101
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Nguyen AT, Lewin PA, Wrenn SP. Hydrophobic drug concentration affects the acoustic susceptibility of liposomes. Biochim Biophys Acta Gen Subj 2014; 1850:667-72. [PMID: 25450487 DOI: 10.1016/j.bbagen.2014.11.001] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2014] [Revised: 10/31/2014] [Accepted: 11/01/2014] [Indexed: 01/03/2023]
Abstract
The purpose of this study was to investigate the effect of encapsulated hydrophobic drug concentration on ultrasound-mediated leakage from liposomes. Studies have shown that membrane modifications affect the acoustic susceptibility of liposomes, likely because of changes in membrane packing. An advantage of liposome as drug carrier is its ability to encapsulate drugs of different chemistries. However, incorporation of hydrophobic molecules into the bilayer may cause changes in membrane packing, thereby affecting the release kinetics. Liposomes containing calcein and varying concentrations of papaverine, a hydrophobic drug, were exposed to 20 kHz, 2.2 Wcm(-2) ultrasound. Papaverine concentration was observed to affect calcein leakage although the effects varied widely based on liposome phase. For example, incorporation of 0.5mg/mL papaverine into Ld liposomes increased the leakage of hydrophilic encapsulants by 3× within the first minute (p=0.004) whereas the same amount of papaverine increased leakage by only 1.5× (p<0.0001). Papaverine was also encapsulated into echogenic liposomes and its concentration did not significantly affect calcein release rates, suggesting that burst release from echogenic liposomes is predictable regardless of encapsulants chemistry and concentration.
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Affiliation(s)
- An T Nguyen
- School of Biomedical Engineering, Science and Health Systems, Drexel University, Philadelphia, PA 19104, USA
| | - Peter A Lewin
- School of Biomedical Engineering, Science and Health Systems, Drexel University, Philadelphia, PA 19104, USA
| | - Steven P Wrenn
- School of Biomedical Engineering, Science and Health Systems, Drexel University, Philadelphia, PA 19104, USA.
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102
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Bending rigidity of phosphatidylserine-containing lipid bilayers in acidic aqueous solutions. Colloids Surf A Physicochem Eng Asp 2014. [DOI: 10.1016/j.colsurfa.2013.12.059] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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103
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Chiang YT, Lo CL. pH-Responsive polymer-liposomes for intracellular drug delivery and tumor extracellular matrix switched-on targeted cancer therapy. Biomaterials 2014; 35:5414-5424. [DOI: 10.1016/j.biomaterials.2014.03.046] [Citation(s) in RCA: 65] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2014] [Accepted: 03/18/2014] [Indexed: 10/25/2022]
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104
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Nehoff H, Parayath NN, Domanovitch L, Taurin S, Greish K. Nanomedicine for drug targeting: strategies beyond the enhanced permeability and retention effect. Int J Nanomedicine 2014; 9:2539-55. [PMID: 24904213 PMCID: PMC4039421 DOI: 10.2147/ijn.s47129] [Citation(s) in RCA: 85] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
Abstract
The growing research interest in nanomedicine for the treatment of cancer and inflammatory-related pathologies is yielding encouraging results. Unfortunately, enthusiasm is tempered by the limited specificity of the enhanced permeability and retention effect. Factors such as lack of cellular specificity, low vascular density, and early release of active agents prior to reaching their target contribute to the limitations of the enhanced permeability and retention effect. However, improved nanomedicine designs are creating opportunities to overcome these problems. In this review, we present examples of the advances made in this field and endeavor to highlight the potential of these emerging technologies to improve targeting of nanomedicine to specific pathological cells and tissues.
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Affiliation(s)
- Hayley Nehoff
- Department of Pharmacology and Toxicology, University of Otago, Dunedin, New Zealand
| | - Neha N Parayath
- Department of Pharmacology and Toxicology, University of Otago, Dunedin, New Zealand
| | - Laura Domanovitch
- Department of Pharmacology and Toxicology, University of Otago, Dunedin, New Zealand
| | - Sebastien Taurin
- Department of Pharmacology and Toxicology, University of Otago, Dunedin, New Zealand
| | - Khaled Greish
- Department of Pharmacology and Toxicology, University of Otago, Dunedin, New Zealand ; Department of Oncology, Faculty of Medicine, Suez Canal University, Egypt
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105
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Musyanovych A, Landfester K. Polymer Micro- and Nanocapsules as Biological Carriers with Multifunctional Properties. Macromol Biosci 2014; 14:458-77. [DOI: 10.1002/mabi.201300551] [Citation(s) in RCA: 107] [Impact Index Per Article: 10.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2013] [Revised: 02/03/2014] [Indexed: 12/12/2022]
Affiliation(s)
- Anna Musyanovych
- Fraunhofer ICT-IMM; Carl-Zeiss-Str. 18-20 55129 Mainz Germany
- Max Planck Institute for Polymer Research; Ackermannweg 10 55128 Mainz Germany
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106
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Paliwal SR, Paliwal R, Vyas SP. A review of mechanistic insight and application of pH-sensitive liposomes in drug delivery. Drug Deliv 2014; 22:231-42. [PMID: 24524308 DOI: 10.3109/10717544.2014.882469] [Citation(s) in RCA: 125] [Impact Index Per Article: 12.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
The pH-sensitive liposomes have been extensively used as an alternative to conventional liposomes in effective intracellular delivery of therapeutics/antigen/DNA/diagnostics to various compartments of the target cell. Such liposomes are destabilized under acidic conditions of the endocytotic pathway as they usually contain pH-sensitive lipid components. Therefore, the encapsulated content is delivered into the intracellular bio-environment through destabilization or its fusion with the endosomal membrane. The therapeutic efficacy of pH-sensitive liposomes enables them as biomaterial with commercial utility especially in cancer treatment. In addition, targeting ligands including antibodies can be anchored on the surface of pH-sensitive liposomes to target specific cell surface receptors/antigen present on tumor cells. These vesicles have also been widely explored for antigen delivery and serve as immunological adjuvant to enhance the immune response to antigens. The present review deals with recent research updates on application of pH-sensitive liposomes in chemotherapy/diagnostics/antigen/gene delivery etc.
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Affiliation(s)
- Shivani Rai Paliwal
- Department of Pharmaceutics, SLT Institute of Pharmaceutical Sciences, Guru Ghasidas Vishwavidyalaya Bilaspur , Chhattisgarh , India
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107
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Abstract
Nanoparticles are rapidly being developed and trialed to overcome several limitations of traditional drug delivery systems and are coming up as a distinct therapeutics for cancer treatment. Conventional chemotherapeutics possess some serious side effects including damage of the immune system and other organs with rapidly proliferating cells due to nonspecific targeting, lack of solubility, and inability to enter the core of the tumors resulting in impaired treatment with reduced dose and with low survival rate. Nanotechnology has provided the opportunity to get direct access of the cancerous cells selectively with increased drug localization and cellular uptake. Nanoparticles can be programmed for recognizing the cancerous cells and giving selective and accurate drug delivery avoiding interaction with the healthy cells. This review focuses on cell recognizing ability of nanoparticles by various strategies having unique identifying properties that distinguish them from previous anticancer therapies. It also discusses specific drug delivery by nanoparticles inside the cells illustrating many successful researches and how nanoparticles remove the side effects of conventional therapies with tailored cancer treatment.
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108
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Morrow BH, Koenig PH, Shen JK. Self-assembly and bilayer-micelle transition of fatty acids studied by replica-exchange constant pH molecular dynamics. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2013; 29:14823-14830. [PMID: 24215478 PMCID: PMC3946477 DOI: 10.1021/la403398n] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
Recent interest in the development of surfactant-based nanodelivery systems targeting tumor sites has sparked our curiosity in understanding the detailed mechanism of the self-assembly and phase transitions of pH-sensitive surfactants. Toward this goal, we applied a state-of-the-art simulation technique, continuous constant pH molecular dynamics (CpHMD) with the hybrid-solvent scheme and pH-based replica-exchange protocol, to study the de novo self-assembly of 30 and 40 lauric acids, a simple model titratable surfactant. We observed the formation of a gel-state bilayer at low and intermediate pH and a spherical micelle at high pH, with the phase transition starting at 20-30% ionization and being completed at 50%. The degree of cooperativity for the transition increases from the 30-mer to the 40-mer. The calculated apparent or bulk pKa value is 7.0 for the 30-mer and 7.5 for the 40-mer. Congruent with experiment, these data demonstrate that CpHMD is capable of accurately modeling large conformational transitions of surfactant systems while allowing the simultaneous proton titration of constituent molecules. We suggest that CpHMD simulations may become a useful tool in aiding in the design and development of pH-sensitive nanocarriers for a variety of biomedical and technological applications.
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Affiliation(s)
- Brian H. Morrow
- Department of Pharmaceutical Sciences, School of Pharmacy, University of Maryland, Baltimore, MD 21201
| | - Peter H. Koenig
- Computational Chemistry, Modeling & Simulation GCO, Procter and Gamble, Cincinnati, OH
| | - Jana K. Shen
- Department of Pharmaceutical Sciences, School of Pharmacy, University of Maryland, Baltimore, MD 21201
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109
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Oude Blenke E, Mastrobattista E, Schiffelers RM. Strategies for triggered drug release from tumor targeted liposomes. Expert Opin Drug Deliv 2013; 10:1399-410. [DOI: 10.1517/17425247.2013.805742] [Citation(s) in RCA: 57] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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110
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Zheng H, Xing L, Cao Y, Che S. Coordination bonding based pH-responsive drug delivery systems. Coord Chem Rev 2013. [DOI: 10.1016/j.ccr.2013.03.007] [Citation(s) in RCA: 108] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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111
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Yi J, Barrow AJ, Yu N, O'Neill BE. Efficient electroporation of liposomes doped with pore stabilizing nisin. J Liposome Res 2013; 23:197-202. [PMID: 23594238 DOI: 10.3109/08982104.2013.788024] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
CONTEXT Liposomes have a long history as passive and active drug carriers. Recently, a few methods have been realized to control the release from liposomes, including heating, ultrasound and laser. OBJECTIVE We report on a new approach to drive release from liposomes using electric fields. MATERIALS AND METHODS Liposomes were manufactured containing a high concentration of (quenched) 5-6 carboxyfluorescein dye. Nisin, a well-known amphiphilic peptide lantibiotic that works by stabilizing pores formed in cell membranes, was mixed in solution inside or outside the liposomes. The liposomes were then electroporated using a range of voltages, and assayed for increases in fluorescence due to release of dye. Release was measured against positive and negative controls, with positive control release driven by a strong detergent. RESULTS Our results demonstrate that the addition of nisin significantly reduces the electric field required to release the contents of liposomes, from 2000 V/m to approximately 200 V/m. This result proves that, in principle, electroporation (EP) of liposomes doped with small amounts of amphiphilic pore stabilizing peptides may be a practical means to drive release of liposomal contents in vivo. CONCLUSION Drug delivery from liposomes doped with amphiphilic peptides using EP is feasible. This technique could be developed into a potent adjuvant to tumor ablation using irreversible EP.
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Affiliation(s)
- Jiang Yi
- Department of Translational Imaging, The Methodist Hospital Research Institute, Houston, TX 77030, USA
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112
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Morrow BH, Koenig PH, Shen JK. Atomistic simulations of pH-dependent self-assembly of micelle and bilayer from fatty acids. J Chem Phys 2013. [PMID: 23181330 DOI: 10.1063/1.4766313] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Detailed knowledge of the self-assembly and phase behavior of pH-sensitive surfactants has implications in areas such as targeted drug delivery. Here we present a study of the formation of micelle and bilayer from lauric acids using a state-of-the-art simulation technique, continuous constant pH molecular dynamics (CpHMD) with conformational sampling in explicit solvent and the pH-based replica-exchange protocol. We find that at high pH conditions a spherical micelle is formed, while at low pH conditions a bilayer is formed with a considerable degree of interdigitation. The mid-point of the phase transition is in good agreement with experiment. Preliminary investigation also reveals that the effect of counterions and salt screening shifts the transition mid-point and does not change the structure of the surfactant assembly. Based on these data we suggest that CpHMD simulations may be applied to computational design of surfactant-based nano devices in the future.
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Affiliation(s)
- Brian H Morrow
- Department of Pharmaceutical Sciences, University of Maryland, Baltimore, Maryland 21201, USA
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113
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Abstract
This position paper discusses progress made and to be made with so-called advanced drug delivery systems, particularly but not exclusively those in the nanometre domain. The paper has resulted from discussions with a number of international experts in the field who shared their views on aspects of the subject, from the nomenclature used for such systems, the sometimes overwrought claims made in the era of nanotechnology, the complex nature of targeting delivery systems to specific destinations in vivo, the need for setting standards for the choice and characterisation of cell lines used in in vitro studies, to attention to the manufacturability, stability and analytical profiling of systems and more relevant studies on toxicology. The historical background to the development of many systems is emphasised. So too is the stochastic nature of many of the steps to successful access to and action in targets. A lacuna in the field is the lack of availability of data on a variety of carrier systems using the same models in vitro and in vivo using standard controls. The paper asserts that greater emphasis must also be paid to the effective levels of active attained in target organs, for without such crucial data it will be difficult for many experimental systems to enter the clinic. This means the use of diagnostic/imaging technologies to monitor targeted drug delivery and stratify patient groups, identifying patients with optimum chances for successful therapy. Last, but not least, the critical importance of the development of science bases for regulatory policies, scientific platforms overseeing the field and new paradigms of financing are discussed.
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Affiliation(s)
- Daan J A Crommelin
- Department of Pharmaceutical Sciences, University of Utrecht, 3511 ME Utrecht, The Netherlands.
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114
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Bamrungsap S, Zhao Z, Chen T, Wang L, Li C, Fu T, Tan W. Nanotechnology in therapeutics: a focus on nanoparticles as a drug delivery system. Nanomedicine (Lond) 2013; 7:1253-71. [PMID: 22931450 DOI: 10.2217/nnm.12.87] [Citation(s) in RCA: 306] [Impact Index Per Article: 27.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
Abstract
Continuing improvement in the pharmacological and therapeutic properties of drugs is driving the revolution in novel drug delivery systems. In fact, a wide spectrum of therapeutic nanocarriers has been extensively investigated to address this emerging need. Accordingly, this article will review recent developments in the use of nanoparticles as drug delivery systems to treat a wide variety of diseases. Finally, we will introduce challenges and future nanotechnology strategies to overcome limitations in this field.
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Affiliation(s)
- Suwussa Bamrungsap
- National Nanotechnology Center (NANOTEC), Thailand Science Park, Pathumthani 12120, Thailand
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115
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Xue Y, Guan Y, Zheng A, Xiao H. Amphoteric calix[8]arene-based complex for pH-triggered drug delivery. Colloids Surf B Biointerfaces 2013; 101:55-60. [DOI: 10.1016/j.colsurfb.2012.06.022] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2012] [Revised: 05/30/2012] [Accepted: 06/01/2012] [Indexed: 10/28/2022]
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116
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Allen TM, Cullis PR. Liposomal drug delivery systems: from concept to clinical applications. Adv Drug Deliv Rev 2013; 65:36-48. [PMID: 23036225 DOI: 10.1016/j.addr.2012.09.037] [Citation(s) in RCA: 2935] [Impact Index Per Article: 266.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2012] [Revised: 09/10/2012] [Accepted: 09/20/2012] [Indexed: 02/06/2023]
Abstract
The first closed bilayer phospholipid systems, called liposomes, were described in 1965 and soon were proposed as drug delivery systems. The pioneering work of countless liposome researchers over almost 5 decades led to the development of important technical advances such as remote drug loading, extrusion for homogeneous size, long-circulating (PEGylated) liposomes, triggered release liposomes, liposomes containing nucleic acid polymers, ligand-targeted liposomes and liposomes containing combinations of drugs. These advances have led to numerous clinical trials in such diverse areas as the delivery of anti-cancer, anti-fungal and antibiotic drugs, the delivery of gene medicines, and the delivery of anesthetics and anti-inflammatory drugs. A number of liposomes (lipidic nanoparticles) are on the market, and many more are in the pipeline. Lipidic nanoparticles are the first nanomedicine delivery system to make the transition from concept to clinical application, and they are now an established technology platform with considerable clinical acceptance. We can look forward to many more clinical products in the future.
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117
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Bandekar A, Zhu C, Gomez A, Menzenski MZ, Sempkowski M, Sofou S. Masking and Triggered Unmasking of Targeting Ligands on Liposomal Chemotherapy Selectively Suppress Tumor Growth in Vivo. Mol Pharm 2012; 10:152-60. [DOI: 10.1021/mp3002717] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Affiliation(s)
- Amey Bandekar
- Department
of Biomedical Engineering
and Department of Chemical and Biochemical Engineering, Rutgers, The
State University of New Jersey, Piscataway, New Jersey 08854, United
States
| | - Charles Zhu
- Department
of Biomedical Engineering
and Department of Chemical and Biochemical Engineering, Rutgers, The
State University of New Jersey, Piscataway, New Jersey 08854, United
States
| | - Ana Gomez
- Department
of Biomedical Engineering
and Department of Chemical and Biochemical Engineering, Rutgers, The
State University of New Jersey, Piscataway, New Jersey 08854, United
States
| | | | - Michelle Sempkowski
- Department of Biomedical Engineering,
The College of New Jersey, Ewing, New Jersey 08628, United States
| | - Stavroula Sofou
- Department
of Biomedical Engineering
and Department of Chemical and Biochemical Engineering, Rutgers, The
State University of New Jersey, Piscataway, New Jersey 08854, United
States
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118
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Abstract
There is a need for developing improved therapeutic options for the management of prostate cancer, able to inhibit proliferation of precancerous and malignant lesions and/or to improve the effectiveness of conventional chemopreventive and chemotherapeutic agents. In this perspective, application of nanotechnology based strategies for the delivery of natural compounds for effective management of the disease is being actively researched. Here, after highlighting the most promising natural compounds for chemoprevention and chemotherapy of prostate cancer, the state of the art nanotherapeutics and the recent proof-of-concept of "nanochemoprevention", as well as the clinical development of promising targeted nanoprototypes for use in the prostate cancer treatment are being discussed.
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119
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Cheng Z, Zaki AA, Hui JZ, Muzykantov VR, Tsourkas A. Multifunctional nanoparticles: cost versus benefit of adding targeting and imaging capabilities. Science 2012; 338:903-10. [PMID: 23161990 PMCID: PMC3660151 DOI: 10.1126/science.1226338] [Citation(s) in RCA: 943] [Impact Index Per Article: 78.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
Nanoparticle-based drug delivery systems have been developed to improve the efficacy and reduce the systemic toxicity of a wide range of drugs. Although clinically approved nanoparticles have consistently shown value in reducing drug toxicity, their use has not always translated into improved clinical outcomes. This has led to the development of "multifunctional" nanoparticles, where additional capabilities like targeting and image contrast enhancement are added to the nanoparticles. However, additional functionality means additional synthetic steps and costs, more convoluted behavior and effects in vivo, and also greater regulatory hurdles. The trade-off between additional functionality and complexity is the subject of ongoing debate and the focus of this Review.
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Affiliation(s)
- Zhiliang Cheng
- Department of Bioengineering, University of Pennsylvania, 240 Skirkanich Hall, 210 S. 33 Street, Philadelphia, PA 19104
| | - Ajlan Al Zaki
- Department of Bioengineering, University of Pennsylvania, 240 Skirkanich Hall, 210 S. 33 Street, Philadelphia, PA 19104
| | - James Z. Hui
- Department of Bioengineering, University of Pennsylvania, 240 Skirkanich Hall, 210 S. 33 Street, Philadelphia, PA 19104
| | - Vladimir R. Muzykantov
- Institute for Translational Medicine & Therapeutics & Department of Pharmacology, University of Pennsylvania School of Medicine, TRC 10-125, 3400 Civic Center Blvd, Bldg 421, Philadelphia, PA 19104
| | - Andrew Tsourkas
- Department of Bioengineering, University of Pennsylvania, 240 Skirkanich Hall, 210 S. 33 Street, Philadelphia, PA 19104
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120
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Watanabe K, Ishima Y, Akaike T, Sawa T, Kuroda T, Ogawa W, Watanabe H, Suenaga A, Kai T, Otagiri M, Maruyama T. S-nitrosated α-1-acid glycoprotein kills drug-resistant bacteria and aids survival in sepsis. FASEB J 2012; 27:391-8. [PMID: 23047897 DOI: 10.1096/fj.12-217794] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Treating infections with exogenous NO, which shows broad-spectrum antimicrobial activity, appears to be effective. Similar to NO biosynthesis, biosynthesis of α-1-acid glycoprotein variant A (AGPa), with a reduced cysteine (Cys149), increases markedly during inflammation and infection. We hypothesized that AGPa is an S-nitrosation target in acute-phase proteins. This study aimed to determine whether S-nitrosated AGPa (SNO-AGPa) may be the first compound of this novel antibacterial class against multidrug-resistant bacteria. AGPa was incubated with RAW264.7 cells activated by lipopolysaccharide and interferon-γ. The antimicrobial effects of SNO-AGPa were determined by measuring the turbidity of the bacterial suspensions in vitro and survival in a murine sepsis model in vivo, respectively. Results indicated that endogenous NO generated by activated RAW264.7 cells caused S-nitrosation of AGPa at Cys149. SNO-AGPa strongly inhibited growth of gram-positive, gram-negative, and multidrug-resistant bacteria and was an extremely potent bacteriostatic compound (IC(50): 10(-9) to 10(-6) M). The antibacterial mechanism of SNO-AGPa involves S-transnitrosation from SNO-AGPa to bacterial cells. Treatment with SNO-AGPa, but not with AGPa, markedly reduced bacterial counts in blood and liver in a mouse sepsis model. The sialyl residues of AGPa seem to suppress the antibacterial activity, since SNO-asialo AGPa was more potent than SNO-AGPa.
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Affiliation(s)
- Kaori Watanabe
- Department of Biopharmaceutics, Graduate School of Pharmaceutical Sciences, Kumamoto University, Kumamoto, Japan
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121
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Kim HK, Van den Bossche J, Hyun SH, Thompson DH. Acid-triggered release via dePEGylation of fusogenic liposomes mediated by heterobifunctional phenyl-substituted vinyl ethers with tunable pH-sensitivity. Bioconjug Chem 2012; 23:2071-7. [PMID: 22988941 DOI: 10.1021/bc300266y] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
A new family of heterobifunctional phenyl-substituted vinyl ether (PIVE) coupling agents with tunable acid-sensitivity has been developed. The PIVE compounds are designed to hydrolyze under acidic conditions with hydrolysis rates that can be varied by rational selection of the phenyl ring substituent. These reagents were incorporated within 2-methoxypoly(ethylene glycol) PEG-conjugated 1,3-dioctadecyl-rac-glycerol lipids to produce the acid-cleavable lipopolymers mPEG-[H-PIVE]-DOG, mPEG-[F-PIVE]-DOG, mPEG-[Me-PIVE]-DOG, and mPEG-[MeO-PIVE]-DOG. These lipopolymers were hydrolyzed under acidic conditions (pH 3.5 or 4.5) at rates that were dependent on the electron donating or withdrawing character of the α-phenyl vinyl ether substituent, while remaining stable at pH 7.4. Blending of these compounds with 1,2-dioleoyl-sn-glycero-3-phosphoethanolamine (DOPE) in a 10:90 mPEG-PIVE-Lipid:DOPE ratio produced stable liposomes at neutral pH; however, acidification of the solution led to dePEGylation and release of the liposomal cargo in a manner that correlated with the PIVE proton affinity. Specifically, we observed 70% calcein release within 12 h from mPEG-[MeO-PIVE]-DOG-containing liposomes at pH 4.5, whereas only 22% calcein release was observed from mPEG-[F-PIVE]-DOG:DOPE liposomes over this same time scale and pH. These results indicate that dePEGylation following acidification is a triggering mechanism that can be rationally designed and controlled through the appropriate selection of PIVE moieties.
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Affiliation(s)
- Hee-Kwon Kim
- Department of Chemistry, Purdue University, 560 Oval Drive, West Lafayette, IN 47907, USA
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122
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Callahan DJ, Liu W, Li X, Dreher MR, Hassouneh W, Kim M, Marszalek P, Chilkoti A. Triple stimulus-responsive polypeptide nanoparticles that enhance intratumoral spatial distribution. NANO LETTERS 2012; 12:2165-70. [PMID: 22417133 PMCID: PMC3474318 DOI: 10.1021/nl300630c] [Citation(s) in RCA: 79] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/09/2023]
Abstract
To address the limited tumor penetration of nanoparticle drug delivery vehicles, we report the first pH-responsive polypeptide micelle that dissociates at the low extracellular pH of solid tumors. This histidine-rich elastin-like polypeptide block copolymer self-assembles at 37 °C into spherical micelles that are stabilized by Zn(2+) and are disrupted as the pH drops from 7.4 to 6.4. These pH-sensitive micelles demonstrate better in vivo penetration and distribution in tumors than a pH-insensitive control.
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Affiliation(s)
- Daniel J. Callahan
- Department of Biomedical Engineering, Duke University, 136 Hudson Hall, Box 90281, Durham NC, 27708
- Center for Biologically Inspired Materials and Material Systems, Duke University, Box 90300, Durham, NC, 27708
| | - Wenge Liu
- Department of Biomedical Engineering, Duke University, 136 Hudson Hall, Box 90281, Durham NC, 27708
| | - Xinghai Li
- Department of Biomedical Engineering, Duke University, 136 Hudson Hall, Box 90281, Durham NC, 27708
| | - Matthew R. Dreher
- Center for Interventional Oncology, Clinical Center, National Cancer Institute, National Institutes of Health, 9000 Rockville Pike, Bethesda, MD, 20892
| | - Wafa Hassouneh
- Department of Biomedical Engineering, Duke University, 136 Hudson Hall, Box 90281, Durham NC, 27708
- Center for Biologically Inspired Materials and Material Systems, Duke University, Box 90300, Durham, NC, 27708
| | - Minkyu Kim
- Center for Biologically Inspired Materials and Material Systems, Duke University, Box 90300, Durham, NC, 27708
- Department of Mechanical Engineering and Materials Science, Duke University, Box 90300, Durham, NC, 27708
| | - Piotr Marszalek
- Center for Biologically Inspired Materials and Material Systems, Duke University, Box 90300, Durham, NC, 27708
- Department of Mechanical Engineering and Materials Science, Duke University, Box 90300, Durham, NC, 27708
| | - Ashutosh Chilkoti
- Department of Biomedical Engineering, Duke University, 136 Hudson Hall, Box 90281, Durham NC, 27708
- Center for Biologically Inspired Materials and Material Systems, Duke University, Box 90300, Durham, NC, 27708
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123
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124
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Bandekar A, Karve S, Chang MY, Mu Q, Rotolo J, Sofou S. Antitumor efficacy following the intracellular and interstitial release of liposomal doxorubicin. Biomaterials 2012; 33:4345-52. [PMID: 22429980 DOI: 10.1016/j.biomaterials.2012.02.039] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2011] [Accepted: 02/22/2012] [Indexed: 12/13/2022]
Abstract
pH-triggered lipid-membranes designed from biophysical principles are evaluated in the form of targeted liposomal doxorubicin with the aim to ultimately better control the growth of vascularized tumors. We compare the antitumor efficacy of anti-HER2/neu pH-triggered lipid vesicles encapsulating doxorubicin to the anti-HER2/neu form of an FDA approved liposomal doxorubicin of DSPC/cholesterol-based vesicles. The HER2/neu receptor is chosen due to its abundance in human breast cancers and its connection to low prognosis. On a subcutaneous murine BT474 xenograft model, superior control of tumor growth is demonstrated by targeted pH-triggered vesicles relative to targeted DSPC/cholesterol-based vesicles (35% vs. 19% decrease in tumor volume after 32 days upon initiation of treatment). Superior tumor control is also confirmed on SKBR3 subcutaneous xenografts of lower HER2/neu expression. The non-targeted form of pH-triggered vesicles encapsulating doxorubicin results also in better tumor control relative to the non-targeted DSPC/cholesterol-based vesicles (34% vs. 41% increase in tumor volume). Studies in BT474 multicellular spheroids suggest that the observed efficacy could be attributed to release of doxorubicin directly into the acidic tumor interstitium from pH-triggered vesicles extravasated into the tumor but not internalized by cancer cells. pH-triggered liposome carriers engineered from gel-phase bilayers that reversibly phase-separate with lowering pH, form transiently defective interfacial boundaries resulting in fast release of encapsulated doxorubicin. Our studies show that pH-triggered liposomes release encapsulated doxorubicin intracellularly and intratumorally, and may improve tumor control at the same or even lower administered doses relative to FDA approved liposomal chemotherapy.
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Affiliation(s)
- Amey Bandekar
- Biomedical Engineering, and Chemical and Biochemical Engineering, Rutgers University, Piscataway, NJ 08854, USA
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125
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Zaro JL, Fei L, Shen WC. Recombinant peptide constructs for targeted cell penetrating peptide-mediated delivery. J Control Release 2012; 158:357-61. [DOI: 10.1016/j.jconrel.2012.01.039] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2011] [Revised: 01/24/2012] [Accepted: 01/27/2012] [Indexed: 01/03/2023]
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126
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Zheng H, Huang Z, Che S. Mesostructured chitosan–silica hybrid as a biodegradable carrier for a pH-responsive drug delivery system. Dalton Trans 2012; 41:5038-44. [DOI: 10.1039/c2dt12347a] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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127
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Xing L, Cao Y, Che S. Synthesis of core–shell coordination polymer nanoparticles (CPNs) for pH-responsive controlled drug release. Chem Commun (Camb) 2012; 48:5995-7. [DOI: 10.1039/c2cc30877k] [Citation(s) in RCA: 61] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
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128
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Zheng H, Che S. Amino/quaternary ammonium groups bifunctionalized large pore mesoporous silica for pH-responsive large drug delivery. RSC Adv 2012. [DOI: 10.1039/c2ra20380d] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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129
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Jin D, Lee JH, Seo ML, Jaworski J, Jung JH. Controlled drug delivery from mesoporous silica using a pH-response release system. NEW J CHEM 2012. [DOI: 10.1039/c2nj20976d] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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130
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Prosser BL, Ward CW, Lederer WJ, Muzykantov VR, Tsourkas A, Chung W, Croft GF, Saphier G, Leibel R, Goland R, Wichterle H, Henderson CE, Eggan K. X-ROS signaling: rapid mechano-chemo transduction in heart. Science 2011. [PMID: 8493574 DOI: 10.1126/science] [Citation(s) in RCA: 296] [Impact Index Per Article: 22.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
We report that in heart cells, physiologic stretch rapidly activates reduced-form nicotinamide adenine dinucleotide phosphate (NADPH) oxidase 2 (NOX2) to produce reactive oxygen species (ROS) in a process dependent on microtubules (X-ROS signaling). ROS production occurs in the sarcolemmal and t-tubule membranes where NOX2 is located and sensitizes nearby ryanodine receptors (RyRs) in the sarcoplasmic reticulum (SR). This triggers a burst of Ca(2+) sparks, the elementary Ca(2+) release events in heart. Although this stretch-dependent "tuning" of RyRs increases Ca(2+) signaling sensitivity in healthy cardiomyocytes, in disease it enables Ca(2+) sparks to trigger arrhythmogenic Ca(2+) waves. In the mouse model of Duchenne muscular dystrophy, hyperactive X-ROS signaling contributes to cardiomyopathy through aberrant Ca(2+) release from the SR. X-ROS signaling thus provides a mechanistic explanation for the mechanotransduction of Ca(2+) release in the heart and offers fresh therapeutic possibilities.
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Affiliation(s)
- Benjamin L Prosser
- Center for Biomedical Engineering and Technology (BioMET), University of Maryland School of Medicine, Baltimore, MD 21209, USA
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131
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Mamasheva E, O'Donnell C, Bandekar A, Sofou S. Heterogeneous liposome membranes with pH-triggered permeability enhance the in vitro antitumor activity of folate-receptor targeted liposomal doxorubicin. Mol Pharm 2011; 8:2224-32. [PMID: 21899300 DOI: 10.1021/mp200079y] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The killing efficacy of doxorubicin from liposome-based delivery carriers has been shown to correlate strongly with its intracellular trafficking and, in particular, its fast and extensive release from the delivery carrier. However, previously explored pH-triggered mechanisms that were designed to become activated during liposome endocytosis have also been shown to interfere with the liposome stability in vivo. We have designed pH-triggered gel-phase liposomes with heterogeneous membranes for the delivery of doxorubicin. These liposomes are triggered to form "leaky" interfacial boundaries between gel-gel phase separated domains on the membrane bilayer with lowering pH. The pH-triggered mechanism does not compromise liposome stability in vivo and results in superior in vitro killing efficacy of delivered doxorubicin when liposomes are endocytosed by a clathrin-mediated pathway. In the present work, we evaluate the general applicability of these liposomes when targeted to the folate receptor (FR) of KB cancer cells in vitro and become endocytosed by a less acidic pathway: the caveolae pathway. FR-targeting liposomes exhibit almost 50% decrease in cell association for increase in liposome size from 120 to 280 nm in diameter after relatively short incubation times (up to 4 h). The fraction of internalized vesicles, however, is approximately 60% of the cell associated vesicles independent of their size. Our findings demonstrate that, for the same doxorubicin uptake per cancer cell, the killing effect of doxorubicin delivered by pH-triggered lipid vesicles is greater (IC(50) = 0.032 mM for a 6 h incubation) than when delivered by a conventional non-pH-responsive composition (IC(50) = 0.194 mM). These findings suggest higher bioexposure of cells to the therapeutic agent possibly via faster and more extensive release from the carrier. Animal studies of FR-targeting non-pH-responsive liposomal doxorubicin report stronger therapeutic potential for the targeted approach relative to nontargeted liposomes and to free doxorubicin. The findings of the present study suggest that the targeted pH-triggered liposomes could potentially further enhance the therapeutic outcomes of doxorubicin in vivo.
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Affiliation(s)
- Elina Mamasheva
- Department of Biomedical Engineering, Rutgers University, 599 Taylor Road, Piscataway, New Jersey 08854, United States
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132
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Agarwal A, Mackey MA, El-Sayed MA, Bellamkonda RV. Remote triggered release of doxorubicin in tumors by synergistic application of thermosensitive liposomes and gold nanorods. ACS NANO 2011; 5:4919-26. [PMID: 21591812 DOI: 10.1021/nn201010q] [Citation(s) in RCA: 168] [Impact Index Per Article: 12.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
Delivery of chemotherapeutic agents after encapsulation in nanocarriers such as liposomes diminishes side-effects, as PEGylated nanocarrier pharmacokinetics decrease dosing to healthy tissues and accumulate in tumors due to the enhanced permeability and retention effect. Once in the tumor, however, dosing of the chemotherapeutic to tumor cells is limited potentially by the rate of release from the carriers and the size-constrained, poor diffusivity of nanocarriers in tumor interstitium. Here, we report the design and fabrication of a thermosensitive liposomal nanocarrier that maintains its encapsulation stability with a high concentration of doxorubicin payload, thereby minimizing "leak" and attendant toxicity. When used synergistically with PEGylated gold nanorods and near-infrared stimulation, remote triggered release of doxorubicin from thermosensitive liposomes was achieved in a mouse tumor model of human glioblastoma (U87), resulting in a significant increase in efficacy when compared to nontriggered or nonthermosensitive PEGylated liposomes. This enhancement in efficacy is attributed to increase in tumor-site apoptosis, as was evident from noninvasive apoptosis imaging using Annexin-Vivo 750 probe. This strategy affords remotely triggered control of tumor dosing of nanocarrier-encapsulated doxorubicin without sacrificing the ability to differentially dose drugs to tumors via the enhanced permeation and retention effect.
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Affiliation(s)
- Abhiruchi Agarwal
- Neurological Biomaterials and Cancer Therapeutics Laboratory, Wallace H Coulter Department of Biomedical Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332, United States
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133
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Zhang XX, McIntosh TJ, Grinstaff MW. Functional lipids and lipoplexes for improved gene delivery. Biochimie 2011; 94:42-58. [PMID: 21621581 DOI: 10.1016/j.biochi.2011.05.005] [Citation(s) in RCA: 89] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2011] [Accepted: 05/06/2011] [Indexed: 12/17/2022]
Abstract
Cationic lipids are the most common non-viral vectors used in gene delivery with a few currently being investigated in clinical trials. However, like most other synthetic vectors, these vectors suffer from low transfection efficiencies. Among the various approaches to address this challenge, functional lipids (i.e., lipids responding to a stimuli) offer a myriad of opportunities for basic studies of nucleic acid-lipid interactions and for in vitro and in vivo delivery of nucleic acid for a specific biological/medical application. This manuscript reviews recent advances in pH, redox, and charge-reversal sensitive lipids.
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Affiliation(s)
- Xiao-Xiang Zhang
- Department of Chemistry, Boston University, Boston, MA 02215, USA
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134
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Xing L, Zheng H, Che S. A pH-responsive cleavage route based on a metal-organic coordination bond. Chemistry 2011; 17:7271-5. [PMID: 21567490 DOI: 10.1002/chem.201003005] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2010] [Indexed: 11/07/2022]
Abstract
The physical or chemical event that generally causes stimuli responses is limited to the formation or destruction of secondary forces, such as hydrogen bonding, hydrophobic effects, electrostatic interactions, and simple reactions. Here, pH-responsive behavior of metal-organic coordination bonding, which is intrinsic to natural systems (e.g., transferrin recycling in cells), is becoming a strong candidate for a new stimulus-responsive route. We have designed a simple pH-responsive release system by integrating a metal ion and ligand or self-assembling these species with biodegradable host molecules to form nanoparticles with "metal-ligand" or "host-metal-ligand" architectures. The cleavage of either or both the "metal-ligand" or the "host-metal" coordination bond in response to pH variations causes significant damage to the nanoparticles and the subsequent release of ligand molecules under designated pH conditions.
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Affiliation(s)
- Lei Xing
- School of Chemistry and Chemical Engineering, State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai, 200240, PR China
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135
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Leung SJ, Kachur XM, Bobnick MC, Romanowski M. Wavelength-Selective Light-Induced Release from Plasmon Resonant Liposomes. ADVANCED FUNCTIONAL MATERIALS 2011; 21:1113-1121. [PMID: 21796268 PMCID: PMC3142818 DOI: 10.1002/adfm.201002373] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
Biodegradable, spectrally tunable plasmon resonant nanocapsules are created via the deposition of gold onto the surface of 100 nm diameter thermosensitive liposomes. These nanocapsules demonstrate selective release of encapsulated contents upon illumination with light of a wavelength matching their distinct resonance bands, which correspond to 760 and 1210 nm in this study. Spectrally selective release is accomplished through the use of multiple, low intensity laser pulses delivered over a period of less than four minutes, ensuring that illumination affects only the gold-coated liposomes and avoids heating the surrounding media. The result of this illumination scheme for selective release using multiple wavelengths of light is a biologically safe mechanism for realizing drug delivery, microfluidic, and sensor applications.
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136
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Zhang S, Zhao Y. Controlled Release from Cleavable Polymerized Liposomes upon Redox and pH Stimulation. Bioconjug Chem 2011; 22:523-8. [DOI: 10.1021/bc1003197] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Shiyong Zhang
- Department of Chemistry, Iowa State University, Ames, Iowa 50011-3111, United States
| | - Yan Zhao
- Department of Chemistry, Iowa State University, Ames, Iowa 50011-3111, United States
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137
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138
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Ma Y, Zhou L, Zheng H, Xing L, Li C, Cui J, Che S. pH-responsive mitoxantrone (MX) delivery using mesoporous silica nanoparticles (MSN). ACTA ACUST UNITED AC 2011. [DOI: 10.1039/c1jm10750j] [Citation(s) in RCA: 49] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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139
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Andresen TL, Thompson DH, Kaasgaard T. Enzyme-triggered nanomedicine: drug release strategies in cancer therapy. Mol Membr Biol 2010; 27:353-63. [PMID: 20939771 DOI: 10.3109/09687688.2010.515950] [Citation(s) in RCA: 123] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
Nanomedicine as a field has emerged from the early success of nanoparticle-based drug delivery systems, in particular for treatment of cancer, and the advances made in nano- and biotechnology over the past decade. A prerequisite for nanoparticle-based drug delivery systems to be effective is that the drug payload is released at the target site. A large number of drug release strategies have been proposed that can be classified into certain areas. The simplest and most successful strategy so far, probably due to relative simplicity, is based on utilizing certain physico-chemical characteristics of drugs to obtain a slow drug leakage from the formulations after accumulation in the cancerous site. However, this strategy is only applicable to a relatively small range of drugs and cannot be applied to biologicals. Many advanced drug release strategies have therefore been investigated. Such strategies include utilization of heat, light and ultrasound sensitive systems and in particular pH sensitive systems where the lower pH in endosomes induces drug release. Highly interesting are enzyme sensitive systems where over-expressed disease-associated enzymes are utilized to trigger drug release. The enzyme-based strategies are particularly interesting as they require no prior knowledge of the tumour localization. The basis of this review is an evaluation of the current status of drug delivery strategies focused on triggered drug release by disease-associated enzymes. We limit ourselves to reviewing the liposome field, but the concepts and conclusions are equally important for polymer-based systems.
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Affiliation(s)
- Thomas L Andresen
- Technical University of Denmark, DTU Nanotech, Department of Micro- and Nanotechnology, Roskilde, Denmark.
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140
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Sánchez M, Aranda FJ, Teruel JA, Ortiz A. New pH-sensitive liposomes containing phosphatidylethanolamine and a bacterial dirhamnolipid. Chem Phys Lipids 2010; 164:16-23. [PMID: 20932963 DOI: 10.1016/j.chemphyslip.2010.09.008] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2010] [Revised: 09/20/2010] [Accepted: 09/27/2010] [Indexed: 10/19/2022]
Abstract
Phosphatidylethanolamine-based pH-sensitive liposomes of various compositions have been described as efficient systems for cytoplasmic delivery of molecules into cells. Incorporation of an amphiphile of appropriate structure is needed for the stabilization and performance of these vesicles. Among the wide variety of interesting activities displayed by Pseudomonas aeruginosa dirhamnolipids (diRL), is their capacity to stabilize bilayer structures in phosphatidylethanolamine systems. In this work, X-ray scattering, dynamic light scattering, fluorescence spectroscopy and fluorescence microscopy have been used to study the structure and pH-dependent behaviour of phosphatidylethanolamine/diRL liposomes. We show that diRL, in combination with dioleoylphosphatidylethanolamine (DOPE), forms stable multilamellar and unilamellar liposomes. Acidification of DOPE/diRL vesicles leads to membrane destabilization, fusion, and release of entrapped aqueous vesicle contents. Finally, DOPE/diRL pH-sensitive liposomes act as efficient vehicles for the cytoplasmic delivery of fluorescent probes into cultured cells. It is concluded that DOPE/diRL form stable pH-sensitive liposomes, and that these liposomes are incorporated into cultured cells through the endocytic pathway, delivering its contents into the cytoplasm, which means a potential use of these liposomes for the delivery of foreign substances into living cells. Our results establish a new application of diRL as a bilayer stabilizer in phospholipid vesicles, and the use of diRL-containing pH-sensitive liposomes as delivery vehicles.
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Affiliation(s)
- Marina Sánchez
- Department of Biochemistry and Molecular Biology-A, Veterinary Faculty, University of Murcia, Campus de Espinardo, E-30100 Murcia, Spain
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141
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Zhang J, Feng K, Cuddihy M, Kotov NA, Ma PX. Spontaneous formation of temperature-responsive assemblies by molecular recognition of a β-cyclodextrin containing block copolymer and poly(N-isopropylacrylamide). SOFT MATTER 2010; 6:3669-3679. [PMID: 20657806 PMCID: PMC2907537 DOI: 10.1039/c000898b] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/10/2023]
Abstract
We report the construction of novel temperature-responsive assemblies based on a double hydrophilic block copolymer (consisting of a PEG block and a β-cyclodextrin-containing block, PEG-b-PCD) and poly(N-isopropylacrylamide) (PNIPAm). Thus formed nano-assemblies exhibit a spherical morphology and have a temperature-responsive loose core. The driving force for the formation of these assemblies was found to be the inclusion complexation interaction between the hydrophobic cavity of β-cyclodextrin and the isopropyl group of PNIPAm. The particle size of these assemblies changed reversibly in response to the external temperature change. The particle size also changed with the PNIPAm/PEG-b-PCD weight ratio. A model hydrophobic drug (indomethacin) was loaded into these assemblies with a high efficiency. An in vitro release study showed that the payload could be released in a sustained manner after an initial burst release. The release rate could be switched between high and low in an ON/OFF fashion by temperature. These results demonstrate that the nano-assemblies have high potential for applications in controlled drug delivery and biomedicine when temperature responsiveness is desired.
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Affiliation(s)
- Jianxiang Zhang
- Department of Biologic and Materials Sciences, University of Michigan, Ann Arbor, MI 48109, USA
| | - Kai Feng
- Macromolecular Science and Engineering Center, University of Michigan, Ann Arbor, MI 48109, USA
| | - Meghan Cuddihy
- Department of Chemical Engineering, University of Michigan, Ann Arbor, MI 48109, USA
| | - Nicholas A. Kotov
- Department of Chemical Engineering, University of Michigan, Ann Arbor, MI 48109, USA
| | - Peter X Ma
- Department of Biologic and Materials Sciences, University of Michigan, Ann Arbor, MI 48109, USA
- Macromolecular Science and Engineering Center, University of Michigan, Ann Arbor, MI 48109, USA
- Department of Biomedical Engineering, University of Michigan, Ann Arbor, MI 48109, USA
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142
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Phoeung T, Aubron P, Rydzek G, Lafleur M. pH-triggered release from nonphospholipid LUVs modulated by the pKa of the included fatty acid. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2010; 26:12769-12776. [PMID: 20666419 DOI: 10.1021/la1014829] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
It has been shown that mixtures of palmitic acid (PA) and cholesterol (Chol) or cholesterol sulfate (Schol) can form fluid bilayers. These bilayers could be extruded using standard extrusion techniques to obtain nonphospholipid large unilamellar vesicles (LUVs). These LUVs displayed a very limited passive permeability, associated with their high sterol content (typically 70 mol %). In addition, they showed a pH-dependent behavior dictated by the electrostatic interfacial interactions, which are drastically modulated by the protonation state of PA. Interestingly, the LUVs prepared with cholesterol were stable at high pH and the release of the content could be triggered by a pH decrease (i.e., the protonation of PA). In contrast, the LUVs including Schol were stable at low pH and a pH increase (leading to the deprotonation of PA) would induce the release. In the present study, we demonstrate that the pH triggering the release in these two systems can be dictated in a predictable manner by selecting a fatty acid with an appropriate pK(a). The pK(a) of the fatty acids was modulated by the presence of an electro-withdrawing group (hydroxyl or fluoro) in the alpha position of the carboxylic function. The fatty acid protonation state is shown to be a critical factor for the modulation of the liposome permeability. The described systems display a remarkable versatility regarding the pH-sensitivity because the nature of the sterol controls the overall pH stability of the LUVs while the fatty acid pK(a) fine-tunes the pH-induced release. Therefore, it is possible to rationally design LUVs with controlled release at a specific pH; this original aspect is beneficial to the use of LUVs for encapsulation, vectorization, and controlled release of active agents.
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Affiliation(s)
- Thida Phoeung
- Department of Chemistry, Center for Self-Assembled Chemical Structures, Université de Montréal, C.P. 6128, Succ. Centre Ville, Montréal, Québec, Canada, H3C 3J7
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143
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Krishnan KM. Biomedical Nanomagnetics: A Spin Through Possibilities in Imaging, Diagnostics, and Therapy. IEEE TRANSACTIONS ON MAGNETICS 2010; 46:2523-2558. [PMID: 20930943 PMCID: PMC2949969 DOI: 10.1109/tmag.2010.2046907] [Citation(s) in RCA: 337] [Impact Index Per Article: 24.1] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/17/2023]
Abstract
Biomedical nanomagnetics is a multidisciplinary area of research in science, engineering and medicine with broad applications in imaging, diagnostics and therapy. Recent developments offer exciting possibilities in personalized medicine provided a truly integrated approach, combining chemistry, materials science, physics, engineering, biology and medicine, is implemented. Emphasizing this perspective, here we address important issues for the rapid development of the field, i.e., magnetic behavior at the nanoscale with emphasis on the relaxation dynamics, synthesis and surface functionalization of nanoparticles and core-shell structures, biocompatibility and toxicity studies, biological constraints and opportunities, and in vivo and in vitro applications. Specifically, we discuss targeted drug delivery and triggered release, novel contrast agents for magnetic resonance imaging, cancer therapy using magnetic fluid hyperthermia, in vitro diagnostics and the emerging magnetic particle imaging technique, that is quantitative and sensitive enough to compete with established imaging methods. In addition, the physics of self-assembly, which is fundamental to both biology and the future development of nanoscience, is illustrated with magnetic nanoparticles. It is shown that various competing energies associated with self-assembly converge on the nanometer length scale and different assemblies can be tailored by varying particle size and size distribution. Throughout this paper, while we discuss our recent research in the broad context of the multidisciplinary literature, we hope to bridge the gap between related work in physics/chemistry/engineering and biology/medicine and, at the same time, present the essential concepts in the individual disciplines. This approach is essential as biomedical nanomagnetics moves into the next phase of innovative translational research with emphasis on development of quantitative in vivo imaging, targeted and triggered drug release, and image guided therapy including validation of delivery and therapy response.
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Affiliation(s)
- Kannan M Krishnan
- Department of Materials Science, University of Washington, Seattle, WA 98195-2120 USA
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144
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Susa M, Milane L, Amiji MM, Hornicek FJ, Duan Z. Nanoparticles: A Promising Modality in the Treatment of Sarcomas. Pharm Res 2010; 28:260-72. [DOI: 10.1007/s11095-010-0173-z] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2010] [Accepted: 05/13/2010] [Indexed: 12/27/2022]
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145
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Abstract
One of the bottlenecks to achieve gene or drug delivery to cells is the spatio-temporal release of the cargo to effect the correct task wherever and whenever it is supposed to. The aim of this chapter is to describe the synthesis and properties of lipids, which can form liposome complexes with DNA and to fall apart in slight acidic condition such as those encountered in the late endosome, thus destabilizing the liposome membrane and releasing their content.
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Affiliation(s)
- Michel Bessodes
- Unité de Pharmacologie Chimique et Génétique, Inserm, U640, Paris, France
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146
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Karve S, Bandekar A, Ali MR, Sofou S. The pH-dependent association with cancer cells of tunable functionalized lipid vesicles with encapsulated doxorubicin for high cell-kill selectivity. Biomaterials 2010; 31:4409-16. [PMID: 20189243 DOI: 10.1016/j.biomaterials.2010.01.064] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2009] [Accepted: 01/12/2010] [Indexed: 10/19/2022]
Abstract
To enable selective cell-kill, we designed functionalized lipid vesicles with pH-triggered heterogeneous membranes and encapsulated doxorubicin that exhibit tunable surface topography. These vesicles "hide" (mask) the targeting ligands from their surface during circulation in the blood, and only progressively "expose" these ligands as they gradually penetrate deeper into the tumor interstitium, where after endocytosis they burst release their contents. The stimulus to activate the binding reactivity is the pH gradient between the blood stream (pH 7.4-7.0) and the increasingly acidic pH inside the tumor interstitium (pH 6.7-6.5). Doxorubicin release is activated at the endosomal pH 5.5-5.0. We show that tunable functionalized vesicles exhibit environmentally-dependent (pH-dependent) association with cancer cells resulting in high cell-kill selectivity. When lowering the extracellular pH from 7.4 to 6.5, tunable functionalized vesicles deliver doxorubicin to cancer cells that increases from 41% to 93% of maximum resulting in cancer cell killing that increases from 23 to 71% of maximum, respectively. This proof-of-concept shows the potential of tunable targeted liposomal chemotherapy to selectively kill cancer cells in an environmentally-dependent way.
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Affiliation(s)
- Shrirang Karve
- Chemical and Biological Engineering, Polytechnic Institute of NYU, 6 MetroTech Center, Brooklyn, NY 11201, USA
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147
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Abstract
Abstract
Objectives
The aim of this review was to examine gene therapy involving DNAzyme and siRNA encapsulation into chitosan nanoparticles, discussing the current and future status of this drug delivery system in enhancing drug delivery and cancer therapy.
Key findings
Cancer is a disease state in which the cells in our body undergo mutations at the genetic level and are transformed, acquiring the ability to replicate limitlessly. Conventional cancer treatment involves the use of surgery and cytotoxic chemotherapy and/or radiotherapy, which have the potential of harming normal, otherwise healthy, non-neoplastic cells. Newer forms of therapy such as immunotherapy and gene therapy have shown initial promise, but still require better ways to limit exposure to cancerous lesions in the body. As a result drug delivery systems have been developed in attempts to deliver therapeutics specifically to the target lesion site. One recent drug delivery system has revolved around the use of chitosan nanoparticle technology, where therapeutics are encapsulated into nanoparticles and targeted to tumours.
Summary
Though few, attempts at encapsulating therapeutics such as deoxyribozymes and small or short interfering RNA have been optimistic and encouraging.
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Affiliation(s)
- Mei Lin Tan
- Departments of Orthopaedics and Surgery, University of Melbourne, St Vincent's Hospital Melbourne, P.O. Box 2900, Fitzroy 3065, Australia
| | - Peter F M Choong
- Departments of Orthopaedics and Surgery, University of Melbourne, St Vincent's Hospital Melbourne, P.O. Box 2900, Fitzroy 3065, Australia
| | - Crispin R Dass
- Departments of Orthopaedics and Surgery, University of Melbourne, St Vincent's Hospital Melbourne, P.O. Box 2900, Fitzroy 3065, Australia
- Bone and Soft Tissue Sarcoma Service, Peter MacCallum Cancer Institute, Melbourne, Australia
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Tan ML, Choong PFM, Dass CR. Review: doxorubicin delivery systems based on chitosan for cancer therapy. J Pharm Pharmacol 2010. [DOI: 10.1211/jpp.61.02.0001] [Citation(s) in RCA: 82] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
Abstract
Objectives
This review sheds insight into an increasingly popular polymer that has been widely explored as a potential drug delivery system. The abundant, biodegradable and biocompatible polysaccharide chitosan, with many other favourable properties, has been favoured as a drug delivery system for the purposes of encapsulating and delivery of doxorubicin with reduced side-effects.
Key findings
Doxorubicin is frequently used as a frontline chemotherapeutic agent against a variety of cancers. It has largely been able to demonstrate anti-tumour effects, though there are major shortfalls of doxorubicin, which include serious side-effects such as cardiomyopathy and myelosuppression, and also an ever-present danger of extravasation during drug administration. In view of this, drug delivery systems are currently being explored as alternative methods of drug delivery in a bid to more effectively direct doxorubicin to the specific lesion site and reduce its systemic side-effects. Liposomes and dendrimers have been tested as potential carriers for doxorubicin; however they are not the focus of this review.
Summary
Recent advancements in doxorubicin and chitosan technology have shown some preliminary though promising results for cancer therapy.
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Affiliation(s)
- Mei Lin Tan
- Departments of Orthopaedics and Surgery, University of Melbourne, St Vincent's Hospital Melbourne, Melbourne, Australia
| | - Peter F M Choong
- Departments of Orthopaedics and Surgery, University of Melbourne, St Vincent's Hospital Melbourne, Melbourne, Australia
- Bone and Soft Tissue Sarcoma Service, Peter MacCallum Cancer Institute, Melbourne, Australia
| | - Crispin R Dass
- Departments of Orthopaedics and Surgery, University of Melbourne, St Vincent's Hospital Melbourne, Melbourne, Australia
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Akamatsu K. Development of a thermal neutron-sensitive liposome for a novel drug delivery system aiming for radio-chemo-concurrent cancer therapy. Radiat Phys Chem Oxf Engl 1993 2009. [DOI: 10.1016/j.radphyschem.2009.07.007] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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150
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Karve S, Alaouie A, Zhou Y, Rotolo J, Sofou S. The use of pH-triggered leaky heterogeneities on rigid lipid bilayers to improve intracellular trafficking and therapeutic potential of targeted liposomal immunochemotherapy. Biomaterials 2009; 30:6055-64. [DOI: 10.1016/j.biomaterials.2009.07.038] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2009] [Accepted: 07/22/2009] [Indexed: 11/24/2022]
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