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Poly-l-lactic acid

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https://www.readbyqxmd.com/read/28096400/defining-recovery-neurobiology-of-injured-spinal-cord-by-synthetic-matrix-assisted-hmsc-implantation
#1
Alexander E Ropper, Devang K Thakor, InBo Han, Dou Yu, Xiang Zeng, Jamie E Anderson, Zaid Aljuboori, Soo-Woo Kim, Hongjun Wang, Richard L Sidman, Ross D Zafonte, Yang D Teng
Mesenchymal stromal stem cells (MSCs) isolated from adult tissues offer tangible potential for regenerative medicine, given their feasibility for autologous transplantation. MSC research shows encouraging results in experimental stroke, amyotrophic lateral sclerosis, and neurotrauma models. However, further translational progress has been hampered by poor MSC graft survival, jeopardizing cellular and molecular bases for neural repair in vivo. We have devised an adult human bone marrow MSC (hMSC) delivery formula by investigating molecular events involving hMSCs incorporated in a uniquely designed poly(lactic-co-glycolic) acid scaffold, a clinically safe polymer, following inflammatory exposures in a dorsal root ganglion organotypic coculture system...
January 17, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28095577/optimizing-injections-of-poly-l-lactic-acid-the-6-step-technique
#2
Shino Bay Aguilera, Sean Branch, Luis Soro
The authors present a reproducible and effective technique utilizing poly-L-lactic acid for panfacial revolumization. The variable dilution ratios, reconstitution times, injection techniques and rates of nodule formation with poly-L-lactic acid can be intimidating to even experienced injectors. While there is no single cookie-cutter approach to facial volumization, this 6-step "Precise Sculpt" technique can be used as a template to reliably achieve optimal results while minimizing the risk of adverse events...
December 1, 2016: Journal of Drugs in Dermatology: JDD
https://www.readbyqxmd.com/read/28079309/bioactive-injectable-aggregates-with-nanofibrous-microspheres-and-human-dental-pulp-stem-cells-a-translational-strategy-in-dental-endodontics
#3
I Garzón, M A Martin-Piedra, V Carriel, M Alaminos, X Liu, R D Souza
Regeneration of the pulp-dentin complex with stem cells is a potential alternative to conventional root canal treatments. Human dental pulp stem cells (hDPSCs) have been extensively studied because of their ability to proliferate and differentiate into mineralized dental and nondental tissues. In this work we combined hDPSCs with two types of injectable poly-L-lactic acid (PLLA) microspheres with a nanofibrous or smooth surface to form bioactive injectable aggregates, and examined their ability to promote pulp regeneration in the root canal in an in vivo model...
January 12, 2017: Journal of Tissue Engineering and Regenerative Medicine
https://www.readbyqxmd.com/read/28067362/electrochemical-manipulation-of-cell-populations-supported-by-biodegradable-polymeric-nanosheets-for-cell-transplantation-therapy
#4
Jin Suzuki, Nobuhiro Nagai, Matsuhiko Nishizawa, Toshiaki Abe, Hirokazu Kaji
We describe an electrochemical method of harvesting cells cultured on a biodegradable polymeric nanosheet (cell/nanosheet construct), which is stabilized on a self-assembled monolayer (SAM) of thiol molecules. A poly(lactic-co-glycolic acid) (PLGA) nanosheet was attached by hydrophobic interactions onto the surface of a SAM of l-cysteine coated onto a gold electrode. Retinal pigment epithelial cell lines (RPE-J cells) were cultured on the nanosheet to form a monolayer. An AA-size dry battery was used to apply a negative electrical potential, causing reductive desorption of the SAM from the gold surface...
January 9, 2017: Biomaterials Science
https://www.readbyqxmd.com/read/28062368/epothilone-b-based-3-in-1-polymeric-micelle-for-anticancer-drug-therapy
#5
Dae Hwan Shin, Glen S Kwon
Epothilones are microtubule inhibitors that are promising alternatives to paclitaxel due to enhanced anticancer efficacy. While epothilones are slightly more water soluble than paclitaxel and more active against paclitaxel-resistant cells, they still require formulation with Cremophor EL and/or cosolvents and drug resistance still limits therapeutic efficacy. In this report, we showed that the combinational treatment of epothilone B (EpoB), 17-N-allylamino-17-demethoxygeldanamycin (17-AAG, Hsp90 inhibitor), and rapamycin (mTOR inhibitor) displays strong anticancer activity in vitro and in vivo...
January 3, 2017: International Journal of Pharmaceutics
https://www.readbyqxmd.com/read/28057509/promoting-bioengineered-tooth-innervation-using-nanostructured-and-hybrid-scaffolds
#6
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/28054637/salidroside-promotes-peripheral-nerve-regeneration-based-on-tissue-engineering-strategy-using-schwann-cells-and-plga-in-vitro-and-in-vivo
#7
Hui Liu, Peizhen Lv, Yongjia Zhu, Huayu Wu, Kun Zhang, Fuben Xu, Li Zheng, Jinmin Zhao
Salidriside (SDS), a phenylpropanoid glycoside derived from Rhodiola rosea L, has been shown to be neuroprotective in many studies, which may be promising in nerve recovery. In this study, the neuroprotective effects of SDS on engineered nerve constructed by Schwann cells (SCs) and Poly (lactic-co-glycolic acid) (PLGA) were studied in vitro. We further investigated the effect of combinational therapy of SDS and PLGA/SCs based tissue engineering on peripheral nerve regeneration based on the rat model of nerve injury by sciatic transection...
January 5, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28052196/dna-nanostructures-mediated-molecular-imprinting-lithography
#8
Cheng Tian, Hyojeong Kim, Wei Sun, Yunah Kim, Peng Yin, Haitao Liu
This paper describes the fabrication of polymer stamps using DNA nanostructure templates. This process creates stamps having diverse nanoscale features with dimensions ranging from several tens of nanometers to micrometers. DNA nanostructures including DNA nanotubes, stretched λ-DNA, two-dimensional (2D) DNA brick crystals with three-dimensional (3D) features, hexagonal DNA 2D arrays, and triangular DNA origami were used as master templates to transfer patterns to poly(methyl methacrylate) and poly(l-lactic acid) with high fidelity...
January 10, 2017: ACS Nano
https://www.readbyqxmd.com/read/28044473/synthesis-characterization-and-in-vitro-evaluation-of-targeted-gold-nanoshelled-poly-d-l-lactide-co-glycolide-nanoparticles-carrying-anti-p53-antibody-as-a-theranostic-agent-for-ultrasound-contrast-imaging-and-photothermal-therapy
#9
Li Xu, Caifeng Wan, Jing Du, Hongli Li, Xuesong Liu, Hong Yang, Fenghua Li
Breast cancer is the leading cause of cancer-related deaths in women and earlier detection can substantially reduce deaths from breast cancer. Polymers with targeted ligands are widely used in the field of molecular ultrasound imaging and targeted tumor therapy. In our study, the nanotheranostic agent was fabricated through filling perfluoropropane (C3F8) into poly(D,L-lactic-co-glycolic acid) nanoparticles (PLGA NPs), followed by the formation of gold nanoshell on the surface, then conjugated with anti p53 antibody which has high specificity with the p53 protein overexpressing in breast cancer...
January 3, 2017: Journal of Biomaterials Science. Polymer Edition
https://www.readbyqxmd.com/read/28043126/adjuvanticity-regulation-by-biodegradable-polymeric-nano-microparticle-size
#10
Jilei Jia, Weifeng Zhang, Qi Liu, Tingyuan Yang, Lianyan Wang, Guanghui Ma
Polymeric nano/microparticles as vaccine adjuvants have been researched in experimental and clinical studies. A more profound understanding of how the physicochemical properties regulate specific immune responses has become a vital requirement. Here we prepared poly(d,l-lactic-co-glycolic acid) (PLGA) nano/microparticles with uniform sizes (500 nm, 900 nm, 2.1 μm, and 4.9 μm), and the size effects on particle uptake, activation of macrophages, and antigen internalization were evaluated. Particle uptake kinetic studies demonstrated that 900 nm particles were the easiest to accumulate in cells...
January 3, 2017: Molecular Pharmaceutics
https://www.readbyqxmd.com/read/28042606/oxygen-sensing-difluoroboron-%C3%AE-diketonate-polylactide-materials-with-tunable-dynamic-ranges-for-wound-imaging
#11
Christopher A DeRosa, Scott A Seaman, Alexander S Mathew, Catherine M Gorick, Ziyi Fan, James N Demas, Shayn M Peirce, Cassandra L Fraser
Difluoroboron β-diketonate poly(lactic acid) materials exhibit both fluorescence (F) and oxygen sensitive room-temperature phosphorescence (RTP). Introduction of halide heavy atoms (Br and I) is an effective strategy to control the oxygen sensitivity in these materials. A series of naphthyl-phenyl (nbm) dye derivatives with hydrogen, bromide and iodide substituents were prepared for comparison. As nanoparticles, the hydrogen derivative was hypersensitive to oxygen (0-0.3%), while the bromide analogue was suited for hypoxia detection (0-3% O2)...
November 23, 2016: ACS Sensors
https://www.readbyqxmd.com/read/28039620/primordial-germ-cell-differentiation-of-nuclear-transfer-embryonic-stem-cells-using-surface-modified-electroconductive-scaffolds
#12
Tarlan Eslami-Arshaghi, Saeid Vakilian, Ehsan Seyedjafari, Abdolreza Ardeshirylajimi, Masoud Soleimani, Mohammad Salehi
A combination of nanotopographical cues and surface modification of collagen and fibronectin is a potential platform in primordial germ cells (PGCs) differentiation. In the present study, the synergistic effect of nanotopography and surface modification on differentiation of nuclear transfer embryonic stem cells (nt-ESCs) toward PGC lineage was investigated. In order to achieve this goal, poly-anyline (PANi) was mix within poly-L-lactic acid (PLLA). Afterward, the random composite mats were fabricated using PLLA and PANi mix solution...
December 30, 2016: In Vitro Cellular & Developmental Biology. Animal
https://www.readbyqxmd.com/read/28039591/visualizing-polymeric-bioresorbable-scaffolds-with-three-dimensional-image-reconstruction-using-contrast-enhanced-micro-computed-tomography
#13
Sheng Tu, Fudong Hu, Wei Cai, Liyan Xiao, Linlin Zhang, Hong Zheng, Qiong Jiang, Lianglong Chen
There are no previous studies showing how to visualize polymeric bioresorbable scaffolds (BRSs) by micro-computed tomography (mCT). There are no previous studies showing how to visualize polymeric bioresorbable scaffolds (BRSs) by micro-computed tomography (mCT). This study aimed to explore the feasibility of detecting polymeric BRS with 3-dimensional reconstruction of BRS images by contrast-enhanced mCT and to determine the optimal imaging settings. BRSs, made of poly-L-lactic acid (PLLA), were implanted in coronary bifurcation models...
December 30, 2016: International Journal of Cardiovascular Imaging
https://www.readbyqxmd.com/read/28039004/localized-inhibition-of-p2x7r-at-the-spinal-cord-injury-site-improves-neurogenic-bladder-dysfunction-by-decreasing-urothelial-p2x3r-expression-in-rats
#14
Alvaro Munoz, Iman K Yazdi, Xiufeng Tang, Carolina Rivera, Nima Taghipour, Robert G Grossman, Timothy B Boone, Ennio Tasciotti
AIMS: Reestablishment of bladder function in patients with spinal cord injury (SCI) is a clinical priority. Our objectives were to determine whether SCI-localized inhibition of purinergic P2X7 receptors (P2X7R) improve bladder function by decreasing afferent signals mediated by urothelial P2X3R. MAIN METHODS: Systemic inhibition of P2X7R may improve locomotion in rodent SCI models; however, beneficial effects on bladder function and its physiological mechanisms have not been evaluated...
December 27, 2016: Life Sciences
https://www.readbyqxmd.com/read/28030952/calcium-stearate-as-an-effective-alternative-to-poly-vinyl-alcohol-in-poly-lactic-co-glycolic-acid-nanoparticles-synthesis
#15
Claudia Cella, Irini Gerges, Paolo Milani, Cristina Lenardi, Simona Argentiere
Poly(D,L-lactic-co-glycolic acid) (PLGA) nanoparticles(NPs) are among the most studied systems for drug and gene targeting. So far, the synthesis of stable and uniform PLGA NPs has involved the use of a large excess of polyvinyl surfactants such as polyvinyl alcohol (PVA) and polyvinyl pyrrolidone (PVP), whose removal requires multi-step purification procedures of high ecological and economic impact. Hence the development of environment-friendly and cost-effective synthetic procedures for the synthesis of PLGA NPs would effectively boost their use in clinics...
December 28, 2016: Biomacromolecules
https://www.readbyqxmd.com/read/28025048/tropoelastin-inhibits-intimal-hyperplasia-of-mouse-bioresorbable-arterial-vascular-grafts
#16
Tadahisa Sugiura, Riddhima Agarwal, Shuhei Tara, Tai Yi, Yong-Ung Lee, Christopher K Breuer, Anthony S Weiss, Toshiharu Shinoka
: Neointimal hyperplasia, which results from the activation, proliferation and migration of vascular smooth muscle cells (SMCs), is a detrimental condition for vascular stents or vascular grafts that leads to stenosis. Preventing neointimal hyperplasia of vascular grafts is critically important for the success of arterial vascular grafts. We hypothesized that tropoelastin seeding onto the luminal surface of the graft would prevent neointimal hyperplasia through suppressing neointimal smooth muscle cell proliferation...
December 23, 2016: Acta Biomaterialia
https://www.readbyqxmd.com/read/28024641/poly-amido-amine-and-nano-calcium-phosphate-bonding-agent-to-remineralize-tooth-dentin-in-cyclic-artificial-saliva-lactic-acid
#17
Kunneng Liang, Michael D Weir, Mark A Reynolds, Xuedong Zhou, Jiyao Li, Hockin H K Xu
The objectives of this study were to develop a novel method to remineralize dentin lesions, and investigate the remineralization effects of poly (amido amine) (PAMAM) dendrimer plus a bonding agent with nanoparticles of amorphous calcium phosphate (NACP) in a cyclic artificial saliva/lactic acid environment for the first time. Dentin lesions were produced via phosphoric acid. Four groups were tested: (1) dentin control, (2) dentin with PAMAM, (3) dentin with NACP bonding agent, and (4) dentin with PAMAM plus NACP bonding agent...
March 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28024575/effect-of-mg-content-on-the-thermal-stability-and-mechanical-behaviour-of-plla-mg-composites-processed-by-hot-extrusion
#18
S C Cifuentes, M Lieblich, F A López, R Benavente, J L González-Carrasco
In the field of bioabsorbable composites for biomedical applications, extrusion has been employed as a method to prepare homogeneous blends of polymeric matrices with bioactive ceramic fillers. In this work, the suitability of processing poly-l-lactic acid/Magnesium (PLLA/Mg) composites by hot extrusion has been assessed by a systematic characterization of PLLA/Mg composites containing different amounts of Mg particles up to 7wt%. The results show that extrusion causes a reduction of almost 20% in the viscosity average molecular weight of PLLA, which further decreases with increasing Mg content...
March 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28024094/effect-on-surface-character-and-mechanical-property-of-unsintered-hydroxyapatite-poly-l-lactic-acid-uha-plla-material-by-uv-treatment
#19
Akinori Moroi, Masaki Okuno, Go Kobayashi, Hitoshi Gamo, Izumi Serizawa, Kunio Yoshizawa, Hiroumi Ikawa, Koichiro Ueki
Materials fabricated with unsintered hydroxyapatite/poly-l-lactic acid (uHA/PLLA) exhibit biological activity and biocompatibility, but are also hydrophobic. This hydrophobicity limits the ability of cells or tissues to adhere to the surface of the material and thereby prevents the materials from exhibiting effective biological activity. In this study, we examined the effects of ultraviolet (UV) treatment on the hydrophobicity of uHA/PLLA. We compared the contact angle, mechanical strength, cell attachment, and cell differentiation capacity between untreated uHA/PLLA and uHA/PLLA treated with UV light...
December 26, 2016: Journal of Biomedical Materials Research. Part B, Applied Biomaterials
https://www.readbyqxmd.com/read/28018952/change-in-thermal-transitions-and-water-uptakes-of-poly-l-lactic-acid-blends-upon-hydrolytic-degradation
#20
Hideko T Oyama, Daisuke Tanishima, Shintaro Maekawa
This article reports experimental data related to the research article entitled "Poly(malic acid-co-l-lactide) as a Superb Degradation Accelerator for Poly(l-lactic acid) at Physiological Conditions" (H.T. Oyama, D. Tanishima, S. Maekawa, 2016) [1]. Hydrolytic degradation of poly(l-lactic acid) (PLLA) blends with poly(aspartic acid-co-l-lactide) (PAL) and poly(malic acid-co-l-lactide) (PML) oligomers was investigated in a phosphate buffer solution at 40 °C. It was found in the differential scanning calorimetry measurements that upon hydrolysis the cold crystallization temperature (Tc ) and the melting temperature (Tm ) significantly shifted to lower temperature...
February 2017: Data in Brief
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