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Oh KS, Lee S, Na JH, Kim JY, Kim DE, Kim K, Kwon IC, Yuk SH, Jeong SY. Blood-pool multifunctional nanoparticles formed by temperature-induced phase transition for cancer-targeting therapy and molecular imaging. Int J Pharm 2012; 437:192-202. [PMID: 22944301 DOI: 10.1016/j.ijpharm.2012.08.028] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2012] [Revised: 08/05/2012] [Accepted: 08/19/2012] [Indexed: 02/04/2023]
Abstract
Multifunctional nanoparticles (NPs) were prepared based on temperature-induced phase transition in a molten mixture of Lipiodol(®), Tween 80, paclitaxel (PTX), and Pluronic F-68, wherein the Lipiodol(®)/Tween 80 mixture is used as a solubilizer for PTX, and Pluronic F-68 is used for the stabilization of the molten mixture. The morphology and size distribution of optimized multifunctional NPs were observed using transmittance electron microscopy (TEM) and a particle size analyzer. In the optical imaging of tumor-bearing mice using a near-infrared fluorescence (NIRF) imaging system, the multifunctional NPs were evaluated in terms of a time-dependent excretion profile, in vivo biodistribution and tumor-targeting capability compared to free fluorescence dye. In addition, the prolonged circulation of multifunctional NPs was confirmed by enhancement of the blood-pool in live animals using a micro-CT imaging system, because iodine-containing Lipiodol(®) has an X-ray enhancement property. Finally, the anti-tumor efficacy of multifunctional NPs was monitored by injecting the multifunctional NPs into the tail veins of tumor-bearing mice. The multifunctional NPs showed excellent tumor targetability and anti-tumor efficacy in tumor-bearing mice, caused by the enhanced permeation and retention (EPR) effect.
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Na JH, Lee SY, Lee S, Koo H, Min KH, Jeong SY, Yuk SH, Kim K, Kwon IC. Effect of the stability and deformability of self-assembled glycol chitosan nanoparticles on tumor-targeting efficiency. J Control Release 2012; 163:2-9. [PMID: 22846988 DOI: 10.1016/j.jconrel.2012.07.028] [Citation(s) in RCA: 73] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2012] [Revised: 07/16/2012] [Accepted: 07/21/2012] [Indexed: 10/28/2022]
Abstract
To evaluate the tumor targeting efficiency of self-assembled polymeric nanoparticles, four glycol chitosan nanoparticles (CNPs) with different degrees of hydrophobic substitution were prepared by coupling 7.5, 12, 23, and 35 wt.% of 5β-cholanic acid to hydrophilic glycol chitosan polymer (GC). The sizes and zeta-potentials of different CNPs in aqueous condition were not significantly different, but their stability and deformability were greatly dependent upon the degree of substitution (DS) of 5β-cholanic acid. With an increase in hydrophobicity, CNPs became more stable and rigid, as characterized by SDS-PAGE and filtration tests. To compare with CNPs, linear GC and polystyrene nanoparticles (PSNPs) were employed as controls. In vivo tumor accumulation of Cy5.5-labeled linear GC, polystyrene nanoparticles (PSNPs) and CNPs were monitored in flank tumors and liver tumor-bearing mice models using near-infrared fluorescence (NIRF) imaging systems. CNPs displayed higher tumor accumulation than GC and PSNPs via the enhanced permeability and retention (EPR) effect. Interestingly, CNPs containing 23 wt.% of 5β-cholanic acid (CNP-23%) showed the highest tumor-targeting efficiency compared to other CNPs. As exemplified in this study, the stability of CNP-23% is better than CNP-7.5% and CNP-12% containing 7.5 wt.% and 12 wt.% of 5β-cholanic acid, respectively, and the deformability of CNP-23% is better than that of CNP-35% containing 35 wt.% of 5β-cholanic acid. We proposed that the superior tumor-targeting efficiency of CNP-23% is mainly due to their balanced stability and deformability in vivo. This study demonstrates that the degree of hydrophobic substitution of self-assembled nanoparticles could determine their stability and deformability. Importantly, they were founded to be the key factors which affect their tumor-targeting efficiency in vivo, and so that these factors should be highly considered during developing nanoparticles for tumor-targeted imaging or drug delivery.
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Park K, Jung GY, Kim MK, Park MS, Shin YK, Hwang JK, Yuk SH. Triptorelin acetate-loaded poly(lactide-co-glycolide) (PLGA) microspheres for controlled drug delivery. Macromol Res 2012. [DOI: 10.1007/s13233-012-0123-1] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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Oh MJ, Shim JB, Yoo H, Lee GY, Jo H, Jeong SM, Yuk SH, Lee D, Khang G. The dissolution property of raloxifene HCl solid dispersion using hydroxypropyl methylcellulose. Macromol Res 2012. [DOI: 10.1007/s13233-012-0127-x] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Cho SH, Lim SM, Han DK, Yuk SH, Im GI, Lee JH. Time-Dependent Alginate/Polyvinyl Alcohol Hydrogels as Injectable Cell Carriers. JOURNAL OF BIOMATERIALS SCIENCE-POLYMER EDITION 2012; 20:863-76. [DOI: 10.1163/156856209x444312] [Citation(s) in RCA: 52] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Yuk SH, Oh KS, Park J, Kim SJ, Kim JH, Kwon IK. Paclitaxel-loaded poly(lactide-co-glycolide)/poly(ethylene vinyl acetate) composite for stent coating by ultrasonic atomizing spray. SCIENCE AND TECHNOLOGY OF ADVANCED MATERIALS 2012; 13:025005. [PMID: 27877483 PMCID: PMC5090633 DOI: 10.1088/1468-6996/13/2/025005] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/26/2011] [Revised: 04/03/2012] [Accepted: 02/12/2012] [Indexed: 06/06/2023]
Abstract
The mixture of poly(lactide-co-glycolide) (PLGA) and poly(ethylene vinyl acetate) (PEVA) forms a homogeneous liquid in an organic solvent such as tetrahydrofuran, and a phase-separated PLGA/PEVA composite can be prepared from it by evaporating the organic solvent. Exploiting this phenomenon, we designed a novel method of preparing a drug-loaded PLGA/PEVA composite and used it for coating drug-eluting stents (DESs). Paclitaxel (PTX), an anticancer drug, was chosen as a model drug. PLGA acts as a microdepot for PTX, and PEVA provides mechanical strength to the coating material. The presence of PLGA in the PLGA/PEVA composite suppressed PTX crystallization in the coating material, and PTX showed a sustained release rate over more than 30 days. The mechanical strength of the PLGA/PEVA composite was better than that of PEVA used as a control. After coating the stent with a PLGA/PEVA composite using ultrasonic atomizing spray, the morphology of the coated material was observed by scanning electron microscopy, and the release pattern of PTX was measured by high-performance liquid chromatography.
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Yoon HY, Koo H, Choi KY, Lee SJ, Kim K, Kwon IC, Leary JF, Park K, Yuk SH, Park JH, Choi K. Tumor-targeting hyaluronic acid nanoparticles for photodynamic imaging and therapy. Biomaterials 2012; 33:3980-9. [PMID: 22364699 DOI: 10.1016/j.biomaterials.2012.02.016] [Citation(s) in RCA: 203] [Impact Index Per Article: 16.9] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2011] [Accepted: 02/06/2012] [Indexed: 12/21/2022]
Abstract
Tumor-targeted imaging and therapy have been the challenging issue in the clinical field. Herein, we report tumor-targeting hyaluronic acid nanoparticles (HANPs) as the carrier of the hydrophobic photosensitizer, chlorin e6 (Ce6) for simultaneous photodynamic imaging and therapy. First, self-assembled HANPs were synthesized by chemical conjugation of aminated 5β-cholanic acid, polyethylene glycol (PEG), and black hole quencher3 (BHQ3) to the HA polymers. Second, Ce6 was readily loaded into the HANPs by a simple dialysis method resulting in Ce6-loaded hyaluronic acid nanoparticles (Ce6-HANPs), wherein in the loading efficiency of Ce6 was higher than 80%. The resulting Ce6-HANPs showed stable nano-structure in aqueous condition and rapid uptake into tumor cells. In particular Ce6-HANPs were rapidly degraded by hyaluronidases abundant in cytosol of tumor cells, which may enable intracellular release of Ce6 at the tumor tissue. After an intravenous injection into the tumor-bearing mice, Ce6-HANPs could efficiently reach the tumor tissue via the passive targeting mechanism and specifically enter tumor cells through the receptor-mediated endocytosis based on the interactions between HA of nanoparticles and CD44, the HA receptor on the surface of tumor cells. Upon laser irradiation, Ce6 which was released from the nanoparticles could generate fluorescence and singlet oxygen inside tumor cells, resulting in effective suppression of tumor growth. Overall, it was demonstrated that Ce6-HANPs could be successfully applied to in vivo photodynamic tumor imaging and therapy simultaneously.
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Yuk SH, Oh KS, Cho SH, Kim SY, Oh S, Lee JH, Kim K, Kwon IC. Enhancement of the Targeting Capabilities of the Paclitaxel-Loaded Pluronic Nanoparticles with a Glycol Chitosan/Heparin Composite. Mol Pharm 2011; 9:230-6. [DOI: 10.1021/mp200278s] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Koo H, Huh MS, Sun IC, Yuk SH, Choi K, Kim K, Kwon IC. In vivo targeted delivery of nanoparticles for theranosis. Acc Chem Res 2011; 44:1018-28. [PMID: 21851104 DOI: 10.1021/ar2000138] [Citation(s) in RCA: 306] [Impact Index Per Article: 23.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Therapy and diagnosis are two major categories in the clinical treatment of disease. Recently, the word "theranosis" has been created, combining the words to describe the implementation of these two distinct pursuits simultaneously. For successful theranosis, the efficient delivery of imaging agents and drugs is critical to provide sufficient imaging signal or drug concentration in the targeted disease site. To achieve this purpose, biomedical researchers have developed various nanoparticles composed of organic or inorganic materials. However, the targeted delivery of these nanoparticles in animal models and patients remains a difficult hurdle for many researchers, even if they show useful properties in cell culture condition. In this Account, we review our strategies for developing theranostic nanoparticles to accomplish in vivo targeted delivery of imaging agents and drugs. By applying these rational strategies, we achieved fine multimodal imaging and successful therapy. Our first strategy involves physicochemical optimization of nanoparticles for long circulation and an enhanced permeation and retention (EPR) effect. We accomplished this result by testing various materials in mouse models and optimizing the physical properties of the materials with imaging techniques. Through these experiments, we developed a glycol chitosan nanoparticle (CNP), which is suitable for angiogenic diseases, such as cancers, even without an additional targeting moiety. The in vivo mechanism of this particle was examined through rationally designed experiments. In addition, we evaluated and compared the biodistribution and target-site accumulation of bare and drug-loaded nanoparticles. We then focus on the targeting moieties that bind to cell surface receptors. Small peptides were selected as targeting moieties because of their stability, low cost, size, and activity per unit mass. Through phage display screening, the interleukin-4 receptor binding peptide was discovered, and we combined it with our nanoparticles. This product accumulated efficiently in atherosclerotic regions or tumors during both imaging and therapy. We also developed hyaluronic acid nanoparticles that can bind efficiently to the CD44 antigen receptors abundant in many tumor cells. Their delivery mechanism is based on both physicochemical optimization for the EPR effect and receptor-mediated endocytosis by their hyaluronic acid backbone. Finally, we introduce the stimuli-responsive system related to the chemical and biological changes in the target disease site. Considering the relatively low pH in tumors and ischemic sites, we applied pH-sensitive micelle to optical imaging, magnetic resonance imaging, anticancer drug delivery, and photodynamic therapy. In addition, we successfully evaluated the in vivo imaging of enzyme activity at the target site with an enzyme-specific peptide sequence and CNPs. On the basis of these strategies, we were able to develop self-assembled nanoparticles for in vivo targeted delivery, and successful results were obtained with them in animal models for both imaging and therapy. We anticipate that these rational strategies, as well as our nanoparticles, will be applied in both the diagnosis and therapy of many human diseases. These theranostic nanoparticles are expected to greatly contribute to optimized therapy for individual patients as personalized medicine, in the near future.
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Yuk SH, Oh KS, Koo H, Jeon H, Kim K, Kwon IC. Multi-core vesicle nanoparticles based on vesicle fusion for delivery of chemotherapic drugs. Biomaterials 2011; 32:7924-31. [PMID: 21784512 DOI: 10.1016/j.biomaterials.2011.07.017] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2011] [Accepted: 07/05/2011] [Indexed: 12/31/2022]
Abstract
The Pluronic nanoparticles (NPs) composed of Pluronic (F-68) and liquid polyethylene glycol (PEG, molecular wt: 400) containing docetaxel (DTX) were stabilized with the vesicle fusion. When DTX-loaded Pluronic NPs were mixed with vesicles in the aqueous medium, DTX-loaded Pluronic NPs were incorporated into vesicles to form multi-core vesicle NPs. The morphology and size distribution of multi-core vesicle NPs were observed using FE-SEM, cryo-TEM and a particle size analyzer. To apply multi-core vesicle NPs as a delivery system for DTX, a model anti-cancer drug, the release pattern of DTX was observed and the tumor growth was monitored by injecting the DTX-loaded multi-core vesicle NPs into the tail veins of tumor-bearing mice. We also evaluated the time-dependent excretion profile, in vivo biodistribution, circulation time, and tumor targeting capability of multi-core vesicle NPs using a non-invasive live animal imaging technology.
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Yuk SH, Oh KS, Cho SH, Lee BS, Kim SY, Kwak BK, Kim K, Kwon IC. Glycol chitosan/heparin immobilized iron oxide nanoparticles with a tumor-targeting characteristic for magnetic resonance imaging. Biomacromolecules 2011; 12:2335-43. [PMID: 21506550 DOI: 10.1021/bm200413a] [Citation(s) in RCA: 71] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
We described the preparation of the glycol chitosan/heparin immobilized iron oxide nanoparticles (composite NPs) as a magnetic resonance imaging agent with a tumor-targeting characteristic. The iron oxide nanoseeds used clinically as a magnetic resonance imaging agent were immobilized into the glycol chitosan/heparin network to form the composite NPs. To induce the ionic interaction between the iron oxide nanoseeds and glycol chitosan, gold was deposited on the surface of iron oxide nanoseeds. After the immobilization of gold-deposited iron oxide NPs into the glycol chitosan network, the NPs were stabilized with heparin based on the ionic interaction between cationic glycol chitosan and anionic heparin. FE-SEM (field emission-scanning electron microscopy) and a particle size analyzer were used to observe the formation of the stabilized composite NPs, and a Jobin-Yvon Ultima-C inductively coupled plasma-atomic emission spectrometer (ICP-AES) was used to measure the contents (%) of formed iron oxide nanoseeds as a function of reaction temperature and formed gold deposited on the iron oxide nanoparticles. We also evaluated the time-dependent excretion profile, in vivo biodistribution, circulation time, and tumor-targeting ability of the composite NPs using a noninvasive NIR fluorescence imaging technology. To observe the MRI contrast characteristic, the composite NPs were injected into the tail veins of tumor-bearing mice to demonstrate their selective tumoral distribution. The MR images were collected with conventional T(2)-weighted spin echo acquisition parameters.
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Oh KS, Um YS, Lee JH, Cho SH, Lee KE, Han SS, Kim D, Yuk SH. Core/shell nanoparticles for pH-sensitive delivery of doxorubicin. JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY 2010; 10:6967-6971. [PMID: 21137835 DOI: 10.1166/jnn.2010.2986] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
Core/shell nanoparticles with lipid core were prepared and characterized as pH-sensitive delivery system of anticancer drug. The lipid core is composed of drug-loaded lecithin and the polymeric shell is composed of Pluronics (poly(ethylene oxide)-poly(propylene oxide)-poly(ethylene oxide) tri-block copolymer, F-127). Based on the preparation method in the previous report by us, the freeze-drying of drug-loaded lecithin was performed in the F-127 aqueous solution containing trehalose used as a cryoprotectant to form stabilized core/shell nanoparticles. For the application of core/shell nanoparticles as a pH-sensitive drug delivery system for anticancer drug, doxorubicin was loaded into the core/shell nanoparticles and the drug loading amount and drug release behavior in response to pH change were observed.
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Jeong SY, Kim HJ, Kwak BK, Lee HY, Seong H, Shin BC, Yuk SH, Hwang SJ, Cho SH. Biocompatible Polyhydroxyethylaspartamide-based Micelles with Gadolinium for MRI Contrast Agents. NANOSCALE RESEARCH LETTERS 2010; 5:1970-6. [PMID: 21170410 PMCID: PMC2991228 DOI: 10.1007/s11671-010-9734-7] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/13/2010] [Accepted: 08/05/2010] [Indexed: 05/30/2023]
Abstract
Biocompatible poly-[N-(2-hydroxyethyl)-d,l-aspartamide]-methoxypoly(ethyleneglycol)-hexadecylamine (PHEA-mPEG-C(16)) conjugated with 1,4,7,10-tetraazacyclododecan-1,4,7,10-tetraacetic acid-gadolinium (DOTA-Gd) via ethylenediamine (ED) was synthesized as a magnetic resonance imaging (MRI) contrast agent. Amphiphilic PHEA-mPEG-C(16)-ED-DOTA-Gd forms micelle in aqueous solution. All the synthesized materials were characterized by proton nuclear magnetic resonance ((1)H NMR). Micelle size and shape were examined by dynamic light scattering (DLS) and atomic force microscopy (AFM). Micelles with PHEA-mPEG-C(16)-ED-DOTA-Gd showed higher relaxivities than the commercially available gadolinium contrast agent. Moreover, the signal intensity of a rabbit liver was effectively increased after intravenous injection of PHEA-mPEG-C(16)-ED-DOTA-Gd.
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Oh KS, Song JY, Yoon SJ, Park Y, Kim D, Yuk SH. Temperature-induced gel formation of core/shell nanoparticles for the regeneration of ischemic heart. J Control Release 2010; 146:207-11. [DOI: 10.1016/j.jconrel.2010.04.014] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2009] [Revised: 04/11/2010] [Accepted: 04/13/2010] [Indexed: 12/01/2022]
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Lim SM, Oh SH, Lee HH, Yuk SH, Im GI, Lee JH. Dual growth factor-releasing nanoparticle/hydrogel system for cartilage tissue engineering. JOURNAL OF MATERIALS SCIENCE. MATERIALS IN MEDICINE 2010; 21:2593-2600. [PMID: 20577785 DOI: 10.1007/s10856-010-4118-1] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/02/2010] [Accepted: 06/11/2010] [Indexed: 05/26/2023]
Abstract
In order to induce the chondrogenesis of mesenchymal stem cells (MSCs) in tissue engineering, a variety of growth factors have been adapted and encouraging results have been demonstrated. In this study, we developed a delivery system for dual growth factors using a gelation rate controllable alginate solution (containing BMP-7) and polyion complex nanoparticles (containing TGF-beta(2)) to be applied for the chondrogenesis of MSCs. The dual growth factors (BMP-7/TGF-beta(2))-loaded nanoparticle/hydrogel system showed a controlled release of both growth factors: a faster release of BMP-7 and a slower release of TGF-beta(2), ca., approximately 80 and 30% release at the end of an incubation period (21 days), respectively, which may be highly desirable for chondrogenic differentiation of MSCs. On the contrary, the release of each growth factor from the dual growth factors-loaded hydrogel (without the nanoparticles) was much slower than that of the nanoparticle/hydrogel system, approximately 36% (BMP-7) and 16% (TGF-beta(2)) for 21 days, and this is more than likely attributed to the aggregation between growth factors during the hydrogel fabrication step. The nanoparticle/hydrogel system with separate growth factor loading may provide desirable growth factor delivery kinetics for cartilage regeneration, as well as the chondrogenesis of MSCs.
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Choi WI, Yoon KC, Im SK, Kim YH, Yuk SH, Tae G. Remarkably enhanced stability and function of core/shell nanoparticles composed of a lecithin core and a pluronic shell layer by photo-crosslinking the shell layer: in vitro and in vivo study. Acta Biomater 2010; 6:2666-73. [PMID: 20102749 DOI: 10.1016/j.actbio.2010.01.029] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2009] [Revised: 12/23/2009] [Accepted: 01/20/2010] [Indexed: 11/25/2022]
Abstract
A core/shell nanoparticle system with a lecithin core and a pluronic shell has been previously reported, and it was shown to act as an effective sustained release system for positively charged proteins. Here, to provide improved stability of the core/shell nanoparticle system in a physiological environment, we prepared the core/shell nanoparticle system with a photo-crosslinked shell layer by using a lecithin liposome as the core and pluronic F 127 diacrylate (DA-PF 127) as the shell layer. The DA-PF 127 was then photo-polymerized. Compared with a purely physical system, chemical crosslinking of the shell layer resulted not only in significantly increased structural stability of the core/shell nanoparticles in both an organic co-solvent and in serum but also several remarkably enhanced functioning as a protein delivery system. First, the chemically crosslinked systems were resuspended in aqueous solution after lyophilization without using a cryo-protectant. Second, target proteins were efficiently loaded into the nanoparticles by simple co-incubation in aqueous solution at a low temperature (4 degrees C) and the dried powder form of the protein-loaded nanoparticles was obtained. The loading capacity of the system was increased by more than 10 times compared with that of a purely physical system. Most importantly, the chemically crosslinked system showed more sustained release of the loaded proteins, and the release rate was not noticeably affected by the presence of serum proteins, whereas sustained release of loaded vascular endothelial growth factor (VEGF) in a purely physical system was greatly reduced by serum proteins. In an in vivo corneal angiogenesis assay the chemically crosslinked system loaded with VEGF resulted in more efficient new blood vessel formation than the physical system.
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Chung YI, Kim SK, Lee YK, Park SJ, Cho KO, Yuk SH, Tae G, Kim YH. Efficient revascularization by VEGF administration via heparin-functionalized nanoparticle–fibrin complex. J Control Release 2010; 143:282-9. [DOI: 10.1016/j.jconrel.2010.01.010] [Citation(s) in RCA: 72] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2009] [Revised: 01/04/2010] [Accepted: 01/07/2010] [Indexed: 11/30/2022]
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Reddy AM, Kwak BK, Shim HJ, Ahn C, Cho SH, Kim BJ, Jeong SY, Hwang SJ, Yuk SH. Functional characterization of mesenchymal stem cells labeled with a novel PVP-coated superparamagnetic iron oxide. CONTRAST MEDIA & MOLECULAR IMAGING 2009; 4:118-26. [PMID: 19308999 DOI: 10.1002/cmmi.271] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
Magnetic resonance imaging of cells labeled with superparamagnetic iron oxide (SPIO) could be a valuable tool for tracking transplanted cells in living organisms. Human bone marrow-derived mesenchymal stem cells (hBMMSC) were labeled with a novel polyvinyl pyrrolidone (PVP)-coated SPIO. Prussian blue staining and electron microscopy revealed that almost all of the cells were efficiently labeled with PVP-SPIO nanoparticles. There were no signs of cytotoxicity, even at concentrations of up to 1600 microg Fe/ml of the nanoparticles, and the labeled cells were successfully visualized by in vitro cellular MRI. In addition, there was no significant alteration of the phenotype or the adipo/osteo/chondrogenic differentiation potential of the cells. This was in contrast to Feridex IV labeling that led to the inhibition of hBMMSC chondrogenesis. Following intramuscular injection in a rabbit hind limb ischemia model, the intercellular migration of the labeled cells toward the ablated site was clearly tracked through in vivo MRI. The localization of the transplanted cells observed by MRI correlated well with postmortem histological studies. These results demonstrate that the novel PVP-SPIO nanoparticles appear to be efficient MR contrast agents and may enable non-invasive in vivo tracking of stem cells in experimental and clinical settings during cell therapy.
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Park HY, Oh KS, Koo HM, Cho SH, Chung SJ, Lim YT, Kim D, Yuk SH. Heparin-immobilized pluronic/PVA composite microparticles for the sustained delivery of ionic drug. J Microencapsul 2008; 25:106-10. [DOI: 10.1080/02652040701800917] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Kim BK, Kim D, Cho SH, Yuk SH. Hydrophilized poly(lactide-co-glycolide) nanospheres with poly(ethylene oxide)-poly(propylene oxide)-poly(ethylene oxide) triblock copolymer. J Microencapsul 2008; 21:697-707. [PMID: 15799220 DOI: 10.1080/02652040400000520] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Abstract
A novel method for preparing the PLGA nanospheres with hydrophilic surface has been designed and characterized. Because of good solubility of tetraglycol in water, PLGA (poly(lactide-co-glycolide)) nanospheres were formed by spraying the PLGA/tetraglycol solution into water. The size of PLGA nanospheres was manipulated by changing the concentration of PLGA/tetraglycol solution. Based on the hydrophobic interaction between PLGA and poly(propylene oxide) domain of F-127 (one of Pluronics, poly(ethylene oxide)-poly(propylene oxide)poly(ethylene oxide) triblock copolymer, F-127-coated PLGA nanospheres was prepared to enhance the stability of PLGA nanospheres in the aqueous media. For the application as a drug delivery vehicle, it was characterized by measuring the loading amount, the encapsulation efficiency and the release pattern of drug. Paclitaxel used as a potent anti-cancer drug was selected as a model drug.
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Kang DY, Kim MJ, Kim ST, Oh KS, Yuk SH, Lee S. Size characterization of drug-loaded polymeric core/shell nanoparticles using asymmetrical flow field-flow fractionation. Anal Bioanal Chem 2008; 390:2183-8. [DOI: 10.1007/s00216-008-1984-1] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2007] [Revised: 02/12/2008] [Accepted: 02/14/2008] [Indexed: 11/29/2022]
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Oh KS, Kim RS, Lee J, Kim D, Cho SH, Yuk SH. Gold/chitosan/pluronic composite nanoparticles for drug delivery. J Appl Polym Sci 2008. [DOI: 10.1002/app.27767] [Citation(s) in RCA: 46] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Yoo JY, Shin JH, Khang G, Shin HS, Yuk SH, Kim YS, Kim MS, Rhee JM, Lee HB. Effect of glycolide monomer on release behavior of gentamicin sulfate-loaded PLGA microparticles. J Appl Polym Sci 2007. [DOI: 10.1002/app.24804] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Oh KS, Han SK, Lee HS, Koo HM, Kim RS, Lee KE, Han SS, Cho SH, Yuk SH. Core/Shell nanoparticles with lecithin lipid cores for protein delivery. Biomacromolecules 2006; 7:2362-7. [PMID: 16903683 DOI: 10.1021/bm060362k] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Core/shell nanoparticles with lipid core, were prepared and characterized as a sustained delivery system for protein. The lipid core is composed of protein-loaded lecithin and the polymeric shell is composed of Pluronics (poly(ethylene oxide)-poly(propylene oxide)-poly(ethylene oxide) triblock copolymer, F-127). Based on the preparation method in the previous report by us, the freeze-drying of protein-loaded lecithin was performed in the F-127 aqueous solution containing trehalose used as a cryoprotectant to form stabilized core/shell nanoparticles. Cryo-TEM (transmittance electron microscopy) and a particle size analyzer were used to observe the formation of stabilized core/shell nanoparticles. For the application of core/shell nanoparticles as a protein drug carrier, lysozyme and vascular endothelial growth factor (VEGF) were loaded into the core/shell nanoparticles by electrostatic interaction, and the drug release pattern was observed by manipulating the polymeric shell.
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Lee HY, Lim NH, Seo JA, Yuk SH, Kwak BK, Khang G, Lee HB, Cho SH. Preparation and magnetic resonance imaging effect of polyvinylpyrrolidone-coated iron oxide nanoparticles. J Biomed Mater Res B Appl Biomater 2006; 79:142-50. [PMID: 16767710 DOI: 10.1002/jbm.b.30524] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Polyvinylpyrrolidone (PVP)-coated iron oxide nanoparticles were prepared by the thermal decomposition of Fe(CO)(5) (iron pentacarbonyl) in one step. X-ray diffraction (XRD), transmission electron microscopy (TEM), electrophoretic light scattering (ELS), infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS) together with the variation of the molar ratio of PVP/Fe(CO)(5), solvent, and molecular weight of PVP, were used to characterize the PVP-coated iron oxide nanoparticles. Fifty to hundred nanometer-sized iron oxide nanoclusters with a spherical shape were formed in dimethylformamide (DMF), used as a solvent, and exhibited an enhanced stability in the aqueous media. Their magnetic properties were investigated by superconducting quantum interface device (SQUID). The in vitro cytotoxicity test revealed that the PVP-coated iron oxide nanoparticles exhibited excellent biocompatibility by MTT assay. Magnetic resonance imaging (MRI) effect was observed with the administration of PVP-coated iron oxide nanoparticles through the marginal vein of rabbit, resulting in improved detection of the liver lesions.
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