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Dembélé J, Liao JH, Liu TP, Chen YP. Overcoming Cytosolic Delivery Barriers of Proteins Using Denatured Protein-Conjugated Mesoporous Silica Nanoparticles. ACS APPLIED MATERIALS & INTERFACES 2023; 15:432-451. [PMID: 36562665 PMCID: PMC9896485 DOI: 10.1021/acsami.2c17544] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/28/2022] [Accepted: 12/09/2022] [Indexed: 06/17/2023]
Abstract
Intracellular delivery of therapeutic proteins has increased advantages over current small-molecule drugs and gene therapies, especially in therapeutic efficacies for a broad spectrum of diseases. Hence, developing the protein therapeutics approach provides a needed alternative. Here, we designed a mesoporous silica nanoparticle (MSN)-mediated protein delivery approach and demonstrated effective intracellular delivery of the denatured superoxide dismutase (SOD) protein, overcoming the delivery challenges and achieving higher enzymatic activity than native SOD-conjugated MSNs. The denatured SOD-conjugated MSN delivery strategy provides benefits of reduced size and steric hindrance, increased protein flexibility without distorting its secondary structure, exposure of the cell-penetrating peptide transactivator of transcription for enhanced efficient delivery, and a change in the corona protein composition, enabling cytosolic delivery. After delivery, SOD displayed a specific activity around threefold higher than in our previous reports. Furthermore, the in vivo biosafety and therapeutic potential for neuron therapy were evaluated, demonstrating the biocompatibility and the effective antioxidant effect in Neuro-2a cells that protected neurite outgrowth from paraquat-induced reactive oxygen species attack. This study offers an opportunity to realize the druggable possibility of cytosolic proteins using MSNs.
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Affiliation(s)
- Julien Dembélé
- Graduate
Institute of Biomedical Materials & Tissue Engineering, College
of Biomedical Engineering, Taipei Medical
University, Taipei 11031, Taiwan
- Laboratory
of Toxicology, Environment and Health, Doctorate School of Health, University Joseph Ki-Zerbo, Ouaga 03 BP 7021, Burkina Faso
| | - Jou-Hsuan Liao
- Department
of Chemistry, National Taiwan University, Taipei 10617, Taiwan
| | - Tsang-Pai Liu
- Department
of Surgery, Mackay Memorial Hospital, Taipei 10449, Taiwan
| | - Yi-Ping Chen
- Graduate
Institute of Nanomedicine and Medical Engineering, Taipei Medical University, Taipei 11031, Taiwan
- International
PhD Program in Biomedical Engineering, College of Biomedical Engineering, Taipei Medical University, Taipei 11031, Taiwan
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2
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Kang J, Wang Y, Peng F, Zhang N, Xue Y, Yang Y, Kumacheva E, Liu K. Oxidative Elimination and Reductive Addition of Thiol‐Terminated Polymer Ligands to Metal Nanoparticles. Angew Chem Int Ed Engl 2022; 61:e202202405. [DOI: 10.1002/anie.202202405] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2022] [Indexed: 11/10/2022]
Affiliation(s)
- Jing Kang
- State Key Laboratory of Supramolecular Structure and Materials College of Chemistry Jilin University Changchun 130012 P. R. China
| | - Yu‐Xi Wang
- State Key Laboratory of Supramolecular Structure and Materials College of Chemistry Jilin University Changchun 130012 P. R. China
| | - Fei Peng
- State Key Laboratory of Supramolecular Structure and Materials College of Chemistry Jilin University Changchun 130012 P. R. China
| | - Ning‐Ning Zhang
- State Key Laboratory of Supramolecular Structure and Materials College of Chemistry Jilin University Changchun 130012 P. R. China
| | - Yao Xue
- State Key Laboratory of Supramolecular Structure and Materials College of Chemistry Jilin University Changchun 130012 P. R. China
| | - Yang Yang
- State Key Laboratory of Supramolecular Structure and Materials College of Chemistry Jilin University Changchun 130012 P. R. China
| | - Eugenia Kumacheva
- Department of Chemistry University of Toronto 80 Saint George Street Toronto Ontario M5S 3H6 Canada
- The Institute of Biomaterials and Biomedical Engineering University of Toronto 4 Taddle Creek Road Toronto Ontario M5S 3G9 Canada
- Department of Chemical Engineering and Applied Chemistry University of Toronto 200 College Street Toronto Ontario M5S 3E5 Canada
| | - Kun Liu
- State Key Laboratory of Supramolecular Structure and Materials College of Chemistry Jilin University Changchun 130012 P. R. China
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3
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Kang J, Wang Y, Peng F, Zhang NN, Xue Y, Yang Y, Kumacheva E, Liu K. Oxidative Elimination and Reductive Addition of Thiol‐Terminated Polymer Ligands to Metal Nanoparticles. Angew Chem Int Ed Engl 2022. [DOI: 10.1002/ange.202202405] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Jing Kang
- Jilin University State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry CHINA
| | - Yuxi Wang
- Jilin University State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry CHINA
| | - Fei Peng
- Jilin University State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry CHINA
| | - Ning-Ning Zhang
- Jilin University State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry CHINA
| | - Yao Xue
- Jilin University State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry CHINA
| | - Yang Yang
- Jilin University State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry CHINA
| | | | - Kun Liu
- Jilin University State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry CHINA
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4
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Qiu X, Yu Y, Liu H, Li X, Sun W, Wu W, Liu C, Miao L. Remodeling the periodontitis microenvironment for osteogenesis by using a reactive oxygen species-cleavable nanoplatform. Acta Biomater 2021; 135:593-605. [PMID: 34390848 DOI: 10.1016/j.actbio.2021.08.009] [Citation(s) in RCA: 29] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2021] [Revised: 07/29/2021] [Accepted: 08/05/2021] [Indexed: 12/31/2022]
Abstract
Modestly removing the excessive reactive oxygen species (ROS) plays a crucial role in regulating the microenvironment of periodontitis and provides favorable conditions for osteogenesis. However, the current strategy for scavenging ROS is not controllable, substantially limiting the outcomes in periodontitis. Herein, we introduced a controllable ROS-scavenging nanoplatform by encasing N-acetylcysteine (NAC, (a well-known ROS scavenger) into tailor-made ROS-cleavable amphiphilic polymer nanoparticles (PEG-ss-PCL NPs) as an intracellular delivery carrier. The existing ROS in the inflammatory microenvironment facilitated polymer degradation via breakage of thioketal bonds, and then led to encapsulated NAC release. NAC eliminated all ROS induced by lipopolysaccharide (LPS), while PssL-NAC adjusted the ROS level slightly higher than that of the control group. The percentage of apoptotic cells cultured with NAC and PssL-NAC decreased observably compared with that of cells cultured with 10 µg/ml LPS. The microenvironment regulated by PssL-NAC was highly suitable for osteogenic differentiation based on PCR and Western blot results, which showed higher expression levels of BMP2, Runx2, and PKA. Analysis of ALP activity and Alizarin red S staining showed consistent results. Additionally, the injection of PssL-NAC into the periodontitis area could alleviate the tissue destruction induced by ligation of the maxillary second molar. PssL-NAC showed a better ability to decrease osteoclast activity and inflammation, consequently improving the restoration of destroyed tissue. Our study suggests that ROS-responsive polymer nanoparticles loaded with NAC (PssL-NAC) can be new promising materials for the treatment of periodontitis. STATEMENT OF SIGNIFICANCE: More and more studies indicate that periodontal tissue damage is closely related to the high reactive oxygen species (ROS) environment. Excessive ROS will aggravate periodontal tissue damage and is not conducive to tissue repair. However, as an essential signal molecule in human physiological activities, ROS absence is also useless for tissue repair. In this study, we proposed to improve ROS imbalance in the environment of periodontitis as a strategy to promote periodontal regeneration and successfully synthesized a smart drug-releasing nanoplatform that can respond to ROS. Besides, we validated its ability to regulate the ROS environment and promote osteogenesis through experimental data in vivo and in vitro.
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Kumar R, Mondal K, Panda PK, Kaushik A, Abolhassani R, Ahuja R, Rubahn HG, Mishra YK. Core-shell nanostructures: perspectives towards drug delivery applications. J Mater Chem B 2020; 8:8992-9027. [PMID: 32902559 DOI: 10.1039/d0tb01559h] [Citation(s) in RCA: 74] [Impact Index Per Article: 18.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Nanosystems have shown encouraging outcomes and substantial progress in the areas of drug delivery and biomedical applications. However, the controlled and targeted delivery of drugs or genes can be limited due to their physicochemical and functional properties. In this regard, core-shell type nanoparticles are promising nanocarrier systems for controlled and targeted drug delivery applications. These functional nanoparticles are emerging as a particular class of nanosystems because of their unique advantages, including high surface area, and easy surface modification and functionalization. Such unique advantages can facilitate the use of core-shell nanoparticles for the selective mingling of two or more different functional properties in a single nanosystem to achieve the desired physicochemical properties that are essential for effective targeted drug delivery. Several types of core-shell nanoparticles, such as metallic, magnetic, silica-based, upconversion, and carbon-based core-shell nanoparticles, have been designed and developed for drug delivery applications. Keeping the scope, demand, and challenges in view, the present review explores state-of-the-art developments and advances in core-shell nanoparticle systems, the desired structure-property relationships, newly generated properties, the effects of parameter control, surface modification, and functionalization, and, last but not least, their promising applications in the fields of drug delivery, biomedical applications, and tissue engineering. This review also supports significant future research for developing multi-core and shell-based functional nanosystems to investigate nano-therapies that are needed for advanced, precise, and personalized healthcare systems.
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Affiliation(s)
- Raj Kumar
- Faculty of Engineering and Institute of Nanotechnology and Advanced Materials, Bar Ilan University, Ramat Gan-52900, Israel.
| | - Kunal Mondal
- Materials Science and Engineering Department, Idaho National Laboratory, Idaho Falls, ID 83415, USA.
| | - Pritam Kumar Panda
- Condensed Matter Theory Group, Materials Theory Division, Department of Physics and Astronomy, Uppsala University, Box 516, SE-75120, Uppsala, Sweden
| | - Ajeet Kaushik
- NanoBioTech Laboratory, Department of Natural Sciences, Division of Sciences, Art, & Mathematics, Florida Polytechnic University, Lakeland, FL-33805, USA
| | - Reza Abolhassani
- Mads Clausen Institute, NanoSYD, University of Southern Denmark, Alsion 2, DK-6400, Sønderborg, Denmark.
| | - Rajeev Ahuja
- Condensed Matter Theory Group, Materials Theory Division, Department of Physics and Astronomy, Uppsala University, Box 516, SE-75120, Uppsala, Sweden and Applied Materials Physics, Department of Materials Science and Engineering, Royal Institute of Technology (KTH), SE-10044 Stockholm, Sweden
| | - Horst-Günter Rubahn
- Mads Clausen Institute, NanoSYD, University of Southern Denmark, Alsion 2, DK-6400, Sønderborg, Denmark.
| | - Yogendra Kumar Mishra
- Mads Clausen Institute, NanoSYD, University of Southern Denmark, Alsion 2, DK-6400, Sønderborg, Denmark.
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Díaz SA, Sen S, Boeneman Gemmill K, Brown CW, Oh E, Susumu K, Stewart MH, Breger JC, Lasarte Aragonés G, Field LD, Deschamps JR, Král P, Medintz IL. Elucidating Surface Ligand-Dependent Kinetic Enhancement of Proteolytic Activity at Surface-Modified Quantum Dots. ACS NANO 2017; 11:5884-5896. [PMID: 28603969 DOI: 10.1021/acsnano.7b01624] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Combining biomolecules such as enzymes with nanoparticles has much to offer for creating next generation synergistically functional bionanomaterials. However, almost nothing is known about how these two disparate components interact at this critical biomolecular-materials interface to give rise to improved activity and emergent properties. Here we examine how the nanoparticle surface can influence and increase localized enzyme activity using a designer experimental system consisting of trypsin proteolysis acting on peptide-substrates displayed around semiconductor quantum dots (QDs). To minimize the complexity of analyzing this system, only the chemical nature of the QD surface functionalizing ligands were modified. This was accomplished by synthesizing a series of QD ligands that were either positively or negatively charged, zwitterionic, neutral, and with differing lengths. The QDs were then assembled with different ratios of dye-labeled peptide substrates and exposed to trypsin giving rise to progress curves that were monitored by Förster resonance energy transfer (FRET). The resulting trypsin activity profiles were analyzed in the context of detailed molecular dynamics simulations of key interactions occurring at this interface. Overall, we find that a combination of factors can give rise to a localized activity that was 35-fold higher than comparable freely diffusing enzyme-substrate interactions. Contributing factors include the peptide substrate being prominently displayed extending from the QD surface and not sterically hindered by the longer surface ligands in conjunction with the presence of electrostatic and other productive attractive forces between the enzyme and the QD surface. An intimate understanding of such critical interactions at this interface can produce a set of guidelines that will allow the rational design of next generation high-activity bionanocomposites and theranostics.
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Affiliation(s)
- Sebastián A Díaz
- American Society for Engineering Education , Washington, D.C. 20036, United States
| | | | | | - Carl W Brown
- College of Science George Mason University , Fairfax, Virginia 22030, United States
| | - Eunkeu Oh
- Sotera Defense Solutions, Inc. , Columbia, Maryland 21046, United States
| | - Kimihiro Susumu
- Sotera Defense Solutions, Inc. , Columbia, Maryland 21046, United States
| | | | | | | | - Lauren D Field
- Fischell Department of Bioengineering, University of Maryland , College Park, Maryland 20742, United States
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Horiguchi Y, Nakayama N, Kanayama N, Nagasaki Y. Sulfobetaine-terminated PEG improves the qualities of an immunosensing surface. Biomater Sci 2016; 2:819-26. [PMID: 26827755 DOI: 10.1039/c3bm60212e] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Poly(ethylene glycol) (PEG) possessing a sulfobetaine (SB) moiety at one end and a pentaethylenehexamine (N6) at the other end (SB-PEG-N6) was newly synthesized as a blocking agent for immunosensing surfaces. The N6 moiety strongly coordinates on gold surfaces, facilitating the tethering of the PEG chain to the sensor chip surface, and leaves the SB moiety free. Non-specific adsorption of bovine serum albumin (BSA) was analyzed on the SB-PEG-N6 tethered surface and compared with the methoxy-PEG-N6 (M-PEG-N6) tethered surface using a surface plasmon resonance (SPR) sensor. Non-specific BSA adsorption decreased with decreasing PEG chain length on the SB-PEG tethered chain surface. Non-specific adsorption of BSA decreased as ionic strength increased on SB-PEG-N6 surfaces; this phenomenon was completely opposite to that observed with an M-PEG-N6 tethered chain surface. The results show that SB moieties located close to the gold surface perform well with regard to protein rejection. Actually, low-molecular weight alkane thiol SB (SB-SH) showed minimum BSA adsorption. To evaluate protein recognition efficacy on a PEGylated surface, an antibody (IgG) immobilized surface was then constructed on a gold sensor chip using SB-PEG-N6 as the blocking agent. The specific protein recognition efficacy of SB-PEG-N6/IgG co-immobilized surfaces was higher than that obtained using SB-SH/IgG co-immobilized surfaces. We conclude that SB-terminated PEG exhibits the optimal qualities of a blocking agent, as it possesses both high suppression efficacy of nonspecific protein adsorption and specific protein recognition ability.
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Affiliation(s)
- Yukichi Horiguchi
- Graduate School of Pure and Applied Sciences, University of Tsukuba, Ten-noudai 1-1-1, Tsukuba, Ibaraki 305-8573, Japan
| | - Naoki Nakayama
- Graduate School of Pure and Applied Sciences, University of Tsukuba, Ten-noudai 1-1-1, Tsukuba, Ibaraki 305-8573, Japan
| | - Naoki Kanayama
- Graduate School of Pure and Applied Sciences, University of Tsukuba, Ten-noudai 1-1-1, Tsukuba, Ibaraki 305-8573, Japan
| | - Yukio Nagasaki
- Graduate School of Pure and Applied Sciences, University of Tsukuba, Ten-noudai 1-1-1, Tsukuba, Ibaraki 305-8573, Japan and Master's School of Medical Sciences, University of Tsukuba, Ten-noudai 1-1-1, Tsukuba, Ibaraki 305-8573, Japan and Satellite Laboratory of International Center for Materials Nanoarchitectonics (WPI-MANA), National Institute of Materials Science (NIMS), Ten-noudai 1-1-1, Tsukuba, Ibaraki 305-8573, Japan.
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8
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Ghosh B, Shirahata N. Colloidal silicon quantum dots: synthesis and luminescence tuning from the near-UV to the near-IR range. SCIENCE AND TECHNOLOGY OF ADVANCED MATERIALS 2014; 15:014207. [PMID: 27877634 PMCID: PMC5090595 DOI: 10.1088/1468-6996/15/1/014207] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/02/2013] [Revised: 01/17/2014] [Accepted: 11/21/2013] [Indexed: 05/23/2023]
Abstract
This review describes a series of representative synthesis processes, which have been developed in the last two decades to prepare silicon quantum dots (QDs). The methods include both top-down and bottom-up approaches, and their methodological advantages and disadvantages are presented. Considerable efforts in surface functionalization of QDs have categorized it into (i) a two-step process and (ii) in situ surface derivatization. Photophysical properties of QDs are summarized to highlight the continuous tuning of photoluminescence color from the near-UV through visible to the near-IR range. The emission features strongly depend on the silicon nanostructures including QD surface configurations. Possible mechanisms of photoluminescence have been summarized to ascertain the future challenges toward industrial use of silicon-based light emitters.
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Affiliation(s)
- Batu Ghosh
- International Center for Materials Nanoarchitectonics (WPI-MANA), 1-1 Namiki, Tsukuba, 305-0044, Japan
| | - Naoto Shirahata
- International Center for Materials Nanoarchitectonics (WPI-MANA), 1-1 Namiki, Tsukuba, 305-0044, Japan
- National Institute for Materials Science (NIMS), 1-2-1 Sengen, Tsukuba, 305-0047, Japan
- PRESTO, Japan Science and Technology Agency (JST), 4-1-8 Honcho Kawaguchi, Saitama, 332-0012, Japan
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Otsuka H, Sanbai T, Matsukuma D, Ikenaga Y. Self-assembly of poly(ethylene glycol)-block-polypyridine copolymer into micelles and at silica surface: effect of molecular architecture on silica dispersion. Colloid Polym Sci 2013. [DOI: 10.1007/s00396-013-3062-2] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
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10
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Horiguchi Y, Miyachi S, Nagasaki Y. High-performance surface acoustic wave immunosensing system on a PEG/aptamer hybridized surface. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2013; 29:7369-7376. [PMID: 23414210 DOI: 10.1021/la304548m] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
Label-free immunoassay systems have the advantages of procedural simplicity and a low construction cost of surfaces for immunosensing. When label-free immunoassay systems are considered, the nonspecific adsorption of unwanted materials should be eliminated unless it aids in the detection of error. PEG is well-known as a blocking agent for the prevention of the adsorption of nonspecific binding materials when coimmobilized with ligands for targets such as antibodies and oligonucleotides. The construction strategy for PEG/ligand coimmobilized surfaces is an important point in the preparation of a high-performance assays because the physiological condition of the ligand depends strongly on its interaction with the PEG chain. In this report, we investigate the interaction between thrombin and a thrombin-binding aptamer (TBA) on a PEG/TBA coimmobilized surface by using a shear horizontal surface acoustic wave (SAW) sensor. The thrombin-TBA binding property shows remarkable differences with changes in the PEG density and the distance from the gold surface to the aptamer.
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Affiliation(s)
- Yukichi Horiguchi
- Graduate School of Pure and Applied Sciences, University of Tsukuba, Tsukuba, Japan
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11
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Wilms VS, Frey H. Aminofunctional polyethers: smart materials for applications in solution and on surfaces. POLYM INT 2013. [DOI: 10.1002/pi.4496] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Valerie S. Wilms
- Johannes-Gutenberg-University Mainz, Department of Organic Chemistry; Duesbergweg 10-14, 55099 Mainz, and Graduate School ‘Materials Science in Mainz’; Staudingerweg 9 55128 Mainz Germany
| | - Holger Frey
- Johannes-Gutenberg-University Mainz, Department of Organic Chemistry; Duesbergweg 10-14, 55099 Mainz, and Graduate School ‘Materials Science in Mainz’; Staudingerweg 9 55128 Mainz Germany
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12
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Reuss VS, Werre M, Frey H. Thermoresponsive Copolymers of Ethylene Oxide andN,N-Diethyl Glycidyl Amine: Polyether Polyelectrolytes and PEGylated Gold Nanoparticle Formation. Macromol Rapid Commun 2012; 33:1556-61. [DOI: 10.1002/marc.201200307] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2012] [Revised: 05/21/2012] [Indexed: 11/10/2022]
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13
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Nagasaki Y. Construction of a densely poly(ethylene glycol)-chain-tethered surface and its performance. Polym J 2011. [DOI: 10.1038/pj.2011.93] [Citation(s) in RCA: 95] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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14
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Kamimura M, Kanayama N, Tokuzen K, Soga K, Nagasaki Y. Near-infrared (1550 nm) in vivo bioimaging based on rare-earth doped ceramic nanophosphors modified with PEG-b-poly(4-vinylbenzylphosphonate). NANOSCALE 2011; 3:3705-13. [PMID: 21792433 DOI: 10.1039/c1nr10466g] [Citation(s) in RCA: 48] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/15/2023]
Abstract
A novel poly(ethylene glycol) (PEG)-based block copolymer possessing a 4-vinylbenzylphosphonate repeating unit in another segment (PEG-block-poly(4-vinylbenzylphosphonate)) (PEG-b-PVBP) was designed and successfully synthesized. As a control, an end-functionalized PEG possessing a mono-phosphonate group (PEG-PO(3)H(2)) was also synthesized. The surface of near-infrared (NIR) phosphors (i.e., ytterbium (Yb) and erbium (Er) ion-codoped Y(2)O(3) nanoparticles (YNPs)) were modified with PEG-b-PVBP (PEG-YNP(b)s) and PEG-PO(3)H(2) (PEG-YNP(1)s). The adsorption of PEG-b-PVBP and PEG-PO(3)H(2) was estimated by Fourier transform infrared (FT-IR) measurements and thermal gravimetric analysis (TGA). The physicochemical characteristics of the obtained YNP samples were analyzed by ζ-potential and dynamic light scattering (DLS) measurements. The ζ-potentials of YNPs modified by these polymers were close to zero, indicating the effective coverage of the YNP surface by our new PEG derivatives. However, the dispersion stability of the PEGylated YNPs was strongly affected by the structure of the PEG terminus. The average diameter of the PEG-YNP(1)s increased, and aggregates precipitated after less than 1 h in phosphate buffer saline (PBS). In contrast, the size did not change at all in the case of PEG-YNP(b)s and the dispersion in PBS was stable for over 1 week. PEG-YNP(b)s also showed high erosion resistance under acidic conditions. The multiple coordinated PVBP segment of the block copolymer on the YNP surface plays a substantial role in improving such dispersion stability. The excellent dispersion stability and strong NIR luminescence of the obtained PEG-YNP(b)s were also confirmed in fetal bovine serum (FBS) solution over 1 week. Furthermore, in vivo NIR imaging of live mice was performed, and the 1550 nm NIR emission of PEG-YNP(b)s from the organ of live mice was confirmed without dissection.
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Affiliation(s)
- Masao Kamimura
- Department of Materials Science, Graduate School of Pure and Applied Sciences, University of Tsukuba, Tennoudai 1-1-1, Tsukuba, Ibaraki 305-8573, Japan
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15
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Horiguchi Y, Kudo S, Nagasaki Y. Gd@C 82 metallofullerenes for neutron capture therapy-fullerene solubilization by poly(ethylene glycol)-block-poly(2-( N, N-diethylamino)ethyl methacrylate) and resultant efficacy in vitro. SCIENCE AND TECHNOLOGY OF ADVANCED MATERIALS 2011; 12:044607. [PMID: 27877415 PMCID: PMC5090493 DOI: 10.1088/1468-6996/12/4/044607] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/28/2011] [Revised: 07/07/2011] [Accepted: 05/08/2011] [Indexed: 05/19/2023]
Abstract
Poly(ethylene glycol)-block-poly(2-(N,N-diethylamino)ethyl methacrylate) (PEG-b-PAMA) was found to solubilize fullerenes such as C60, and this technique was applied to metallofullerenes. Gd@C82 was easily dissolved in water in the presence of PEG-b-PAMA without any covalent derivatization, forming a transparent complex about 20-30 nm in diameter. Low cytotoxicity was confirmed in vitro. Neutron irradiation of cultured cells (colon-26 adenocarcinoma) with Gd@C82-PEG-b-PAMA-complexed nanoparticles showed effective cytotoxicity, indicating the effective emission of gamma rays and internal conversion electrons produced from the neutron capture reaction of Gd. This result suggests a potentially valuable approach to gadolinium-based neutron capture therapy.
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Affiliation(s)
- Yukichi Horiguchi
- Graduate School of Pure and Applied Sciences University of Tsukuba, Ten-noudai 1-1-1, Tsukuba, Ibaraki 305-8573, Japan
| | - Shinpei Kudo
- Graduate School of Pure and Applied Sciences University of Tsukuba, Ten-noudai 1-1-1, Tsukuba, Ibaraki 305-8573, Japan
| | - Yukio Nagasaki
- Graduate School of Pure and Applied Sciences University of Tsukuba, Ten-noudai 1-1-1, Tsukuba, Ibaraki 305-8573, Japan
- Master's School of Medical Sciences, University of Tsukuba, Ten-noudai 1-1-1, Tsukuba, Ibaraki 305-8573, Japan
- Satellite Laboratory of International Center for Materials Nanoarchitectonics (MANA), National Institute of Materials Science (NIMS), Ten-noudai 1-1-1, Tsukuba, Ibaraki 305-8573, Japan
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