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https://www.readbyqxmd.com/read/29037892/hybrid-spheroids-incorporating-ecm-like-engineered-fragmented-fibers-potentiate-stem-cell-function-by-improved-cell-cell-and-cell-ecm-interactions
#1
Taufiq Ahmad, Jinkyu Lee, Young Min Shin, Hyeok Jun Shin, Sajeesh Kumar Madhurakat Perikamana, Sun Hwa Park, Sung Won Kim, Heungsoo Shin
Extracellular matrix (ECM) microenvironment is critical for the viability, stemness, and differentiation of stem cells. In this study, we developed hybrid-spheroids of human turbinate mesenchymal stem cells (hTMSCs) by using extracellular matrix (ECM) mimicking fragmented fibers (FFs) for improvement of the viability and functions of hTMSCs. We prepared FFs with average size of 68.26 µm by partial aminolysis of poly L-lactide (PLLA) fibrous sheet (FS), which was coated with polydopamine for improved cell adhesion...
October 13, 2017: Acta Biomaterialia
https://www.readbyqxmd.com/read/29037044/porous-pcl-plla-semi-ipns-as-superior-defect-specific-scaffolds-with-potential-for-cranial-bone-defect-repair
#2
Lindsay N Woodard, Kevin T Kmetz, Abigail A Roth, Vanessa M Page, Melissa A Grunlan
The treatment of irregular cranial bone defects is currently limited due to the graft resorption that can occur when an ill-fitting interface exists between an autograft and the surrounding tissue. A tissue engineering scaffold able to achieve defect-specific geometries could improve healing. This work reports a macroporous, shape memory polymer (SMP) scaffold composed of a semi-interpenetrating network (semi-IPN) of thermoplastic poly(L-lactic acid) (PLLA) within cross-linked poly(ε-caprolactone) diacrylate (PCL-DA) that is capable of conformal fit within a defect...
October 16, 2017: Biomacromolecules
https://www.readbyqxmd.com/read/29031416/zinc-silicate-mineral-coated-scaffold-improved-in-vitro-osteogenic-differentiation-of-equine-adipose-derived-mesenchymal-stem-cells
#3
Behnaz Bageshlooyafshar, Saeid Vakilian, Mousa Kehtari, Tarlan Eslami-Arshaghi, Farjad Rafeie, Rouhallah Ramezanifard, Reza Rahchamani, Abdollah Mohammadi-Sangcheshmeh, Yousef Mostafaloo, Ehsan Seyedjafari
In current study we aimed to coat the PLLA scaffold with zinc (Zn) silicate mineral nanoparticles. Then, using equine adipose-derived stem cells (ASCs) we intended to compare the osteogenic induction potency of Zn silicate mineral-coated PLLA scaffold with uncoated PLLA scaffold and tissue culture plastic (TCPS). Adipose tissues were collected from 3 horses, and isolation of ASCs was achieved by enzymatic digestion. PLLA scaffold was successfully prepared using a phase separation method and coated with Zn silicate mineral nanoparticles...
September 18, 2017: Research in Veterinary Science
https://www.readbyqxmd.com/read/29025656/dual-delivery-of-vegf-and-ngf-by-emulsion-electrospun-nanofibrous-scaffold-for-peripheral-nerve-regeneration
#4
Bin Xia, Yonggang Lv
Controlled delivery of multiple therapeutic agents can be considered an effective approach in nerve injury due to its multifunction. In this study, recombinant human vascular endothelial growth factor (VEGF) and recombinant human nerve growth factor (NGF) were loaded on the surface and in the core of emulsion electrospun poly (l-lactic acid) (PLLA) nanofibrous scaffold, respectively. The in vitro studies showed that VEGF and NGF had a sequential release pattern in which most of the VEFG was released in the first few days but the NGF could be continuously released for >1month...
January 1, 2018: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/29024376/evaluation-of-collagen-foam-poly-l-lactic-acid-nanofiber-mesh-and-decellularized-matrices-for-corneal-regeneration
#5
Bahar Aslan, Selcan Guler, Atakan Tevlek, Halil Murat Aydin
Corneal tissue engineering efforts to obtain corneal tissue matrices through various types of materials for the replacement of damaged tissues. In this study, three different corneal constructs were prepared and evaluated in terms of morphological, optical, and biological characteristics. Type-I collagen was used to obtain collagen foam scaffolds through dehydrothermal crosslinking, while poly(l-lactic acid) (PLLA) was used to produce both random and aligned oriented electrospun corneal constructs. Bovine corneas were decellularized as third matrix...
October 12, 2017: Journal of Biomedical Materials Research. Part B, Applied Biomaterials
https://www.readbyqxmd.com/read/29018836/one-step-fabrication-of-bone-morphogenetic-protein-2-gene-activated-porous-poly-l-lactide-scaffold-for-bone-induction
#6
Jingwen Xue, Hang Lin, Allison Bean, Ying Tang, Jian Tan, Rocky S Tuan, Bing Wang
Bone morphogenetic protein 2 (BMP2) is an efficacious inducer for the osteogenesis of mesenchymal stem cells (MSCs). Conventional applications of BMP2 have involved either the direct incorporation of BMP2 protein or ex vivo BMP2 gene transfer into stem cells prior to their transplantation. These approaches are able to promote bone formation to some extent; however, they are hampered by either the lack of stability and sustainability of BMP2 protein or the time-consuming and cost-prohibitive in vitro cell culture procedure...
December 15, 2017: Molecular Therapy. Methods & Clinical Development
https://www.readbyqxmd.com/read/28972138/photorhabdus-luminescens-lectin-a-plla-a-new-probe-for-detecting-%C3%AE-galactoside-terminating-glycoconjugates
#7
Ghamdan Beshr, Asfandyar Sikandar, Eva-Maria Jemiller, Nikolai Klymiuk, Dirk Hauck, Stefanie Wagner, Eckhard Wolf, Jesko Koehnke, Alexander Titz
Lectins play important roles in infections by pathogenic bacteria, for example, in host colonization, persistence and biofilm formation. The Gram-negative entomopathogenic bacterium Photorhabdus luminescens symbiotically lives in insect-infecting Heterorhabditis nematodes and kills the insect host upon invasion by the nematode. The P. luminescens genome harbors the gene plu2096 coding for a novel lectin that we named PllA. We analyzed the binding properties of purified PllA with a glycan array and a binding assay in solution...
September 28, 2017: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/28963019/an-epigenetic-bioactive-composite-scaffold-with-well-aligned-nanofibers-for-functional-tendon-tissue-engineering
#8
Can Zhang, Xianliu Wang, Erchen Zhang, Long Yang, Huihua Yuan, Wenjing Tu, Huilan Zhang, Zi Yin, Weiliang Shen, Xiao Chen, Yanzhong Zhang, Hongwei Ouyang
Poor tendon repair is often a clinical challenge due to the lack of ideal biomaterials. Electrospun aligned fibers, resembling the ultrastructure of tendon, have been previously reported to promote tenogenesis. However, the underlying mechanism is unclear and the aligned fibers alone are not capable enough to commit teno-differentiation of stem cells. Here, based on our observation of reduced expression of histone deacetylases (HDACs) in tendon stem/progenitor cells (TSPCs) cultured on aligned fibers, we proposed a strategy to enhance the tenogenesis effect of aligned fibers by using a small molecule Trichostatin A (TSA), an HDAC inhibitor...
September 26, 2017: Acta Biomaterialia
https://www.readbyqxmd.com/read/28951331/design-development-and-characterization-of-synthetic-bruch-s-membranes
#9
Denver C Surrao, Ursula Greferath, Yu-Qian Chau, Stuart J Skabo, Mario Huynh, Kinnari J Shelat, Ioannis J Limnios, Erica L Fletcher, Qin Liu
Age-related macular degeneration (AMD) is a leading cause of blindness, and dry AMD has no effective treatment. Retinal constructs comprising retinal pigment epithelium (RPE) cells supported by electrospun scaffolds have been investigated to treat dry AMD. However, electrospun scaffolds studied to-date do not mimic the structural microenvironment of human Bruch's membrane (BM), essential for native-like RPE monolayers. The aim of this study was to develop a structurally biomimetic scaffold designed to support a functional RPE monolayer, comprising porous, electrospun nanofibrous membranes (ENMs), coated with laminin, mimicking the inner collagenous layer (ICL) and basal RPE lamina respectively, the cell supporting layers of the BM...
September 23, 2017: Acta Biomaterialia
https://www.readbyqxmd.com/read/28942460/hip-arthroscopy-enables-classification-and-treatment-of-precollapse-subchondral-insufficiency-fracture-of-the-femoral-head-associated-intra-articular-pathology
#10
Soshi Uchida, Moriyuki Noguchi, Hajime Utsunomiya, Shiho Kanezaki, Toshiharu Mori, Dean K Matsuda, Akinori Sakai
PURPOSE: The purposes of this study were to investigate (1) the clinical, radiographic and arthroscopic presentation of patients with subchondral insufficiency fracture of the femoral head (SIFFH) and (2) the outcomes following arthroscopic treatment with internal fixation using hydroxyapatite poly-lactate acid (HA/PLLA) threaded pins and concomitant arthroscopic treatment of associated findings. METHODS: Nine patients (median age 49.0 years, range 43-65, five female and four male patients) with SIFFH who underwent arthroscopic treatment with labral repair, capsular closure and internal fixation of SIFFH using HA/PLLA pins were retrospectively reviewed...
September 23, 2017: Knee Surgery, Sports Traumatology, Arthroscopy: Official Journal of the ESSKA
https://www.readbyqxmd.com/read/28942114/differentiation-of-mesenchymal-stem-cells-derived-trabecular-meshwork-into-dopaminergic-neuron-like-cells-on-nanofibrous-scaffolds
#11
Simin Jamali, Hossein Mostafavi, Ghasem Barati, Mehdi Eskandari, Samad Nadri
Parkinson's disease (PD) is a neurodegenerative disorder of the brain which is produced by the damage to dopaminergic neurons. Stem cell transplantation with a nanofibrous scaffold is one of the encouraging strategies for Parkinson's disease therapy. In this study, human mesenchymal stem cells (MSCs) from eye trabecular meshwork (TM) were differentiated into dopaminergic neurons on nanofibrous scaffold. After Trabecular meshwork biopsy, MSCs were isolated, cultivated on Poly-l-Lactide Acid (PLLA) nanofibrous scaffold (fabricated by electrospinning methods) and treated with medium containing DMEM supplemented with RA, IBMX and forskolin for 7 days...
September 20, 2017: Biologicals: Journal of the International Association of Biological Standardization
https://www.readbyqxmd.com/read/28936502/effects-of-stereo-regularity-on-the-single-chain-mechanics-of-polylactic-acid-and-its-implications-on-the-physical-properties-of-bulk-materials
#12
Bo Cheng, Lu Qian, Hu-Jun Qian, Zhong-Yuan Lu, Shuxun Cui
The material properties of polylactic acid (PLA) are largely determined by its stereo-regularity (tacticity). To find out the origin at the molecular level, the single-chain mechanics of poly-l-lactic acid (PLLA) and poly-d,l-lactide (PDLLA) were comparatively investigated by single-molecule atomic force microscopy (AFM). At a low concentration, PLLA adopted a random-coil conformation in a good solvent. At a high concentration, however, the PLLA chain can be induced into a helix, which consumed additional energy during unfolding by further stretching...
October 5, 2017: Nanoscale
https://www.readbyqxmd.com/read/28935254/design-of-gefitinib-loaded-poly-l-lactic-acid-microspheres-via-a-supercritical-anti-solvent-process-for-dry-powder-inhalation
#13
Qing Lin, Guijin Liu, Ziyi Zhao, Dongwei Wei, Jiafeng Pang, Yanbin Jiang
To develop a safer, more stable and potent formulation of gefitinib (GFB), micro-spheres of GFB encapsulated into poly (l-lactic acid) (PLLA) have been prepared by supercritical anti-solvent (SAS) technology in this study. Operating factors were optimized using a selected OA16 (4(5)) orthogonal array design, and the properties of the raw material and SAS processed samples were characterized by different methods The results show that the GFB-loaded PLLA particles prepared were spherical, having a smaller and narrower particle size compared with raw GFB...
September 19, 2017: International Journal of Pharmaceutics
https://www.readbyqxmd.com/read/28933867/stereocomplex-crystallization-of-star-shaped-four-armed-stereo-diblock-poly-lactide-from-the-melt-effects-of-incorporated-linear-one-armed-poly-l-lactide-or-poly-d-lactide
#14
Hideto Tsuji, Ryota Ozawa, Yuki Arakawa
Star-shaped four-armed stereo diblock poly(lactide) (4-LD) and linear one-armed PLLA or PDLA (1-L or 1-D) having a molecular weight similar to that of 4-LD [higher molecular weight 1-L(H) or 1-D(H)] and that of one block of 4-LD [lower molecular weight 1-L(L) or 1-D(L)] were synthesized, and the effects of incorporated 1-L or 1-D on the isothermal and nonisothermal crystallization of 4-LD blends from the melt were investigated. Solely stereocomplex crystallites were formed in unblended 4-LD and 4-LD blends incorporated with 1-L or 1-D during isothermal and nonisothermal crystallization...
October 17, 2017: Journal of Physical Chemistry. B
https://www.readbyqxmd.com/read/28915914/paradoxical-tunnel-enlargement-after-acl-reconstruction-with-hamstring-autografts-when-using-%C3%AE-tcp-containing-interference-screws-for-tibial-aperture-fixation-prospectively-comparative-study
#15
Joon Ho Wang, Eun Su Lee, Byung Hoon Lee
BACKGROUND: Tibial aperture fixation with a bioabsorbable interference screw is a popular fixation method in anterior cruciate ligament reconstruction (ACLR). An interference screw containing β-tricalcium phosphate (β-TCP) to improve bony integration and biocompatibility was recently introduced. This study aims to compare the clinical outcomes and radiological results of tunnel enlargement effect between the 2 bioabsorbable fixative devices of pure poly-L-lactic acid (PLLA) interference screws and β-TCP-containing screws, for tibial interference fixation in ACLR using hamstring autografts...
September 16, 2017: BMC Musculoskeletal Disorders
https://www.readbyqxmd.com/read/28901265/stereocomplexation-assisted-assembly-of-poly-g-glutamic-acid-graft-polylactide-nano-micelles-and-their-efficacy-as-anticancer-drug-carrier
#16
Shulin Dai, Yucheng Feng, Shuyi Li, Yuxiao Chen, Meiqing Liu, Chao Zhang, Wei Zhang, Yihua Yin
Micelles as drug carriers are characterized by their inherent instability due to the weak physical interactions that facilitate the self-assembly of amphiphilic block copolymers. As one of the strong physical interactions, the stereocomplexation between equal molar of enantiomeric polylactides, i.e., the poly(L-lactide) (PLLA) and poly(D-lactide) (PDLA), may be harnessed to obtain micelles with enhanced stability and drug loading capacity and consequent sustained release. In this paper, stereocomplexed micelles (γ-PGA-g-PLA micelles) were fabricated from the stereocomplexation between poly(γ-glutamic acid)-graft-PLLA (γ-PGA-g-PLLA) and poly(γ-glutamic acid)-graft-PDLA (γ-PGA-g-PDLA)...
September 11, 2017: Anti-cancer Agents in Medicinal Chemistry
https://www.readbyqxmd.com/read/28898498/recent-advances-in-processing-of-stereocomplex-type-polylactide
#17
REVIEW
Hongwei Bai, Shihao Deng, Dongyu Bai, Qin Zhang, Qiang Fu
Over the past two decades, biomass-derived and biodegradable polylactide (PLA) has sparked tremendous attention as a sustainable alternative to traditional petroleum-derived polymers for diverse applications. Unfortunately, the current applications of PLA have been mainly limited to biomedical and commodity fields, mostly because the poor heat resistance (resulting from low melting temperature) and hydrolysis stability make it hard to use as an engineering plastic. Stereocomplexation between enantiomeric poly(l-lactide) (PLLA) and poly(d-lactide) (PDLA) opens a new avenue toward PLA-based engineering plastics with improved properties...
September 12, 2017: Macromolecular Rapid Communications
https://www.readbyqxmd.com/read/28895559/sustained-releasing-sponge-like-3d-scaffolds-for-bone-tissue-engineering-applications
#18
Vidya Chamundeswari Narasimhan, Yuan Siang Lui, Yon Jin Chuah, Jing Shi Elaine Tan, Dong An Wang, Say Chye Joachim Loo
Tissue engineering (TE) is envisaged to play a vital role in improving the quality of life by restoring, maintaining or enhancing tissue and organ functions. TE scaffolds that are two dimensional (2D) in structure suffer from undesirable issues, such as pore blockage, and does not close mimic the native extra-cellular matrix (ECM) in tissues. Significant efforts have therefore been channeled to fabricate three-dimensional (3D) scaffolds using various techniques, especially electrospinning. In this study, we propose a modified one-step electrospinning process to arrive at a 3D scaffolds with highly interconnected pores...
September 12, 2017: Biomedical Materials
https://www.readbyqxmd.com/read/28894598/mechanical-behavior-of-polymer-based-vs-metallic-based-bioresorbable-stents
#19
REVIEW
Hui Ying Ang, Ying Ying Huang, Soo Teik Lim, Philip Wong, Michael Joner, Nicolas Foin
Bioresorbable scaffolds (BRS) were developed to overcome the drawbacks of current metallic drug-eluting stents (DES), such as late in-stent restenosis and caging of the vessel permanently. The concept of the BRS is to provide transient support to the vessel during healing before being degraded and resorbed by the body, freeing the vessel and restoring vasomotion. The mechanical properties of the BRS are influenced by the choice of the material and processing methods. Due to insufficient radial strength of the bioresorbable material, BRS often required large strut profile as compared to conventional metallic DES...
August 2017: Journal of Thoracic Disease
https://www.readbyqxmd.com/read/28894596/magmaris-a-new-generation-metallic-sirolimus-eluting-fully-bioresorbable-scaffold-present-status-and-future-perspectives
#20
REVIEW
Claudio Rapetto, Massimo Leoncini
Drug-eluting stents (DES) have reached a high safety and efficacy profile, becoming the best option for percutaneous coronary interventions (PCI) based revascularization. However, despite their optimal performance, a few concerns remain regarding their use, mainly due to permanent caging of the vessels and its consequences, first of all late stent thrombosis (ST). Bioresorbable scaffolds (BRS) aim to overcome these issues. The results achieved in randomized controlled trials (RCT) by the first generation of poly-L-lactic acid (PLLA) based scaffolds were promising at 1 year, but the first long term reports (albeit flawed by non-optimal implantation technique) have been disappointing, showing, for instance, an increased risk of ST and target vessel myocardial infarction (TV-MI)...
August 2017: Journal of Thoracic Disease
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