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Poly-l-lactic acid

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https://www.readbyqxmd.com/read/28419685/scaffolds-for-epithelial-tissue-engineering-customized-in-elastomeric-molds
#1
Mohamed-Nur Abdallah, Sara Abdollahi, Marco Laurenti, Dongdong Fang, Simon D Tran, Marta Cerruti, Faleh Tamimi
Restoration of soft tissue defects remains a challenge for surgical reconstruction. In this study, we introduce a new approach to fabricate poly(d,l-lactic acid) (PDLLA) scaffolds with anatomical shapes customized to regenerate three-dimensional soft tissue defects. Highly concentrated polymer/salt mixtures were molded in flexible polyether molds. Microcomputed tomography showed that with this approach it was possible to produce scaffolds with clinically acceptable volume ratio maintenance (>90%). Moreover, this technique allowed us to customize the average pore size and pore interconnectivity of the scaffolds by using variations of salt particle size...
April 18, 2017: Journal of Biomedical Materials Research. Part B, Applied Biomaterials
https://www.readbyqxmd.com/read/28418758/inhaled-heparin-therapeutic-efficacy-and-recent-formulations
#2
Ayca Yildiz-Pekoz, Yildiz Ozsoy
Heparin is well known for its anticoagulant and anti-inflammatory properties. Inhaled heparin regimens are increasingly being used to manage lung disease. It has been used to treat cystic fibrosis, thromboembolism, and pulmonary fibrosis, as well as bronchial asthma and asthma-induced airway hypersensitivity. Several preclinical studies attained some useful effects of heparin-administered, parenterally and through inhalation, treatment of lung disease. Besides, recent clinical trials suggest that inhaled heparin for lung diseases is beneficial and safe, but such data remain to be limited...
April 18, 2017: Journal of Aerosol Medicine and Pulmonary Drug Delivery
https://www.readbyqxmd.com/read/28415912/a-method-for-the-immunohistochemical-identification-and-localization-of-osterix-in-periosteum-wrapped-constructs-for-tissue-engineering-of-bone
#3
Phillip McClellan, Robin Jacquet, Qing Yu, William J Landis
A novel immunohistochemistry (IHC) approach has been developed to label and localize osterix, a bone-specific transcription factor, within formalin-fixed, paraffin-embedded, tissue-engineered constructs uniquely containing synthetic polymers and human periosteal tissue. Generally, such specimens consisting in part of polymeric materials and mineral are particularly difficult for IHC identification of proteins. Samples here were fabricated from human periosteum, electrospun poly-l-lactic acid (PLLA) nanofibers, and polycaprolactone/poly-l-lactic acid (PCL/PLLA, 75/25) scaffolds and harvested following 10 weeks of implantation in athymic mice...
April 1, 2017: Journal of Histochemistry and Cytochemistry: Official Journal of the Histochemistry Society
https://www.readbyqxmd.com/read/28415542/bladder-smooth-muscle-cells-on-electrospun-poly-%C3%AE%C2%B5-caprolactone-poly-l-lactic-acid-scaffold-promote-bladder-regeneration-in-a-canine-model
#4
Nasser Shakhssalim, Masoud Soleimani, Mohammad M Dehghan, Javad Rasouli, Masoud Taghizadeh-Jahed, Peyman M Torbati, Mohammad Naji
Engineering of urinary bladder has been the focus of numerous studies in recent decade. Novel biomaterials, innovative fabrication methods and various modification processes of scaffolds are the critical issues to find supportive matrices. Supportive characteristics of electrospun PCL/PLLA nano-scaffold for bladder augmentation in canine model and the role of bladder cells in regeneration process were appraised. Electrospun PCL/PLLA was fabricated by co-electrospinning of PCL and PLLA. Bladder cells were isolated and transduced with lentiviral particles encoding eGFP and JRed proteins...
June 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28415467/poly-l-lactic-acid-and-polyurethane-nanofibers-fabricated-by-solution-blow-spinning-as-potential-substrates-for-cardiac-cell-culture
#5
Ewelina Tomecka, Michal Wojasinski, Elzbieta Jastrzebska, Michal Chudy, Tomasz Ciach, Zbigniew Brzozka
This paper presents a comparison and evaluation of cardiac cell proliferation on poly(l-lactic acid) (PLLA) and polyurethane (PU) nanofibrous mats fabricated by solution blow spinning (SBS). Three different cardiac cell lines: rat cardiomyoblasts (H9C2 line), human (HCM) and rat cardiomyocytes (RCM) were used for experiments. Cell morphology, orientation and proliferation were investigated on non-modified and protein-modified (fibronectin, collagen, gelatin, laminin, poly-l-lysine) surfaces of both types of nanofibers...
June 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28415405/incorporation-of-glass-reinforced-hydroxyapatite-microparticles-into-poly-lactic-acid-electrospun-fibre-mats-for-biomedical-applications
#6
Daniel Santos, Cristina O Correia, Dina M Silva, Pedro S Gomes, Maria H Fernandes, José D Santos, Vitor Sencadas
Tissue engineering is constantly evolving towards novel materials that mimic the properties of the replaced injured tissue or organ. A hybrid electrospun membrane of electroactive poly(l-acid lactic) (PLLA) polymer with glass reinforced hydroxyapatite (Bonelike®) microparticles placed among the polymer fibres in a morphology like "islands in the sea" was processed. The incorporation of 60 to 80wt% Bonelike® bone grafts granules with ≤150μm into the polymer solution lead to an amorphous polymeric fibre membranes, and a decrease of the average polymer fibre diameter from 550±150nm for neat PLA down to 440±170nm for the hybrid composite...
June 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28415397/surface-modified-bioresorbable-electrospun-scaffolds-for-improving-hemocompatibility-of-vascular-grafts
#7
Pablo C Caracciolo, María Isabel Rial-Hermida, Florencia Montini-Ballarin, Gustavo A Abraham, Angel Concheiro, Carmen Alvarez-Lorenzo
The replacement of small-diameter vessels is one of the main challenges in tissue engineering. Moreover, the surface modification of small-diameter vascular grafts (SDVG) is a key factor in the success of the therapy due to their increased thrombogenicity and infection susceptibility caused by the lack of a functional endothelium. In this work, electrospun scaffolds were prepared from blends of poly(L-lactic acid) (PLLA) and segmented polyurethane (PHD) with a composition designed to perform as SDVG inner layer...
June 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28414284/-antineoplastic-mechanisms-of-niclosamide-loaded-nanoparticles-in-human-colorectal-cancer-cells
#8
A S Zhirnik, Y P Semochkina, E Yu Moskaleva, N I Krylov, I A Tubasheva, S L Kuznetsov, E A Vorontsov
Using poly(lactic-co-glycolic) acid we developed a polymeric form of niclosamide (PFN) and investigated molecular mechanisms underlying its antitumor activity against human colorectal cancer cell lines (SW837, Caco-2, COLO 320 HSR). PFN was shown to be more cytotoxic against cancer cells and less cytotoxic against normal cells (human embryonic lung fibroblasts) as compared to niclosamide. Both niclosamide and its polymeric form caused mitochondrial damage (evaluated as a decrease in rhodamine 123 accumulation) and increased the levels of reactive oxygen species, particularly mitochondrial superoxide, resulting in the oxidative damage to biomolecules...
March 2017: Biomedit︠s︡inskai︠a︡ Khimii︠a︡
https://www.readbyqxmd.com/read/28411547/mechanical-properties-and-state-of-miscibility-in-poly-racd-l-lactide-co-glycolide-l-lactide-co-%C3%AE%C2%B5-caprolactone-blends
#9
S Petisco-Ferrero, A Etxeberria, J R Sarasua
Polymers based on lactic acid (PLA) are a very promising category of biopolymers. As they are multi-stimuli responsive, can, in many ways, positively interact with the host, stimulating the innate reparative machinery of the human body. Since biopolymers for medical applications are subject to restrictive regulations, blending stands out as an effective method for obtaining tailored properties within a reduced time to market if compared to synthesis. Hence, in this study a set of PDLGA/PLCL blends was obtained by means of thermoplastic techniques and then further characterized...
April 6, 2017: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/28409145/extra-articular-and-transcutaneous-migration-of-the-poly-l-d-lactide-interference-screw-after-popliteal-tendon-reconstruction
#10
Camilo Partezani Helito, Noel O Foni, Marcelo Batista Bonadio, José Ricardo Pécora, Marco Kawamura Demange, Fabio Janson Angelini
Knee ligament reconstructions are commonly performed orthopedic procedures. Graft fixation is generally performed with metallic or absorbable interference screws. In a recent study, only ten reports of screw migration were retrieved; of these, only one was not related to the anterior cruciate ligament, and the majority was related to the use of poly-l-lactic acid (PLLA) screws. Only one case retrieved in the literature reported screw migration in reconstructions of the posterolateral corner, and that was to the intra-articular region...
March 2017: Revista Brasileira de Ortopedia
https://www.readbyqxmd.com/read/28405914/cyclosporine-a-loaded-electrospun-poly-d-l-lactic-acid-poly-ethylene-glycol-nanofibers-drug-carriers-utilizable-in-local-immunosuppression
#11
Jakub Sirc, Zuzana Hampejsova, Jana Trnovska, Petr Kozlik, Jakub Hrib, Radka Hobzova, Alena Zajicova, Vladimir Holan, Zuzana Bosakova
PURPOSE: The present study aims to prepare poly(D,L-lactic acid) (PLA) nanofibers loaded by the immunosuppressant cyclosporine A (CsA, 10 wt%). Amphiphilic poly(ethylene glycol)s (PEG) additives were used to modify the hydrophobic drug release kinetics. METHODS: Four types of CsA-loaded PLA nanofibrous carriers varying in the presence and molecular weight (MW) of PEG (6, 20 and 35 kDa) were prepared by needleless electrospinning. The samples were extracted for 144 h in phosphate buffer saline or tissue culture medium...
April 12, 2017: Pharmaceutical Research
https://www.readbyqxmd.com/read/28398439/increased-humidity-can-soften-glassy-langmuir-polymer-films-by-two-mechanisms-plasticization-of-the-polymer-material-and-suppression-of-the-evaporation-cooling-effect
#12
Hyun Chang Kim, Yun Hwa Choi, Wei Bu, Mati Meron, Binhua Lin, You-Yeon Won
Glassy Langmuir polymer films exhibit a rapid increase in surface pressure at high compression. High relative humidity typically mitigates this increase in surface pressure. In an attempt to understand the origin of this phenomenon, we investigated the effects of relative humidity on surface pressure-area isotherm properties for four different types of polymers with similar bulk glass transition temperatures: poly(d,l-lactic-co-glycolic acid) (PLGA, Tg ≈ 45 °C), poly(vinyl acetate) (PVAc, Tg ≈ 41 °C), poly(n-propyl methacrylate) (PnPMA, Tg ≈ 41 °C), and poly(vinyl stearate) (PVS, Tg ≈ 47 °C, Tm ≈ 47 °C)...
April 19, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28397293/the-role-of-fillers-in-the-management-of-acne-scars
#13
REVIEW
E Forbat, F R Ali, F Al-Niaimi
Acne scars are present in 95% of patients with acne, and can cause profound psychosocial morbidity. Fillers are commonly used for facial soft tissue augmentation, and there is increasing interest in their use for the treatment of acne scars, particularly for the atrophic subtype. We review the evidence for the use of temporary, semi-permanent and permanent fillers for acne scars. The use of permanent methylmethacrylate fillers for acne scarring is supported by a randomized controlled trial, and is approved by the United States Food and Drug Administration...
April 10, 2017: Clinical and Experimental Dermatology
https://www.readbyqxmd.com/read/28392414/micro-flow-imaging-as-a-quantitative-tool-to-assess-size-and-agglomeration-of-plga-microparticles
#14
Miranda M C van Beers, Cees Slooten, Jelte Meulenaar, Ahmad S Sediq, Ruud Verrijk, Wim Jiskoot
The purpose of this study was to explore the potential of flow imaging microscopy to measure particle size and agglomeration of poly(D,L-lactic-co-glycolic acid) (PLGA) microparticles. The particle size distribution of pharmaceutical PLGA microparticle products is routinely determined with laser diffraction. In our study, we performed a unique side-by-side comparison between MFI 5100 (flow imaging microscopy) and Mastersizer 2000 (laser diffraction) for the particle size analysis of two commercial PLGA microparticle products, i...
April 6, 2017: European Journal of Pharmaceutics and Biopharmaceutics
https://www.readbyqxmd.com/read/28391698/pegylated-nanoemulsions-for-oral-delivery-role-of-the-inner-core-on-the-final-fate-of-the-formulation
#15
Manuel J Santander-Ortega, Maria Plaza-Oliver, Virginia Rodriguez-Robledo, Lucia Castro-Vazquez, Noemi Villaseca-Gonzalez, Joaquin Gonzalez-Fuentes, Emilio L Cano, Pilar Marcos, Maria Victoria Lozano, Maria Mar Arroyo-Jimenez
During the last decade, there has been growing interest to grant nanoparticles with diffusion properties across mucosae. In this sense, the non-ionic block copolymer Pluronic F127 (PF127) has arisen as a promising coating agent to formulate mucus penetrating particles (MPP). In the journey to find efficient coating agents, most of the studies have been focused more on the effect of the coating agent architecture rather than on the role the physicochemical properties of the nanoparticle used as substrate...
April 8, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28384029/controlled-dual-delivery-of-angiogenin-and-curcumin-by-electrospun-nanofibers-for-skin-regeneration
#16
Yunfei Mo, Rui Guo, Yi Zhang, Wei Xue, Biao Cheng, Yuanming Zhang
In this study, we successfully fabricated a novel drug and plasmid DNA (pDNA) dual delivery system by electrospinning the dispersion composed of polyethyleneimine-carboxymethyl chitosan/pDNA-angiogenin (ANG) nanoparticles, curcumin (Cur), poly (D, L-lactic-co-glycolic acid) (PLGA), and cellulose nanocrystals (CNCs). In vitro release studies showed that the bioactivity of Cur and ANG was preserved in the nanofibers, and a sequential release pattern was achieved in which nearly 90% of the Cur was released in ca...
March 27, 2017: Tissue Engineering. Part A
https://www.readbyqxmd.com/read/28376362/incorporation-of-plla-micro-fillers-for-mechanical-reinforcement-of-calcium-phosphate-cement
#17
Antonio G B Castro, Alessandro Polini, Zohal Azami, Sander C G Leeuwenburgh, John A Jansen, Fang Yang, Jeroen J J P van den Beucken
Calcium phosphate cements (CPCs) are biocompatible, resorbable, injectable and osteoconductive. Those properties render such materials suitable for applications where bone repair and regeneration is required However, their brittle nature limits their application only to non-load-bearing applications. The incorporation of long polymeric fibers can improve the mechanical properties of CPCs, but aggregation is a major problem. Instead, short polymeric fillers can be easily dispersed in the cement matrix, but their reinforcing effect has not been studied yet...
March 28, 2017: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/28361908/sustained-delivery-of-calcium-and-orthophosphate-ions-from-amorphous-calcium-phosphate-and-poly-l-lactic-acid-based-electrospinning-nanofibrous-scaffold
#18
Xufeng Niu, Zhongning Liu, Feng Tian, Siqian Chen, Lei Lei, Ting Jiang, Qingling Feng, Yubo Fan
The purpose of this study is to investigate electrospinning poly(L-lactic acid) (PLLA) nanofibrous scaffold with different contents of amorphous calcium phosphate (ACP), which is suitable for using in bone regeneration through sustained release of calcium and orthophosphate ions. Three groups of nanofibrous scaffolds, ACP-free PLLA, ACP-5 wt%/PLLA and ACP-10 wt%/PLLA, are developed and characterized by scanning electron microscopy and gel permeation chromatography. Calcium and phosphate colorimetric assay kits are used to test ions released from scaffold during hydrolytic degradation...
March 31, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28356731/co-delivery-nanoparticles-with-characteristics-of-intracellular-precision-release-drugs-for-overcoming-multidrug-resistance
#19
DanDan Zhang, Yan Yan Kong, Jia Hui Sun, Shao Jie Huo, Min Zhou, Yi Ling Gui, Xu Mu, Huan Chen, Shu Qin Yu, Qian Xu
Combination chemotherapy in clinical practice has been generally accepted as a feasible strategy for overcoming multidrug resistance (MDR). Here, we designed and successfully prepared a co-delivery system named S-D1@L-D2 NPs, where denoted some smaller nanoparticles (NPs) carrying a drug doxorubicin (DOX) were loaded into a larger NP containing another drug (vincristine [VCR]) via water-in-oil-in-water double-emulsion solvent diffusion-evaporation method. Chitosan-alginate nanoparticles carrying DOX (CS-ALG-DOX NPs) with a smaller diameter of about 20 nm formed S-D1 NPs; vitamin E D-α-tocopheryl polyethylene glycol 1000 succinate-modified poly(lactic-co-glycolic acid) nanoparticles carrying VCR (TPGS-PLGA-VCR NPs) with a larger diameter of about 200 nm constituted L-D2 NPs...
2017: International Journal of Nanomedicine
https://www.readbyqxmd.com/read/28345891/tailored-chemical-properties-of-4-arm-star-shaped-poly-d-l-lactide-as-cell-adhesive-three-dimensional-scaffolds
#20
Chelladurai Karthikeyan Balavigneswaran, Sanjeev Kumar Mahto, Bano Subia, Arumugam Prabhakar, Kheyanath Mitra, Vivek Rao, Munia Ganguli, Biswajit Ray, Pralay Maiti, Nira Misra
Biodegradable poly(lactic acid) (PLA) is widely used to fabricate 3D scaffolds for tissue regeneration. However, PLA lacks cell adhering functional moieties, which limit its successful application in tissue engineering. Herein, we have tailored the cell adhesive properties of star shaped poly(d,l-lactide) (ss-PDLLA) by grafting gelatin to their 4 arms. Grafting of gelatin on PDLLA backbone was confirmed by (1)H NMR and FTIR. The synthesized star shaped poly(d,l-lactide)-b-gelatin (ss-pLG) exhibited enhanced wettability and protein adsorption...
April 10, 2017: Bioconjugate Chemistry
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