651
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652
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Mendrek S, Mendrek A, Adler HJ, Dworak A, Kuckling D. Temperature-sensitive behaviour of poly(glycidol)-b-poly(N-isopropylacrylamide) block copolymers. Colloid Polym Sci 2010. [DOI: 10.1007/s00396-010-2203-0] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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653
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Rapoport N, Christensen DA, Kennedy AM, Nam KH. Cavitation properties of block copolymer stabilized phase-shift nanoemulsions used as drug carriers. ULTRASOUND IN MEDICINE & BIOLOGY 2010; 36:419-29. [PMID: 20133040 PMCID: PMC2826577 DOI: 10.1016/j.ultrasmedbio.2009.11.009] [Citation(s) in RCA: 64] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/22/2008] [Revised: 11/17/2009] [Accepted: 11/20/2009] [Indexed: 05/05/2023]
Abstract
Cavitation properties of block copolymer stabilized perfluoropentane nanoemulsions have been investigated. The nanoemulsions were stabilized by two biodegradable amphiphilic block copolymers differing in the structure of the hydrophobic block, poly(ethylene oxide)-co-poly(L-lactide) (PEG-PLLA) and poly(ethylene oxide)-co-polycaprolactone (PEG-PCL). Cavitation parameters were measured in liquid emulsions and gels as a function of ultrasound pressure for unfocused or focused 1-MHz ultrasound. Acoustic droplet vaporization preceded generation of acoustic cavitation in liquid matrices and gels. Both stable and inertial cavitation was observed for focused ultrasound while only stable cavitation was observed for unfocused ultrasound.
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Affiliation(s)
- Natalya Rapoport
- Department of Bioengineering, University of Utah, Salt Lake City, UT 84112, USA.
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654
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Zschoche S, Rueda J, Boyko V, Krahl F, Arndt KF, Voit B. Thermo-Responsive Nanogels Based on Poly[NIPAAm-graft-
(2-alkyl-2-oxazoline)]s Crosslinked in the Micellar State. MACROMOL CHEM PHYS 2010. [DOI: 10.1002/macp.200900559] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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655
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Li L, Huh KM, Lee YK, Kim SY. Design of a multifunctional heparin-based nanoparticle system for anticancer drug delivery. Macromol Res 2010. [DOI: 10.1007/s13233-009-0134-8] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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656
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Surface behavior and micelle morphology of novel nonionic polyurethane bolaform amphiphilic block copolymers. JOURNAL OF POLYMER RESEARCH 2010. [DOI: 10.1007/s10965-009-9383-7] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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657
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Rapoport N, Kennedy AM, Shea JE, Scaife CL, Nam KH. Ultrasonic nanotherapy of pancreatic cancer: lessons from ultrasound imaging. Mol Pharm 2010; 7:22-31. [PMID: 19899813 PMCID: PMC2815246 DOI: 10.1021/mp900128x] [Citation(s) in RCA: 67] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
Pancreatic ductal adenocarcinoma (PDA) is the fourth most common cause of cancer death in the United States, with a median survival time of only 3-6 months for forty percent of patients. Current treatments are ineffective, and new PDA therapies are urgently needed. In this context, ultrasound-mediated chemotherapy by polymeric micelles and/or nanoemulsion/microbubble encapsulated drugs may offer an innovative approach to PDA treatment. PDA xenografts were orthotopically grown in the pancreas tails of nu/nu mice by surgical insertion of red fluorescence protein (RFP)-transfected MiaPaCa-2 cells. Tumor growth was controlled by fluorescence imaging. Occasional sonographic measurements correlated well with the formal tumor tracking by red fluorescence. Tumor accumulation of paclitaxel-loaded nanoemulsion droplets and droplet-to-bubble transition under therapeutic ultrasound was monitored by diagnostic ultrasound imaging. MiaPaCa-2 tumors manifested resistance to treatment by gemcitabine (GEM). This drug is the gold standard for PDA therapy. The GEM-resistant tumors proved sensitive to paclitaxel. Among six experimental groups studied, the strongest therapeutic effect was exerted by the following drug formulation: GEM + nanodroplet-encapsulated paclitaxel (nbGEN) combined with tumor-directed 1-MHz ultrasound that was applied for 30 s four to five hours after the systemic drug injection. Ultrasound-mediated PDA therapy by either micellar or nanoemulsion encapsulated paclitaxel resulted in substantial suppression of metastases and ascites, suggesting ultrasound-enhanced killing of invasive cancerous cells. However, tumors relapsed after the completion of therapy, indicating survival of some tumor cells. The recurrent tumors manifested development of paclitaxel resistance. Ultrasound imaging suggested nonuniform distribution of nanodroplets in the tumor volume due to irregular vascularization, which may result in the development of zones with subtherapeutic drug concentration. This is implicated as a possible cause of the resistance development, which may be pertinent to various modes of tumor nanotherapy.
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Affiliation(s)
- Natalya Rapoport
- Department of Bioengineering, University of Utah, and Departments of Clinical Radiology and Surgery, School of Medicine, University of Utah, Salt Lake City, Utah 84112, USA.
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658
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Zhang W, He J, Liu Z, Ni P, Zhu X. Biocompatible and pH-responsive triblock copolymer mPEG-b
-PCL-b
-PDMAEMA: Synthesis, self-assembly, and application. ACTA ACUST UNITED AC 2010. [DOI: 10.1002/pola.23863] [Citation(s) in RCA: 90] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
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659
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Aseyev V, Tenhu H, Winnik FM. Non-ionic Thermoresponsive Polymers in Water. ADVANCES IN POLYMER SCIENCE 2010. [DOI: 10.1007/12_2010_57] [Citation(s) in RCA: 374] [Impact Index Per Article: 26.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
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660
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Xiao ZP, Cai ZH, Liang H, Lu J. Amphiphilic block copolymers with aldehyde and ferrocene-functionalized hydrophobic block and their redox-responsive micelles. ACTA ACUST UNITED AC 2010. [DOI: 10.1039/c0jm01453b] [Citation(s) in RCA: 57] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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661
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Alvarez-Lorenzo C, Concheiro A. Polymeric micelles as drug stabilizers: the camptothecin and simvastatin cases. J Drug Deliv Sci Technol 2010. [DOI: 10.1016/s1773-2247(10)50042-x] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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662
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Li Y, Tong R, Xia H, Zhang H, Xuan J. High intensity focused ultrasound and redox dual responsive polymer micelles. Chem Commun (Camb) 2010; 46:7739-41. [DOI: 10.1039/c0cc02628j] [Citation(s) in RCA: 79] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
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663
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Wang YC, Yuan YY, Du JZ, Yang XZ, Wang J. Recent Progress in Polyphosphoesters: From Controlled Synthesis to Biomedical Applications. Macromol Biosci 2009; 9:1154-64. [DOI: 10.1002/mabi.200900253] [Citation(s) in RCA: 176] [Impact Index Per Article: 11.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
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664
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Balasubramanian V, Onaca O, Enea R, Hughes DW, Palivan CG. Protein delivery: from conventional drug delivery carriers to polymeric nanoreactors. Expert Opin Drug Deliv 2009; 7:63-78. [DOI: 10.1517/17425240903394520] [Citation(s) in RCA: 53] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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665
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Shi D, Liu X, Xiang F, Chen M, Yang C, Akashi M. Studies on Preparation and Fluorescent Properties of a Novel Photo-Sensitive Nanoparticle Composed of Europium Ion and Cinnamic Acid Derivative. MACROMOL CHEM PHYS 2009. [DOI: 10.1002/macp.200900209] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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666
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Kaditi E, Pispas S. β-Lactam functionalized poly(isoprene-b
-ethylene oxide) amphiphilic block copolymers. ACTA ACUST UNITED AC 2009. [DOI: 10.1002/pola.23748] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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667
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Wang J, Pelletier M, Zhang H, Xia H, Zhao Y. High-frequency ultrasound-responsive block copolymer micelle. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2009; 25:13201-5. [PMID: 19572509 DOI: 10.1021/la9018794] [Citation(s) in RCA: 81] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
Micelles of a diblock copolymer composed of poly(ethylene oxide) and poly(2-tetrahydropyranyl methacrylate) (PEO-b-PTHPMA) in aqueous solution could be disrupted by high-frequency ultrasound (1.1 MHz). It was found that, upon exposure to a high-intensity focused ultrasound (HIFU) beam at room temperature, the pH value of the micellar solution decreased over irradiation time. The infrared spectroscopic analysis of solid block copolymer samples collected from the ultrasound irradiated micellar solution revealed the formation of carboxylic acid dimers and hydroxyl groups. These characterization results suggest that the high-frequency HIFU beam could induce the hydrolysis reaction of THPMA at room temperature resulting in the cleavage of THP groups. The disruption of PEO-b-PTHPMA micelles by ultrasound was investigated by using dynamic light scattering, atomic force microscopy, and fluorescence spectroscopy. On the basis of the pH change, it was found that the disruption process was determined by a number of factors such as the ultrasound power, the micellar solution volume and the location of the focal spot of the ultrasound beam. This study shows the potential to develop ultrasound-sensitive block copolymer micelles by having labile chemical bonds in the polymer structure, and to use the high-frequency HIFU to trigger a chemical reaction for the disruption of micelles.
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Affiliation(s)
- Jie Wang
- State Key Laboratory of Polymer Materials Engineering, Polymer Research Institute, Sichuan University, Chengdu 610065, China
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668
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Xu B, Yuan J, Wang Z, Gao Q. Shell-cross-linked amino acid-modified APLA-b-PEG-Cys copolymer micelle as a drug delivery carrier. J Microencapsul 2009; 26:659-66. [DOI: 10.3109/02652040902968968] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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669
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Schroeder A, Kost J, Barenholz Y. Ultrasound, liposomes, and drug delivery: principles for using ultrasound to control the release of drugs from liposomes. Chem Phys Lipids 2009; 162:1-16. [DOI: 10.1016/j.chemphyslip.2009.08.003] [Citation(s) in RCA: 332] [Impact Index Per Article: 22.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2009] [Revised: 08/17/2009] [Accepted: 08/18/2009] [Indexed: 02/07/2023]
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670
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Kaczmarek H, Gałka P, Kowalonek J. Influence of a photoinitiator on the photochemical stability of poly(methyl methacrylate) studied with fourier transform infrared spectroscopy. J Appl Polym Sci 2009. [DOI: 10.1002/app.31166] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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671
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Li L, Jiang X, Zhuo R. Synthesis and characterization of thermoresponsive polymers containing reduction-sensitive disulfide linkage. ACTA ACUST UNITED AC 2009. [DOI: 10.1002/pola.23642] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
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672
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Biodegradable micelles with sheddable poly(ethylene glycol) shells for triggered intracellular release of doxorubicin. Biomaterials 2009; 30:6358-66. [DOI: 10.1016/j.biomaterials.2009.07.051] [Citation(s) in RCA: 385] [Impact Index Per Article: 25.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2009] [Accepted: 07/24/2009] [Indexed: 11/22/2022]
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673
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Bencherif SA, Siegwart DJ, Srinivasan A, Horkay F, Hollinger JO, Washburn NR, Matyjaszewski K. Nanostructured hybrid hydrogels prepared by a combination of atom transfer radical polymerization and free radical polymerization. Biomaterials 2009; 30:5270-8. [PMID: 19592087 PMCID: PMC3632384 DOI: 10.1016/j.biomaterials.2009.06.011] [Citation(s) in RCA: 77] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2009] [Accepted: 06/08/2009] [Indexed: 01/18/2023]
Abstract
A new method to prepare nanostructured hybrid hydrogels by incorporating well-defined poly(oligo (ethylene oxide) monomethyl ether methacrylate) (POEO(300)MA) nanogels of sizes 110-120 nm into a larger three-dimensional (3D) matrix was developed for drug delivery scaffolds for tissue engineering applications. Rhodamine B isothiocyanate-labeled dextran (RITC-Dx) or fluorescein isothiocyanate-labeled dextran (FITC-Dx)-loaded POEO(300)MA nanogels with pendant hydroxyl groups were prepared by activators generated electron transfer atom transfer radical polymerization (AGET ATRP) in cyclohexane inverse miniemulsion. Hydroxyl-containing nanogels were functionalized with methacrylated groups to generate photoreactive nanospheres. (1)H NMR spectroscopy confirmed that polymerizable nanogels were successfully incorporated covalently into 3D hyaluronic acid-glycidyl methacrylate (HAGM) hydrogels after free radical photopolymerization (FRP). The introduction of disulfide moieties into the polymerizable groups resulted in a controlled release of nanogels from cross-linked HAGM hydrogels under a reducing environment. The effect of gel hybridization on the macroscopic properties (swelling and mechanics) was studied. It is shown that swelling and nanogel content are independent of scaffold mechanics. In-vitro assays showed the nanostructured hybrid hydrogels were cytocompatible and the GRGDS (Gly-Arg-Gly-Asp-Ser) contained in the nanogel structure promoted cell-substrate interactions within 4 days of incubation. These nanostructured hydrogels have potential as an artificial extracellular matrix (ECM) impermeable to low molecular weight biomolecules and with controlled pharmaceutical release capability. Moreover, the nanogels can control drug or biomolecule delivery, while hyaluronic acid based-hydrogels can act as a macroscopic scaffold for tissue regeneration and regulator for nanogel release.
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Affiliation(s)
- Sidi A. Bencherif
- Department of Chemistry, Carnegie Mellon University, Pittsburgh, PA 15213, USA
| | - Daniel J. Siegwart
- Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
| | - Abiraman Srinivasan
- Bone Tissue Engineering Center, Carnegie Mellon University, Pittsburgh, PA 15219, USA
| | - Ferenc Horkay
- Section on Tissue Biophysics and Biomimetics, Laboratory of Integrative and Medical Biophysics, NICHD, National Institutes of Health, Bethesda, MD 20892, USA
| | - Jeffrey O. Hollinger
- Bone Tissue Engineering Center, Carnegie Mellon University, Pittsburgh, PA 15219, USA
| | - Newell R. Washburn
- Department of Chemistry, Carnegie Mellon University, Pittsburgh, PA 15213, USA
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674
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Ding M, Li J, Fu X, Zhou J, Tan H, Gu Q, Fu Q. Synthesis, Degradation, and Cytotoxicity of Multiblock Poly(ε-caprolactone urethane)s Containing Gemini Quaternary Ammonium Cationic Groups. Biomacromolecules 2009; 10:2857-65. [DOI: 10.1021/bm9006826] [Citation(s) in RCA: 90] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Affiliation(s)
- Mingming Ding
- College of Polymer Science and Engineering, State Key Laboratory of Polymer Materials Engineering, Sichuan Unversity, Chengdu 610065, China, and Ningbo Institute of Material Technology and Engineering, Chinese Academy of Sciences, Ningbo Key Laboratory of Polymer Materials, Ningbo 315201, China
| | - Jiehua Li
- College of Polymer Science and Engineering, State Key Laboratory of Polymer Materials Engineering, Sichuan Unversity, Chengdu 610065, China, and Ningbo Institute of Material Technology and Engineering, Chinese Academy of Sciences, Ningbo Key Laboratory of Polymer Materials, Ningbo 315201, China
| | - Xiaoting Fu
- College of Polymer Science and Engineering, State Key Laboratory of Polymer Materials Engineering, Sichuan Unversity, Chengdu 610065, China, and Ningbo Institute of Material Technology and Engineering, Chinese Academy of Sciences, Ningbo Key Laboratory of Polymer Materials, Ningbo 315201, China
| | - Jian Zhou
- College of Polymer Science and Engineering, State Key Laboratory of Polymer Materials Engineering, Sichuan Unversity, Chengdu 610065, China, and Ningbo Institute of Material Technology and Engineering, Chinese Academy of Sciences, Ningbo Key Laboratory of Polymer Materials, Ningbo 315201, China
| | - Hong Tan
- College of Polymer Science and Engineering, State Key Laboratory of Polymer Materials Engineering, Sichuan Unversity, Chengdu 610065, China, and Ningbo Institute of Material Technology and Engineering, Chinese Academy of Sciences, Ningbo Key Laboratory of Polymer Materials, Ningbo 315201, China
| | - Qun Gu
- College of Polymer Science and Engineering, State Key Laboratory of Polymer Materials Engineering, Sichuan Unversity, Chengdu 610065, China, and Ningbo Institute of Material Technology and Engineering, Chinese Academy of Sciences, Ningbo Key Laboratory of Polymer Materials, Ningbo 315201, China
| | - Qiang Fu
- College of Polymer Science and Engineering, State Key Laboratory of Polymer Materials Engineering, Sichuan Unversity, Chengdu 610065, China, and Ningbo Institute of Material Technology and Engineering, Chinese Academy of Sciences, Ningbo Key Laboratory of Polymer Materials, Ningbo 315201, China
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675
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Fujioka T, Taketani S, Nagasaki T, Matsumoto A. Self-Assembly and Cellular Uptake of Degradable and Water-Soluble Polyperoxides. Bioconjug Chem 2009; 20:1879-87. [DOI: 10.1021/bc9001618] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Tamami Fujioka
- Department of Applied Chemistry and Bioengineering, Graduate School of Engineering, Osaka City University, 3-3-138, Sugimoto, Sumiyoshi-ku, Osaka 558-8585, Japan
| | - Shuji Taketani
- Department of Applied Chemistry and Bioengineering, Graduate School of Engineering, Osaka City University, 3-3-138, Sugimoto, Sumiyoshi-ku, Osaka 558-8585, Japan
| | - Takeshi Nagasaki
- Department of Applied Chemistry and Bioengineering, Graduate School of Engineering, Osaka City University, 3-3-138, Sugimoto, Sumiyoshi-ku, Osaka 558-8585, Japan
| | - Akikazu Matsumoto
- Department of Applied Chemistry and Bioengineering, Graduate School of Engineering, Osaka City University, 3-3-138, Sugimoto, Sumiyoshi-ku, Osaka 558-8585, Japan
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676
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Gamage P, Basel MT, Lovell K, Pokhrel MR, Battle D, Ito T, Pavlenok M, Niederweis M, Bossmann SH. Poly-N-Isopropylacrylamide/acrylic Acid Copolymers for the Generation of Nanostructures at Mica Surfaces and as Hydrophobic Host Systems for the Porin MspA from Mycobacterium smegmatis. THE JOURNAL OF PHYSICAL CHEMISTRY. C, NANOMATERIALS AND INTERFACES 2009; 113:16485-16494. [PMID: 20161351 PMCID: PMC2776743 DOI: 10.1021/jp9057687] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
The work presented here aims at utilizing poly-N-isopropyl-acrylamide/acrylic acid copolymers to create nanostructured layers on mica surfaces by a simple spin-casting procedure. The average composition of the copolymers determined by elemental analysis correlates excellently with the feed composition indicating that the radical polymerization process is statistical. The resulting surfaces were characterized by Atomic Force Microscopy (magnetic AC-mode) at the copolymer/air interface. Postpolymerization modification of the acrylic acid functions with perfluoro-octyl-iodide decreased the tendency towards spontaneous formation of nanopores. Crosslinking of individual polymer chains permitted the generation of ultraflat layers, which hosted the mycobacterial channel protein MspA, without compromising its channel function. The comparison of copolymers of very similar chemical composition that have been prepared by living radical polymerization and classic radical polymerization indicated that differences in polydispersity played only a minor role when poly-N-isopropyl-acrylamide/acrylic acid copolymers were spincast, but a major role when copolymers featuring the strongly hydrophobic perfluoro-octyl-labels were used. The mean pore diameters were 23.8+/-4.4 nm for P[(NIPAM)(95.5)-co-(AA)(4.5)] (PDI (polydispersity index)=1.55) and 21.8+/-4.2 nm for P[(NIPAM)(95.3)-co-(AA)(4.7)] (PDI=1.25). The depth of the nanopores was approx. 4 nm. When depositing P[(NIPAM)(95)-co-(AA)(2.8)-AAC(8)F(17 2.2)] (PDI=1.29) on Mica, the resulting mean pore diameter was 35.8+/-7.1 nm, with a depth of only 2 nm.
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Affiliation(s)
- Pubudu Gamage
- Kansas State University, Department of Chemistry and Terry C. Johnson Center for Basic Cancer Research, The Midwest Institute for Comparative Stem Cell Biology, 213 CBC Building, Manhattan, KS 66506-0401, USA,
| | - Matthew T. Basel
- Kansas State University, Department of Chemistry and Terry C. Johnson Center for Basic Cancer Research, The Midwest Institute for Comparative Stem Cell Biology, 213 CBC Building, Manhattan, KS 66506-0401, USA,
| | - Kimberly Lovell
- Kansas State University, Department of Chemistry and Terry C. Johnson Center for Basic Cancer Research, The Midwest Institute for Comparative Stem Cell Biology, 213 CBC Building, Manhattan, KS 66506-0401, USA,
| | - Megh Raj Pokhrel
- Central Department of Chemistry, Tribhuvan-University, Kathmandu, Nepal,
| | - Deletria Battle
- Kansas State University, Department of Chemistry and Terry C. Johnson Center for Basic Cancer Research, The Midwest Institute for Comparative Stem Cell Biology, 213 CBC Building, Manhattan, KS 66506-0401, USA,
- Kansas State University, Department of Chemistry, 213 CBC Building, Manhattan, KS 66506-0401, USA,
| | - Takashi Ito
- Kansas State University, Department of Chemistry, 213 CBC Building, Manhattan, KS 66506-0401, USA,
| | - Mikhail Pavlenok
- Department of Microbiology, University of Alabama at Birmingham, BBRB 609, AL 35294-2170, USA,
| | - Michael Niederweis
- Department of Microbiology, University of Alabama at Birmingham, BBRB 609, AL 35294-2170, USA,
| | - Stefan H. Bossmann
- Kansas State University, Department of Chemistry and Terry C. Johnson Center for Basic Cancer Research, The Midwest Institute for Comparative Stem Cell Biology, 213 CBC Building, Manhattan, KS 66506-0401, USA,
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677
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Xu B, Yuan J, Ding T, Gao Q. Amphiphilic biodegradable poly(ε-caprolactone)-poly(ethylene glycol)-poly(ε-caprolactone) triblock copolymers: synthesis, characterization and their use as drug carriers for folic acid. Polym Bull (Berl) 2009. [DOI: 10.1007/s00289-009-0157-5] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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678
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A Mathematical Model of Drug Release from Liposomes by Low Frequency Ultrasound. Ann Biomed Eng 2009; 37:2640-5. [DOI: 10.1007/s10439-009-9785-z] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2009] [Accepted: 08/19/2009] [Indexed: 11/26/2022]
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679
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Tang X, Liang X, Yang Q, Fan X, Shen Z, Zhou Q. AB2-type amphiphilic block copolymers composed of poly(ethylene glycol) and poly(N-isopropylacrylamide) via single-electron transfer living radical polymerization: Synthesis and characterization. ACTA ACUST UNITED AC 2009. [DOI: 10.1002/pola.23495] [Citation(s) in RCA: 70] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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680
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Wei H, Cheng SX, Zhang XZ, Zhuo RX. Thermo-sensitive polymeric micelles based on poly(N-isopropylacrylamide) as drug carriers. Prog Polym Sci 2009. [DOI: 10.1016/j.progpolymsci.2009.05.002] [Citation(s) in RCA: 586] [Impact Index Per Article: 39.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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681
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Bencherif SA, Washburn NR, Matyjaszewski K. Synthesis by AGET ATRP of Degradable Nanogel Precursors for In Situ Formation of Nanostructured Hyaluronic Acid Hydrogel. Biomacromolecules 2009; 10:2499-507. [DOI: 10.1021/bm9004639] [Citation(s) in RCA: 88] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Sidi A. Bencherif
- Department of Chemistry and Department of Biomedical Engineering, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213
| | - Newell R. Washburn
- Department of Chemistry and Department of Biomedical Engineering, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213
| | - Krzysztof Matyjaszewski
- Department of Chemistry and Department of Biomedical Engineering, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213
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682
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Siegwart DJ, Srinivasan A, Bencherif SA, Karunanidhi A, Oh JK, Vaidya S, Jin R, Hollinger JO, Matyjaszewski K. Cellular uptake of functional nanogels prepared by inverse miniemulsion ATRP with encapsulated proteins, carbohydrates, and gold nanoparticles. Biomacromolecules 2009; 10:2300-9. [PMID: 19572639 PMCID: PMC5305297 DOI: 10.1021/bm9004904] [Citation(s) in RCA: 80] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Atom transfer radical polymerization (ATRP) was used to produce a versatile drug delivery system capable of encapsulating a range of molecules. Inverse miniemulsion ATRP permitted the synthesis of biocompatible and uniformly cross-linked poly(ethylene oxide)-based nanogels entrapping gold nanoparticles, bovine serum albumin, rhodamine B isothiocyanate-dextran, or fluoresceine isothiocyanate-dextran. These moieties were entrapped to validate several biological outcomes and to model delivery of range of molecules. Cellular uptake of nanogels was verified by transmission electron microscopy, gel electrophoresis, Western blotting, confocal microscopy, and flow cytometry. Fluorescent colocalization of nanogels with a fluorophore-conjugated antibody for clathrin indicated clathrin-mediated endocytosis. Furthermore, internalization of nanogels either with or without GRGDS cell attachment-mediating peptides was quantified using flow cytometry. After 45 min of incubation, the uptake of unmodified FITC-Dx-loaded nanogels was 62%, whereas cellular uptake increased to >95% with the same concentration of GRGDS-modified FITC-Dx nanogels. In addition, a spheroidal coculture of human umbilical vascular endothelial cells (HUVECs) and human mesenchymal stem cells (hMSCs) validated cell endocytosis. Application of ATRP enabled the synthesis of a functionalized drug delivery system with a uniform network that is capable of encapsulating and delivering inorganic, organic, and biological molecules.
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Affiliation(s)
- Daniel J. Siegwart
- Department of Chemistry, Carnegie Mellon University, 4400 Fifth Avenue, Pittsburgh, PA 15213
| | - Abiraman Srinivasan
- Bone Tissue Engineering Center, Carnegie Mellon University, 5000 Forbes Avenue, Pittsburgh, PA 15213
| | - Sidi A. Bencherif
- Department of Chemistry, Carnegie Mellon University, 4400 Fifth Avenue, Pittsburgh, PA 15213
| | - Anuradha Karunanidhi
- Bone Tissue Engineering Center, Carnegie Mellon University, 5000 Forbes Avenue, Pittsburgh, PA 15213
| | - Jung Kwon Oh
- Department of Chemistry, Carnegie Mellon University, 4400 Fifth Avenue, Pittsburgh, PA 15213
| | - Swaroopa Vaidya
- Bone Tissue Engineering Center, Carnegie Mellon University, 5000 Forbes Avenue, Pittsburgh, PA 15213
| | - Rongchao Jin
- Department of Chemistry, Carnegie Mellon University, 4400 Fifth Avenue, Pittsburgh, PA 15213
| | - Jeffrey O. Hollinger
- Bone Tissue Engineering Center, Carnegie Mellon University, 5000 Forbes Avenue, Pittsburgh, PA 15213
| | - Krzysztof Matyjaszewski
- Department of Chemistry, Carnegie Mellon University, 4400 Fifth Avenue, Pittsburgh, PA 15213
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683
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684
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Qu T, Wang A, Yuan J, Gao Q. Preparation of an amphiphilic triblock copolymer with pH- and thermo-responsiveness and self-assembled micelles applied to drug release. J Colloid Interface Sci 2009; 336:865-71. [DOI: 10.1016/j.jcis.2009.04.001] [Citation(s) in RCA: 54] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2008] [Revised: 04/01/2009] [Accepted: 04/01/2009] [Indexed: 11/16/2022]
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685
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Li G, Guo L, Ma S. Self-assembly and drug delivery behaviors of thermo-sensitive poly(t-butyl acrylate)-b-poly(N-isopropylacrylamide) micelles. J Appl Polym Sci 2009. [DOI: 10.1002/app.30033] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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686
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Li F, Wu H, Fan L, Zhang H, Zhang H, Gu C. Study of dual responsive poly[(maleilated dextran)-graft
-(N
-isopropylacrylamide)] hydrogel nanoparticles: preparation, characterization and biological evaluation. POLYM INT 2009. [DOI: 10.1002/pi.2627] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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687
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Ultrasound triggered release of cisplatin from liposomes in murine tumors. J Control Release 2009; 137:63-8. [DOI: 10.1016/j.jconrel.2009.03.007] [Citation(s) in RCA: 243] [Impact Index Per Article: 16.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2008] [Revised: 03/02/2009] [Accepted: 03/03/2009] [Indexed: 11/17/2022]
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688
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Abstract
Drug delivery systems (DDS) capable of releasing an active molecule at the appropriate site and at a rate that adjusts in response to the progression of the disease or to certain functions/biorhythms of the organism are particularly appealing. Biocompatible materials sensitive to certain physiological variables or external physicochemical stimuli (intelligent materials) can be used for achieving this aim. Light-responsiveness is receiving increasing attention owing to the possibility of developing materials sensitive to innocuous electromagnetic radiation (mainly in the UV, visible and near-infrared range), which can be applied on demand at well delimited sites of the body. Some light-responsive DDS are of a single use (i.e. the light triggers an irreversible structural change that provokes the delivery of the entire dose) while others able to undergo reversible structural changes when cycles of light/dark are applied, behave as multi-switchable carriers (releasing the drug in a pulsatile manner). In this review, the mechanisms used to develop polymeric micelles, gels, liposomes and nanocomposites with light-sensitiveness are analyzed. Examples of the capability of some polymeric, lipidic and inorganic structures to regulate the release of small solutes and biomacromolecules are presented and the potential of light-sensitive carriers as functional components of intelligent DDS is discussed.
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Affiliation(s)
- Carmen Alvarez-Lorenzo
- Departamento de Farmacia y Tecnología Farmacéutica, Facultad de Farmacia, Universidad de Santiago de Compostela, Santiago de Compostela, Spain.
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689
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Madsen J, Armes SP, Bertal K, MacNeil S, Lewis AL. Preparation and Aqueous Solution Properties of Thermoresponsive Biocompatible AB Diblock Copolymers. Biomacromolecules 2009; 10:1875-87. [DOI: 10.1021/bm9002915] [Citation(s) in RCA: 53] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
| | | | | | | | - Andrew L. Lewis
- Biocompatibles UK Ltd., Chapman House, Farnham Business Park, Weydon Lane, Farnham, Surrey, GU9 8QL, United Kingdom
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690
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Fu J, Kim DH, Knoll W. Aqueous Networks and Toroids of Amphiphilic Block Copolymer with Non-ionic Surfactants. Chemphyschem 2009; 10:1190-4. [DOI: 10.1002/cphc.200900081] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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691
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Castillo R, Müller A. Crystallization and morphology of biodegradable or biostable single and double crystalline block copolymers. Prog Polym Sci 2009. [DOI: 10.1016/j.progpolymsci.2009.03.002] [Citation(s) in RCA: 174] [Impact Index Per Article: 11.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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692
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Rapoport NY, Kennedy AM, Shea JE, Scaife CL, Nam KH. Controlled and targeted tumor chemotherapy by ultrasound-activated nanoemulsions/microbubbles. J Control Release 2009; 138:268-76. [PMID: 19477208 DOI: 10.1016/j.jconrel.2009.05.026] [Citation(s) in RCA: 399] [Impact Index Per Article: 26.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2009] [Revised: 04/30/2009] [Accepted: 05/20/2009] [Indexed: 10/20/2022]
Abstract
The paper reports the results of nanotherapy of ovarian, breast, and pancreatic cancerous tumors by paclitaxel-loaded nanoemulsions that convert into microbubbles locally in tumor tissue under the action of tumor-directed therapeutic ultrasound. Tumor accumulation of nanoemulsions was confirmed by ultrasound imaging. Dramatic regression of ovarian, breast, and orthotopic pancreatic tumors was observed in tumor therapy through systemic injections of drug-loaded nanoemulsions combined with therapeutic ultrasound, signifying efficient ultrasound-triggered drug release from tumor-accumulated nanodroplets. The mechanism of drug release in the process of droplet-to-bubble conversion is discussed. No therapeutic effect from the nanodroplet/ultrasound combination was observed without the drug, indicating that therapeutic effect was caused by the ultrasound-enhanced chemotherapeutic action of the tumor-targeted drug, rather than the mechanical or thermal action of ultrasound itself. Tumor recurrence was observed after the completion of the first treatment round; a second treatment round with the same regimen proved less effective, suggesting that drug-resistant cells were either developed or selected during the first treatment round.
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Affiliation(s)
- Natalya Y Rapoport
- Department of Bioengineering, University of Utah, Salt Lake City, UT 84112, USA.
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693
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Mishra B, Patel BB, Tiwari S. Colloidal nanocarriers: a review on formulation technology, types and applications toward targeted drug delivery. NANOMEDICINE-NANOTECHNOLOGY BIOLOGY AND MEDICINE 2009; 6:9-24. [PMID: 19447208 DOI: 10.1016/j.nano.2009.04.008] [Citation(s) in RCA: 364] [Impact Index Per Article: 24.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/12/2009] [Revised: 04/13/2009] [Accepted: 04/28/2009] [Indexed: 10/20/2022]
Abstract
UNLABELLED Colloidal nanocarriers, in their various forms, have the possibility of providing endless opportunities in the area of drug delivery. The current communication embodies an in-depth discussion of colloidal nanocarriers with respect to formulation aspects, types, and site-specific drug targeting using various forms of colloidal nanocarriers with special insights to the field of oncology. Specialized nanotechnological approaches like quantum dots, dendrimers, integrins, monoclonal antibodies, and so forth, which have been extensively researched for targeted delivery of therapeutic and diagnostic agents, are also discussed. Nanotechnological patents, issued by the U.S. Patent and Trademark Office in the area of drug delivery, are also included in this review to emphasize the importance of nanotechnology in the current research scenario. FROM THE CLINICAL EDITOR Colloidal nanocarriers provide almost endless opportunities in the area of drug delivery. While the review mainly addresses potential oncological applications, similar approaches may be applicable in other conditions with a requirement for targeted drug delivery. Technologies including quantum dots, dendrimers, integrins, monoclonal antibodies are discussed, along with US-based patents related to these methods.
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Affiliation(s)
- B Mishra
- Department of Pharmaceutics, Institute of Technology, Banaras Hindu University, Varanasi, India.
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694
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He E, Yue CY, Tam KC. Association behavior of star-shaped pH-responsive block copolymer: four-arm poly(ethylene oxide)-b-poly(methacrylic acid) in aqueous medium. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2009; 25:4892-4899. [PMID: 19290652 DOI: 10.1021/la804056p] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
A four arm pH-responsive poly(ethylene oxide)-b-poly(methacrylic acid) block copolymer was synthesized by atom transfer radical polymerization technique. The conformation transition over the course of neutralization was investigated using a combination of potentiometric and conductometric titrations, dynamic and static light scattering, and transmission electron microscopy. The multiarm block copolymer existed as an extended unimer at high pH due to the negatively charged carboxylate groups and hydrophilic poly(ethylene oxide) segments. The block copolymers self-assembled into core-shell micelles and large spherical aggregates that flocculated at low degree of neutralization (alpha). Such behavior is controlled by the fine balance of electrostatic, hydrophobic, and hydrogen bond interactions. The hydrodynamic radius (R(h)) of the aggregates was approximately 84 nm at alpha of 0.3, and it decreased to 63 and 46 nm at alpha approximately 0.2 and 0.1, respectively, as a result of the reduced electrostatic interaction between ionized carboxylate groups. The thermodynamic parameters obtained from isothermal titration calorimetric technique in different salt concentrations indicated that the energy to extract a proton from a charged polyion was reduced by the addition of salt, which favors the neutralization process.
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Affiliation(s)
- E He
- School of Mechanical and Aerospace Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798
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695
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Suppression of in vivo tumor growth by using a biodegradable thermosensitive hydrogel polymer containing chemotherapeutic agent. Invest New Drugs 2009; 28:284-90. [PMID: 19387556 DOI: 10.1007/s10637-009-9253-5] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2009] [Accepted: 03/31/2009] [Indexed: 10/20/2022]
Abstract
Current systemic chemotherapy in the treatment of solid tumors inevitably induces various systemic adverse effects. Locally injected chemotherapy is expected to overcome this limitation of systemic therapy. We evaluated by luminescence imaging the effects of chemotherapy administered locally by means of a biodegradable thermosensitive hydrogel polymer. The human gastric cancer cell line HSC44Luc was used for tumor induction, and it was confirmed to be sensitive to doxorubicin by MTT assay. Cells were injected subcutaneously into Balb/c-nude mice. When the mean volume of tumor reached 400 mm(3), we divided the mice into 6 groups (5 per group) according to treatment: 1) control (intratumor injection of PBS), 2) systemic injection of doxorubicin, 3) intratumor injection of polymer gel, 4) intratumor injection of polymer gel physically mixed with a low dose of doxorubicin, 5) intratumor injection of polymer gel physically mixed with a high dose of doxorubicin, 6) intratumor injection of conjugated polymer gel with doxorubicin. Body weight and tumor volume were measured every 2 or 3 days for 30 days after treatment. One mouse in each group was sacrificed for histopathologic examination every week. Reductions in body weight were not significantly different among groups. The relative rate of tumor growth was 774% in Group 1, 267% in Group 2, 813% in Group 3, -186% in Group 4, and 155% in Group 6, respectively. Thus the relative rate of tumor growth in the groups treated with polymer gel mixed with doxorubicin and the groups treated with conjugated polymer gel with doxorubicin were lower than that in the control group. Locally injectable chemotherapy using a thermosensitive hydrogel polymer with doxorubicin can suppress tumor growth effectively without severe systemic toxicity.
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696
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Meng F, Zhong Z, Feijen J. Stimuli-responsive polymersomes for programmed drug delivery. Biomacromolecules 2009; 10:197-209. [PMID: 19123775 DOI: 10.1021/bm801127d] [Citation(s) in RCA: 851] [Impact Index Per Article: 56.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
In the past decade, polymersomes (also referred to as polymeric vesicles) have attracted rapidly growing interest based on their intriguing aggregation phenomena, cell and virus-mimicking dimensions and functions, as well as tremendous potential applications in medicine, pharmacy, and biotechnology. Unlike liposomes self-assembled from low molecular weight lipids, polymersomes are in general prepared from macromolecular amphiphiles of various architectures including amphiphilic diblock, triblock, graft and dendritic copolymers. Polymersomes exhibit very unique features highlighted with high stability, tunable membrane properties, versatility, and capacity of transporting hydrophilic as well as hydrophobic species such as anticancer drugs, genes, proteins, and diagnostic probes. Recently, much effort has been directed to the development of intelligent polymersomes that respond to internal or external stimuli, in particular, pH, temperature, redox potential, light, magnetic field, and ultrasound, either reversibly or nonreversibly. Stimuli-sensitive polymersomes have emerged as novel programmable delivery systems in which the release of the encapsulated contents can be readily modulated by the stimulus. The stimuli-responsive release may result in significantly enhanced therapeutic efficacy and minimized possible side effects. It is also feasible to form and disassemble polymersomes in water simply by applying an appropriate stimulus. In this article, recent advances in stimuli-sensitive polymersomes have been reviewed, and perspectives on future developments have been discussed.
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Affiliation(s)
- Fenghua Meng
- Biomedical Polymers Laboratory, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou, 215123, People's Republic of China
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697
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Klaikherd A, Nagamani C, Thayumanavan S. Multi-stimuli sensitive amphiphilic block copolymer assemblies. J Am Chem Soc 2009; 131:4830-8. [PMID: 19290632 PMCID: PMC2693022 DOI: 10.1021/ja809475a] [Citation(s) in RCA: 471] [Impact Index Per Article: 31.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Stimuli-responsive polymers are arguably the most widely considered systems for a variety of applications in biomedical arena. We report here a novel triple stimuli sensitive block copolymer assembly that responds to changes in temperature, pH and redox potential. Our block copolymer design constitutes an acid-sensitive THP-protected HEMA as the hydrophobic part and a temperature-sensitive PNIPAM as the hydrophilic part with an intervening disulfide bond. The micellar properties and the release kinetics of the encapsulated guest molecule in response to one stimulus as well as combinations of stimuli have been evaluated. Responsiveness to combination of stimuli not only allows for fine-tuning the guest molecule release kinetics, but also provides the possibility of achieving location-specific delivery.
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Affiliation(s)
- Akamol Klaikherd
- Department of Chemistry, University of Massachusetts, Amherst, MA 01003
| | | | - S. Thayumanavan
- Department of Chemistry, University of Massachusetts, Amherst, MA 01003
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698
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Qu T, Wang A, Yuan J, Shi J, Gao Q. Preparation and characterization of thermo-responsive amphiphilic triblock copolymer and its self-assembled micelle for controlled drug release. Colloids Surf B Biointerfaces 2009; 72:94-100. [PMID: 19394207 DOI: 10.1016/j.colsurfb.2009.03.020] [Citation(s) in RCA: 49] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2008] [Revised: 03/24/2009] [Accepted: 03/24/2009] [Indexed: 10/20/2022]
Abstract
An amphiphilic thermo-responsive ABA triblock copolymer, poly(methyl methacrylate)-b-poly(N-isopropylacrylamide-co-poly(ethylene-glycol) methyl ether methacrlate)-b-poly(methyl methacrylate) (PMMA-b-P(NIPAM-co-PEGMEMA)-b-PMMA), was designed and synthesized via reversible addition fragmentation chain transfer (RAFT) polymerization, and subsequently characterized by FT-IR, (1)H NMR and GPC. The copolymer can disperse in water and self-assemble into nanoscaled micelles in a "flower-like" arrangement at room temperature; the hydrophobic PMMA tucks in the core while the hydrophilic and improved biocompatible P(NIPAM-co-PEGMEMA) forms a thermosensitive outer shell. The resulting micelles were investigated using fluorescence spectroscopy, dynamic light scattering technique (DLS) and transmission electron microscopy (TEM). The copolymer exhibited a lower critical solution temperature (LCST) of around 39 degrees C via optical transmittance measurements. Notably, there was no copolymer precipitation observed at the LCST, which was propitious to in vivo use of the micelle. The micelles loaded with folic acid as a model drug showed a desired thermo-responsive drug release behavior. It was found that the rate and amount (maximum percentage 85%) of the drug release was much higher above the LCST than that (maximum percentage 36%) below the LCST. These results indicate that the thermosensitive triblock copolymer possesses promising potential applications as a "smart" drug carrier in biomedical science.
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Affiliation(s)
- Tianhong Qu
- Institute of Fine Chemical and Engineering, Henan University, Kaifeng, Henan, People's Republic of China
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699
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Chu H, Liu N, Wang X, Jiao Z, Chen Z. Morphology and in vitro release kinetics of drug-loaded micelles based on well-defined PMPC–b–PBMA copolymer. Int J Pharm 2009; 371:190-6. [DOI: 10.1016/j.ijpharm.2008.12.033] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2008] [Revised: 12/10/2008] [Accepted: 12/21/2008] [Indexed: 10/21/2022]
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700
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Wang YC, Li Y, Yang XZ, Yuan YY, Yan LF, Wang J. Tunable Thermosensitivity of Biodegradable Polymer Micelles of Poly(ε-caprolactone) and Polyphosphoester Block Copolymers. Macromolecules 2009. [DOI: 10.1021/ma900288t] [Citation(s) in RCA: 95] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Yu-Cai Wang
- Departments of Polymer Science and Engineering and Chemical Physics, Hefei National Laboratory for Physical Sciences at Microscale, and School of Life Sciences, University of Science and Technology of China, Hefei, Anhui 230027, People’s Republic of China
| | - Yang Li
- Departments of Polymer Science and Engineering and Chemical Physics, Hefei National Laboratory for Physical Sciences at Microscale, and School of Life Sciences, University of Science and Technology of China, Hefei, Anhui 230027, People’s Republic of China
| | - Xian-Zhu Yang
- Departments of Polymer Science and Engineering and Chemical Physics, Hefei National Laboratory for Physical Sciences at Microscale, and School of Life Sciences, University of Science and Technology of China, Hefei, Anhui 230027, People’s Republic of China
| | - You-Yong Yuan
- Departments of Polymer Science and Engineering and Chemical Physics, Hefei National Laboratory for Physical Sciences at Microscale, and School of Life Sciences, University of Science and Technology of China, Hefei, Anhui 230027, People’s Republic of China
| | - Li-Feng Yan
- Departments of Polymer Science and Engineering and Chemical Physics, Hefei National Laboratory for Physical Sciences at Microscale, and School of Life Sciences, University of Science and Technology of China, Hefei, Anhui 230027, People’s Republic of China
| | - Jun Wang
- Departments of Polymer Science and Engineering and Chemical Physics, Hefei National Laboratory for Physical Sciences at Microscale, and School of Life Sciences, University of Science and Technology of China, Hefei, Anhui 230027, People’s Republic of China
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