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Abbasnezhad N, Zirak N, Champmartin S, Shirinbayan M, Bakir F. An Overview of In Vitro Drug Release Methods for Drug-Eluting Stents. Polymers (Basel) 2022; 14:2751. [PMID: 35808798 PMCID: PMC9269075 DOI: 10.3390/polym14132751] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2022] [Revised: 06/15/2022] [Accepted: 06/16/2022] [Indexed: 01/08/2023] Open
Abstract
The drug release profile of drug-eluting stents (DESs) is affected by a number of factors, including the formulation, design, and physicochemical properties of the utilized material. DES has been around for twenty years and despite its widespread clinical use, and efficacy in lowering the rate of target lesion restenosis, it still requires additional development to reduce side effects and provide long-term clinical stability. Unfortunately, for analyzing these implants, there is still no globally accepted in vitro test method. This is owing to the stent's complexity as well as the dynamic arterial compartments of the blood and vascular wall. The former is the source of numerous biological, chemical, and physical mechanisms that are more commonly observed in tissue, lumen, and DES. As a result, universalizing bio-relevant apparatus, suitable for liberation testing of such complex implants is difficult. This article aims to provide a comprehensive review of the methods used for in vitro release testing of DESs. Aspects related to the correlation of the release profiles in the cases of in vitro and in vivo are also addressed.
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Affiliation(s)
- Navideh Abbasnezhad
- Arts et Métiers Institute of Technology, CNAM, LIFSE, HESAM University, F-75013 Paris, France; (N.Z.); (S.C.)
- Arts et Métiers Institute of Technology, CNAM, PIMM, HESAM University, F-75013 Paris, France;
| | - Nader Zirak
- Arts et Métiers Institute of Technology, CNAM, LIFSE, HESAM University, F-75013 Paris, France; (N.Z.); (S.C.)
- Arts et Métiers Institute of Technology, CNAM, PIMM, HESAM University, F-75013 Paris, France;
| | - Stéphane Champmartin
- Arts et Métiers Institute of Technology, CNAM, LIFSE, HESAM University, F-75013 Paris, France; (N.Z.); (S.C.)
| | - Mohammadali Shirinbayan
- Arts et Métiers Institute of Technology, CNAM, PIMM, HESAM University, F-75013 Paris, France;
| | - Farid Bakir
- Arts et Métiers Institute of Technology, CNAM, LIFSE, HESAM University, F-75013 Paris, France; (N.Z.); (S.C.)
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2
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Lin EMJ, Lay CL, Subramanian GS, Tan WS, Leong SSJ, Moh LCH, Lim K. Control Release Coating for Urinary Catheters with Enhanced Released Profile for Sustained Antimicrobial Protection. ACS APPLIED MATERIALS & INTERFACES 2021; 13:59263-59274. [PMID: 34846837 DOI: 10.1021/acsami.1c17697] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Catheter-associated urinary tract infections (CAUTIs) are common and pose significant costs to healthcare systems. To date, this problem is largely unsolved as commercially available antimicrobial catheters are still lacking in functionality and performance. A prior study by Lim et al. ( Biotechnol. Bioeng. 2018, 115 (8), 2000-2012) reported the development of a novel anhydrous polycaprolactone (PCL) polymer formulation with controlled-release functionality for antimicrobial peptides. In this follow-up study, we developed an improved antimicrobial peptide (AMP)-impregnated poly(ethylene glycol) (PEG)-polycaprolactone (PCL) anhydrous polymer coating for enhanced sustained controlled-release functionality to provide catheters with effective antimicrobial properties. Varying the ratio of PEG and PEG-PCL copolymers resulted in polymers with different morphologies, consequently affecting the AMP release profiles. The optimal coating, formulated with 10% (w/w) PEG-PCL in PCL, achieved a controlled AMP release rate of 31.65 ± 6.85 μg/mL daily for up to 19 days, with a moderate initial burst release. Such profile is desired for antimicrobial coating as the initial burst release acts as a sterilizer to kill the bacteria present in the urinary tract upon insertion, and the subsequent linear release functions as a prophylaxis to deter opportunistic microbial infections. As a proof-of-concept application, our optimized coating was then applied to a commercial silicone catheter for further antibacterial tests. Preliminary results revealed that our coated catheters outperformed commercial silver-based antimicrobial catheters in terms of antimicrobial performance and sustainability, lasting for 4 days. Application of the controlled-release coating also aids in retarding biofilm formation, showing a lower extent of biofilm formation at the end of seven inoculation cycles.
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Affiliation(s)
- Esther Marie JieRong Lin
- Institute of Materials Research and Engineering, Agency for Science, Technology and Research, 2 Fusionopolis Way, 138634 Singapore
| | - Chee Leng Lay
- Institute of Materials Research and Engineering, Agency for Science, Technology and Research, 2 Fusionopolis Way, 138634 Singapore
| | - Gomathy Sandhya Subramanian
- Institute of Materials Research and Engineering, Agency for Science, Technology and Research, 2 Fusionopolis Way, 138634 Singapore
- Singapore Institute of Food and Biotechnology Innovation, Agency for Science, Technology and Research, 31 Biopolis Way, #01-02 Nanos, 138669 Singapore
| | - Wui Siew Tan
- Dornier Medtech Asia Pte Ltd., 2 Venture Drive, Vision Exchange, 608526 Singapore
| | | | - Lionel Chuan Hui Moh
- Institute of Materials Research and Engineering, Agency for Science, Technology and Research, 2 Fusionopolis Way, 138634 Singapore
| | - Kaiyang Lim
- ES-TA Technology Pte Ltd., 21 Jalan Mesin, 368819 Singapore
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3
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Abbasnezhad N, Shirinbayan M, Chabi F, Champmartin S, Tcharkhtchi A, Bakir F. Viscoelastic Behavior of Drug-Loaded Polyurethane. Polymers (Basel) 2021; 13:2608. [PMID: 34451148 PMCID: PMC8400544 DOI: 10.3390/polym13162608] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2021] [Revised: 07/30/2021] [Accepted: 08/03/2021] [Indexed: 02/07/2023] Open
Abstract
Drug-eluting stents are desirable platforms for local medicine delivery. However, the incorporation of drugs into polymers can influence the mechanical and physicochemical properties of said matrix, which is a topic that is still poorly understood. In fact, this is more noticeable since the apposition is most often accompanied by mechanical stresses on the polymer coating, which can induce therapeutic failure that can result in death. It is therefore necessary to better understand their behavior by examining their properties in conditions such as those in living beings. We studied polyurethane drug carriers made in-house. Diclofenac epolamine was chosen as a model hydrophilic medicine. We used thermal measurements (DMTA) and tensile tests. The aim was to establish the influence of the loading and release of the drug on the physicochemical properties of this polymer in the presence of a stagnant or circulating fluid medium, phosphate-buffered saline (PBS). For the two PU/drug loadings studied, the effect of the initial drug load was more marked. The free volume fraction and the number of pores in the samples increased with the increasing percent of the drug and with release time. The kinetic profiles were accelerated with the loading ratio and with the presence of flow. Young's modulus and ultimate stress were not significantly influenced by the release time. A relevant relationship between the tensile properties and the viscoelastic behavior of the samples was developed. Our results have implications for optimizing the performance of drug coatings for stents.
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Affiliation(s)
- Navideh Abbasnezhad
- Arts et Metiers Institute of Technology, CNAM, LIFSE, HESAM University, F-75013 Paris, France
- Arts et Metiers Institute of Technology, CNAM, PIMM, HESAM University, F-75013 Paris, France
| | - Mohammadali Shirinbayan
- Arts et Metiers Institute of Technology, CNAM, LIFSE, HESAM University, F-75013 Paris, France
- Arts et Metiers Institute of Technology, CNAM, PIMM, HESAM University, F-75013 Paris, France
| | - Fatiha Chabi
- Arts et Metiers Institute of Technology, CNAM, LIFSE, HESAM University, F-75013 Paris, France
| | - Stephane Champmartin
- Arts et Metiers Institute of Technology, CNAM, LIFSE, HESAM University, F-75013 Paris, France
| | - Abbas Tcharkhtchi
- Arts et Metiers Institute of Technology, CNAM, PIMM, HESAM University, F-75013 Paris, France
| | - Farid Bakir
- Arts et Metiers Institute of Technology, CNAM, LIFSE, HESAM University, F-75013 Paris, France
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4
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Abbasnezhad N, Zirak N, Shirinbayan M, Tcharkhtchi A, Bakir F. On the importance of physical and mechanical properties of PLGA films during drug release. J Drug Deliv Sci Technol 2021. [DOI: 10.1016/j.jddst.2021.102446] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
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5
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Heparin-Tagged PLA-PEG Copolymer-Encapsulated Biochanin A-Loaded (Mg/Al) LDH Nanoparticles Recommended for Non-Thrombogenic and Anti-Proliferative Stent Coating. Int J Mol Sci 2021; 22:ijms22115433. [PMID: 34063962 PMCID: PMC8196732 DOI: 10.3390/ijms22115433] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2021] [Revised: 04/26/2021] [Accepted: 05/17/2021] [Indexed: 12/29/2022] Open
Abstract
Drug-eluting stents have been widely implanted to prevent neointimal hyperplasia associated with bare metal stents. Conventional polymers and anti-proliferative drugs suffer from stent thrombosis due to the non-selective nature of the drugs and hypersensitivity to polymer degradation products. Alternatively, various herbal anti-proliferative agents are sought, of which biochanin A (an isoflavone phytoestrogen) was known to have anti-proliferative and vasculoprotective action. PLA-PEG diblock copolymer was tagged with heparin, whose degradation releases heparin locally and prevents thrombosis. To get a controlled drug release, biochanin A was loaded in layered double hydroxide nanoparticles (LDH), which are further encapsulated in a heparin-tagged PLA-PEG copolymer. LDH nanoparticles are synthesized by a co-precipitation process; in situ as well as ex situ loading of biochanin A were done. PLA-PEG-heparin copolymer was synthesized by esterification reaction, and the drug-loaded nanoparticles are coated. The formulation was characterized by FTIR, XRD, DSC, DLS, and TEM. In vitro drug release studies, protein adhesion, wettability, hemocompatibility, and degradation studies were performed. The drug release was modeled by mathematical models to further emphasize the mechanism of drug release. The developed drug-eluting stent coating is non-thrombogenic, and it offers close to zero-order release for 40 days, with complete polymer degradation in 14 weeks.
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Arbeiter D, Reske T, Teske M, Bajer D, Senz V, Schmitz KP, Grabow N, Oschatz S. Influence of Drug Incorporation on the Physico-Chemical Properties of Poly(l-Lactide) Implant Coating Matrices-A Systematic Study. Polymers (Basel) 2021; 13:292. [PMID: 33477626 PMCID: PMC7831498 DOI: 10.3390/polym13020292] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2020] [Revised: 01/12/2021] [Accepted: 01/13/2021] [Indexed: 12/15/2022] Open
Abstract
Local drug delivery has become indispensable in biomedical engineering with stents being ideal carrier platforms. While local drug release is superior to systemic administration in many fields, the incorporation of drugs into polymers may influence the physico-chemical properties of said matrix. This is of particular relevance as minimally invasive implantation is frequently accompanied by mechanical stresses on the implant and coating. Thus, drug incorporation into polymers may result in a susceptibility to potentially life-threatening implant failure. We investigated spray-coated poly-l-lactide (PLLA)/drug blends using thermal measurements (DSC) and tensile tests to determine the influence of selected drugs, namely sirolimus, paclitaxel, dexamethasone, and cyclosporine A, on the physico-chemical properties of the polymer. For all drugs and PLLA/drug ratios, an increase in tensile strength was observed. As for sirolimus and dexamethasone, PLLA/drug mixed phase systems were identified by shifted drug melting peaks at 200 °C and 240 °C, respectively, whereas paclitaxel and dexamethasone led to cold crystallization. Cyclosporine A did not affect matrix thermal properties. Altogether, our data provide a contribution towards an understanding of the complex interaction between PLLA and different drugs. Our results hold implications regarding the necessity of target-oriented thermal treatment to ensure the shelf life and performance of stent coatings.
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Affiliation(s)
- Daniela Arbeiter
- Institute for Biomedical Engineering, Rostock University Medical Center, Friedrich-Barnewitz-Straße 4, 18119 Rostock, Germany; (M.T.); (D.B.); (V.S.); (K.-P.S.); (N.G.); (S.O.)
| | - Thomas Reske
- Institute for Implant Technology and Biomaterials e.V., Friedrich-Barnewitz-Straße 4, 18119 Rostock, Germany;
| | - Michael Teske
- Institute for Biomedical Engineering, Rostock University Medical Center, Friedrich-Barnewitz-Straße 4, 18119 Rostock, Germany; (M.T.); (D.B.); (V.S.); (K.-P.S.); (N.G.); (S.O.)
| | - Dalibor Bajer
- Institute for Biomedical Engineering, Rostock University Medical Center, Friedrich-Barnewitz-Straße 4, 18119 Rostock, Germany; (M.T.); (D.B.); (V.S.); (K.-P.S.); (N.G.); (S.O.)
| | - Volkmar Senz
- Institute for Biomedical Engineering, Rostock University Medical Center, Friedrich-Barnewitz-Straße 4, 18119 Rostock, Germany; (M.T.); (D.B.); (V.S.); (K.-P.S.); (N.G.); (S.O.)
| | - Klaus-Peter Schmitz
- Institute for Biomedical Engineering, Rostock University Medical Center, Friedrich-Barnewitz-Straße 4, 18119 Rostock, Germany; (M.T.); (D.B.); (V.S.); (K.-P.S.); (N.G.); (S.O.)
- Institute for Implant Technology and Biomaterials e.V., Friedrich-Barnewitz-Straße 4, 18119 Rostock, Germany;
| | - Niels Grabow
- Institute for Biomedical Engineering, Rostock University Medical Center, Friedrich-Barnewitz-Straße 4, 18119 Rostock, Germany; (M.T.); (D.B.); (V.S.); (K.-P.S.); (N.G.); (S.O.)
| | - Stefan Oschatz
- Institute for Biomedical Engineering, Rostock University Medical Center, Friedrich-Barnewitz-Straße 4, 18119 Rostock, Germany; (M.T.); (D.B.); (V.S.); (K.-P.S.); (N.G.); (S.O.)
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7
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Sarmadi M, Behrens AM, McHugh KJ, Contreras HTM, Tochka ZL, Lu X, Langer R, Jaklenec A. Modeling, design, and machine learning-based framework for optimal injectability of microparticle-based drug formulations. SCIENCE ADVANCES 2020; 6:eabb6594. [PMID: 32923598 PMCID: PMC7455482 DOI: 10.1126/sciadv.abb6594] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/09/2020] [Accepted: 05/22/2020] [Indexed: 05/14/2023]
Abstract
Inefficient injection of microparticles through conventional hypodermic needles can impose serious challenges on clinical translation of biopharmaceutical drugs and microparticle-based drug formulations. This study aims to determine the important factors affecting microparticle injectability and establish a predictive framework using computational fluid dynamics, design of experiments, and machine learning. A numerical multiphysics model was developed to examine microparticle flow and needle blockage in a syringe-needle system. Using experimental data, a simple empirical mathematical model was introduced. Results from injection experiments were subsequently incorporated into an artificial neural network to establish a predictive framework for injectability. Last, simulations and experimental results contributed to the design of a syringe that maximizes injectability in vitro and in vivo. The custom injection system enabled a sixfold increase in injectability of large microparticles compared to a commercial syringe. This study highlights the importance of the proposed framework for optimal injection of microparticle-based drugs by parenteral routes.
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Affiliation(s)
- Morteza Sarmadi
- Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
- David H. Koch Institute for Integrative Cancer Research, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
- Harvard-MIT Division of Health Sciences and Technology, Institute for Medical Engineering and Science, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
| | - Adam M. Behrens
- David H. Koch Institute for Integrative Cancer Research, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
| | - Kevin J. McHugh
- David H. Koch Institute for Integrative Cancer Research, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
| | - Hannah T. M. Contreras
- David H. Koch Institute for Integrative Cancer Research, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
| | - Zachary L. Tochka
- David H. Koch Institute for Integrative Cancer Research, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
| | - Xueguang Lu
- David H. Koch Institute for Integrative Cancer Research, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
| | - Robert Langer
- Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
- David H. Koch Institute for Integrative Cancer Research, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
- Harvard-MIT Division of Health Sciences and Technology, Institute for Medical Engineering and Science, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
| | - Ana Jaklenec
- David H. Koch Institute for Integrative Cancer Research, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
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8
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Pannuzzo M, Horta BAC, La Rosa C, Decuzzi P. Predicting the Miscibility and Rigidity of Poly(lactic- co-glycolic acid)/Polyethylene Glycol Blends via Molecular Dynamics Simulations. Macromolecules 2020; 53:3643-3654. [PMID: 32831403 PMCID: PMC7428138 DOI: 10.1021/acs.macromol.0c00110] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2020] [Revised: 04/07/2020] [Indexed: 11/30/2022]
Abstract
![]()
The
addition of polyethylene glycol (PEG) chains to poly(lactic-co-glycolic acid) (PLGA) matrices is extensively used to
modulate the biodegradation, drug loading and release, mechanical
properties, and chemical stability of the original system. Multiple
parameters, including the molecular weight, relative concentration,
polarity, and solubility, affect the physicochemical properties of
the polymer blend. Here, molecular dynamics simulations with the united-atom
2016H66 force field are used to model the behavior of PLGA and PEG chains and thus predict the overall
physicochemical features of the resulting blend. First, the model
accuracy is validated against fundamental properties of pure PLGA
and PEG samples. In agreement with previous experimental and theoretical
observations, the PLGA solubility results to be higher in acetonitrile
than in water, with Flory parameters νACN = 0.63
± 0.01 and νW = 0.21 ± 0.02, and the Young’s
modulus of PLGA and PEG equal to Y = 2.0 ± 0.43
and 0.32 ± 0.34 GPa, respectively. Next, four PEG/PLGA blending
regimes are identified by varying the relative concentrations and
molecular weights of the individual polymers. The computational results
demonstrate that at low PEG concentrations (<8% w/w), homogeneous
blends are generated for both low and high PEG molecular weights.
In contrast, at comparable PEG and PLGA concentrations (∼50%
w/w), short PEG chains are only partially miscible whereas long PEG
chains segregate within the PLGA matrix. This behavior has been confirmed
experimentally via differential scanning calorimetry and is in agreement
with previous observations. Finally, the computed Young’s modulus
of PLGA/PEG blends is observed to decrease with the PEG content returning
the lowest values for the partial and fully segregated regimens (Y ≈ 1.3 GPa). This work proposes a computational
scheme for predicting the physicochemical properties of PLGA/PEG blends
paving the way toward the rational design of polymer mixtures for
biomedical applications.
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Affiliation(s)
- Martina Pannuzzo
- Laboratory of Nanotechnology for Precision Medicine, Fondazione Istituto Italiano di Tecnologia, Via Morego 30, Genoa 16163, Italy
| | - Bruno A C Horta
- Instituto de Química, Universidade Federal do Rio de Janeiro, Rio de Janeiro 21941-909, Brazil
| | - Carmelo La Rosa
- Department of Chemical Sciences, University of Catania, Viale A. Doria 6, Catania 95125, Italy
| | - Paolo Decuzzi
- Laboratory of Nanotechnology for Precision Medicine, Fondazione Istituto Italiano di Tecnologia, Via Morego 30, Genoa 16163, Italy
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Polylactide/polyethylene glycol fibrous mats for local paclitaxel delivery: comparison of drug release into liquid medium and to HEMA-based hydrogel model. MONATSHEFTE FUR CHEMIE 2019. [DOI: 10.1007/s00706-019-02469-5] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
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10
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Tuning Drug Release via Twin Screw Extrusion in Polyester Films. J Pharm Sci 2019; 108:2430-2437. [DOI: 10.1016/j.xphs.2019.02.024] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2019] [Revised: 02/24/2019] [Accepted: 02/27/2019] [Indexed: 11/17/2022]
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Baranes‐Zeevi M, Goder D, Zilberman M. Novel drug‐eluting soy‐protein structures for wound healing applications. POLYM ADVAN TECHNOL 2019. [DOI: 10.1002/pat.4673] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Affiliation(s)
- Maya Baranes‐Zeevi
- Department of Biomedical Engineering, Faculty of EngineeringTel‐Aviv University Tel‐Aviv Israel
| | - Daniella Goder
- Department of Materials Science and Engineering, Faculty of EngineeringTel‐Aviv University Tel‐Aviv Israel
| | - Meital Zilberman
- Department of Biomedical Engineering, Faculty of EngineeringTel‐Aviv University Tel‐Aviv Israel
- Department of Materials Science and Engineering, Faculty of EngineeringTel‐Aviv University Tel‐Aviv Israel
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12
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Hobzova R, Hampejsova Z, Cerna T, Hrabeta J, Venclikova K, Jedelska J, Bakowsky U, Bosakova Z, Lhotka M, Vaculin S, Franek M, Steinhart M, Kovarova J, Michalek J, Sirc J. Poly(d,l-lactide)/polyethylene glycol micro/nanofiber mats as paclitaxel-eluting carriers: preparation and characterization of fibers, in vitro drug release, antiangiogenic activity and tumor recurrence prevention. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2019; 98:982-993. [DOI: 10.1016/j.msec.2019.01.046] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/23/2018] [Revised: 12/11/2018] [Accepted: 01/10/2019] [Indexed: 12/16/2022]
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13
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Moroishi H, Sonotaki S, Murakami Y. PLA- and PLA/PLGA-Emulsion Composite Biomaterial Sheets for the Controllable Sustained Release of Hydrophilic Compounds. MATERIALS 2018; 11:ma11122588. [PMID: 30572611 PMCID: PMC6316162 DOI: 10.3390/ma11122588] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/26/2018] [Revised: 12/14/2018] [Accepted: 12/17/2018] [Indexed: 12/29/2022]
Abstract
In the present study, by spin-coating a solution containing w/o (water-in-oil) emulsions and hydrophobic polymers, we obtained sheets possessing uniformly dispersed w/o emulsions. We performed release experiments for more than 100 days and clarified the effects of the number of layers, the sheet-forming polymers (polylactide (PLA), poly(lactic-co-glycolic acid (PLGA)), the ratio of organic solvent to water, and the composition of block copolymers on the release properties of the sheets. For a variety of sheets, we successfully achieved the sustained release of compounds from the sheets for 100–150 days. The sustained-release of compounds occurred because the compounds had to diffuse into polymer networks after their release from the emulsions. Interestingly, we observed an inflection point in the release profiles at around 50 days; that is, the sheet exhibited a “two-step” release behavior. The results obtained in the present study provide strong evidence for the future possibility of the time-programmed release of multiple compounds from sheets.
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Affiliation(s)
- Hitomi Moroishi
- Department of Organic and Polymer Materials Chemistry, Tokyo University of Agriculture and Technology, 2-24-16 Naka-cho, Koganei-shi, Tokyo 184-8588, Japan.
| | - Seiichi Sonotaki
- Department of Organic and Polymer Materials Chemistry, Tokyo University of Agriculture and Technology, 2-24-16 Naka-cho, Koganei-shi, Tokyo 184-8588, Japan.
| | - Yoshihiko Murakami
- Department of Organic and Polymer Materials Chemistry, Tokyo University of Agriculture and Technology, 2-24-16 Naka-cho, Koganei-shi, Tokyo 184-8588, Japan.
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14
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Dual-Layer Coated Drug-Eluting Stents with Improved Degradation Morphology and Controlled Drug Release. Macromol Res 2018. [DOI: 10.1007/s13233-018-6110-4] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
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15
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Davoodi P, Lee LY, Xu Q, Sunil V, Sun Y, Soh S, Wang CH. Drug delivery systems for programmed and on-demand release. Adv Drug Deliv Rev 2018; 132:104-138. [PMID: 30415656 DOI: 10.1016/j.addr.2018.07.002] [Citation(s) in RCA: 185] [Impact Index Per Article: 30.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2018] [Revised: 05/25/2018] [Accepted: 07/02/2018] [Indexed: 01/06/2023]
Abstract
With the advancement in medical science and understanding the importance of biodistribution and pharmacokinetics of therapeutic agents, modern drug delivery research strives to utilize novel materials and fabrication technologies for the preparation of robust drug delivery systems to combat acute and chronic diseases. Compared to traditional drug carriers, which could only control the release of the agents in a monotonic manner, the new drug carriers are able to provide a precise control over the release time and the quantity of drug introduced into the patient's body. To achieve this goal, scientists have introduced "programmed" and "on-demand" approaches. The former provides delivery systems with a sophisticated architecture to precisely tune the release rate for a definite time period, while the latter includes systems directly controlled by an operator/practitioner, perhaps with a remote device triggering/affecting the implanted or injected drug carrier. Ideally, such devices can determine flexible release pattern and intensify the efficacy of a therapy via controlling time, duration, dosage, and location of drug release in a predictable, repeatable, and reliable manner. This review sheds light on the past and current techniques available for fabricating and remotely controlling drug delivery systems and addresses the application of new technologies (e.g. 3D printing) in this field.
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16
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Plch J, Venclikova K, Janouskova O, Hrabeta J, Eckschlager T, Kopeckova K, Hampejsova Z, Bosakova Z, Sirc J, Hobzova R. Paclitaxel-Loaded Polylactide/Polyethylene Glycol Fibers with Long-Term Antitumor Activity as a Potential Drug Carrier for Local Chemotherapy. Macromol Biosci 2018; 18:e1800011. [DOI: 10.1002/mabi.201800011] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2018] [Revised: 03/01/2018] [Indexed: 12/12/2022]
Affiliation(s)
- Johana Plch
- Department of Pediatric Hematology and Oncology; 2nd Medical Faculty; Charles University and Motol University Hospital; V uvalu 84 150 06 Prague 5 Czech Republic
| | - Kristyna Venclikova
- Institute of Macromolecular Chemistry; Academy of Sciences; Heyrovsky Sq. 2 162 06 Prague 6 Czech Republic
| | - Olga Janouskova
- Institute of Macromolecular Chemistry; Academy of Sciences; Heyrovsky Sq. 2 162 06 Prague 6 Czech Republic
| | - Jan Hrabeta
- Department of Pediatric Hematology and Oncology; 2nd Medical Faculty; Charles University and Motol University Hospital; V uvalu 84 150 06 Prague 5 Czech Republic
| | - Tomas Eckschlager
- Department of Pediatric Hematology and Oncology; 2nd Medical Faculty; Charles University and Motol University Hospital; V uvalu 84 150 06 Prague 5 Czech Republic
| | - Katerina Kopeckova
- Department of Oncology; 2nd Medical Faculty; Charles University and Motol University Hospital; V uvalu 84 150 06 Prague 5 Czech Republic
| | - Zuzana Hampejsova
- Department of Analytical Chemistry; Faculty of Science; Charles University; Hlavova 8 128 43 Prague 2 Czech Republic
| | - Zuzana Bosakova
- Department of Analytical Chemistry; Faculty of Science; Charles University; Hlavova 8 128 43 Prague 2 Czech Republic
| | - Jakub Sirc
- Institute of Macromolecular Chemistry; Academy of Sciences; Heyrovsky Sq. 2 162 06 Prague 6 Czech Republic
| | - Radka Hobzova
- Institute of Macromolecular Chemistry; Academy of Sciences; Heyrovsky Sq. 2 162 06 Prague 6 Czech Republic
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PLGA-based monolithic filaments prepared by hot-melt extrusion: In-vitro comparative study. ANNALES PHARMACEUTIQUES FRANÇAISES 2017; 76:97-106. [PMID: 29145995 DOI: 10.1016/j.pharma.2017.09.002] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2017] [Revised: 08/20/2017] [Accepted: 09/17/2017] [Indexed: 01/09/2023]
Abstract
To avoid frequent drug administration, PLGA-based monolithic filament-shaped implants were prepared. In this study, the effect of different formulation variables was studied, namely: type of PLGA (PLGA 502 and PLGA 503), type of drug (the lipophilic Prednisolone acetate, PA and the hydrophilic Propranolol Hydrochloride, PH) and drug loading (10 and 30% w/w). PLGA 503-based implants showed a lower water uptake, lower mass loss and erosion, slower drug release, and better mechanical properties and elasticity (P<0.05) compared to the corresponding PLGA 502-based implants. PH-loaded implants showed a faster swelling and degradation as well as drug release (P<0.05) compared to PA-loaded implants; the former attained almost complete drug release after about 18 days, while the latter attained it after about 30 days. All the implants followed a zero-order kinetic pattern suitable for a controlled drug release. Characterization was done using SEM and DSC. This study proved the potential tailoring of the properties of PLGA-implants, prepared by hot-melt extrusion (HME), based on some formulation variables.
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Jang BN, Kang SN, Eom TG, Han DK, An SH, Noh I, Kum CH. Controlled release of paclitaxel using a drug-eluting stent through modulation of the size of drug particles in vivo. J Biomed Mater Res B Appl Biomater 2017; 106:2275-2283. [PMID: 29087014 DOI: 10.1002/jbm.b.34035] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2017] [Revised: 09/26/2017] [Accepted: 10/13/2017] [Indexed: 11/09/2022]
Abstract
Drug-eluting stents (DESs) are generally used in percutaneous coronary intervention. Paclitaxel (PTX) is widely used in DESs to suppress neointima, which causes restenosis. However, the PTX release profile is slow owing to its hydrophobic properties, resulting in negative effects on re-endothelialization in vessels. In this study, we assessed the effects of the controlled release of PTX particles of specific sizes on in-stent restenosis (ISR). PTX particle sizes were controlled by adjusting the evaporating temperature of the solvent from 25 to 80°C during ultrasonic coating, and DESs were prepared. The properties of prepared films and DESs were analyzed, and cell viability was assessed in vitro and in vivo. Poly(lactic-co-glycolic acid) (PLGA)/PTX500-loaded stents showed the most rapid release for 58 days, and smaller drug particles exhibited lower PTX release rates. In vivo, PLGA/PTX50-, PLGA/PTX250-, and PLGA/PTX500-loaded stents showed good efficacy for alleviating ISR as compared with bare metal stents and PLGA/PTX5-loaded stents. However, PLGA/PTX250- and PLGA/PTX500-loaded stents exhibited strut exposure and reduced recovery of the vascular compared with PLGA/PTX50-loaded stents. PTX drug particles of approximately 50 nm were most effective in vivo, and the control of particle size is a promising strategy for improving the performance of PTX-eluting stents. © 2017 Wiley Periodicals, Inc. J Biomed Mater Res Part B: Appl Biomater, 106B: 2275-2283, 2018.
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Affiliation(s)
- Bu Nam Jang
- Stent Research and Development Center, Osstemcardiotec, Seoul, Korea.,Convergence Program of Biomedical Engineering & Biomaterials, Seoul National University of Science and Technology, Seoul, Korea
| | - Sung Nam Kang
- Stent Research and Development Center, Osstemcardiotec, Seoul, Korea
| | - Tae-Gwan Eom
- Stent Research and Development Center, Osstemcardiotec, Seoul, Korea
| | - Dong Keun Han
- Center for Biomaterials, Biomedical Research Institute, Korea Institute of Science and Technology, Seoul, Korea
| | - Sang-Hyun An
- Laboratory Animal Center, Daegu-Gyeongbuk Medical Innovation Foundation, Daegu, Korea
| | - Insup Noh
- Convergence Program of Biomedical Engineering & Biomaterials, Seoul National University of Science and Technology, Seoul, Korea
| | - Chang Hun Kum
- Stent Research and Development Center, Osstemcardiotec, Seoul, Korea
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Hamoudi-Ben Yelles M, Tran Tan V, Danede F, Willart J, Siepmann J. PLGA implants: How Poloxamer/PEO addition slows down or accelerates polymer degradation and drug release. J Control Release 2017; 253:19-29. [DOI: 10.1016/j.jconrel.2017.03.009] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2017] [Revised: 03/03/2017] [Accepted: 03/04/2017] [Indexed: 02/07/2023]
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20
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Self-assembled photoadditives in polyester films allow stop and go chemical release. Acta Biomater 2017; 54:186-200. [PMID: 28315815 DOI: 10.1016/j.actbio.2017.03.021] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2016] [Revised: 03/04/2017] [Accepted: 03/13/2017] [Indexed: 12/16/2022]
Abstract
Near-infrared (NIR) triggered chemical delivery allows on-demand release with the advantage of external tissue stimulation. Bioresorbable polyester poly-l-lactic acid (PLLA) was compounded with photoadditives of neat zinc oxide (ZnO) nanoparticles and 980→365nm LiYF4:Tm3+, Yb3+ upconverting nanoparticles (UCNP). Subsequently, neat ZnO and UCNP blended PLLA films of sub-50μm thickness were knife casted with a hydrophobic small molecule drug mimic, fluorescein diacetate. The PLLA films displayed a 500 times increase in fluorescein diacetate release from the 50mW NIR irradiated PLLA/photoadditive film compared to non-irradiated PLLA control films. Larger ratios of UCNP/neat ZnO increased photocatalysis efficiency at low NIR duty cycles. The synergistic increase results from the self-assembled photoadditives of neat zinc oxide and upconverting nanoparticles (UCNPs), as seen in transmission electron microscopy. Colloidal ZnO, which does not self-assemble with UCNPs, had less than half the release kinetics of the self-assembled PLLA films under similar conditions, advocating Förster resonance energy transfer as the mechanism responsible for the synergistic increase. Alternative to intensity modulation, pulse width modulation (duty cycles from 0.1 to 1) of the low intensity 50mW NIR laser diode allowed tailorable release rates from 0.01 to 1.4% per day. With the low intensity NIR activation, tailorable release rates, and favorable biocompatibility of the constituents, implanted PLLA photoadditive thin films could allow feedback mediated chemical delivery. STATEMENT OF SIGNIFICANCE Upconverting nanoparticles and zinc oxide nanorods were found to spontaneously self-assemble into submicron particles in organic solvents. Exposure of the submicron particles to near-infrared light allows stop and go chemical release from biocompatible polymers. Sample preparation of thin films is done with ease through physical mixing of the photoadditives followed by air-dried knife casting. A colloidal ZnO variant that does not self-assemble with upconverting nanoparticles had slower chemical release, suggesting that synergistic chemical release is brought upon by highly efficient energy transfer mechanisms when the nanoparticles are less than 10nm apart. Never before seen composite particles of UCNP/ZnO are displayed, which shows the close interaction of the photoadditives within the polymer matrix.
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Sirc J, Hampejsova Z, Trnovska J, Kozlik P, Hrib J, Hobzova R, Zajicova A, Holan V, Bosakova Z. Cyclosporine A Loaded Electrospun Poly(D,L-Lactic Acid)/Poly(Ethylene Glycol) Nanofibers: Drug Carriers Utilizable in Local Immunosuppression. Pharm Res 2017; 34:1391-1401. [PMID: 28405914 DOI: 10.1007/s11095-017-2155-x] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2016] [Accepted: 03/31/2017] [Indexed: 02/07/2023]
Abstract
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. A newly developed and validated LC-MS/MS method was utilized to quantify the amount of released CsA from the carriers. In vitro cell experiments were used to evaluate biological activity. RESULTS Nanofibers containing 15 wt% of PEG showed improved drug release characteristics; significantly higher release rates were achieved in initial part of experiment (24 h). The highest released doses of CsA were obtained from the nanofibers with PEG of the lowest MW (6 kDa). In vitro experiments on ConA-stimulated spleen cells revealed the biological activity of the released CsA for the whole study period of 144 h and nanofibers containing PEG with the lowest MW exhibited the highest impact (inhibition). CONCLUSIONS The addition of PEG of a particular MW enables to control CsA release from PLA nanofibrous carriers. The biological activity of CsA-loaded PLA nanofibers with PEG persists even after 144 h of previous extraction. Prepared materials are promising for local immunosuppression in various medical applications.
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Affiliation(s)
- Jakub Sirc
- Department of Polymer Networks and Gels, Institute of Macromolecular Chemistry, Czech Academy of Sciences, Heyrovsky Sq. 2, 162 06, Prague 6, Czech Republic
| | - Zuzana Hampejsova
- Department of Analytical Chemistry, Faculty of Science, Charles University, Hlavova 8, 128 43, Prague 2, Czech Republic
| | - Jana Trnovska
- Department of Analytical Chemistry, Faculty of Science, Charles University, Hlavova 8, 128 43, Prague 2, Czech Republic
| | - Petr Kozlik
- Department of Analytical Chemistry, Faculty of Science, Charles University, Hlavova 8, 128 43, Prague 2, Czech Republic
| | - Jakub Hrib
- Department of Polymer Networks and Gels, Institute of Macromolecular Chemistry, Czech Academy of Sciences, Heyrovsky Sq. 2, 162 06, Prague 6, Czech Republic
| | - Radka Hobzova
- Department of Polymer Networks and Gels, Institute of Macromolecular Chemistry, Czech Academy of Sciences, Heyrovsky Sq. 2, 162 06, Prague 6, Czech Republic
| | - Alena Zajicova
- Department of Transplantation Immunology, Institute of Experimental Medicine, Czech Academy of Sciences, Videnska 1083, 142 20, Prague 4, Czech Republic
| | - Vladimir Holan
- Department of Transplantation Immunology, Institute of Experimental Medicine, Czech Academy of Sciences, Videnska 1083, 142 20, Prague 4, Czech Republic
| | - Zuzana Bosakova
- Department of Analytical Chemistry, Faculty of Science, Charles University, Hlavova 8, 128 43, Prague 2, Czech Republic.
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Anzai R, Takami T, Uchida Y, Murakami Y. Poly(ε-caprolactone) (PCL) hybrid sheets containing polymeric micelles: Effects of inner structures on the material properties of the sheets. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2017; 72:325-331. [PMID: 28024593 DOI: 10.1016/j.msec.2016.11.090] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/05/2016] [Revised: 11/08/2016] [Accepted: 11/23/2016] [Indexed: 11/25/2022]
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Stefanowicz Z, Sobczak M, Piętniewicz A, Kołodziejski W. Macromolecular conjugates of paclitaxel: Synthesis, characterization, andIn Vitropaclitaxel release studies based on HPLC validated method. ACTA CHROMATOGR 2016. [DOI: 10.1556/achrom.28.2016.1.8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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24
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Behrens AM, Lee NG, Casey BJ, Srinivasan P, Sikorski MJ, Daristotle JL, Sandler AD, Kofinas P. Biodegradable-Polymer-Blend-Based Surgical Sealant with Body-Temperature-Mediated Adhesion. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2015; 27:8056-61. [PMID: 26554545 PMCID: PMC4961426 DOI: 10.1002/adma.201503691] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/30/2015] [Revised: 09/30/2015] [Indexed: 05/20/2023]
Abstract
The development of practical and efficient surgical sealants has the propensity to improve operational outcomes. A biodegradable polymer blend is fabricated as a nonwoven fiber mat in situ. After direct deposition onto the tissue of interest, the material transitions from a fiber mat to a film. This transition promotes polymer-substrate interfacial interactions leading to improved adhesion and surgical sealant performance.
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Affiliation(s)
- Adam M. Behrens
- Fischell Department of Bioengineering, 2330 Jeong H. Kim Engineering Building, University of Maryland, College Park, MD, USA
| | - Nora G. Lee
- Sheikh Zayed Institute for Pediatric Surgical Innovation, Children’s National Medical Center, 111 Michigan Avenue, NW Washington, DC, USA
| | - Brendan J. Casey
- Office of Medical Products and Tobacco, Center for Devices and Radiological Health, Office of Science and Engineering Laboratories, Division of Biology, Chemistry and Materials Science, US Food and Drug Administration, 10903 New Hampshire Avenue, Silver Spring, MD, USA
| | - Priya Srinivasan
- Sheikh Zayed Institute for Pediatric Surgical Innovation, Children’s National Medical Center, 111 Michigan Avenue, NW Washington, DC, USA
| | - Michael J. Sikorski
- Fischell Department of Bioengineering, 2330 Jeong H. Kim Engineering Building, University of Maryland, College Park, MD, USA
| | - John L. Daristotle
- Fischell Department of Bioengineering, 2330 Jeong H. Kim Engineering Building, University of Maryland, College Park, MD, USA
| | - Anthony D. Sandler
- Sheikh Zayed Institute for Pediatric Surgical Innovation, Children’s National Medical Center, 111 Michigan Avenue, NW Washington, DC, USA
| | - Peter Kofinas
- Fischell Department of Bioengineering, 2330 Jeong H. Kim Engineering Building, University of Maryland, College Park, MD, USA
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25
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Toledo LDASD, Bavato MI, Rosseto HC, Cortesi R, Bruschi ML. Pharmaceutical films made from the waste material from the preparation of propolis extracts: development and characterization. BRAZ J PHARM SCI 2015. [DOI: 10.1590/s1984-82502015000400011] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
abstract This study investigated the development and characterized the physicochemical properties of films obtained from by-products (BP) from the preparation of propolis extracts. Films were produced in the presence and absence of a polymeric adjuvant (gelatin or ethylcellulose) and propylene glycol by a solvent casting method. Density, surface topography by scanning electron microscopy, mechanical properties (folding endurance, tensile strength and percentage elongation), water vapour permeability (WVP), moisture uptake capacity, thermogravimetry, differential scanning calorimetry and Fourier transform infrared spectroscopy (FTIR) were determined. The films were a transparent, light greenish-yellow colour, with a uniform surface, and were flexible and easy to handle. The thickness and density of the preparations indicated that the compounds were homogeneously dispersed throughout the film. Mechanical properties were influenced by the film composition; films containing gelatin were more resistant to stress, while those containing ethylcellulose were more flexible. Increasing the adjuvant concentration decreased the elasticity and the rupture resistance, but increased the moisture uptake capacity and WVP of the formulations. BP was thermally stable as were the films. FTIR tests suggested interactions between BP and the adjuvants. This work could contribute to the utilization of BP to prepare films for food and pharmaceutical uses
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26
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Hrib J, Sirc J, Hobzova R, Hampejsova Z, Bosakova Z, Munzarova M, Michalek J. Nanofibers for drug delivery - incorporation and release of model molecules, influence of molecular weight and polymer structure. BEILSTEIN JOURNAL OF NANOTECHNOLOGY 2015; 6:1939-45. [PMID: 26665065 PMCID: PMC4660903 DOI: 10.3762/bjnano.6.198] [Citation(s) in RCA: 54] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/07/2015] [Accepted: 09/14/2015] [Indexed: 05/23/2023]
Abstract
Nanofibers were prepared from polycaprolactone, polylactide and polyvinyl alcohol using Nanospider(TM) technology. Polyethylene glycols with molecular weights of 2 000, 6 000, 10 000 and 20 000 g/mol, which can be used to moderate the release profile of incorporated pharmacologically active compounds, served as model molecules. They were terminated by aromatic isocyanate and incorporated into the nanofibers. The release of these molecules into an aqueous environment was investigated. The influences of the molecular length and chemical composition of the nanofibers on the release rate and the amount of released polyethylene glycols were evaluated. Longer molecules released faster, as evidenced by a significantly higher amount of released molecules after 72 hours. However, the influence of the chemical composition of nanofibers was even more distinct - the highest amount of polyethylene glycol molecules released from polyvinyl alcohol nanofibers, the lowest amount from polylactide nanofibers.
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Affiliation(s)
- Jakub Hrib
- The Institute of Macromolecular Chemistry, Academy of Sciences of the Czech Republic, Heyrovsky Sq. 2, 162 06 Prague 6, Czech Republic
| | - Jakub Sirc
- The Institute of Macromolecular Chemistry, Academy of Sciences of the Czech Republic, Heyrovsky Sq. 2, 162 06 Prague 6, Czech Republic
| | - Radka Hobzova
- The Institute of Macromolecular Chemistry, Academy of Sciences of the Czech Republic, Heyrovsky Sq. 2, 162 06 Prague 6, Czech Republic
| | - Zuzana Hampejsova
- Department of Analytical Chemistry, Faculty of Science, Charles University in Prague, Albertov 2030, 128 43 Prague 2, Czech Republic
| | - Zuzana Bosakova
- Department of Analytical Chemistry, Faculty of Science, Charles University in Prague, Albertov 2030, 128 43 Prague 2, Czech Republic
| | - Marcela Munzarova
- Nanovia Ltd., Podkrusnohorska 271, 436 03 Litvinov-Chuderin, Czech Republic
| | - Jiri Michalek
- The Institute of Macromolecular Chemistry, Academy of Sciences of the Czech Republic, Heyrovsky Sq. 2, 162 06 Prague 6, Czech Republic
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Mei F, Peng Y, Lu S, Sun F, Zhang Y, Ge C, Zhang Y, Gu H, Wang Y, Zhao X, Wang G. Synthesis and Characterization of Biodegradable Poly(lactic-co-glycolic acid). J MACROMOL SCI B 2015. [DOI: 10.1080/00222348.2014.1002325] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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28
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Mohaček-Grošev V, Šoštarić V, Maksimović A. Raman spectroscopic evidence of low temperature stability of D,L-glycolic and L-(+)-lactic acid crystals. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2015; 140:35-43. [PMID: 25579800 DOI: 10.1016/j.saa.2014.12.048] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/04/2014] [Accepted: 12/09/2014] [Indexed: 06/04/2023]
Abstract
Raman and infrared spectra of polycrystalline D,L-glycolic and L-(+) lactic acid are presented and assigned both by an ab initio calculation of normal modes of free conformers and by self-consistent-charge density-functional-theory computational program DFTB+. Temperature dependent Raman spectra from 295 K to 10 K reveal great stability of crystal lattices, since no soft modes and no band splittings that could be attributed to changes of the number of molecules per unit cell were observed. A semiempirical calculation with GULP program was used to estimate the strength of hydrogen bonds in crystals: in glycolic acid they have energies of -0.337 eV/mol, -0.329 eV/mol, -0.262 eV/mol and -0.242 eV/mol, while in lactic acid two hydrogen bonds have energies of -0.283 eV/mol and -0.202 eV/mol.
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Solanki AR, Kamath BV, Thakore S. Carbohydrate crosslinked biocompatible polyurethanes: Synthesis, characterization, and drug delivery studies. J Appl Polym Sci 2015. [DOI: 10.1002/app.42223] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Affiliation(s)
- Archana Ritesh Solanki
- Department of Chemistry; Faculty of Science; The Maharaja Sayajirao University of Baroda; Vadodara 390002 India
| | - Bolavinayak V. Kamath
- Institute of Infrastructure Technology Research and Management; Ahmedabad 380026 India
| | - Sonal Thakore
- Department of Chemistry; Faculty of Science; The Maharaja Sayajirao University of Baroda; Vadodara 390002 India
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Abstract
Biodegradable polymers have played an important role in the delivery of drugs in a controlled and targeted manner. Polylactic-co-glycolic acid (PLGA) is one of the extensively researched synthetic biodegradable polymers due to its favorable properties. It is also known as a ‘Smart Polymer’ due to its stimuli sensitive behavior. A wide range of PLGA-based drug delivery systems have been reported for the treatment or diagnosis of various diseases and disorders. The present review provides an overview of the chemistry, physicochemical properties, biodegradation behavior, evaluation parameters and applications of PLGA in drug delivery. Different drug–polymer combinations developed into drug delivery or carrier systems are enumerated and discussed.
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31
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Cheng T, Ortiz RF, Vedantham K, Naccache R, Vetrone F, Marks RS, Steele TW. Tunable Chemical Release from Polyester Thin Film by Photocatalytic Zinc Oxide and Doped LiYF4 Upconverting Nanoparticles. Biomacromolecules 2014; 16:364-73. [DOI: 10.1021/bm501567m] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Affiliation(s)
- Ting Cheng
- School of Materials Science & Engineering, College of Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore
| | - Raphael Francois Ortiz
- School of Materials Science & Engineering, College of Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore
| | - Kumar Vedantham
- School of Materials Science & Engineering, College of Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore
| | - Rafik Naccache
- Institut
National de la Recherche Scientifique—Énergie, Matériaux,
et Télécommunications, Université du Québec, 1650
Lionel-Boulet, Varennes, Québec J3X 1S2, Canada
| | - Fiorenzo Vetrone
- Institut
National de la Recherche Scientifique—Énergie, Matériaux,
et Télécommunications, Université du Québec, 1650
Lionel-Boulet, Varennes, Québec J3X 1S2, Canada
| | - Robert S. Marks
- School of Materials Science & Engineering, College of Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore
- Department
of Biotechnology Engineering, Faculty of Engineering Sciences, Ben Gurion University of the Negev, P.O. Box 653, Beer Sheva 84105, Israel
| | - Terry W.J. Steele
- School of Materials Science & Engineering, College of Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore
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Seo EH, Na K. Polyurethane membrane with porous surface for controlled drug release in drug eluting stent. Biomater Res 2014; 18:15. [PMID: 26331066 PMCID: PMC4552100 DOI: 10.1186/2055-7124-18-15] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2014] [Accepted: 09/24/2014] [Indexed: 01/22/2023] Open
Abstract
Background Membrane covered drug eluting stents (DES) were prepared to prevent tumor ingrowth and to control drug release. Polyurethane (PU) is commonly used for DES coating material because of high tensile strength. The release of paclitaxel (PTX) may increase from porous PU membrane. Results Polyethylene glycol (PEG) was incorporated into PU membranes to form porous structure and control the release of hydrophobic anti-cancer drug such as PTX. The bare metal stents were coated with PEG incorporated PU and then, PEG was washed out to form porous structure. The crystallization of PTX was inhibited in porous PU membranes and the release of PTX from porous PU membranes was approximately 8.6% more extended over 19 days. Conclusions The enhanced release of PTX from porous PU membranes may increase the patency for the DES covering materials.
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Affiliation(s)
- Eun Ha Seo
- Department of Biotechnology, The Catholic University of Korea, 43 Jibong-ro, Wonmi-gu, Bucheon-si, Gyeonggi-do, 420-743 South Korea
| | - Kun Na
- Department of Biotechnology, The Catholic University of Korea, 43 Jibong-ro, Wonmi-gu, Bucheon-si, Gyeonggi-do, 420-743 South Korea
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Ng XW, Huang Y, Liu KL, Boey FYC, Venkatraman SS. Investigation of cenderitide controlled release platforms for potential local treatment of cardiovascular pathology. J Pharm Sci 2014; 103:1400-10. [PMID: 24590596 DOI: 10.1002/jps.23910] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2013] [Revised: 01/16/2014] [Accepted: 02/03/2014] [Indexed: 12/16/2022]
Abstract
In this work, we focused on the development and investigation of controlled release matrices for a novel cardiotherapeutic peptide, cenderitide (CD-NP) that has shown to be useful for control of ventricular remodeling. To circumvent the hydrophilicity disparity between CD-NP and hydrophobic polymer matrix, a cosolvent system (water/dichloromethane) was selected for investigation. The effect of emulsification conditions, addition of poly(ethylene glycol) (PEG) and its copolymer on the release mechanism and profile were investigated. To verify the retention of bioactivity of entrapped CD-NP in different formulations, the generation of 3',5' cyclic guanosine monophospate (cGMP) and the inhibition of human cardiac fibroblast (HCF) were evaluated. The results showed that neat poly(ε-caprolactone) matrices carried out via two distinct emulsification conditions had either an unacceptably high burst or incomplete release of CD-NP; and the addition of PEG and its copolymer obtained intermediate profiles. Our confocal laser scanning microscopy and surface morphological investigations showed that the copolymer excipient was superior in playing stabilizer role by colocalizing and redistributing peptide throughout the matrix, making the release less sensitive to emulsification conditions. Furthermore, the released CD-NP is able to generate the cGMP and inhibit the HCF proliferation. Our investigations showed that CD-NP-loaded platforms can be a feasible option to provide sustained antifibrotic moderation of fibrotic scar formation and be potentially used to alleviate the adverse effects of cardiac remodeling.
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Affiliation(s)
- Xu Wen Ng
- School of Materials Science & Engineering, Nanyang Technological University, Singapore, 639798, Singapore
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Mealy J, Fedorchak M, Little S. In vitro characterization of a controlled-release ocular insert for delivery of brimonidine tartrate. Acta Biomater 2014; 10:87-93. [PMID: 24080317 DOI: 10.1016/j.actbio.2013.09.024] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2013] [Revised: 09/06/2013] [Accepted: 09/19/2013] [Indexed: 10/26/2022]
Abstract
Glaucoma is the second leading cause of blindness in the US. Brimonidine tartrate (BT) is a modern anti-glaucoma agent that is currently administered as frequently as a thrice-daily topical eye drop medication. Accordingly, compliance with BT regimens is low, limiting overall effectiveness. One attempt that has previously proved effective in addressing non-adherence is the formation of ocular inserts, such as the Ocusert(®), whose diffusion-based control released an older drug (pilocarpine) for a week-long period. Modern controlled drug-release technology provides an avenue for extending the release of practically any drug (including new drugs such as BT) for as long as 1 month from a singular insert. Currently, no controlled-release formulations for BT exist. This work outlines the development and characterization of a BT-releasing ocular insert designed from poly(lactic co-glycolic) acid/polyethylene glycol (PEG). It was found that a formulation containing 15% PEG can be created that produces a linear BT-release profile corresponding to BT eye drop delivery estimates. Additionally, these inserts were shown, through the use of atomic force microscopy and scanning electron microscopy, to have smooth surfaces and physical properties suitable for ophthalmic use.
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Mogal V, Papper V, Chaurasia A, Feng G, Marks R, Steele T. Novel on-demand bioadhesion to soft tissue in wet environments. Macromol Biosci 2013; 14:478-84. [PMID: 24293270 DOI: 10.1002/mabi.201300380] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2013] [Revised: 10/21/2013] [Indexed: 02/06/2023]
Abstract
Current methods of tissue fixation rely on mechanical-related technologies developed from the clothing and carpentry industries. Herein, a novel bioadhesive method that allows tuneable adhesion and is also applicable to biodegradable polyester substrates is described. Diazirine is the key functional group that allows strong soft tissue crosslinking and on-demand adhesion based on a free radical mechanism. Plasma post-irradiation grafting makes it possible to graft diazirine onto PLGA substrates. When the diazirine-PLGA films, placed on wetted ex vivo swine aortas, are activated with low intensity UV light, lap shear strength of up to 450 ± 50 mN cm(-2) is observed, which is one order of magnitude higher than hydrogel bioadhesives placed on similar soft tissues. The diazirine-modified PLGA thin films could be added on top of previously developed technologies for minimally invasive surgeries. The present work is focused on the chemistry, grafting, and lap shear strength of the alkyl diazirine-modified PLGA bioadhesive films.
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Affiliation(s)
- Vishal Mogal
- Materials and Science Engineering, Division of Materials Technology, Nanyang Technological University, Singapore, 639798
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36
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Snejdrova E, Dittrich M, Drastik M. Plasticized branched aliphatic oligoesters as potential mucoadhesive drug carriers. Int J Pharm 2013; 458:282-6. [DOI: 10.1016/j.ijpharm.2013.10.030] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2013] [Revised: 10/15/2013] [Accepted: 10/16/2013] [Indexed: 11/13/2022]
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Karavasili C, Bouropoulos N, Kontopoulou I, Smith A, van der Merwe SM, Rehman IUR, Ahmad Z, Fatouros DG. Preparation and characterization of multiactive electrospun fibers: Poly-ɛ-carpolactone fibers loaded with hydroxyapatite and selected NSAIDs. J Biomed Mater Res A 2013; 102:2583-9. [DOI: 10.1002/jbm.a.34931] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2013] [Revised: 07/10/2013] [Accepted: 08/05/2013] [Indexed: 11/05/2022]
Affiliation(s)
- Chirstina Karavasili
- Department of Pharmaceutical Technology; Aristotle University of Thessaloniki, School of Pharmacy; GR-54124 Thessaloniki Greece
| | - Nikolaos Bouropoulos
- Department of Materials Science; University of Patras; 26504 Rio Patras Greece
- Foundation for Research and Technology Hellas; Institute of Chemical Engineering and High Temperature Chemical Processes; FORTH/ICE-HT, P.O. Box 1414 GR-26504 Patras Greece
| | - Ioanna Kontopoulou
- Department of Materials Science; University of Patras; 26504 Rio Patras Greece
| | - Ashleigh Smith
- School of Pharmacy and Biomedical Sciences; University of Portsmouth, St. Michael's Building; White Swan Road, Portsmouth PO1 2DT United Kingdom
| | - Susanna M. van der Merwe
- School of Pharmacy and Biomedical Sciences; University of Portsmouth, St. Michael's Building; White Swan Road, Portsmouth PO1 2DT United Kingdom
| | - Ihtesham U. R. Rehman
- Department of Materials Science and Engineering; The Kroto Research Institute, University of Sheffield; Sheffield S3 7HQ United Kingdom
| | - Zeeshan Ahmad
- School of Pharmacy; De Montfort University; Leicester LE1 9BH United Kingdom
| | - Dimitrios G. Fatouros
- Department of Pharmaceutical Technology; Aristotle University of Thessaloniki, School of Pharmacy; GR-54124 Thessaloniki Greece
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Liu YC, Peng Y, Lwin NC, Venkatraman SS, Wong TT, Mehta JS. A biodegradable, sustained-released, prednisolone acetate microfilm drug delivery system effectively prolongs corneal allograft survival in the rat keratoplasty model. PLoS One 2013; 8:e70419. [PMID: 23940573 PMCID: PMC3734265 DOI: 10.1371/journal.pone.0070419] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2013] [Accepted: 06/22/2013] [Indexed: 11/18/2022] Open
Abstract
Frequent and long-term use of topical corticosteroids after corneal transplantation is necessary to prevent graft rejection. However, it relies heavily on patient compliance, and sustained therapeutic drug levels are often not achieved with administration of topical eye drops. A biodegradable drug delivery system with a controlled and sustained drug release may circumvent these limitations. In this study, we investigated the efficacy of a prednisolone acetate (PA)-loaded poly (d,l-lactide-co-ε-caprolactone) (PLC) microfilm drug delivery system on promoting the survival of allogeneic grafts after penetrating keratoplasty (PK) using a rat model. The drug release profiles of the microfilms were characterized (group 1). Subsequently, forty-eight PK were performed in four experimental groups: syngeneic control grafts (group 2), allogeneic control grafts (group 3), allogeneic grafts with subconjunctivally-implanted PA microfilm (group 4), and allogeneic grafts with PA eye drops (group 5; n = 12 in each). PA-loaded microfilm achieved a sustained and steady release at a rate of 0.006-0.009 mg/day, with a consistent aqueous drug concentration of 207-209 ng/ml. The mean survival days was >28 days in group 2, 9.9±0.8 days in group 3, 26.8±2.7 days in group 4, and 26.4±3.4 days in group 5 (P = 0.023 and P = 0.027 compared with group 3). Statistically significant decrease in CD4+, CD163+, CD 25+, and CD54+ cell infiltration was observed in group 4 and group 5 compared with group 3 (P<0.001). There was no significant difference in the mean survival and immunohistochemical analysis between group 4 and group 5. These results showed that sustained PA-loaded microfilm effectively prolongs corneal allograft survival. It is as effective as conventional PA eye drops, providing a promising clinically applicable alternative for patients undergoing corneal transplantation.
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Affiliation(s)
- Yu-Chi Liu
- Tissue Engineering and Stem Cell Group, Singapore Eye Research Institute, Singapore, Singapore
- Singapore National Eye Centre, Singapore, Singapore
| | - Yan Peng
- School of Materials Science and Engineering, Nanyang Technological University, Singapore, Singapore
| | - Nyein Chan Lwin
- Tissue Engineering and Stem Cell Group, Singapore Eye Research Institute, Singapore, Singapore
| | - Subbu S. Venkatraman
- School of Materials Science and Engineering, Nanyang Technological University, Singapore, Singapore
| | - Tina T. Wong
- Singapore National Eye Centre, Singapore, Singapore
- School of Materials Science and Engineering, Nanyang Technological University, Singapore, Singapore
- Ocular Therapeutics and Drug Delivery Research Group, Singapore Eye Research Institute, Singapore, Singapore
- * E-mail: (JSM); (TTW)
| | - Jodhbir S. Mehta
- Tissue Engineering and Stem Cell Group, Singapore Eye Research Institute, Singapore, Singapore
- Singapore National Eye Centre, Singapore, Singapore
- Department of Clinical Sciences, Duke-NUS Graduate Medical School, Singapore, Singapore
- * E-mail: (JSM); (TTW)
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Steele TWJ, Huang CL, Nguyen E, Sarig U, Kumar S, Widjaja E, Loo JSC, Machluf M, Boey F, Vukadinovic Z, Hilfiker A, Venkatraman SS. Collagen-cellulose composite thin films that mimic soft-tissue and allow stem-cell orientation. JOURNAL OF MATERIALS SCIENCE. MATERIALS IN MEDICINE 2013; 24:2013-2027. [PMID: 23670603 DOI: 10.1007/s10856-013-4940-3] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/10/2012] [Accepted: 04/20/2013] [Indexed: 06/02/2023]
Abstract
Mechanical properties of collagen films are less than ideal for biomaterial development towards musculoskeletal repair or cardiovascular applications. Herein, we present a collagen-cellulose composite film (CCCF) compared against swine small intestine submucosa in regards to mechanical properties, cell growth, and histological analysis. CCCF was additionally characterized by FE-SEM, NMR, mass spectrometry, and Raman Microscopy to elucidate its physical structure, collagen-cellulose composition, and structure activity relationships. Mechanical properties of the CCCF were tested in both wet and dry environments, with anisotropic stress-strain curves that mimicked soft-tissue. Mesenchymal stem cells, human umbilical vein endothelial cells, and human coronary artery smooth muscle cells were able to proliferate on the collagen films with specific cell orientation. Mesenchymal stem cells had a higher proliferation index and were able to infiltrate CCCF to a higher degree than small intestine submucosa. With the underlying biological properties, we present a collagen-cellulose composite film towards forthcoming biomaterial-related applications.
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Affiliation(s)
- Terry W J Steele
- Division of Materials Technology, Materials and Science Engineering, Nanyang Technological University, N4.1-01-30, 50 Nanyang Ave, Singapore, 639798, Singapore.
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Zhu G, Wang F, Xu K, Gao Q, Liu Y. Morphology and properties of poly(lactic acid-co-glycolic acid) film improved by blending with poly(γ-benzyl l-glutamate). RESEARCH ON CHEMICAL INTERMEDIATES 2013. [DOI: 10.1007/s11164-013-1300-3] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Kathawala MH, Xiong S, Richards M, Ng KW, George S, Loo SCJ. Emerging in vitro models for safety screening of high-volume production nanomaterials under environmentally relevant exposure conditions. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2013; 9:1504-1520. [PMID: 23019115 DOI: 10.1002/smll.201201452] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/26/2012] [Indexed: 06/01/2023]
Abstract
The rising production of nanomaterial-based consumer products has raised safety concerns. Testing these with animal and other direct models is neither ethically nor economically viable, nor quick enough. This review aims to discuss the strength of in vitro testing, including the use of 2D and 3D cultures, stem cells, and tissue constructs, etc., which would give fast and repeatable answers of a highly specific nature, while remaining relevant to in vivo outcomes. These results can then be combined and the overall toxicity predicted with relative accuracy. Such in vitro models can screen potentially toxic nanomaterials which, if required, can undergo further stringent studies in animals. The cyto- and phototoxicity of some high-volume production nanomaterials, using in vitro models, is also reviewed.
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Affiliation(s)
- Mustafa Hussain Kathawala
- Nanyang Technological University, School of Materials Science and Engineering, 50 Nanyang Avenue, Singapore 639798, Singapore
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Huang CL, Kumar S, Tan JJ, Boey FY, Venkatraman SS, Steele TW, Loo JS. Modulating drug release from poly(lactic-co-glycolic acid) thin films through terminal end-groups and molecular weight. Polym Degrad Stab 2013. [DOI: 10.1016/j.polymdegradstab.2012.11.012] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Steele TWJ, Huang CL, Kumar S, Irvine S, Boey FYC, Loo JSC, Venkatraman SS. Novel gradient casting method provides high-throughput assessment of blended polyester poly(lactic-co-glycolic acid) thin films for parameter optimization. Acta Biomater 2012; 8:2263-70. [PMID: 22293582 DOI: 10.1016/j.actbio.2012.01.014] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2011] [Revised: 12/07/2011] [Accepted: 01/10/2012] [Indexed: 11/16/2022]
Abstract
Pure polymer films cannot meet the diverse range of controlled release and material properties demanded for the fabrication of medical implants or other devices. Additives are added to modulate and optimize thin films for the desired qualities. To characterize the property trends that depend on additive concentration, an assay was designed which involved casting a single polyester poly(lactic-co-glycolic acid) (PLGA) film that blends a linear gradient of any PLGA-soluble additive desired. Four gradient PLGA films were produced by blending polyethylene glycol or the more hydrophobic polypropylene glycol. The films were made using a custom glass gradient maker in conjunction with a 180 cm film applicator. These films were characterized in terms of thickness, percent additive, total polymer (PLGA+additive), and controlled drug release using drug-like fluorescent molecules such as coumarin 6 (COU) or fluorescein diacetate (FDAc). Material properties of elongation and modulus were also accessed. Linear gradients of additives were readily generated, with phase separation being the limiting factor. Additive concentration had a Pearson's correlation factor (R) of >0.93 with respect to the per cent total release after 30 days for all gradients characterized. Release of COU had a near zero-order release over the same time period, suggesting that coumarin analogs may be suitable for use in PLGA/polyethylene glycol or PLGA/polypropylene glycol matrices, with each having unique material properties while allowing tuneable drug release. The gradient casting method described has considerable potential in offering higher throughput for optimizing film or coating material properties for medical implants or other devices.
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Affiliation(s)
- Terry W J Steele
- Nanyang Technological University, Materials and Science Engineering, Division of Materials Technology, Singapore 639798, Singapore
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Steele TWJ, Huang CL, Kumar S, Widjaja E, Chiang Boey FY, Loo JSC, Venkatraman SS. High-throughput screening of PLGA thin films utilizing hydrophobic fluorescent dyes for hydrophobic drug compounds. J Pharm Sci 2011; 100:4317-29. [PMID: 21607953 DOI: 10.1002/jps.22625] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2011] [Revised: 04/02/2011] [Accepted: 04/26/2011] [Indexed: 01/06/2023]
Abstract
Hydrophobic, antirestenotic drugs such as paclitaxel (PCTX) and rapamycin are often incorporated into thin film coatings for local delivery using implantable medical devices and polymers such as drug-eluting stents and balloons. Selecting the optimum coating formulation through screening the release profile of these drugs in thin films is time consuming and labor intensive. We describe here a high-throughput assay utilizing three model hydrophobic fluorescent compounds: fluorescein diacetate (FDAc), coumarin-6, and rhodamine 6G that were incorporated into poly(d,l-lactide-co-glycolide) (PLGA) and PLGA-polyethylene glycol films. Raman microscopy determined the hydrophobic fluorescent dye distribution within the PLGA thin films in comparison with that of PCTX. Their subsequent release was screened in a high-throughput assay and directly compared with HPLC quantification of PCTX release. It was observed that PCTX controlled-release kinetics could be mimicked by a hydrophobic dye that had similar octanol-water partition coefficient values and homogeneous dissolution in a PLGA matrix as the drug. In particular, FDAc was found to be the optimal hydrophobic dye at modeling the burst release as well as the total amount of PCTX released over a period of 30 days.
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Affiliation(s)
- Terry W J Steele
- Materials and Science Engineering, Division of Materials Technology, Nanyang Technological University, Singapore 639798
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