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Biodegradable scaffold

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https://www.readbyqxmd.com/read/28089930/scaffolds-containing-chitosan-gelatin-and-graphene-oxide-for-bone-tissue-regeneration-in-vitro-and-in-vivo
#1
S Saravanan, Anjali C, M Vairamani, T P Sastry, K S Subramanian, N Selvamurugan
Critical-sized bone defects are augmented with cell free and cell loaded constructs to bridge bone defects. Improving the properties of three-dimensional scaffolds with multiple polymers and others is of growing interest in recent decades. Chitosan (CS), a natural biopolymer has limitations for its use in bone regeneration, and its properties can be enhanced with other materials. In the present study, the composite scaffolds containing CS, gelatin (Gn) and graphene oxide (GO) were fabricated through freeze-drying...
January 12, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28069498/poly-glycerol-sebacate-poly-%C3%AE%C2%B5-caprolactone-blend-nanofibrous-scaffold-as-intrinsic-bio-and-immunocompatible-system-for-corneal-repair
#2
Sahar Salehi, Marta Czugala, Piotr Stafiej, Mohammadhossein Fathi, Thomas Bahners, Jochen S Gutmann, Bernhard B Singer, Thomas A Fuchsluger
: A major challenge in corneal tissue engineering and lamellar corneal transplantation is to develop synthetic scaffolds able to simulate the optical and mechanical properties of the native cornea. As a carrier, the graft scaffolds should provide the basis for anchorage, repair and regeneration. Although quite a number of scaffolds have been engineered to date, they have not been able to simultaneously recapitulate chemical, mechanical, and structural properties of the corneal extracellular matrix (ECM)...
January 6, 2017: Acta Biomaterialia
https://www.readbyqxmd.com/read/28069495/surface-modification-of-copolymerized-films-from-three-armed-biodegradable-macromers-an-analytical-platform-for-modified-tissue-engineering-scaffolds
#3
Benno M Müller, Rudi Loth, Peter-Georg Hoffmeister, Friederike Zühl, Liv Kalbitzer, Michael C Hacker, Michaela Schulz-Siegmund
: The concept of macromers allows for a broad adjustment of biomaterial properties by macromer chemistry or copolymerization. Copolymerization strategies can also be used to introduce reactive sites for subsequent surface modification. Control over surface features enables adjustment of cellular reactions with regard to site and object of implantation. We designed macromer-derived polymer films which function as non-implantable analytical substrates for the investigation of surface properties of equally composed scaffolds for bone tissue engineering...
January 6, 2017: Acta Biomaterialia
https://www.readbyqxmd.com/read/28064056/preparation-and-characterization-of-novel-functionalized-multiwalled-carbon-nanotubes-chitosan-%C3%AE-glycerophosphate-scaffolds-for-bone-tissue-engineering
#4
Shayan Gholizadeh, Fathollah Moztarzadeh, Nooshin Haghighipour, Leila Ghazizadeh, Fatemeh Baghbani, Mohammad Ali Shokrgozar, Zahra Allahyari
A major limitation in current tissue engineering scaffolds is that some of the most important characteristics of the intended tissue are ignored. As piezoelectricity and high mechanical strength are two of the most important characteristics of the bone tissue, carbon nanotubes are getting a lot of attention as a bone tissue scaffold component in recent years. In the present study, composite scaffolds comprised of functionalized Multiwalled Carbon Nanotubes (f-MWCNT), medium molecular weight chitosan and β-Glycerophosphate were fabricated and characterized...
January 4, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28057509/promoting-bioengineered-tooth-innervation-using-nanostructured-and-hybrid-scaffolds
#5
S Kuchler-Bopp, A Larrea, L Petry, Y Idoux-Gillet, V Sebastian, A Ferrandon, P Schwinté, M Arruebo, N Benkirane-Jessel
: The innervation of teeth mediated by axons originating from the trigeminal ganglia is essential for their function and protection. Immunosuppressive therapy using Cyclosporine A (CsA) was found to accelerate the innervation of transplanted tissues and particularly that of bioengineered teeth. To avoid the CsA side effects, we report in this study the preparation of CsA loaded poly(lactic-co-glycolic acid) (PLGA) nanoparticles, their embedding on polycaprolactone (PCL)-based scaffolds and their possible use as templates for the innervation of bioengineered teeth...
January 2, 2017: Acta Biomaterialia
https://www.readbyqxmd.com/read/28052577/a-novel-system-for-expansion-and-delivery-of-human-keratinocytes-for-the-treatment-of-severe-cutaneous-injuries-using-microcarriers-and-compressed-collagen
#6
Y H Martin, K Jubin, S Smalley, J P F Wong, R A Brown, A D Metcalfe
Cell therapy with autologous or allogeneic keratinocytes applied as a single-cell suspension is well established in clinical practice in the treatment of severe burn injuries to augment epithelial barrier restoration. Yet, the application of cell sprays can lead to significant cell loss owing to lack of adhesion of cell suspension to the wound bed. The development of a robust and controllable method of transplanting cells onto the wound bed is yet to be established. The ability to control adhesion and distribution of cells by using a cell carrier embedded in a biodegradable scaffold could significantly improve the treatment of cutaneous wounds with keratinocyte cell therapy...
January 4, 2017: Journal of Tissue Engineering and Regenerative Medicine
https://www.readbyqxmd.com/read/28050608/an-in-situ-poly-carboxybetaine-hydrogel-for-tissue-engineering-applications
#7
Hsiu-Wen Chien, Jiashing Yu, Shing Tak Li, Hsin-Yu Chen, Wei-Bor Tsai
Hydrogels provide three-dimensional (3D) frames with tissue-like elasticity and high water content for tissue scaffolds. Previously, we reported the design and synthesis protocol of a biodegradable poly(carboxybetaine) poly(CB) hydrogel with a zwitterionic carboxybetaine methacrylate (CBMA) monomer and a disulfide-containing crosslinker via free radical polymerization. We also demonstrated that cells could be successfully encapsulated in the hydrogels without compromising cytoviability. In this study, we evaluated the cytoviability of three commonly used zwitterionic monomers (CBMA, 2-methacryloyloxyethyl phosphorylcholine (MPC) and sulfobetaine methacrylate (SBMA)) and the suitability of being utilized as precursor materials for in situ gel forming implants...
January 4, 2017: Biomaterials Science
https://www.readbyqxmd.com/read/28036169/low-initial-modulus-biodegradable-polyurethane-elastomers-for-soft-tissue-regeneration
#8
Cancan Xu, Yihui Huang, Liping Tang, Yi Hong
The mechanical match between synthetic scaffold and host tissue remains challenging in tissue regeneration. The elastic soft tissues exhibit low initial moduli with a J-shaped tensile curve. The suitable synthetic polymer scaffolds requires low initial modulus and elasticity. To achieve these requirements, random copolymers poly(δ-valerolactone-co-ε-caprolactone) (PVCL) and hydrophilic poly(ethylene glycol) (PEG) were combined into a triblock copolymer PVCL-PEG-PVCL, which was used as a soft segment to synthesize a family of biodegradable elastomeric polyurethanes with low initial moduli...
December 30, 2016: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28028517/preparation-and-characterization-of-poly-hydroxy-butyrate-chitosan-blend-scaffolds-for-tissue-engineering-applications
#9
Saeed Karbasi, Saied Nouri Khorasani, Somayeh Ebrahimi, Shahla Khalili, Farnoosh Fekrat, Davoud Sadeghi
BACKGROUND: Poly (hydroxy butyrate) (PHB) is a biodegradable and biocompatible polymer with good mechanical properties. This polymer could be a promising material for scaffolds if some features improve. MATERIALS AND METHODS: In the present work, new PHB/chitosan blend scaffolds were prepared as a three-dimensional substrate in cartilage tissue engineering. Chitosan in different weight percent was added to PHB and solved in trifluoroacetic acid. Statistical Taguchi method was employed in the design of experiments...
2016: Advanced Biomedical Research
https://www.readbyqxmd.com/read/28024631/gold-nanoparticle-filled-biodegradable-photopolymer-scaffolds-induced-muscle-remodeling-in-vitro-and-in-vivo-findings
#10
Adam Zsedenyi, Balazs Farkas, Gaser N Abdelrasoul, Ilaria Romano, Edina Gyukity-Sebestyen, Katalin Nagy, Maria Harmati, Gabriella Dobra, Sandor Kormondi, Gabor Decsi, Istvan Balazs Nemeth, Alberto Diaspro, Fernando Brandi, Szabolcs Beke, Krisztina Buzas
Therapeutic stem cell transplantation bears the promise of new directions in organ and tissue replacement, but a number of its difficulties and perils are also well known. Our goal was to develop a method of transplantation by which the transplanted cells remain confined to the transplantation site and induce favorable processes. With the help of mask-projection excimer laser stereolithography, 3D hybrid nanoscaffolds were fabricated from biodegradable, photocurable PPF:DEF resin with incorporated gold nanoparticles (Au NPs)...
March 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28024594/an-injectable-poly-caprolactone-trifumarate-gelatin-microparticles-pcltf-gmps-scaffold-for-irregular-bone-defects-physical-and-mechanical-characteristics
#11
Nisreen Mohammed Al-Namnam, Muralithran Govindan Kutty, Wen Lin Chai, Kien Oon Ha, Kah Hwi Kim, Chong Huat Siar, Wei Cheong Ngeow
Recently, a modified form of a three-dimension (3D) porous poly(caprolactone-trifumarate) (PCLTF) scaffold has been produced using a fabrication technique that involves gelatin microparticles porogen leaching. This poly(caprolactone trifumarate-gelatin microparticles) (PCLTF-GMPs) scaffold has been shown to be biocompatible, more flowable clinically, and has a shorter degradation time as compared to its existing predecessors. In this report, a detailed characterization of this new scaffold was performed by testing its cytocompatibility, analyzing the surface topography, and understanding its thermal, physical and mechanical properties...
March 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28017598/biodegradable-poly-%C3%AE%C2%B5-caprolactone-microcarriers-for-efficient-production-of-human-mesenchymal-stromal-cells-and-secreted-cytokines-in-batch-and-fed-batch-bioreactors
#12
Alan Tin-Lun Lam, Jian Li, Jessica Pei-Wen Toh, Eileen Jia-Hui Sim, Allen Kuan-Liang Chen, Jerry Kok-Yen Chan, Mahesh Choolani, Shaul Reuveny, William R Birch, Steve Kah-Weng Oh
Large numbers of human mesenchymal stromal cells (MSCs) used for a variety of applications in tissue engineering and cell therapy can be generated by scalable expansion in a bioreactor using microcarriers (MCs) systems. However, the enzymatic digestion process needed to detach cells from the growth surface can affect cell viability and potentially the potency and differentiation efficiency. Thus, the main aim of our study was to develop biocompatible and biodegradable MCs that can support high MSC yields while maintaining their differentiation capability and potency...
December 22, 2016: Cytotherapy
https://www.readbyqxmd.com/read/28017585/evaluation-of-the-stromal-vascular-fraction-of-adipose-tissue%C3%A2-as-the-basis-for-a-stem-cell-based-tissue-engineered-vascular-graft
#13
Jeffrey T Krawiec, Han-Tsung Liao, LaiYee Lily Kwan, Antonio D'Amore, Justin S Weinbaum, J Peter Rubin, William R Wagner, David A Vorp
OBJECTIVE: One of the rate-limiting barriers within the field of vascular tissue engineering is the lengthy fabrication time associated with expanding appropriate cell types in culture. One particularly attractive cell type for this purpose is the adipose-derived mesenchymal stem cell (AD-MSC), which is abundant and easily harvested from liposuction procedures. Even this cell type has its drawbacks, however, including the required culture period for expansion, which could pose risks of cellular transformation or contamination...
December 22, 2016: Journal of Vascular Surgery
https://www.readbyqxmd.com/read/28017123/current-state-of-bioabsorbable-polymer-coated-drug-eluting-stents
#14
Akinapelli Absdhilash, Jack P Chen, Kristine Roy, Joseph Donnelly, Keith Dawkins, Barbara Huibregtse, Dongming Hou
Drug-eluting stents (DES) have been shown to significantly reduce clinical and angiographic restenosis compared to bare metal stents (BMS). The polymer coatings on DES elute antiproliferative drugs to inhibit intimal proliferation and prevent restenosis after stent implantation. Permanent polymers which do not degrade in vivo may increase the likelihood of stent-related delayed arterial healing or polymer hypersensitivity. In turn, these limitations may contribute to an increased risk of late clinical events...
December 22, 2016: Current Cardiology Reviews
https://www.readbyqxmd.com/read/28012032/abdominal-wall-reinforcement-biologic-vs-degradable-synthetic-devices
#15
S Gruber-Blum, J Brand, C Keibl, R H Fortelny, H Redl, F Mayer, A H Petter-Puchner
BACKGROUND: New biodegradable synthetic and biologic hernia implants have been promoted for rapid integration and tissue reinforcement in challenging repairs, e.g. at the hiatus or in contaminated wound fields. Interestingly, experimental data to support or falsify this assumption is scarce. METHODS: Synthetic (BioA(®)) and biologic implants (porcine and bovine collagen matrices Strattice(®) and Veritas(®)) have been tested in experimental onlay hernia repair in rats in observation periods of 30 and 60 days...
December 23, 2016: Hernia: the Journal of Hernias and Abdominal Wall Surgery
https://www.readbyqxmd.com/read/28011142/cell-matrix-mechanical-interaction-in-electrospun-polymeric-scaffolds-for-tissue-engineering-implications-for-scaffold-design-and-performance
#16
REVIEW
Kelsey M Kennedy, Archana Bhaw-Luximon, Dhanjay Jhurry
: Engineered scaffolds produced by electrospinning of biodegradable polymers offer a 3D, nanofibrous environment with controllable structural, chemical, and mechanical properties that mimic the extracellular matrix of native tissues and have shown promise for a number of tissue engineering applications. The microscale mechanical interactions between cells and electrospun matrices drive cell behaviors including migration and differentiation that are critical to promote tissue regeneration...
December 21, 2016: Acta Biomaterialia
https://www.readbyqxmd.com/read/28003887/histological-evaluation-of-hydroxyapatite-granules-with-and-without-platelet-rich-plasma-versus-an-autologous-bone-graft-comparative-study-of-biomaterials-used-for-spinal-fusion-in-a-new-zealand-white-rabbit-model
#17
Zamzuri Zakaria, Che N Z C Seman, Zunariah Buyong, Mohd A Sharifudin, Ahmad H Zulkifly, Kamarul A Khalid
OBJECTIVES: Hydroxyapatite (HA) has osteoconductive properties and is widely used as a bone graft substitute. Platelet-rich plasma (PRP) is an autologous product with osteoinductive effects. Hypothetically, a combination of both would augment the bone formation effect of HA and widen its application in spinal fusion surgeries. This study aimed to compare new bone formation with HA granules alone and in combination with PRP versus an autologous bone graft during a lumbar intertransverse process spinal fusion...
November 2016: Sultan Qaboos University Medical Journal
https://www.readbyqxmd.com/read/28003144/self-assembled-supramolecular-polymers-with-tailorable-properties-that-enhance-cell-attachment-and-proliferation
#18
Chih-Chia Cheng, Duu-Jong Lee, Jem-Kun Chen
: Self-assembled supramolecular scaffolds, a combination of noncovalent interactions within a biocompatible polymer substrate, can be used for efficient construction of highly-controlled self-organizing hierarchical structures; these newly-developed biomaterials exhibit excellent mechanical properties, tunable surface hydrophilicity, low cytotoxicity and high biodegradability, making them highly attractive for tissue engineering and regenerative medicine applications. Herein, we demonstrate a novel supramolecular poly(ε-caprolactone) (PCL) containing self-complementary sextuple hydrogen-bonded uracil-diamidopyridine (U-DPy) moieties, which undergoes spontaneous self-assembly to form supramolecular polymer networks...
December 18, 2016: Acta Biomaterialia
https://www.readbyqxmd.com/read/27995526/chitosan-based-matrices-prepared-by-gamma-irradiation-for-tissue-regeneration-structural-properties-vs-preparation-method
#19
REVIEW
Maria Helena Casimiro, Joana J H Lancastre, Alexandra P Rodrigues, Susana R Gomes, Gabriela Rodrigues, Luís M Ferreira
In the last decade, new generations of biopolymer-based materials have attracted attention, aiming its application as scaffolds for tissue engineering. These engineered three-dimensional scaffolds are designed to improve or replace damaged, missing, or otherwise compromised tissues or organs. Despite the number of promising methods that can be used to generate 3D cell-instructive matrices, the innovative nature of the present work relies on the application of ionizing radiation technology to form and modify surfaces and matrices with advantage over more conventional technologies (room temperature reaction, absence of harmful initiators or solvents, high penetration through the bulk materials, etc...
February 2017: Topics in Current Chemistry (Journal)
https://www.readbyqxmd.com/read/27990164/phase-i-ii-trial-of-autologous-bone-marrow-stem-cell-transplantation-with-a-three-dimensional-woven-fabric-scaffold-for-periodontitis
#20
Shunsuke Baba, Yoichi Yamada, Akira Komuro, Yoritaka Yotsui, Makoto Umeda, Kimishige Shimuzutani, Sayaka Nakamura
Regenerative medicine is emerging as a promising option, but the potential of autologous stem cells has not been investigated well in clinical settings of periodontal treatment. In this clinical study, we evaluated the safety and efficacy of a new regenerative therapy based on the surgical implantation of autologous mesenchymal stem cells (MSCs) with a biodegradable three-dimensional (3D) woven-fabric composite scaffold and platelet-rich plasma (PRP). Ten patients with periodontitis, who required a surgical procedure for intrabony defects, were enrolled in phase I/II trial...
2016: Stem Cells International
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