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Sanderson L, da Silva M, Sekhar GN, Brown RC, Burrell-Saward H, Fidanboylu M, Liu B, Dailey LA, Dreiss CA, Lorenz C, Christie M, Persaud SJ, Yardley V, Croft SL, Valero M, Thomas SA. Drug reformulation for a neglected disease. The NANOHAT project to develop a safer more effective sleeping sickness drug. PLoS Negl Trop Dis 2021; 15:e0009276. [PMID: 33857146 PMCID: PMC8078842 DOI: 10.1371/journal.pntd.0009276] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2020] [Revised: 04/27/2021] [Accepted: 02/26/2021] [Indexed: 01/16/2023] Open
Abstract
Background Human African trypanosomiasis (HAT or sleeping sickness) is caused by the
parasite Trypanosoma brucei sspp. The disease has two
stages, a haemolymphatic stage after the bite of an infected tsetse fly,
followed by a central nervous system stage where the parasite penetrates the
brain, causing death if untreated. Treatment is stage-specific, due to the
blood-brain barrier, with less toxic drugs such as pentamidine used to treat
stage 1. The objective of our research programme was to develop an
intravenous formulation of pentamidine which increases CNS exposure by some
10–100 fold, leading to efficacy against a model of stage 2 HAT. This target
candidate profile is in line with drugs for neglected diseases inititative
recommendations. Methodology To do this, we evaluated the physicochemical and structural characteristics
of formulations of pentamidine with Pluronic micelles (triblock-copolymers
of polyethylene-oxide and polypropylene oxide), selected candidates for
efficacy and toxicity evaluation in vitro, quantified
pentamidine CNS delivery of a sub-set of formulations in vitro and
in vivo, and progressed one pentamidine-Pluronic formulation
for further evaluation using an in vivo single dose brain
penetration study. Principal Findings Screening pentamidine against 40 CNS targets did not reveal any major
neurotoxicity concerns, however, pentamidine had a high affinity for the
imidazoline2 receptor. The reduction in insulin secretion in
MIN6 β-cells by pentamidine may be secondary to pentamidine-mediated
activation of β-cell imidazoline receptors and impairment of cell viability.
Pluronic F68 (0.01%w/v)-pentamidine formulation had a similar inhibitory
effect on insulin secretion as pentamidine alone and an additive
trypanocidal effect in vitro. However, all Pluronics tested
(P85, P105 and F68) did not significantly enhance brain exposure of
pentamidine. Significance These results are relevant to further developing block-copolymers as
nanocarriers, improving BBB drug penetration and understanding the side
effects of pentamidine. Sleeping sickness or human African Trypanosomiasis (HAT) is a disease caused by a
parasite, which is transferred to humans by the bite of an infected tsetse fly.
There are two disease stages: the first stage is the blood-based stage of the
disease and the second stage affects the brain. It is fatal if left untreated.
The blood-brain barrier (BBB) makes the brain stage difficult to treat because
it prevents 99% of all drugs from entering the brain from the blood. Those
anti-HAT drugs that do enter the brain are toxic and have serious side effects.
Pentamidine is a less toxic blood stage drug, which our research has shown has a
limited ability to cross the BBB due to its removal by proteins called
transporters. The objective of this study was to use Pluronic to improve
pentamidine delivery to target sites, whilst reducing its side effects. Pluronic
is a polymer, which can assemble into micelles and encapsulate the drug. Thus,
prolonging its circulation time and protecting it. Our study indicated that the
selected Pluronics did not increase the brain delivery of pentamidine. However.
Pluronic-pentamidine formulations were identified that harboured trypanocidal
activity and did not increase safety concerns compared to unformulated
pentamidine.
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Affiliation(s)
- Lisa Sanderson
- King’s College London, Institute of Pharmaceutical Science,
Franklin-Wilkins Building, Stamford Street, London, United
Kingdom
| | - Marcelo da Silva
- King’s College London, Institute of Pharmaceutical Science,
Franklin-Wilkins Building, Stamford Street, London, United
Kingdom
| | - Gayathri N. Sekhar
- King’s College London, Institute of Pharmaceutical Science,
Franklin-Wilkins Building, Stamford Street, London, United
Kingdom
| | - Rachel C. Brown
- King’s College London, Institute of Pharmaceutical Science,
Franklin-Wilkins Building, Stamford Street, London, United
Kingdom
| | - Hollie Burrell-Saward
- Faculty of Infectious and Tropical Diseases, London School of Hygiene and
Tropical Medicine, London, United Kingdom
| | - Mehmet Fidanboylu
- King’s College London, Institute of Pharmaceutical Science,
Franklin-Wilkins Building, Stamford Street, London, United
Kingdom
| | - Bo Liu
- King’s College London, Department of Diabetes, School of Life Course
Sciences, Faculty of Life Sciences & Medicine, London, United
Kingdom
| | - Lea Ann Dailey
- King’s College London, Institute of Pharmaceutical Science,
Franklin-Wilkins Building, Stamford Street, London, United
Kingdom
| | - Cécile A. Dreiss
- King’s College London, Institute of Pharmaceutical Science,
Franklin-Wilkins Building, Stamford Street, London, United
Kingdom
| | - Chris Lorenz
- King’s College London, Theory & Simulation of Condensed Matter Group,
Department of Physics, Strand, London, United Kingdom
| | - Mark Christie
- King’s College London, Institute of Pharmaceutical Science,
Franklin-Wilkins Building, Stamford Street, London, United
Kingdom
| | - Shanta J. Persaud
- King’s College London, Department of Diabetes, School of Life Course
Sciences, Faculty of Life Sciences & Medicine, London, United
Kingdom
| | - Vanessa Yardley
- Faculty of Infectious and Tropical Diseases, London School of Hygiene and
Tropical Medicine, London, United Kingdom
| | - Simon L. Croft
- Faculty of Infectious and Tropical Diseases, London School of Hygiene and
Tropical Medicine, London, United Kingdom
| | - Margarita Valero
- Physical Chemistry Department, Faculty of Pharmacy, University of
Salamanca, Salamanca, Spain
| | - Sarah A. Thomas
- King’s College London, Institute of Pharmaceutical Science,
Franklin-Wilkins Building, Stamford Street, London, United
Kingdom
- * E-mail:
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Sotoudegan F, Sotoudegan F, Talebkhan Garoosi Y, Afshar SH, Barkhordari F, Davami F. Anti-Aβ-scFv-loaded polymeric nano-micelles with enhanced plasma stability. J Pharm Pharmacol 2021; 73:460-472. [PMID: 33793837 DOI: 10.1093/jpp/rgaa068] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2020] [Accepted: 12/23/2020] [Indexed: 01/03/2023]
Abstract
OBJECTIVES Immunotherapy using recombinant monoclonal antibodies specifically Anti-amyloid-beta (Anti-Aβ) scFv is envisaged as an appropriate therapeutic for Alzheimer through reduction of amyloid-beta aggregation. The solubilization of therapeutics using polymeric micelles facilitates an improved bioavailability and extended blood half-life. In this study, the optimum production condition for Anti-amyloid-beta (Anti-Aβ) scFv was obtained. To increase the stability of plasma, Anti-Aβ-loaded polymeric micelles were synthesized. METHODS Escherichia coli SHuffle expression strain was used and purified by Ni-NTA. Pluronics P85 and F127 micelles were used for the Anti-Aβ delivery and were characterized in terms of morphology, drug loading and drug release in phosphate buffer and artificial cerebrospinal fluid. The stability profile was quantified at 4°C over a 30 days storage period. The stability in human plasma was also evaluated. KEY FINDINGS Proteins expressed in SHuffle resulted in increased levels of protein expression and solubility. Low critical micelle concentration value and high micelle encapsulation efficiency (<200 nm) achieved via direct dissolution method. Anti-Aβ-loaded micelles were around 2.2-fold more stable than Anti-Aβ in plasma solution. A sustained in-vitro release of Anti-Aβ from micelles was observed. CONCLUSIONS Results confirmed that Pluronic-micelles pose benefits as a nano-carrier to increase the stability of Anti-Aβ scFvin in the plasma.
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Affiliation(s)
- Farnaz Sotoudegan
- Biotechnology Research Center, Pasteur Institute of Iran, Tehran, Iran
| | - Farzaneh Sotoudegan
- Pharmaceutical Quality Assurance Research Center, The Institute of Pharmaceutical Sciences (TIPS), Tehran University of Medical Sciences, Tehran, Iran
| | | | - Sahar H Afshar
- Faculty of Pharmacy International Campus, Tehran University of Medical Sciences, Tehran, Iran
| | | | - Fatemeh Davami
- Biotechnology Research Center, Pasteur Institute of Iran, Tehran, Iran
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4
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Senthilkumar M, Dash S. Interaction of methylparaben and propylparaben with P123/F127 mixed polymeric micelles. Colloids Surf B Biointerfaces 2019; 176:140-149. [DOI: 10.1016/j.colsurfb.2018.12.068] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2018] [Revised: 12/28/2018] [Accepted: 12/29/2018] [Indexed: 10/27/2022]
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5
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Rey-Rico A, Cucchiarini M. PEO-PPO-PEO Tri-Block Copolymers for Gene Delivery Applications in Human Regenerative Medicine-An Overview. Int J Mol Sci 2018. [PMID: 29518011 PMCID: PMC5877636 DOI: 10.3390/ijms19030775] [Citation(s) in RCA: 43] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023] Open
Abstract
Lineal (poloxamers or Pluronic®) or X-shaped (poloxamines or Tetronic®) amphiphilic tri-block copolymers of poly(ethylene oxide) and poly(propylene oxide) (PEO-PPO-PEO) have been broadly explored for controlled drug delivery in different regenerative medicine approaches. The ability of these copolymers to self-assemble as micelles and to undergo sol-to-gel transitions upon heating has endowed the denomination of “smart” or “intelligent” systems. The use of PEO-PPO-PEO copolymers as gene delivery systems is a powerful emerging strategy to improve the performance of classical gene transfer vectors. This review summarizes the state of art of the application of PEO-PPO-PEO copolymers in both nonviral and viral gene transfer approaches and their potential as gene delivery systems in different regenerative medicine approaches.
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Affiliation(s)
- Ana Rey-Rico
- Center of Experimental Orthopaedics, Saarland University Medical Center, Kirrbergerstr. Bldg 37, D-66421 Homburg/Saar, Germany.
- Centro de Investigacións Científicas Avanzadas (CICA), Universidade da Coruña, Campus de A Coruña, 15071 A Coruña, Spain.
| | - Magali Cucchiarini
- Center of Experimental Orthopaedics, Saarland University Medical Center, Kirrbergerstr. Bldg 37, D-66421 Homburg/Saar, Germany.
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6
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Yang X, Chen Q, Yang J, Wu S, Liu J, Li Z, Liu D, Chen X, Qiu Y. Tumor-Targeted Accumulation of Ligand-Installed Polymeric Micelles Influenced by Surface PEGylation Crowdedness. ACS APPLIED MATERIALS & INTERFACES 2017; 9:44045-44052. [PMID: 29192755 DOI: 10.1021/acsami.7b16764] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
With respect to the intriguing biocompatibility and the stealthy functions of poly(ethylene glycol) (PEG), PEGylated nanoparticulates have been intensively engineered for utilities as drug delivery vehicles. To advocate the targeted drug transportation, targeting ligands were strategically installed onto the surface of PEGylated nanoparticulates. The previous in vitro investigations revealed that the ligand-specified cell endocytosis of nanoparticulates was pronounced for the nanoparticulates with adequately high PEG crowdedness. The present study aims to explore insight into the impact of PEGylation degree on in vivo tumor-targeted accumulation activities of cRGD-installed nanoparticulates. The subsequent investigations verified the importance of the PEGylation crowdedness in pursuit of prolonged retention in the blood circulation post intravenous administration. Unprecedentedly, the PEGylation crowdedness was also identified as a crucial important parameter to pursue the tumor-targeted accumulation. A plausible reason is the elevated PEGylation crowdedness eliciting the restricted involvement in nonspecific protein adsorption of nanoparticulates in the biological milieu and consequently pronouncing the ligand-receptor-mediated binding for the nanoparticulates. Noteworthy was the distinctive performance of the class of the proposed systems once utilized for transportation of the mRNA payload to the tumors. The protein expression in the targeted tumors appeared to follow a clear PEGylation crowdedness dependence manner, where merely 2-fold PEGylation crowdedness led to remarkably 10-fold augmentation in protein expression in tumors. Hence, the results provided important information and implications for design of active-targeting PEGylated nanomaterials to fulfill the targeting strategies in systemic applications.
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Affiliation(s)
- Xi Yang
- Department of Neurosurgery, Renji Hospital, School of Medicine, Shanghai Jiao Tong University , No. 1630 Dongfang Road, Shanghai 200127, China
| | - Qixian Chen
- School of Life Science and Biotechnology, Dalian University of Technology , No. 2 Linggong Road, Dalian 116024, China
| | - Jinjun Yang
- School of Environmental Science and Safety Engineering, Tianjin University of Technology , Xiqing District, Tianjin 300384, China
| | - Sudong Wu
- Ningbo Institute of Materials Technology and Engineering, China Academy of Sciences , Ningbo 315201, China
| | - Jun Liu
- Ningbo Hygeia Medical Technology Co., Ltd., No. 6 Jingyuan Road, High-Tech Zone, Ningbo 315040, China
| | - Zhen Li
- Dalian Medical University, No. 9 West Section Lvshun South Road, Dalian 116044, China
| | - Deqiang Liu
- The No. 2 People's Hospital of Tongxiang, No. 18 Qingyangdong Road, Congfu Town, Tongxiang 314511, China
| | - Xiyi Chen
- Dalian Medical University, No. 9 West Section Lvshun South Road, Dalian 116044, China
| | - Yongming Qiu
- Department of Neurosurgery, Renji Hospital, School of Medicine, Shanghai Jiao Tong University , No. 1630 Dongfang Road, Shanghai 200127, China
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7
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Kohut A, Zholobko O, Hevus I, Voronov A. 1
H NMR Study of “Host-Guest” Interactions of Micellar Assemblies from Amphiphilic Invertible Polymers and Peptides. MACROMOL CHEM PHYS 2017. [DOI: 10.1002/macp.201700344] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Ananiy Kohut
- Department of Organic Chemistry; Lviv Polytechnic National University; vul. S. Bandery 12 Lviv 79013 Ukraine
| | - Oksana Zholobko
- Department of Coatings and Polymeric Materials; North Dakota State University; Department 2760, P.O. Box 6050 Fargo ND 58108-6050 USA
| | - Ivan Hevus
- Department of Coatings and Polymeric Materials; North Dakota State University; Department 2760, P.O. Box 6050 Fargo ND 58108-6050 USA
| | - Andriy Voronov
- Department of Coatings and Polymeric Materials; North Dakota State University; Department 2760, P.O. Box 6050 Fargo ND 58108-6050 USA
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8
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Scharfenberg M, Wald S, Wurm FR, Frey H. Acid-Labile Surfactants Based on Poly(ethylene glycol), Carbon Dioxide and Propylene Oxide: Miniemulsion Polymerization and Degradation Studies. Polymers (Basel) 2017; 9:polym9090422. [PMID: 30965726 PMCID: PMC6419001 DOI: 10.3390/polym9090422] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2017] [Revised: 08/31/2017] [Accepted: 09/01/2017] [Indexed: 12/26/2022] Open
Abstract
Partially degradable, nonionic AB and ABA type di- and triblock copolymers based on poly(propylene carbonate) and poly(ethylene glycol) blocks were synthesized via immortal copolymerization of carbon dioxide and propylene oxide, using mPEG or PEG as a macroinitiator, and (R,R)-(salcy)-CoOBzF₅ as a catalyst in a solvent-free one-pot procedure. The amphiphilic surfactants were prepared with molecular weights (Mn) between 2800 and 10,000 g·mol-¹ with narrow molecular weight distributions (1.03⁻1.09). The copolymers were characterized using ¹H-, 13C- and DOSY-NMR spectroscopy and size exclusion chromatography (SEC). Surface-active properties were determined by surface tension measurements (critical micelle concentration, CMC; CMC range: 1⁻14 mg·mL-¹). Degradation of the acid-labile polycarbonate blocks was investigated in aqueous solution using online ¹H-NMR spectroscopy and SEC. The amphiphilic polymers were used as surfactants in a direct miniemulsion polymerization for poly(styrene) (PS) nanoparticles with mean diameter of 270 to 940 nm. The usage of an acid-triggered precipitation of the emulsion simplified the separation of the particles from the surfactant and purification of the nanoparticles.
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Affiliation(s)
- Markus Scharfenberg
- Institute of Organic Chemistry, Duesbergweg 10-14, Johannes Gutenberg University Mainz, 55128 Mainz, Germany.
| | - Sarah Wald
- Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany.
| | - Frederik R Wurm
- Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany.
| | - Holger Frey
- Institute of Organic Chemistry, Duesbergweg 10-14, Johannes Gutenberg University Mainz, 55128 Mainz, Germany.
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Houdaihed L, Evans JC, Allen C. Overcoming the Road Blocks: Advancement of Block Copolymer Micelles for Cancer Therapy in the Clinic. Mol Pharm 2017; 14:2503-2517. [DOI: 10.1021/acs.molpharmaceut.7b00188] [Citation(s) in RCA: 63] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Loujin Houdaihed
- Department of Pharmaceutical
Sciences, Leslie Dan Faculty of Pharmacy, University of Toronto, Toronto, Ontario, Canada M5S 3M2
| | - James C. Evans
- Department of Pharmaceutical
Sciences, Leslie Dan Faculty of Pharmacy, University of Toronto, Toronto, Ontario, Canada M5S 3M2
| | - Christine Allen
- Department of Pharmaceutical
Sciences, Leslie Dan Faculty of Pharmacy, University of Toronto, Toronto, Ontario, Canada M5S 3M2
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10
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Gharebaghi F, Dalali N, Ahmadi E, Danafar H. Preparation of wormlike polymeric nanoparticles coated with silica for delivery of methotrexate and evaluation of anticancer activity against MCF7 cells. J Biomater Appl 2017; 31:1305-1316. [DOI: 10.1177/0885328217698063] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Methotrexate is one of the most effective drugs that is commonly used in the treatment of cancer. However, its application is limited due to low solubility, high toxicity and rapid metabolism. Therefore, in the present study, worm-like polymeric nanoparticles as carrier of methotrexate were prepared using biodegradable copolymers (mPEG–PCL). The impact of nanoparticles’ geometry on the loading, delivery and drug’s anti-cancer activity was investigated. The di-block copolymer mPEG–PCL was being synthesized by a ring opening polymerization of ɛ-caprolactone in the presence of mPEG as the initiator and Sn(oct)2 as the catalyst. It was used for the preparation of worm-like micelles and coated with silica, so that their structures are stable after drying. The synthesized copolymers and nanoparticles were characterized by FTIR, HNMR, GPC, XRD, TGA, DLS, and FE-SEM analyses. The efficiencies of drug loading and release of nanoparticles as in vitro, was studied by high performance liquid chromatography. The MTT method was used to estimate the toxicity on MCF-7 cell category. The obtained results showed that the nanoparticles were worm-like particles with less than 150 nm diameter and about 1 µm length. The loading and encapsulation efficiencies of drug by the worm-like nanoparticles were 3.5 ± 0.14% and 65.6 ± 0.12%, respectively, while they were obtained as 2.1 ± 0.08% and 26 ± 0.10%, respectively, for spherical nanoparticles. The methotrexate diffusional behavior of worm-like nanoparticles was compared with that of the spherical ones. On the other hand, the anti-cancer activity of MTX-loaded nanoparticles was more than the free drug. The results of the MTT assay showed strong and dose-dependent inhibition of cell (MCF-7 category) growth by the nanoparticles compared with MTX. The inhibitory concentrations (IC50 i.e. reduction viability of cell to 50%) obtained for worm-like, spherical nanoparticles and free drug (incubation times 72 h) were 8.25 ± 0.20, 9.15 ± 0.17, 12.28 ± 0.15 µg/mL, respectively. It can be concluded that application of non-spherical nanoparticles is a better and more effective strategy for controlled and slow release of methotrexate in the treatment of cancer.
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Affiliation(s)
- Farhad Gharebaghi
- Faculty of Science, Phase Separation & FIA Lab., Department of Chemistry, University of Zanjan, Zanjan, Iran
| | - Naser Dalali
- Faculty of Science, Phase Separation & FIA Lab., Department of Chemistry, University of Zanjan, Zanjan, Iran
| | - Ebrahim Ahmadi
- Department of Chemistry, University of Zanjan, Zanjan, Iran
| | - Hossein Danafar
- Cancer Gene Therapy Research Center, Zanjan University of Medical Sciences, Zanjan, Iran
- Zanjan Pharmaceutical Nanotechnology Research Center, Zanjan University of Medical Sciences, Zanjan, Iran
- Department of Pharmaceutical Nanotechnology, School of Pharmacy, Zanjan University of Medical Sciences, Zanjan, Iran
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Chen X, Gu H, Yang J, Wu S, Liu J, Yang X, Chen Q. Controlled PEGylation Crowdedness for Polymeric Micelles To Pursue Ligand-Specified Privileges as Nucleic Acid Delivery Vehicles. ACS APPLIED MATERIALS & INTERFACES 2017; 9:8455-8459. [PMID: 28252934 DOI: 10.1021/acsami.7b01045] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
A facile poly(ethylene glycol) (PEG) detachment scheme was utilized to control the PEGylation degree of the polymeric micelles. The performance of cyclic Arg-Gly-Asp (cRGD) as a targeted moiety was studied on a class of polymeric micelles with various PEGylation degrees, revealing that the specific cRGD-mediated cell affinity, thus the cellular uptake and implicated privileges including the ligand-specified favorable intracellular trafficking and consequent favorable biofunctions, was prominent for the polymeric micelles with high PEGylation degree. These results endow important information and implications for the design and development of targeted nanomedicine, particularly the delivery of vulnerable biological compounds.
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Affiliation(s)
- Xiyi Chen
- School of Public Health, Dalian Medical University , No. 9 West Section, Lvshun South Road, Dalian 116044, China
| | - Haifeng Gu
- College of Science, Dalian Ocean University , No. 52 Heishijiao Street, Dalian 116023, China
| | - Jinjun Yang
- School of Environmental Science and Safety Engineering, Tianjin University of Technology , Xiqing District, Tianjing 300384, China
| | - Sudong Wu
- Ningbo Institute of Materials Technology and Engineering, China Academy of Sciences , Ningbo 315201, China
| | - Jun Liu
- Ningbo Hygeia Medical Technology Company, Ltd. , No. 1177 Lingyun Road, High-Tech Zone, Ningbo 315040, China
| | - Xi Yang
- Department of Neurosurgery, Renji Hospital, Shanghai Jiao Tong University School of Medicine , Shanghai 200127, China
| | - Qixian Chen
- Ningbo Hygeia Medical Technology Company, Ltd. , No. 1177 Lingyun Road, High-Tech Zone, Ningbo 315040, China
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12
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Pucelik B, Gürol I, Ahsen V, Dumoulin F, Dąbrowski JM. Fluorination of phthalocyanine substituents: Improved photoproperties and enhanced photodynamic efficacy after optimal micellar formulations. Eur J Med Chem 2016; 124:284-298. [PMID: 27597406 DOI: 10.1016/j.ejmech.2016.08.035] [Citation(s) in RCA: 57] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2016] [Revised: 08/16/2016] [Accepted: 08/17/2016] [Indexed: 11/19/2022]
Abstract
A fluorinated phthalocyanine and its non-fluorinated analogue were selected to evaluate the potential enhancement of fluorination on photophysical, photochemical and redox properties as well as on biological activity in cellular and animal models. Due to the pharmacological relevance, the affinity of these phthalocyanines towards biological membranes (logPow) as well as their primary interaction with human serum albumin (HSA) or low-density lipoprotein (LDL) were determined. Water-dispersible drug formulation of phthalocyanines via Pluronic®-based triblock copolymer micelles was prepared to avoid self-aggregation effects and to improve their delivery. The obtained results demonstrate that phthalocyanines incorporation into tunable-polymeric micelles significantly enhanced their cellular uptake and their photocytotoxicity. The improved biodistribution and photodynamic efficacy of the phthalocyanines-triblock copolymer conjugates was also confirmed in vivo in CT26 bearing BALB/c mice. PDT with both compounds led to tumor growth inhibition in all treated animals. Fluorinated phthalocyanine 2 turned out to be the most effective anticancer agent as the tumors of 20% of mice treated regressed completely and did not appear for over one year after treatment.
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Affiliation(s)
- Barbara Pucelik
- Faculty of Chemistry, Jagiellonian University, 30-060 Kraków, Poland
| | - Ilke Gürol
- TÜBITAK Marmara Research Center, Materials Institute, P.O. Box 21, 41470 Gebze, Kocaeli, Turkey
| | - Vefa Ahsen
- Gebze Technical University, Department of Chemistry, P.O. Box 141, 41400 Gebze, Kocaeli, Turkey
| | - Fabienne Dumoulin
- Gebze Technical University, Department of Chemistry, P.O. Box 141, 41400 Gebze, Kocaeli, Turkey.
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Abstract
Research in the field of nonviral gene delivery is in the initial stages relative to the more commonly known viral systems. However, nonviral systems may, in the near future overcome some of the problems inherent to currently employed viral gene delivery systems. These problems range from limited payload capacity and general production issues to immune and toxic reactions, as well as the potential for catastrophic viral recombination. Self-assembling complexes of nucleic acids and synthetic polymers, commonly referred to as `polyplexes', are formed as the result of electrostatic interactions between the negatively charged phosphate groups of the DNA and the positively charged groups of the polycation. A wide array of polycations are available for such studies, including those with linear, branched, dendritic and block or graft copolymer architectures. These polycations vary greatly in chemical composition as well as the number of repeating units, providing for a wide range of different polyplexes that can be easily assembled. Some of the current gene delivery systems are described which serve as potential reagents in the field of polymer-based gene delivery.
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Affiliation(s)
- Catherine L. Gebhart
- Department of Pharmaceutical Sciences College of Pharmacy University of Nebraska Medical Center 986025, Nebraska Medical Center Omaha, NE 68198-6025, USA
| | - Alexander V. Kabanov
- Department of Pharmaceutical Sciences College of Pharmacy University of Nebraska Medical Center 986025, Nebraska Medical Center Omaha, NE 68198-6025, USA
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Curcumin and Osteosarcoma: Can Invertible Polymeric Micelles Help? MATERIALS 2016; 9:ma9070520. [PMID: 28773642 PMCID: PMC5456898 DOI: 10.3390/ma9070520] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/17/2016] [Revised: 06/21/2016] [Accepted: 06/23/2016] [Indexed: 12/16/2022]
Abstract
Systematic review of experimental and clinical data on the use of curcumin in the treatment of osteosarcoma is presented. The current status of curcumin's therapeutic potential against bone cancer is analyzed in regard to using polymeric micelles (including recently developed invertible, responsive, micelles) as a platform for curcumin delivery to treat osteosarcoma. The potential of micellar assemblies from responsive macromolecules in a controlled delivery of curcumin to osteosarcoma cells, and the release using a new inversion mechanism is revealed.
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Hädicke A, Blume A. Interactions of Pluronic block copolymers with lipid vesicles depend on lipid phase and Pluronic aggregation state. Colloid Polym Sci 2014. [DOI: 10.1007/s00396-014-3414-6] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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16
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Torcello-Gómez A, Wulff-Pérez M, Gálvez-Ruiz MJ, Martín-Rodríguez A, Cabrerizo-Vílchez M, Maldonado-Valderrama J. Block copolymers at interfaces: interactions with physiological media. Adv Colloid Interface Sci 2014; 206:414-27. [PMID: 24268588 DOI: 10.1016/j.cis.2013.10.027] [Citation(s) in RCA: 53] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2013] [Revised: 10/23/2013] [Accepted: 10/23/2013] [Indexed: 12/20/2022]
Abstract
Triblock copolymers (also known as Pluronics or poloxamers) are biocompatible molecules composed of hydrophobic and hydrophilic blocks with different lengths. They have received much attention recently owing to their applicability for targeted delivery of hydrophobic compounds. Their unique molecular structure facilitates the formation of dynamic aggregates which are able to transport lipid soluble compounds. However, these structures can be unstable and tend to solubilize within the blood stream. The use of nanoemulsions as carriers for the lipid soluble compounds appears as a new alternative with improved protection against physiological media. The interfacial behavior of block copolymers is directly related to their peculiar molecular structure and further knowledge could provide a rational use in the design of poloxamer-stabilized nanoemulsions. This review aims to combine the new insights gained recently into the interfacial properties of block copolymers and their performance in nanoemulsions. Direct studies dealing with the interactions with physiological media are also reviewed in order to address issues relating metabolism degradation profiles. A better understanding of the physico-chemical and interfacial properties of block copolymers will allow their manipulation to modulate lipolysis, hence allowing the rational design of nanocarriers with efficient controlled release.
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Abstract
Though much progress has been made in drug delivery systems, the design of a suitable carrier for the delivery of hydrophobic drugs is still a major challenge for researchers.
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Affiliation(s)
- Zaheer Ahmad
- Department of Chemistry
- Quaid-i-Azam University
- Islamabad, Pakistan
| | - Afzal Shah
- Department of Chemistry
- Quaid-i-Azam University
- Islamabad, Pakistan
- Department of Physical and Environmental Sciences
- University of Toronto
| | - Muhammad Siddiq
- Department of Chemistry
- Quaid-i-Azam University
- Islamabad, Pakistan
| | - Heinz-Bernhard Kraatz
- Department of Physical and Environmental Sciences
- University of Toronto
- Toronto, Canada
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18
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De Nicola A, Hezaveh S, Zhao Y, Kawakatsu T, Roccatano D, Milano G. Micellar drug nanocarriers and biomembranes: how do they interact? Phys Chem Chem Phys 2014; 16:5093-105. [DOI: 10.1039/c3cp54242d] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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19
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Park H, Na K. Conjugation of the photosensitizer Chlorin e6 to pluronic F127 for enhanced cellular internalization for photodynamic therapy. Biomaterials 2013; 34:6992-7000. [DOI: 10.1016/j.biomaterials.2013.05.070] [Citation(s) in RCA: 108] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2013] [Accepted: 05/25/2013] [Indexed: 02/08/2023]
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20
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Tockary TA, Osada K, Chen Q, Machitani K, Dirisala A, Uchida S, Nomoto T, Toh K, Matsumoto Y, Itaka K, Nitta K, Nagayama K, Kataoka K. Tethered PEG Crowdedness Determining Shape and Blood Circulation Profile of Polyplex Micelle Gene Carriers. Macromolecules 2013. [DOI: 10.1021/ma401093z] [Citation(s) in RCA: 89] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Affiliation(s)
| | - Kensuke Osada
- Japan Science and Technology
Agency, PRESTO, 4-1-8 Honcho, Kawaguchi, Saitama 332-0012, Japan
| | | | | | | | | | | | | | | | | | - Koji Nitta
- Okazaki Institute for Integrative
Bioscience, National Institutes of Natural Sciences, 5-1 Higashiyama, Myodaijicho, Okazaki, Aichi 444-8787, Japan
| | - Kuniaki Nagayama
- Okazaki Institute for Integrative
Bioscience, National Institutes of Natural Sciences, 5-1 Higashiyama, Myodaijicho, Okazaki, Aichi 444-8787, Japan
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21
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Hädicke A, Blume A. Interactions of Pluronic block copolymers with lipid monolayers studied by epi-fluorescence microscopy and by adsorption experiments. J Colloid Interface Sci 2013; 407:327-38. [PMID: 23859816 DOI: 10.1016/j.jcis.2013.06.041] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2013] [Revised: 06/12/2013] [Accepted: 06/13/2013] [Indexed: 10/26/2022]
Abstract
The interactions of poly(ethylene oxide)-poly(propylene oxide)-poly(ethylene oxide) (PEO-PPO-PEO) triblock copolymers, i.e. Pluronics F87, F88 and F127, with monolayers composed of 1,2-dipalmitoyl-sn-glycero-3-phosphocholine (DPPC) and 1-palmitoyl-2-oleoyl-sn-glycero-3-phosphocholine (POPC) were investigated with different monolayer techniques. Surface pressure-area isotherms were recorded of co-spread Pluronic/lipid mixtures with different Pluronic content to determine the influence of the polymers on the monolayer phase transitions. The squeeze-out pressure of the polymers upon film compression was dependent on the PPO block length. The monolayer compression experiments were coupled with fluorescence microscopy to visualize the phase separation into polymer-rich and lipid-rich domains and to monitor morphological changes of the lipid domains in the monolayer. Extensive phase separation was observed in the coexistence region between liquid-expanded (LE) and liquid-condensed (LC) lipid phases, where pure polymer domains coexisting with round LE-domains containing polymer, and polymer-free LC-domains were seen. We also investigated the adsorption of Pluronics to a lipid monolayer after injecting a polymer solution underneath a pre-formed lipid monolayer by following the change in pressure at constant area. The results show that polymer adsorption is a superposition of two individual processes with different kinetics. Pluronics with a higher hydrophobicity and with a smaller molecular weight adsorb faster and the type and phase state of the lipid determines the surface pressure where no further Pluronic molecules adsorb to the interface. This critical surface pressure depends on the PPO block length, whereas the strength of the interaction with the lipids is determined by the relative PEO content. This indicates that also interactions between the PEO blocks and the lipid headgroup region are occurring. The interactions with the unsaturated lipid POPC in the liquid-expanded phase turn out to be stronger than for lipids in the liquid-condensed phase, where the polymers are excluded.
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Affiliation(s)
- André Hädicke
- Institute of Chemistry, Martin-Luther-University Halle-Wittenberg, von-Danckelmann-Platz 4, 06120 Halle/Saale, Germany
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22
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Surface modification with pluronic P123 enhances transfection efficiency of PAMAM dendrimer. Macromol Res 2011. [DOI: 10.1007/s13233-012-0031-4] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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23
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Kulthe S, Inamdar N, Choudhari Y, Shirolikar S, Borde L, Mourya V. Mixed micelle formation with hydrophobic and hydrophilic Pluronic block copolymers: Implications for controlled and targeted drug delivery. Colloids Surf B Biointerfaces 2011; 88:691-6. [DOI: 10.1016/j.colsurfb.2011.08.002] [Citation(s) in RCA: 103] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2011] [Revised: 08/01/2011] [Accepted: 08/02/2011] [Indexed: 10/17/2022]
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24
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Paolino D, Cosco D, Molinaro R, Celia C, Fresta M. Supramolecular devices to improve the treatment of brain diseases. Drug Discov Today 2011; 16:311-24. [DOI: 10.1016/j.drudis.2011.02.006] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2010] [Revised: 01/05/2011] [Accepted: 02/08/2011] [Indexed: 01/03/2023]
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25
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Morille M, Passirani C, Dufort S, Bastiat G, Pitard B, Coll JL, Benoit JP. Tumor transfection after systemic injection of DNA lipid nanocapsules. Biomaterials 2011; 32:2327-33. [DOI: 10.1016/j.biomaterials.2010.11.063] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2010] [Accepted: 11/26/2010] [Indexed: 10/18/2022]
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26
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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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27
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Chou FF, Huang SC, Chang SF, Liaw J, Hung PH. Oral gene therapy for hypoparathyroidism: a rat model. Hum Gene Ther 2010; 20:1344-50. [PMID: 19619000 DOI: 10.1089/hum.2009.015] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
The use of nonionic polymeric micelles orally to protect and deliver plasmid DNA in vivo was investigated. Parathyroid hormone (PTH)(1-34) gene (179 bp) was inserted into a human cytomegalovirus promoter (PCMV) and E. coli competent cells were used to amplify the cDNA. Polymeric micelle formations (100 microl) formed from PCMV-PTH(1-34) cDNA (7.2 microg/microl) and 6% (w/v) polyethylene oxide-polypropylene oxide-polyethylene oxide (PEO-PPO-PEO) was administered at 8-hr intervals for 48 hr and then at 8-hr intervals for 24 hr weekly for 3 weeks. Parathyroidectomized rats receiving 150 microl of EDTA (10 mM) before each dose of formation served as the study group; rats receiving drinking water, EDTA (10 mM), PCMV-PTH(1-34) cDNA and PCMV-PTH(1-34) cDNA plus EDTA at the same amount and time intervals served as the control groups. Serum levels of calcium and PTH(1-34) were measured weekly for 4 weeks. Immunohistochemical stain for PTH(1-34), reverse transcriptase polymerase chain reaction for PTH(1-34) mRNA and the relative density of PTH(1-34) mRNA were performed at 2 and 4 weeks after oral gene therapy in different organs. One third to three of five rats in the control groups died after parathyroidectomy. Serum levels of calcium and PTH(1-34) were higher in the study than in the control groups. In the study group, positive stain of PTH(1-34) and PTH(1-34) mRNA could be found in those organs. Relative densities of PTH(1-34) mRNA were higher in the study than in the drinking water group in different organs. Oral gene therapy can maintain calcium and PTH(1-34) levels in parathyroidectomized rats.
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Affiliation(s)
- Fong-Fu Chou
- Department of Surgery, Chang Gung Memorial Hospital-Kaohsiung Medical Center, Chang Gung University College of Medicine, Niao-Sung Hsiang, Kaohsiung Hsien, Taiwan
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28
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Lee ES, Oh YT, Youn YS, Nam M, Park B, Yun J, Kim JH, Song HT, Oh KT. Binary mixing of micelles using Pluronics for a nano-sized drug delivery system. Colloids Surf B Biointerfaces 2010; 82:190-5. [PMID: 20850281 DOI: 10.1016/j.colsurfb.2010.08.033] [Citation(s) in RCA: 95] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2010] [Revised: 08/12/2010] [Accepted: 08/23/2010] [Indexed: 11/29/2022]
Abstract
Pluronics with different structural compositions and properties are used for several applications, including drug delivery systems. We developed a binary mixing system with two Pluronics, L121/P123, as a nano-sized drug delivery carrier. The lamellar-forming Pluronic L121 (0.1 wt%) was incorporated with Pluronic P123 to produce nano-sized dispersions (in case of 0.1 and 0.5 wt% P123) with high stability due to Pluronic P123 and high solubilization capacity due to Pluronic L121. The binary systems were spherical and less than 200-nm diameter, with high thermodynamic stability (at least 2 weeks) in aqueous solution. The CMC of the binary system was located in the middle of the CMC of each polymer. In particular, the solubilization capacity of the binary system (0.1/0.1 wt%) was higher than mono-systems of P123. The main advantage of binary systems is overcoming limitations of mono systems to allow tailored mixing of block copolymers with different physicochemical characteristics. These nano-sized systems may have potential as anticancer drug delivery systems with simple preparation method, high stability, and high loading capacity.
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Affiliation(s)
- Eun Seong Lee
- Division of Biotechnology, The Catholic University of Korea, 43-1 Yeokgok 2-dong, Wonmi-gu, Bucheon-si, Gyeonggi-do 420-743, Republic of Korea
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29
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Censi R, Vermonden T, Deschout H, Braeckmans K, di Martino P, De Smedt SC, van Nostrum CF, Hennink WE. Photopolymerized Thermosensitive Poly(HPMAlactate)-PEG-Based Hydrogels: Effect of Network Design on Mechanical Properties, Degradation, and Release Behavior. Biomacromolecules 2010; 11:2143-51. [DOI: 10.1021/bm100514p] [Citation(s) in RCA: 48] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Roberta Censi
- Department of Pharmaceutics, Utrecht Institute for Pharmaceutical Sciences (UIPS), Utrecht University, P.O. Box 80082, 3508 TB Utrecht, The Netherlands, Department of Chemical Sciences, Camerino University, via S, Agostino 1, 62032, Camerino (MC), Italy, and Laboratory of General Biochemistry and Physical Chemistry, Department of Pharmaceutics, Ghent University, Harelbekestraat 72, B-9000, Ghent, Belgium
| | - Tina Vermonden
- Department of Pharmaceutics, Utrecht Institute for Pharmaceutical Sciences (UIPS), Utrecht University, P.O. Box 80082, 3508 TB Utrecht, The Netherlands, Department of Chemical Sciences, Camerino University, via S, Agostino 1, 62032, Camerino (MC), Italy, and Laboratory of General Biochemistry and Physical Chemistry, Department of Pharmaceutics, Ghent University, Harelbekestraat 72, B-9000, Ghent, Belgium
| | - Hendrik Deschout
- Department of Pharmaceutics, Utrecht Institute for Pharmaceutical Sciences (UIPS), Utrecht University, P.O. Box 80082, 3508 TB Utrecht, The Netherlands, Department of Chemical Sciences, Camerino University, via S, Agostino 1, 62032, Camerino (MC), Italy, and Laboratory of General Biochemistry and Physical Chemistry, Department of Pharmaceutics, Ghent University, Harelbekestraat 72, B-9000, Ghent, Belgium
| | - Kevin Braeckmans
- Department of Pharmaceutics, Utrecht Institute for Pharmaceutical Sciences (UIPS), Utrecht University, P.O. Box 80082, 3508 TB Utrecht, The Netherlands, Department of Chemical Sciences, Camerino University, via S, Agostino 1, 62032, Camerino (MC), Italy, and Laboratory of General Biochemistry and Physical Chemistry, Department of Pharmaceutics, Ghent University, Harelbekestraat 72, B-9000, Ghent, Belgium
| | - Piera di Martino
- Department of Pharmaceutics, Utrecht Institute for Pharmaceutical Sciences (UIPS), Utrecht University, P.O. Box 80082, 3508 TB Utrecht, The Netherlands, Department of Chemical Sciences, Camerino University, via S, Agostino 1, 62032, Camerino (MC), Italy, and Laboratory of General Biochemistry and Physical Chemistry, Department of Pharmaceutics, Ghent University, Harelbekestraat 72, B-9000, Ghent, Belgium
| | - Stefaan C. De Smedt
- Department of Pharmaceutics, Utrecht Institute for Pharmaceutical Sciences (UIPS), Utrecht University, P.O. Box 80082, 3508 TB Utrecht, The Netherlands, Department of Chemical Sciences, Camerino University, via S, Agostino 1, 62032, Camerino (MC), Italy, and Laboratory of General Biochemistry and Physical Chemistry, Department of Pharmaceutics, Ghent University, Harelbekestraat 72, B-9000, Ghent, Belgium
| | - Cornelus F. van Nostrum
- Department of Pharmaceutics, Utrecht Institute for Pharmaceutical Sciences (UIPS), Utrecht University, P.O. Box 80082, 3508 TB Utrecht, The Netherlands, Department of Chemical Sciences, Camerino University, via S, Agostino 1, 62032, Camerino (MC), Italy, and Laboratory of General Biochemistry and Physical Chemistry, Department of Pharmaceutics, Ghent University, Harelbekestraat 72, B-9000, Ghent, Belgium
| | - Wim E. Hennink
- Department of Pharmaceutics, Utrecht Institute for Pharmaceutical Sciences (UIPS), Utrecht University, P.O. Box 80082, 3508 TB Utrecht, The Netherlands, Department of Chemical Sciences, Camerino University, via S, Agostino 1, 62032, Camerino (MC), Italy, and Laboratory of General Biochemistry and Physical Chemistry, Department of Pharmaceutics, Ghent University, Harelbekestraat 72, B-9000, Ghent, Belgium
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30
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Xiong YC, Yao YC, Zhan XY, Chen GQ. Application of polyhydroxyalkanoates nanoparticles as intracellular sustained drug-release vectors. JOURNAL OF BIOMATERIALS SCIENCE-POLYMER EDITION 2010; 21:127-40. [PMID: 20040158 DOI: 10.1163/156856209x410283] [Citation(s) in RCA: 99] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Polyhydroxybutyrate (PHB), co-polyesters of 3-hydroxybutyrate and 3-hydroxyhexanoate (PHBHHx), and polylactic acid (PLA) were used to prepare nanoparticles with average sizes of 160, 250 and 150 nm, respectively. A lipid-soluble colorant, rhodamine B isothiocyanate (RBITC), was employed to study drug-release behaviors from these nanoparticles. A high RBITC drug-loading efficiency of over 75% was achieved with all PHA nanoparticles prepared. Macrophage endocytosis led to an intracellular RBITC drug sustained release over a period of at least 20 days for PHB and PHBHHx nanoparticles, while PLA nanoparticles and free drug lasted only 15 days and a week, respectively. Polymer properties and particle sizes showed little effect on drug-release behavior. This study showed for the first time that PHB and PHBHHx can be used effectively to achieve intracellular controlled drug releases.
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Affiliation(s)
- Yu-Cui Xiong
- Multidisciplinary Research Center, Shantou University, Shantou 515063, Guangdong, P. R. China
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31
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Singh PK, Kumbhakar M, Ganguly R, Aswal VK, Pal H, Nath S. Time-Resolved Fluorescence and Small Angle Neutron Scattering Study in Pluronics−Surfactant Supramolecular Assemblies. J Phys Chem B 2010; 114:3818-26. [DOI: 10.1021/jp909333q] [Citation(s) in RCA: 49] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Affiliation(s)
- Prabhat K. Singh
- Radiation & Photochemistry Division, Chemistry Division, and Solid State Physics Division, Bhabha Atomic Research Centre, Mumbai 400 085, India
| | - Manoj Kumbhakar
- Radiation & Photochemistry Division, Chemistry Division, and Solid State Physics Division, Bhabha Atomic Research Centre, Mumbai 400 085, India
| | - Rajib Ganguly
- Radiation & Photochemistry Division, Chemistry Division, and Solid State Physics Division, Bhabha Atomic Research Centre, Mumbai 400 085, India
| | - Vinod K. Aswal
- Radiation & Photochemistry Division, Chemistry Division, and Solid State Physics Division, Bhabha Atomic Research Centre, Mumbai 400 085, India
| | - Haridas Pal
- Radiation & Photochemistry Division, Chemistry Division, and Solid State Physics Division, Bhabha Atomic Research Centre, Mumbai 400 085, India
| | - Sukhendu Nath
- Radiation & Photochemistry Division, Chemistry Division, and Solid State Physics Division, Bhabha Atomic Research Centre, Mumbai 400 085, India
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32
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Solution microstructures of the micellar phase of Pluronic L64/SDS/water system. J Colloid Interface Sci 2010; 342:348-53. [DOI: 10.1016/j.jcis.2009.10.069] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2009] [Revised: 10/27/2009] [Accepted: 10/27/2009] [Indexed: 11/22/2022]
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33
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Shaik N, Giri N, Elmquist WF. Investigation of the micellar effect of pluronic P85 on P-glycoprotein inhibition: cell accumulation and equilibrium dialysis studies. J Pharm Sci 2010; 98:4170-90. [PMID: 19283769 DOI: 10.1002/jps.21723] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
The objective of this study was: (1) to characterize the P-gp inhibitory effect of different concentrations of Pluronic P85 on anti-HIV-1 drug cellular accumulation, and (2) to investigate the relationship between cellular accumulation and free fraction of drug. Cellular accumulation studies in MDCKII-WT and MDCKII-MDR1 cell monolayers showed a biphasic dose response characterized by decline in accumulation at Pluronic concentrations greater than the CMC. This phenomenon was independent of the inhibition of P-gp efflux by Pluronic. Cell-free equilibrium dialysis was used to determine the effect of Pluronic P85 on drug free fraction and the affinity of Pluronic micelles for drug was modeled. Nelfinavir and saquinavir associated extensively with micelles and equilibrium free fractions were low at P85 concentrations above the CMC, with association constants being in the order nelfinavir > saquinavir >>> abacavir. Abacavir, a P-gp substrate, showed no association with micelles yet showed a biphasic response in cellular accumulation. These data suggest that, above the CMC, inhibition of P-gp is not affected but rather factors such as micellar trapping could contribute to decreased accumulation. Therefore, the in vitro evaluation of the effect of Pluronic formulations on active transport should take into account both the physicochemical properties of drug and the composition of Pluronic.
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Affiliation(s)
- Naveed Shaik
- Department of Pharmaceutics, College of Pharmacy, University of Minnesota, 308 Harvard St. SE, Minneapolis, Minnesota 55455, USA
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34
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Morille M, Passirani C, Letrou-Bonneval E, Benoit JP, Pitard B. Galactosylated DNA lipid nanocapsules for efficient hepatocyte targeting. Int J Pharm 2009; 379:293-300. [DOI: 10.1016/j.ijpharm.2009.05.065] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2009] [Revised: 05/15/2009] [Accepted: 05/28/2009] [Indexed: 10/20/2022]
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35
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Hao J, Sha X, Tang Y, Jiang Y, Zhang Z, Zhang W, Li Y, Fang X. Enhanced transfection of polyplexes based on pluronic-polypropylenimine dendrimer for gene transfer. Arch Pharm Res 2009; 32:1045-54. [DOI: 10.1007/s12272-009-1710-3] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2009] [Revised: 06/17/2009] [Accepted: 06/30/2009] [Indexed: 11/29/2022]
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36
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Singh PK, Kumbhakar M, Pal H, Nath S. Modulation in the Solute Location in Block Copolymer−Surfactant Supramolecular Assembly: A Time-resolved Fluorescence Study. J Phys Chem B 2009; 113:1353-9. [DOI: 10.1021/jp808123m] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Affiliation(s)
- Prabhat K. Singh
- Radiation and Photochemistry Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400 085, India
| | - Manoj Kumbhakar
- Radiation and Photochemistry Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400 085, India
| | - Haridas Pal
- Radiation and Photochemistry Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400 085, India
| | - Sukhendu Nath
- Radiation and Photochemistry Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400 085, India
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37
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A specific drug targeting system based on polyhydroxyalkanoate granule binding protein PhaP fused with targeted cell ligands. Biomaterials 2008; 29:4823-30. [DOI: 10.1016/j.biomaterials.2008.09.008] [Citation(s) in RCA: 116] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2008] [Accepted: 09/02/2008] [Indexed: 12/16/2022]
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38
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Savić R, Eisenberg A, Maysinger D. Block copolymer micelles as delivery vehicles of hydrophobic drugs: Micelle–cell interactions. J Drug Target 2008; 14:343-55. [PMID: 17092835 DOI: 10.1080/10611860600874538] [Citation(s) in RCA: 154] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
One-third of drugs in development are water insoluble and one-half fail in trials because of poor pharmacokinetics. Block copolymer micelles are nanosized particles that can solubilize hydrophobic drugs and alter their kinetics in vitro and in vivo. However, block copolymer micelles are not solely passive drug containers that simply solubilize hydrophobic drugs; cells internalize micelles. To facilitate the development of advanced, controlled, micellar drug delivery vehicles, we have to understand the fate of micelles and micelle-incorporated drugs in cells and in vivo. With micelle-based drug formulations recently reaching clinical trials, the impetus for answers is ever so strong and detailed studies of interactions of micelles and cells are starting to emerge. Most notably, the question arises: Is the internalization of block copolymer micelles carrying small molecular weight drugs an undesired side effect or a useful means of improving the effectiveness of the incorporated drugs?
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Affiliation(s)
- Radoslav Savić
- Department of Pharmacology & Therapeutics, McGill University, Montreal, Quebec, Canada
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39
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Singh PK, Kumbhakar M, Pal H, Nath S. Effect of Electrostatic Interaction on the Location of Molecular Probe in Polymer−Surfactant Supramolecular Assembly: A Solvent Relaxation Study. J Phys Chem B 2008; 112:7771-7. [DOI: 10.1021/jp800701v] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Prabhat K. Singh
- Radiation and Photochemistry Division, Bhabha Atomic Research Centre, Mumbai 400 085, India
| | - Manoj Kumbhakar
- Radiation and Photochemistry Division, Bhabha Atomic Research Centre, Mumbai 400 085, India
| | - Haridas Pal
- Radiation and Photochemistry Division, Bhabha Atomic Research Centre, Mumbai 400 085, India
| | - Sukhendu Nath
- Radiation and Photochemistry Division, Bhabha Atomic Research Centre, Mumbai 400 085, India
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40
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Verma P, Nath S, Singh PK, Kumbhakar M, Pal H. Effects of Block Size of Pluronic Polymers on the Water Structure in the Corona Region and Its Effect on the Electron Transfer Reactions. J Phys Chem B 2008; 112:6363-72. [DOI: 10.1021/jp711642x] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Affiliation(s)
- Poonam Verma
- Radioanalytical Chemistry Section and Radiation & Photochemistry Division, Bhabha Atomic Research Centre, Mumbai 400 085, India
| | - Sukhendu Nath
- Radioanalytical Chemistry Section and Radiation & Photochemistry Division, Bhabha Atomic Research Centre, Mumbai 400 085, India
| | - Prabhat K. Singh
- Radioanalytical Chemistry Section and Radiation & Photochemistry Division, Bhabha Atomic Research Centre, Mumbai 400 085, India
| | - Manoj Kumbhakar
- Radioanalytical Chemistry Section and Radiation & Photochemistry Division, Bhabha Atomic Research Centre, Mumbai 400 085, India
| | - Haridas Pal
- Radioanalytical Chemistry Section and Radiation & Photochemistry Division, Bhabha Atomic Research Centre, Mumbai 400 085, India
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41
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Pan H, Kopecek J. Multifunctional Water-Soluble Polymers for Drug Delivery. MULTIFUNCTIONAL PHARMACEUTICAL NANOCARRIERS 2008. [DOI: 10.1007/978-0-387-76554-9_4] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
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Simone EA, Dziubla TD, Colon-Gonzalez F, Discher DE, Muzykantov VR. Effect of polymer amphiphilicity on loading of a therapeutic enzyme into protective filamentous and spherical polymer nanocarriers. Biomacromolecules 2007; 8:3914-21. [PMID: 18038999 DOI: 10.1021/bm700888h] [Citation(s) in RCA: 48] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Rapid clearance and proteolysis limit delivery and efficacy of protein therapeutics. Loading into biodegradable polymer nanocarriers (PNC) might protect proteins, extending therapeutic duration, but loading can be complicated by protein unfolding and inactivation. We encapsulated active enzymes into methoxy-poly(ethylene glycol- block-lactic acid) (mPEG-PLA) PNC with a freeze-thaw double emulsion ( J. Controlled Release 2005, 102 (2), 427-439). On the basis of concepts of amphiphile self-assembly, we hypothesized that the copolymer block ratio that controls spontaneous curvature would influence PNC morphology and loading. We examined PNC yield, shape, stability, loading, activity, and protease resistance of the antioxidant enzyme, catalase. PNC transitioned from spherical to filamentous shapes with increasing hydrophobic polymer fraction, consistent with trends for self-assembly of lower MW amphiphiles. Importantly, one diblock copolymer formed filamentous particles loaded with significant levels of protease-resistant enzyme, demonstrating for the first time encapsulation of an active therapeutic enzyme into filamentous carriers. PNC morphology also greatly influenced its degradation, offering a new means of controlled delivery.
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Affiliation(s)
- Eric A Simone
- Department of Bioengineering, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA.
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43
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Pharmaceutical evaluation of genistein-loaded pluronic micelles for oral delivery. Arch Pharm Res 2007; 30:1138-43. [DOI: 10.1007/bf02980249] [Citation(s) in RCA: 62] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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44
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Khalid Hossain M, Hinata S, Lopez‐Quintela A, Kunieda H. Phase Behavior of Poly(Oxyethylene)–Poly(Oxypropylene)–Poly(Oxyethylene) Block Copolymer in Water and Water–C12EO5 Systems. J DISPER SCI TECHNOL 2007. [DOI: 10.1081/dis-120021798] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Affiliation(s)
- Md. Khalid Hossain
- a Graduate School of Environment and Information Sciences , Yokohama National University , 79‐7 Tokiwadai, Hodogaya‐ku , Yokohama , 240‐8501 , Japan
| | - Shigeki Hinata
- a Graduate School of Environment and Information Sciences , Yokohama National University , 79‐7 Tokiwadai, Hodogaya‐ku , Yokohama , 240‐8501 , Japan
| | - Arturo Lopez‐Quintela
- b Department of Physical Chemistry , University of Santiago Compostela , Santiago de Compostela , Spain
| | - Hironobu Kunieda
- a Graduate School of Environment and Information Sciences , Yokohama National University , 79‐7 Tokiwadai, Hodogaya‐ku , Yokohama , 240‐8501 , Japan
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45
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Torchilin VP. Micellar nanocarriers: pharmaceutical perspectives. Pharm Res 2006; 24:1-16. [PMID: 17109211 DOI: 10.1007/s11095-006-9132-0] [Citation(s) in RCA: 1228] [Impact Index Per Article: 68.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2006] [Accepted: 07/20/2006] [Indexed: 12/22/2022]
Abstract
Micelles, self-assembling nanosized colloidal particles with a hydrophobic core and hydrophilic shell are currently successfully used as pharmaceutical carriers for water-insoluble drugs and demonstrate a series of attractive properties as drug carriers. Among the micelle-forming compounds, amphiphilic copolymers, i.e., polymers consisting of hydrophobic block and hydrophilic block, are gaining an increasing attention. Polymeric micelles possess high stability both in vitro and in vivo and good biocompatibility, and can solubilize a broad variety of poorly soluble pharmaceuticals many of these drug-loaded micelles are currently at different stages of preclinical and clinical trials. Among polymeric micelles, a special group is formed by lipid-core micelles, i.e., micelles formed by conjugates of soluble copolymers with lipids (such as polyethylene glycol-phosphatidyl ethanolamine conjugate, PEG-PE). Polymeric micelles, including lipid-core micelles, carrying various reporter (contrast) groups may become the imaging agents of choice in different imaging modalities. All these micelles can also be used as targeted drug delivery systems. The targeting can be achieved via the enhanced permeability and retention (EPR) effect (into the areas with the compromised vasculature), by making micelles of stimuli-responsive amphiphilic block-copolymers, or by attaching specific targeting ligand molecules to the micelle surface. Immunomicelles prepared by coupling monoclonal antibody molecules to p-nitrophenylcarbonyl groups on the water-exposed termini of the micelle corona-forming blocks demonstrate high binding specificity and targetability. This review will discuss some recent trends in using micelles as pharmaceutical carriers.
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Affiliation(s)
- V P Torchilin
- Department of Pharmaceutical Sciences and Center for Pharmaceutical Biotechnology and Nanomedicine, Northeastern University, Mugar Building, Room 312, 360 Huntington Avenue, Boston, Massachusetts 02115, USA.
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46
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Nour El-Din ANM, Shkreta L, Talbot BG, Diarra MS, Lacasse P. DNA immunization of dairy cows with the clumping factor A of Staphylococcus aureus. Vaccine 2005; 24:1997-2006. [PMID: 16426711 DOI: 10.1016/j.vaccine.2005.11.033] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2005] [Revised: 11/15/2005] [Accepted: 11/16/2005] [Indexed: 11/27/2022]
Abstract
Blocking the primary stages of Staphylococcus aureus infection, specifically the bacterial adhesion to cell and the colonization of the mucosal surface, may be the most effective strategy for preventing infections. Clumping factor A (ClfA) is considered to be one of the most important adhesions factors of S. aureus to host cells. The present study describes the immune response of dairy cattle to a DNA vaccine against ClfA and evaluates the ability of specific genetic adjuvants, targeting sequences (granulocyte macrophage colony-stimulating factor and cytotoxic T lymphocyte antigen-4) and transporter molecules (chitosan and copolymer) to modify the immune response of cows. The results show that vaccination of cows with fibrinogen-binding region A induced a strong and specific antibody response to ClfA in comparison with a control group injected with the pCI vector alone. Although the co-expression of both genetic adjuvants and the addition copolymer transporter did not augment the overall antibody response, these approaches decreased the number of non-responsive cows. Chitosan was the only factor that did not enhance the immune response. Three months after the last DNA immunization, three cows from each of the pGM-CSF, internal ribosomal entry site (IRES), pCTLA and pCI groups were injected with 200 microg of recombinant ClfA protein in incomplete Freund's adjuvant. A strong humoral response was observed in all groups following this protein boost, with the response occurring slightly earlier in DNA-primed protein boost cows. Sera and milk samples taken from cows after the second DNA injection or after the protein boost (sera only) were analyzed for their ability to block adherence and increase phagocytosis. Pre-incubation of S. aureus with sera or milk from vaccinated cows significantly reduced the pathogen's ability to adhere to MAC-T cells relative to the sera and milk samples from the pCI-injected control cows. Similarly, pools of sera and milk from vaccinated cows increased phagocytosis of S. aureus by neutrophils. After the protein boost, sera were more efficient promoters of phagocytosis, reflecting the higher anti-ClfA antibody level of these sera. DNA-prime/protein boost regimes combined with molecular adjuvants appeared to be effective in generating a strong immune response to S. aureus antigens in cattle.
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Affiliation(s)
- Adel N M Nour El-Din
- Department of Animal Production, Faculty of Agriculture (El-Shatby), Alexandria University, Egypt
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47
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Motokawa R, Morishita K, Koizumi S, Nakahira T, Annaka M. Thermosensitive Diblock Copolymer of Poly(N-isopropylacrylamide) and Poly(ethylene glycol) in Water: Polymer Preparation and Solution Behavior. Macromolecules 2005. [DOI: 10.1021/ma047393x] [Citation(s) in RCA: 129] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Ryuhei Motokawa
- Graduate School of Science and Technology, Chiba University, Chiba 263-8522, Japan; Department of Chemistry, Kyushu University, Fukuoka 812-8581, Japan; Advanced Science Research Center, JAERI, Ibaraki 319-1195, Japan; and Department of Chemistry and Biotechnology, Chiba University, Chiba 263-8522, Japan
| | - Kanae Morishita
- Graduate School of Science and Technology, Chiba University, Chiba 263-8522, Japan; Department of Chemistry, Kyushu University, Fukuoka 812-8581, Japan; Advanced Science Research Center, JAERI, Ibaraki 319-1195, Japan; and Department of Chemistry and Biotechnology, Chiba University, Chiba 263-8522, Japan
| | - Satoshi Koizumi
- Graduate School of Science and Technology, Chiba University, Chiba 263-8522, Japan; Department of Chemistry, Kyushu University, Fukuoka 812-8581, Japan; Advanced Science Research Center, JAERI, Ibaraki 319-1195, Japan; and Department of Chemistry and Biotechnology, Chiba University, Chiba 263-8522, Japan
| | - Takayuki Nakahira
- Graduate School of Science and Technology, Chiba University, Chiba 263-8522, Japan; Department of Chemistry, Kyushu University, Fukuoka 812-8581, Japan; Advanced Science Research Center, JAERI, Ibaraki 319-1195, Japan; and Department of Chemistry and Biotechnology, Chiba University, Chiba 263-8522, Japan
| | - Masahiko Annaka
- Graduate School of Science and Technology, Chiba University, Chiba 263-8522, Japan; Department of Chemistry, Kyushu University, Fukuoka 812-8581, Japan; Advanced Science Research Center, JAERI, Ibaraki 319-1195, Japan; and Department of Chemistry and Biotechnology, Chiba University, Chiba 263-8522, Japan
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Bryskhe K, Jansson J, Topgaard D, Schillén K, Olsson U. Spontaneous Vesicle Formation in a Block Copolymer System. J Phys Chem B 2004. [DOI: 10.1021/jp031313u] [Citation(s) in RCA: 54] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Karin Bryskhe
- Physical Chemistry 1, Center for Chemistry and Chemical Engineering, Lund University, P.O. Box 124, S-221 00 Lund, Sweden
| | - Jörgen Jansson
- Physical Chemistry 1, Center for Chemistry and Chemical Engineering, Lund University, P.O. Box 124, S-221 00 Lund, Sweden
| | - Daniel Topgaard
- Physical Chemistry 1, Center for Chemistry and Chemical Engineering, Lund University, P.O. Box 124, S-221 00 Lund, Sweden
| | - Karin Schillén
- Physical Chemistry 1, Center for Chemistry and Chemical Engineering, Lund University, P.O. Box 124, S-221 00 Lund, Sweden
| | - Ulf Olsson
- Physical Chemistry 1, Center for Chemistry and Chemical Engineering, Lund University, P.O. Box 124, S-221 00 Lund, Sweden
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50
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Oh KT, Bronich TK, Kabanov AV. Micellar formulations for drug delivery based on mixtures of hydrophobic and hydrophilic Pluronic® block copolymers. J Control Release 2004; 94:411-22. [PMID: 14744491 DOI: 10.1016/j.jconrel.2003.10.018] [Citation(s) in RCA: 193] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Micelles formed by Pluronic block copolymers (PBC) have been studied in multiple applications as drug delivery systems. Hydrophobic PBC form lamellar aggregates with a higher solubilization capacity than spherical micelles formed by hydrophilic PBC. However, they also have a larger size and low stability. To overcome these limitations, binary mixtures from hydrophobic PBC (L121, L101, L81, and L61) and hydrophilic PBC (F127, P105, F87, P85, and F68) were prepared. In most cases, PBC mixtures were not stable, revealing formation of large aggregates and phase separation within 1-2 day(s). However, stable aqueous dispersions of the particles were obtained upon (1). sonication of the PBC mixtures for 1 or 2 min or (2). heating at 70 degrees C for 30 min. Among all combinations, L121/F127 mixtures (1:1% weight ratio) formed stable dispersions with a small particle size. The solubilizing capacity of this system was examined using a model water-insoluble dye, Sudan (III). Mixed L121/F127 aggregates exhibited approximately 10-fold higher solubilization capacity compared to that of F127 micelles. In conclusion, stable aqueous dispersions of nanoscale size were prepared from mixtures of hydrophobic and hydrophilic PBC by using the external input of energy. The prepared mixed aggregates can efficiently incorporate hydrophobic compounds.
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Affiliation(s)
- Kyung T Oh
- Department of Pharmaceutical Science, College of Pharmacy, 986025 University of Nebraska Medical Center, Omaha, NE 68198-6025, USA
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