51
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Yu H, Xia D, Zhu Q, Zhu C, Chen D, Gan Y. Supersaturated polymeric micelles for oral cyclosporine A delivery. Eur J Pharm Biopharm 2013; 85:1325-36. [DOI: 10.1016/j.ejpb.2013.08.003] [Citation(s) in RCA: 71] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2013] [Revised: 08/01/2013] [Accepted: 08/05/2013] [Indexed: 01/01/2023]
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52
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Koutroumanis KP, Holdich RG, Georgiadou S. Synthesis and micellization of a pH-sensitive diblock copolymer for drug delivery. Int J Pharm 2013; 455:5-13. [DOI: 10.1016/j.ijpharm.2013.06.071] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2013] [Revised: 06/22/2013] [Accepted: 06/27/2013] [Indexed: 10/26/2022]
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53
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Synthesis of magnetite/polyamino-ester dendrimer based on PCL/PEG amphiphilic copolymers via convergent approach for targeted diagnosis and therapy. POLYMER 2013. [DOI: 10.1016/j.polymer.2013.07.074] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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54
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Chen YC, Lo CL, Hsiue GH. Multifunctional nanomicellar systems for delivering anticancer drugs. J Biomed Mater Res A 2013; 102:2024-38. [PMID: 23828850 DOI: 10.1002/jbm.a.34850] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2013] [Accepted: 06/10/2013] [Indexed: 12/26/2022]
Abstract
Most anticancer drugs cause severe side effect due to the lack of selectivity for cancer cells. In recent years, new strategies of micellar systems, which design for specifically target anticancer drugs to tumors, are developed at the forefront of polymeric science. To improve efficiency of delivery and cancer specificity, considerable emphasis has been placed on the development of micellar systems with passive and active targeting. In this review article, we summarized various strategies of designing multifunctional micellar systems in the purpose of improving delivery efficiency. Micellar systems compose of a multifunctional copolymer or a mixture of two or more copolymers with different properties is a plausible approach to tuning the resulting properties and satisfied various requirements for anticancer drug delivery. It appears that multifunctional micellar systems hold great potential in cancer therapy.
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Affiliation(s)
- Yi-Chun Chen
- Department of Chemical Engineering, National Tsing Hua University, Hsinchu, 300, Taiwan, ROC; Department of Chemical Engineering and R&D Center for Membrane Technology, Chung Yuan Christian University, Chungli, 320, Taiwan, ROC
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55
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Hernán Pérez de la Ossa D, Gil-Alegre ME, Ligresti A, Aberturas MDR, Molpeceres J, Torres AI, Di Marzo V. Preparation and characterization of Δ(9)-tetrahydrocannabinol-loaded biodegradable polymeric microparticles and their antitumoral efficacy on cancer cell lines. J Drug Target 2013; 21:710-8. [PMID: 23773072 DOI: 10.3109/1061186x.2013.809089] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
Cannabinoids present an interesting therapeutic potential as antiemetics, appetite stimulants in debilitating diseases (cancer, AIDS and multiple sclerosis), analgesics, and in the treatment of multiple sclerosis and cancer, among other conditions. However, despite their high clinical potential, only few dosage forms are available to date. In this paper, the development of Δ(9)-tetrahydrocannabinol (THC) biodegradable microspheres as an alternative delivery system for cannabinoid parenteral administration is proposed. Tetrahydrocannabinol was encapsulated into biodegradable microspheres by the oil-in-water (o/w) emulsion solvent evaporation method. Several formulations were prepared using different drug:polymer ratios. The influence of antioxidant (α-tocopherol acetate) concentration on the release of THC from the microparticles was studied. Elevated process yield and entrapment efficiencies were achieved. The in vitro drug release studies showed that the encapsulated drug was released over a two week period. As THC has shown therapeutic potential as anticancer drug, the efficacy of the microspheres was tested on different cancer cell lines. Interestingly, the microspheres were able to inhibit cancer cell proliferation during the nine-day study period. All the above results suggest that the use of biodegradable microspheres would be a suitable alternative delivery system for THC administration.
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56
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Zeng S, Xiong MP. Trilayer micelles for combination delivery of rapamycin and siRNA targeting Y-box binding protein-1 (siYB-1). Biomaterials 2013; 34:6882-92. [PMID: 23768780 DOI: 10.1016/j.biomaterials.2013.05.010] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2013] [Accepted: 05/06/2013] [Indexed: 12/20/2022]
Abstract
A three layer (trilayer) polymeric micelle system based on the self-association of the triblock polymer poly(ethylene glycol)-b-poly{N-[N-(2-aminoethyl)-2-aminoethyl] aspartamide}-b-poly(ε-caprolactone) (PEG-b-PAsp(DET)-b-PCL) has been synthesized and investigated for combination delivery of rapamycin (RAP) and siRNA targeting Y-box binding protein-1 (siYB-1). The trilayer micelle is composed of (a) a hydrophilic poly(ethylene glycol) (PEG) block constituting the outer layer to improve pharmacokinetics, (b) an intermediate compartment composed of the cationic poly{2-[(2-aminoethyl)amino] ethyl aspartamide} (PAsp(DET)) segment for interacting with siYB-1, and (c) an inner hydrophobic poly(ε-caprolactone) (PCL) compartment for encapsulation of RAP. A major advantage of this system is biocompatibility since PEG and PCL are both approved by the FDA, and PAsp(DET) is a non-toxic pH responsive cationic poly(amino acid)-based polymer. In this study, it has been shown that PCL can encapsulate RAP with high loading efficiencies, and PAsp(DET) can successfully interact with siRNA for efficient transfection/knockdown with negligible cytotoxicity. The enhanced therapeutic efficacy of RAP/siYB-1 micelles was demonstrated in cell cultures and in a PC3 xenograft nude mouse model of human prostate cancer. Herein, we demonstrate that trilayer micelles are a promising approach to improve the simultaneous delivery of combination siRNA/drug therapies.
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Affiliation(s)
- San Zeng
- Division of Pharmaceutical Sciences, School of Pharmacy, University of Wisconsin, 777 Highland Avenue, Madison, WI 53705-2222, USA
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57
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Elastin-based protein polymer nanoparticles carrying drug at both corona and core suppress tumor growth in vivo. J Control Release 2013; 171:330-8. [PMID: 23714121 DOI: 10.1016/j.jconrel.2013.05.013] [Citation(s) in RCA: 70] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2013] [Revised: 05/09/2013] [Accepted: 05/18/2013] [Indexed: 11/22/2022]
Abstract
Numerous nanocarriers of small molecules depend on either non-specific physical encapsulation or direct covalent linkage. In contrast, this manuscript explores an alternative encapsulation strategy based on high-specificity avidity between a small molecule drug and its cognate protein target fused to the corona of protein polymer nanoparticles. With the new strategy, the drug associates tightly to the carrier and releases slowly, which may decrease toxicity and promote tumor accumulation via the enhanced permeability and retention effect. To test this hypothesis, the drug Rapamycin (Rapa) was selected for its potent anti-proliferative properties, which give it immunosuppressant and anti-tumor activity. Despite its potency, Rapa has low solubility, low oral bioavailability, and rapid systemic clearance, which make it an excellent candidate for nanoparticulate drug delivery. To explore this approach, genetically engineered diblock copolymers were constructed from elastin-like polypeptides (ELPs) that assemble small (<100nm) nanoparticles. ELPs are protein polymers of the sequence (Val-Pro-Gly-Xaa-Gly)n, where the identity of Xaa and n determine their assembly properties. Initially, a screening assay for model drug encapsulation in ELP nanoparticles was developed, which showed that Rose Bengal and Rapa have high non-specific encapsulation in the core of ELP nanoparticles with a sequence where Xaa=Ile or Phe. While excellent at entrapping these drugs, their release was relatively fast (2.2h half-life) compared to their intended mean residence time in the human body. Having determined that Rapa can be non-specifically entrapped in the core of ELP nanoparticles, FK506 binding protein 12 (FKBP), which is the cognate protein target of Rapa, was genetically fused to the surface of these nanoparticles (FSI) to enhance their avidity towards Rapa. The fusion of FKBP to these nanoparticles slowed the terminal half-life of drug release to 57.8h. To determine if this class of drug carriers has potential applications in vivo, FSI/Rapa was administered to mice carrying a human breast cancer model (MDA-MB-468). Compared to free drug, FSI encapsulation significantly decreased gross toxicity and enhanced the anti-cancer activity. In conclusion, protein polymer nanoparticles decorated with the cognate receptor of a high potency, low solubility drug (Rapa) efficiently improved drug loading capacity and its release. This approach has applications to the delivery of Rapa and its analogs; furthermore, this strategy has broader applications in the encapsulation, targeting, and release of other potent small molecules.
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58
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Gao C, Wang Y, Gou P, Cai X, Li X, Zhu W, Shen Z. Synthesis and characterization of resorcinarene-centered amphiphilic A8B4miktoarm star copolymers based on poly(ε-caprolactone) and poly(ethylene glycol) by combination of CROP and “click” chemistry. ACTA ACUST UNITED AC 2013. [DOI: 10.1002/pola.26670] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Affiliation(s)
- Chen Gao
- Department of Polymer Science and Engineering; MOE Key Laboratory of Macromolecular Synthesis and Functionalization; Zhejiang University; Hangzhou 310027 People's Republic of China
| | - Ying Wang
- Department of Polymer Science and Engineering; MOE Key Laboratory of Macromolecular Synthesis and Functionalization; Zhejiang University; Hangzhou 310027 People's Republic of China
| | - Pengfei Gou
- Dongfang Turbine Co. Ltd; Deyang 618000 China
| | - Xia Cai
- Affiliated Stomatology Hospital; School of Medicine; Zhejiang University; Hangzhou 310006 China
| | - Xiaodong Li
- Affiliated Stomatology Hospital; School of Medicine; Zhejiang University; Hangzhou 310006 China
| | - Weipu Zhu
- Department of Polymer Science and Engineering; MOE Key Laboratory of Macromolecular Synthesis and Functionalization; Zhejiang University; Hangzhou 310027 People's Republic of China
| | - Zhiquan Shen
- Department of Polymer Science and Engineering; MOE Key Laboratory of Macromolecular Synthesis and Functionalization; Zhejiang University; Hangzhou 310027 People's Republic of China
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59
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Poly(styrene oxide)-poly(ethylene oxide) block copolymers: From “classical” chemotherapeutic nanocarriers to active cell-response inducers. J Control Release 2013; 167:68-75. [DOI: 10.1016/j.jconrel.2013.01.010] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2012] [Revised: 01/10/2013] [Accepted: 01/14/2013] [Indexed: 01/21/2023]
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60
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Cambón A, Rey-Rico A, Mistry D, Brea J, Loza MI, Attwood D, Barbosa S, Alvarez-Lorenzo C, Concheiro A, Taboada P, Mosquera V. Doxorubicin-loaded micelles of reverse poly(butylene oxide)-poly(ethylene oxide)-poly(butylene oxide) block copolymers as efficient "active" chemotherapeutic agents. Int J Pharm 2013; 445:47-57. [PMID: 23380628 DOI: 10.1016/j.ijpharm.2013.01.056] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2012] [Accepted: 01/24/2013] [Indexed: 12/31/2022]
Abstract
Five reverse poly(butylene oxide)-poly(ethylene oxide)-poly(butylene oxide) block copolymers, BOnEOmBOn, with BO ranging from 8 to 21 units and EO from 90 to 411 were synthesized and evaluated as efficient chemotherapeutic drug delivery nanocarriers and inhibitors of the P-glycoprotein (P-gp) efflux pump in a multidrug resistant (MDR) cell line. The copolymers were obtained by reverse polymerization of poly(butylene oxide), which avoids transfer reaction and widening of the EO block distribution, commonly found in commercial poly(ethylene oxide)-poly(propylene oxide) block copolymers (poloxamers). BOnEOmBOn copolymers formed spherical micelles of 10-40 nm diameter at lower concentrations (one order of magnitude) than those of equivalent poloxamers. The influence of copolymer block lengths and BO/EO ratios on the solubilization capacity and protective environment for doxorubicin (DOXO) was investigated. Micelles showed drug loading capacity ranging from ca. 0.04% to 1.5%, more than 150 times the aqueous solubility of DOXO, and protected the cargo from hydrolysis for more than a month due to their greater colloidal stability in solution. Drug release profiles at various pHs, and the cytocompatibility and cytotoxicity of the DOXO-loaded micelles were assessed in vitro. DOXO loaded in the polymeric micelles accumulated more slowly inside the cells than free DOXO due to its sustained release. All copolymers were found to be cytocompatible, with viability extents larger than 95%. In addition, the cytotoxicity of DOXO-loaded micelles was higher than that observed for free drug solutions in a MDR ovarian NCI-ADR-RES cell line which overexpressed P-gp. The inhibition of the P-gp efflux pump by some BOnEOmBOn copolymers, similar to that measured for the common P-gp inhibitor verapamil, favored the retention of DOXO inside the cell increasing its cytotoxic activity. Therefore, poly(butylene oxide)-poly(ethylene oxide) block copolymers offer interesting features as cell response modifiers to complement their role as efficient nanocarriers for cancer chemotherapy.
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Affiliation(s)
- A Cambón
- Grupo de Física de Coloides y Polímeros, Departamento de Física de la Materia Condensada, Universidad de Santiago de Compostela, 15782 Santiago de Compostela, Spain
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61
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Huang CL, Kumar S, Tan JJ, Boey FY, Venkatraman SS, Steele TW, Loo JS. Modulating drug release from poly(lactic-co-glycolic acid) thin films through terminal end-groups and molecular weight. Polym Degrad Stab 2013. [DOI: 10.1016/j.polymdegradstab.2012.11.012] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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62
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Cai R, Li R, Qian J, Xie A, Nie K. The morphology and fabrication of nanostructured micelle by a novel block copolymer with linear-dendritic structure. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2013; 33:2070-7. [PMID: 23498234 DOI: 10.1016/j.msec.2013.01.032] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/13/2012] [Revised: 01/11/2013] [Accepted: 01/14/2013] [Indexed: 10/27/2022]
Abstract
We report here a novel approach to fabricate a nanostructured micelle as potential drug carriers and the relationship between the morphological structure and the preparation condition. The polymeric micelle aggregates constructed by self-assembly compose of the poly(ε-caprolactone)/monomethoxy poly(ethylene glycol) linear-dendritic block copolymers. The corresponding copolymers were synthesized by using ring opening polymerization of ε-caprolactone (CL) and a dendritic poly(ether-amide) (DPEA-OH) as an initiator, then coupling with the isocyanate end-capped linear monomethoxy polyethylene glycol. Fluorescence spectroscopy, dynamic light scattering (DLS) and transmission electron microscopy (TEM) were performed to characterize the copolymer micelles. The critical micelle concentration (CMC) was determined to be 1.623 mg/L. The hydrodynamic radius (Rh) and the polydispersity index (PDI) are influenced by the concentration of the micelle solutions. The multiple morphologies of the micelle aggregates, including spheres, rob-like dendritic structure and vesicles were observed, which the variety depends on the various preparation conditions. The nanostructured micelles based on the linear-dendritic block copolymer possess the strong thermodynamic stability and the power of solubilization of hydrophobic drug molecules.
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Affiliation(s)
- Rulin Cai
- Anhui Province Key Laboratory of Environment-Friendly Polymer Materials, College of Chemistry and Chemical Engineering, Anhui University, Hefei, Anhui 230039, China
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63
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Cao L, Li G, Yang D, Liu J, Huang Y. Application of Response Surface Methodology To Formulation Optimization of Rapamycin Loaded Magnetic Fe3O4/Carboxymethylchitosan Nanoparticles. JOURNAL OF MACROMOLECULAR SCIENCE PART A-PURE AND APPLIED CHEMISTRY 2013. [DOI: 10.1080/10601325.2013.802548] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
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64
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Pharmacokinetic Evaluation of a DSPE-PEG2000 Micellar Formulation of Ridaforolimus in Rat. Pharmaceutics 2012; 5:81-93. [PMID: 24300398 PMCID: PMC3834941 DOI: 10.3390/pharmaceutics5010081] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2012] [Revised: 12/20/2012] [Accepted: 12/21/2012] [Indexed: 11/25/2022] Open
Abstract
The rapamycin analog, ridaforolimus, has demonstrated potent anti-proliferative effects in cancer treatment, and it currently is being evaluated in a range of clinical cancer studies. Ridaforolimus is an extremely lipophilic compound with limited aqueous solubility, which may benefit from formulation with polymeric micelles. Herein, we report the encapsulation of ridaforolimus in 1,2-distearoyl-sn-glycero-3-phosphoethanolamine-N-methoxy-poly(ethylene glycol 2000) (DSPE-PEG2000) via a solvent extraction technique. Micelle loading greatly improved the solubility of ridaforolimus by approximately 40 times from 200 μg/mL to 8.9 mg/mL. The diameters of the drug-loaded micelles were 33 ± 15 nm indicating they are of appropriate size to accumulate within the tumor site via the enhanced permeability and retention (EPR) effect. The DSPE-PEG2000 micelle formulation was dosed intravenously to rats at 10 mg/kg and compared to a control of ridaforolimus in ethanol/PEG 400. The micelle significantly increased the half-life of ridaforolimus by 170% and decreased the clearance by 58%, which is consistent with improved retention of the drug in the plasma by the micelle formulation.
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65
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Chen YC, Lo CL, Lin YF, Hsiue GH. Rapamycin encapsulated in dual-responsive micelles for cancer therapy. Biomaterials 2012; 34:1115-27. [PMID: 23146436 DOI: 10.1016/j.biomaterials.2012.10.034] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2012] [Accepted: 10/11/2012] [Indexed: 02/08/2023]
Abstract
Rapamycin has been developed as a potential anticancer drug for treatment in rapamycin-sensitive cancer models, but its poor water solubility greatly hampers the application to cancer therapy. This study investigated the preparation, release profiles, uptake and in vitro/in vivo study of a dual-responsive micellar formulation of rapamycin. Rapamycin-loaded micelles (rapa-micelles) measured approximately ca. 150 nm with narrow size distribution and high stability in bovine serum albumin solution. It was shown that rapamycin could be loaded efficiently in mixed micelles up to a concentration of 1.8 mg/mL by a hot shock protocol. Rapamycin release kinetic studies demonstrated that this type of micellar system could be applied in physiological conditions under varied pH environments. Confocal and pH-topography imaging revealed a clear distribution of rapa-micelles, and visible intracellular pH changes which induced encapsulated rapamycin to be released and then induced autophagolysosome formation. In vivo tumor growth inhibition showed that rapa-micelles exhibited excellent antitumor activity and a high rate of apoptosis in HCT116 cancer cells. These results indicated that dual-responsive mixed micelles provided a suitable delivery system for the parenteral administration of drugs with poor water solubility, such as rapamycin, in cancer therapy.
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Affiliation(s)
- Yi-Chun Chen
- Department of Chemical Engineering, National Tsing Hua University Hsinchu, Hsinchu 300, Taiwan, ROC
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66
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Zamani S, Khoee S. Preparation of core–shell chitosan/PCL-PEG triblock copolymer nanoparticles with ABA and BAB morphologies: Effect of intraparticle interactions on physicochemical properties. POLYMER 2012. [DOI: 10.1016/j.polymer.2012.09.051] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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67
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Liu H, Li S, Zhang M, Shao W, Zhao Y. Facile synthesis of ABCDE‐type H‐shaped quintopolymers by combination of ATRP, ROP, and click chemistry and their potential applications as drug carriers. ACTA ACUST UNITED AC 2012. [DOI: 10.1002/pola.26285] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Affiliation(s)
- Huanhuan Liu
- Department of Polymer Science and Engineering, Jiangsu Key Laboratory of Advanced Functional Polymer Design and Application, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, China
| | - Shixian Li
- Department of Polymer Science and Engineering, Jiangsu Key Laboratory of Advanced Functional Polymer Design and Application, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, China
| | - Meijing Zhang
- Department of Polymer Science and Engineering, Jiangsu Key Laboratory of Advanced Functional Polymer Design and Application, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, China
| | - Wei Shao
- Department of Polymer Science and Engineering, Jiangsu Key Laboratory of Advanced Functional Polymer Design and Application, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, China
| | - Youliang Zhao
- Department of Polymer Science and Engineering, Jiangsu Key Laboratory of Advanced Functional Polymer Design and Application, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, China
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68
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Dash TK, Konkimalla VB. Polymeric Modification and Its Implication in Drug Delivery: Poly-ε-caprolactone (PCL) as a Model Polymer. Mol Pharm 2012; 9:2365-79. [DOI: 10.1021/mp3001952] [Citation(s) in RCA: 130] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Tapan K. Dash
- School of Biological Sciences,
National Institute of
Science Education and Research, Institute of Physics Campus, Sainik
School, Sachivalaya marg, Bhubaneswar-751005, India
| | - V. Badireenath Konkimalla
- School of Biological Sciences,
National Institute of
Science Education and Research, Institute of Physics Campus, Sainik
School, Sachivalaya marg, Bhubaneswar-751005, India
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69
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Wang Z, Yu Y, Ma J, Zhang H, Zhang H, Wang X, Wang J, Zhang X, Zhang Q. LyP-1 Modification To Enhance Delivery of Artemisinin or Fluorescent Probe Loaded Polymeric Micelles to Highly Metastatic Tumor and Its Lymphatics. Mol Pharm 2012; 9:2646-57. [DOI: 10.1021/mp3002107] [Citation(s) in RCA: 51] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Zhaohui Wang
- State Key Laboratory of Natural
and Biomimetic Drugs, School of Pharmaceutical Sciences, Peking University,
Beijing 100191, China
| | - Yang Yu
- State Key Laboratory of Natural
and Biomimetic Drugs, School of Pharmaceutical Sciences, Peking University,
Beijing 100191, China
| | - Jie Ma
- State
Key Laboratory of Molecular
Oncology, Cancer Institute/Hospital, Chinese Academy of Medical Sciences,
Beijing 100021, China
| | - Haoran Zhang
- State Key Laboratory of Natural
and Biomimetic Drugs, School of Pharmaceutical Sciences, Peking University,
Beijing 100191, China
| | - Hua Zhang
- State Key Laboratory of Natural
and Biomimetic Drugs, School of Pharmaceutical Sciences, Peking University,
Beijing 100191, China
| | - Xueqing Wang
- State Key Laboratory of Natural
and Biomimetic Drugs, School of Pharmaceutical Sciences, Peking University,
Beijing 100191, China
| | - Jiancheng Wang
- State Key Laboratory of Natural
and Biomimetic Drugs, School of Pharmaceutical Sciences, Peking University,
Beijing 100191, China
| | - Xuan Zhang
- State Key Laboratory of Natural
and Biomimetic Drugs, School of Pharmaceutical Sciences, Peking University,
Beijing 100191, China
| | - Qiang Zhang
- State Key Laboratory of Natural
and Biomimetic Drugs, School of Pharmaceutical Sciences, Peking University,
Beijing 100191, China
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70
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Mohamed EA, Zhao Y, Meshali MM, Remsberg CM, Borg TM, Foda AMM, Takemoto JK, Sayre CL, Martinez SE, Davies NM, Forrest ML. Vorinostat with sustained exposure and high solubility in poly(ethylene glycol)-b-poly(DL-lactic acid) micelle nanocarriers: characterization and effects on pharmacokinetics in rat serum and urine. J Pharm Sci 2012; 101:3787-98. [PMID: 22806441 DOI: 10.1002/jps.23265] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2012] [Revised: 06/15/2012] [Accepted: 06/27/2012] [Indexed: 11/11/2022]
Abstract
The histone deacetylase inhibitor suberoylanilide hydroxamic acid, known as vorinostat, is a promising anticancer drug with a unique mode of action; however, it is plagued by low water solubility, low permeability, and suboptimal pharmacokinetics. In this study, poly(ethylene glycol)-b-poly(DL-lactic acid) (PEG-b-PLA) micelles of vorinostat were developed. Vorinostat's pharmacokinetics in rats was investigated after intravenous (i.v.) (10 mg/kg) and oral (p.o.) (50 mg/kg) micellar administrations and compared with a conventional polyethylene glycol 400 solution and methylcellulose suspension. The micelles increased the aqueous solubility of vorinostat from 0.2 to 8.15 ± 0.60 and 10.24 ± 0.92 mg/mL at drug to nanocarrier ratios of 1:10 and 1:15, respectively. Micelles had nanoscopic mean diameters of 75.67 ± 7.57 and 87.33 ± 8.62 nm for 1:10 and 1:15 micelles, respectively, with drug loading capacities of 9.93 ± 0.21% and 6.91 ± 1.19%, and encapsulation efficiencies of 42.74 ± 1.67% and 73.29 ± 4.78%, respectively. The micelles provided sustained exposure and improved pharmacokinetics characterized by a significant increase in serum half-life, area under curve, and mean residence time. The micelles reduced vorinostat clearance particularly after i.v. dosing. Thus, PEG-b-PLA micelles significantly improved the p.o. and i.v. pharmacokinetics and bioavailability of vorinostat, which warrants further investigation.
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Affiliation(s)
- Elham A Mohamed
- College of Pharmacy, Department of Pharmaceutical Sciences, Washington State University, Pullman, Washington 99164-6534, USA
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71
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Cholkar K, Patel A, Vadlapudi AD, Mitra AK. Novel Nanomicellar Formulation Approaches for Anterior and Posterior Segment Ocular Drug Delivery. ACTA ACUST UNITED AC 2012; 2:82-95. [PMID: 25400717 DOI: 10.2174/1877912311202020082] [Citation(s) in RCA: 93] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
One of the most challenging areas of pharmaceutical research is ocular drug delivery. The unique anatomy and physiology of the eye impedes drug permeation to deeper ocular tissues. Nanosized carrier systems such as nanoparticles, liposomes, suspensions, dendrimers, and nanomicelles are being explored for ocular drug delivery. In this review, we have focused on application of emerging nanomicellar carrier systems in ocular drug delivery. Nanomicelles are nanosized vesicular carriers formed from amphiphilic monomer units. Surfactant and polymeric micellar nanocarriers provide an amenable means to improve drug solubilization, develop clear aqueous formulations and deliver drugs to anterior and posterior ocular tissues. Nanomicelles due to their amphiphilic nature encapsulate hydrophobic drugs and aid in drug delivery. Various methods are employed to develop nanosized micellar formulations depending upon the physicochemical properties of the drug. Nanomicellar carriers appear to be promising vehicles with potential applications in ocular drug delivery. In this review, we attempted to discuss about the progress in ocular drug delivery research using nanomicelles as carriers from the published literature and issued patents. Also, with regards to ocular static and dynamic barriers which prevent drug permeation, a brief discussion about nanomicelles, types of nanomicelles, their methods of preparation and micellar strategy to overcome ocular barriers, delivering therapeutic levels of drugs to anterior and posterior ocular tissues are discussed.
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Affiliation(s)
- Kishore Cholkar
- Division of Pharmaceutical Sciences, School of Pharmacy, 5258 Health Science Building, University of Missouri-Kansas City, 2464 Charlotte Street, Kansas City, MO 64108, USA
| | - Ashaben Patel
- Division of Pharmaceutical Sciences, School of Pharmacy, 5258 Health Science Building, University of Missouri-Kansas City, 2464 Charlotte Street, Kansas City, MO 64108, USA
| | - Aswani Dutt Vadlapudi
- Division of Pharmaceutical Sciences, School of Pharmacy, 5258 Health Science Building, University of Missouri-Kansas City, 2464 Charlotte Street, Kansas City, MO 64108, USA
| | - Ashim K Mitra
- Division of Pharmaceutical Sciences, School of Pharmacy, 5258 Health Science Building, University of Missouri-Kansas City, 2464 Charlotte Street, Kansas City, MO 64108, USA
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72
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Pearson RM, Bae JW, Sunoqrot S, Uddin S, Hong S. Facilitated self-assembly of novel dendron-based copolymers. ANNUAL INTERNATIONAL CONFERENCE OF THE IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY. IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY. ANNUAL INTERNATIONAL CONFERENCE 2012; 2011:8334-6. [PMID: 22256279 DOI: 10.1109/iembs.2011.6092055] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
Self-assembly of newly synthesized dendron-based amphiphilic copolymers with controlled hydrophilic-lipophilic balances has been investigated to evaluate their potential as a novel nanocarrier. The hydroxyl-terminated polyester dendron (G3) bearing a focal alkyne moiety was used to mediate the combination of poly(s-caprolactone) (PCL) with multiple polyethylene glycol (PEG) moieties. Four types of PCL-G3-mPEG with different block lengths were prepared and their structures were confirmed by (1)H NMR, FT-IR, and GPC. Critical micelle concentration (CMC) values varied from 6.50 × 10(-8) to 3.52 × 10(-7) M, which were lower than those reported for linear PCL-mPEG. TEM revealed that all PCL-G3-mPEG micelles were spherical with an average diameter of 20 nm. The drug release profile for each PCL-G3-mPEG was investigated by loading indomethacin (IMC), as a model drug, within the micelles. IMC was released in a controlled manner over 72 hours. Synthesized copolymers used in this study were also found to be non-cytotoxic at concentrations up to 100 μM. The low CMC, along with the controlled morphology, release profile and biocompatibility, all demonstrate the potential of the dendron-based micelles as a novel nanocarrier.
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Affiliation(s)
- Ryan M Pearson
- Department of Biopharmaceutical Sciences, University of Illinois, Chicago, IL 60612, USA
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73
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Petrova S, Kolev I, Miloshev S, Apostolova MD, Mateva R. Synthesis of amphiphilic [PEO(PCL)₂] triarm star-shaped block copolymers: a promising system for in cell delivery. JOURNAL OF MATERIALS SCIENCE. MATERIALS IN MEDICINE 2012; 23:1225-1234. [PMID: 22415360 DOI: 10.1007/s10856-012-4592-8] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/08/2011] [Accepted: 02/15/2012] [Indexed: 05/31/2023]
Abstract
The paper reports on a simple method of synthesizing [PEO(PCL)(2)] triarm star-shaped copolymers by a combination of Michael-addition type reaction and ring-opening polymerization. A Michael-addition reaction yielded a PEO end-capped by two hydroxyl groups-a [PEO(OH)(2)] macroinitiator-which was used for sequential building of PCL blocks. The macroinitiator and copolymers were analyzed by FTIR, (1)H NMR spectroscopy and SEC. The self-assembly behavior of the copolymers in aqueous media was studied by UV-Vis spectroscopy. The size and morphology of the obtained micelles were determined by TEM. None of the polymers had cytotoxic effects in vitro. Cellular uptake studies showed the accumulation of neutral red loaded micelles in the perinuclear area of human hepatocellular carcinoma cells revealing a cellular uptake associated with macropinocytosis and caveolae mediated endocytosis. The accumulation had a sustained effect over 3 days pointing at the potential application of the copolymers micelles as a drug delivery system.
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Affiliation(s)
- Svetlana Petrova
- Institute of Polymers, Bulgarian Academy of Sciences, Acad. G. Bonchev str., bl. 103-A, 1113 Sofia, Bulgaria
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74
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Zhao Y, Duan S, Zeng X, Liu C, Davies NM, Li B, Forrest ML. Prodrug strategy for PSMA-targeted delivery of TGX-221 to prostate cancer cells. Mol Pharm 2012; 9:1705-16. [PMID: 22494444 DOI: 10.1021/mp3000309] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
TGX-221 is a potent, selective, and cell membrane permeable inhibitor of the PI3K p110β catalytic subunit. Recent studies showed that TGX-221 has antiproliferative activity against PTEN-deficient tumor cell lines including prostate cancers. The objective of this study was to develop an encapsulation system for parenterally delivering TGX-221 to the target tissue through a prostate-specific membrane aptamer (PSMAa10) with little or no side effects. In this study, PEG-PCL micelles were formulated to encapsulate the drug, and a prodrug strategy was pursued to improve the stability of the carrier system. Fluorescence imaging studies demonstrated that the cellular uptake of both drug and nanoparticles was significantly improved by targeted micelles in a PSMA positive cell line. The area under the plasma concentration time curve of the micelle formulation in nude mice was 2.27-fold greater than that of the naked drug, and the drug clearance rate was 6.16-fold slower. These findings suggest a novel formulation approach for improving site-specific drug delivery of a molecular-targeted prostate cancer treatment.
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Affiliation(s)
- Yunqi Zhao
- Department of Pharmaceutical Chemistry, The University of Kansas , Simons Laboratories, 2095 Constant Ave. Rm. 136B, Lawrence, Kansas 66047, United States
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75
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Ukawala M, Rajyaguru T, Chaudhari K, Manjappa AS, Pimple S, Babbar AK, Mathur R, Mishra AK, Murthy RSR. Investigation on design of stable etoposide-loaded PEG-PCL micelles: effect of molecular weight of PEG-PCL diblock copolymer on thein vitroandin vivoperformance of micelles. Drug Deliv 2012; 19:155-67. [DOI: 10.3109/10717544.2012.657721] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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76
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Wang H, Han S, Sun J, Fan T, Tian C, Wu Y. Amphiphilic dextran derivatives nanoparticles for the delivery of mitoxantrone. J Appl Polym Sci 2012. [DOI: 10.1002/app.36534] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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77
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Cho H, Indig GL, Weichert J, Shin HC, Kwon GS. In vivo cancer imaging by poly(ethylene glycol)-b-poly(ɛ-caprolactone) micelles containing a near-infrared probe. NANOMEDICINE : NANOTECHNOLOGY, BIOLOGY, AND MEDICINE 2012; 8:228-36. [PMID: 21704593 PMCID: PMC3193583 DOI: 10.1016/j.nano.2011.06.009] [Citation(s) in RCA: 56] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/10/2010] [Revised: 02/24/2011] [Accepted: 06/08/2011] [Indexed: 11/21/2022]
Abstract
Noninvasive near-infrared (NIR) fluorescence imaging is a promising technique for the intraoperative assessment of solid tumor removal. We incorporated a lipophilic NIR probe, 1,1'-dioctadecyltetramethyl indotricarbocyanine iodide (DiR), in poly(ethylene glycol)-b-poly(ɛ-caprolactone) (PEG-b-PCL) micelles, resulting in DiR solubilization in water, occupying nanoscopic PEG-b-PCL micelles. DiR in a self-quenched or nonquenched state showed different kinetics of release from PEG-b-PCL micelles in vitro; however, both obtained high tumor delineation (tumor-to-muscle ratio of 30-43 from collected organs). These results suggest that PEG-b-PCL micelles with DiR are a promising nanosized imaging agent that will provide a basis for enhanced surgical guidance via NIR visualization of tumors. FROM THE CLINICAL EDITOR In this paper, noninvasive near-infrared fluorescence imaging coupled with specific lipophilic probes is discussed as a promising technique for intraoperative assessment of solid tumor removal, leading to optimized outcomes for in toto removal of tumors.
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Affiliation(s)
- Hyunah Cho
- Department of Pharmaceutical Science, School of Pharmacy, University of Wisconsin, Madison, Wisconsin 53705, USA
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78
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Zhang X, Xiao Y, Lang M. Synthesis and Self-Assembly Behaviors of Four-Arm Star Block Copolymers Poly(ϵ-caprolactone)-b-poly(2- (diethylamino) ethyl methacrylate)) in Aqueous Solution. JOURNAL OF MACROMOLECULAR SCIENCE PART A-PURE AND APPLIED CHEMISTRY 2012. [DOI: 10.1080/10601325.2012.641907] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
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79
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Chen WH, Hua MY, Lee RS. Synthesis and characterization of poly(ethylene glycol)-b-poly(ε-caprolactone) copolymers with functional side groups on the polyester block. J Appl Polym Sci 2012. [DOI: 10.1002/app.36225] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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80
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Letchford K, Burt HM. Copolymer micelles and nanospheres with different in vitro stability demonstrate similar paclitaxel pharmacokinetics. Mol Pharm 2012; 9:248-60. [PMID: 22204437 DOI: 10.1021/mp2002939] [Citation(s) in RCA: 54] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Paclitaxel loaded amphiphilic block copolymer nanoparticles have been demonstrated to enhance the aqueous solubility and improve the toxicity profile as compared to the commercially available product Taxol; however, in many cases long circulation of the drug is not achieved due to rapid partitioning of the drug from the carrier and/or carrier instability upon injection. In this work we investigated the effect of increasing the hydrophobic block length of methoxy poly(ethylene glycol)-block-poly(ε-caprolactone) (MePEG-b-PCL) copolymers on the physicochemical properties and in vitro stability of the formed nanoparticles as well as the pharmacokinetics and biodistribution of both the copolymer and solubilized drug. We hypothesized that copolymers composed of high molecular weight hydrophobic blocks (MePEG₁₁₄-b-PCL₁₀₄) that form nanoparticles with a kinetically "frozen core" (which we term nanospheres) would better retain their PTX payload as compared to micelles composed of shorter hydrophobic blocks (MePEG₁₁₄-b-PCL₁₉), thus leading to prolonged drug circulation. Nanospheres solubilized PTX more efficiently, released the drug in a more sustained fashion and were characterized by enhanced stability and drug retention in the presence of plasma proteins as compared to micelles. Using radiolabeled copolymers and PTX, it was found that, upon injection, MePEG₁₁₄-b-PCL₁₀₄ circulated for longer than MePEG₁₁₄-b-PCL₁₉; however, the drug was rapidly eliminated from the blood regardless of the formulation. These results suggest that, despite formulation in more stable nanospheres, PTX was still rapidly extracted from these nanoparticles.
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Affiliation(s)
- Kevin Letchford
- Faculty of Pharmaceutical Sciences, University of British Columbia , 2146 East Mall, Vancouver, BC, Canada V6T 1Z3
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81
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Wang W, Cheng D, Gong F, Miao X, Shuai X. Design of multifunctional micelle for tumor-targeted intracellular drug release and fluorescent imaging. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2012; 24:115-120. [PMID: 22143956 DOI: 10.1002/adma.201104066] [Citation(s) in RCA: 199] [Impact Index Per Article: 16.6] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/24/2011] [Indexed: 05/31/2023]
Affiliation(s)
- Weiwei Wang
- Center of Biomedical Engineering, Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou 510080, China
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82
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Dane KY, Nembrini C, Tomei AA, Eby JK, O'Neil CP, Velluto D, Swartz MA, Inverardi L, Hubbell JA. Nano-sized drug-loaded micelles deliver payload to lymph node immune cells and prolong allograft survival. J Control Release 2011; 156:154-60. [DOI: 10.1016/j.jconrel.2011.08.009] [Citation(s) in RCA: 70] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2011] [Revised: 07/29/2011] [Accepted: 08/05/2011] [Indexed: 12/13/2022]
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83
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The eradication of breast cancer and cancer stem cells using octreotide modified paclitaxel active targeting micelles and salinomycin passive targeting micelles. Biomaterials 2011; 33:679-91. [PMID: 22019123 DOI: 10.1016/j.biomaterials.2011.09.072] [Citation(s) in RCA: 156] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2011] [Accepted: 09/27/2011] [Indexed: 11/23/2022]
Abstract
Tumor stem cells have emerged as the new targets for anti-cancer therapy, besides tumor cells themselves. To eradicate both breast cancer cells and breast cancer stem cells which can not be eliminated by the conventional chemotherapy, octreotide (Oct)-modified paclitaxel (PTX)-loaded PEG-b-PCL polymeric micelles (Oct-M-PTX) and salinomycin (SAL)-loaded PEG-b-PCL polymeric micelles (M-SAL) were developed and investigated in combination. In this study, Oct that targets somatostatin receptors (SSTR) overexpressed in tumors including breast cancer, was coupled to the PEG end of PEG-b-PCL, and all the micelles were prepared using thin film hydration method. Results showed that the particle size of all the micelles was approximately 25-30 nm, and the encapsulation efficiency was >90%. Quantitative and qualitative analysis demonstrated that Oct facilitates the uptake of micelles in SSTR overexpressed breast cancer MCF-7 cells while free Oct inhibited cellular uptake of Oct-modified micelles, revealing the mechanism of receptor-mediated endocytosis. Breast cancer stem cells (side population cells, SP cells) were sorted from MCF-7 cells and identified with the CD44+/CD24- phenotype. M-SAL was capable of decreasing the proportion of SP cells, and its suppression was more potent in SP cells than that in cancer cells. As compared to PTX-loaded micelles (M-PTX), the inhibition of Oct-M-PTX against MCF-7 cells was stronger while such effect significantly increased when applying Oct-M-PTX in combination with M-SAL. In the MCF-7 xenografts, the combination therapy with Oct-M-PTX plus M-SAL produced the strongest antitumor efficacy, in accord with the combination treatment in vitro. Compared with free SAL, M-SAL was found to be more effective in suppressing breast cancer stem cells in vivo. Thus, this combination therapy may provide a strategy to improve treatment of breast cancers for eradication of breast cancer cells together with breast cancer stem cells.
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84
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Dai M, Xu X, Song J, Fu S, Gou M, Luo F, Qian Z. Preparation of camptothecin-loaded PCEC microspheres for the treatment of colorectal peritoneal carcinomatosis and tumor growth in mice. Cancer Lett 2011; 312:189-96. [PMID: 21943824 DOI: 10.1016/j.canlet.2011.08.007] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2011] [Revised: 08/07/2011] [Accepted: 08/08/2011] [Indexed: 02/05/2023]
Abstract
The aim of this study was to prepare PCL-PEG-PCL (PCEC) microspheres to protect camptothecin from hydrolysis, to extend its release time and to enhance its treatment efficacy on colorectal peritoneal carcinomatosis and tumor growth in mice. Camptothecin (CPT)-loaded PCL-PEG-PCL (PCEC) microspheres were prepared by oil-in-water emulsion solvent evaporation method. The particle size, morphological characteristics, encapsulation efficiency, in vitro drug release studies and in vitro cytotoxicity of CPT-loaded PCEC microspheres have been investigated. In vivo studies were carried out on Balb/c male mice bearing colorectal peritoneal carcinomatosis. CPT-loaded PCEC microspheres were applied to abdominal cavity of mice once a week. Free CPT was used as a positive control. On 14th day of treatment, mice were sacrificed and antitumor activities of CPT-loaded PCEC microspheres were evaluated. Compared with control group, a significant decrease in the number of tumor nodes was observed in group treated with CPT-loaded PCEC microspheres. Immunohistochemistry staining of tumor tissues with CD34 revealed that MVD positive cells were significantly reduced in CPT-loaded PCEC microspheres treated group in contrast to other groups (P<0.05). The CPT-loaded PCEC microspheres were considered potentially useful to treat the abdominal metastases of colon carcinoma.
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Affiliation(s)
- Mei Dai
- State Key Laboratory of Biotherapy and Cancer Center, West China Hospital, West China Medical School, Sichuan University, Chengdu, China
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85
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Bae JW, Pearson RM, Patra N, Sunoqrot S, Vuković L, Král P, Hong S. Dendron-mediated self-assembly of highly PEGylated block copolymers: a modular nanocarrier platform. Chem Commun (Camb) 2011; 47:10302-4. [PMID: 21858356 DOI: 10.1039/c1cc14331j] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
PEGylated dendron coils (PDCs) were investigated as a novel potential nanocarrier platform. PDCs self-assembled into micelles at lower CMCs than linear copolymer counterparts by 1-2 orders of magnitude, due to the unique architecture of dendrons. MD simulations also supported thermodynamically favourable self-assembly mediated by dendrons.
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Affiliation(s)
- Jin Woo Bae
- Department of Biopharmaceutical Sciences, University of Illinois at Chicago, 833 S. Wood St. Chicago, IL 60612, USA
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86
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Jee JP, McCoy A, Mecozzi S. Encapsulation and release of Amphotericin B from an ABC triblock fluorous copolymer. Pharm Res 2011; 29:69-82. [PMID: 21739321 DOI: 10.1007/s11095-011-0511-9] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2011] [Accepted: 06/10/2011] [Indexed: 01/08/2023]
Abstract
PURPOSE PEG-phospholipid-based micelles have been successfully used for the solubilization of several hydrophobic drugs but generally lack sustained stability in blood. Our novel PEG-Fluorocarbon-DSPE polymers were designed to increase stability and improve time-release properties of drug-loaded micelles. METHODS Novel ABC fluorous copolymers were synthesized, characterized, and used for encapsulation release of amphotericin B. FRET studies were used to study micelle stability. RESULTS The micelles formed by the new polymers showed lower critical micelle concentrations and higher viscosity cores than those formed by the polymers lacking the fluorous block. FRET studies indicated that fluorocarbon-containing micelles had increased stability in presence of human serum. Physicochemical properties and in vitro release profile of micelles loaded with Amphotericin B (AmB) were studied. CONCLUSIONS The effect of PEG length and fluorocarbon incorporation were investigated. The shorter hydrophilic PEG2K induced greater stability than PEG5K by decreasing the proportion of hydrophilic block of the polymer. The fluorocarbon placed between hydrophilic and hydrophobic block formed a fluorous shell contributing to the enhanced thermodynamic stability of micelles and to the drug sustained release. Polymer mPEG2K-F(10)-DSPE, bearing both a fluorocarbon block and a shorter mPEG, showed the greatest stability and the longest half-life for AmB release.
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Affiliation(s)
- Jun-Pil Jee
- School of Pharmacy, University of Wisconsin-Madison, 1101 University Avenue, Madison, Wisconsin 53706, USA
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87
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Chemiluminescent nanomicelles for imaging hydrogen peroxide and self-therapy in photodynamic therapy. J Biomed Biotechnol 2011; 2011:679492. [PMID: 21765637 PMCID: PMC3134417 DOI: 10.1155/2011/679492] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2011] [Revised: 03/18/2011] [Accepted: 03/24/2011] [Indexed: 11/20/2022] Open
Abstract
Hydrogen peroxide is a signal molecule of the tumor, and its overproduction makes a higher concentration in tumor tissue compared to normal tissue. Based on the fact that peroxalates can make chemiluminescence with a high efficiency in the presence of hydrogen peroxide, we developed nanomicelles composed of peroxalate ester oligomers and fluorescent dyes, called peroxalate nanomicelles (POMs), which could image hydrogen peroxide with high sensitivity and stability. The potential application of the POMs in photodynamic therapy (PDT) for cancer was also investigated. It was found that the PDT-drug-loaded POMs were sensitive to hydrogen peroxide, and the PDT drug could be stimulated by the chemiluminescence from the reaction between POMs and hydrogen peroxide, which carried on a self-therapy of the tumor without the additional laser light resource.
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88
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Yan J, Ye Z, Chen M, Liu Z, Xiao Y, Zhang Y, Zhou Y, Tan W, Lang M. Fine tuning micellar core-forming block of poly(ethylene glycol)-block-poly(ε-caprolactone) amphiphilic copolymers based on chemical modification for the solubilization and delivery of doxorubicin. Biomacromolecules 2011; 12:2562-72. [PMID: 21598958 DOI: 10.1021/bm200375x] [Citation(s) in RCA: 116] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
This study aimed to optimize poly(ethylene glycol)-b-poly(ε-caprolactone) (PEG-b-PCL)-based amphiphilic block copolymers for achieving a better micellar drug delivery system (DDS) with improved solubilization and delivery of doxorubicin (DOX). First, the Flory-Huggins interaction parameters between DOX and the core-forming segments [i.e., poly(ε-caprolactone) (PCL) and poly[(ε-caprolactone-co-γ-(carbamic acid benzyl ester)-ε-caprolactone] (P(CL-co-CABCL))] was calculated to assess the drug-polymer compatibility. The results indicated a better compatibility between DOX and P(CL-co-CABCL) than that between DOX and PCL, motivating the synthesis of monomethoxy-poly(ethylene glycol)-b-poly[(ε-caprolactone-co-γ-(carbamic acid benzyl ester)-ε-caprolactone] (mPEG-b-P(CL-co-CABCL)) block copolymer. Second, two novel block copolymers of mPEG-b-P(CL-co-CABCL) with different compositions were prepared via ring-opening polymerization of CL and CABCL using mPEG as a macroinitiator and characterized by (1)H NMR, FT-IR, GPC, WAXD, and DSC techniques. It was found that the introduction of CABCL decreased the crystallinity of mPEG-b-PCL copolymer. Micellar formation of the copolymers in aqueous solution was investigated with fluorescence spectroscopy, DLS and TEM. mPEG-b-P(CL-co-CABCL) copolymers had a lower critical micelle concentration (CMC) than mPEG-b-PCL and subsequently led to an improved stability of prepared micelles. Furthermore, both higher loading capacity and slower in vitro release of DOX were observed for micelles of copolymers with increased content of CABCL, attributed to both improved drug-core compatibility and favorable amorphous core structure. Meanwhile, DOX-loaded micelles facilitated better uptake of DOX by HepG2 cells and were mainly retained in the cytosol, whereas free DOX accumulated more in the nuclei. However, possibly because of the slower intracellular release of DOX, DOX-loaded micelles were less potent in inhibiting cell proliferation than free DOX in vitro. Taken together, the introduction of CABCL in the core-forming block of mPEG-b-PCL resulted in micelles with superior properties, which hold great promise for drug delivery applications.
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Affiliation(s)
- Jinliang Yan
- Key Laboratory for Ultrafine Materials of Ministry of Education, School of Materials Science and Engineering, East China University of Science and Technology, Shanghai, 200237, China
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89
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Mishra GP, Tamboli V, Jwala J, Mitra AK. Recent patents and emerging therapeutics in the treatment of allergic conjunctivitis. ACTA ACUST UNITED AC 2011; 5:26-36. [PMID: 21171952 DOI: 10.2174/187221311794474883] [Citation(s) in RCA: 48] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2010] [Accepted: 12/01/2010] [Indexed: 12/13/2022]
Abstract
Ocular allergy is an inflammatory response of the conjunctival mucosa that also affects the cornea and eyelids. Allergic conjunctivitis includes seasonal allergic conjunctivitis (SAC), perennial allergic conjunctivitis (PAC), vernal keratoconjunctivitis (VKC), atopic keratoconjunctivitis (AKC) and giant papillary conjunctivitis (GPC). In general, allergic conditions involve mast cell degranulation that leads to release of inflammatory mediators and activation of enzymatic cascades generating pro-inflammatory mediators. In chronic ocular inflammatory disorders associated with mast cell activation such as VKC and AKC constant inflammatory response is observed due to predominance of inflammatory mediators such as eosinophils and Th2-generated cytokines. Antihistamines, mast-cell stabilizers, nonsteroidal anti-inflammatory agents, corticosteroids and immunomodulatory agents are commonly indicated for the treatment of acute and chronic allergic conjunctivitis. In recent years newer drug molecules have been introduced in the treatment of allergic conjunctivitis. This article reviews recent patents and emerging therapeutics in the treatment of allergic conjunctivitis.
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Affiliation(s)
- Gyan P Mishra
- Division of Pharmaceutical Sciences, School of Pharmacy, University of Missouri-Kansas City, MO 64108-2718, USA
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90
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Steele TWJ, Huang CL, Widjaja E, Boey FYC, Loo JSC, Venkatraman SS. The effect of polyethylene glycol structure on paclitaxel drug release and mechanical properties of PLGA thin films. Acta Biomater 2011; 7:1973-83. [PMID: 21300188 DOI: 10.1016/j.actbio.2011.02.002] [Citation(s) in RCA: 52] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2010] [Revised: 12/21/2010] [Accepted: 02/02/2011] [Indexed: 01/28/2023]
Abstract
Thin films of poly(lactic acid-co-glycolic acid) (PLGA) incorporating paclitaxel typically have slow release rates of paclitaxel of the order of 1 μg day(-1) cm(-2). For implementation as medical devices a range of zero order release rates (i.e. 1-15 μg day(-1) cm(-2)) is desirable for different tissues and pathologies. Eight and 35 kDa molecular weight polyethylene glycol (PEG) was incorporated at 15%, 25% and 50% weight ratios into PLGA containing 10 wt.% paclitaxel. The mechanical properties were assessed for potential use as medical implants and the rates of release of paclitaxel were quantified as per cent release and the more clinically useful rate of release in μg day(-1) cm(-2). Paclitaxel quantitation was correlated with the release of PEG from PLGA, to further understand its role in paclitaxel/PLGA release modulation. PEG release was found to correlate with paclitaxel release and the level of crystallinity of the PEG in the PLGA film, as measured by Raman spectrometry. This supports the concept of using a phase separating, partitioning compound to increase the release rates of hydrophobic drugs such as paclitaxel from PLGA films, where paclitaxel is normally homogeneously distributed/dissolved. Two formulations are promising for medical device thin films, when optimized for tensile strength, elongation, and drug release. For slow rates of paclitaxel release an average of 3.8 μg day(-1) cm(-2) using 15% 35k PEG for >30 days was achieved, while a high rate of drug release of 12 μg day(-1) cm(-2) was maintained using 25% 8 kDa PEG for up to 12 days.
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Affiliation(s)
- Terry W J Steele
- Nanyang Technological University, Materials and Science Engineering, Division of Materials Technology, Singapore, Singapore
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91
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Nazemi A, Amos RC, Bonduelle CV, Gillies ER. Dendritic surface functionalization of biodegradable polymer assemblies. ACTA ACUST UNITED AC 2011. [DOI: 10.1002/pola.24686] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
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92
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Harada Y, Yamamoto T, Sakai M, Saiki T, Kawano K, Maitani Y, Yokoyama M. Effects of organic solvents on drug incorporation into polymeric carriers and morphological analyses of drug-incorporated polymeric micelles. Int J Pharm 2011; 404:271-80. [DOI: 10.1016/j.ijpharm.2010.11.016] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2010] [Revised: 10/21/2010] [Accepted: 11/11/2010] [Indexed: 10/18/2022]
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93
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Wang X, Gurski LA, Zhong S, Xu X, Pochan DJ, Farach-Carson MC, Jia X. Amphiphilic block co-polyesters bearing pendant cyclic ketal groups as nanocarriers for controlled release of camptothecin. JOURNAL OF BIOMATERIALS SCIENCE. POLYMER EDITION 2011; 22:1275-98. [PMID: 20594408 PMCID: PMC2974953 DOI: 10.1163/092050610x504260] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Amphiphilic block co-polymers consisting of hydrophilic poly(ethylene glycol) and hydrophobic polyester bearing pendent cyclic ketals were synthesized by ring-opening co-polymerization of ε-caprolactone (CL) and 1,4,8-trioxaspiro-[4,6]-9-undecanone (TSU) using α-hydroxyl, ω-methoxy, poly(ethylene glycol) as the initiator and stannous octoate as the catalyst. Compositional analyses indicate that TSU was randomly distributed in the hydrophobic blocks. When the TSU content in the co-polymers increased, the polymer crystallinity decreased progressively and the glass transition temperature increased accordingly. The hydrophobic, anticancer drug, camptothecin (CPT), was successfully encapsulated in the block copolymer nanoparticles. The CPT encapsulation efficiency and release kinetics were strongly dependent on the co-polymer composition and crystallinity. CPT release from nanoparticles constructed from co-polymers containing 0, 39 and 100 mol% TSU in the hydrophobic block followed the same trend, with an initial burst of approx. 40% within one day followed by a moderate and slow release lasting up to 7 days. At a TSU content of 14 mol%, CPT was released in a continuous and controlled fashion with a reduced initial burst and a 73% cumulative release by day 7. The in vitro cytoxicity assay showed that the blank nanoparticles were not toxic to the cultured bone metastatic prostate cancer cells (C4-2B). Compared to the free drug, the encapsulated CPT was more effective in inducing apoptotic responses in C4-2B cells. Modulating the physical characteristics of the amphiphilic co-polymers via co-polymerization offers a facile method for controlling the bioavailability of anticancer drugs, ultimately increasing effectiveness and minimizing toxicity.
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Affiliation(s)
- Xiaoying Wang
- Department of Materials Science and Engineering, Delaware Biotechnology Institute, University of Delaware, Newark DE 19716, USA
| | - Lisa A. Gurski
- Department of Biological Sciences, University of Delaware, Newark, DE 19716, USA
- Center for Translational Cancer Research, University of Delaware, Newark, DE 19716, USA
| | - Sheng Zhong
- Department of Materials Science and Engineering, Delaware Biotechnology Institute, University of Delaware, Newark DE 19716, USA
| | - Xian Xu
- Department of Materials Science and Engineering, Delaware Biotechnology Institute, University of Delaware, Newark DE 19716, USA
| | - Darrin J. Pochan
- Department of Materials Science and Engineering, Delaware Biotechnology Institute, University of Delaware, Newark DE 19716, USA
- Center for Translational Cancer Research, University of Delaware, Newark, DE 19716, USA
| | - Mary C. Farach-Carson
- Department of Biological Sciences, University of Delaware, Newark, DE 19716, USA
- Center for Translational Cancer Research, University of Delaware, Newark, DE 19716, USA
- Department of Biochemistry and Cell Biology, Rice University, Houston, TX 77251, USA
| | - Xinqiao Jia
- Department of Materials Science and Engineering, Delaware Biotechnology Institute, University of Delaware, Newark DE 19716, USA
- Center for Translational Cancer Research, University of Delaware, Newark, DE 19716, USA
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94
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Trevaskis NL, Charman WN, Porter CJH. Targeted drug delivery to lymphocytes: a route to site-specific immunomodulation? Mol Pharm 2010; 7:2297-309. [PMID: 20958081 DOI: 10.1021/mp100259a] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Lymphocytes are central to the progression of autoimmune disease, transplant rejection, leukemia, lymphoma and lymphocyte-resident viral diseases such as HIV/AIDs. Strategies to target drug treatments to lymphocytes, therefore, represent an opportunity to enhance therapeutic outcomes in disease states where many current treatment regimes are incompletely effective and promote significant toxicities. Here we demonstrate that highly lipophilic drug candidates that preferentially access the intestinal lymphatics after oral administration show significantly enhanced access to lymphocytes leading to improved immunomodulatory activity. When coadministered with such drugs, lipids enhance lymphocyte targeting via a three tiered action: promotion of drug absorption from the gastrointestinal tract, enhancement of lymphatic drug transport and stimulation of lymphocyte recruitment into the lymphatics. This strategy has been exemplified using a highly lipophilic immunosuppressant (JWH015) where coadministration with selected lipids led to significant increases in lymphatic transport, lymphocyte targeting and IL-4 and IL-10 expression in CD4+ and CD8+ lymphocytes after ex vivo mitogen stimulation. In contrast, administration of a 2.5-fold higher dose of JWH015 in a formulation that did not stimulate lymph transport had no effect on antiinflammatory cytokine levels, in spite of equivalent drug exposure in the blood. The current data suggest that complementary drug design and delivery strategies that combine highly lipophilic, lymphotropic drug candidates with lymph-directing formulations provide enhanced selectivity, potency and therapeutic potential for drug candidates with lymphocyte associated targets.
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Affiliation(s)
- Natalie L Trevaskis
- Drug Delivery, Disposition and Dynamics, Monash Institute of Pharmaceutical Sciences, Monash University, 381 Royal Parade, Parkville, Victoria, Australia
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95
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Abdur Rouf M, Vural I, Bilensoy E, Hincal A, Erol DD. Rapamycin-cyclodextrin complexation: improved solubility and dissolution rate. J INCL PHENOM MACRO 2010. [DOI: 10.1007/s10847-010-9885-2] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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96
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Sawant RR, Torchilin VP. Multifunctionality of lipid-core micelles for drug delivery and tumour targeting. Mol Membr Biol 2010; 27:232-46. [DOI: 10.3109/09687688.2010.516276] [Citation(s) in RCA: 72] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
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97
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Zhang W, Li Y, Liu L, Sun Q, Shuai X, Zhu W, Chen Y. Amphiphilic toothbrushlike copolymers based on poly(ethylene glycol) and poly(epsilon-caprolactone) as drug carriers with enhanced properties. Biomacromolecules 2010; 11:1331-8. [PMID: 20405912 DOI: 10.1021/bm100116g] [Citation(s) in RCA: 131] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Amphiphilic poly(ethylene glycol)-b-poly(2-hydroxyethyl methacrylate-g-poly(epsilon-caprolactone)) (PEG-b-P(HEMA-g-PCL)) toothbrushlike copolymers were synthesized and evaluated as drug delivery carriers. Two toothbrushlike polymers were synthesized via ring-opening polymerization of epsilon-caprolactone (CL) initiated by poly(ethylene glycol)-b-poly(2-hydroxyethyl methacrylate) (PEG-b-PHEMA) macromolecular initiators, and their molecular structures and physical properties were characterized using (1)H NMR, gel permeation chromatography (GPC), and differential scanning calorimetric analysis (DSC). The melting points and crystallizable temperature have been decreased obviously, implying that the PCL cores of PEG-b-P(HEMA-g-PCL) toothbrushlike copolymer micelles with shorter PCL segments were unlikely to crystallize at room temperature for drug delivery application. Also the micellization properties of toothbrushlike copolymers in aqueous solution were investigated by fluorescence spectroscopy, dynamic light scattering (DLS), and transmission electron microscopy (TEM). Compared with the micelles from linear PEG-b-PCL block copolymers, the micelles of PEG-b-P(HEMA-g-PCL)s exhibited higher loading capacity to the anticancer drug, doxorubicin (DOX), and the drug-loaded micelles were highly stable in aqueous solution. In vitro DOX release data and confocal laser scanning microscopy (CLSM) studies showed that DOX-loaded toothbrushlike copolymer micelles could be effectively internalized by bladder carcinoma EJ cells, and the DOX could be released into endocytic compartments and finally transported to the nucleus. Such toothbrushlike copolymer micelles can be analogues of linear PEG-b-PCL diblock copolymers, but demonstrated better properties of loading and release due to their hydrophobic PCL cores do not crystallize at delivery conditions.
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Affiliation(s)
- Wenlong Zhang
- State Key Laboratory of Polymer Physics and Chemistry, Institute of Chemistry, The Chinese Academy of Sciences, Beijing 100190, China
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98
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Zhao A, Zhou Q, Chen T, Weng J, Zhou S. Amphiphilic PEG-based ether-anhydride terpolymers: Synthesis, characterization, and micellization. J Appl Polym Sci 2010. [DOI: 10.1002/app.32724] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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99
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He WN, Xu JT, Du BY, Fan ZQ, Wang X. Inorganic-Salt-Induced Morphological Transformation of Semicrystalline Micelles of PCL-b-PEO Block Copolymer in Aqueous Solution. MACROMOL CHEM PHYS 2010. [DOI: 10.1002/macp.201000184] [Citation(s) in RCA: 67] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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100
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Wang X, Kan B, Wang Y, Dong P, Shi S, Guo G, Zhao Y, Luo F, Zhao X, Wei Y, Qian Z. Safety Evaluation of Amphiphilic Three-Armed Star-Shaped Copolymer Micelles. J Pharm Sci 2010; 99:2830-8. [DOI: 10.1002/jps.22042] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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