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Biodegradable scaffold

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https://www.readbyqxmd.com/read/29457598/in-vivo-biocompatibility-and-degradation-of-novel-polycaprolactone-biphasic-calcium-phosphate-scaffolds-used-as-a-bone-substitute
#1
Nuttawut Thuaksuban, Rungrot Pannak, Pleumjit Boonyaphiphat, Naruporn Monmaturapoj
BACKGROUND: Biocompatibility and degradation of poly ε-caprolactone (PCL)-Biphasic Calcium Phosphate (BCP) scaffolds fabricated by the "Melt Stretching and Compression Molding (MSCM)" technique were evaluated in rat models. OBJECTIVES: Degradation behaviors and histological biocompatibility of the PCL-20% BCP MSCM scaffolds and compare with those of PCL-20% β-tricalcium phosphate (TCP) scaffolds commercially fabricated by Fused Deposition Modeling (FDM) were evaluated...
2018: Bio-medical Materials and Engineering
https://www.readbyqxmd.com/read/29456009/novel-in-situ-forming-hydrogel-based-on-xanthan-and-chitosan-re-gelifying-in-liquids-for-local-drug-delivery
#2
Jinjian Huang, Youming Deng, Jianan Ren, Guopu Chen, Gefei Wang, Feng Wang, Xiuwen Wu
Injectable hydrogels have been an attractive topic in biomaterials. However, during gelation in vivo, they are easy to disperse due to tissue exudates, thus leading to failure of controlled drug release. To solve this problem, we present a novel polysaccharide-based injectable hydrogel via self-crosslinking of aldehyde-modified xanthan (Xan-CHO) and carboxymethyl-modified chitosan (NOCC). The physical properties were optimized by adjusting the mass ratio of Xan-CHO and NOCC. Experiments revealed that this material exhibited the characteristics of self-healing, anti-enzymatic hydrolysis, biocompatibility and biodegradability...
April 15, 2018: Carbohydrate Polymers
https://www.readbyqxmd.com/read/29451714/development-of-regenerative-and-flexible-fibroin-based-wound-dressings
#3
Angelica Panico, Federica Paladini, Mauro Pollini
Skin injuries represent a health problem with consequences in terms of morbidity, disability and life quality. Numerous strategies have been developed for the treatment of wounds, including skin substitutes, biomembranes, scaffolds, and smart dressings. The excellent properties of fibroin can be exploited for the development of advanced wound dressing biomaterials, aiming at promoting the wound healing process. In this work, silk fibroin films modified through the addition of glucose were developed to enhance flexibility of medical device without affecting the biocompatibility, to promote wound healing and to improve the patient well-being...
February 16, 2018: Journal of Biomedical Materials Research. Part B, Applied Biomaterials
https://www.readbyqxmd.com/read/29451384/a-highly-elastic-biodegradable-single-network-hydrogel-for-cell-printing
#4
Cancan Xu, Wenhan Lee, Guohao Dai, Yi Hong
Cell printing is becoming a common technique to fabricate cellularized printed-scaffold for biomedical application. There are still significant challenges in soft tissue bioprinting using hydrogels which requires live cells inside the hydrogels. Moreover, the resilient mechanical properties from hydrogels are also required to mechanically mimic the native soft tissues. Herein, we developed a visible-light crosslinked, single-network, biodegradable hydrogel with high elasticity and flexibility for cell printing, which is different from previous highly elastic hydrogel with double-network and two-components...
February 16, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29442910/antibacterial-performance-of-pcl-chitosan-core-shell-scaffolds
#5
Ozan Ozkan, Hilal Turkoglu Sasmazel
In this study, antibacterial performance of the coaxially electrospun Poly-ε-caprolactone (PCL)-chitosan core-shell scaffolds developed, optimized and identified physically and chemically in our previous study, were evaluated for the suitability in wound healing applications. The aim of utilizing a core-shell fibrous scaffold with PCL as core and chitosan as shell was to combine natural biocompatibility, biodegradability and antibacterial properties of chitosan with mechanical properties and resistance to enzymatic degradation of PCL...
April 1, 2018: Journal of Nanoscience and Nanotechnology
https://www.readbyqxmd.com/read/29438752/design-and-evaluation-of-chitosan-poly-l-lactide-pectin-based-composite-scaffolds-for-cartilage-tissue-regeneration
#6
Sarada Prasanna Mallick, Bhisham Narayan Singh, Amit Rastogi, Pradeep Srivastava
Poor regenerative potential of cartilage tissue due to the avascular nature and lack of supplementation of reparative cells impose an important challenge in recent medical practice towards development of artificial extracellular matrix with enhanced neo-cartilage tissue regeneration potential. Chitosan (CH), poly (l-lactide) (PLLA), and pectin (PC) compositions were tailored to generate polyelectrolyte complex based porous scaffolds using freeze drying method and crosslinked by 1-ethyl-3-(3-dimethylaminopropyl) carbodiimide (EDC), N-hydroxysuccinimide (NHS) solution containing chondroitin sulfate (CS) to mimic the composition as well as architecture of the cartilage extracellular matrix (ECM)...
February 10, 2018: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/29431029/oversized-biodegradable-arterial-grafts-promote-enhanced-neointimal-tissue-formation
#7
Cameron A Best, Takuma Fukunishi, Joseph Drews, Ramak Khosravi, Kan Hor, Nathan Mahler, Tai Yi, Jay D Humphrey, Jed Johnson, Christopher K Breuer, Narutoshi Hibino
Most tissue-engineered arterial grafts are complicated by aneurysmal dilation secondary to insufficient neotissue formation after scaffold degradation. The optimal graft would form an organized multi-layered structure with a robust extracellular matrix that could withstand arterial pressure. The purpose of the current study was to determine how oversizing a biodegradable arterial scaffold affects long-term neotissue formation. Size-matched (1.0 mm, n=11) and oversized (1.6 mm, n=9) electrospun polycaprolactone/chitosan scaffolds were implanted as abdominal aortic interposition grafts in Lewis rats...
February 12, 2018: Tissue Engineering. Part A
https://www.readbyqxmd.com/read/29420310/generation-of-genipin-cross-linked-fibrin-agarose-hydrogel-tissue-like-models-for-tissue-engineering-applications
#8
Fernando Campos, Ana B Bonhome-Espinosa, Gerson Vizcaino, Ismael A Rodriguez, Daniel Duran-Herrera, Modesto T López-López, Indalecio Sánchez-Montesinos, Miguel Alaminos, María C Sánchez-Quevedo, Víctor Carriel
The generation of biomimetic and biocompatible artificial tissues is the basic research objective for tissue engineering (TE). In this sense, the biofabrication of scaffolds that resemble the tissues' extracellular matrix is an essential aim in this field. Uncompressed and nanostructured fibrin-agarose hydrogels (FAH and NFAH, respectively) have emerged as promising scaffolds in TE, but their structure and biomechanical properties must be improved in order to broaden their TE applications. Here, we generated and characterized novel membrane-like models with increased structural and biomechanical properties based on the chemical cross-linking of FAH and NFAH with genipin (GP at 0...
February 8, 2018: Biomedical Materials
https://www.readbyqxmd.com/read/29419813/biodegradable-and-biocompatible-polyhydroxy-alkanoates-pha-auspicious-microbial-macromolecules-for-pharmaceutical-and-therapeutic-applications
#9
REVIEW
Martin Koller
Polyhydroxyalkanoates (PHA) are bio-based microbial biopolyesters; their stiffness, elasticity, crystallinity and degradability are tunable by the monomeric composition, selection of microbial production strain, substrates, process parameters during production, and post-synthetic processing; they display biological alternatives for diverse technomers of petrochemical origin. This, together with the fact that their monomeric and oligomeric in vivo degradation products do not exert any toxic or elsewhere negative effect to living cells or tissue of humans or animals, makes them highly stimulating for various applications in the medical field...
February 8, 2018: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/29412500/gelatin-genipin-based-biomaterials-for-skeletal-muscle-tissue-engineering
#10
Francesca Gattazzo, Carmelo De Maria, Alessandro Rimessi, Silvia Donà, Paola Braghetta, Paolo Pinton, Giovanni Vozzi, Paolo Bonaldo
Skeletal muscle engineering aims at tissue reconstruction to replace muscle loss following traumatic injury or in congenital muscle defects. Skeletal muscle can be engineered by using biodegradable and biocompatible scaffolds that favor myogenic cell adhesion and subsequent tissue organization. In this study, we characterized scaffolds made of gelatin cross-linked with genipin, a natural derived cross-linking agent with low cytotoxicity and high biocompatibility, for tissue engineering of skeletal muscle. We generated gelatin-genipin hydrogels with a stiffness of 13 kPa to reproduce the mechanical properties characteristic of skeletal muscle and we show that their surface can be topographically patterned through soft lithography to drive myogenic cells differentiation and unidirectional orientation...
February 7, 2018: Journal of Biomedical Materials Research. Part B, Applied Biomaterials
https://www.readbyqxmd.com/read/29410803/development-of-bioabsorbable-polylactide-membrane-with-controllable-hydrophilicity-for-adjustment-of-cell-behaviours
#11
Yang Yang, Xiaofeng Qiu, Yi Sun, Yifeng Wang, Jine Wang, Yulin Li, Changsheng Liu
Cell functions can be mediated through their interactions with the microenvironments, which highly depend on the surface state of the substrate. However, how to finely adjust the surface of biomaterials is still very challenging. In this study, poly(d,l-lactide) (PDLLA) with high molecular weight was synthesized via ring opening polymerization, which was hot-pressed into PDLLA membrane. In order to modify the hydrophobicity of the membrane (a limiting factor for its biomedical application), an amphiphilic monomethoxyl poly(ethylene glycol)-b-poly(d,l-lactide) (PEG-PDLLA) was selected to improve its surface hydrophilicity through a simple self-assembly approach...
January 2018: Royal Society Open Science
https://www.readbyqxmd.com/read/29396297/in-vitro-regeneration-of-patient-specific-ear-shaped-cartilage-and-its-first-clinical-application-for-auricular-reconstruction
#12
Guangdong Zhou, Haiyue Jiang, Zongqi Yin, Yu Liu, Qingguo Zhang, Chen Zhang, Bo Pan, Jiayu Zhou, Xu Zhou, Hengyun Sun, Dan Li, Aijuan He, Zhiyong Zhang, Wenjie Zhang, Wei Liu, Yilin Cao
Microtia is a congenital external ear malformation that can seriously influence the psychological and physiological well-being of affected children. The successful regeneration of human ear-shaped cartilage using a tissue engineering approach in a nude mouse represents a promising approach for auricular reconstruction. However, owing to technical issues in cell source, shape control, mechanical strength, biosafety, and long-term stability of the regenerated cartilage, human tissue engineered ear-shaped cartilage is yet to be applied clinically...
January 13, 2018: EBioMedicine
https://www.readbyqxmd.com/read/29387506/electrospun-aniline-tetramer-co-polycaprolactone-fibres-for-conductive-biodegradable-scaffolds
#13
A G Guex, C D Spicer, A Armgarth, A Gelmi, E J Humphrey, C M Terracciano, S Harding, M M Stevens
Conjugated polymers have been proposed as promising materials for scaffolds in tissue engineering applications. The restricted processability and biodegradability of conjugated polymers limit their use for biomedical applications however. Here we synthesised a block-co-polymer of aniline tetramer and PCL (AT-PCL), and processed it into fibrous non-woven scaffolds by electrospinning. We showed that fibronectin (Fn) adhesion was dependant on the AT-PCL oxidative state, with a reduced Fn unfolding length on doped membranes...
September 2017: MRS Communications
https://www.readbyqxmd.com/read/29386409/enhancement-of-wound-healing-efficiency-mediated-by-artificial-dermis-functionalized-with-egf-or-nrg1
#14
Dogeon Yoon, Dajeong Yoon, Hyuk-Jin Cha, Ji-Seon Lee, Wook Chun
The use of artificial dermis as a skin substitute represents a field of active study, as acellular dermal matrices from cadavers are susceptible to infection owing to their human origin. One such alternative dermal replacement scaffold, INSUREGRAF®, is derived primarily from extracellular matrix proteins such as collagen and elastin and has been clinically used to treat severe skin wounds such as burns. This scaffold has proven to be useful to minimize wound contraction and scar formation owing to its biocompatibility, interconnected pore structure, sufficient biodegradability, and suitable mechanical properties...
February 1, 2018: Biomedical Materials
https://www.readbyqxmd.com/read/29381284/3d-poly-lactic-co-glycolic-acid-scaffolds-for-treating-spinal-cord-injury
#15
Fangfang Sun, Tingchun Shi, Tao Zhou, Dongwei Dong, Jin Xie, Ruiyan Wang, Xiao An, Meihua Chen, Jianhui Cai
In this paper, poly(lactic-co-glycolic acid) (PLGA) was used to fabricate spinal cord scaffolds using low temperature deposition manufacturing (LDM) technology. The PLGA scaffolds were characterized as having good porosity, hydrophilicity and considerable biodegradability. The effects of the PLGA scaffolds on cell proliferation and cytotoxicity were evaluated by culturing Schwann cells (SCs) on the surfaces of the scaffolds. The results showed that the SCs spread and proliferated well on the PLGA scaffolds...
March 2017: Journal of Biomedical Nanotechnology
https://www.readbyqxmd.com/read/29379910/nanocomposite-injectable-gels-capable-of-self-replenishing-regenerative-extracellular-microenvironments-for-in-vivo-tissue-engineering
#16
Koji Nagahama, Naho Oyama, Kimika Ono, Atsushi Hotta, Keiko Kawauchi, Takahito Nishikata
Injectable hydrogels are biomaterials that have the potential to provide scaffolds to cells for in situ tissue regeneration with a minimally invasive implantation procedure. The success of in vivo tissue engineering utilizing injectable gels depends on providing cells with appropriate scaffolds that present an instructive extracellular microenvironment, which strongly influences the survival, proliferation, organization, and function of cells encapsulated within gels. One of the most important abilities of injectable gels to achieve this function is to adsorb and retain a wide variety of requisite bioactive molecules including nutrients, extracellular matrices, and growth/differentiation factors within gels...
January 30, 2018: Biomaterials Science
https://www.readbyqxmd.com/read/29378326/interplay-between-stiffness-and-degradation-of-architectured-gelatin-hydrogels-leads-to-differential-modulation-of-chondrogenesis-in-vitro-and-in-vivo
#17
Melika Sarem, Neha Arya, Miriam Heizmann, Axel T Neffe, Andrea Barbero, Tim P Gebauer, Ivan Martin, Andreas Lendlein, V Prasad Shastri
The limited capacity of cartilage to heal large lesions through endogenous mechanisms has led to extensive effort to develop materials to facilitate chondrogenesis. Although physical-chemical properties of biomaterials have been shown to impactin vitro chondrogenesis, whether these findings are translatable in vivo is subject of debate. Herein, architectured 3D hydrogel scaffolds (ArcGel) (produced by crosslinking gelatin with ethyl lysine diisocyanate (LDI)) were used as a model system to investigate the interplay between scaffold mechanical properties and degradation on matrix deposition by human articular chondrocytes (HAC) from healthy donorsin vitroandin vivo...
January 26, 2018: Acta Biomaterialia
https://www.readbyqxmd.com/read/29377555/optimization-of-cell-growth-on-palmitoyl-hyaluronan-knitted-scaffolds-developed-for-tissue-engineering-applications
#18
Jana Sogorkova, Vojtech Zapotocky, Martin Cepa, Veronika Stepankova, Hana Vagnerova, Jana Batova, Martina Pospisilova, Jiri Betak, Kristina Nesporova, Martina Hermannova, Dorothée Daro, Garry Duffy, Vladimir Velebny
Polysaccharides meet several criteria for a suitable biomaterial for tissue engineering, which include biocompatibility and ability to support the delivery and growth of cells. Nevertheless, most of these polysaccharides, e.g. dextran, alginate, and glycosaminoglycans, are highly soluble in aqueous solutions. Hyaluronic acid hydrophobized by palmitic acid and processed to the form of wet-spun fibers and the warp-knitted textile scaffold is water non-soluble, but biodegradable material, which could be used for the tissue engineering purpose...
January 29, 2018: Journal of Biomedical Materials Research. Part A
https://www.readbyqxmd.com/read/29363828/oriented-nanofibrous-polymer-scaffolds-containing-protein-loaded-porous-silicon-generated-by-spray-nebulization
#19
Jonathan M Zuidema, Tushar Kumeria, Dokyoung Kim, Jinyoung Kang, Joanna Wang, Geoffrey Hollett, Xuan Zhang, David S Roberts, Nicole Chan, Cari Dowling, Elena Blanco-Suarez, Nicola J Allen, Mark H Tuszynski, Michael J Sailor
Oriented composite nanofibers consisting of porous silicon nanoparticles (pSiNPs) embedded in a polycaprolactone or poly(lactide-co-glycolide) matrix are prepared by spray nebulization from chloroform solutions using an airbrush. The nanofibers can be oriented by an appropriate positioning of the airbrush nozzle, and they can direct growth of neurites from rat dorsal root ganglion neurons. When loaded with the model protein lysozyme, the pSiNPs allow the generation of nanofiber scaffolds that carry and deliver the protein under physiologic conditions (phosphate-buffered saline (PBS), at 37 °C) for up to 60 d, retaining 75% of the enzymatic activity over this time period...
January 24, 2018: Advanced Materials
https://www.readbyqxmd.com/read/29362293/self-neutralizing-plga-magnesium-composites-as-novel-biomaterials-for-tissue-engineering
#20
Thomas O Xu, Hyun Sung Kim, Tyler Stahl, Syam Prasad Nukavarapu
Controlling acidic degradation of biodegradable polyesters remains a major challenge when used them as biomaterials in biomedical devices. This work presents a simple strategy of developing polyester composites with biodegradable magnesium metal or alloys. PLGA films with compositions of 1, 3, 5, and 10 wt% Mg were simply produced using the solvent-casting method, which resulted in composite films with near uniform Mg metal/alloy particle dispersion. Degradation study of the composite films showed that all compositions higher than 1 wt% Mg were able to extend the duration of degradation, and buffer acidic pH resulting from PLGA degradation...
January 24, 2018: Biomedical Materials
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