Max Adolph, Sibylle Kümmritz, Juliane Steingroewer, Felix Krujatz, Thomas Bley, Michael Gelinsky, Anja Lode
Plant cell cultures produce active agents for pharmaceuticals, food and cosmetics. However, up to now process control for plant cell suspension cultures is challenging. A positive impact of cell immobilization, such as encapsulation in hydrogel beads, on secondary metabolites production has been reported for several plant species. The aim of this work was to develop a method for bioprinting of plant cells in order to allow fabrication of free-formed three-dimensional matrices with defined internal pore architecture for in depth characterization of immobilization conditions, cell agglomeration and interactions...
August 24, 2017: Biofabrication
https://www.readbyqxmd.com/read/28812983/a-microfluidic-platform-for-modeling-metastatic-cancer-cell-matrix-invasion
#13
Laura Blaha, Chentian Zhang, Mario Cabodi, Joyce Y Wong
Invasion of the extracellular matrix is a critical step in the colonization of metastatic tumors. The invasion process is thought to be driven by both chemokine signaling and interactions between invading cancer cells and physical components of the metastatic niche, including endothelial cells that line capillary walls and serve as a barrier to both diffusion and invasion of the underlying tissue. Transwell chambers, a tool for generating artificial chemokine gradients to induce cell migration, have facilitated recent work to investigate the chemokine contributions to matrix invasion...
August 16, 2017: Biofabrication
https://www.readbyqxmd.com/read/28812982/quantitative-criteria-to-benchmark-new-and-existing-bio-inks-for-cell-compatibility
#14
Karen Dubbin, Anthony Tabet, Sarah Heilshorn
Recent advancements in 3D bioprinting have led to the fabrication of more complex, more precise, and larger printed tissue constructs. As the field continues to advance, it is critical to develop quantitative benchmarks to compare different bio-inks for key cell-biomaterial interactions, including (1) cell sedimentation within the ink cartridge, (2) cell viability during extrusion, and (3) cell viability after ink curing. Here we develop three simple protocols for quantitative analysis of bio-ink performance...
August 16, 2017: Biofabrication
https://www.readbyqxmd.com/read/28795951/gelma-collagen-blends-enable-drop-on-demand-3d-printablility-and-promote-angiogenesis
#15
Henrike Stratesteffen, Marius Johannes Köpf, Franziska Kreimendahl, Andreas Blaeser, Stefan Jockenhoevel, Horst Fischer
Effective vascularization is crucial for three dimensional (3D) printed hydrogel-cell constructs to efficiently supply cells with oxygen and nutrients. Till date, several hydrogel blends have been developed that allow the in vitro formation of a capillary-like network within the gels but comparatively less effort has been made to improve the suitability of the materials for a 3D bioprinting process. Therefore, we hypothesize that tailored hydrogel blends of photo-crosslinkable gelatin and type I collagen exhibit favorable 3D drop-on-demand printing characteristics in terms of rheological and mechanical properties and that further capillary-like network formation can be induced by co-culturing human umbilical vein endothelial cells (HUVEC) and human mesenchymal stem cells (hMSC) within the proposed blends...
August 10, 2017: Biofabrication
https://www.readbyqxmd.com/read/28837041/laser-processing-of-protein-films-as-a-method-for-accomplishment-of-cell-patterning-at-the-microscale
#16
Ariadne Prigipaki, Katerina Papanikolopoulou, Estelle Mossou, Edward P Mitchell, V Trevor Forsyth, Alexandros Selimis, Anthi Ranella, Anna Mitraki
In this study, we propose a photostructuring approach for protein films based on a treatment with nanosecond pulses of a KrF excimer laser. As a model protein we used an amyloid fibril-forming protein. Laser treatment induced a foaming of the sample surface exhibiting an interconnected fibrous mesh with a high degree of control and precision. The surface foaming was well characterized by scanning electron microscopy, atomic force microscopy, laser induced fluorescence and contact angle measurements. The laser irradiated areas of the protein films acquired new morphological and physicochemical properties that could be exploited to fulfill unmet challenges in the tissue engineering field...
September 7, 2017: Biofabrication
https://www.readbyqxmd.com/read/28752825/dc-biased-low-frequency-insulating-constriction-dielectrophoresis-for-protein-biomolecules-concentration
#17
Peng Zhang, Yuxin Liu
Sample enrichment or molecules concentration is considered an essential step in sample processing of miniaturized devices aimed at biosensing and bioanalysis. Among all the means involved to achieve this aim, dielectrophoresis (DEP) is increasingly employed in molecules manipulation and concentration because it is non-destructive and high efficiency. This paper presents a methodology to achieve protein concentration utilizing the combination effects of electrokinetics and low frequency insulating dielectrophoresis (iDEP) generated within a microfluidic device, in which a submicron constricted channel was fabricated using DNA molecular combing and replica molding...
September 1, 2017: Biofabrication
https://www.readbyqxmd.com/read/28770808/comparative-study-of-gelatin-methacrylate-hydrogels-from-different-sources-for-biofabrication-applications
#18
Zongjie Wang, Zhenlin Tian, Fredric Menard, Keekyoung Kim
Gelatin methacrylate (GelMA) hydrogel is a promising bioink for biofabrication applications due to its cost-effectiveness, ease of synthesis and biocompatibility to allow cell adhesion. However, the GelMA synthesized from a widely used porcine skin gelatin has a thermal gelation problem at room temperature. Here, we present thermally stable GelMA hydrogels at room temperature while maintaining the mechanical and biological properties comparable to porcine GelMA. The novel GelMA hydrogels were synthesized from fish skin and cold soluble gelatin...
August 21, 2017: Biofabrication
https://www.readbyqxmd.com/read/28817384/engineering-the-mechanical-and-biological-properties-of-nanofibrous-vascular-grafts-for-in-situ-vascular-tissue-engineering
#19
Jeffrey J D Henry, Jian Yu, Aijun Wang, Randall Lee, Jun Fang, Song Li
Synthetic small diameter vascular grafts have a high failure rate, and endothelialization is critical for preventing thrombosis and graft occlusion. A promising approach is in situ tissue engineering, whereby an acellular scaffold is implanted and provides stimulatory cues to guide the in situ remodeling into a functional blood vessel. An ideal scaffold should have sufficient binding sites for biomolecule immobilization and a mechanical property similar to native tissue. Here we developed a novel method to blend low molecular weight (LMW) elastic polymer during electrospinning process to increase conjugation sites and to improve the mechanical property of vascular grafts...
August 17, 2017: Biofabrication
https://www.readbyqxmd.com/read/28770811/fabrication-of-arbitrary-3d-components-in-cardiac-surgery-from-macro-micro-to-nanoscale
#20
Ranjith Kumar Kankala, Kai Zhu, Jun Li, Chun-Sheng Wang, Shi-Bin Wang, Ai-Zheng Chen
Fabrication of tissue-/organ-like structures at arbitrary geometries by mimicking the properties of the complex material offers enormous interest to the research and clinical applicability in cardiovascular diseases. Patient-specific, durable, and realistic three-dimensional (3D) cardiac models for anatomic consideration have been developed for education, pro-surgery planning, and intra-surgery guidance. In cardiac tissue engineering (TE), 3D printing technology is the most convenient and efficient microfabrication method to create biomimetic cardiovascular tissue for the potential in vivo implantation...
August 3, 2017: Biofabrication
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