301
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Li YL, Zhu L, Liu Z, Cheng R, Meng F, Cui JH, Ji SJ, Zhong Z. Reversibly Stabilized Multifunctional Dextran Nanoparticles Efficiently Deliver Doxorubicin into the Nuclei of Cancer Cells. Angew Chem Int Ed Engl 2009; 48:9914-8. [DOI: 10.1002/anie.200904260] [Citation(s) in RCA: 395] [Impact Index Per Article: 26.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
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302
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Climent E, Bernardos A, Martínez-Máñez R, Maquieira A, Marcos MD, Pastor-Navarro N, Puchades R, Sancenón F, Soto J, Amorós P. Controlled delivery systems using antibody-capped mesoporous nanocontainers. J Am Chem Soc 2009; 131:14075-80. [PMID: 19739626 DOI: 10.1021/ja904456d] [Citation(s) in RCA: 185] [Impact Index Per Article: 12.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
This paper describes the design of new controlled delivery systems consisting of a mesoporous support functionalized on the pore outlets with a certain hapten able to interact with an antibody that acts as a nanoscopic cap. The opening protocol and delivery of the entrapped guest is related by a displacement reaction involving the presence in the solution of the antigen to which the antibody is selective. As a proof-of-the-concept, the solid MCM-41 was selected as support and was loaded with the dye [Ru(bipy)(3)]Cl(2). Then a suitable derivative of the hapten 4-(4-aminobenzenesulfonylamino)benzoic acid was anchored on the outer surface of the mesoporous support (solid S1). Finally the pores were capped with a polyclonal antibody for sulfathiazole (solid S1-AB). Delivery of the dye in the presence of a family of sulfonamides was studied in phosphate-buffered saline (PBS; pH 7.5). A selective uncapping of the pores and dye delivery was observed for sulfathiazole. This delivery behavior was compared with that shown by other solids that were prepared as models to assess the effect of the hapten and its interaction with antibody in the dye delivery control in the presence of the antigen.
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Affiliation(s)
- Estela Climent
- Instituto de Reconocimiento Molecular y Desarrollo Tecnológico, Centro Mixto Universidad Politécnica de Valencia-Universidad de Valencia, Valencia, Spain
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303
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Li YL, Zhu L, Liu Z, Cheng R, Meng F, Cui JH, Ji SJ, Zhong Z. Reversibly Stabilized Multifunctional Dextran Nanoparticles Efficiently Deliver Doxorubicin into the Nuclei of Cancer Cells. Angew Chem Int Ed Engl 2009. [DOI: 10.1002/ange.200904260] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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304
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Jiang G. pH-responsive poly(2-ethylacrylic acid-co-alkyl methacrylate) copolymers as biomembrane switches. J Appl Polym Sci 2009. [DOI: 10.1002/app.30784] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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305
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Azagarsamy MA, Sokkalingam P, Thayumanavan S. Enzyme-triggered disassembly of dendrimer-based amphiphilic nanocontainers. J Am Chem Soc 2009; 131:14184-5. [PMID: 19757790 DOI: 10.1021/ja906162u] [Citation(s) in RCA: 146] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
We demonstrate a new enzyme-induced disassembly of amphiphilic nanocontainers based on dendrimers. Disassembly and the ensuing release of noncovalently bound guest molecules are of great interest because of their implications in areas such as drug delivery and sensing. Achieving these with a protein as the stimulus is of even greater importance, because proteins are the primary indicators of biological imbalances. We achieved disassembly of the nanocontainers by disturbing the hydrophilic-lipophilic balance in the amphiphilic dendrimer building blocks.
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Affiliation(s)
- Malar A Azagarsamy
- Department of Chemistry, University of Massachusetts, Amherst, Massachusetts 01003, USA
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306
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Xu Y, Meng F, Cheng R, Zhong Z. Reduction-Sensitive Reversibly Crosslinked Biodegradable Micelles for Triggered Release of Doxorubicin. Macromol Biosci 2009; 9:1254-61. [DOI: 10.1002/mabi.200900233] [Citation(s) in RCA: 88] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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307
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Iha RK, Wooley KL, Nyström AM, Burke DJ, Kade MJ, Hawker CJ. Applications of orthogonal "click" chemistries in the synthesis of functional soft materials. Chem Rev 2009; 109:5620-86. [PMID: 19905010 PMCID: PMC3165017 DOI: 10.1021/cr900138t] [Citation(s) in RCA: 1174] [Impact Index Per Article: 78.3] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Affiliation(s)
- Rhiannon K. Iha
- Department of Chemistry, Department of Radiology, Washington University in Saint Louis, Saint Louis, Missouri 63130, USA
| | - Karen L. Wooley
- Department of Chemistry, Department of Radiology, Washington University in Saint Louis, Saint Louis, Missouri 63130, USA
- Department of Chemistry, Texas A&M University, College Station, Texas 77842
| | - Andreas M. Nyström
- Cancer Center Karolinska, Department of Oncology-Pathology CCK, R8:03 Karolinska Hospital and Institute, SE-171 76 Stockholm, Sweden
| | - Daniel J. Burke
- Department of Chemistry and Biochemistry, Department of Materials, and Materials Research Laboratory, University of California, Santa Barbara, California 93106, USA
| | - Matthew J. Kade
- Department of Chemistry and Biochemistry, Department of Materials, and Materials Research Laboratory, University of California, Santa Barbara, California 93106, USA
| | - Craig J. Hawker
- Department of Chemistry and Biochemistry, Department of Materials, and Materials Research Laboratory, University of California, Santa Barbara, California 93106, USA
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308
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Nagano A, Kikuchi Y, Sato H, Nakazawa Y, Asakura T. Structural Characterization of Silk-Based Water-Soluble Peptides (Glu)n(Ala-Gly-Ser-Gly-Ala-Gly)4 (n = 4−8) as a Mimic of Bombyx mori Silk Fibroin by 13C Solid-State NMR. Macromolecules 2009. [DOI: 10.1021/ma901949x] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Affiliation(s)
- Aya Nagano
- Department of Biotechnology, Tokyo University of Agriculture, Technology, Koganei, Tokyo, 184-8588, Japan
- Research Department, Japan Medical Materials Corporation, Osaka 532-0003, Japan
| | - Yuka Kikuchi
- Department of Biotechnology, Tokyo University of Agriculture, Technology, Koganei, Tokyo, 184-8588, Japan
| | - Hirohiko Sato
- Department of Biotechnology, Tokyo University of Agriculture, Technology, Koganei, Tokyo, 184-8588, Japan
- Analysis Research Department, Chemical Laboratories, Nissan Chemical Industries Ltd., Funabashi, Chiba 274-8507, Japan
| | - Yasumoto Nakazawa
- Nature and Science Museum, Tokyo University of Agriculture and Technology, Koganei, Tokyo 184-8588, Japan
| | - Tetsuo Asakura
- Department of Biotechnology, Tokyo University of Agriculture, Technology, Koganei, Tokyo, 184-8588, Japan
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309
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Schumers J, Fustin C, Can A, Hoogenboom R, Schubert US, Gohy J. Are
o
‐nitrobenzyl (meth)acrylate monomers polymerizable by controlled‐radical polymerization? ACTA ACUST UNITED AC 2009. [DOI: 10.1002/pola.23693] [Citation(s) in RCA: 49] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Jean‐Marc Schumers
- Unité de Chimie des Matériaux Inorganiques et Organiques (CMAT), Université Catholique de Louvain, Place L. Pasteur 1, B‐1348 Louvain‐la‐Neuve, Belgium
| | - Charles‐André Fustin
- Unité de Chimie des Matériaux Inorganiques et Organiques (CMAT), Université Catholique de Louvain, Place L. Pasteur 1, B‐1348 Louvain‐la‐Neuve, Belgium
| | - Aydin Can
- Laboratory of Macromolecular Chemistry and Nanoscience, Eindhoven University of Technology, P.O. Box 513, 5600 MB Eindhoven, The Netherlands
- Laboratory of Organic and Macromolecular Chemistry, Friedrich‐Schiller‐University Jena, Humboldtstr. 10, 07743 Jena, Germany
| | - Richard Hoogenboom
- Laboratory of Macromolecular Chemistry and Nanoscience, Eindhoven University of Technology, P.O. Box 513, 5600 MB Eindhoven, The Netherlands
| | - Ulrich S. Schubert
- Laboratory of Macromolecular Chemistry and Nanoscience, Eindhoven University of Technology, P.O. Box 513, 5600 MB Eindhoven, The Netherlands
- Laboratory of Organic and Macromolecular Chemistry, Friedrich‐Schiller‐University Jena, Humboldtstr. 10, 07743 Jena, Germany
| | - Jean‐François Gohy
- Unité de Chimie des Matériaux Inorganiques et Organiques (CMAT), Université Catholique de Louvain, Place L. Pasteur 1, B‐1348 Louvain‐la‐Neuve, Belgium
- Laboratory of Macromolecular Chemistry and Nanoscience, Eindhoven University of Technology, P.O. Box 513, 5600 MB Eindhoven, The Netherlands
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310
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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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311
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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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312
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Burakowska E, Zimmerman SC, Haag R. Photoresponsive crosslinked hyperbranched polyglycerols as smart nanocarriers for guest binding and controlled release. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2009; 5:2199-2204. [PMID: 19572327 DOI: 10.1002/smll.200900465] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
A convenient methodology for the synthesis of photolabile crosslinked hyperbranched polyglycerol nanocapsules is presented. These nanocarriers selectively and efficiently bind ionic guest molecules. The stability of the host-guest complexes formed depends on the counterion of the guest molecules. Moreover, the control over guest binding can be achieved by modification of the polymer building blocks, in particular the outer shell. In addition, photo-triggered degradation of the nanocarrier leads to efficient release of encapsulated guest molecules. This approach, using photolabile dendritic nanocarriers to bind and release guest molecules, is of particular relevance for biomedical applications where selective guest binding and controlled release are crucial.
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Affiliation(s)
- Ewelina Burakowska
- Department of Biology, Chemistry, and Pharmacy, Freie Universität Berlin, Takustrasse 3, 14195 Berlin, Germany
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313
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Kita-Tokarczyk K, Itel F, Grzelakowski M, Egli S, Rossbach P, Meier W. Monolayer interactions between lipids and amphiphilic block copolymers. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2009; 25:9847-9856. [PMID: 19705885 DOI: 10.1021/la900948a] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
Interactions in binary mixed monolayers from lipids 1,2-dipalmitoyl-sn-glycero-3-phosphocholine (DPPC) and 1,2-dioleoyl-sn-glycero-3-phosphocholine (DOPC) and amphiphilic poly(2-methyloxazoline)-block-poly(dimethylsiloxane)-block-poly(2-methyloxazoline) block copolymers were studied by using the Langmuir balance technique and Brewster angle microscopy. It is shown that monolayers from the saturated lipid (DPPC) are more sensitive to the presence of polymers in the film, resulting in phase separation and the formation of pure lipid domains at high surface pressure. The morphology and composition of such phase-separated lipid-polymer films were studied by fluorescence microscopy and ToF-SIMS. In contrast, in DOPC-containing monolayers, the polymers tend to phase-separate at low surface pressures only and homogeneous films are obtained upon further compression, due to higher lipid fluidity. The analysis of excess energy of mixing shows that while the separation effect in densely packed DPPC-containing films is strongly dependent on the polymer size (with the larger polymer having a much stronger influence), in the case of monolayers with DOPC much smaller effects are observed. The results are discussed in terms of the monolayer composition, lipid fluidity, and polymer size.
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314
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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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315
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Bar J, Herbst RS, Onn A. Targeted drug delivery strategies to treat lung metastasis. Expert Opin Drug Deliv 2009; 6:1003-16. [PMID: 19663628 DOI: 10.1517/17425240903167926] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
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316
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van Dongen SFM, de Hoog HPM, Peters RJRW, Nallani M, Nolte RJM, van Hest JCM. Biohybrid Polymer Capsules. Chem Rev 2009; 109:6212-74. [DOI: 10.1021/cr900072y] [Citation(s) in RCA: 357] [Impact Index Per Article: 23.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Affiliation(s)
- Stijn F. M. van Dongen
- Department of Organic Chemistry, Institute for Molecules and Materials, Radboud University Nijmegen, Heyendaalseweg 135, 6525AJ Nijmegen, The Netherlands, and Institute of Materials Research & Engineering (IMRE), Research Link 3, Singapore 117602, Singapore
| | - Hans-Peter M. de Hoog
- Department of Organic Chemistry, Institute for Molecules and Materials, Radboud University Nijmegen, Heyendaalseweg 135, 6525AJ Nijmegen, The Netherlands, and Institute of Materials Research & Engineering (IMRE), Research Link 3, Singapore 117602, Singapore
| | - Ruud J. R. W. Peters
- Department of Organic Chemistry, Institute for Molecules and Materials, Radboud University Nijmegen, Heyendaalseweg 135, 6525AJ Nijmegen, The Netherlands, and Institute of Materials Research & Engineering (IMRE), Research Link 3, Singapore 117602, Singapore
| | - Madhavan Nallani
- Department of Organic Chemistry, Institute for Molecules and Materials, Radboud University Nijmegen, Heyendaalseweg 135, 6525AJ Nijmegen, The Netherlands, and Institute of Materials Research & Engineering (IMRE), Research Link 3, Singapore 117602, Singapore
| | - Roeland J. M. Nolte
- Department of Organic Chemistry, Institute for Molecules and Materials, Radboud University Nijmegen, Heyendaalseweg 135, 6525AJ Nijmegen, The Netherlands, and Institute of Materials Research & Engineering (IMRE), Research Link 3, Singapore 117602, Singapore
| | - Jan C. M. van Hest
- Department of Organic Chemistry, Institute for Molecules and Materials, Radboud University Nijmegen, Heyendaalseweg 135, 6525AJ Nijmegen, The Netherlands, and Institute of Materials Research & Engineering (IMRE), Research Link 3, Singapore 117602, Singapore
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317
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O'Lenick TG, Jiang X, Zhao B. Catalytic activity of a thermosensitive hydrophilic diblock copolymer-supported 4-N,N-dialkylaminopyridine in hydrolysis of p-nitrophenyl acetate in aqueous buffers. POLYMER 2009. [DOI: 10.1016/j.polymer.2009.07.007] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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318
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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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319
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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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320
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Wang L, Hu P, Tirelli N. Amphiphilic star block copolymers: Influence of branching on lyotropic/interfacial properties. POLYMER 2009. [DOI: 10.1016/j.polymer.2009.04.035] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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321
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Chen W, Meng F, Li F, Ji SJ, Zhong Z. pH-Responsive Biodegradable Micelles Based on Acid-Labile Polycarbonate Hydrophobe: Synthesis and Triggered Drug Release. Biomacromolecules 2009; 10:1727-35. [DOI: 10.1021/bm900074d] [Citation(s) in RCA: 199] [Impact Index Per Article: 13.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Wei Chen
- Biomedical Polymers Laboratory and Jiangsu Key Laboratory of Organic Chemistry, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, People’s Republic of China
| | - Fenghua Meng
- Biomedical Polymers Laboratory and Jiangsu Key Laboratory of Organic Chemistry, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, People’s Republic of China
| | - Feng Li
- Biomedical Polymers Laboratory and Jiangsu Key Laboratory of Organic Chemistry, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, People’s Republic of China
| | - Shun-Jun Ji
- Biomedical Polymers Laboratory and Jiangsu Key Laboratory of Organic Chemistry, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, People’s Republic of China
| | - Zhiyuan Zhong
- Biomedical Polymers Laboratory and Jiangsu Key Laboratory of Organic Chemistry, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, People’s Republic of China
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322
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Fong WK, Hanley T, Boyd BJ. Stimuli responsive liquid crystals provide ‘on-demand’ drug delivery in vitro and in vivo. J Control Release 2009; 135:218-26. [DOI: 10.1016/j.jconrel.2009.01.009] [Citation(s) in RCA: 242] [Impact Index Per Article: 16.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2008] [Revised: 12/22/2008] [Accepted: 01/17/2009] [Indexed: 11/24/2022]
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323
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Kojima C, Yoshimura K, Harada A, Sakanishi Y, Kono K. Synthesis and Characterization of Hyperbranched Poly(glycidol) Modified with pH- and Temperature-Sensitive Groups. Bioconjug Chem 2009; 20:1054-7. [DOI: 10.1021/bc900016x] [Citation(s) in RCA: 65] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Chie Kojima
- Department of Applied Chemistry, Graduate School of Engineering, Osaka Prefecture University, Osaka, Japan, and Daicel Chemical Industries, Ltd., Osaka, Japan
| | - Kohei Yoshimura
- Department of Applied Chemistry, Graduate School of Engineering, Osaka Prefecture University, Osaka, Japan, and Daicel Chemical Industries, Ltd., Osaka, Japan
| | - Atsushi Harada
- Department of Applied Chemistry, Graduate School of Engineering, Osaka Prefecture University, Osaka, Japan, and Daicel Chemical Industries, Ltd., Osaka, Japan
| | - Yuichi Sakanishi
- Department of Applied Chemistry, Graduate School of Engineering, Osaka Prefecture University, Osaka, Japan, and Daicel Chemical Industries, Ltd., Osaka, Japan
| | - Kenji Kono
- Department of Applied Chemistry, Graduate School of Engineering, Osaka Prefecture University, Osaka, Japan, and Daicel Chemical Industries, Ltd., Osaka, Japan
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324
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Babin J, Pelletier M, Lepage M, Allard JF, Morris D, Zhao Y. A New Two-Photon-Sensitive Block Copolymer Nanocarrier. Angew Chem Int Ed Engl 2009; 48:3329-32. [DOI: 10.1002/anie.200900255] [Citation(s) in RCA: 267] [Impact Index Per Article: 17.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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325
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Babin J, Pelletier M, Lepage M, Allard JF, Morris D, Zhao Y. A New Two-Photon-Sensitive Block Copolymer Nanocarrier. Angew Chem Int Ed Engl 2009. [DOI: 10.1002/ange.200900255] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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326
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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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327
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HUANG X, DU F, YANG J, LI Z. ACID SENSITIVE MICELLAR AGGREGATES BASED ON AMPHIPHILIC BLOCK COPOLYMERS WITH PENDANT CYCLIC ORTHOESTER. ACTA POLYM SIN 2009. [DOI: 10.3724/sp.j.1105.2009.00088] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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328
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Ultrasound triggered image-guided drug delivery. Eur J Radiol 2009; 70:242-53. [PMID: 19272727 DOI: 10.1016/j.ejrad.2009.01.051] [Citation(s) in RCA: 106] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2009] [Accepted: 01/14/2009] [Indexed: 12/27/2022]
Abstract
The integration of therapeutic interventions with diagnostic imaging has been recognized as one of the next technological developments that will have a major impact on medical treatments. Important advances in this field are based on a combination of progress in guiding and monitoring ultrasound energy, novel drug classes becoming available, the development of smart delivery vehicles, and more in depth understanding of the mechanisms of the cellular and molecular basis of diseases. Recent research demonstrates that both pressure sensitive and temperature sensitive delivery systems hold promise for local treatment. The use of ultrasound for the delivery of drugs has been demonstrated in particular the field of cardiology and oncology for a variety of therapeutics ranging from small drug molecules to biologics and nucleic acids.
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329
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Christian DA, Cai S, Bowen DM, Kim Y, Pajerowski JD, Discher DE. Polymersome carriers: from self-assembly to siRNA and protein therapeutics. Eur J Pharm Biopharm 2009; 71:463-74. [PMID: 18977437 PMCID: PMC2702089 DOI: 10.1016/j.ejpb.2008.09.025] [Citation(s) in RCA: 259] [Impact Index Per Article: 17.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2007] [Revised: 07/17/2008] [Accepted: 09/02/2008] [Indexed: 11/20/2022]
Abstract
Polymersomes are polymer-based vesicular shells that form upon hydration of amphiphilic block copolymers. These high molecular weight amphiphiles impart physicochemical properties that allow polymersomes to stably encapsulate or integrate a broad range of active molecules. This robustness together with recently described mechanisms for controlled breakdown of degradable polymersomes as well as escape from endolysosomes suggests that polymersomes might be usefully viewed as having structure/property/function relationships somewhere between lipid vesicles and viral capsids. Here we summarize the assembly and development of controlled release polymersomes to encapsulate therapeutics ranging from small molecule anti-cancer drugs to siRNA and therapeutic proteins.
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Affiliation(s)
- David A. Christian
- Biophysical Engineering and NanoBio-Polymers Lab, University of Pennsylvania, Philadelphia, Pennsylvania 19104;
| | - Shenshen Cai
- Biophysical Engineering and NanoBio-Polymers Lab, University of Pennsylvania, Philadelphia, Pennsylvania 19104;
| | - Diana M. Bowen
- Biophysical Engineering and NanoBio-Polymers Lab, University of Pennsylvania, Philadelphia, Pennsylvania 19104;
| | - Younghoon Kim
- Biophysical Engineering and NanoBio-Polymers Lab, University of Pennsylvania, Philadelphia, Pennsylvania 19104;
| | - J. David Pajerowski
- Biophysical Engineering and NanoBio-Polymers Lab, University of Pennsylvania, Philadelphia, Pennsylvania 19104;
| | - Dennis E. Discher
- Biophysical Engineering and NanoBio-Polymers Lab, University of Pennsylvania, Philadelphia, Pennsylvania 19104;
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330
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Xiao C, Tian H, Zhuang X, Chen X, Jing X. Recent developments in intelligent biomedical polymers. ACTA ACUST UNITED AC 2009. [DOI: 10.1007/s11426-008-0151-z] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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331
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Ghosh S, Yesilyurt V, Savariar EN, Irvin K, Thayumanavan S. Redox, Ionic Strength, and pH Sensitive Supramolecular Polymer Assemblies. JOURNAL OF POLYMER SCIENCE. PART A, POLYMER CHEMISTRY 2009; 47:1052-1060. [PMID: 20062518 PMCID: PMC2758627 DOI: 10.1002/pola.23204] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
Supramolecular complex of a cationic surfactant and oppositely charged disulfide containing polyelectrolyte was found to form micelle type aggregates at concentration much lower than the critical aggregate concentration (CAC) of the surfactant itself. We show that this difference can be utilized to generate stimulus-sensitive disassembly of these structures. This can be achieved either by converting the polyelectrolyte counterions to monovalent counterions in response to a stimulus or by simply weakening the interaction between the polymer and the surfactant in the presence of a stimulus. We have utilized three different stimuli to demonstrate these possibilities.
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Affiliation(s)
- Suhrit Ghosh
- Department of Chemistry, University of Massachusetts, Amherst, Massachusetts 01003
| | - Volkan Yesilyurt
- Department of Chemistry, University of Massachusetts, Amherst, Massachusetts 01003
| | | | - Katharine Irvin
- Department of Chemistry, University of Massachusetts, Amherst, Massachusetts 01003
| | - S. Thayumanavan
- Department of Chemistry, University of Massachusetts, Amherst, Massachusetts 01003
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332
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Soussan E, Cassel S, Blanzat M, Rico-Lattes I. Wirkstofftransport mit weicher Materie: Matrix- und Vesikelvektoren. Angew Chem Int Ed Engl 2009. [DOI: 10.1002/ange.200802453] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
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333
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Soussan E, Cassel S, Blanzat M, Rico-Lattes I. Drug Delivery by Soft Matter: Matrix and Vesicular Carriers. Angew Chem Int Ed Engl 2009; 48:274-88. [DOI: 10.1002/anie.200802453] [Citation(s) in RCA: 360] [Impact Index Per Article: 24.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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334
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335
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336
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Xu B, Piñol R, Nono-Djamen M, Pensec S, Keller P, Albouy PA, Lévy D, Li MH. Self-assembly of liquid crystal block copolymer PEG-b-smectic polymer in pure state and in dilute aqueous solution. Faraday Discuss 2009; 143:235-50; discussion 265-75. [DOI: 10.1039/b902003a] [Citation(s) in RCA: 50] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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337
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Xu H, Meng F, Zhong Z. Reversibly crosslinked temperature-responsive nano-sized polymersomes: synthesis and triggered drug release. ACTA ACUST UNITED AC 2009. [DOI: 10.1039/b901141b] [Citation(s) in RCA: 149] [Impact Index Per Article: 9.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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338
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Delaittre G, Dire C, Rieger J, Putaux JL, Charleux B. Formation of polymer vesicles by simultaneous chain growth and self-assembly of amphiphilic block copolymers. Chem Commun (Camb) 2009:2887-9. [DOI: 10.1039/b903040a] [Citation(s) in RCA: 137] [Impact Index Per Article: 9.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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339
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Chan JM, Zhang L, Yuet KP, Liao G, Rhee JW, Langer R, Farokhzad OC. PLGA-lecithin-PEG core-shell nanoparticles for controlled drug delivery. Biomaterials 2008; 30:1627-34. [PMID: 19111339 DOI: 10.1016/j.biomaterials.2008.12.013] [Citation(s) in RCA: 498] [Impact Index Per Article: 31.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2008] [Accepted: 12/04/2008] [Indexed: 11/18/2022]
Abstract
Current approaches to encapsulate and deliver therapeutic compounds have focused on developing liposomal and biodegradable polymeric nanoparticles (NPs), resulting in clinically approved therapeutics such as Doxil/Caelyx and Genexol-PM, respectively. Our group recently reported the development of biodegradable core-shell NP systems that combined the beneficial properties of liposomal and polymeric NPs for controlled drug delivery. Herein we report the parameters that alter the biological and physicochemical characteristics, stability, drug release properties and cytotoxicity of these core-shell NPs. We further define scalable processes for the formulation of these NPs in a reproducible manner. These core-shell NPs consist of (i) a poly(D,L-lactide-co-glycolide) hydrophobic core, (ii) a soybean lecithin monolayer, and (iii) a poly(ethylene glycol) shell, and were synthesized by a modified nanoprecipitation method combined with self-assembly. Preparation of the NPs showed that various formulation parameters such as the lipid/polymer mass ratio and lipid/lipid-PEG molar ratio controlled NP physical stability and size. We encapsulated a model chemotherapy drug, docetaxel, in the NPs and showed that the amount of lipid coverage affected its drug release kinetics. Next, we demonstrated a potentially scalable process for the formulation, purification, and storage of NPs. Finally, we tested the cytotoxicity using MTT assays on two model human cell lines, HeLa and HepG2, and demonstrated the biocompatibility of these particles in vitro. Our data suggest that the PLGA-lecithin-PEG core-shell NPs may be a useful new controlled release drug delivery system.
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Affiliation(s)
- Juliana M Chan
- Department of Biology, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
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340
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Jiang X, Zhao B. Tuning Micellization and Dissociation Transitions of Thermo- and pH-Sensitive Poly(ethylene oxide)-b-poly(methoxydi(ethylene glycol) methacrylate-co-methacrylic acid) in Aqueous Solution by Combining Temperature and pH Triggers. Macromolecules 2008. [DOI: 10.1021/ma8018238] [Citation(s) in RCA: 76] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Xueguang Jiang
- Department of Chemistry, University of Tennessee, Knoxville, Tennessee 37996
| | - Bin Zhao
- Department of Chemistry, University of Tennessee, Knoxville, Tennessee 37996
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341
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Li Y, Du W, Sun G, Wooley KL. pH-Responsive Shell Cross-Linked Nanoparticles with Hydrolytically Labile Cross-Links. Macromolecules 2008. [DOI: 10.1021/ma801737p] [Citation(s) in RCA: 97] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Yali Li
- Department of Chemistry and Radiology, Washington University in Saint Louis, One Brookings Drive, CB 1134, Saint Louis, Missouri 63130-4899
| | - Wenjun Du
- Department of Chemistry and Radiology, Washington University in Saint Louis, One Brookings Drive, CB 1134, Saint Louis, Missouri 63130-4899
| | - Guorong Sun
- Department of Chemistry and Radiology, Washington University in Saint Louis, One Brookings Drive, CB 1134, Saint Louis, Missouri 63130-4899
| | - Karen L. Wooley
- Department of Chemistry and Radiology, Washington University in Saint Louis, One Brookings Drive, CB 1134, Saint Louis, Missouri 63130-4899
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342
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Abstract
Nanoparticles show their promise for improving the efficacy of drugs with a narrow therapeutic window or low bioavailability, such as anticancer drugs and nucleic acid-based drugs. The pharmacokinetics (PK) and tissue distribution of the nanoparticles largely define their therapeutic effect and toxicity. Chemical and physical properties of the nanoparticles, including size, surface charge, and surface chemistry, are important factors that determine their PK and biodistribution. The intracellular fate of the nanoparticles after cellular internalization that affects the drug bioavailability is also discussed. Strategies for overcoming barriers for intracellular delivery and drug release are presented. Finally, future directions for improving the PK of nanoparticles and perspectives in the field are discussed.
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Affiliation(s)
- Shyh-Dar Li
- School of Pharmacy, University of North Carolina, Chapel Hill, NC 27599, USA
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343
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Hofman JW, Carstens MG, van Zeeland F, Helwig C, Flesch FM, Hennink WE, van Nostrum CF. Photocytotoxicity of mTHPC (temoporfin) loaded polymeric micelles mediated by lipase catalyzed degradation. Pharm Res 2008; 25:2065-73. [PMID: 18597164 PMCID: PMC2515570 DOI: 10.1007/s11095-008-9590-7] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2008] [Accepted: 04/03/2008] [Indexed: 11/25/2022]
Abstract
PURPOSE To study the in vitro photocytotoxicity and cellular uptake of biodegradable polymeric micelles loaded with the photosensitizer mTHPC, including the effect of lipase-catalyzed micelle degradation. METHODS Micelles of mPEG750-b-oligo(epsilon-caprolactone)5 (mPEG750-b-OCL5) with a hydroxyl (OH), benzoyl (Bz) or naphthoyl (Np) end group were formed and loaded with mTHPC by the film hydration method. The cellular uptake of the loaded micelles, and their photocytotoxicity on human neck squamous carcinoma cells in the absence and presence of lipase were compared with free and liposomal mTHPC (Fospeg). RESULTS Micelles composed of mPEG750-b-OCL5 with benzoyl and naphtoyl end groups had the highest loading capacity up to 30% (w/w), likely due to pi-pi interactions between the aromatic end group and the photosensitizer. MTHPC-loaded benzoylated micelles (0.5 mg/mL polymer) did not display photocytotoxicity or any mTHPC-uptake by the cells, in contrast to free and liposomal mTHPC. After dilution of the micelles below the critical aggregation concentration (CAC), or after micelle degradation by lipase, photocytotoxicity and cellular uptake of mTHPC were restored. CONCLUSION The high loading capacity of the micelles, the high stability of mTHPC-loaded micelles above the CAC, and the lipase-induced release of the photosensitizer makes these micelles very promising carriers for photodynamic therapy in vivo.
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Affiliation(s)
- Jan-Willem Hofman
- Department of Pharmaceutics, Faculty of Pharmaceutical Sciences, Utrecht Institute for Pharmaceutical Sciences (UIPS), Utrecht University, P.O. Box 80.082, 3508 TB Utrecht, The Netherlands
| | - Myrra G. Carstens
- Department of Pharmaceutics, Faculty of Pharmaceutical Sciences, Utrecht Institute for Pharmaceutical Sciences (UIPS), Utrecht University, P.O. Box 80.082, 3508 TB Utrecht, The Netherlands
- Division of Drug Delivery Technology, Leiden/Amsterdam Center for Drug Research (LACDR), Leiden, The Netherlands
| | - Femke van Zeeland
- Department of Pharmaceutics, Faculty of Pharmaceutical Sciences, Utrecht Institute for Pharmaceutical Sciences (UIPS), Utrecht University, P.O. Box 80.082, 3508 TB Utrecht, The Netherlands
| | - Conny Helwig
- Department of Pharmaceutics, Faculty of Pharmaceutical Sciences, Utrecht Institute for Pharmaceutical Sciences (UIPS), Utrecht University, P.O. Box 80.082, 3508 TB Utrecht, The Netherlands
| | - Frits M. Flesch
- Department of Biomedical Analysis, Faculty of Pharmaceutical Sciences, Utrecht Institute for Pharmaceutical Sciences (UIPS), Utrecht University, Utrecht, The Netherlands
| | - Wim E. Hennink
- Department of Pharmaceutics, Faculty of Pharmaceutical Sciences, Utrecht Institute for Pharmaceutical Sciences (UIPS), Utrecht University, P.O. Box 80.082, 3508 TB Utrecht, The Netherlands
| | - Cornelus F. van Nostrum
- Department of Pharmaceutics, Faculty of Pharmaceutical Sciences, Utrecht Institute for Pharmaceutical Sciences (UIPS), Utrecht University, P.O. Box 80.082, 3508 TB Utrecht, The Netherlands
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344
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Adams DJ, Adams S, Atkins D, Butler MF, Furzeland S. Impact of mechanism of formation on encapsulation in block copolymer vesicles. J Control Release 2008; 128:165-70. [PMID: 18436325 DOI: 10.1016/j.jconrel.2008.03.006] [Citation(s) in RCA: 57] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/02/2008] [Revised: 03/04/2008] [Accepted: 03/06/2008] [Indexed: 11/19/2022]
Abstract
Vesicles prepared from block copolymers have been mooted for the encapsulation of water-soluble molecules. This is because the membranes of polymer vesicles have been shown to be more stable than those in vesicles formed from lipids, with the membrane properties being tuned by the length and nature of the hydrophobic block in the polymer. The generally accepted mechanisms of vesicle formation involve either wrap-up of a lamellar sheet or formation via a sequence of micelle to worm to disks to vesicles. These should lead to efficient encapsulation. Alternatively, a method involving phase separation followed by re-structuring has been recently suggested. Here, we show that this final mechanism holds for vesicles formed from a PEO-b-PDEAMA copolymer by a pH switch and that this mechanism leads to highly inefficient encapsulation on vesicle formation.
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Affiliation(s)
- Dave J Adams
- Unilever Corporate Research, Colworth, Sharnbrook, Bedford, MK44 1LQ, United Kingdom.
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345
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Jiang X, Lavender CA, Woodcock JW, Zhao B. Multiple Micellization and Dissociation Transitions of Thermo- and Light-Sensitive Poly(ethylene oxide)-b-poly(ethoxytri(ethylene glycol) acrylate-co-o-nitrobenzyl acrylate) in Water. Macromolecules 2008. [DOI: 10.1021/ma7028105] [Citation(s) in RCA: 178] [Impact Index Per Article: 11.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Xueguang Jiang
- Department of Chemistry, University of Tennessee, Knoxville, Tennessee 37996
| | | | | | - Bin Zhao
- Department of Chemistry, University of Tennessee, Knoxville, Tennessee 37996
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346
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Ganta S, Devalapally H, Shahiwala A, Amiji M. A review of stimuli-responsive nanocarriers for drug and gene delivery. J Control Release 2008; 126:187-204. [PMID: 18261822 DOI: 10.1016/j.jconrel.2007.12.017] [Citation(s) in RCA: 1533] [Impact Index Per Article: 95.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2007] [Accepted: 12/03/2007] [Indexed: 11/15/2022]
Abstract
Nanotechnology has shown tremendous promise in target-specific delivery of drugs and genes in the body. Although passive and active targeted-drug delivery has addressed a number of important issues, additional properties that can be included in nanocarrier systems to enhance the bioavailability of drugs at the disease site, and especially upon cellular internalization, are very important. A nanocarrier system incorporated with stimuli-responsive property (e.g., pH, temperature, or redox potential), for instance, would be amenable to address some of the systemic and intracellular delivery barriers. In this review, we discuss the role of stimuli-responsive nanocarrier systems for drug and gene delivery. The advancement in material science has led to design of a variety of materials, which are used for development of nanocarrier systems that can respond to biological stimuli. Temperature, pH, and hypoxia are examples of "triggers" at the diseased site that could be exploited with stimuli-responsive nanocarriers. With greater understanding of the difference between normal and pathological tissues and cells and parallel developments in material design, there is a highly promising role of stimuli-responsive nanocarriers for drug and gene delivery in the future.
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Affiliation(s)
- Srinivas Ganta
- Department of Pharmaceutical Sciences, School of Pharmacy, Northeastern University, 110 Mugar Life Sciences Building, Boston, MA 02115, United States
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347
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Pharmaceutical Micelles: Combining Longevity, Stability, and Stimuli Sensitivity. MULTIFUNCTIONAL PHARMACEUTICAL NANOCARRIERS 2008. [DOI: 10.1007/978-0-387-76554-9_9] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
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348
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Stenzel MH. RAFT polymerization: an avenue to functional polymeric micelles for drug delivery. Chem Commun (Camb) 2008:3486-503. [DOI: 10.1039/b805464a] [Citation(s) in RCA: 191] [Impact Index Per Article: 11.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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349
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350
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Yin H, Lee ES, Kim D, Lee KH, Oh KT, Bae YH. Physicochemical characteristics of pH-sensitive poly(L-histidine)-b-poly(ethylene glycol)/poly(L-lactide)-b-poly(ethylene glycol) mixed micelles. J Control Release 2007; 126:130-8. [PMID: 18187224 DOI: 10.1016/j.jconrel.2007.11.014] [Citation(s) in RCA: 134] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2007] [Revised: 11/20/2007] [Accepted: 11/26/2007] [Indexed: 10/22/2022]
Abstract
A novel pH-sensitive polymeric micellar system composed of poly(L-histidine)-b-poly(ethylene glycol) and poly(L-lactide)-b-poly(ethylene glycol) block copolymers was studied by dynamic/static light scattering, spectrofluorimetry and differential scanning calorimetry. The mixed micelles displayed ultra Ph Sensitivity Which Could Be Tuned By Varying The Mixing Ratio Of The Two Polymers. In Particular, Mixed Micelles Composed Of 25 Wt.% Poly(L-lactide)-b-poly(ethylene glycol) exhibited desirable pH dependency which could be used as a drug delivery system that selectively targeted the extracellular pH of acidic solid tumors. Micelles were quite stable from pH 7.4 to 7.0 but underwent a two-stage destabilization as pH decreased further. A significant increase in size and aggregation number was observed when pH dropped to 6.8. Further disruption of the micelle core eventually caused phase separation in the micelle core and dissociation of ionized poly(L-histidine)-b-poly(ethylene glycol) molecules from the micelles as pH decreased to 6.0. Increased electrostatic repulsions which arise from the progressive protonation of imidazole rings overwhelming the hydrophobic interactions among uncharged neutral blocks is considered to be the mechanism for destabilization of the micelle core.
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Affiliation(s)
- Haiqing Yin
- Department of Pharmaceutics and Pharmaceutical Chemistry, University of Utah, 421 Wakara Way, Suite 318, Salt Lake City, Utah 84108, USA
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