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https://www.readbyqxmd.com/read/28537502/suitability-of-different-natural-and-synthetic-biomaterials-for-dental-pulp-tissue-engineering
#1
Kerstin M Galler, Ferdinand Brandl, Susanne Kirchhof, Matthias Widbiller, Andreas Eidt, Wolfgang Buchalla, Achim Goepferich, Gottfried Schmalz
Dental pulp tissue engineering is possible after insertion of pulpal stem cells combined with a scaffold into empty root canals. Commonly used biomaterials are collagen or poly(lactic) acid, which are either difficult to modify or to insert into such a narrow space. New hydrogel scaffolds with bioactive, specifically tailored functions could optimize the conditions to engineer dental pulp. Different synthetic and natural hydrogels were tested for their suitability to engineer dental pulp. Two functionalized modifications of polyethylene glycol were developed in this study and compared to a self-assembling peptide as well as to collagen and fibrin...
May 24, 2017: Tissue Engineering. Part A
https://www.readbyqxmd.com/read/28537482/programmed-platelet-derived-growth-factor-%C3%AE-%C3%AE-and-bone-morphogenetic-protein-2-delivery-from-a-hybrid-calcium-phosphate-alginate-scaffold
#2
Emily A Bayer, Jahnelle Jordan, Riccardo Gottardi, Morgan Fedorchak, Prashant N Kumta, Steven Little
Bone tissue engineering requires the upregulation of several regenerative stages, including a critical early phase of angiogenesis. Previous studies have suggested that a sequential delivery of PDGF to BMP-2 could promote angiogenic tubule formation when delivered to in vitro co-cultures of human umbilical vein endothelial cells (HUVECs) and human mesenchymal stem cells (hMSCs). However, it was previously unclear that this PDGF to BMP-2 delivery schedule will result in cell migration into the scaffolding system and affect the later expression of bone markers...
May 24, 2017: Tissue Engineering. Part A
https://www.readbyqxmd.com/read/28532902/adipose-derived-delivery-vehicle-for-encapsulated-adipogenic-factors
#3
Christopher M Mahoney, Arta Kelmindi-Doko, Malik J Snowden, J Peter Rubin, Kacey G Marra
Hydrogels derived from adipose tissue extracellular matrix (AdECM) have shown potential in the ability to generate new adipose tissue in vivo. To further enhance adipogenesis, a composite adipose derived delivery system (CADDS) containing single- and double-walled dexamethasone encapsulated microspheres (SW and DW Dex MS) has been developed. Previously, our laboratory has published the use of Dex MS as an additive to enhance adipogenesis and angiogenesis in adipose tissue grafts. In the current work, AdECM and CADDS are extensively characterized, in addition to conducting in vitro cell culture analysis...
May 19, 2017: Acta Biomaterialia
https://www.readbyqxmd.com/read/28532113/nanofibers-of-human-tropoelastin-inspired-peptides-structural-characterization-and-biological-properties
#4
Valeria Secchi, Stefano Franchi, Marco Fioramonti, Giovanni Polzonetti, Giovanna Iucci, Brigida Bochicchio, Chiara Battocchio
Regenerative medicine is taking great advantage from the use of biomaterials in the treatments of a wide range of diseases and injuries. Among other biomaterials, self-assembling peptides are appealing systems due to their ability to spontaneously form nanostructured hydrogels that can be directly injected into lesions. Indeed, self-assembling peptide scaffolds are expected to behave as biomimetic matrices able to surround cells, to promote specific interactions, and to control and modify cell behavior by mimicking the native environment as well...
August 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28530207/fabrication-of-biomimetic-bone-grafts-with-multi-material-3d-printing
#5
Nicholas Sears, Prachi Dhavalikar, Michael Whitely, Elizabeth Cosgriff-Hernandez
Extrusion deposition is a versatile method for the 3D printing of biomaterials such as hydrogels, ceramics, and suspensions. Recently, a new class of emulsion inks were developed that can be used to create tunable, hierarchically porous materials with a cure-on-dispense method. Propylene fumarate dimethacrylate (PFDMA) was selected to fabricate bone grafts using this technology due to its established biocompatibility, osteoconductivity, and good compressive properties. Scaffolds fabricated from PFDMA emulsion inks displayed compressive modulus and yield strength of approximately 15 and 1 MPa, respectively...
May 22, 2017: Biofabrication
https://www.readbyqxmd.com/read/28530133/efficacy-of-a-self-assembling-peptide-hydrogel-spg-178-gel-for-bone-regeneration-and-three-dimensional-osteogenic-induction-of-dental-pulp-stem-cells
#6
Jun Tsukamoto, Keiko Naruse, Yusuke Nagai, Shuhei Kan, Nobuhisa Nakamura, Masaki Hata, Maiko Omi, Tatsuhide Hayashi, Tatsushi Kawai, Tatsuaki Matsubara
The aim of this study was to assess the efficacy of a self-assembling peptide hydrogel as a scaffold for bone regeneration. We used a neutral and injectable self-assembling peptide hydrogel, SPG-178-Gel. Bone defects (5 mm in diameter) in rat calvarial bones were filled with a mixture of alpha-modified Eagle's medium and the peptide hydrogel. Three weeks after surgery, soft X-ray and micro-computed tomography (micro-CT) images of the gel-treated bones showed new bone formations in the periphery and in central areas of the defects...
May 20, 2017: Tissue Engineering. Part A
https://www.readbyqxmd.com/read/28526887/increased-stem-cells-delivered-using-a-silk-gel-scaffold-complex-for-enhanced-bone-regeneration
#7
Xun Ding, Guangzheng Yang, Wenjie Zhang, Guanglong Li, Shuxian Lin, David L Kaplan, Xinquan Jiang
The low in vivo survival rate of scaffold-seeded cells is still a challenge in stem cell-based bone regeneration. This study seeks to use a silk hydrogel to deliver more stem cells into a bone defect area and prolong the viability of these cells after implantation. Rat bone marrow stem cells were mingled with silk hydrogels at the concentrations of 1.0 × 10(5)/mL, 1.0 × 10(6)/mL and 1.0 × 10(7)/mL before gelation, added dropwise to a silk scaffold and applied to a rat calvarial defect. A cell tracing experiment was included to observe the preservation of cell viability and function...
May 19, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28514893/cytocompatible-polyion-complex-gel-of-poly-pro-hyp-gly-for-simultaneous-rat-bone-marrow-stromal-cell-encapsulation
#8
Farah Nurlidar, Mime Kobayashi, Kayo Terada, Tsuyoshi Ando, Masao Tanihara
Polyion complex (PIC) gel of poly(Pro-Hyp-Gly) was successfully fabricated by simply mixing polyanion and polycation derivatives of poly(Pro-Hyp-Gly), a collagen-like polypeptide. The polyanion, succinylated poly(Pro-Hyp-Gly), and the polycation, arginylated poly(Pro-Hyp-Gly), contain carboxy (pKa = 5.2) and guanidinium (pKa = 12.4) groups, respectively. Mixing the polyanion and the polycation at physiological pH (pH = 7.4) resulted in PIC gel. The hydrogel formation was optimum at an equimolar ratio of carboxy to guanidinium groups, suggesting that ionic interaction is the main determinant for the hydrogel formation...
May 18, 2017: Journal of Biomaterials Science. Polymer Edition
https://www.readbyqxmd.com/read/28501713/an-in-situ-photocrosslinkable-platelet-rich-plasma-complexed-hydrogel-glue-with-growth-factor-controlled-release-ability-to-promote-cartilage-defect-repair
#9
Xiaolin Liu, Yunlong Yang, Xin Niu, Qiuning Lin, Bizeng Zhao, Yang Wang, Linyong Zhu
The repair of articular cartilage injury is a great clinical challenge. Platelet-rich plasma (PRP) has attracted much attention for the repair of articular cartilage injury, because it contains various growth factors that are beneficial for wound repair. However, current administration methods of PRP face many shortcomings, such as unstable biological fixation and burst release of growth factors, all of which will bring troubles to its application in the repair of articular cartilage and compromise its therapeutic efficacy...
May 10, 2017: Acta Biomaterialia
https://www.readbyqxmd.com/read/28486778/efficacy-of-thermoresponsive-photocrosslinkable-hydrogels-derived-from-decellularized-tendon-and-cartilage-extracellular-matrix-for-cartilage-tissue-engineering
#10
Benjamin B Rothrauff, Luca Coluccino, Riccardo Gottardi, Luca Ceseracciu, Silvia Scaglione, Luca Goldoni, Rocky S Tuan
Tissue engineering using adult mesenchymal stem cells (MSCs), a promising approach for cartilage repair, is highly dependent on the nature of the matrix scaffold. Thermoresponsive, photocrosslinkable hydrogels were fabricated by functionalizing pepsin-soluble decellularized tendon and cartilage extracellular matrices (ECM) with methacrylate groups. Methacrylated gelatin hydrogels served as controls. When seeded with human bone marrow mesenchymal stem cells (MSCs) and cultured in chondrogenic medium, methacrylated ECM hydrogels experienced less cell-mediated contraction, as compared against non-methacrylated ECM hydrogels...
May 9, 2017: Journal of Tissue Engineering and Regenerative Medicine
https://www.readbyqxmd.com/read/28481437/effective-light-directed-assembly-of-building-blocks-with-microscale-control
#11
Ngoc-Duy Dinh, Rongcong Luo, Maria Tankeh Asuncion Christine, Weikang Nicholas Lin, Wei-Chuan Shih, James Cho-Hong Goh, Chia-Hung Chen
Light-directed forces have been widely used to pattern micro/nanoscale objects with precise control, forming functional assemblies. However, a substantial laser intensity is required to generate sufficient optical gradient forces to move a small object in a certain direction, causing limited throughput for applications. A high-throughput light-directed assembly is demonstrated as a printing technology by introducing gold nanorods to induce thermal convection flows that move microparticles (diameter = 40 µm to several hundreds of micrometers) to specific light-guided locations, forming desired patterns...
May 8, 2017: Small
https://www.readbyqxmd.com/read/28471271/extracellular-matrix-hydrogel-derived-from-human-umbilical-cord-as-a-scaffold-for-neural-tissue-repair-and-its-comparison-with-extracellular-matrix-from-porcine-tissues
#12
Zuzana Kočí, Karel Výborný, Jana Dubišová, Irena Vacková, Aleš Jäger, Oleg Lunov, Klára Jiráková, Šárka Kubinová
Extracellular matrix (ECM) hydrogels prepared by tissue decellularization have been reported as natural injectable materials suitable for neural tissue repair. In this study, we prepared ECM hydrogel derived from human umbilical cord (UC) and evaluated its composition and mechanical and biological properties in comparison with the previously described ECM hydrogels derived from porcine urinary bladder (UB), brain, and spinal cord. The ECM hydrogels did not differ from each other in the concentration of collagen, while the highest content of glycosaminoglycans as well as the shortest gelation time was found for UC-ECM...
May 25, 2017: Tissue Engineering. Part C, Methods
https://www.readbyqxmd.com/read/28463545/meniscal-tissue-engineering-using-aligned-collagen-fibrous-scaffolds-comparison-of-different-human-cell-sources
#13
Jihye Baek, Sujata Sovani, Wonchul Choi, Sungho Jin, Shawn P Grogan, Darryl D'Lima
Hydrogel and electrospun scaffold materials support cell attachment and neotissue development and can be tuned to structurally and mechanically resemble native ECM by altering either electrospun fiber or hydrogel properties. In this study, we examined meniscus tissue generation from different human cell sources including meniscus cells derived from vascular and avascular regions, bone marrow-derived mesenchymal stem cells (hMSC), synovial cells, and cells from the infrapatellar fat pad (IPFP). All cells were seeded onto aligned electrospun collagen type I scaffolds and were optionally encapsulated in a tricomponent hydrogel...
May 2, 2017: Tissue Engineering. Part A
https://www.readbyqxmd.com/read/28457199/bone-regeneration-mediated-by-a-bioactive-and-biodegradable-ecm-like-hydrogel-based-on-elastin-like-recombinamers
#14
Dante J Coletta, Arturo Ibáñez-Fonseca, Liliana R Missana, María V Jammal, Ezequiel J Vitelli, Mariangeles Aimone, Facundo Zabalza, João Paulo Mardegan Issa, Matilde Alonso, José Carlos Rodríguez-Cabello, Sara Feldman
The morbidity of bone fractures and defects is steadily increasing due to changes in the age pyramid. As such, novel biomaterials that are able to promote the healing and regeneration of injured bones are needed in order to overcome the limitations of auto-, allo-, and xenografts, while providing a ready-to-use product that may help to minimize surgical invasiveness and duration. In this regard, recombinant biomaterials, such as elastin-like recombinamers (ELRs), are very promising as their design can be tailored by genetic engineering, thus allowing scalable production and batch-to-batch consistency, amongst others...
April 29, 2017: Tissue Engineering. Part A
https://www.readbyqxmd.com/read/28457187/laser-etched-designs-for-molding-hydrogel-based-engineered-tissues
#15
Fabiola Munarin, Nicholas J Kaiser, Tae Yun Kim, Bum-Rak Choi, Kareen L K Coulombe
Rapid prototyping and fabrication of elastomeric molds for sterile culture of engineered tissues allow for the development of tissue geometries that can be tailored to different in vitro applications and customized as implantable scaffolds for regenerative medicine. Commercially available molds offer minimal capabilities for adaptation to unique conditions or applications versus those for which they are specifically designed. Here we describe a replica molding method for the design and fabrication of poly(dimethylsiloxane) (PDMS) molds from laser-etched acrylic negative masters with ∼0...
May 2017: Tissue Engineering. Part C, Methods
https://www.readbyqxmd.com/read/28441501/hooked-on-cryogels-a-carbamate-linker-based-depot-for-slow-drug-release
#16
Duygu Aydin, Mehmet Arslan, Amitav Sanyal, Rana Sanyal
Poly(ethylene glycol) (PEG) based bulk hydrogels and cryogels containing activated carbonate groups as amine reactive handles to facilitate drug conjugations through carbamate linkages were fabricated and evaluated as slow releasing drug reservoirs. As an initial approach, photopolymerization of N-hydroxysuccinimide (NHS)-activated carbonate functional group containing monomer and PEG-methacrylate in the presence of a cross-linker was utilized to obtain bulk hydrogels with high gel conversions. The resultant hydrogels possessed moderate water uptake (170-340%) which was dependent on the monomer ratios...
May 5, 2017: Bioconjugate Chemistry
https://www.readbyqxmd.com/read/28416308/implantation-of-endothelial-cells-with-mesenchymal-stem-cells-accelerates-dental-pulp-tissue-regeneration-healing-in-pulpotomized-rat-molars
#17
Yukiko Sueyama, Tomoatsu Kaneko, Takafumi Ito, Reika Kaneko, Takashi Okiji
INTRODUCTION: This study aimed to examine whether the implantation of mesenchymal stem cells (MSCs) with endothelial cells (ECs) accelerates pulp tissue regeneration/healing and induces dentin bridge formation in a rat model of molar coronal pulp regeneration. METHODS: The maxillary first molars of Wistar rats were subjected to pulpotomy. Then, pulp chambers were implanted with biodegradable hydrogel-made scaffolds carrying MSCs together or without dermal microvascular ECs, and the cavities were sealed with mineral trioxide aggregate...
April 14, 2017: Journal of Endodontics
https://www.readbyqxmd.com/read/28412794/-effects-of-alginate-collagen-scaffold-on-cell-proliferation-and-differentiation-of-human-adipose-derived-mesenchymal-stem-cells
#18
W Cheng, X P Han, S L Mou, F Yang, L P Liu
Objective: To build scaffold materials with different concentrations of alginate and collagen, and to observe the effects of alginate/collagen ratio on the proliferation of human adipose-derived mesenchymal stem cells (hAMSC) and osteogenic differentiation. The optimal concentration of alginate/collagen will be chosen for constructing hydrogel that will be used for bone tissue engineering. Methods: Soluble hydrogel scaffold materials containing alginate/collagen were prepared, and the following groups were established based on different alginate/collagen ratio: 4∶1 (group A), 2∶1 (group B), and 1∶1 (group C)...
April 9, 2017: Zhonghua Kou Qiang Yi Xue za Zhi, Zhonghua Kouqiang Yixue Zazhi, Chinese Journal of Stomatology
https://www.readbyqxmd.com/read/28385446/dental-and-orofacial-mesenchymal-stem-cells-in-craniofacial-regeneration-the-prosthodontist-s-point-of-view
#19
REVIEW
Sahar Ansari, Jackson T Seagroves, Chider Chen, Kumar Shah, Tara Aghaloo, Benjamin M Wu, Sompop Bencharit, Alireza Moshaverinia
Of the available regenerative treatment options, craniofacial tissue regeneration using mesenchymal stem cells (MSCs) shows promise. The ability of stem cells to produce multiple specialized cell types along with their extensive distribution in many adult tissues have made them an attractive target for applications in tissue engineering. MSCs reside in a wide spectrum of postnatal tissue types and have been successfully isolated from orofacial tissues. These dental- or orofacial-derived MSCs possess self-renewal and multilineage differentiation capacities...
April 3, 2017: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/28376257/the-stiffness-of-a-crosslinked-hyaluronan-hydrogel-affects-its-chondro-induction-activity-on-hadscs
#20
Benjamin Teong, Shun-Cheng Wu, Chien-Mei Chang, Jhen-Wei Chen, Hui-Ting Chen, Chung-Hwan Chen, Je-Ken Chang, Mei-Ling Ho
Matrix stiffness plays an important role in stem cell differentiation. This study reports the synthesis of methacrylated hyaluronan (MeHA) with different degrees of methacrylation, ranging from 15 to 140% per disaccharide unit, which corresponds to a matrix stiffness ranging from 1.5 to 8 KPa. The swelling ratio was inversely proportional to the matrix stiffness, but the water content remained constant at >97% of the hydrogel mass. A fibril-like surface morphology and larger pore size were observed in lyophilized MeHA hydrogel with a lower stiffness...
April 4, 2017: Journal of Biomedical Materials Research. Part B, Applied Biomaterials
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