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Song Q, Wang D, Li H, Wang Z, Sun S, Wang Z, Liu Y, Lin S, Li G, Zhang S, Zhang P. Dual-response of multi-functional microsphere system to ultrasound and microenvironment for enhanced bone defect treatment. Bioact Mater 2024; 32:304-318. [PMID: 37876555 PMCID: PMC10590728 DOI: 10.1016/j.bioactmat.2023.10.007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2023] [Revised: 09/21/2023] [Accepted: 10/07/2023] [Indexed: 10/26/2023] Open
Abstract
Using bone tissue engineering strategies to achieve bone defect repair is a promising modality. However, the repair process outcomes are often unsatisfactory. Here we properly designed a multi-functional microsphere system, which could deliver bioactive proteins under the dual response of ultrasound and microenvironment, release microenvironment-responsive products on demand, reverse bone injury microenvironment, regulate the immune microenvironment, and achieve excellent bone defect treatment outcomes. In particular, the MnO2 introduced into the poly(lactic-co-glycolic acid) (PLGA) microspheres during synthesis could consume the acid produced by the degradation of PLGA to protect bone morphogenetic protein-2 (BMP-2). More importantly, MnO2 could consume reactive oxygen species (ROS) and produce Mn2+ and oxygen (O2), further promoting the repair of bone defects while reversing the microenvironment. Moreover, the reversal of the bone injury microenvironment and the depletion of ROS promoted the polarization of M1 macrophages to M2 macrophages, and the immune microenvironment was regulated. Notably, the ultrasound (US) irradiation used during treatment also allowed the on-demand release of microenvironment-responsive products. The multi-functional microsphere system combines the effects of on-demand delivery, reversal of bone injury microenvironment, and regulation of the immune microenvironment, providing new horizons for the clinical application of protein delivery and bone defect repair.
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Affiliation(s)
- Qingxu Song
- Department of Spine Surgery, The First Hospital of Jilin University, Changchun, 130021, China
- Key Laboratory of Polymer Ecomaterials, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, 130022, China
| | - Dianwei Wang
- Key Laboratory of Polymer Ecomaterials, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, 130022, China
| | - Haoyu Li
- Department of Spine Surgery, The First Hospital of Jilin University, Changchun, 130021, China
- Key Laboratory of Polymer Ecomaterials, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, 130022, China
| | - Zongliang Wang
- Key Laboratory of Polymer Ecomaterials, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, 130022, China
| | - Songjia Sun
- Department of Dermatology, Second Hospital of Jilin University, Changchun, 130022, China
| | - Zhenyu Wang
- Department of Spine Surgery, The First Hospital of Jilin University, Changchun, 130021, China
| | - Yi Liu
- Department of Spine Surgery, The First Hospital of Jilin University, Changchun, 130021, China
| | - Sien Lin
- Department of Orthopaedics and Traumatology and Li Ka Shing Institute of Health Sciences, Prince of Wales Hospital, The Chinese University of Hong Kong, Shatin, Hong Kong Special Administrative Region of China
| | - Gang Li
- Department of Orthopaedics and Traumatology and Li Ka Shing Institute of Health Sciences, Prince of Wales Hospital, The Chinese University of Hong Kong, Shatin, Hong Kong Special Administrative Region of China
| | - Shaokun Zhang
- Department of Spine Surgery, The First Hospital of Jilin University, Changchun, 130021, China
| | - Peibiao Zhang
- Key Laboratory of Polymer Ecomaterials, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, 130022, China
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Safari H, Felder ML, Kaczorowski N, Eniola-Adefeso O. Effect of the Emulsion Solvent Evaporation Technique Cosolvent Choice on the Loading Efficiency and Release Profile of Anti-CD47 from PLGA nanospheres. J Pharm Sci 2022; 111:2525-2530. [DOI: 10.1016/j.xphs.2022.04.007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2021] [Revised: 04/09/2022] [Accepted: 04/09/2022] [Indexed: 11/28/2022]
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Otte A, Damen F, Goergen C, Park K. Coupling the in vivo performance to the in vitro characterization of PLGA microparticles. Int J Pharm 2021; 604:120738. [PMID: 34048931 DOI: 10.1016/j.ijpharm.2021.120738] [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] [Received: 11/16/2020] [Revised: 05/18/2021] [Accepted: 05/23/2021] [Indexed: 12/12/2022]
Abstract
The main objective of the study was to determine if rodent housing conditions, specifically housing climate, could impact the in vivo performance of poly(lactide-co-glycolide) (PLGA) microspheres through temperature modification of the subcutaneous space. Vivitrol®, a once monthly naltrexone injectable suspension, was chosen as a model PLGA microparticle formulation for this study. Two lots of Vivitrol were used to ascertain any potential differences that may exist between the batches and if in vitro characterization techniques could delineate any variation(s). The pharmacokinetics of the naltrexone-PLGA microparticles were determined in the rodent model under two different housing climates (20 vs. 25 °C). The results demonstrate that such difference in housing temperature resulted in a change in subcutaneous temperature but actually within a narrow range (36.31-36.77 °C) and thus minimally influenced the in vivo performance of subcutaneously injected microparticles. The shake-flask method was used to characterize the in vitro release at 35, 36, and 37 °C and demonstrated significant differences in the in vitro release profiles across this range of temperatures. Minimal differences in the in vitro characterization of the two lots were found. While these results did not provide statistical significance, the local in vivo temperature may be a parameter that should be considered when evaluating microparticle performance. The IVIVCs demonstrate that in vitro release at 37 °C may not accurately represent the in vivo conditions (i.e., subcutaneous space in rodents), and in certain instances lower in vitro release temperatures may more accurately represent the in vivo microenvironment and provide better correlations. Future studies will determine the extent temperature and specifically co-housing, may have on the relative impact of the in vivo performance of injectable polymeric microparticles based upon the significant differences observed in the in vitro release profiles across the range of 35-37 °C.
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Affiliation(s)
- Andrew Otte
- Purdue University, Weldon School of Biomedical Engineering, West Lafayette, IN 47907, USA.
| | - Frederick Damen
- Purdue University, Weldon School of Biomedical Engineering, West Lafayette, IN 47907, USA
| | - Craig Goergen
- Purdue University, Weldon School of Biomedical Engineering, West Lafayette, IN 47907, USA
| | - Kinam Park
- Purdue University, Weldon School of Biomedical Engineering, West Lafayette, IN 47907, USA; Purdue University, Department of Pharmaceutics, West Lafayette, IN 47907, USA
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Visan AI, Popescu-Pelin G, Socol G. Degradation Behavior of Polymers Used as Coating Materials for Drug Delivery-A Basic Review. Polymers (Basel) 2021; 13:1272. [PMID: 33919820 PMCID: PMC8070827 DOI: 10.3390/polym13081272] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2021] [Revised: 04/03/2021] [Accepted: 04/08/2021] [Indexed: 12/21/2022] Open
Abstract
The purpose of the work was to emphasize the main differences and similarities in the degradation mechanisms in the case of polymeric coatings compared with the bulk ones. Combined with the current background, this work reviews the properties of commonly utilized degradable polymers in drug delivery, the factors affecting degradation mechanism, testing methods while offering a retrospective on the evolution of the controlled release of biodegradable polymeric coatings. A literature survey on stability and degradation of different polymeric coatings, which were thoroughly evaluated by different techniques, e.g., polymer mass loss measurements, surface, structural and chemical analysis, was completed. Moreover, we analyzed some shortcomings of the degradation behavior of biopolymers in form of coatings and briefly proposed some solving directions to the main existing problems (e.g., improving measuring techniques resolution, elucidation of complete mathematical analysis of the different degradation mechanisms). Deep studies are still necessary on the dynamic changes which occur to biodegradable polymeric coatings which can help to envisage the future performance of synthesized films designed to be used as medical devices with application in drug delivery.
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Affiliation(s)
- Anita Ioana Visan
- Lasers Department, National Institute for Lasers, Plasma and Radiation Physics, 077190 Magurele, Ilfov, Romania;
| | | | - Gabriel Socol
- Lasers Department, National Institute for Lasers, Plasma and Radiation Physics, 077190 Magurele, Ilfov, Romania;
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Wang S, Feng X, Liu P, Wei Y, Xiao B. Blending of PLGA-PEG-PLGA for Improving the Erosion and Drug Release Profile of PCL Microspheres. Curr Pharm Biotechnol 2020; 21:1079-1087. [PMID: 31893987 DOI: 10.2174/1389201021666200101104116] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2019] [Revised: 12/10/2019] [Accepted: 12/26/2019] [Indexed: 11/22/2022]
Abstract
BACKGROUND PCL has a long history as an industrialized biomaterial for preparing microspheres, but its hydrophobic property and slow degradation rate often cause drug degeneration, quite slow drug release rate and undesirable tri-phasic release profile. MATERIALS AND METHODS In this study, we used the blending material of PLGA-PEG-PLGA and PCL to prepare microspheres. The microspheres degradation and drug release behaviors were evaluated through their molecular weight reduction rate, mass loss rate, morphology erosion and drug release profile. The hydrophilic PLGA-PEG-PLGA is expected to improve the degradation and drug release behaviors of PCL microspheres. RESULTS Microspheres in blending materials exhibited faster erosion rates than pure PCL microspheres, forming holes much quickly on the particle's surface for the drug to diffuse out. A higher proportion of PLGA-PEG-PLGA caused faster degradation and erosion rates. The blending microspheres showed much faster drug release rates than pure PCL microspheres. CONCLUSION With blending of 25wt% PLGA-PEG-PLGA, the release rate of microspheres speeded up significantly, while, with a further increase of PLGA-PEG-PLGA proportion (50%, 75%, 100%), it accelerated a little. The microspheres with PCL/PLGA-PEG-PLGA of 1/1 exhibited a linear-like drug release profile. The results could be a guideline for preparing microspheres based on blending materials to obtain a desirable release.
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Affiliation(s)
- Siyuan Wang
- Department of Orthopaedics, Liyuan Hospital, Tongji Medical College, Huazhong University of Science and Technology (HUST), Wuhan 430077, China
| | - Xiaobo Feng
- Department of Orthopaedics, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology (HUST), Wuhan 430022, China
| | - Ping Liu
- Department of Orthopaedics, Liyuan Hospital, Tongji Medical College, Huazhong University of Science and Technology (HUST), Wuhan 430077, China
| | - Youxiu Wei
- Department of Orthopaedics, Liyuan Hospital, Tongji Medical College, Huazhong University of Science and Technology (HUST), Wuhan 430077, China
| | - Baojun Xiao
- Department of Orthopaedics, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology (HUST), Wuhan 430022, China
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Campbell KT, Silva EA. Biomaterial Based Strategies for Engineering New Lymphatic Vasculature. Adv Healthc Mater 2020; 9:e2000895. [PMID: 32734721 PMCID: PMC8985521 DOI: 10.1002/adhm.202000895] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2020] [Revised: 07/08/2020] [Indexed: 12/15/2022]
Abstract
The lymphatic system is essential for tissue regeneration and repair due to its pivotal role in resolving inflammation, immune cell surveillance, lipid transport, and maintaining tissue homeostasis. Loss of functional lymphatic vasculature is directly implicated in a variety of diseases, including lymphedema, obesity, and the progression of cardiovascular diseases. Strategies that stimulate the formation of new lymphatic vessels (lymphangiogenesis) could provide an appealing new approach to reverse the progression of these diseases. However, lymphangiogenesis is relatively understudied and stimulating therapeutic lymphangiogenesis faces challenges in precise control of lymphatic vessel formation. Biomaterial delivery systems could be used to unleash the therapeutic potential of lymphangiogenesis for a variety of tissue regenerative applications due to their ability to achieve precise spatial and temporal control of multiple therapeutics, direct tissue regeneration, and improve the survival of delivered cells. In this review, the authors begin by introducing therapeutic lymphangiogenesis as a target for tissue regeneration, then an overview of lymphatic vasculature will be presented followed by a description of the mechanisms responsible for promoting new lymphatic vessels. Importantly, this work will review and discuss current biomaterial applications for stimulating lymphangiogenesis. Finally, challenges and future directions for utilizing biomaterials for lymphangiogenic based treatments are considered.
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Affiliation(s)
- Kevin T Campbell
- Department of Biomedical Engineering, University of California Davis, Davis, CA, 95616, USA
| | - Eduardo A Silva
- Department of Biomedical Engineering, University of California Davis, Davis, CA, 95616, USA
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Injectable hydrogel delivering bone morphogenetic protein-2, vascular endothelial growth factor, and adipose-derived stem cells for vascularized bone tissue engineering. J Drug Deliv Sci Technol 2020. [DOI: 10.1016/j.jddst.2020.101637] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
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8
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Golubeva E, Chumakova N, Kuzin S, Grigoriev I, Kalai T, Korotkevich A, Bogorodsky S, Krotova L, Popov V, Lunin V. Paramagnetic bioactives encapsulated in poly(D,L-lactide) microparticules: Spatial distribution and in vitro release kinetics. J Supercrit Fluids 2020. [DOI: 10.1016/j.supflu.2019.104748] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Kayıran Çelebier S, Bozdağ Pehlivan S, Demirbilek M, Akıncı M, Vural İ, Akdağ Y, Yürüker S, Ünlü N. Development of an Anti-Inflammatory Drug-Incorporated Biomimetic Scaffold for Corneal Tissue Engineering. J Ocul Pharmacol Ther 2020; 36:433-446. [PMID: 32023420 DOI: 10.1089/jop.2019.0114] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023] Open
Abstract
Purpose: The aim of this study was to design naproxen sodium (NS)-containing, biomimetic, porous poly(lactide-co-glycolide) (PLGA) scaffolds for regeneration of damaged corneal epithelium. Methods: NS-incorporated PLGA scaffolds were prepared using the emulsion freeze-drying method and then coated with collagen or poly-l-lysine. Porosity measurements of the scaffolds were performed by the gas adsorption/desorption method and the scaffolds demonstrated highly porous, open-cellular pore structures with pore sizes from 150 to 200 μm. Results: The drug loading efficiency of scaffolds was found to be higher than 84%, and about 90%-98% of NS was released at the end of 7 days with a fast drug release rate at the initial period of time and then in a slow and sustained manner. The corneal epithelial cells were isolated from New Zealand white rabbits. The obtained cells were seeded onto scaffolds and continued to increase during the time period of the study, indicating that the scaffolds might promote corneal epithelial cell proliferation without causing toxic effects for at least 10 days. Conclusions: The NS-loaded PLGA scaffolds exhibited a combination of controlled drug release and biomimetic properties that might be attractive for use in treatment of corneal damage both for controlled release and biomedical applications.
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Affiliation(s)
- Seren Kayıran Çelebier
- Department of Pharmaceutical Technology, Faculty of Pharmacy, and Faculty of Medicine, Hacettepe University, Ankara, Turkey
| | - Sibel Bozdağ Pehlivan
- Department of Pharmaceutical Technology, Faculty of Pharmacy, and Faculty of Medicine, Hacettepe University, Ankara, Turkey
| | - Murat Demirbilek
- Nanotechnology Nanomedicine Department, Hacettepe University, Ankara, Turkey
| | - Murat Akıncı
- Department of Medical Genetics, Faculty of Medicine, Ankara University, Ankara, Turkey
| | - İmran Vural
- Department of Pharmaceutical Technology, Faculty of Pharmacy, and Faculty of Medicine, Hacettepe University, Ankara, Turkey
| | - Yağmur Akdağ
- Department of Pharmaceutical Technology, Faculty of Pharmacy, and Faculty of Medicine, Hacettepe University, Ankara, Turkey
| | - Sinan Yürüker
- Department of Histology and Embryology, Faculty of Medicine, Hacettepe University, Ankara, Turkey
| | - Nurşen Ünlü
- Department of Pharmaceutical Technology, Faculty of Pharmacy, and Faculty of Medicine, Hacettepe University, Ankara, Turkey
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Sharma D, Arora S, Singh J. Smart Thermosensitive Copolymer Incorporating Chitosan-Zinc-Insulin Electrostatic Complexes for Controlled Delivery of Insulin: Effect of Chitosan Chain Length. INT J POLYM MATER PO 2019; 69:1054-1068. [PMID: 33012880 DOI: 10.1080/00914037.2019.1655750] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
This work was designed to optimize thermosensitive copolymeric depot-based system for delivering insulin at a controlled rate for a prolonged period following a single subcutaneous injection. Intrinsic ability of insulin to form hexamers in the presence of zinc and electrostatic complexes with chitosan (CS) were explored for improving stability and release characteristics of insulin through the copolymeric depot. CS-zinc-insulin complexes were prepared using CS of different chain lengths (5, 30, 50, 200 kDa). Effect of different chain lengths of CS on the thermal stability, binding constant, and release profile of insulin was determined. Increasing chain length of CS demonstrated increasing thermal stability of insulin. However, higher chain length of CS adversely affected the release profile of insulin. Hydrolytic degradation analysis showed rapid degradation of copolymer in formulation containing higher chain length of CS (200 kDa)-zinc-insulin complexes, implying formation of bigger pores and channels in copolymeric matrix during initial release in this system. However, formulation containing smaller chain length of CS (5 kDa)-zinc-insulin complexes demonstrated slow copolymer degradation and sustained insulin release profile. Additionally, CS-zinc-insulin complexes were effective in preserving stability of insulin during the entire duration of release and storage.
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Affiliation(s)
- Divya Sharma
- Department of Pharmaceutical Sciences, School of Pharmacy, College of Health Professions, North Dakota State University, Fargo 58105, ND, USA
| | - Sanjay Arora
- Department of Pharmaceutical Sciences, School of Pharmacy, College of Health Professions, North Dakota State University, Fargo 58105, ND, USA
| | - Jagdish Singh
- Department of Pharmaceutical Sciences, School of Pharmacy, College of Health Professions, North Dakota State University, Fargo 58105, ND, USA
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Damiati S, Scheberl A, Zayni S, Damiati SA, Schuster B, Kompella UB. Albumin-bound nanodiscs as delivery vehicle candidates: Development and characterization. Biophys Chem 2019; 251:106178. [DOI: 10.1016/j.bpc.2019.106178] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2018] [Revised: 04/28/2019] [Accepted: 04/28/2019] [Indexed: 10/26/2022]
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Seyedebrahimi R, Razavi S, Varshosaz J. Controlled Delivery of Brain Derived Neurotrophic Factor and Gold-Nanoparticles from Chitosan/TPP Nanoparticles for Tissue Engineering Applications. J CLUST SCI 2019. [DOI: 10.1007/s10876-019-01621-9] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
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Hydrogels for sustained delivery of biologics to the back of the eye. Drug Discov Today 2019; 24:1470-1482. [PMID: 31202673 DOI: 10.1016/j.drudis.2019.05.037] [Citation(s) in RCA: 33] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2018] [Revised: 04/11/2019] [Accepted: 05/31/2019] [Indexed: 12/31/2022]
Abstract
Hydrogels are water-laden polymer networks that have been used for myriad biological applications. By controlling the chemistry through which a hydrogel is constructed, a wide range of chemical and physical properties can be accessed, making them an attractive class of biomaterials. In this review, we cover the application of hydrogels for sustained delivery of biologics to the back of the eye. In adapting hydrogels to this purpose, success is dependent on careful consideration of material properties, route of administration, means of injection, and control of drug efflux, all of which are addressed. We also provide a perspective on clinical and chemistry, manufacturing and controls (CMC) considerations that are integral to the development of an ocular hydrogel delivery system.
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Spatiotemporal release of VEGF from biodegradable polylactic-co-glycolic acid microspheres induces angiogenesis in chick chorionic allantoic membrane assay. Int J Pharm 2019; 561:236-243. [PMID: 30853484 DOI: 10.1016/j.ijpharm.2019.03.015] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2018] [Revised: 03/05/2019] [Accepted: 03/06/2019] [Indexed: 11/20/2022]
Abstract
While vascular endothelial growth factor (VEGF) is an acknowledged potent pro-angiogenic agent there is a need to deliver it at an appropriate concentration for several days to achieve angiogenesis. The aim of this study was to produce microspheres of biodegradable polylactic-co-glycolic acid (PLGA) tailored to achieve sustained release of VEGF at an appropriate concentration over seven days, avoiding excessive unregulated release of VEGF that has been associated with the formation of leaky blood vessels. Several formulations were examined to produce microspheres loaded with both human serum albumin (HSA) and VEGF to achieve release of VEGF between 3 and 10 ng per ml for seven days to match the therapeutic window desired for angiogenesis. In vitro experiments showed an increase in endothelial cell proliferation in response to microspheres bearing VEGF. Similarly, when microspheres containing VEGF were added to the chorionic membrane of fertilised chicken eggs, there was an increase in the development of blood vessels over seven days in response, which was significant for microspheres bearing VEGF and HSA, but not VEGF alone. There was an increase in both blood vessel density and branching - both signs of proangiogenic activity. Further, there was clearly migration of cells to the VEGF loaded microspheres. In summary, we describe the development of an injectable delivery vehicle to achieve spatiotemporal release of physiologically relevant levels of VEGF for several days and demonstrate the angiogenic response to this. We propose that such a treatment vehicle would be suitable for the treatment of ischemic tissue or wounds.
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Mezu-Ndubuisi OJ, Wang Y, Schoephoerster J, Falero-Perez J, Zaitoun IS, Sheibani N, Gong S. Intravitreal Delivery of VEGF-A 165-loaded PLGA Microparticles Reduces Retinal Vaso-Obliteration in an In Vivo Mouse Model of Retinopathy of Prematurity. Curr Eye Res 2018; 44:275-286. [PMID: 30383455 DOI: 10.1080/02713683.2018.1542736] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Abstract
PURPOSE Retinopathy of prematurity (ROP) is a condition of abnormal retinal vascularization with reduced levels of vascular endothelial growth factor (VEGF) causing vaso-obliteration (Phase I), followed by abnormal neovascularization from increased VEGF (Phase II). We hypothesized that intravitreal pro-angiogenic VEGF-A in microparticle form would promote earlier retinal revascularization in an oxygen-induced ischemic retinopathy (OIR) mouse model. MATERIALS AND METHODS Wildtype mice (39) were exposed to 77% oxygen from postnatal day 7 (P7) to P12. VEGF-A165-loaded poly(lactic-co-glycolic acid) (PLGA) (n = 15) or empty PLGA (n = 14) microparticles were fabricated using a water-in-oil-in-water double emulsion method, and injected intravitreally at P13 into mice right eyes (RE). Left eyes (LE) were untreated. At P20, after retinal fluorescein angiography, vascular parameters were quantified. Retinal VEGF levels at P13 and flatmounts at P20 were performed separately. RESULTS VEGF-A165-loaded microparticles had a mean diameter of 4.2 μm. with a loading level of 8.6 weight.%. Retinal avascular area was reduced in VEGF-treated RE (39.5 ± 9.0%) compared to untreated LE (52.6 ± 6.1%, p < 0.0001) or empty microparticle-treated RE (p < 0.001) and untreated LEs (p = 0.001). Retinal arteries in VEGF-treated RE were less tortuous than untreated LE (1.08 ± 0.05 vs. 1.18 ± 0.08, p < 0.001) or empty-microparticles-treated RE (p = 0.02). Retinal arterial tortuosity was similar in the LE of VEGF and empty microparticle-treated mice (P > 0.05). Retinal vein width was similar in VEGF-treated and empty microparticle-treated RE (P > 0.9), which were each less dilated than their contralateral LE (p < 0.01). VEGF levels were higher in P13 OIR mice than RA mice (p < 0.0001). Retinal flatmounts showed vaso-obliteration and neovascularization. CONCLUSIONS Endogenous retinal VEGF is suppressed in OIR mice. Exogenous intravitreal VEGF-A165-loaded microparticles in OIR mice reduced retinal vaso-obliteration and accelerated recovery from vein dilation and arterial tortuosity. This may be beneficial in preventing Phase II ROP without systemic effects.
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Affiliation(s)
- Olachi J Mezu-Ndubuisi
- a Department of Pediatrics , University of Wisconsin-Madison , Madison , WI , USA.,b Department of Ophthalmology and Visual Sciences , University of Wisconsin-Madison , Madison , WI , USA
| | - Yuyuan Wang
- c Department of Materials Science and Engineering and Wisconsin Institute for Discovery , University of Wisconsin-Madison , Madison , WI , USA
| | - Jamee Schoephoerster
- a Department of Pediatrics , University of Wisconsin-Madison , Madison , WI , USA
| | - Juliana Falero-Perez
- b Department of Ophthalmology and Visual Sciences , University of Wisconsin-Madison , Madison , WI , USA
| | - Ismail S Zaitoun
- b Department of Ophthalmology and Visual Sciences , University of Wisconsin-Madison , Madison , WI , USA
| | - Nader Sheibani
- b Department of Ophthalmology and Visual Sciences , University of Wisconsin-Madison , Madison , WI , USA.,d Department of Biomedical Engineering , University of Wisconsin-Madison , Madison , WI , USA
| | - Shaoqin Gong
- c Department of Materials Science and Engineering and Wisconsin Institute for Discovery , University of Wisconsin-Madison , Madison , WI , USA.,d Department of Biomedical Engineering , University of Wisconsin-Madison , Madison , WI , USA
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Ding D, Zhu Q. Recent advances of PLGA micro/nanoparticles for the delivery of biomacromolecular therapeutics. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2018; 92:1041-1060. [DOI: 10.1016/j.msec.2017.12.036] [Citation(s) in RCA: 162] [Impact Index Per Article: 27.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/17/2017] [Revised: 12/18/2017] [Accepted: 12/30/2017] [Indexed: 01/06/2023]
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Single Step Double-walled Nanoencapsulation (SSDN). J Control Release 2018; 280:11-19. [PMID: 29729351 DOI: 10.1016/j.jconrel.2018.04.048] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2018] [Accepted: 04/28/2018] [Indexed: 12/20/2022]
Abstract
A quick fabrication method for making double-walled (DW) polymeric nanospheres is presented. The process uses sequential precipitation of two polymers. By choosing an appropriate solvent and non-solvent polymer pair, and engineering two sequential phase inversions which induces first precipitation of the core polymer followed by precipitation of the shell polymer, DW nanospheres can be created instantaneously. A series of DW formulations were prepared with various core and shell polymers, then characterized using laser diffraction particle sizing, scanning electron microscopy, atomic force microscopy, Fourier transform infrared spectroscopy, and differential scanning calorimetry (DSC). Atomic force microscopy (AFM) imaging confirmed existence of a single core polymer coated with a second polymer. Insulin (3.3% loading) was used as a model drug to assess its release profile from core (PLGA) and shell (PBMAD) polymers and resulted with a tri-phase release profile in vitro for two months. Current approaches for producing DW nanoparticles (NPs) are limited by the complexity and time involved. Additional issues include aggregation and entrapment of multiple spheres and the undesired formation of heterogeneous coatings. Therefore, the technique presented here is advantageous because it can produce NPs with distinct, core-shell morphologies through a rapid, spontaneous, self-assembly process. This method not only produces DW NPs, but can also be used to encapsulate therapeutic drug. Furthermore, modification of this process to other core and shell polymers is feasible using the general guidelines provided in this paper.
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He Y, Liu P, Shi C, Liu Y, Liu S, Feng X, Fu D. The influence of hydrophilic mPEG segment on formation, morphology, and properties of PCL-mPEG microspheres. ADVANCES IN POLYMER TECHNOLOGY 2017. [DOI: 10.1002/adv.21887] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Affiliation(s)
- Yu He
- Department of Orthopaedics; Union Hospital; Tongji Medical College; Huazhong University of Science and Technology (HUST); Wuhan China
| | - Ping Liu
- Department of Orthopaedics; Li Yuan Hospital; Tongji Medical College; Huazhong University of Science and Technology (HUST); Wuhan China
| | - Chen Shi
- Department of Pharmacy; Union Hospital; Tongji Medical College; Huazhong University of Science and Technology (HUST); Wuhan China
| | - Yongwei Liu
- Department of Orthopaedics; Union Hospital; Tongji Medical College; Huazhong University of Science and Technology (HUST); Wuhan China
| | - Songxiang Liu
- Department of Orthopaedics; Union Hospital; Tongji Medical College; Huazhong University of Science and Technology (HUST); Wuhan China
| | - Xiaobo Feng
- Department of Orthopaedics; Union Hospital; Tongji Medical College; Huazhong University of Science and Technology (HUST); Wuhan China
| | - Dehao Fu
- Department of Orthopaedics; Union Hospital; Tongji Medical College; Huazhong University of Science and Technology (HUST); Wuhan China
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Enhanced stimulation of anti-breast cancer T cells responses by dendritic cells loaded with poly lactic-co-glycolic acid (PLGA) nanoparticle encapsulated tumor antigens. JOURNAL OF EXPERIMENTAL & CLINICAL CANCER RESEARCH : CR 2016; 35:168. [PMID: 27782834 PMCID: PMC5080692 DOI: 10.1186/s13046-016-0444-6] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/28/2016] [Accepted: 10/11/2016] [Indexed: 11/10/2022]
Abstract
BACKGROUND Developing safe and effective cancer vaccine formulations is a primary focus in the field of cancer immunotherapy. Dendritic cells (DC) are currently employed as cellular vaccine in clinical trials of tumor immunotherapy. Recognizing the critical role of DCs in initiating anti-tumor immunity has resulted in the development of several strategies that target vaccine antigens to DCs to trigger anti-tumor T cell responses. To increase the efficiency of antigen delivery systems for anti-tumor vaccines, encapsulation of tumor-associated antigens in polymer nanoparticles (NPs) has been established. METHODS In this study, the effect of tumor lysate antigen obtained from three stage III breast cancer tissues encapsulated within PLGA NPs to enhance the DC maturation was investigated. The T-cell immune response activation was then fallowed up. Fresh breast tumors were initially used to generate tumor lysate antigens containing poly lactic-co-glycolic acid (PLGA) NP. The encapsulation efficiency and release kinetics were profiled. The efficiency of encapsulation was measured using Bradford protein assays measuring the dissolved NPs. The stability of released antigen from NPs was verified using SDS-PAGE. To evaluate the hypothesis that NPs enhances antigen presentation, including soluble tumor lysate, tumor lysate containing NPs and control NPs the efficiency of NP-mediated tumor lysate delivery to DCs was evaluated by assessing CD3+ T-cell stimulation after T cell/and DCs co-culture. RESULTS The rate of encapsulation was increased by enhancing the antigen concentration of tumor lysate. However, increasing the antigen concentration diminished the encapsulation efficiency. In addition, higher initial protein contenting NPs led to a greater cumulative release. All three patients released variable amounts of IFN-γ, IL-10, IL-12 and IL-4 in response to re-stimulation. T cells stimulated with lysate-pulsed DCs induced a substantial increase in IFN-γ and IL-12 production. We demonstrated that NPs containing tumor lysate can induce maturation and activation of DCs, as antigen alone does. CONCLUSION PLGA-NPs are attractive vehicles for protein antigen delivery which effectively induce stimulation and maturation of DCs, allowing not only an enhanced antigen processing and immunogenicity or improved antigen stability, but also the targeted delivery and slow release of antigens.
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Shi C, Feng S, Liu P, Liu X, Feng X, Fu D. A novel study on the mechanisms of drug release in PLGA-mPEG microspheres with fluorescent drug. JOURNAL OF BIOMATERIALS SCIENCE-POLYMER EDITION 2016; 27:854-64. [DOI: 10.1080/09205063.2016.1166727] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Allahyari M, Mohit E. Peptide/protein vaccine delivery system based on PLGA particles. Hum Vaccin Immunother 2016; 12:806-28. [PMID: 26513024 PMCID: PMC4964737 DOI: 10.1080/21645515.2015.1102804] [Citation(s) in RCA: 94] [Impact Index Per Article: 11.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2015] [Revised: 09/15/2015] [Accepted: 09/27/2015] [Indexed: 12/19/2022] Open
Abstract
Due to the excellent safety profile of poly (D,L-lactide-co-glycolide) (PLGA) particles in human, and their biodegradability, many studies have focused on the application of PLGA particles as a controlled-release vaccine delivery system. Antigenic proteins/peptides can be encapsulated into or adsorbed to the surface of PLGA particles. The gradual release of loaded antigens from PLGA particles is necessary for the induction of efficient immunity. Various factors can influence protein release rates from PLGA particles, which can be defined intrinsic features of the polymer, particle characteristics as well as protein and environmental related factors. The use of PLGA particles encapsulating antigens of different diseases such as hepatitis B, tuberculosis, chlamydia, malaria, leishmania, toxoplasma and allergy antigens will be described herein. The co-delivery of antigens and immunostimulants (IS) with PLGA particles can prevent the systemic adverse effects of immunopotentiators and activate both dendritic cells (DCs) and natural killer (NKs) cells, consequently enhancing the therapeutic efficacy of antigen-loaded PLGA particles. We will review co-delivery of different TLR ligands with antigens in various models, highlighting the specific strengths and weaknesses of the system. Strategies to enhance the immunotherapeutic effect of DC-based vaccine using PLGA particles can be designed to target DCs by functionalized PLGA particle encapsulating siRNAs of suppressive gene, and disease specific antigens. Finally, specific examples of cellular targeting where decorating the surface of PLGA particles target orally administrated vaccine to M-cells will be highlighted.
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Affiliation(s)
- Mojgan Allahyari
- Department of Recombinant Protein Production, Research & Production Complex, Pasteur Institute of Iran, Tehran, Iran
| | - Elham Mohit
- Department of Pharmaceutical Biotechnology, School of Pharmacy, Shahid Beheshti University of Medical Sciences, Tehran, Iran
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Osswald CR, Kang-Mieler JJ. Controlled and Extended In Vitro Release of Bioactive Anti-Vascular Endothelial Growth Factors from a Microsphere-Hydrogel Drug Delivery System. Curr Eye Res 2016; 41:1216-22. [PMID: 26764892 DOI: 10.3109/02713683.2015.1101140] [Citation(s) in RCA: 45] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
PURPOSE To demonstrate controlled and extended release of bioactive anti-vascular endothelial growth factor (VEGF) agents (ranibizumab or aflibercept) from an injectable microsphere-hydrogel drug delivery system (DDS). METHODS Anti-VEGF agents were radiolabeled with iodine-125 and loaded into poly(lactic-co-glycolic acid) (PLGA) 75:25 microspheres using a modified double-emulsion, solvent evaporation technique. Microspheres were then suspended in an injectable poly(N-isopropylacrylamide)-based thermo-responsive hydrogel to create a microsphere-hydrogel DDS. Release profiles were performed in phosphate buffered saline at 37°C and at predetermined intervals, release samples were collected. Microspheres were also made using non-radiolabeled anti-VEGFs to determine the bioactivity of the DDS throughout release. Bioactivity and cytotoxicity of release samples were determined using human umbilical vascular endothelial cells (HUVECs) under VEGF-induced proliferation. RESULTS The DDS is capable of releasing either ranibizumab or aflibercept for 196 days with an initial burst (first 24 h) of 22.2 ± 2.2 and 13.1 ± 0.5 μg, respectively, followed by controlled release of 0.153 and 0.065 μg/day, respectively. Release samples showed no toxicity in HUVECs at any time. Both anti-VEGFs remained bioactive throughout release with significant inhibition of HUVEC proliferation compared to the drug-free DDS, which showed no inhibitory effect on HUVEC proliferation. CONCLUSIONS Controlled, extended, and bioactive release for approximately 200 days was achieved for both ranibizumab and aflibercept in vitro. The use of anti-VEGF-loaded microspheres suspended within an injectable, thermo-responsive hydrogel may be an advantageous ocular DDS with the potential to improve upon current therapies.
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Affiliation(s)
- Christian R Osswald
- a Department of Biomedical Engineering , Illinois Institute of Technology , Chicago , IL , USA
| | - Jennifer J Kang-Mieler
- a Department of Biomedical Engineering , Illinois Institute of Technology , Chicago , IL , USA
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Li AB, Kluge JA, Guziewicz NA, Omenetto FG, Kaplan DL. Silk-based stabilization of biomacromolecules. J Control Release 2015; 219:416-430. [PMID: 26403801 PMCID: PMC4656123 DOI: 10.1016/j.jconrel.2015.09.037] [Citation(s) in RCA: 95] [Impact Index Per Article: 10.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2015] [Accepted: 09/19/2015] [Indexed: 11/26/2022]
Abstract
Silk fibroin is a high molecular weight amphiphilic protein that self-assembles into robust biomaterials with remarkable properties including stabilization of biologicals and tunable release kinetics correlated to processing conditions. Cells, antibiotics,monoclonal antibodies and peptides, among other biologics, have been encapsulated in silk using various processing approaches and material formats. The mechanistic basis for the entrapment and stabilization features, along with insights into the modulation of release of the entrained compounds from silks will be reviewed with a focus on stabilization of bioactive molecules.
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Affiliation(s)
- Adrian B Li
- Department of Chemical and Biological Engineering, Tufts University, 4 Colby Street, Medford, MA 02155, USA
| | - Jonathan A Kluge
- Department of Biomedical Engineering, Tufts University, 4 Colby Street, Medford, MA 02155, USA
| | - Nicholas A Guziewicz
- Drug Product Technologies, Amgen, 1 Amgen Center Drive, Thousand Oaks, CA 91320, USA
| | - Fiorenzo G Omenetto
- Department of Biomedical Engineering, Tufts University, 4 Colby Street, Medford, MA 02155, USA
| | - David L Kaplan
- Department of Chemical and Biological Engineering, Tufts University, 4 Colby Street, Medford, MA 02155, USA; Department of Biomedical Engineering, Tufts University, 4 Colby Street, Medford, MA 02155, USA.
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Pastor EL, Reguera-Nuñez E, Matveeva E, Garcia-Fuentes M. Pore size is a critical parameter for obtaining sustained protein release from electrochemically synthesized mesoporous silicon microparticles. PeerJ 2015; 3:e1277. [PMID: 26557423 PMCID: PMC4636406 DOI: 10.7717/peerj.1277] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2015] [Accepted: 09/07/2015] [Indexed: 11/20/2022] Open
Abstract
Mesoporous silicon has become a material of high interest for drug delivery due to its outstanding internal surface area and inherent biodegradability. We have previously reported the preparation of mesoporous silicon microparticles (MS-MPs) synthesized by an advantageous electrochemical method, and showed that due to their inner structure they can adsorb proteins in amounts exceeding the mass of the carrier itself. Protein release from these MS-MPs showed low burst effect and fast delivery kinetics with complete release in a few hours. In this work, we explored if tailoring the size of the inner pores of the particles would retard the protein release process. To address this hypothesis, three new MS-MPs prototypes were prepared by electrochemical synthesis, and the resulting carriers were characterized for morphology, particle size, and pore structure. All MS-MP prototypes had 90 µm mean particle size, but depending on the current density applied for synthesis, pore size changed between 5 and 13 nm. The model protein α-chymotrypsinogen was loaded into MS-MPs by adsorption and solvent evaporation. In the subsequent release experiments, no burst release of the protein was detected for any prototype. However, prototypes with larger pores (>10 nm) reached 100% release in 24-48 h, whereas prototypes with small mesopores (<6 nm) still retained most of their cargo after 96 h. MS-MPs with ∼6 nm pores were loaded with the osteogenic factor BMP7, and sustained release of this protein for up to two weeks was achieved. In conclusion, our results confirm that tailoring pore size can modify protein release from MS-MPs, and that prototypes with potential therapeutic utility for regional delivery of osteogenic factors can be prepared by convenient techniques.
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Affiliation(s)
| | - Elaine Reguera-Nuñez
- Center for Research in Molecular Medicine and Chronic Diseases (CIMUS), Universidade de Santiago de Compostela , Santiago de Compostela , Spain
| | | | - Marcos Garcia-Fuentes
- Center for Research in Molecular Medicine and Chronic Diseases (CIMUS), Universidade de Santiago de Compostela , Santiago de Compostela , Spain
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Effect of Molar Mass and Water Solubility of Incorporated Molecules on the Degradation Profile of the Triblock Copolymer Delivery System. Polymers (Basel) 2015. [DOI: 10.3390/polym7081467] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
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Feng S, Lu F, Wang Y, Suo J. Comparison of the degradation and release behaviors of poly(lactide-co-glycolide)-methoxypoly(ethylene glycol) microspheres prepared with single- and double-emulsion evaporation methods. J Appl Polym Sci 2015. [DOI: 10.1002/app.41943] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Shuibin Feng
- State Key Laboratory of Material Processing and Die & Mold Technology, College of Materials Science and Engineering, Huazhong University of Science and Technology; Wuhan 430074 People's Republic of China
| | - Feng Lu
- State Key Laboratory of Material Processing and Die & Mold Technology, College of Materials Science and Engineering, Huazhong University of Science and Technology; Wuhan 430074 People's Republic of China
| | - Yan Wang
- State Key Laboratory of Material Processing and Die & Mold Technology, College of Materials Science and Engineering, Huazhong University of Science and Technology; Wuhan 430074 People's Republic of China
| | - Jinping Suo
- State Key Laboratory of Material Processing and Die & Mold Technology, College of Materials Science and Engineering, Huazhong University of Science and Technology; Wuhan 430074 People's Republic of China
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Chen J, Ding J, Zhang Y, Xiao C, Zhuang X, Chen X. Polyion complex micelles with gradient pH-sensitivity for adjustable intracellular drug delivery. Polym Chem 2015. [DOI: 10.1039/c4py01149j] [Citation(s) in RCA: 69] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Four polyion complex micelles with gradient pH-sensitivity were prepared through the electrostatic interaction for adjustable “on demand” intracellular targeting chemotherapy.
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Affiliation(s)
- Jinjin Chen
- Key Laboratory of Polymer Ecomaterials
- Changchun Institute of Applied Chemistry
- Chinese Academy of Sciences
- Changchun 130022
- P. R. China
| | - Jianxun Ding
- Key Laboratory of Polymer Ecomaterials
- Changchun Institute of Applied Chemistry
- Chinese Academy of Sciences
- Changchun 130022
- P. R. China
| | - Ying Zhang
- Key Laboratory of Polymer Ecomaterials
- Changchun Institute of Applied Chemistry
- Chinese Academy of Sciences
- Changchun 130022
- P. R. China
| | - Chunsheng Xiao
- Key Laboratory of Polymer Ecomaterials
- Changchun Institute of Applied Chemistry
- Chinese Academy of Sciences
- Changchun 130022
- P. R. China
| | - Xiuli Zhuang
- Key Laboratory of Polymer Ecomaterials
- Changchun Institute of Applied Chemistry
- Chinese Academy of Sciences
- Changchun 130022
- P. R. China
| | - Xuesi Chen
- Key Laboratory of Polymer Ecomaterials
- Changchun Institute of Applied Chemistry
- Chinese Academy of Sciences
- Changchun 130022
- P. R. China
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Feng S, Nie L, Zou P, Suo J. Effects of drug and polymer molecular weight on drug release from PLGA-mPEG microspheres. J Appl Polym Sci 2014. [DOI: 10.1002/app.41431] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Shuibin Feng
- State Key Laboratory of Mould Technology; College of Materials Science and Engineering, Huazhong University of Science and Technology (HUST); Wuhan 430074 People's Republic of China
| | - Lei Nie
- State Key Laboratory of Mould Technology; College of Materials Science and Engineering, Huazhong University of Science and Technology (HUST); Wuhan 430074 People's Republic of China
| | - Peng Zou
- State Key Laboratory of Mould Technology; College of Materials Science and Engineering, Huazhong University of Science and Technology (HUST); Wuhan 430074 People's Republic of China
| | - Jinping Suo
- State Key Laboratory of Mould Technology; College of Materials Science and Engineering, Huazhong University of Science and Technology (HUST); Wuhan 430074 People's Republic of China
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Tailored protein release from biodegradable poly(ε-caprolactone-PEG)-b-poly(ε-caprolactone) multiblock-copolymer implants. Eur J Pharm Biopharm 2014; 87:329-37. [DOI: 10.1016/j.ejpb.2014.02.012] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2013] [Revised: 02/20/2014] [Accepted: 02/24/2014] [Indexed: 11/23/2022]
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Viger ML, Sheng W, Doré K, Alhasan AH, Carling CJ, Lux J, de Gracia Lux C, Grossman M, Malinow R, Almutairi A. Near-infrared-induced heating of confined water in polymeric particles for efficient payload release. ACS NANO 2014; 8:4815-26. [PMID: 24717072 PMCID: PMC4046803 DOI: 10.1021/nn500702g] [Citation(s) in RCA: 52] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/04/2014] [Accepted: 03/31/2014] [Indexed: 05/14/2023]
Abstract
Near-infrared (NIR) light-triggered release from polymeric capsules could make a major impact on biological research by enabling remote and spatiotemporal control over the release of encapsulated cargo. The few existing mechanisms for NIR-triggered release have not been widely applied because they require custom synthesis of designer polymers, high-powered lasers to drive inefficient two-photon processes, and/or coencapsulation of bulky inorganic particles. In search of a simpler mechanism, we found that exposure to laser light resonant with the vibrational absorption of water (980 nm) in the NIR region can induce release of payloads encapsulated in particles made from inherently non-photo-responsive polymers. We hypothesize that confined water pockets present in hydrated polymer particles absorb electromagnetic energy and transfer it to the polymer matrix, inducing a thermal phase change. In this study, we show that this simple and highly universal strategy enables instantaneous and controlled release of payloads in aqueous environments as well as in living cells using both pulsed and continuous wavelength lasers without significant heating of the surrounding aqueous solution.
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Affiliation(s)
- Mathieu L. Viger
- Skaggs School of Pharmacy and Pharmaceutical Sciences, Department of Mechanical and Aerospace Engineering, Materials Science and Engineering Program, Center for Neural Circuits and Behavior, Division of Biology, Department of Neuroscience and Section of Neurobiology, Department of Chemistry and Biochemistry, and KACST−UCSD Center of Excellence in Nanomedicine, University of California, San Diego, 9500 Gilman Drive, La Jolla, California 92093-0600, United States
| | - Wangzhong Sheng
- Skaggs School of Pharmacy and Pharmaceutical Sciences, Department of Mechanical and Aerospace Engineering, Materials Science and Engineering Program, Center for Neural Circuits and Behavior, Division of Biology, Department of Neuroscience and Section of Neurobiology, Department of Chemistry and Biochemistry, and KACST−UCSD Center of Excellence in Nanomedicine, University of California, San Diego, 9500 Gilman Drive, La Jolla, California 92093-0600, United States
| | - Kim Doré
- Skaggs School of Pharmacy and Pharmaceutical Sciences, Department of Mechanical and Aerospace Engineering, Materials Science and Engineering Program, Center for Neural Circuits and Behavior, Division of Biology, Department of Neuroscience and Section of Neurobiology, Department of Chemistry and Biochemistry, and KACST−UCSD Center of Excellence in Nanomedicine, University of California, San Diego, 9500 Gilman Drive, La Jolla, California 92093-0600, United States
| | - Ali H. Alhasan
- Skaggs School of Pharmacy and Pharmaceutical Sciences, Department of Mechanical and Aerospace Engineering, Materials Science and Engineering Program, Center for Neural Circuits and Behavior, Division of Biology, Department of Neuroscience and Section of Neurobiology, Department of Chemistry and Biochemistry, and KACST−UCSD Center of Excellence in Nanomedicine, University of California, San Diego, 9500 Gilman Drive, La Jolla, California 92093-0600, United States
| | - Carl-Johan Carling
- Skaggs School of Pharmacy and Pharmaceutical Sciences, Department of Mechanical and Aerospace Engineering, Materials Science and Engineering Program, Center for Neural Circuits and Behavior, Division of Biology, Department of Neuroscience and Section of Neurobiology, Department of Chemistry and Biochemistry, and KACST−UCSD Center of Excellence in Nanomedicine, University of California, San Diego, 9500 Gilman Drive, La Jolla, California 92093-0600, United States
| | - Jacques Lux
- Skaggs School of Pharmacy and Pharmaceutical Sciences, Department of Mechanical and Aerospace Engineering, Materials Science and Engineering Program, Center for Neural Circuits and Behavior, Division of Biology, Department of Neuroscience and Section of Neurobiology, Department of Chemistry and Biochemistry, and KACST−UCSD Center of Excellence in Nanomedicine, University of California, San Diego, 9500 Gilman Drive, La Jolla, California 92093-0600, United States
| | - Caroline de Gracia Lux
- Skaggs School of Pharmacy and Pharmaceutical Sciences, Department of Mechanical and Aerospace Engineering, Materials Science and Engineering Program, Center for Neural Circuits and Behavior, Division of Biology, Department of Neuroscience and Section of Neurobiology, Department of Chemistry and Biochemistry, and KACST−UCSD Center of Excellence in Nanomedicine, University of California, San Diego, 9500 Gilman Drive, La Jolla, California 92093-0600, United States
| | - Madeleine Grossman
- Skaggs School of Pharmacy and Pharmaceutical Sciences, Department of Mechanical and Aerospace Engineering, Materials Science and Engineering Program, Center for Neural Circuits and Behavior, Division of Biology, Department of Neuroscience and Section of Neurobiology, Department of Chemistry and Biochemistry, and KACST−UCSD Center of Excellence in Nanomedicine, University of California, San Diego, 9500 Gilman Drive, La Jolla, California 92093-0600, United States
| | - Roberto Malinow
- Skaggs School of Pharmacy and Pharmaceutical Sciences, Department of Mechanical and Aerospace Engineering, Materials Science and Engineering Program, Center for Neural Circuits and Behavior, Division of Biology, Department of Neuroscience and Section of Neurobiology, Department of Chemistry and Biochemistry, and KACST−UCSD Center of Excellence in Nanomedicine, University of California, San Diego, 9500 Gilman Drive, La Jolla, California 92093-0600, United States
| | - Adah Almutairi
- Skaggs School of Pharmacy and Pharmaceutical Sciences, Department of Mechanical and Aerospace Engineering, Materials Science and Engineering Program, Center for Neural Circuits and Behavior, Division of Biology, Department of Neuroscience and Section of Neurobiology, Department of Chemistry and Biochemistry, and KACST−UCSD Center of Excellence in Nanomedicine, University of California, San Diego, 9500 Gilman Drive, La Jolla, California 92093-0600, United States
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Sandor M, Scott N, Edwards M, Qi S, De Deyne PG. In vitro and in vivo characterization of a fully resorbable and composite surgical mesh. J BIOACT COMPAT POL 2014. [DOI: 10.1177/0883911513520382] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
Fully resorbable and composite synthetic meshes are intended to provide advantages over nonabsorbable synthetic meshes, such as minimization of visceral adhesions and improved biocompatibility, but the inflammatory response to these materials has not previously been fully characterized. We compared resorbable and composite synthetic meshes using in vitro characterization and evaluated the host response in a nonhuman primate acute abdominal wall defect. After a 2-week in vitro incubation, resorbable synthetic mesh mechanical strength decreased to 0.12 ± 0.09 N (0.25% of initial strength), which preceded acidification and a fractured morphology at 1 month. The composite synthetic mesh strength decreased to 10.0 ± 3.2 N (41.1% of initial strength), coincident with morphological changes. In vivo, resorbable synthetic mesh elicited an intense yet transient foreign-body response, with macrophages and myofibroblasts persisting through 3 months of implantation. At 6 months, resorbable synthetic mesh was undetectable and the mesh–host tissue interface strength (14.7 ± 7.9 N) was equivalent to that of primary repair (21.4 ± 4.9 N). The composite synthetic mesh elicited a significant foreign-body response following 1 month of implantation. By 3 months, the composite synthetic mesh resorbable films had fully degraded, with foreign-body reaction localized to polypropylene fibers. By 6 months, macrophages had surrounded these polypropylene fibers, with a myofibroblast-positive capsule encircling a macrophage-rich layer. Resorbable and composite synthetic meshes may ultimately not be the most ideal biomaterials in situations where the biological response is expected to lead to a regeneration of host soft tissues.
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Affiliation(s)
| | | | | | - Shijie Qi
- Hôpital Notre-Dame, Department of Surgery, University of Montreal, Montreal, QC, Canada
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Szlęk J, Pacławski A, Lau R, Jachowicz R, Mendyk A. Heuristic modeling of macromolecule release from PLGA microspheres. Int J Nanomedicine 2013; 8:4601-11. [PMID: 24348037 PMCID: PMC3857266 DOI: 10.2147/ijn.s53364] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Abstract
Dissolution of protein macromolecules from poly(lactic-co-glycolic acid) (PLGA) particles is a complex process and still not fully understood. As such, there are difficulties in obtaining a predictive model that could be of fundamental significance in design, development, and optimization for medical applications and toxicity evaluation of PLGA-based multiparticulate dosage form. In the present study, two models with comparable goodness of fit were proposed for the prediction of the macromolecule dissolution profile from PLGA micro- and nanoparticles. In both cases, heuristic techniques, such as artificial neural networks (ANNs), feature selection, and genetic programming were employed. Feature selection provided by fscaret package and sensitivity analysis performed by ANNs reduced the original input vector from a total of 300 input variables to 21, 17, 16, and eleven; to achieve a better insight into generalization error, two cut-off points for every method was proposed. The best ANNs model results were obtained by monotone multi-layer perceptron neural network (MON-MLP) networks with a root-mean-square error (RMSE) of 15.4, and the input vector consisted of eleven inputs. The complicated classical equation derived from a database consisting of 17 inputs was able to yield a better generalization error (RMSE) of 14.3. The equation was characterized by four parameters, thus feasible (applicable) to standard nonlinear regression techniques. Heuristic modeling led to the ANN model describing macromolecules release profiles from PLGA microspheres with good predictive efficiency. Moreover genetic programming technique resulted in classical equation with comparable predictability to the ANN model.
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Affiliation(s)
- Jakub Szlęk
- Department of Pharmaceutical Technology and Biopharmaceutics, Jagiellonian University Medical College, Krakow, Poland
| | - Adam Pacławski
- Department of Pharmaceutical Technology and Biopharmaceutics, Jagiellonian University Medical College, Krakow, Poland
| | - Raymond Lau
- School of Chemical and Biomedical Engineering, Nanyang Technological University (NTU), Singapore
| | - Renata Jachowicz
- Department of Pharmaceutical Technology and Biopharmaceutics, Jagiellonian University Medical College, Krakow, Poland
| | - Aleksander Mendyk
- Department of Pharmaceutical Technology and Biopharmaceutics, Jagiellonian University Medical College, Krakow, Poland
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Budagumpi S, Haque RA, Endud S, Rehman GU, Salman AW. Biologically Relevant Silver(I)-N-Heterocyclic Carbene Complexes: Synthesis, Structure, Intramolecular Interactions, and Applications. Eur J Inorg Chem 2013. [DOI: 10.1002/ejic.201300483] [Citation(s) in RCA: 99] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
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Turturro S, Sunoqrot S, Ying H, Hong S, Yue BYJT. Sustained release of matrix metalloproteinase-3 to trabecular meshwork cells using biodegradable PLGA microparticles. Mol Pharm 2013; 10:3023-3032. [PMID: 23795867 DOI: 10.1021/mp4001052] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
Accumulation of extracellular matrix (ECM) materials in the trabecular meshwork (TM) is believed to be a contributing factor to intraocular pressure (IOP) elevation, a risk factor/cause of primary open angle glaucoma, a major blinding disease. Matrix metalloproteinase-3 (MMP-3) is one of the proteinases that can effectively degrade ECM elements such as fibronectin, and MMP-3 delivery to the TM represents a promising approach for IOP reduction and treatment of glaucoma. In this study, we tested the feasibility of using polymeric microparticles to achieve a slow and sustained release of active MMP-3 to cultured human TM cells. β-Casein, with molecular weight (24 kDa) and hydrophobicity similar to those of the active MMP-3 fragment (19.2 kDa), was first employed as a model for initial testing. β-casein was encapsulated into poly(lactic-co-glycolic acid) (PLGA) microparticles using a double emulsion procedure at an encapsulation efficiency of approximately 45%. The PLGA microparticles were chosen given their biocompatibility and the proven capacity of sustained release of encapsulated molecules. The release test conducted in the culture medium showed a slow and sustained release of the protein over 20 days without a significant initial burst release. Active MMP-3 was subsequently encapsulated into PLGA microparticles with an encapsulation efficiency of approximately 50%. A biofunctional assay utilizing human TM cells was set up in which the reduction of fibronectin was used as an indicator of enzyme activity. It was observed that fibronectin staining was markedly reduced by the medium collected from MMP-3-microparticle-treated cultures compared to that from blank- and β-casein-microparticle controls, which was validated using a direct MMP-3 activity assay. The controlled release of MMP-3 from the microparticles resulted in sustained degradation of fibronectin up to 10 days. This proof-of-concept undertaking represents the first study on the controlled and sustained release of active MMP-3 to TM cells via encapsulation into PLGA microparticles as a potential treatment of glaucoma.
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Affiliation(s)
- Sanja Turturro
- Department of Ophthalmology and Visual Sciences, University of Illinois at Chicago, Chicago, IL 60612, United States
| | - Suhair Sunoqrot
- Department of Biopharmaceutical Sciences, University of Illinois at Chicago, Chicago, IL 60612, United States
| | - Hongyu Ying
- Department of Ophthalmology and Visual Sciences, University of Illinois at Chicago, Chicago, IL 60612, United States
| | - Seungpyo Hong
- Department of Biopharmaceutical Sciences, University of Illinois at Chicago, Chicago, IL 60612, United States
| | - Beatrice Y J T Yue
- Department of Ophthalmology and Visual Sciences, University of Illinois at Chicago, Chicago, IL 60612, United States
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Stanković M, de Waard H, Steendam R, Hiemstra C, Zuidema J, Frijlink HW, Hinrichs WL. Low temperature extruded implants based on novel hydrophilic multiblock copolymer for long-term protein delivery. Eur J Pharm Sci 2013; 49:578-87. [DOI: 10.1016/j.ejps.2013.05.011] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2013] [Revised: 05/15/2013] [Accepted: 05/15/2013] [Indexed: 10/26/2022]
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Mirdailami O, Khoshayand MR, Soleimani M, Dinarvand R, Atyabi F. Release optimization of epidermal growth factor from PLGA microparticles. Pharm Dev Technol 2013; 19:539-47. [DOI: 10.3109/10837450.2013.805776] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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Ghalanbor Z, Körber M, Bodmeier R. Interdependency of protein-release completeness and polymer degradation in PLGA-based implants. Eur J Pharm Biopharm 2013; 85:624-30. [PMID: 23583495 DOI: 10.1016/j.ejpb.2013.03.031] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2012] [Revised: 03/22/2013] [Accepted: 03/28/2013] [Indexed: 11/26/2022]
Abstract
Release of BSA (model protein) from hot-melt extruded poly(lactide-co-glycolide) (PLGA)-based implants was incomplete. A residual mass of covalent BSA-PLGA adducts was still present after 6 months. The objective of this study was to increase the completeness of BSA release. BSA reduced the PLGA degradation and erosion rate as well as the extent of erosion. An increased uptake of release medium in the presence of BSA in addition to the early outflux of PLGA oligomers resulted in a reduction of the matrix acidity and thus reduction of autocatalysis effects. PLGA mass loss was incomplete at 60% and 80% for 10% and 25% BSA-containing implants. The extent of PLGA mass loss was correlated with the total releasable protein. The same release was obtained from implants prepared with pre-degraded PLGA suggesting that the induction phase did not affect the release completeness. Thus, the focus was on the erosion phase to enhance outflux of soluble oligomers. BSA release completeness increased by increasing the porosity of the implants at the onset of erosion phase. This could be obtained with a higher initial porosity, formation of porosity upon higher diffusional release and/or incorporation of pore-formers/plasticizers. Accordingly, the BSA release completeness could be improved by enhancing the outflux of soluble PLGA degradation products.
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Affiliation(s)
- Zahra Ghalanbor
- College of Pharmacy, Freie Universität Berlin, Berlin, Germany
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Fonseca AC, Ferreira P, Cordeiro RA, Mendonça PV, Góis JR, Gil MH, Coelho JFJ. Drug Delivery Systems for Predictive Medicine: Polymers as Tools for Advanced Applications. NEW STRATEGIES TO ADVANCE PRE/DIABETES CARE: INTEGRATIVE APPROACH BY PPPM 2013. [DOI: 10.1007/978-94-007-5971-8_16] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
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Effects of protein molecular weight on the intrinsic material properties and release kinetics of wet spun polymeric microfiber delivery systems. Acta Biomater 2013; 9:4569-78. [PMID: 22902813 DOI: 10.1016/j.actbio.2012.08.005] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2012] [Revised: 08/01/2012] [Accepted: 08/08/2012] [Indexed: 11/23/2022]
Abstract
Wet spun microfibers have great potential for the design of multifunctional controlled release scaffolds. Understanding aspects of drug delivery and mechanical strength, specific to protein molecular weight, may aid in the optimization and development of wet spun fiber platforms. This study investigated the intrinsic material properties and release kinetics of poly(l-lactic acid) (PLLA) and poly(lactic-co-glycolic acid) (PLGA) wet spun microfibers encapsulating proteins with varying molecular weights. A cryogenic emulsion technique developed in our laboratory was used to encapsulate insulin (5.8 kDa), lysozyme (14.3 kDa) and bovine serum albumin (BSA, 66.0 kDa) within wet spun microfibers (~100 μm). Protein loading was found to significantly influence mechanical strength and drug release kinetics of PLGA and PLLA microfibers in a molecular-weight-dependent manner. BSA encapsulation resulted in the most significant decrease in strength and ductility for both PLGA and PLLA microfibers. Interestingly, BSA-loaded PLGA microfibers had a twofold increase (8±2 MPa to 16±1 MPa) in tensile strength and a fourfold increase (3±1% to 12±6%) in elongation until failure in comparison to PLLA microfibers. PLGA and PLLA microfibers exhibited prolonged protein release up to 63 days in vitro. Further analysis with the Korsmeyer-Peppas kinetic model determined that the mechanism of protein release was dependent on Fickian diffusion. These results emphasize the critical role protein molecular weight has on the properties of wet spun filaments, highlighting the importance of designing small molecular analogues to replace growth factors with large molecular weights.
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Ghalanbor Z, Körber M, Bodmeier R. Protein release from poly(lactide-co-glycolide) implants prepared by hot-melt extrusion: Thioester formation as a reason for incomplete release. Int J Pharm 2012; 438:302-6. [DOI: 10.1016/j.ijpharm.2012.09.015] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2012] [Revised: 09/06/2012] [Accepted: 09/08/2012] [Indexed: 11/25/2022]
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Rothstein SN, Kay JE, Schopfer FJ, Freeman BA, Little SR. A retrospective mathematical analysis of controlled release design and experimentation. Mol Pharm 2012; 9:3003-11. [PMID: 23009671 DOI: 10.1021/mp300388w] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
The development and performance evaluation of new biodegradable polymer controlled release formulations relies on successful interpretation and evaluation of in vitro release data. However, depending upon the extent of empirical characterization, release data may be open to more than one qualitative interpretation. In this work, a predictive model for release from degradable polymer matrices was applied to a number of published release data in order to extend the characterization of release behavior. Where possible, the model was also used to interpolate and extrapolate upon collected released data to clarify the overall duration of release and also kinetics of release between widely spaced data points. In each case examined, mathematical predictions of release coincide well with experimental results, offering a more definitive description of each formulation's performance than was previously available. This information may prove particularly helpful in the design of future studies, such as when calculating proper dosing levels or determining experimental end points in order to more comprehensively evaluate a controlled release system's performance.
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Affiliation(s)
- Sam N Rothstein
- Department of Chemical Engineering, University of Pittsburgh, Pittsburgh, Pennsylvania, United States
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Mao S, Guo C, Shi Y, Li LC. Recent advances in polymeric microspheres for parenteral drug delivery – part 1. Expert Opin Drug Deliv 2012; 9:1161-76. [DOI: 10.1517/17425247.2012.709844] [Citation(s) in RCA: 67] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
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Shen J, Burgess DJ. Accelerated in-vitro release testing methods for extended-release parenteral dosage forms. ACTA ACUST UNITED AC 2012; 64:986-96. [PMID: 22686344 DOI: 10.1111/j.2042-7158.2012.01482.x] [Citation(s) in RCA: 86] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
OBJECTIVES This review highlights current methods and strategies for accelerated in-vitro drug release testing of extended-release parenteral dosage forms such as polymeric microparticulate systems, lipid microparticulate systems, in-situ depot-forming systems and implants. KEY FINDINGS Extended-release parenteral dosage forms are typically designed to maintain the effective drug concentration over periods of weeks, months or even years. Consequently, 'real-time' in-vitro release tests for these dosage forms are often run over a long time period. Accelerated in-vitro release methods can provide rapid evaluation and therefore are desirable for quality control purposes. To this end, different accelerated in-vitro release methods using United States Pharmacopeia (USP) apparatus have been developed. Different mechanisms of accelerating drug release from extended-release parenteral dosage forms, along with the accelerated in-vitro release testing methods currently employed are discussed. SUMMARY Accelerated in-vitro release testing methods with good discriminatory ability are critical for quality control of extended-release parenteral products. Methods that can be used in the development of in-vitro-in-vivo correlation (IVIVC) are desirable; however, for complex parenteral products this may not always be achievable.
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Affiliation(s)
- Jie Shen
- Department of Pharmaceutical Sciences, University of Connecticut, Storrs, CT, USA
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Trindade RA, Kiyohara PK, de Araujo PS, Bueno da Costa MH. PLGA microspheres containing bee venom proteins for preventive immunotherapy. Int J Pharm 2012; 423:124-33. [DOI: 10.1016/j.ijpharm.2011.02.027] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2010] [Revised: 02/15/2011] [Accepted: 02/21/2011] [Indexed: 10/18/2022]
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Buske J, König C, Bassarab S, Lamprecht A, Mühlau S, Wagner KG. Influence of PEG in PEG-PLGA microspheres on particle properties and protein release. Eur J Pharm Biopharm 2012; 81:57-63. [PMID: 22306701 DOI: 10.1016/j.ejpb.2012.01.009] [Citation(s) in RCA: 48] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2011] [Revised: 01/10/2012] [Accepted: 01/18/2012] [Indexed: 11/30/2022]
Abstract
The aim of the present study was to compare different commercial available types of Poly(d,l-lactide-co-glycolide) (PLGA), multiblock copolymers of PLGA and polyethylene gylcol (PEG) as well as blends of PLGA and PEG regarding the preparation of microparticles and the release behavior of encapsulated protein. Microspheres were prepared by the solvent evaporation technique using the same conditions for each formulation. The encapsulation rate of bovine serum albumin (BSA) was unaffected by the different polymer types, and the mean was 79±4%. Microspheres composed of blends of PLGA and PEG showed a porous structure, a higher specific surface area, an inhomogenous distribution of protein and a higher release rate of BSA than microspheres consisting of PLGA, whereas the release profiles were the same. The specific surface area of microparticle formulations composed of diblock copolymers was the highest with 8.57±0.07m(2)/g emphasized by a highly porous, sponge-like structure. The triblock copolymer formulation revealed nearly spherical particles with a slightly uneven surface. Although the triblock copolymer consists of 10% PEG, the specific surface area was the lowest of all formulations. The rapid hydration due to PEG leads to a swollen matrix, which released the protein in a slow and continuous way.
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Affiliation(s)
- J Buske
- Laboratory of Pharmaceutical Engineering, Institute of Pharmacy, University of Bonn, Germany
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Patel RS, Cho DY, Tian C, Chang A, Estrellas KM, Lavin D, Furtado S, Mathiowitz E. Doxycycline delivery from PLGA microspheres prepared by a modified solvent removal method. J Microencapsul 2012; 29:344-52. [PMID: 22263669 DOI: 10.3109/02652048.2011.651499] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
We report on the development of a modified solvent removal method for the encapsulation of hydrophilic drugs within poly(lactic-co-glycolic acid) (PLGA). Using a water/oil/oil double emulsion, hydrophilic doxycycline was encapsulated within PLGA spheres with particle diameters ranging from approximately 600 nm to 19 µm. Encapsulation efficiencies of up to 74% were achieved for theoretical loadings from 1% to 10% (w/w), with biphasic release over 85 days with nearly complete release at the end of this time course. About 1% salt was added to the formulations to examine its effects on doxycycline release; salt modulated release only by increasing the magnitude of initial release without altering kinetics. Fourier transform infrared spectroscopy indicated no characteristic differences between doxycycline-loaded and control spheres. Differential scanning calorimetry and X-ray diffraction suggest that there may be a molecular dispersion of the doxycycline within the spheres and the doxycycline may be in an amorphous state, which could explain the slow, prolonged release of the drug.
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Affiliation(s)
- Roshni S Patel
- Department of Molecular Pharmacology, Physiology, and Biotechnology, Center for Biomedical Engineering, Center for Biomedical Engineering, Brown University, Providence, RI 02912, USA
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Shen J, Burgess DJ. Accelerated in vitro release testing of implantable PLGA microsphere/PVA hydrogel composite coatings. Int J Pharm 2012; 422:341-8. [PMID: 22016033 PMCID: PMC3246580 DOI: 10.1016/j.ijpharm.2011.10.020] [Citation(s) in RCA: 56] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2011] [Revised: 10/06/2011] [Accepted: 10/07/2011] [Indexed: 12/25/2022]
Abstract
Dexamethasone loaded poly(lactic-co-glycolic acid) (PLGA) microsphere/PVA hydrogel composites have been investigated as an outer drug-eluting coating for implantable devices such as glucose sensors to counter negative tissue responses to implants. The objective of this study was to develop a discriminatory, accelerated in vitro release testing method for this drug-eluting coating using United States Pharmacopeia (USP) apparatus 4. Polymer degradation and drug release kinetics were investigated under "real-time" and accelerated conditions (i.e. extreme pH, hydro-alcoholic solutions and elevated temperatures). Compared to "real-time" conditions, the initial burst and lag phases were similar using hydro-alcoholic solutions and extreme pH conditions, while the secondary apparent zero-order release phase was slightly accelerated. Elevated temperatures resulted in a significant acceleration of dexamethasone release. The accelerated release data were able to predict "real-time" release when applying the Arrhenius equation. Microsphere batches with faster and slower release profiles were investigated under "real-time" and elevated temperature (60°C) conditions to determine the discriminatory ability of the method. The results demonstrated both the feasibility and the discriminatory ability of this USP apparatus 4 method for in vitro release testing of drug loaded PLGA microsphere/PVA hydrogel composites. This method may be appropriate for similar drug/device combination products and drug delivery systems.
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Affiliation(s)
- Jie Shen
- Department of Pharmaceutical Sciences, University of Connecticut, 69 N Eagleville Rd Unit 3092, Storrs, CT 06269, United States
- School of Pharmacy, Fudan University, Shanghai, 826 Zhangheng Road, Shanghai 201203, P.R. China
| | - Diane J. Burgess
- Department of Pharmaceutical Sciences, University of Connecticut, 69 N Eagleville Rd Unit 3092, Storrs, CT 06269, United States
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The mechanisms of drug release in poly(lactic-co-glycolic acid)-based drug delivery systems—A review. Int J Pharm 2011; 415:34-52. [DOI: 10.1016/j.ijpharm.2011.05.049] [Citation(s) in RCA: 722] [Impact Index Per Article: 55.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2011] [Revised: 05/08/2011] [Accepted: 05/09/2011] [Indexed: 01/07/2023]
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50
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Prasad S, Cody V, Saucier-Sawyer JK, Saltzman WM, Sasaki CT, Edelson RL, Birchall MA, Hanlon DJ. Polymer nanoparticles containing tumor lysates as antigen delivery vehicles for dendritic cell-based antitumor immunotherapy. NANOMEDICINE : NANOTECHNOLOGY, BIOLOGY, AND MEDICINE 2011; 7:1-10. [PMID: 20692374 PMCID: PMC3073408 DOI: 10.1016/j.nano.2010.07.002] [Citation(s) in RCA: 78] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/02/2009] [Revised: 07/19/2010] [Accepted: 07/19/2010] [Indexed: 01/17/2023]
Abstract
Encapsulation of tumor-associated antigens in polymer nanoparticles (NP) is a promising approach to enhance efficiency of antigen delivery for anti-tumor vaccines. Head and neck squamous carcinoma (HNSCC) cell lines were initially used to generate tumor-associated antigens (TAA)-containing poly (lactic-co-glycolic acid) (PLGA) NP; encapsulation efficiency and release kinetics were profiled. Findings were adopted to entrap fresh tumor lysate from five patients with advanced HNSCC. To test the hypothesis that NP enhance antigen presentation, dendritic cell (DC) produced from patient blood monocyte precursors were loaded with either the un-encapsulated or NP-encapsulated versions of tumor lysates. These were used to stimulate freshly-isolated autologous CD8+ T cells. In four of five patients, anti-tumor CD8+ T cells showed significantly increased immunostimulatory IFN-γ (p=0.071) or decreased immmunoinhibitory IL-10 production (p=0.0004) associated with NP-mediated antigen delivery. The observations represent an enabling step in the production of clinically-translatable, inexpensive, highly-efficient, and personalized polymer-based immunotherapy for solid organ malignancies. FROM THE CLINICAL EDITOR Enhancing the antigen presentation may be a viable approach to increase the efficiency of tumor cell directed cytotoxicity via immune mechanisms. This study presents an example for this using head and neck cancer cell lines and nanotechnology-based encapsulated antigen presentation to dendritic cells. The observed CD8+ T-cell response was significantly enhanced. This method may pave the way to a highly efficient cancer cell elimination method with minimal to no toxicity.
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Affiliation(s)
- Shashi Prasad
- Department of Dermatology, Yale University, New Haven, Connecticut 06520-8260, USA
| | - Virginia Cody
- Department of Dermatology, Yale University, New Haven, Connecticut 06520-8260, USA
| | | | - W. Mark Saltzman
- Department of Biomedical Engineering, Yale University, New Haven, Connecticut 06520-8260, USA
| | - Clarence T. Sasaki
- Section of Otolaryngology, Yale University, New Haven, Connecticut 06520-8260, USA
| | - Richard L. Edelson
- Department of Dermatology, Yale University, New Haven, Connecticut 06520-8260, USA
| | | | - Douglas J. Hanlon
- Department of Dermatology, Yale University, New Haven, Connecticut 06520-8260, USA
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