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Poly-l-lactic acid

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https://www.readbyqxmd.com/read/29454159/an-aligned-porous-electrospun-fibrous-membrane-with-controlled-drug-delivery-an-efficient-strategy-to-accelerate-diabetic-wound-healing-with-improved-angiogenesis
#1
Xiaozhi Ren, Yiming Han, Jie Wang, Yuqi Jiang, Zhengfang Yi, He Xu, Qinfei Ke
A chronic wound in diabetic patients is usually characterized by poor angiogenesis and delayed wound closure. The exploration of efficient strategy to significantly improve angiogenesis in the diabetic wound bed and thereby accelerate wound healing is still a significant challenge. Herein, we reported a kind of aligned porous poly (L-lactic acid) (PLLA) electrospun fibrous membranes containing dimethyloxalylglycine (DMOG)-loaded mesoporous silica nanoparticles (DS) for diabetic wound healing. The PLLA electrospun fibers aligned in a single direction and there were ellipse-shaped nano-pores in situ generated onto the surface of fibers, while the DS were well distributed in the fibers and the DMOG as well as Si ion could be controlled released from the nanopores on the fibers...
February 14, 2018: Acta Biomaterialia
https://www.readbyqxmd.com/read/29448837/restoring-tracheal-defects-in-a-rabbit-model-with-tissue-engineered-patches-based-on-tgf-%C3%AE-3-encapsulating-electrospun-poly-l-lactic-acid-co-%C3%AE%C2%B5-caprolactone-collagen-scaffolds
#2
Hui Jing, Botao Gao, Manchen Gao, Haiyue Yin, Xiumei Mo, Xiaoyang Zhang, Kai Luo, Bei Feng, Wei Fu, Jing Wang, Wei Zhang, Meng Yin, Zhongqun Zhu, Xiaomin He, Jinghao Zheng
Long segment tracheal stenosis often has a poor prognosis due to the limited availability of materials for tracheal reconstruction. Tissue engineered tracheal patches based on electrospun scaffolds and stem cells present ideal solutions to this medical challenge. However, the established engineering process is inefficient and time-consuming. In our research, to optimize the engineering process, core-shell nanofilms encapsulating TGF-β3 were fabricated as scaffolds for tracheal patches. The morphological and mechanical characteristics, degradation and biocompatibility of poly(l-lactic acid-co-ε-caprolactone)/collagen (PLCL/collagen) scaffolds with different compositions (PLCL:collagen 75:25, 50:50 and 25:75, respectively) were comparatively evaluated to determine the preferable compositional ratio...
February 15, 2018: Artificial Cells, Nanomedicine, and Biotechnology
https://www.readbyqxmd.com/read/29442894/graphene-oxide-incorporated-plga-nanofibrous-scaffold-for-solid-phase-gene-delivery-into-mesenchymal-stem-cells
#3
Zhiying Wang, He Shen, Saijie Song, Liming Zhang, Wei Chen, Jianwu Dai, Zhijun Zhang
Delivery of functional genes into stem cells shows great application prospect in DNA-based tissue engineering. However, comparing with epithelial cells and cancer cells, stem cells usually exhibit low gene transfection efficiency. To enhance the transfection efficiency, non-viral gene delivery in combination with biomaterial scaffolds, has raised increasing interests from researchers in tissue engineering. Nanofibers fabricated by electrospinning technique mimicking extracellular matrix (ECM) are widely used in tissue engineering applications...
April 1, 2018: Journal of Nanoscience and Nanotechnology
https://www.readbyqxmd.com/read/29442717/fabrication-of-a-novel-beta-tricalcium-phosphate-sodium-alginate-poly-d-l-lactic-acid-composite-microsphere-and-its-drug-releasing-property
#4
Xiaonan Liu, Youkui Zhang, Kun Xiong, Minhao Yan
Bone repair microspheres have been widely studied due to their convenience during clinical operations. In this study, beta tricalcium phosphate/sodium alginate/poly(D,L-lactic acid) (β-TCP/SA/PDLLA) composite microspheres were successfully prepared using the liquid droplet method. Then, β-TCP/SA/PDLLA composite microspheres were soaked in simulated body fluids (SBF) for 7 days, and tested in an X-ray diffractometer (XRD). The results indicated that sodium alginate (SA) and poly(D,L-lactic acid) (PDLLA) are not limiting factors for the transformation of β-TCP to HA...
June 1, 2018: Journal of Nanoscience and Nanotechnology
https://www.readbyqxmd.com/read/29427773/tissue-engineered-vascular-grafts-in-children-with-congenital-heart-disease-intermediate-term-followup
#5
Tadahisa Sugiura, Goki Matsumura, Shinka Miyamoto, Hideki Miyachi, Christopher K Breuer, Toshiharu Shinoka
OBJECTIVE: Tissue engineering holds great promise for the advancement of cardiovascular surgery as well as other medical fields. Tissue-engineered vascular grafts have the ability to grow and remodel and could therefore make great advances for pediatric cardiovascular surgery. In 2001, we began a human clinical trial evaluating these grafts in patients with a univentricular physiology. Herein, we report the long-term results of patients who underwent implantation of tissue-engineered vascular grafts as extracardiac total cavopulmonary conduits...
February 7, 2018: Seminars in Thoracic and Cardiovascular Surgery
https://www.readbyqxmd.com/read/29417376/complications-of-a-poly-l-lactic-acid-and-polyglycolic-acid-osteosynthesis-device-for-internal-fixation-in-maxillofacial-surgery
#6
Shintaro Sukegawa, Takahiro Kanno, Kenichi Matsumoto, Yuka Sukegawa-Takahashi, Masanori Masui, Yoshihiko Furuki
The purpose of this study was to retrospectively evaluate and examine the incidence of complications using poly-L-lactic acid and polyglycolic acid (PLLA/PGA) copolymer plate system in maxillofacial osteosynthesis. The retrospective study included 87 patients (50 men, 37 women), who needed maxillofacial surgery. We examined the proportion of complications and their factors from clinical data. A comparison was also made for plate decomposition using the molecular weight of the plate without plate exposure and complications...
February 7, 2018: Odontology
https://www.readbyqxmd.com/read/29416336/maturation-of-dendritic-cells-in-vitro-and-immunological-enhancement-of-mice-in-vivo-by-pachyman-and-or-ova-encapsulated-poly-d-l-lactic-acid-nanospheres
#7
Sisi Zheng, Tao Qin, Yu Lu, Yifan Huang, Li Luo, Zhenguang Liu, Ruonan Bo, Yuanliang Hu, Jiaguo Liu, Deyun Wang
Background: Poly lactide (PLA) was proved in the last years to be good for use in sustained drug delivery and as carriers for vaccine antigens. In our previous research, pachyman (PHY)-encapsulated PLA (PHYP) nanospheres were synthesized and their function of controlling drug release was demonstrated. Purpose: In order to modify the fast drug-release rate of PHY when inoculated alone, the maturation of bone marrow dendritic cells (BMDCs) in vitro and their immunological enhancement in vivo were explored using PHYP nanospheres...
2018: International Journal of Nanomedicine
https://www.readbyqxmd.com/read/29413240/a-randomized-trial-comparing-the-neovas-sirolimus-eluting-bioresorbable%C3%A2-scaffold-and-metallic%C3%A2-everolimus-eluting-stents
#8
Yaling Han, Bo Xu, Guosheng Fu, Xiaozeng Wang, Kai Xu, Chongying Jin, Ling Tao, Lang Li, Yuqing Hou, Xi Su, Quan Fang, Lianglong Chen, Huiliang Liu, Bin Wang, Zuyi Yuan, Chuanyu Gao, Shenghua Zhou, Zhongwei Sun, Yanyan Zhao, Changdong Guan, Gregg W Stone
OBJECTIVES: The authors sought to evaluate the safety and effectiveness of the NeoVas bioresorbable scaffold (BRS) compared with metallic drug-eluting stents. BACKGROUND: BRS have the potential to improve very late outcomes compared with metallic drug-eluting stents, but some BRS have been associated with increased rates of device thrombosis before complete bioresorption. NeoVas is a new poly-l-lactic acid BRS that elutes sirolimus from a poly-D, l-lactide coating...
February 12, 2018: JACC. Cardiovascular Interventions
https://www.readbyqxmd.com/read/29398989/the-primary-stability-of-a-bioabsorbable-poly-l-lactic-acid-suture-anchor-for-rotator-cuff-repair-is-not-improved-with-polymethylmethacrylate-or-bioabsorbable-bone-cement-augmentation
#9
Mehmet F Güleçyüz, Michael Kraus-Petersen, Christian Schröder, Andreas Ficklscherer, Markus U Wagenhäuser, Christian Braun, Peter E Müller, Matthias F Pietschmann
Background: The incidence of osteoporosis and rotator cuff tears increases with age. Cement augmentation of bones is an established method in orthopedic and trauma surgery. Questions/Purposes: This study analyses if polymethylmethacrylate or bioabsorbable cement can improve the primary stability of a bioabsorbable suture anchor in vitro in comparison to a non-augmented suture anchor in osteoporotic human humeri. Methods: The trabecular bone mineral density was measured to ensure osteopenic human specimens...
February 2018: HSS Journal: the Musculoskeletal Journal of Hospital for Special Surgery
https://www.readbyqxmd.com/read/29393693/combined-use-of-adipose-derived-stem-cells-and-tgf-%C3%AE-3-microspheres-promotes-articular-cartilage-regeneration-in-vivo
#10
Q Sun, L Zhang, T Xu, J Ying, B Xia, H Jing, P Tong
We investigated enhancement of articular cartilage regeneration using a combination of human adipose derived stem cells (hADSCs) and TGF-β3 microspheres (MS) in vivo. Poly-lactic-co-glycolic acid (PLGA)MS were prepared using a solid/oil/water emulsion solvent evaporation-extraction method. The morphology of the MS was evaluated by scanning electron microscopy (SEM). The release characteristic of the TGF-β3 MS was evaluated. A New Zealand rabbit model for experimental osteoarthritis (OA) was established using the anterior medial meniscus excision method...
February 2, 2018: Biotechnic & Histochemistry: Official Publication of the Biological Stain Commission
https://www.readbyqxmd.com/read/29388321/design-and-optimization-of-biocompatible-polycaprolactone-poly-l-lactic-co-glycolic-acid-scaffolds-with-and-without-microgrooves-for-tissue-engineering-applications
#11
Cristhiane Alvim Valente, Pedro Cesar Chagastelles, Natália Fontana Nicoletti, Giovanna Ramos Garcez, Bruna Sgarioni, Fábio Herrmann, Gustavo Pesenatto, Eduardo Goldani, Mara Lise Zanini, Maria Martha Campos, Ricardo Meurer Papaléo, Jefferson Braga da Silva, Nara Regina de, Souza Basso
This study investigated the effects of smooth and microgrooved membrane blends, with different PCL/PLGA ratios on the viability, proliferation, and adhesion of different mammalian cell types. The polymer matrices with and without microgrooves, obtained by solvent casting, were characterized by FESEM, AFM, contact angle and Young's modulus. Blend characterization showed an increase in roughness and stiffness of membranes with 30% PLGA, without any effect on the contact angle value. Pure PCL significantly decreased the viability of Vero, HaCaT, RAW 264...
February 1, 2018: Journal of Biomedical Materials Research. Part A
https://www.readbyqxmd.com/read/29385027/polymeric-micelle-of-a%C3%A2-b-type-lactosome-as-a-vehicle-for-targeting-meningeal-dissemination
#12
Kensuke Kurihara, Motoki Ueda, Isao Hara, Eiichi Ozeki, Kaori Togashi, Shunsaku Kimura
Polymeric micelle of the A₃B-type lactosome comprising (poly(sarcosine))₃-b-poly(l-lactic acid) was labeled with 111In. The 111In-labeled A₃B-type lactosome was administered to the model mice bearing meningeal dissemination and bone metastasis at mandible. With single-photon emission computed tomography (SPECT) imaging, the meningeal dissemination was identified successfully by 111In-labeled A₃B-type lactosome, which was superior to 201TlCl in regard of the imaging contrast. The 111In-labeled A₃B-type lactosome was also potential in imaging selectively of bone metastasis at mandible, whilst a nonspecific imaging of the whole bone was obtained by the SPECT imaging using 99mTc-HMDP...
January 31, 2018: Nanomaterials
https://www.readbyqxmd.com/read/29384603/toxicity-evaluation-and-anti-tumor-study-of-docetaxel-loaded-mpeg-polyester-micelles-for-breast-cancer-therapy
#13
Li Wei Tan, Bu Yun Ma, Qian Zhao, Lan Zhang, Li Juan Chen, Jin Rong Peng, Zhi Yong Qian
In this work, docetaxel (DTX) was encapsulated in monomethoxy poly(ethylene glycol)-poly(ε-caprolactone) (mPEG-PCL) micelles and monomethoxy poly(ethylene glycol)-poly(D, L-lactic acid) (mPEG-PLA) micelles, respectively. For the further application, the acute/genetic toxicity evaluation and pharmacokinetic/pharmacodynamic study of the two kinds of micellar nanomedicines were performed. In the study of anticancer activity in vitro and in vivo, DTX micelles showed better tumorgrowth inhibition than free DTX...
April 2017: Journal of Biomedical Nanotechnology
https://www.readbyqxmd.com/read/29383946/nanoscale-modification-of-chrysin-for-improved-of-therapeutic-efficiency-and-cytotoxicity
#14
Ghassan M Sulaiman, Majid S Jabir, Anaheed H Hameed
Chrysin, as a flavone, is a promising drug candidate because of its multifaceted properties, such as anti-inflammatory, antioxidant and anticancer. However, its poor bioavailability is a bottleneck for pharmaceutical applications. To enhance the bioactive effects, chrysin-loaded poly (D,L-lactic-co-glycolic acid) and polyvinyl alcohol were successfully prepared to overcome problems associated with chrysin. The properties of modified nanochrysin were analysed by in vitro dissolution study, XRD, FTIR and SEM...
January 31, 2018: Artificial Cells, Nanomedicine, and Biotechnology
https://www.readbyqxmd.com/read/29383933/chemically-active-porous-3d-printed-thermoplastic-composites
#15
Kent Evans, Zachary C Kennedy, Bruce W Arey, Josef F Christ, Herbert Todd Schaef, Satish K Nune, Rebecca L Erikson
Metal-organic frameworks (MOFs) exhibit exceptional properties and are widely investigated because of their structural and functional versatility relevant to catalysis, separations, and sensing applications. However, their commercial or large-scale application is often limited by their powder forms which make integration into devices challenging. Here, we report the production of MOF-thermoplastic polymer composites in well-defined and customizable forms and with complex internal structural features accessed via a standard 3D printer...
January 31, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29359919/biocompatible-poly-catecholamine-film-electrode-for-potentiometric-cell-sensing
#16
Taira Kajisa, Yoshiyuki Yanagimoto, Akiko Saito, Toshiya Sakata
Surface-coated poly(catecholamine) (pCA) films have attracted attention as biomaterial interfaces owing to their biocompatible and physicochemical characteristics. In this paper, we report that pCA-film-coated electrodes are useful for potentiometric biosensing devices. Four different types of pCA film-L-dopa, dopamine, norepinephrine, and epinephrine-with thicknesses in the range of 7-27 nm were electropolymerized by oxidation on Au electrodes by using cyclic voltammetry. By using the pCA-film electrodes, the pH responsivities were found to be 39...
January 23, 2018: ACS Sensors
https://www.readbyqxmd.com/read/29338816/fabrication-of-isoniazid-rifampicin-poly-l-lactic-acid-donut-shaped-implants-via-three-dimensional-printing-technique
#17
Gui Wu, Wei Gang Wu, Jian Bo Zhou, Qi Xin Zheng
Objective To investigate the possibility of manufacturing dual-drug loaded isoniazid/rifampicin/poly L-lactic acid (PLLA) implant with donut-shaped structure via three-dimensional (3D) printing technique and study the drug release characteristic and biocompatibility of the implant in vitro.Methods PLLA was crushed into particles with diameters around 75-100 μm.Isoniazid and rifampicin bulk drugs were dissolved into the organic dissolvent respectively to be the binding liquid.The 3D printing machine fabricated the donut-shaped implant via binding the PLLA powder layer by layer...
December 20, 2017: Zhongguo Yi Xue Ke Xue Yuan Xue Bao. Acta Academiae Medicinae Sinicae
https://www.readbyqxmd.com/read/29334430/preclinical-therapeutic-efficacy-of-the-ciprofloxacin-eluting-sinus-stent-for-pseudomonas-aeruginosa-sinusitis
#18
Do-Yeon Cho, Dong-Jin Lim, Calvin Mackey, Daniel Skinner, Christopher Weeks, Gobind S Gill, Robert W Hergenrother, William E Swords, Bradford A Woodworth
BACKGROUND: The ciprofloxacin-coated sinus stent (CSS) has unique therapeutic potential to deliver antibiotics to the sinuses. The objective of this study is to evaluate the efficacy of the CSS stent in eliminating Pseudomonas aeruginosa infection in a rabbit model of sinusitis. METHODS: A ciprofloxacin-eluting sinus stent was created by coating ciprofloxacin/Eudragit RS100 on biodegradable poly-D/L-lactic acid (2 mg). After analyzing in-vitro inhibition of P aeruginosa (PAO-1 strain) biofilm formation, a total of 8 stents (4 shams, 4 CSSs) were placed unilaterally in rabbit maxillary sinuses via dorsal sinusotomy after inducing infection for 1 week with PAO-1...
January 15, 2018: International Forum of Allergy & Rhinology
https://www.readbyqxmd.com/read/29334080/effects-of-microarchitecture-and-mechanical-properties-of-3d-microporous-plla-plga-scaffolds-on-fibrochondrocyte-and-l929-fibroblast-behavior
#19
Gokhan Bahcecioglu, Nesrin Hasırcı, Vasif Hasirci
There are several reports studying cell behavior on surfaces in 2D or in hydrogels in 3D. However, cell behavior in 3D microporous scaffolds has not been investigated extensively. In this study, poly(L-lactic acid)/poly(lactic acid-co-glycolic acid) (PLLA/PLGA)-based microporous scaffolds were used to study the effects of scaffold microarchitecture and mechanical properties on the behavior of two different cell types, human meniscal fibrochondrocytes and L929 mouse fibroblasts. In general, cell attachment, spreading and proliferation rate were mainly regulated by the strut stiffness...
January 15, 2018: Biomedical Materials
https://www.readbyqxmd.com/read/29329052/efficient-and-cost-effective-generation-of-hepatocyte-like-cells-through-microparticle-mediated-delivery-of-growth-factors-in-a-3d-culture-of-human-pluripotent-stem-cells
#20
Zeinab Heidariyan, Mohammad Hossein Ghanian, Mohsen Ashjari, Zahra Farzaneh, Mostafa Najarasl, Mehran Rezaei Larijani, Abbas Piryaei, Massoud Vosough, Hossein Baharvand
Biomedical application of human pluripotent stem cell-derived hepatocyte-like cells (hPSC-HLCs) relies on efficient large-scale differentiation, which is commonly performed by a suspension culture of three-dimensional (3D) multicellular spheroids in bioreactors. However, this approach requires large amounts of growth factors (GFs) and the need to overcome limited diffusional transport posed by the inherent 3D structure of hPSC spheroids. Here, we have hypothesized that localized delivery of GFs by incorporation of GF-laden degradable polymeric microparticles (MPs) within the hPSC spheroids would circumvent such limitations...
January 2, 2018: Biomaterials
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