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Mitropoulou A, Markatos DN, Dimopoulos A, Marazioti A, Mikelis CM, Mavrilas D. Development and Evaluation of Biodegradable Core-Shell Microfibrous and Nanofibrous Scaffolds for Tissue Engineering Applications. JOURNAL OF MATERIALS SCIENCE. MATERIALS IN MEDICINE 2024; 35:10. [PMID: 38285092 PMCID: PMC10824864 DOI: 10.1007/s10856-024-06777-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/20/2023] [Accepted: 01/09/2024] [Indexed: 01/30/2024]
Abstract
Tissue engineering scaffolds as three-dimensional substrates may serve as ideal templates for tissue regeneration by simulating the structure of the extracellular matrix (ECM). Many biodegradable synthetic polymers, either hydrophobic, like Poly-ε-caprolactone (PCL), or hydrophilic, like Poly(Vinyl Alcohol) (PVA), are widely used as candidate bioactive materials for fabricating tissue engineering scaffolds. However, a combination of good cytocompatibility of hydrophilic polymers with good biomechanical performance of hydrophobic polymers could be beneficial for the in vivo performance of the scaffolds. In this study, we aimed to fabricate biodegradable fibrous scaffolds by combining the properties of hydrophobic PCL with those of hydrophilic PVA and evaluate their properties in comparison with pristine PCL scaffolds. Therefore, single-layered PCL scaffolds, sequential tri-layered (PVA/PCL/PVA), and core-shell (PVA as shell and PCL as core) composite scaffolds were developed utilizing the electrospinning technique. The material structural and biomechanical properties of the electrospun scaffolds, before and after their hydrolytic degradation over a seven-month period following storage in phosphate-buffered saline (PBS) at 37 °C, were comprehensively compared. In addition, human embryonic kidney cells (HEK-293) were cultured on the scaffolds to investigate potential cell attachment, infiltration, and proliferation. The results demonstrated the long-term efficacy of core-shell biodegradable fibrous scaffolds in comparison to single-layers PCL and tri-layers PVA/PCL/PVA, not only due to its superior morphological characteristics and mechanical properties, but also due to its ability to promote homogeneous cell distribution and proliferation, without any external chemical or physical stimuli.
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Affiliation(s)
- Athina Mitropoulou
- Department of Mechanical Engineering and Aeronautics, Laboratory of Biomechanics and Biomedical Engineering, University of Patras, Patras, GR, Greece.
| | - Dionysios N Markatos
- Department of Mechanical Engineering and Aeronautics, Laboratory of Technology and Strength of Materials, University of Patras, Patras, GR, Greece
| | - Andreas Dimopoulos
- Prometheus Division of Skeletal Tissue Engineering, KU Leuven, Leuven, Belgium
- Skeletal Biology and Engineering Research Center, Department of Development and Regeneration, KU Leuven, Leuven, Belgium
| | - Antonia Marazioti
- Department of Physiotherapy, Laboratory of Basic Sciences, University of Peloponnese, Sparta, GR, Greece
| | | | - Dimosthenis Mavrilas
- Department of Mechanical Engineering and Aeronautics, Laboratory of Biomechanics and Biomedical Engineering, University of Patras, Patras, GR, Greece
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Makuloluwa AK, Hamill KJ, Rauz S, Bosworth L, Haneef A, Romano V, Williams RL, Dartt DA, Kaye SB. The conjunctival extracellular matrix, related disorders and development of substrates for conjunctival restoration. Ocul Surf 2023; 28:322-335. [PMID: 34102309 DOI: 10.1016/j.jtos.2021.05.011] [Citation(s) in RCA: 10] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2021] [Revised: 05/05/2021] [Accepted: 05/26/2021] [Indexed: 12/15/2022]
Abstract
The conjunctiva can be damaged by numerous diseases with scarring, loss of tissue and dysfunction. Depending on extent of damage, restoration of function may require a conjunctival graft. A wide variety of biological and synthetic substrates have been tested in the search for optimal conditions for ex vivo culture of conjunctival epithelial cells as a route toward tissue grafts. Each substrate has specific advantages but also disadvantages related to their unique physical and biological characteristics, and identification and development of an improved substrate remains a priority. To achieve the goal of mimicking and restoring a biological material, requires information from the material. Specifically, extracellular matrix (ECM) derived from conjunctival tissue. Knowledge of the composition and structure of native ECM and identifying contributions of individual components to its function would enable using or mimicking those components to develop improved biological substrates. ECM is comprised of two components: basement membrane secreted predominantly by epithelial cells containing laminins and type IV collagens, which directly support epithelial and goblet cell adhesion differentiation and growth and, interstitial matrix secreted by fibroblasts in lamina propria, which provides mechanical and structural support. This review presents current knowledge on anatomy, composition of conjunctival ECM and related conjunctival disorders. Requirements of potential substrates for conjunctival tissue engineering and transplantation are discussed. Biological and synthetic substrates and their components are described in an accompanying review.
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Affiliation(s)
- Aruni K Makuloluwa
- Department of Eye and Vision Science, University of Liverpool, William Duncan Building, 6 West Derby Street, Liverpool, L7 8TX, UK
| | - Kevin J Hamill
- Department of Eye and Vision Science, University of Liverpool, William Duncan Building, 6 West Derby Street, Liverpool, L7 8TX, UK
| | - Saaeha Rauz
- Academic Unit of Ophthalmology, Institute of Inflammation and Ageing, University of Birmingham and Birmingham and Midland Eye Centre, Dudley Road Birmingham, B18 7QU, UK
| | - Lucy Bosworth
- Department of Eye and Vision Science, University of Liverpool, William Duncan Building, 6 West Derby Street, Liverpool, L7 8TX, UK
| | - Atikah Haneef
- Department of Eye and Vision Science, University of Liverpool, William Duncan Building, 6 West Derby Street, Liverpool, L7 8TX, UK
| | - Vito Romano
- Department of Eye and Vision Science, University of Liverpool, William Duncan Building, 6 West Derby Street, Liverpool, L7 8TX, UK
| | - Rachel L Williams
- Department of Eye and Vision Science, University of Liverpool, William Duncan Building, 6 West Derby Street, Liverpool, L7 8TX, UK
| | - Darlene A Dartt
- Schepens Eye Research Institute, Mass Eye and Ear Infirmary, Harvard Medical School, 20 Staniford St. Boston, MA, 02114, USA
| | - Stephen B Kaye
- Department of Eye and Vision Science, University of Liverpool, William Duncan Building, 6 West Derby Street, Liverpool, L7 8TX, UK.
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3
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Wan L, Lu L, Zhu T, Liu Z, Du R, Luo Q, Xu Q, Zhang Q, Jia X. Bulk Erosion Degradation Mechanism for Poly(1,8-octanediol- co-citrate) Elastomer: An In Vivo and In Vitro Investigation. Biomacromolecules 2022; 23:4268-4281. [PMID: 36094894 DOI: 10.1021/acs.biomac.2c00737] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
As a biodegradable elastomer, poly(1,8-octanediol-co-citrate) (POC) has been widely applied in tissue engineering and implantable electronics. However, the unclear degradation mechanism has posed a great challenge for the better application and development of POC. To reveal the degradation mechanism, here, we present a systematic investigation into in vivo and in vitro degradation behaviors of POC. Initially, critical factors, including chemical structures, hydrophilic and water-absorbency characteristics, and degradation reaction of POC, are investigated. Then, various degradation-induced changes during in vitro degradation of POC-x (POC with different cross-linking densities) are monitored and discussed. The results show that (1) cross-linking densities exponentially drop with degradation time; (2) mass loss and PBS-absorption ratio grow nonlinearly; (3) the morphology on the cross-section changes from flat to rough at a microscopic level; (4) the cubic samples keep swelling until they collapse into fragments from a macro view; and (5) the mechanical properties experience a sharp drop at the beginning of degradation. Finally, the in vivo degradation behaviors of POC-x are investigated, and the results are similar to those in vitro. The comprehensive assessment suggests that the in vitro and in vivo degradation of POC occurs primarily through bulk erosion. Inflammation responses triggered by the degradation of POC-x are comparable to poly(lactic acid), or even less obvious. In addition, the mechanical evaluation of POC in the simulated application environment is first proposed and conducted in this work for a more appropriate application. The degradation mechanism of POC revealed will greatly promote the further development and application of POC-based materials in the biomedical field.
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Affiliation(s)
- Lu Wan
- Key Laboratory of High Performance Polymer Material and Technology of MOE, Department of Polymer Science and Engineering, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210023, P. R. China
| | - Liangliang Lu
- State Key Laboratory of Pharmaceutical Biotechnology, Department of Biotechnology and Pharmaceutical Sciences, School of Life Sciences, Nanjing University, Nanjing 210023, P R China
| | - Tangsong Zhu
- Key Laboratory of High Performance Polymer Material and Technology of MOE, Department of Polymer Science and Engineering, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210023, P. R. China
| | - Zhichang Liu
- Kuang Yaming Honors School, Nanjing University, Nanjing 210023, P. R. China
| | - Ruichun Du
- Key Laboratory of High Performance Polymer Material and Technology of MOE, Department of Polymer Science and Engineering, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210023, P. R. China
| | - Qiong Luo
- State Key Laboratory of Pharmaceutical Biotechnology, Department of Biotechnology and Pharmaceutical Sciences, School of Life Sciences, Nanjing University, Nanjing 210023, P R China
| | - Qiang Xu
- State Key Laboratory of Pharmaceutical Biotechnology, Department of Biotechnology and Pharmaceutical Sciences, School of Life Sciences, Nanjing University, Nanjing 210023, P R China
| | - Qiuhong Zhang
- Key Laboratory of High Performance Polymer Material and Technology of MOE, Department of Polymer Science and Engineering, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210023, P. R. China
| | - Xudong Jia
- Key Laboratory of High Performance Polymer Material and Technology of MOE, Department of Polymer Science and Engineering, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210023, P. R. China.,State Key Laboratory of Coordination Chemistry, Nanjing University, Nanjing 210023, P. R. China
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Wu B, Wu L, He Y, Yin Z, Deng L. Engineered PLGA microspheres for extended release of brexpiprazole: in vitro and in vivo studies. Drug Dev Ind Pharm 2021; 47:1001-1010. [PMID: 34032181 DOI: 10.1080/03639045.2021.1934859] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Abstract
OBJECTIVE To develop poly(d,l-lactide-co-glycolide) (PLGA) microspheres to achieve controlled and sustained release of brexpiprazole in vivo. METHODS Brexpiprazole microspheres were prepared by oil-in-water emulsion-solvent evaporation method and evaluated for morphology, particle size, encapsulation efficiency, drug loading, conformation and compatibility of drug and polymer, in vitro release, and in vivo pharmacokinetics. By establishing the relationship between in vitro and in vivo release, it helps identify the appropriate in vitro release conditions to explore release profiles of brexpiprazole microspheres. RESULTS Porous PLGA microspheres with near spherical morphology were obtained displaying an average diameter of 20.43 ± 0.06 μm, a drug loading capacity of 27.24 ± 0.33% and an encapsulation efficiency of 81.87 ± 1.07%. Fourier transform infrared spectroscopy (FTIR), powder X-ray diffraction (PXRD), and differential scanning calorimetry (DSC) analysis showed that some drugs encapsulated in the microspheres remained in the amorphous state and some were in the crystalline state. Different release setups resulted in different release kinetics. The dialysis release setup displayed a cumulative release of about 65% within 60 days, while the sample-and-separate setup showed a cumulative release of about 77% within 35 days. Per pharmacokinetic studies in rats, a burst phase in the plasma concentration-time curve was observed after intramuscular injection in the first 2 h followed by a clear zero-order release phase. Overall, brexpiprazole achieved in vivo sustained release from PLGA microspheres for up to 40 days. CONCLUSION A PLGA microsphere loaded with brexpiprazole was successfully developed and demonstrated potential for extended-release of therapeutics for schizophrenia treatment.
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Affiliation(s)
- Bangqing Wu
- Key Laboratory of Drug-Targeting and Drug Delivery System of the Education Ministry and Sichuan Province, Sichuan Engineering Laboratory for Plant-Sourced Drug and Sichuan Research Center for Drug Precision Industrial Technology, West China School of Pharmacy, Sichuan University, Chengdu, China
| | - Lijun Wu
- Key Laboratory of Drug-Targeting and Drug Delivery System of the Education Ministry and Sichuan Province, Sichuan Engineering Laboratory for Plant-Sourced Drug and Sichuan Research Center for Drug Precision Industrial Technology, West China School of Pharmacy, Sichuan University, Chengdu, China
| | - Yingju He
- Key Laboratory of Drug-Targeting and Drug Delivery System of the Education Ministry and Sichuan Province, Sichuan Engineering Laboratory for Plant-Sourced Drug and Sichuan Research Center for Drug Precision Industrial Technology, West China School of Pharmacy, Sichuan University, Chengdu, China
| | - Zongning Yin
- Key Laboratory of Drug-Targeting and Drug Delivery System of the Education Ministry and Sichuan Province, Sichuan Engineering Laboratory for Plant-Sourced Drug and Sichuan Research Center for Drug Precision Industrial Technology, West China School of Pharmacy, Sichuan University, Chengdu, China
| | - Li Deng
- Key Laboratory of Drug-Targeting and Drug Delivery System of the Education Ministry and Sichuan Province, Sichuan Engineering Laboratory for Plant-Sourced Drug and Sichuan Research Center for Drug Precision Industrial Technology, West China School of Pharmacy, Sichuan University, Chengdu, China
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5
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Material Characterization of PCL:PLLA Electrospun Fibers Following Six Months Degradation In Vitro. Polymers (Basel) 2020; 12:polym12030700. [PMID: 32245277 PMCID: PMC7183275 DOI: 10.3390/polym12030700] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2020] [Revised: 03/11/2020] [Accepted: 03/19/2020] [Indexed: 12/21/2022] Open
Abstract
The annulus fibrosus-one of the two tissues comprising the intervertebral disc-is susceptible to injury and disease, leading to chronic pain and rupture. A synthetic, biodegradable material could provide a suitable scaffold that alleviates this pain and supports repair through tissue regeneration. The transfer of properties, particularly biomechanical, from scaffold to new tissue is essential and should occur at the same rate to prevent graft failure post-implantation. This study outlines the effect of hydrolytic degradation on the material properties of a novel blend of polycaprolactone and poly(lactic acid) electrospun nanofibers (50:50) over a six-month period following storage in phosphate buffered saline solution at 37 °C. As expected, the molecular weight distribution for this blend decreased over the 180-day period. This was in line with significant changes to fiber morphology, which appeared swollen and merged following observation using Scanning Electron Microscopy. Similarly, hydrolysis resulted in considerable remodeling of the scaffolds' polymer chains as demonstrated by sharp increases in percentage crystallinity and tensile properties becoming stiffer, stronger and more brittle over time. These mechanical data remained within the range reported for human annulus fibrosus tissue and their long-term efficacy further supports this novel blend as a potential scaffold to support tissue regeneration.
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Zhou J, Li L, Wang W, Zhao Y, Feng S. pH-responsive polymeric vesicles from branched copolymers. RSC Adv 2019; 9:41031-41037. [PMID: 35540065 PMCID: PMC9076388 DOI: 10.1039/c9ra08703f] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2019] [Accepted: 12/04/2019] [Indexed: 12/20/2022] Open
Abstract
A new type of branched copolymer, poly(l-lactide)2-b-poly(l-glutamic acid) (PLLA2-PLGA), based on polypeptide PLGA is synthesized by the ring-opening polymerization (ROP) of N-carboxyanhydride of γ-benzyl-l-glutamate (BLG-NCA) with amino-terminated PLLA2-NH2 and subsequent deprotection. The branched copolymer is characterized by 1H NMR, FTIR and GPC measurements. The self-assembly of the copolymers in aqueous media has been systematically discussed. A pyrene probe has been used to demonstrate the aggregated formation of PLLA2-PLGA in solution by measuring the critical micelle concentration (cmc). The morphology and size of the micelles have further been studied by transmission electron microscopy (TEM), dynamic light scattering (DLS) and field emission scanning electron microscopy (ESEM). We demonstrated that the Rh of the vesicle is depending on solution pH and salt concentration. The vesicles show good stability with remained shapes and sizes during the lyophilizing process. These vesicles have great potential in the application of drug delivery.
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Affiliation(s)
- Jinglun Zhou
- Key Laboratory of Special Functional Aggregated Materials, Ministry of Education, School of Chemistry and Chemical Engineering, Shandong University Jinan 250100 China
- Eco-Benign Plastics Technology Company Limited Jinan 250101 China
| | - Linlin Li
- Shandong Institute for Product Quality Inspection Jinan 250100 China
| | - Weishan Wang
- Shandong Institute for Product Quality Inspection Jinan 250100 China
| | - Yang Zhao
- Shandong Institute for Product Quality Inspection Jinan 250100 China
| | - Shengyu Feng
- Key Laboratory of Special Functional Aggregated Materials, Ministry of Education, School of Chemistry and Chemical Engineering, Shandong University Jinan 250100 China
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7
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Martins JA, Lach AA, Morris HL, Carr AJ, Mouthuy PA. Polydioxanone implants: A systematic review on safety and performance in patients. J Biomater Appl 2019; 34:902-916. [PMID: 31771403 PMCID: PMC7044756 DOI: 10.1177/0885328219888841] [Citation(s) in RCA: 31] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Affiliation(s)
- Joana A Martins
- Botnar Research Centre, Nuffield Department of Orthopaedics, Rheumatology and Musculoskeletal Sciences, University of Oxford, Oxford, United Kingdom
| | - Antonina A Lach
- Botnar Research Centre, Nuffield Department of Orthopaedics, Rheumatology and Musculoskeletal Sciences, University of Oxford, Oxford, United Kingdom
| | - Hayley L Morris
- Botnar Research Centre, Nuffield Department of Orthopaedics, Rheumatology and Musculoskeletal Sciences, University of Oxford, Oxford, United Kingdom
| | - Andrew J Carr
- Botnar Research Centre, Nuffield Department of Orthopaedics, Rheumatology and Musculoskeletal Sciences, University of Oxford, Oxford, United Kingdom.,NIHR Oxford Biomedical Research Centre, John Radcliffe Hospital, Oxford, United Kingdom
| | - Pierre-Alexis Mouthuy
- Botnar Research Centre, Nuffield Department of Orthopaedics, Rheumatology and Musculoskeletal Sciences, University of Oxford, Oxford, United Kingdom.,NIHR Oxford Biomedical Research Centre, John Radcliffe Hospital, Oxford, United Kingdom
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8
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Murcia Valderrama MA, van Putten RJ, Gruter GJM. The potential of oxalic – and glycolic acid based polyesters (review). Towards CO2 as a feedstock (Carbon Capture and Utilization – CCU). Eur Polym J 2019. [DOI: 10.1016/j.eurpolymj.2019.07.036] [Citation(s) in RCA: 42] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
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9
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Recent advances in polymer-based drug delivery systems for local anesthetics. Acta Biomater 2019; 96:55-67. [PMID: 31152941 DOI: 10.1016/j.actbio.2019.05.044] [Citation(s) in RCA: 50] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2018] [Revised: 05/16/2019] [Accepted: 05/19/2019] [Indexed: 12/19/2022]
Abstract
Local anesthetics, which cause temporary loss of pain by inhibiting the transmission of nerve impulses, have been widely used in clinical practice. However, neurotoxicity and short half-lives have significantly limited their clinical applications. To overcome those barriers, numerous drug delivery systems (DDS) have been designed to encapsulate local anesthetic agents, so that large doses can be released slowly and provide analgesia over a prolonged period. So far, multiple classes of local anesthetic carriers have been investigated, with some of them already on the market. Among those, polymer-based delivery platforms are the most extensively explored, especially in the form of polymeric nanoparticle carriers. This review gives a specific focus on the most commonly used natural and synthetic polymers for local anesthetics delivery, owing to their excellent biocompatibility, biodegradability and versatility. State-of-the-art studies concerning such polymer delivery systems have been discussed in depth. We also highlight the impact of those delivery platforms as well as some key challenges that need to be overcome for their broader clinical applications. STATEMENT OF SIGNIFICANCE: Currently, local anesthetics have been widely used in clinically practices to prevent transmission of nerve impulses. However, the applications of anesthetics are greatly limited due to their neurotoxicity and short half-lives. Moreover, it is difficult to maintain frequent administrations which can cause poor compliance and serious consequences. Numerous drug delivery systems have been developed to solve those issues. In this review, we highlight the recent advances in polymer-based drug delivery systems for local anesthetics. The advantages as well as shortcomings for different types of polymer-based drug delivery systems are summarized in this paper. In the end, we also give prospects for future development of polymer drug delivery systems for anesthetics.
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Zhang J, Jones S, Wang D, Wood A, Washington T, Acreman K, Cuevas B, Karau A. Influence of thermal annealing on mechanical properties and
in vitro
degradation of poly(
p
‐dioxanone). POLYM ENG SCI 2019. [DOI: 10.1002/pen.25169] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Jian‐Feng Zhang
- Medical Device Competence Center, Evonik Corporation Birmingham Alabama 35211
| | - Scott Jones
- Medical Device Competence Center, Evonik Corporation Birmingham Alabama 35211
| | - Donghui Wang
- Medical Device Competence Center, Evonik Corporation Birmingham Alabama 35211
| | - Andrew Wood
- Medical Device Competence Center, Evonik Corporation Birmingham Alabama 35211
| | - Tommy Washington
- Medical Device Competence Center, Evonik Corporation Birmingham Alabama 35211
| | - Kevin Acreman
- Medical Device Competence Center, Evonik Corporation Birmingham Alabama 35211
| | - Brian Cuevas
- Medical Device Competence Center, Evonik Corporation Birmingham Alabama 35211
| | - Andreas Karau
- Business Line Health Science, Evonik Nutrition & Care GmbH Darmstadt 64293 Germany
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11
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The effect of nanoscale surface electrical properties of partially biodegradable PEDOT-co-PDLLA conducting polymers on protein adhesion investigated by atomic force microscopy. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2019; 99:468-478. [DOI: 10.1016/j.msec.2019.01.103] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/11/2018] [Revised: 01/10/2019] [Accepted: 01/23/2019] [Indexed: 11/20/2022]
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12
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Boutry CM, Beker L, Kaizawa Y, Vassos C, Tran H, Hinckley AC, Pfattner R, Niu S, Li J, Claverie J, Wang Z, Chang J, Fox PM, Bao Z. Biodegradable and flexible arterial-pulse sensor for the wireless monitoring of blood flow. Nat Biomed Eng 2019; 3:47-57. [DOI: 10.1038/s41551-018-0336-5] [Citation(s) in RCA: 371] [Impact Index Per Article: 74.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2018] [Accepted: 11/27/2018] [Indexed: 12/20/2022]
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13
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Fang C, Wang X, Chen X, Wang Z. Mild synthesis of environment-friendly thermoplastic triblock copolymer elastomers through combination of ring-opening and RAFT polymerization. Polym Chem 2019. [DOI: 10.1039/c9py00654k] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Environment-friendly thermoplastic triblock copolymer elastomers, polylactide-block-polyisoprene-block-polylactide, were synthesized by a mild ROP and RAFT method.
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Affiliation(s)
- Chu Fang
- CAS Key Laboratory of Soft Matter Chemistry
- Department of Polymer Science and Engineering
- University of Science and Technology of China
- Hefei
- P. R. China
| | - Xuehui Wang
- CAS Key Laboratory of Soft Matter Chemistry
- Department of Polymer Science and Engineering
- University of Science and Technology of China
- Hefei
- P. R. China
| | - Xuesi Chen
- Key Laboratory of Polymer Ecomaterials
- Changchun Institute of Applied Chemistry
- Chinese Academy of Sciences
- Changchun
- China
| | - Zhigang Wang
- CAS Key Laboratory of Soft Matter Chemistry
- Department of Polymer Science and Engineering
- University of Science and Technology of China
- Hefei
- P. R. China
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14
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Duffy P, McMahon S, Wang X, Keaveney S, O'Cearbhaill ED, Quintana I, Rodríguez FJ, Wang W. Synthetic bioresorbable poly-α-hydroxyesters as peripheral nerve guidance conduits; a review of material properties, design strategies and their efficacy to date. Biomater Sci 2019; 7:4912-4943. [DOI: 10.1039/c9bm00246d] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
Implantable tubular devices known as nerve guidance conduits (NGCs) have drawn considerable interest as an alternative to autografting in the repair of peripheral nerve injuries.
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Affiliation(s)
- Patrick Duffy
- The Charles Institute of Dermatology
- School of Medicine
- University College Dublin
- Dublin
- Ireland
| | - Seán McMahon
- Ashland Specialties Ireland Ltd
- Synergy Centre
- Dublin
- Ireland
| | - Xi Wang
- The Charles Institute of Dermatology
- School of Medicine
- University College Dublin
- Dublin
- Ireland
| | - Shane Keaveney
- School of Mechanical & Materials Engineering
- UCD Centre for Biomedical Engineering
- UCD Conway Institute of Biomolecular and Biomedical Research
- University College Dublin
- Dublin
| | - Eoin D. O'Cearbhaill
- School of Mechanical & Materials Engineering
- UCD Centre for Biomedical Engineering
- UCD Conway Institute of Biomolecular and Biomedical Research
- University College Dublin
- Dublin
| | - Iban Quintana
- IK4-Tekniker
- Surface Engineering and Materials Science Unit
- Eibar
- Spain
| | | | - Wenxin Wang
- The Charles Institute of Dermatology
- School of Medicine
- University College Dublin
- Dublin
- Ireland
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15
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Englert C, Brendel JC, Majdanski TC, Yildirim T, Schubert S, Gottschaldt M, Windhab N, Schubert US. Pharmapolymers in the 21st century: Synthetic polymers in drug delivery applications. Prog Polym Sci 2018. [DOI: 10.1016/j.progpolymsci.2018.07.005] [Citation(s) in RCA: 70] [Impact Index Per Article: 11.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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16
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Valverde C, Lligadas G, Ronda JC, Galià M, Cádiz V. Hydrolytic and enzymatic degradation studies of aliphatic 10-undecenoic acid-based polyesters. Polym Degrad Stab 2018. [DOI: 10.1016/j.polymdegradstab.2018.07.012] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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17
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Bolwerk C, Govers LPMWD, Knol H, Oostendorp TF, Brock R. Modeling the Accumulation of Degradable Polymer Drug Carriers in the Brain. ChemMedChem 2018; 13:1308-1310. [PMID: 29750401 DOI: 10.1002/cmdc.201800186] [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: 03/21/2018] [Revised: 05/04/2018] [Indexed: 12/11/2022]
Abstract
The blood-brain barrier (BBB) limits the access of drugs to the brain. Intensive research is being conducted on the development of nanoparticulate drug carriers that mediate transfer across the BBB. A question that has been neglected so far is the potential accumulation of the carrier in the brain upon long-term exposure. Here, we address this question by implementing a kinetic model to relate drug loading, required concentration of drug in the brain, and drug clearance to the degradation half-life of the carrier. As a test case with clinical relevance we chose poly-lactic-co-glycolic-acid (PLGA) as a carrier material and a chemotherapeutic for which the required parameters could be recovered from the literature. For methotrexate with a drug load of 8.5 %, a required concentration of free drug of 1 μm, a release from PLGA of 6 hours, a drug clearance from the brain of 3 hours and a half-life of polymer degradation of 28 days, a steady-state accumulation of 1.3 g polymer would be reached in the brain (1.5 L) after seven months. While this number is surprisingly small, further physiological research is warranted to assess to which degree this will be in a tolerable range.
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Affiliation(s)
- Celine Bolwerk
- Department of Biochemistry, Radboud Institute for Molecular Life Sciences, Radboud University Medical Center, Geert Grooteplein 28, 6525, GA, Nijmegen, The Netherlands
| | - Larissa P M W D Govers
- Department of Biochemistry, Radboud Institute for Molecular Life Sciences, Radboud University Medical Center, Geert Grooteplein 28, 6525, GA, Nijmegen, The Netherlands
| | - Hanna Knol
- Department of Biochemistry, Radboud Institute for Molecular Life Sciences, Radboud University Medical Center, Geert Grooteplein 28, 6525, GA, Nijmegen, The Netherlands
| | - Thom F Oostendorp
- Department of Cognitive Neuroscience, Donders Institute for Brain, Cognition and Behaviour, Radboud University Medical Center, 6525, EN, Nijmegen, The Netherlands
| | - Roland Brock
- Department of Biochemistry, Radboud Institute for Molecular Life Sciences, Radboud University Medical Center, Geert Grooteplein 28, 6525, GA, Nijmegen, The Netherlands
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18
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Surgical suture braided with a diclofenac-loaded strand of poly(lactic-co-glycolic acid) for local, sustained pain mitigation. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2017. [DOI: 10.1016/j.msec.2017.05.024] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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19
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Syntheses and thermal properties of polyesters bearing a carbosilane repeating unit. Polym Bull (Berl) 2017. [DOI: 10.1007/s00289-016-1834-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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20
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Zhang W, Douglas JF, Starr FW. Dynamical heterogeneity in a vapor-deposited polymer glass. J Chem Phys 2017; 146:203310. [DOI: 10.1063/1.4976542] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022] Open
Affiliation(s)
- Wengang Zhang
- Department of Physics, Wesleyan University, Middletown, Connecticut 06459-0155, USA
| | - Jack F. Douglas
- Materials Science and Engineering Division, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, USA
| | - Francis W. Starr
- Department of Physics, Wesleyan University, Middletown, Connecticut 06459-0155, USA
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Lakkireddy HR, Bazile D. Building the design, translation and development principles of polymeric nanomedicines using the case of clinically advanced poly(lactide(glycolide))-poly(ethylene glycol) nanotechnology as a model: An industrial viewpoint. Adv Drug Deliv Rev 2016; 107:289-332. [PMID: 27593265 DOI: 10.1016/j.addr.2016.08.012] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2016] [Revised: 08/19/2016] [Accepted: 08/27/2016] [Indexed: 12/16/2022]
Abstract
The design of the first polymeric nanoparticles could be traced back to the 1970s, and has thereafter received considerable attention, as evidenced by the significant increase of the number of articles and patents in this area. This review article is an attempt to take advantage of the existing literature on the clinically tested and commercialized biodegradable PLA(G)A-PEG nanotechnology as a model to propose quality building and outline translation and development principles for polymeric nano-medicines. We built such an approach from various building blocks including material design, nano-assembly - i.e. physicochemistry of drug/nano-object association in the pharmaceutical process, and release in relevant biological environment - characterization and identification of the quality attributes related to the biopharmaceutical properties. More specifically, as envisaged in a translational approach, the reported data on PLA(G)A-PEG nanotechnology have been structured into packages to evidence the links between the structure, physicochemical properties, and the in vitro and in vivo performances of the nanoparticles. The integration of these bodies of knowledge to build the CMC (Chemistry Manufacturing and Controls) quality management strategy and finally support the translation to proof of concept in human, and anticipation of the industrialization takes into account the specific requirements and biopharmaceutical features attached to the administration route. From this approach, some gaps are identified for the industrial development of such nanotechnology-based products, and the expected improvements are discussed. The viewpoint provided in this article is expected to shed light on design, translation and pharmaceutical development to realize their full potential for future clinical applications.
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Fanchiotti BG, Machado MPZ, de Paula LC, Durmuş M, Nyokong T, da Silva Gonçalves A, da Silva AR. The photobleaching of the free and encapsulated metallic phthalocyanine and its effect on the photooxidation of simple molecules. JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY B-BIOLOGY 2016; 165:10-23. [PMID: 27755995 DOI: 10.1016/j.jphotobiol.2016.10.007] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/02/2016] [Revised: 09/06/2016] [Accepted: 10/10/2016] [Indexed: 11/25/2022]
Abstract
The photobleaching of an unsubstituted phthalocyanine (gallium(III) phthalocyanine chloride (GaPc)) and a substituted phthalocyanine (1,4-(tetrakis[4-(benzyloxy)phenoxy]phthalocyaninato) indium(III) chloride (InTBPPc)) was monitored for the free photosensitizers and for the phthalocyanines encapsulated into nanoparticles of PEGylated poly(D,L-lactide-co-glycolide) (PLGA-PEG). Phosphate-buffered solutions (PBS) and organic solutions of the free GaPc or the free InTBPPc, and suspensions of each encapsulated photosensitizer (2-15μmol/L) were irradiated using a laser diode of 665nm with a power of 1-104mW and a light dose of 7.5J/cm2. The relative absorbance (RA) of the free GaPc dissolved in 1-methyl-2-pyrrolidone (MP) decreased 8.4 times when the laser power increased from 1mW to 104mW. However, the free or encapsulated GaPc did not suffer the photobleaching in PBS solution. The RA values decreased 2.4 times and 22.2 times for the free InTBPPc dissolved in PBS solution and in dimethylformamide (DMF), respectively, but the encapsulated InTBPPc was only photobleached when the laser power was 104mW at 8μmol/L. The increase of the free GaPc concentration favored the photobleaching in MP until 8μmol/L while the increase from 2μmol/L to 5μmol/L reduced the photodegradation in PBS solution. However, the photobleaching of the free InTBPPc in DMF or in PBS solution, and of each encapsulated photosensitizer was not influenced by increasing the concentration. The influence of the photobleaching on the capability of the free and encapsulated GaPc and InTBPPc to photooxidate the simple molecules was investigated monitoring the fluorescence of dimethylanthracene (DMA) and the tryptophan (Trp). Free InTBPPc was 2.0 and 1.8 times faster to photooxidate the DMA and Trp than it was the free GaPc, but the encapsulated GaPc was 3.4 times more efficient to photooxidize the Trp than it was the encapsulated InTBPPc due to the photodegradation suffered by the encapsulated InTBPPc. The participation of the singlet oxygen was confirmed with the sodium azide in the photobleaching of all free and encapsulated photosensitizer, and in the photooxidation of the DMA and Trp. The asymmetry of InTBPPc increased the solubility of the free compound, decreasing the aggregation state of the photosensitizer and favoring the photobleaching process. The encapsulation shows capability in decreasing the photobleaching of both photosensitizers but the confocal micrographs showed that the increase of the solubility favored the InTBPPc photobleaching during the acquisition of optical cross section.
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Affiliation(s)
| | | | | | - Mahmut Durmuş
- Gebze Technical University, Department of Chemistry, PO Box 141, Gebze 41400, Turkey
| | - Tebello Nyokong
- Rhodes University, Department of Chemistry, PO Box 94, Grahamstown 6140, South Africa
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Ponsart S, Coudane J, McGrath J, Vert M. Study of the Grafting of Bromoacetylated α-Hydroxy-ω-Methoxypoly(Ethyleneglycol) onto Anionically Activated Poly(∊-Caprolactone). J BIOACT COMPAT POL 2016. [DOI: 10.1177/088391102030911] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Bromoacetylated α-hydroxy-ω methoxy-poly (ethyleneglycol) (Mn = 2000 g mol−1) was allowed to react with a poly(∊ caprolactone) (Mn = 53,700, Mw/Mn =(1.50) that was first activatedby removing some of the proton atoms borne by the carbon atoms locatedin -position of carbonyl groups using lithium N-N-diisopropylamide as basic reagent in tetrahydrofurane at 78°C under argon flow. The reaction resulted in the grafting of methoxy poly(ethylene glycol) segments to some of the poly("-caprolactone) chains. The resulting polymeric compounds were characterized by various analytical techniques including NMR, SEC, DSC, X-ray diffraction and contact angle. Various characteristics of the recovered compounds, namely degree of substitution, degree of crystallinity, glass transition and melting temperatures, hydrophilicity, were evaluated. It was concluded that grafting was effective but sometimes not all poly("-caprolactone) chains were modified, depending on experimental conditions. Moreover, 150 nm nanoparticles were obtained without any additional surfactant for a 0.74% substitution degree copolymer.
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Affiliation(s)
- Stéphanie Ponsart
- CRBA, UMR CNRS 5473, Faculty of Pharmacy, 15 avenue Charles Flahault, 34060 Montpellier, France
| | - Jean Coudane
- CRBA, UMR CNRS 5473, Faculty of Pharmacy, 15 avenue Charles Flahault, 34060 Montpellier, France
| | | | - Michel Vert
- CRBA, UMR CNRS 5473, Faculty of Pharmacy, 15 avenue Charles Flahault, 34060 Montpellier, France
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Xichen Zhang, Wyss UP, Pichora D, Goosen MF. An Investigation of Poly(lactic acid) Degradation. J BIOACT COMPAT POL 2016. [DOI: 10.1177/088391159400900105] [Citation(s) in RCA: 90] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
To elucidate the degradation mechanism of poly(lactic acid), the decrease in the intrinsic viscosity of poly(D,L-lactide) in a homogeneous water/ acetone solution was investigated. The hydrolysis of poly(D,L-lactic acid) in water/acetone solution can be catalyzed by protons. The molecular weight degradation of solid poly(D,L-lactic acid) in water was primarily affected by the degree of polymer purity. Polymerization conditions such as initiator concen tration, temperature and time did not have an obvious effect on the molecular weight degradation. In the case of polymer samples with low purity (i.e., directly polymerized or containing solvent or oligomer), degradation was ini tially very rapid. On the other hand, initial degradation of purified polymer was very slow before accelerating.
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Affiliation(s)
- Xichen Zhang
- Queen's University Kingston, Ontario, Canada K7L 3N6
| | - Urs P. Wyss
- Queen's University Kingston, Ontario, Canada K7L 3N6
| | - David Pichora
- Queen's University Kingston, Ontario, Canada K7L 3N6
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Ranne T, Tirri T, Yli-Urpo A, Närhi T, Laine V, Rich J, Seppälä J, Aho A. In Vivo Behavior of Poly(∈-Caprolactone-co-DL-Lactide)/Bioactive Glass Composites in Rat Subcutaneous Tissue. J BIOACT COMPAT POL 2016. [DOI: 10.1177/0883911507078270] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
In this study, tissue reactions and possible toxicological responses of two different bioactive and degradable composite materials consisting of poly( ∈-caprolactone-co-DL-lactide) and bioactive glass (S53P4) granules were evaluated. The chosen materials were implanted subcutaneously in the back of rats for six months. The glass granules retained their bioactivity within the polymer matrices. A fibrous capsule formed around all tested materials and around the materials containing bioactive glass the fibrous capsules appeared to be thicker. Tissue growth into these materials was observed during the healing period while no growth was noticed into the plain polymer matrices. No adverse reactions were seen with any of the evaluated materials.
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Affiliation(s)
- T. Ranne
- Department of Prosthetic Dentistry and Biomaterials Science
| | - T. Tirri
- Department of Prosthetic Dentistry and Biomaterials Science,
| | - A. Yli-Urpo
- Department of Prosthetic Dentistry and Biomaterials Science
| | - T.O. Närhi
- Department of Prosthetic Dentistry and Biomaterials Science
| | - V.J.O. Laine
- Department of Pathology, University of Turku, Turku 20520, Finland
| | - J. Rich
- Department of Chemical Technology, Helsinki University of Technology, Espoo 02150, Finland
| | - J. Seppälä
- Department of Chemical Technology, Helsinki University of Technology, Espoo 02150, Finland
| | - A. Aho
- Department of Surgery, University of Turku, Turku 20520, Finland
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26
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Kishida A, Murakami K, Goto H, Akashi M, Kubota H, Endo T. Polymer Drugs and Polymeric Drugs X: Slow Release of 5-Fluorouracil from Biodegradable Poly(γ-Glutamic Acid) and its Benzyl Ester Matrices. J BIOACT COMPAT POL 2016. [DOI: 10.1177/088391159801300403] [Citation(s) in RCA: 42] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
We prepared poly(γ-glutamic acid)(γ-PGA) benzyl ester(γ-PBG) by the esterification of γ-PGA and benzyl bromide and evaluated the degradation behavior and its usefulness as a drug delivery system (DDS) matrix using 5-fluorouracil (5-FU) as a model drug. γ-PBG degraded in an acidic solution gradually for up to 130 days, and degraded very slowly in a phosphate buffer solution (pH 7.4). After 150 days, the weight loss of the γ-PBG film was only 10% in a phosphate buffer solution. A slow release of 5-FU from γ-PBG films was achieved. The release rate was affected by the pH of the outer solution and the loading drug. We observed an initial burst-release on the first day, after that, the release of 5-FU was diffusion-controlled. γ-PBG may be a novel biodegradable material that may be useful in the pharmaceutical, biomedical, and agricultural fields.
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Affiliation(s)
- Akio Kishida
- Department of Applied Chemistry and Chemical Engineering, Faculty of Engineering, Kagoshima University, 1-21-40, Korimoto, Kagoshima 890-0065, Japan
| | - Kazunori Murakami
- Department of Applied Chemistry and Chemical Engineering, Faculty of Engineering, Kagoshima University, 1-21-40, Korimoto, Kagoshima 890-0065, Japan
| | - Hidetada Goto
- Department of Applied Chemistry and Chemical Engineering, Faculty of Engineering, Kagoshima University, 1-21-40, Korimoto, Kagoshima 890-0065, Japan
| | - Mitsuru Akashi
- Department of Applied Chemistry and Chemical Engineering, Faculty of Engineering, Kagoshima University, 1-21-40, Korimoto, Kagoshima 890-0065, Japan
| | - Hidetoshi Kubota
- Meiji Seika Kaisya Co. Ltd., Pharmaceutical Technology Laboratory, Kayama 788, Odawara-shi 250-0000, Japan
| | - Takeshi Endo
- Research Laboratory of Resources Utilization, Tokyo Institute of Technology, Nagatsuta-cho 4259, Midori-ku, Yokohama 226-8503, Japan
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27
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Mahfoudh J, Salhi S, Delaite C, Abid S, El Gharbi R. Random Poly(Lactic Acid-co-β-Alanine): Synthesis and Characterizations. JOURNAL OF MACROMOLECULAR SCIENCE PART A-PURE AND APPLIED CHEMISTRY 2015. [DOI: 10.1080/10601325.2015.1095603] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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28
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Kunduru KR, Basu A, Haim Zada M, Domb AJ. Castor Oil-Based Biodegradable Polyesters. Biomacromolecules 2015; 16:2572-87. [DOI: 10.1021/acs.biomac.5b00923] [Citation(s) in RCA: 96] [Impact Index Per Article: 10.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Konda Reddy Kunduru
- Department of Medicinal Chemistry
and Natural Products, Institute for Drug Research, School of Pharmacy,
Faculty of Medicine, The Hebrew University of Jerusalem, Jerusalem 91120, Israel
| | - Arijit Basu
- Department of Medicinal Chemistry
and Natural Products, Institute for Drug Research, School of Pharmacy,
Faculty of Medicine, The Hebrew University of Jerusalem, Jerusalem 91120, Israel
| | - Moran Haim Zada
- Department of Medicinal Chemistry
and Natural Products, Institute for Drug Research, School of Pharmacy,
Faculty of Medicine, The Hebrew University of Jerusalem, Jerusalem 91120, Israel
| | - Abraham J. Domb
- Department of Medicinal Chemistry
and Natural Products, Institute for Drug Research, School of Pharmacy,
Faculty of Medicine, The Hebrew University of Jerusalem, Jerusalem 91120, Israel
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Synthesis of Hyperbranched Poly(ε-caprolactone) Containing Terminal Azobenzene Structure via Combined Ring-Opening Polymerization and “Click” Chemistry. Polymers (Basel) 2015. [DOI: 10.3390/polym7071248] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
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30
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Silk fibroin nanoparticle as a novel drug delivery system. J Control Release 2015; 206:161-76. [DOI: 10.1016/j.jconrel.2015.03.020] [Citation(s) in RCA: 242] [Impact Index Per Article: 26.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2015] [Revised: 03/17/2015] [Accepted: 03/18/2015] [Indexed: 01/12/2023]
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31
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Malwela T, Ray SS. Enzymatic degradation behavior of nanoclay reinforced biodegradable PLA/PBSA blend composites. Int J Biol Macromol 2015; 77:131-42. [PMID: 25797405 DOI: 10.1016/j.ijbiomac.2015.03.018] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2014] [Revised: 02/26/2015] [Accepted: 03/09/2015] [Indexed: 10/23/2022]
Abstract
Films of a biodegradable PLA/PBSA blend and blend-composites containing 2wt% of C20A, C30B and MEE were prepared by solvent casting and spin coating. The films were incubated in vials containing Tris-HCl buffer with Proteinase K, and their weight losses were measured after enzymatic degradation. The surface morphology before and after degradation tests was studied by SEM and in situ AFM. The results showed that neat PLA had a lower percentage weight loss than neat PBSA, whereas blending them resulted in an increased weight loss. The incorporation of C20A into the as-prepared blend accelerated the degradation rate, whereas C30B and MEE decelerated the degradation rate. Annealing at 70°C reduced the degradation rate of the blend, and the presence of nanoclays further reduced the degradation rates. Annealing at 120°C dramatically decelerated the degradation of the blend, whereas the incorporation of nanoclays accelerated the degradations rates. The enhancement of the degradation rates in the presence of nanoclays indicated that the degradation rates were mainly controlled by the PLA matrix. Thin films were also cast onto a silicon substrate using a spin coater, and enzymatic degradation on the completely crystalline surfaces revealed that enzymatic attack occurred by pitting and surface erosion of the thin films.
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Affiliation(s)
- Thomas Malwela
- DST/CSIR National Centre for Nanostructured Materials, Council for Scientific and Industrial Research, Pretoria 0001, South Africa; Department of Applied Chemistry, University of Johannesburg, Doornfontein 2028, Johannesburg, South Africa
| | - Suprakas Sinha Ray
- DST/CSIR National Centre for Nanostructured Materials, Council for Scientific and Industrial Research, Pretoria 0001, South Africa; Department of Applied Chemistry, University of Johannesburg, Doornfontein 2028, Johannesburg, South Africa.
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Taheri S, Baier G, Majewski P, Barton M, Förch R, Landfester K, Vasilev K. Synthesis and surface immobilization of antibacterial hybrid silver-poly(l-lactide) nanoparticles. NANOTECHNOLOGY 2014; 25:305102. [PMID: 25007946 DOI: 10.1088/0957-4484/25/30/305102] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Infections associated with medical devices are a substantial healthcare problem. Consequently, there has been increasing research and technological efforts directed toward the development of coatings that are capable of preventing bacterial colonization of the device surface. Herein, we report on novel hybrid silver loaded poly(L-lactic acid) nanoparticles (PLLA-AgNPs) with narrowly distributed sizes (17 ± 3 nm) prepared using a combination of solvent evaporation and mini-emulsion technology. These particles were then immobilized onto solid surfaces premodified with a thin layer of allylamine plasma polymer (AApp). The antibacterial efficacy of the PLLA-AgNPs nanoparticles was studied in vitro against both gram-positive (Staphylococcus epidermidis) and gram-negative (Escherichia coli) bacteria. The minimal inhibitory concentration values against Staphylococcus epidermidis and Escherichia coli were 0.610 and 1.156 μg · mL(-1), respectively. The capacity of the prepared coatings to prevent bacterial surface colonization was assessed in the presence of Staphylococcus epidermidis, which is a strong biofilm former that causes substantial problems with medical device associated infections. The level of inhibition of bacterial growth was 98%. The substrate independent nature and the high antibacterial efficacy of coatings presented in this study may offer new alternatives for antibacterial coatings for medical devices.
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Affiliation(s)
- Shima Taheri
- School of Engineering, University of South Australia, Mawson Lakes, SA 5095 Australia
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Lai P, Daear W, Löbenberg R, Prenner EJ. Overview of the preparation of organic polymeric nanoparticles for drug delivery based on gelatine, chitosan, poly(d,l-lactide-co-glycolic acid) and polyalkylcyanoacrylate. Colloids Surf B Biointerfaces 2014; 118:154-63. [DOI: 10.1016/j.colsurfb.2014.03.017] [Citation(s) in RCA: 123] [Impact Index Per Article: 12.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2013] [Revised: 02/13/2014] [Accepted: 03/09/2014] [Indexed: 11/30/2022]
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34
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Sirousazar M, Forough M, Farhadi K, Shaabani Y, Molaei R. Hydrogels: Properties, Preparation, Characterization and Biomedical, Applications in Tissue Engineering, Drug, Delivery and Wound Care. Adv Healthc Mater 2014. [DOI: 10.1002/9781118774205.ch9] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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35
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Pasupuleti S, Avadanam A, Madras G. Synthesis, characterization, and degradation of biodegradable poly(mannitol citric dicarboxylate) copolyesters. POLYM ENG SCI 2014. [DOI: 10.1002/pen.21965] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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36
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Shubhra QTH, Tóth J, Gyenis J, Feczkó T. Poloxamers for Surface Modification of Hydrophobic Drug Carriers and Their Effects on Drug Delivery. POLYM REV 2014. [DOI: 10.1080/15583724.2013.862544] [Citation(s) in RCA: 47] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
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37
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Controlled Synthesis and Processing of a Poly(L-lactide- co-ε-caprolactone) Copolymer for Biomedical Use as an Absorbable Monofilament Surgical Suture. ACTA ACUST UNITED AC 2014. [DOI: 10.4028/www.scientific.net/amr.894.172] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Poly (L-lactide-co-ε-caprolactone) 75:25 % mol, P(LL-co-CL), was synthesized via bulk ring-opening polymerisation (ROP) using a novel tin (II) alkoxide initiator, [Sn (Oct)]2DEG, at 130°C for 48 hrs. The effectiveness of this initiator was compared withthe well-known conventional tin (II) octoateinitiator, Sn (Oct)2. The P(LL-co-CL) copolymersobtained were characterized using a combination of analytical technique including: nuclear magnetic resonance spectroscopy (NMR), differential scanning calorimetry (DSC), thermogravimetry (TG) and gel permeation chromatography (GPC). The P(LL-co-CL) was melt-spun into monofilament fibres of uniform diameter and smooth surface appearance. Modification of the matrix morphology was then built into the as-spun fibresvia a series of controlled off-line annealing and hot-drawing steps.
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Baier G, Cavallaro A, Friedemann K, Müller B, Glasser G, Vasilev K, Landfester K. Enzymatic degradation of poly(l-lactide) nanoparticles followed by the release of octenidine and their bactericidal effects. NANOMEDICINE-NANOTECHNOLOGY BIOLOGY AND MEDICINE 2014; 10:131-9. [DOI: 10.1016/j.nano.2013.07.002] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/30/2013] [Revised: 06/07/2013] [Accepted: 07/05/2013] [Indexed: 10/26/2022]
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39
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Liu X, Su S, Wei F, Rong X, Yang Z, Liu J, Li M, Wu Y. Construction of nanoparticles based on amphiphilic copolymers of poly(γ-glutamic acid co-l-lactide)-1,2-dipalmitoyl-sn-glycero-3-phosphoethanolamine as a potential drug delivery carrier. J Colloid Interface Sci 2014; 413:54-64. [DOI: 10.1016/j.jcis.2013.09.022] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2013] [Revised: 09/04/2013] [Accepted: 09/09/2013] [Indexed: 01/09/2023]
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40
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41
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Lee JT, Han JK. Sinus implants for chronic rhinosinusitis: technology evaluation. Expert Opin Drug Deliv 2013; 10:1735-48. [DOI: 10.1517/17425247.2013.839654] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
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Weiser JR, Yueh A, Putnam D. Protein release from dihydroxyacetone-based poly(carbonate ester) matrices. Acta Biomater 2013; 9:8245-53. [PMID: 23747318 DOI: 10.1016/j.actbio.2013.05.020] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2013] [Revised: 05/11/2013] [Accepted: 05/22/2013] [Indexed: 11/19/2022]
Abstract
The release of therapeutics from solid polymer matrices is an important field of study in the area of controlled release. Here we report on the hydrolytic degradation of directly compressed discs comprised of statistically random polycarbonate esters based on lactic acid and dihydroxyacetone. The controlled release of two model proteins, bovine serum albumin and lysozyme, was explored using two percentage loadings (5 and 10 wt.%). A first order release pattern and a trend for faster protein release with increasing dihydroxyacetone content were observed over a time period ranging from 2.5 to 70 days. To analyze the effects of the internal polymer matrix environment on protein stability the enzymatic activity of released lysozyme was monitored. The results show a high level of enzyme activity for the polycarbonate ester ratios with more dihydroxyacetone in the backbone and at least 50% activity over the first month of release from the co-polymer ratios with more lactic acid in the backbone. Modeling of the release kinetics using the Korsmeyer-Peppas model showed a high correlation, indicating that the release of protein is a complex mechanism controlled by protein diffusion through, and erosion of, the co-polymer matrix. The outcomes show that these polycarbonate esters may be useful materials for extended controlled release of proteins.
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Affiliation(s)
- Jennifer R Weiser
- Department of Biomedical Engineering, Cornell University, 526 Campus Road, Ithaca, NY 14853, USA
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Chen C, Gao Z, Qiu X, Hu S. Enhancement of the controlled-release properties of chitosan membranes by crosslinking with suberoyl chloride. Molecules 2013; 18:7239-52. [PMID: 23783458 PMCID: PMC6270360 DOI: 10.3390/molecules18067239] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2013] [Revised: 06/07/2013] [Accepted: 06/17/2013] [Indexed: 11/29/2022] Open
Abstract
A novel crosslinking agent, suberoyl chloride, was used to crosslink N-phthaloyl acylated chitosan and improves the properties of chitosan membranes. Membranes with different crosslinking degrees were synthesized. The derivatives were characterized by Fourier transform infrared spectroscopy and ¹³C solid state nuclear magnetic resonance spectroscopy, which indicated that the crosslinking degrees ranged from 0 to 7.4%. The permeabilities of various plant nutrients, including macroelements (N, P, K), microelements (Zn²⁺ and Cu²⁺), and a plant growth regulator (naphthylacetic acid), were varied by moderate changes in crosslinking degree, indicating that the controlled-release properties can be regulated in this way. The film-forming ability of native chitosan was maintained, whilst mechanical properties, hydrophobicity and controlled permeability were improved. These dramatic improvements occurred with a small amount of added suberoyl chloride; excessive crosslinking led to membranes with unwanted poor permeability. Thus, both the mechanical properties and permeability of the crosslinked membrane can be optimized.
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Affiliation(s)
| | | | | | - Shuwen Hu
- Department of Environmental Sciences & Engineering, College of Resources & Environmental Sciences, China Agricultural University, Beijing 100193, China; E-Mails: (C.C.); (Z.G.); (X.Q.)
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Varvarenko S, Tarnavchyk I, Voronov A, Fihurka N, Dron I, Nosova N, Taras R, Samaryk V, Voronov S. Synthesis and Colloidal Properties of Polyesters Based on Glutamic Acids and Glycols of Different Nature. CHEMISTRY & CHEMICAL TECHNOLOGY 2013. [DOI: 10.23939/chcht07.02.161] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Briggs T, Arinzeh TL. Examining the formulation of emulsion electrospinning for improving the release of bioactive proteins from electrospun fibers. J Biomed Mater Res A 2013; 102:674-84. [DOI: 10.1002/jbm.a.34730] [Citation(s) in RCA: 59] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2012] [Revised: 03/05/2013] [Accepted: 03/20/2013] [Indexed: 12/17/2022]
Affiliation(s)
- Tonye Briggs
- Department of Biomedical Engineering; New Jersey Institute of Technology; University Heights; 614 Fenster Hall Newark New Jersey 07102
| | - Treena Livingston Arinzeh
- Department of Biomedical Engineering; New Jersey Institute of Technology; University Heights; 614 Fenster Hall Newark New Jersey 07102
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Song JE, Kim MJ, Yoon H, Yoo H, Lee YJ, Kim HN, Lee D, Yuk SH, Khang G. Effect of hyaluronic acid (HA) in a HA/PLGA scaffold on annulus fibrosus regeneration: In vivo tests. Macromol Res 2013. [DOI: 10.1007/s13233-013-1137-z] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
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Nano-encapsulation of vitamin D3 active metabolites for application in chemotherapy: formulation study and in vitro evaluation. Pharm Res 2012; 30:1137-46. [PMID: 23225028 DOI: 10.1007/s11095-012-0949-4] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2012] [Accepted: 11/27/2012] [Indexed: 12/21/2022]
Abstract
PURPOSE Calcitriol (1,25-dihydroxyvitamin D3), the active metabolite of vitamin D3, is a potential anticancer agent but with high risk of hypercalcemia which limits the achievement of effective serum concentrations. Thus, calcitriol targeting delivery by nanoparticles may present a good solution. METHODS Vitamin D3 active metabolites were encapsulated into polymeric nanoparticles and different formulation parameters were tested. The growth inhibitory efficiency of these nanoparticles was carried out in vitro on human breast adenocarinoma cells (MCF-7). RESULTS Using cholecalciferol (the inactive metabolite), different polymer and oil ratios were compared to select nanoparticles presenting high encapsulation efficiency and sustained release profile. Calcidiol/calcitriol loaded nanoparticles had good encapsulation efficiencies (around 90%) associated with sustained releases over 7 days and enhanced stability. Moreover, loaded nanoparticles showed similar growth inhibition to non-encapsulated metabolites of vitamin D3 on day 4 and higher activities on days 7 and 10 after treatment initiation. CONCLUSION The nano-encapsulation of vitamin D3 active metabolites may offer a new and potentially effective strategy for vitamin D3-based chemotherapy overcoming its actual limitations. The targeting delivery of vitamin D3 metabolites should be encouraged.
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Barrett C, Cameron R, Best S. Bioceramic and Biopolymer Nanocomposite Materials for Use in Orthopedic Applications. Tissue Eng Regen Med 2012. [DOI: 10.1201/b13049-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022] Open
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Vallittu P. Biostable Composite Biomaterials in Medical Applications. Tissue Eng Regen Med 2012. [DOI: 10.1201/b13049-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022] Open
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