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Kure T, Ochiai R, Sakai H. Stability of Liposomal Membrane of Hemoglobin-Vesicles (Artificial Red Cells) for Over Years of Storage Evaluated Using Liquid Chromatography-Mass Spectrometry. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2024; 40:12264-12275. [PMID: 38804272 DOI: 10.1021/acs.langmuir.4c01403] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2024]
Abstract
Hemoglobin-Vesicles (Hb-V) are artificial oxygen carriers encapsulating a purified and concentrated Hb solution in liposomes composed of 1,2-dipalmitoyl-sn-glycero-3-phosphatidylcholine (DPPC), cholesterol, 1,5-O-dihexadecyl-N-succinyl-l-glutamate (DHSG), and 1,2-distearoyl-sn-glycero-3-phosphatidylethanolamine-N-poly(ethylene glycol) (PEG5000) (DSPE-PEG). The safety and efficacy of Hb-V have been studied extensively by both preclinical and clinical test methods. Deoxygenation of Hb-V prevents autoxidation of Hb and can extend its shelf life to 2 years at room temperature. However, the lipid components raise concerns about hydrolysis because Hb-V is dispersed in saline. For this study, we attempted to estimate the lipid degradation of long-term stored Hb-V using liquid chromatography-mass spectrometry. Analyses of lipid components extracted from the stored Hb-V showed that the degradation increased depending on the storage temperature. The calculated % remaining of intact lipids of Hb-V were 98.1% after 4 years and 90.4% after 7.2 years at 4 °C, 95.8% after 1 year and 86.7% after 2 years at 25 °C, and 85.6% after 6 months at 40 °C. The main degradation products were lyso-PC and palmitic acid which are hydrolyzed at the ester bond of DPPC. A few hydrolyzed products of DHSG and DSPE-PEG were also detected in Hb-V, but almost no degradation or oxidation products derived from cholesterol could be identified. A shear test of Hb-V at 1500 s-1 showed no significant increase in Hb leakage after storage of 2 years at 25 °C and 6 months at 40 °C. Lipid degradation products including free fatty acids would decrease the pH of the Hb-V dispersion and synergistically facilitate degradation, but it maintained pH 6.5 during 6 years at 4 °C, 2 years at 25 °C, and 3 months at 40 °C because of its high buffering capacity. These results indicate that the storage conditions for Hb-V are appropriate to minimize lipid degradation in the long term.
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Affiliation(s)
- Tomoko Kure
- Department of Chemistry, Nara Medical University, 840 Shijo-cho, Kashihara 634-8521, Japan
| | - Ryosuke Ochiai
- Pharmaceuticals and Life Sciences Division, Shimadzu Techno-Research, Inc., Kyoto 604-8436, Japan
| | - Hiromi Sakai
- Department of Chemistry, Nara Medical University, 840 Shijo-cho, Kashihara 634-8521, Japan
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2
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Evasion of the accelerated blood clearance phenomenon by branched PEG lipid derivative coating of nanoemulsions. Int J Pharm 2022; 612:121365. [PMID: 34896215 DOI: 10.1016/j.ijpharm.2021.121365] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2021] [Revised: 11/28/2021] [Accepted: 12/06/2021] [Indexed: 11/23/2022]
Abstract
PEGylation increases the circulation time of the nanocarrier, but also triggers accelerated blood clearance (ABC) phenomenon. It is well-known that the ABC phenomenon results in shortened blood circulation and aberrant increase in liver and spleen accumulation, which greatly limits the application of PEGylated nano-preparations. For many years, researchers have been working hard to find ways to reduce or eliminate the ABC phenomenon. Previous studies have focused on PEG molecular weight and PEG alternative materials, but there has never been any research on the effect of different PEG chain types on the ABC phenomenon. Therefore, 40 kDa molecular weight of linear PEG lipid derivatives (DSPE-mPEG40k) and branched PEG lipid derivatives (DSPE-mPEG2,40k) were selected to modify nanoemulsions to explore the influence of distinct PEG chain types on avoiding the ABC phenomenon for the first time. We pioneer the use of linear and branched PEG lipid derivatives (DSPE-mPEG40k and DSPE-mPEG2,40k) to modify nanoemulsions (PE40k and PE2,40k). Upon characterization, PE40k and PE2,40k showed good physicochemical properties in the aspect of size, polydispersity index (PDI value), and zeta potential. Surprisingly, the pharmacokinetics study indicated that repeated injection of PE40k and PE2,40k did not trigger the ABC phenomenon. More importantly, PE2,40k possessed a long circulation time and did not cause ABC phenomenon after repeated injection. This may be attributed to the fact that PE2,40k induced noticeably lower anti-PEG IgM levels compared to linear PEG-modified nanocarriers and did not activate the complement system. Therefore, we speculate that DSPE-mPEG2,40k-modified nanocarriers possess promising prospects in avoiding the ABC phenomenon, which may improve the possibility of wide application of nanoformulations.
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3
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Zhang W, Callmann CE, Mirkin CA. Controlling the Biological Fate of Liposomal Spherical Nucleic Acids Using Tunable Polyethylene Glycol Shells. ACS APPLIED MATERIALS & INTERFACES 2021; 13:46325-46333. [PMID: 34547202 PMCID: PMC8590845 DOI: 10.1021/acsami.1c12852] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Liposomal spherical nucleic acids (LSNAs) modified with polyethylene glycol (PEG) units are studied in an attempt to understand how the circulation time and biodistribution of the constructs can be manipulated. Specifically, the effect of (1) PEG molecular weight, (2) PEG shell stability, and (3) PEG modification method (PEG in both the core and shell versus PEG in the shell only) on LSNA blood circulation, biodistribution, and in vivo cell internalization in a syngeneic, orthotopic triple-negative breast cancer mouse model is studied. Generally, high PEG molecular weight extends blood circulation lifetime, and a more lipophilic anchor stabilizes the PEG shell and improves circulation and tumor accumulation but at the cost of cell uptake efficiency. The PEGylation strategy has a minor effect on in vitro properties of LSNAs but significantly alters in vivo cell uptake. For example, surface-only PEG in one design contributed to higher in vivo cell internalization than its counterpart with PEG both in the shell and core. Taken together, this work provides guidelines for designing LSNAs that exhibit maximal in vivo cancer cell uptake characteristics in the context of a breast cancer model.
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Affiliation(s)
- Wuliang Zhang
- Department of Chemistry, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208, United States
- International Institute for Nanotechnology, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208, United States
| | - Cassandra E Callmann
- Department of Chemistry, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208, United States
- International Institute for Nanotechnology, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208, United States
| | - Chad A Mirkin
- Department of Chemistry, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208, United States
- International Institute for Nanotechnology, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208, United States
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4
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Vincent MP, Karabin NB, Allen SD, Bobbala S, Frey MA, Yi S, Yang Y, Scott EA. The Combination of Morphology and Surface Chemistry Defines the Immunological Identity of Nanocarriers in Human Blood. ADVANCED THERAPEUTICS 2021; 4:2100062. [PMID: 34485684 PMCID: PMC8411909 DOI: 10.1002/adtp.202100062] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2021] [Indexed: 12/13/2022]
Abstract
Upon exposure to blood, a corona of proteins adsorbs to nanocarrier surfaces to confer a biological identity that interfaces with the immune system. While the nanocarrier surface chemistry has long been the focus of protein corona formation, the influence of nanostructure has remained unclear despite established influences on biodistribution, clearance, and inflammation. Here, combinations of nanocarrier morphology and surface chemistry are engineered to i) achieve compositionally distinct protein coatings in human blood and ii) control protein-mediated interactions with the immune system. A library of nine PEGylated nanocarriers differing in their combination of morphology (spheres, vesicles, and cylinders) and surface chemistry (methoxy, hydroxyl, and phosphate) are synthesized to represent properties of therapeutic and biomimetic delivery vehicles. Analysis by quantitative label-free proteomic techniques reveal that specific surface chemistry and morphology combinations adsorb unique protein signatures from human blood, resulting in differential complement activation and elicitation of distinct proinflammatory cytokine responses. Furthermore, nanocarrier morphology is shown to primarily influence uptake and clearance by human monocytes, macrophages, and dendritic cells. This comprehensive analysis provides mechanistic insights into rational design choices that impact the immunological identity of nanocarriers in human blood, which can be leveraged to engineer drug delivery vehicles for precision medicine and immunotherapy.
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Affiliation(s)
- Michael P Vincent
- Department of Biomedical Engineering, Northwestern University, Evanston, IL 60208, USA
| | - Nicholas B Karabin
- Department of Biomedical Engineering, Northwestern University, Evanston, IL 60208, USA
| | - Sean D Allen
- Interdisciplinary Biological Sciences, Northwestern University, Evanston, IL 60208, USA
| | - Sharan Bobbala
- Department of Biomedical Engineering, Northwestern University, Evanston, IL 60208, USA
| | - Molly A Frey
- Interdisciplinary Biological Sciences, Northwestern University, Evanston, IL 60208, USA
| | - Sijia Yi
- Department of Biomedical Engineering, Northwestern University, Evanston, IL 60208, USA
| | - Yufan Yang
- Department of Biomedical Engineering, Northwestern University, Evanston, IL 60208, USA
| | - Evan A Scott
- Department of Biomedical Engineering, Northwestern University, Evanston, IL 60208, USA; Interdisciplinary Biological Sciences, Northwestern University, Evanston, IL 60208, USA; Chemistry of Life Processes Institute, Northwestern University, Evanston, IL 60208, USA; Simpson Querrey Institute, Robert H. Lurie Medical Research Center, Northwestern University, Chicago, IL 60611, USA; Robert H. Lurie Comprehensive Cancer Center, Northwestern University, Chicago, IL 60611, USA
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5
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Adler A, Inoue Y, Sato Y, Ishihara K, Ekdahl KN, Nilsson B, Teramura Y. Synthesis of poly(2-methacryloyloxyethyl phosphorylcholine)-conjugated lipids and their characterization and surface properties of modified liposomes for protein interactions. Biomater Sci 2021; 9:5854-5867. [PMID: 34286724 DOI: 10.1039/d1bm00570g] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Poly(ethylene glycol) (PEG) is frequently used for liposomal surface modification. However, as PEGylated liposomes are cleared rapidly from circulation upon repeated injections, substitutes of PEG are being sought. We focused on a water-soluble polymer composed of 2-methacryloyloxyethyl phosphorylcholine (MPC) units, and synthesized poly(MPC) (PMPC)-conjugated lipid (PMPC-lipid) with degrees of MPC polymerization ranging from 10 to 100 (calculated molecular weight: 3 to 30 kDa). In addition, lipids with three different alkyl chains, myristoyl, palmitoyl, and stearoyl, were applied for liposomal surface coating. We studied the interactions of PMPC-lipids with plasma albumin, human complement protein C3 and fibrinogen using a quartz crystal microbalance with energy dissipation, and found that adsorption of albumin, C3 and fibrinogen could be suppressed by coating with PMPC-lipids. In particular, the effect was more pronounced for PMPC chains with higher molecular weight. We evaluated the size, polydispersity index, surface charge, and membrane fluidity of the PMPC-lipid-modified liposomes. We found that the effect of the coating on the dispersion stability was maintained over a long period (98 days). Furthermore, we also demonstrated that the anti-PEG antibody did not interact with PMPC-lipids. Thus, our findings suggest that PMPC-lipids can be used for liposomal coating.
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Affiliation(s)
- Anna Adler
- Department of Immunology, Genetics and Pathology (IGP), Uppsala University, Dag Hammarskjölds väg 20, SE-751 85, Uppsala, Sweden.
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6
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Complement activation induced by PEG enhances humoral immune responses against antigens encapsulated in PEG-modified liposomes. J Control Release 2021; 329:1046-1053. [DOI: 10.1016/j.jconrel.2020.10.033] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2020] [Revised: 10/09/2020] [Accepted: 10/16/2020] [Indexed: 12/16/2022]
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7
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Juszkiewicz K, Sikorski AF, Czogalla A. Building Blocks to Design Liposomal Delivery Systems. Int J Mol Sci 2020; 21:E9559. [PMID: 33334048 PMCID: PMC7765547 DOI: 10.3390/ijms21249559] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2020] [Revised: 12/10/2020] [Accepted: 12/14/2020] [Indexed: 02/07/2023] Open
Abstract
The flexibility of liposomal carriers does not just simply rely on their capability to encapsulate various types of therapeutic substances, but also on the large array of components used for designing liposome-based nanoformulations. Each of their components plays a very specific role in the formulation and can be easily replaced whenever a different therapeutic effect is desired. It is tempting to describe this by an analogy to Lego blocks, since a whole set of structures, differing in their features, can be designed using a certain pool of blocks. In this review, we focus on different design strategies, where a broad variety of liposomal components facilitates the attainment of straightforward control over targeting and drug release, which leads to the design of the most promising systems for drug delivery. The key aspects of this block-based architecture became evident after its implementation in our recent works on liposomal carriers of antisense oligonucleotides and statins, which are described in the last chapter of this review.
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Affiliation(s)
- Katarzyna Juszkiewicz
- Department of Cytobiochemistry, Faculty of Biotechnology, University of Wroclaw, 50-383 Wroclaw, Poland;
| | - Aleksander F. Sikorski
- Research and Development Center, Regional Specialist Hospital, Kamieńskiego 73a, 51-124 Wroclaw, Poland;
| | - Aleksander Czogalla
- Department of Cytobiochemistry, Faculty of Biotechnology, University of Wroclaw, 50-383 Wroclaw, Poland;
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8
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Bunker A, Róg T. Mechanistic Understanding From Molecular Dynamics Simulation in Pharmaceutical Research 1: Drug Delivery. Front Mol Biosci 2020; 7:604770. [PMID: 33330633 PMCID: PMC7732618 DOI: 10.3389/fmolb.2020.604770] [Citation(s) in RCA: 41] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2020] [Accepted: 11/02/2020] [Indexed: 12/12/2022] Open
Abstract
In this review, we outline the growing role that molecular dynamics simulation is able to play as a design tool in drug delivery. We cover both the pharmaceutical and computational backgrounds, in a pedagogical fashion, as this review is designed to be equally accessible to pharmaceutical researchers interested in what this new computational tool is capable of and experts in molecular modeling who wish to pursue pharmaceutical applications as a context for their research. The field has become too broad for us to concisely describe all work that has been carried out; many comprehensive reviews on subtopics of this area are cited. We discuss the insight molecular dynamics modeling has provided in dissolution and solubility, however, the majority of the discussion is focused on nanomedicine: the development of nanoscale drug delivery vehicles. Here we focus on three areas where molecular dynamics modeling has had a particularly strong impact: (1) behavior in the bloodstream and protective polymer corona, (2) Drug loading and controlled release, and (3) Nanoparticle interaction with both model and biological membranes. We conclude with some thoughts on the role that molecular dynamics simulation can grow to play in the development of new drug delivery systems.
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Affiliation(s)
- Alex Bunker
- Division of Pharmaceutical Biosciences, Drug Research Program, Faculty of Pharmacy, University of Helsinki, Helsinki, Finland
| | - Tomasz Róg
- Department of Physics, University of Helsinki, Helsinki, Finland
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9
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Microfluidic production of protein loaded chimeric stealth liposomes. Int J Pharm 2020; 590:119955. [PMID: 33035609 DOI: 10.1016/j.ijpharm.2020.119955] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2020] [Revised: 09/30/2020] [Accepted: 10/03/2020] [Indexed: 02/06/2023]
Abstract
The addition of polyethylene glycol (PEG) on the surface of liposomes increases their circulation time when administered intravenously. However, the inclusion of PEG using PEGylated phospholipids could result in a possible micelles formation. The development of chimeric systems mixing synthetic biocompatible and biodegradable PEG-containing copolymers with lipids is a strategy to obtain as well PEGylated liposomes. Microfluidics is an innovative manufacturing technology easy to scale up that presents high reproducibility, low batch-to-batch variation, and better control over particles characteristics. Taking advantage of this technique, in this research work, chimeric stealth liposomes were produced mixing five different synthesized methoxy-poly(ethylene glycol)-block-poly(δ-decalactone) (mPEG-PDL, varying in polymer length) with 1,2-dimyristoyl-sn-glycero-3-phosphocholine (DMPC) and cholesterol. The obtained chimeric formulations were around 150 nm in size with a narrow distribution and an almost neutral surface charge. Ovalbumin (OVA) was used as a model protein to evaluate the loading potential reaching an encapsulation efficiency of 41 ± 4%. The prepared systems showed no cytotoxicity in vitro on THP-1 cell with an uptake up to 89 ± 4% after 3 h. Finally, protein integrity after encapsulation was confirmed with DQ-OVA. In this work, we demonstrated that using microfluidics, it is possible to produce stable and highly protein-loaded chimeric stealth liposomes with good physicochemical characteristics, no toxicity, protein integrity, and effective uptake by endocytosis.
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10
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Viana IMDO, Grenier P, Defrêne J, Barabé F, Lima EM, Bertrand N. Role of the complement cascade in the biological fate of liposomes in rodents. NANOSCALE 2020; 12:18875-18884. [PMID: 32901649 DOI: 10.1039/d0nr04100a] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/14/2023]
Abstract
Nanomedicines, including liposomes, have been used to improve the clinical efficacy and safety of drugs. In some liposomal formulations, a hydrophilic polymer coating of poly(ethylene glycol) (PEG) is used to increase the circulation time. Understanding the biological mechanisms responsible for the clearance of PEGylated and non-PEGylated nanomedicines is necessary to develop better-performing materials. The purpose of this work is to explore the role of complement in the elimination of intravenously administered liposomes (PEGylated and non-PEGylated) in mice and rats. Here, the complement cascade was depleted by intraperitoneal injections of cobra venom factor (CVF) 12 and 24 hours before the intravenous injection of radiolabeled liposomes. In both mice and rats, non-PEGylated liposomes showed faster elimination than PEGylated liposomes. At a lipid dose of 20 mg kg-1, the abrogation of the complement cascade (in CVF group) did not alter the circulation time of either PEGylated or non-PEGylated liposomes. In contrast, at lower doses (2 mg kg-1), animals treated with CVF had slightly higher levels of circulating liposomes, especially during the 24 hours pharmacokinetic studies. The complement cascade seems to govern the uptake of non-PEGylated liposomes by splenic B cells. Altogether, these results suggest that although PEGylated and non-PEGylated liposomes can activate complement, the impact of this cascade on their circulation time is minor and mostly perceivable at later phases of distribution. This work enlightens biological pathways responsible for in vivo clearance of liposomes and will help in orienting future research in elucidating the nano-bio interface.
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Affiliation(s)
- Iara Maíra de Oliveira Viana
- Laboratory of Pharmaceutical Technology (FarmaTec), Federal University of Goiás, Goiânia, 74605-220 Goiás, Brazil.
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11
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Wen L, Huang S, Du W, Zhu C, Xu H. Effects of the molecular weight and molar ratio of poly(2-ethyl-2-oxazoline)-based lipid on the pH sensitivity, stability, and antitumor efficacy of liposomes. Drug Dev Ind Pharm 2020; 46:283-295. [PMID: 31944130 DOI: 10.1080/03639045.2020.1717514] [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] [Indexed: 12/21/2022]
Abstract
In this study, we evaluated and screened the effects of the molecular weight (MW) and molar ratio of poly(2-ethyl-2-oxazoline)-cholesteryl methyl carbonate (PEtOz-CHMC) on the pH sensitivity, stability, and antitumor efficacy of liposomes. The pH sensitivity of PEtOz-CHMC with different MWs and molar ratios was screened by drug release and cytotoxicity experiments at different pH levels. Results indicated that the liposomes coated with PEtOz1k-CHMC (7% molar ratio) and PEtOz2k-CHMC (5% molar ratio) exhibited the desirable pH responsiveness. When the MW of PEtOz was relatively low, 7% of the modified ratio obtained the strongest stability, but the turbidity of the liposomes did not obviously change when the molar ratio of PEtOz-CHMC was further increased. A375 cells were used as models to investigate the cellular uptake and intracellular localization of coumarin-6-loaded liposomes (C6-L), PEGylated liposomes (PEG-C6-L), and PEtOzylated liposomes. PEtOz1k-C6-L and PEtOz2k-C6-L presented remarkably stronger fluorescence intensity at low pH than at pH 7.4, whereas C6-L and PEG-C6-L did not achieve any obvious diversity at different pH conditions. Compared with C6-L and PEG-C6-L, PEtOz-C6-L showed efficient intracellular trafficking, including endosomal/lysosomal escape and cytoplasmic release. Pharmacokinetic experiments demonstrated that half-lives of PEG2k-C6-L, PEtOz2k-C6-L, and PEtOz1k-C6-L were 11.89-, 7.00-, and 5.29-fold times higher than those of C6-L, respectively. Among the liposomes, the DOX·HCl-loaded liposomes coated with PEtOz2k-CHMC demonstrated the strongest antitumor efficacy against B16 tumor xenograft models in vivo. These findings provide the feasibility of using PEtOz-CHMC with optimal pH sensitivity and long circulation to extend the application of liposomes to efficient anticancer drug delivery.
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Affiliation(s)
- Luqiao Wen
- Department of Pharmacy, College of Chemistry and Chemical Engineering, Liaoning Normal University, Dalian, People's Republic of China
| | - Shouzhen Huang
- Department of Pharmacy, College of Chemistry and Chemical Engineering, Liaoning Normal University, Dalian, People's Republic of China
| | - Weiang Du
- Department of Pharmacy, College of Chemistry and Chemical Engineering, Liaoning Normal University, Dalian, People's Republic of China
| | - Caili Zhu
- Department of Pharmacy, College of Chemistry and Chemical Engineering, Liaoning Normal University, Dalian, People's Republic of China
| | - Huan Xu
- Department of Pharmacy, College of Chemistry and Chemical Engineering, Liaoning Normal University, Dalian, People's Republic of China
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12
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Bandara SR, Molley TG, Kim H, Bharath PA, Kilian KA, Leal C. The structural fate of lipid nanoparticles in the extracellular matrix. MATERIALS HORIZONS 2020; 7:125-134. [PMID: 31942243 PMCID: PMC6961836 DOI: 10.1039/c9mh00835g] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Drug-loaded liposomes are the most successful nanomedicine to date, with multiple FDA-approved systems for a myriad of diseases. While liposome circulation time in blood and retention in tissues have been studied in detail, the structural fate of liposomes-and nanoparticles in general-in the body has not been extensively investigated. Here, we explore the interactions of liposomes with synthetic and natural hydrogel materials to understand how the natural extracellular matrix influences liposome structural characteristics. Small angle X-ray scattering, confocal microscopy, and cryogenic transmission electron microscopy data demonstrate that poly(ethylene glycol) (PEG), gelatin, alginate, and Matrigel® hydrogels cause 200-nm liposomes of 1,2-dioleoyl-sn-glycero-3-phosphocholine (DOPC) to transform into micrometer-sized aggregates. These aggregates are composed of multilamellar vesicles around 100 nm in diameter with a mean interlamellar separation of 5.5 nm. Protecting the liposomes with a corona of PEG damps this restructuring effect, making the multilamellar vesicles less stable. We attribute this unilamellar to multilamellar transition to an osmotic driving force from the hydrogel environment. This lipid restructuring has broad ramifications in the design and use of nanomedicines, and in understanding the fate and function of natural lipid-based materials within the tissue microenvironment.
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Affiliation(s)
- Sarith R. Bandara
- Department of Materials Science and Engineering, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, United States
| | - Thomas G. Molley
- School of Chemistry, School of Materials Science and Engineering, Australian Centre for Nanomedicine, University of New South Wales, Sydney NSW 2052, Australia
| | - Hojun Kim
- Center for Biomaterials, Biomedical Research Institute, Korea Institute of Science and Technology (KIST), Seoul 02792, Republic of Korea
| | - Priyalini A. Bharath
- Department of Materials Science and Engineering, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, United States
| | - Kristopher A. Kilian
- School of Chemistry, School of Materials Science and Engineering, Australian Centre for Nanomedicine, University of New South Wales, Sydney NSW 2052, Australia
| | - Cecilia Leal
- Department of Materials Science and Engineering, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, United States
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Anchoring Property of a Novel Hydrophilic Lipopolymer, HDAS-SHP, Post-Inserted in Preformed Liposomes. NANOMATERIALS 2019; 9:nano9091185. [PMID: 31438526 PMCID: PMC6780652 DOI: 10.3390/nano9091185] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/15/2019] [Revised: 07/30/2019] [Accepted: 08/16/2019] [Indexed: 11/17/2022]
Abstract
Polyethylene glycol (PEG)-phospholipids in long-circulating liposomes cause non-specific immune reactions; mainly attributable to negatively-charged phosphoryl s at the interface of PEG and phospholipid. We investigated a novel lipopolymer, by which a superhydrophilic polymer (SHP) is conjugated to a non-phospholipid N1-(2-aminoethyl)-N4-hexadecyl-2-tetradecylsuccinamide (HDAS). The modification of preformed liposomes HDAS-SHP, HDAS-PEG2000, and DSPE-PEG2000 were performed by post-insertion techniques. The efficiency of post-insertion and desorption rates, from the liposome surface, were determined. HDAS-SHP micelles showed highly positive zeta potential (+28.4 mV); zeta potentials of DSPE-PEG2000 and HDAS-PEG2000 micelles were −34.4 mV, and −3.7 mV, respectively. Critical micelle concentration predicted amphiphilicity of HDAS-SHP (CMC 2.58 µM) as close to that of DSPE-PEG2000 (CMC 2.44 µM). Both HDAS-SHP and HDAS-PEG2000 post-inserted with comparable efficiency (79%, and 73%, respectively), but noticeably lower than DSPE-PEG2000 (90%). The desorption rate of HDAS-SHP was close to that of DSPE-PEG2000 (0.53%/h, and 0.45%/h, respectively); the desorption rate for HDAS-PEG2000 was slightly more at 0.67%/h. Compared to plain liposomes, both HDAS-SHP- and DSPE-PEG2000-liposomes showed significant leakage of encapsulated Na-fluorescein isothiocyanate (FITC) upon incubation with serum. At the same time, both modified liposomes were found to suppress serum levels of the complement proteins, Bb and C4d. We infer that HDAS-SHP is a viable alternative to commonly-used PEG-phospholipid derivatives for stealth purposes.
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14
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Liposome and immune system interplay: Challenges and potentials. J Control Release 2019; 305:194-209. [DOI: 10.1016/j.jconrel.2019.05.030] [Citation(s) in RCA: 76] [Impact Index Per Article: 15.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2019] [Revised: 05/15/2019] [Accepted: 05/17/2019] [Indexed: 01/20/2023]
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15
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A Promising Biocompatible Platform: Lipid-Based and Bio-Inspired Smart Drug Delivery Systems for Cancer Therapy. Int J Mol Sci 2018; 19:ijms19123859. [PMID: 30518027 PMCID: PMC6321581 DOI: 10.3390/ijms19123859] [Citation(s) in RCA: 34] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2018] [Revised: 11/29/2018] [Accepted: 12/02/2018] [Indexed: 02/06/2023] Open
Abstract
Designing new drug delivery systems (DDSs) for safer cancer therapy during pre-clinical and clinical applications still constitutes a considerable challenge, despite advances made in related fields. Lipid-based drug delivery systems (LBDDSs) have emerged as biocompatible candidates that overcome many biological obstacles. In particular, a combination of the merits of lipid carriers and functional polymers has maximized drug delivery efficiency. Functionalization of LBDDSs enables the accumulation of anti-cancer drugs at target destinations, which means they are more effective at controlled drug release in tumor microenvironments (TMEs). This review highlights the various types of ligands used to achieve tumor-specific delivery and discusses the strategies used to achieve the effective release of drugs in TMEs and not into healthy tissues. Moreover, innovative recent designs of LBDDSs are also described. These smart systems offer great potential for more advanced cancer therapies that address the challenges posed in this research area.
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Marlowe JL, Akopian V, Karmali P, Kornbrust D, Lockridge J, Semple S. Recommendations of the Oligonucleotide Safety Working Group's Formulated Oligonucleotide Subcommittee for the Safety Assessment of Formulated Oligonucleotide-Based Therapeutics. Nucleic Acid Ther 2017; 27:183-196. [PMID: 28609186 DOI: 10.1089/nat.2017.0671] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022] Open
Abstract
The use of lipid formulations has greatly improved the ability to effectively deliver oligonucleotides and has been instrumental in the rapid expansion of therapeutic development programs using oligonucleotide drugs. However, the development of such complex multicomponent therapeutics requires the implementation of unique, scientifically sound approaches to the nonclinical development of these drugs, based upon a hybrid of knowledge and experiences drawn from small molecule, protein, and oligonucleotide therapeutic drug development. The relative paucity of directly applicable regulatory guidance documents for oligonucleotide therapeutics in general has resulted in the generation of multiple white papers from oligonucleotide drug development experts and members of the Oligonucleotide Safety Working Group (OSWG). The members of the Formulated Oligonucleotide Subcommittee of the OSWG have utilized their collective experience working with a variety of formulations and their associated oligonucleotide payloads, as well as their insights into regulatory considerations and expectations, to generate a series of consensus recommendations for the pharmacokinetic characterization and nonclinical safety assessment of this unique class of therapeutics. It should be noted that the focus of Subcommittee discussions was on lipid nanoparticle and other types of particulate formulations of therapeutic oligonucleotides and not on conjugates or other types of modifications of oligonucleotide structure intended to facilitate delivery.
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Affiliation(s)
- Jennifer L Marlowe
- 1 Novartis Institutes for Biomedical Research , Cambridge, Massachusetts
| | | | | | | | | | - Sean Semple
- 6 Arbutus Biopharma Corporation , Burnaby, Canada
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Yorulmaz S, Jackman JA, Hunziker W, Cho NJ. Influence of membrane surface charge on adsorption of complement proteins onto supported lipid bilayers. Colloids Surf B Biointerfaces 2016; 148:270-277. [DOI: 10.1016/j.colsurfb.2016.08.036] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2016] [Revised: 07/29/2016] [Accepted: 08/21/2016] [Indexed: 10/21/2022]
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Deng Z, Wang X, Wang F, Qin Z, Cui Y, Sun Y, Sun L. Pharmacokinetics and tissue distribution study of 16-dehydropregnenolone liposome in female mice after intravenous administration. Drug Deliv 2016; 23:2787-2795. [DOI: 10.3109/10717544.2015.1088596] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Affiliation(s)
- Zhenxue Deng
- School of Pharmacy, Shenyang Pharmaceutical University, Shenyang, China and
| | - Xiaobo Wang
- School of Pharmacy, Shenyang Pharmaceutical University, Shenyang, China and
| | - Fang Wang
- School of Pharmacy, Shenyang Pharmaceutical University, Shenyang, China and
| | - Zheng Qin
- School of Pharmacy, Shenyang Pharmaceutical University, Shenyang, China and
| | - Yuqi Cui
- School of Traditional Chinese Materia Medica, Shenyang Pharmaceutical University, Shenyang, China
| | - Yangyang Sun
- School of Pharmacy, Shenyang Pharmaceutical University, Shenyang, China and
| | - Lixin Sun
- School of Pharmacy, Shenyang Pharmaceutical University, Shenyang, China and
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Bunker A, Magarkar A, Viitala T. Rational design of liposomal drug delivery systems, a review: Combined experimental and computational studies of lipid membranes, liposomes and their PEGylation. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2016; 1858:2334-2352. [DOI: 10.1016/j.bbamem.2016.02.025] [Citation(s) in RCA: 103] [Impact Index Per Article: 12.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/21/2015] [Revised: 02/09/2016] [Accepted: 02/10/2016] [Indexed: 01/22/2023]
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Majzoub RN, Ewert KK, Safinya CR. Cationic liposome-nucleic acid nanoparticle assemblies with applications in gene delivery and gene silencing. PHILOSOPHICAL TRANSACTIONS. SERIES A, MATHEMATICAL, PHYSICAL, AND ENGINEERING SCIENCES 2016; 374:20150129. [PMID: 27298431 PMCID: PMC4920278 DOI: 10.1098/rsta.2015.0129] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Accepted: 03/18/2016] [Indexed: 05/29/2023]
Abstract
Cationic liposomes (CLs) are synthetic carriers of nucleic acids in gene delivery and gene silencing therapeutics. The introduction will describe the structures of distinct liquid crystalline phases of CL-nucleic acid complexes, which were revealed in earlier synchrotron small-angle X-ray scattering experiments. When mixed with plasmid DNA, CLs containing lipids with distinct shapes spontaneously undergo topological transitions into self-assembled lamellar, inverse hexagonal, and hexagonal CL-DNA phases. CLs containing cubic phase lipids are observed to readily mix with short interfering RNA (siRNA) molecules creating double gyroid CL-siRNA phases for gene silencing. Custom synthesis of multivalent lipids and a range of novel polyethylene glycol (PEG)-lipids with attached targeting ligands and hydrolysable moieties have led to functionalized equilibrium nanoparticles (NPs) optimized for cell targeting, uptake or endosomal escape. Very recent experiments are described with surface-functionalized PEGylated CL-DNA NPs, including fluorescence microscopy colocalization with members of the Rab family of GTPases, which directly reveal interactions with cell membranes and NP pathways. In vitro optimization of CL-DNA and CL-siRNA NPs with relevant primary cancer cells is expected to impact nucleic acid therapeutics in vivo. This article is part of the themed issue 'Soft interfacial materials: from fundamentals to formulation'.
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Affiliation(s)
- Ramsey N Majzoub
- Department of Materials, University of California, Santa Barbara, CA 93106, USA Department of Physics, University of California, Santa Barbara, CA 93106, USA Molecular, Cellular and Developmental Biology Department, University of California, Santa Barbara, CA 93106, USA
| | - Kai K Ewert
- Department of Materials, University of California, Santa Barbara, CA 93106, USA Department of Physics, University of California, Santa Barbara, CA 93106, USA Molecular, Cellular and Developmental Biology Department, University of California, Santa Barbara, CA 93106, USA
| | - Cyrus R Safinya
- Department of Materials, University of California, Santa Barbara, CA 93106, USA Department of Physics, University of California, Santa Barbara, CA 93106, USA Molecular, Cellular and Developmental Biology Department, University of California, Santa Barbara, CA 93106, USA
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Nascimento TL, Hillaireau H, Vergnaud J, Fattal E. Lipid-based nanosystems for CD44 targeting in cancer treatment: recent significant advances, ongoing challenges and unmet needs. Nanomedicine (Lond) 2016; 11:1865-87. [DOI: 10.2217/nnm-2016-5000] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023] Open
Abstract
Extensive experimental evidence demonstrates the important role of hyaluronic acid (HA)-CD44 interaction in cell proliferation and migration, inflammation and tumor growth. Taking advantage of this interaction, the design of HA-modified nanocarriers has been investigated for targeting CD44-overexpressing cells with the purpose of delivering drugs to cancer or inflammatory cells. The effect of such modification on targeting efficacy is influenced by several factors. In this review, we focus on the impact of HA-modification on the characteristics of lipid-based nanoparticles. We try to understand how these modifications influence particle physicochemical properties, interaction with CD44 receptors, intracellular trafficking pathways, toxicity, complement/macrophage activation and pharmacokinetics. Our aim is to provide insight in tailoring particle modification by HA in order to design more efficient CD44-targeting lipid nanocarriers.
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Affiliation(s)
- Thais Leite Nascimento
- Institut Galien Paris-Sud, Faculté de pharmacie, Université Paris-Sud, 5 rue JB Clément, 92296 Châtenay-Malabry Cedex, France
- CNRS, UMR 8612, 5 rue JB Clément, 92296 Châtenay-Malabry Cedex, France
- CAPES Foundation, Ministry of Education of Brazil, Brasília – DF 70040-020, Brazil
| | - Hervé Hillaireau
- Institut Galien Paris-Sud, Faculté de pharmacie, Université Paris-Sud, 5 rue JB Clément, 92296 Châtenay-Malabry Cedex, France
- CNRS, UMR 8612, 5 rue JB Clément, 92296 Châtenay-Malabry Cedex, France
| | - Juliette Vergnaud
- Institut Galien Paris-Sud, Faculté de pharmacie, Université Paris-Sud, 5 rue JB Clément, 92296 Châtenay-Malabry Cedex, France
- CNRS, UMR 8612, 5 rue JB Clément, 92296 Châtenay-Malabry Cedex, France
| | - Elias Fattal
- Institut Galien Paris-Sud, Faculté de pharmacie, Université Paris-Sud, 5 rue JB Clément, 92296 Châtenay-Malabry Cedex, France
- CNRS, UMR 8612, 5 rue JB Clément, 92296 Châtenay-Malabry Cedex, France
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Yingchoncharoen P, Kalinowski DS, Richardson DR. Lipid-Based Drug Delivery Systems in Cancer Therapy: What Is Available and What Is Yet to Come. Pharmacol Rev 2016; 68:701-87. [PMID: 27363439 PMCID: PMC4931871 DOI: 10.1124/pr.115.012070] [Citation(s) in RCA: 433] [Impact Index Per Article: 54.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
Abstract
Cancer is a leading cause of death in many countries around the world. However, the efficacy of current standard treatments for a variety of cancers is suboptimal. First, most cancer treatments lack specificity, meaning that these treatments affect both cancer cells and their normal counterparts. Second, many anticancer agents are highly toxic, and thus, limit their use in treatment. Third, a number of cytotoxic chemotherapeutics are highly hydrophobic, which limits their utility in cancer therapy. Finally, many chemotherapeutic agents exhibit short half-lives that curtail their efficacy. As a result of these deficiencies, many current treatments lead to side effects, noncompliance, and patient inconvenience due to difficulties in administration. However, the application of nanotechnology has led to the development of effective nanosized drug delivery systems known commonly as nanoparticles. Among these delivery systems, lipid-based nanoparticles, particularly liposomes, have shown to be quite effective at exhibiting the ability to: 1) improve the selectivity of cancer chemotherapeutic agents; 2) lower the cytotoxicity of anticancer drugs to normal tissues, and thus, reduce their toxic side effects; 3) increase the solubility of hydrophobic drugs; and 4) offer a prolonged and controlled release of agents. This review will discuss the current state of lipid-based nanoparticle research, including the development of liposomes for cancer therapy, different strategies for tumor targeting, liposomal formulation of various anticancer drugs that are commercially available, recent progress in liposome technology for the treatment of cancer, and the next generation of lipid-based nanoparticles.
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Affiliation(s)
- Phatsapong Yingchoncharoen
- Molecular Pharmacology and Pathology Program, Department of Pathology, Faculty of Medicine, Bosch Institute, The University of Sydney, Sydney, NSW, Australia
| | - Danuta S Kalinowski
- Molecular Pharmacology and Pathology Program, Department of Pathology, Faculty of Medicine, Bosch Institute, The University of Sydney, Sydney, NSW, Australia
| | - Des R Richardson
- Molecular Pharmacology and Pathology Program, Department of Pathology, Faculty of Medicine, Bosch Institute, The University of Sydney, Sydney, NSW, Australia
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Avci P, Erdem SS, Hamblin MR. Photodynamic therapy: one step ahead with self-assembled nanoparticles. J Biomed Nanotechnol 2015; 10:1937-52. [PMID: 25580097 DOI: 10.1166/jbn.2014.1953] [Citation(s) in RCA: 50] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Photodynamic therapy (PDT) is a promising treatment modality for cancer with possible advantages over current treatment alternatives. It involves combination of light and a photosensitizer (PS), which is activated by absorption of specific wavelength light and creates local tissue damage through generation of reactive oxygen species (ROS) that induce a cascade of cellular and molecular events. However, as of today, PDT is still in need of improvement and nanotechnology may play a role. PDT frequently employs PS with molecular structures that are highly hydrophobic, water insoluble and prone to aggregation. Aggregation of PS leads to reduced ROS generation and thus lowers the PDT activity. Some PS such as 5-aminolevulinic acid (ALA) cannot penetrate through the stratum corneum of the skin and systemic administration is not an option due to frequently encountered side effects. Therefore PS are often encapsulated or conjugated in/on nano-drug delivery vehicles to allow them to be better taken up by cells and to more selectively deliver them to tumors or other target tissues. Several nano-drug delivery vehicles including liposomes, fullerosomes and nanocells have been tested and reviewed. Here we cover non-liposomal self-assembled nanoparticles consisting of polymeric micelles including block co-polymers, polymeric micelles, dendrimers and porphysomes.
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Li M, Qi S, Jin Y, Dong J. Self-assembled drug delivery systems. Part 8: In vitro / in vivo studies of the nanoassemblies of cholesteryl-phosphonyl gemcitabine. Int J Pharm 2015; 478:124-130. [DOI: 10.1016/j.ijpharm.2014.11.033] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2014] [Revised: 10/29/2014] [Accepted: 11/14/2014] [Indexed: 10/24/2022]
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Biodistribution and delivery efficiency of unmodified tumor-derived exosomes. J Control Release 2014; 199:145-55. [PMID: 25523519 DOI: 10.1016/j.jconrel.2014.12.013] [Citation(s) in RCA: 508] [Impact Index Per Article: 50.8] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2014] [Revised: 12/02/2014] [Accepted: 12/13/2014] [Indexed: 01/16/2023]
Abstract
The use of exosomes as a drug delivery vehicle has gained considerable interest. To establish if exosomes could be utilized effectively for drug delivery, a better understanding of their in vivo fate must be established. Through comparisons to liposomal formulations, which have been studied extensively for the last thirty years, we were able to make some comprehensive conclusions about the fate of unmodified tumor-derived exosomes in vivo. We observed a comparable rapid clearance and minimal tumor accumulation of intravenously-injected exosomes, PC:Chol liposomes, and liposomes formulated with the lipid extract of exosomes, suggesting that the unique protein and lipid composition of exosomes does not appreciably impact exosomes' rate of clearance and biodistribution. This rapid clearance along with minimal tumor accumulation of unmodified exosomes limits their use as an anti-cancer drug delivery vehicle; however, when delivered intratumorally, exosomes remained associated with tumor tissue to a significantly greater extent than PC:Chol liposomes. Furthermore, experiments utilizing mice with impaired adaptive or innate immune systems, revealed the significance of the innate immune system along with the complement protein C5 on exosomes' rate of clearance.
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Shielding of Lipid Nanoparticles for siRNA Delivery: Impact on Physicochemical Properties, Cytokine Induction, and Efficacy. MOLECULAR THERAPY. NUCLEIC ACIDS 2014; 3:e210. [PMID: 25405467 PMCID: PMC4459547 DOI: 10.1038/mtna.2014.61] [Citation(s) in RCA: 123] [Impact Index Per Article: 12.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/22/2014] [Accepted: 09/23/2014] [Indexed: 11/18/2022]
Abstract
Formulation of short interfering RNA (siRNA) into multicomponent lipid nanoparticles (LNP) is an effective strategy for hepatic delivery and therapeutic gene silencing. This study systematically evaluated the effect of polyethylene glycol (PEG) density on LNP physicochemical properties, innate immune response stimulation, and in vivo efficacy. Increased PEG density not only shielded LNP surface charge but also reduced hemolytic activity, suggesting the formation of a steric barrier. In addition, increasing the PEG density reduced LNP immunostimulatory potential as reflected in cytokine induction both in vivo and in vitro. Higher PEG density also hindered in vivo efficacy, presumably due to reduced association with apolipoprotein E (ApoE), a protein which serves as an endogenous targeting ligand to hepatocytes. This effect could be overcome by incorporating an exogenous targeting ligand into the highly shielded LNPs, thereby circumventing the requirement for ApoE association. Therefore, these studies provide useful information for the rational design of LNP-based siRNA delivery systems with an optimal safety and efficacy profile.
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Nichols JW, Bae YH. EPR: Evidence and fallacy. J Control Release 2014; 190:451-64. [DOI: 10.1016/j.jconrel.2014.03.057] [Citation(s) in RCA: 431] [Impact Index Per Article: 43.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2014] [Revised: 03/19/2014] [Accepted: 03/21/2014] [Indexed: 02/07/2023]
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He ZY, Chu BY, Wei XW, Li J, Edwards CK, Song XR, He G, Xie YM, Wei YQ, Qian ZY. Recent development of poly(ethylene glycol)-cholesterol conjugates as drug delivery systems. Int J Pharm 2014; 469:168-78. [DOI: 10.1016/j.ijpharm.2014.04.056] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2014] [Revised: 04/15/2014] [Accepted: 04/23/2014] [Indexed: 11/28/2022]
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Protein-based blood substitutes: recent attempts at controlling pro-oxidant reactivity with and beyond hemoglobin. Pharmaceuticals (Basel) 2013; 6:867-80. [PMID: 24276319 PMCID: PMC3816705 DOI: 10.3390/ph6070867] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2013] [Accepted: 06/26/2013] [Indexed: 12/03/2022] Open
Abstract
Reviewed here are recent attempts to produce protein-based artificial oxygen carriers (“blood substitutes”). Most of these involve chemical or physical modifications on hemoglobin, although a recent line of research using hemerythrin instead of hemoglobin is also described. The focus is set on the extent to which these modifications alter the redox reactivity of the proteins, and on ways in which this can be done systematically and purposefully, within the framework of a working hypothesis where redox side-reactions hold an important role in the physiological outcome of experimental transfusions with artificial oxygen carriers.
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Lin YY, Kao HW, Li JJ, Hwang JJ, Tseng YL, Lin WJ, Lin MH, Ting G, Wang HE. Tumor burden talks in cancer treatment with PEGylated liposomal drugs. PLoS One 2013; 8:e63078. [PMID: 23675454 PMCID: PMC3651236 DOI: 10.1371/journal.pone.0063078] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2013] [Accepted: 03/28/2013] [Indexed: 12/19/2022] Open
Abstract
Purpose PEGylated liposomes are important drug carriers that can passively target tumor by enhanced permeability and retention (EPR) effect in neoplasm lesions. This study demonstrated that tumor burden determines the tumor uptake, and also the tumor response, in cancer treatment with PEGylated liposomal drugs in a C26/tk-luc colon carcinoma-bearing mouse model. Methods Empty PEGylated liposomes (NanoX) and those encapsulated with VNB (NanoVNB) were labeled with In-111 to obtain InNanoX and InVNBL in high labeling yield and radiochemical purity (all >90%). BALB/c mice bearing either small (58.4±8.0 mm3) or large (102.4±22.0 mm3) C26/tk-luc tumors in the right dorsal flank were intravenously administered with NanoVNB, InNanoX, InVNBL, or NanoX as a control, every 7 days for 3 times. The therapeutic efficacy was evaluated by body weight loss, tumor growth inhibition (using calipers and bioluminescence imaging) and survival fraction. The scintigraphic imaging of tumor mouse was performed during and after treatment. Results The biodistribution study of InVNBL revealed a clear inverse correlation (r2 = 0.9336) between the tumor uptake and the tumor mass ranged from 27.6 to 623.9 mg. All three liposomal drugs showed better therapeutic efficacy in small-tumor mice than in large-tumor mice. Tumor-bearing mice treated with InVNBL (a combination drug) showed the highest tumor growth inhibition rate and survival fraction compared to those treated with NanoVNB (chemodrug only) and InNanoX (radionuclide only). Specific tumor targeting and significantly increased tumor uptake after periodical treatment with InVNBL were evidenced by scintigraphic imaging, especially in mice bearing small tumors. Conclusion The significant differences in the outcomes of cancer treatment and molecular imaging between animals bearing small and large tumors revealed that tumor burden is a critical and discriminative factor in cancer therapy using PEGylated liposomal drugs.
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Affiliation(s)
- Yi-Yu Lin
- Biomedical Imaging and Radiological Sciences, National Yang-Ming University, Taipei, Taiwan
| | - Hao-Wen Kao
- Biomedical Imaging and Radiological Sciences, National Yang-Ming University, Taipei, Taiwan
| | - Jia-Je Li
- Biomedical Imaging and Radiological Sciences, National Yang-Ming University, Taipei, Taiwan
| | - Jeng-Jong Hwang
- Biomedical Imaging and Radiological Sciences, National Yang-Ming University, Taipei, Taiwan
| | | | - Wuu-Jyh Lin
- Institute of Nuclear Energy Research, Taoyuan, Taiwan
| | | | - Gann Ting
- National Health Research Institutes, Miaoli, Taiwan
| | - Hsin-Ell Wang
- Biomedical Imaging and Radiological Sciences, National Yang-Ming University, Taipei, Taiwan
- * E-mail:
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van den Hoven JM, Nemes R, Metselaar JM, Nuijen B, Beijnen JH, Storm G, Szebeni J. Complement activation by PEGylated liposomes containing prednisolone. Eur J Pharm Sci 2013; 49:265-71. [DOI: 10.1016/j.ejps.2013.03.007] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2012] [Revised: 02/28/2013] [Accepted: 03/08/2013] [Indexed: 10/27/2022]
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Salmaso S, Caliceti P. Stealth properties to improve therapeutic efficacy of drug nanocarriers. JOURNAL OF DRUG DELIVERY 2013; 2013:374252. [PMID: 23533769 PMCID: PMC3606770 DOI: 10.1155/2013/374252] [Citation(s) in RCA: 194] [Impact Index Per Article: 17.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/02/2012] [Accepted: 02/06/2013] [Indexed: 12/23/2022]
Abstract
Over the last few decades, nanocarriers for drug delivery have emerged as powerful tools with unquestionable potential to improve the therapeutic efficacy of anticancer drugs. Many colloidal drug delivery systems are underdevelopment to ameliorate the site specificity of drug action and reduce the systemic side effects. By virtue of their small size they can be injected intravenously and disposed into the target tissues where they release the drug. Nanocarriers interact massively with the surrounding environment, namely, endothelium vessels as well as cells and blood proteins. Consequently, they are rapidly removed from the circulation mostly by the mononuclear phagocyte system. In order to endow nanosystems with long circulation properties, new technologies aimed at the surface modification of their physicochemical features have been developed. In particular, stealth nanocarriers can be obtained by polymeric coating. In this paper, the basic concept underlining the "stealth" properties of drug nanocarriers, the parameters influencing the polymer coating performance in terms of opsonins/macrophages interaction with the colloid surface, the most commonly used materials for the coating process and the outcomes of this peculiar procedure are thoroughly discussed.
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Affiliation(s)
- Stefano Salmaso
- Department of Pharmaceutical and Pharmacological Sciences, University of Padua, Via F. Marzolo 5, 35131 Padova, Italy
| | - Paolo Caliceti
- Department of Pharmaceutical and Pharmacological Sciences, University of Padua, Via F. Marzolo 5, 35131 Padova, Italy
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Nag OK, Yadav VR, Hedrick A, Awasthi V. Post-modification of preformed liposomes with novel non-phospholipid poly(ethylene glycol)-conjugated hexadecylcarbamoylmethyl hexadecanoic acid for enhanced circulation persistence in vivo. Int J Pharm 2013; 446:119-29. [PMID: 23419666 DOI: 10.1016/j.ijpharm.2013.02.026] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2012] [Revised: 01/03/2013] [Accepted: 02/11/2013] [Indexed: 10/27/2022]
Abstract
We report synthesis and characterization of a novel PEG2000-conjugated hexadecylcarbamoylmethyl hexadecanoate (HDAS-PEG) as a PEG-phospholipid substitute for enhancing circulation persistence of liposomes. HDAS-PEG showed critical micelle concentration of 4.25 μM. We used post-insertion technique to introduce HDAS-PEG in outer lipid layer of the preformed liposomes. The presence of surface HDAS-PEG was confirmed by altered electrophoretic mobility, confocal microscopy and PEG estimation by ELISA. The post-inserted HDAS-PEG desorbed at approximately half the rate at which post-inserted DSPE-PEG desorbed from the liposome surface. HDAS-PEG significantly reduced liposome-induced complement activation (C4d, Bb and SC5b); HDAS-PEG was more effective than more commonly used DSPE-PEG in this capacity. For studying circulation persistence, the liposomes were labeled with (99m)Tc radionuclide and administered in rats. (99m)Tc-HDAS-PEG-liposomes showed prolonged persistence in blood as compared to that shown by (99m)Tc-plain liposomes. After 24 h of administration, <1% of (99m)Tc-plain liposomes remained in blood, whereas approximately 28% of injected (99m)Tc-HDAS-PEG-liposomes were present in blood. In comparison, only 4.8% of (99m)Tc-DSPE-PEG-liposomes were measured in blood after 24 h. As expected, the clearance route of the liposomes was through liver and spleen. These results demonstrate the potential of a novel non-phosphoryl HDAS-PEG for surface modification of preformed liposomes with a goal of prolonging their circulation persistence and more effective inhibition of complement activation.
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Affiliation(s)
- Okhil K Nag
- Department of Pharmaceutical Sciences, College of Pharmacy, University of Oklahoma Health Sciences Center, 1110 North Stonewall Avenue, Oklahoma City, OK 73117, USA
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Sun C, Miao J, Yan J, Yang K, Mao C, Ju J, Shen J. Applications of antibiofouling PEG-coating in electrochemical biosensors for determination of glucose in whole blood. Electrochim Acta 2013. [DOI: 10.1016/j.electacta.2012.11.005] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Ho EA, Osooly M, Strutt D, Masin D, Yang Y, Yan H, Bally M. Characterization of long-circulating cationic nanoparticle formulations consisting of a two-stage PEGylation step for the delivery of siRNA in a breast cancer tumor model. J Pharm Sci 2012; 102:227-36. [PMID: 23132529 DOI: 10.1002/jps.23351] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2012] [Revised: 10/03/2012] [Accepted: 10/09/2012] [Indexed: 11/06/2022]
Abstract
Polyethylene glycol (PEG) has been used widely in liposomal formulations as a strategy to inhibit opsonization by plasma proteins and to prolong liposome plasma circulation time. PEG can be incorporated onto the surface of liposomes either during the spontaneous self-assembling process or inserted after vesicle formation. The advantages of employing the PEG postinsertion method include improved drug encapsulation efficiency and the ability to incorporate PEG conjugates for enhanced cell binding and uptake. In this study, we propose to evaluate a cationic lipid nanoparticle formulation containing two PEGylation steps: pre- and post-siRNA insertion. Our results indicate that formulations consisting of the extra PEG post-insertion step significantly increased siRNA circulation in the plasma by two-folds in comparison with the formulations consisting of only the single PEGylation step. Moreover, this formulation was able to efficiently carry siRNA to the tumor site, increase siRNA stability and significantly downregulate luciferase mRNA expression by >50% when compared with the controls in an intraperitoneal and subcutaneous breast cancer tumor model. Overall, our cationic lipid nanoparticle formulation displayed enhanced plasma circulation, reduced liver accumulation, enhanced tumor targeting, and effective gene knockdown--demonstrating excellent utility for the delivery of siRNA.
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Affiliation(s)
- Emmanuel A Ho
- University of Manitoba, Winnipeg, Manitoba, R3E 0T5, Canada.
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Jin Y, Lian Y, Du L, Wang S, Su C, Gao C. Self-assembled drug delivery systems. Part 6: In vitro/in vivo studies of anticancer N-octadecanoyl gemcitabine nanoassemblies. Int J Pharm 2012; 430:276-81. [DOI: 10.1016/j.ijpharm.2012.03.046] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2012] [Revised: 02/25/2012] [Accepted: 03/25/2012] [Indexed: 11/29/2022]
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Sakai H, Suzuki Y, Sou K, Kano M. Cardiopulmonary hemodynamic responses to the small injection of hemoglobin vesicles (artificial oxygen carriers) in miniature pigs. J Biomed Mater Res A 2012; 100:2668-77. [DOI: 10.1002/jbm.a.34208] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2012] [Revised: 04/03/2012] [Accepted: 04/04/2012] [Indexed: 01/03/2023]
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Kooijmans SAA, Vader P, van Dommelen SM, van Solinge WW, Schiffelers RM. Exosome mimetics: a novel class of drug delivery systems. Int J Nanomedicine 2012; 7:1525-41. [PMID: 22619510 PMCID: PMC3356169 DOI: 10.2147/ijn.s29661] [Citation(s) in RCA: 224] [Impact Index Per Article: 18.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
Abstract
The identification of extracellular phospholipid vesicles as conveyors of cellular information has created excitement in the field of drug delivery. Biological therapeutics, including short interfering RNA and recombinant proteins, are prone to degradation, have limited ability to cross biological membranes, and may elicit immune responses. Therefore, delivery systems for such drugs are under intensive investigation. Exploiting extracellular vesicles as carriers for biological therapeutics is a promising strategy to overcome these issues and to achieve efficient delivery to the cytosol of target cells. Exosomes are a well studied class of extracellular vesicles known to carry proteins and nucleic acids, making them especially suitable for such strategies. However, the considerable complexity and the related high chance of off-target effects of these carriers are major barriers for translation to the clinic. Given that it is well possible that not all components of exosomes are required for their proper functioning, an alternative strategy would be to mimic these vesicles synthetically. By assembly of liposomes harboring only crucial components of natural exosomes, functional exosome mimetics may be created. The low complexity and use of well characterized components strongly increase the pharmaceutical acceptability of such systems. However, exosomal components that would be required for the assembly of functional exosome mimetics remain to be identified. This review provides insights into the composition and functional properties of exosomes, and focuses on components which could be used to enhance the drug delivery properties of exosome mimetics.
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Affiliation(s)
- Sander A A Kooijmans
- Department of Clinical Chemistry and Haematology, University Medical Center Utrecht, Utrecht, The Netherlands
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Muppidi K, Pumerantz AS, Wang J, Betageri G. Development and stability studies of novel liposomal vancomycin formulations. ISRN PHARMACEUTICS 2012; 2012:636743. [PMID: 22500244 PMCID: PMC3302012 DOI: 10.5402/2012/636743] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/29/2011] [Accepted: 10/24/2011] [Indexed: 11/23/2022]
Abstract
A promising strategy to improve the therapeutic efficiency of antimicrobial agents is targeted therapy. Although vancomycin has been considered a gold standard for the therapy of MRSA pneumonia, clinical failure rates have also been reported owing to its slow, time-dependent bactericidal activity, variable lung tissue penetration and poor intracellular penetration into macrophages. Liposomal encapsulation has been established as an alternative for antimicrobial delivery to infected tissue macrophages and offers enhanced pharmacodynamics, pharmacokinetics and decreased toxicity compared to standard preparations. The aim of the present work is to prepare vancomycin in two different liposomal formulations, conventional and PEGylated liposomes using different methods. The prepared formulations were optimized for their particle size, encapsulation efficiency and physical stability. The dehydration-rehydration was found to be the best preparation method. Both the conventional and PEGylated liposomal formulations were successfully formulated with a narrow particle size and size distribution and % encapsulation efficiency of 9 ± 2 and 12 ± 3, respectively. Both the formulations were stable at 4°C for 3 months. These formulations were successfully used to evaluate for their intracellular killing of MRSA and in vivo pharmacokinetic and bio-distribution studies.
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Affiliation(s)
- Krishna Muppidi
- Department of Pharmaceutical Sciences, College of Pharmacy, Western University of Health Sciences, 309 E. 2nd Street, Pomona, CA 91766, USA
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Santos H, Bimbo L, Das Neves J, Sarmento B, INEB. Nanoparticulate targeted drug delivery using peptides and proteins. Nanomedicine (Lond) 2012. [DOI: 10.1533/9780857096449.2.236] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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Gao G, Lange D, Hilpert K, Kindrachuk J, Zou Y, Cheng JT, Kazemzadeh-Narbat M, Yu K, Wang R, Straus SK, Brooks DE, Chew BH, Hancock RE, Kizhakkedathu JN. The biocompatibility and biofilm resistance of implant coatings based on hydrophilic polymer brushes conjugated with antimicrobial peptides. Biomaterials 2011; 32:3899-909. [DOI: 10.1016/j.biomaterials.2011.02.013] [Citation(s) in RCA: 254] [Impact Index Per Article: 19.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2011] [Accepted: 02/09/2011] [Indexed: 01/18/2023]
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Improvement of Graft Survival by Surface Modification With Poly(ethylene glycol)-Lipid and Urokinase in Intraportal Islet Transplantation. Transplantation 2011; 91:271-8. [DOI: 10.1097/tp.0b013e3182034fa4] [Citation(s) in RCA: 61] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Karmali PP, Simberg D. Interactions of nanoparticles with plasma proteins: implication on clearance and toxicity of drug delivery systems. Expert Opin Drug Deliv 2011; 8:343-57. [PMID: 21291354 DOI: 10.1517/17425247.2011.554818] [Citation(s) in RCA: 236] [Impact Index Per Article: 18.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
INTRODUCTION Intravenously injected nanoparticles, like any other foreign pathogen that enters the body, encounter multiple lines of defense intended to neutralize and eliminate the invading substance. Adsorption of plasma proteins on the nanoparticle surface is the first barrier of defense, which could lead to physical changes in the formulation, such as aggregation and charge neutralization, biochemical activation of defense cascades, and trigger elimination by multiple types of phagocytic cell. AREAS COVERED In this review, recent knowledge on the mechanisms that govern the interactions of nanoparticles (micelles, liposomes, polymeric and inorganic nanoparticles) with plasma proteins is discussed. In particular, the role of the nanoparticle surface properties and protective polymer coating in these interactions is described. The mechanisms of protein adsorption on different nanoparticles are analyzed and the implications on the clearance, toxicity and efficacy of drug delivery are discussed. The review provides readers with the biological insight into the plasma/blood interactions of nanoparticles. EXPERT OPINION The immune recognition of nanoparticles can seriously affect the drug delivery efficacy and toxicity. There is at present not enough knowledge on the mechanisms that dictate the nanoparticle immune recognition and stability in the biological milieu. Understanding the mechanisms of recognition will become an important part of nanoparticle design.
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Affiliation(s)
- Priya Prakash Karmali
- Sanford-Burnham Medical Research Institute, Cancer Research Center, La Jolla, CA 92037, USA
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Sakuragi M, Koiwai K, Nakamura K, Masunaga H, Ogawa H, Sakurai K. Transformation from Multilamellar to Unilamellar Vesicles by Addition of a Cationic Lipid to PEGylated Liposomes Explored with Synchrotron Small Angle X-ray Scattering. ACTA ACUST UNITED AC 2011. [DOI: 10.1088/1742-6596/272/1/012011] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Rameez S, Bamba I, Palmer AF. Large scale production of vesicles by hollow fiber extrusion: a novel method for generating polymersome encapsulated hemoglobin dispersions. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2010; 26:5279-85. [PMID: 20000689 PMCID: PMC2847677 DOI: 10.1021/la9036343] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
Vesicles, which include both liposomes and polymersomes (polymer vesicles), are being developed as therapeutic drug carriers. In this study, we present a fully scalable low pressure extrusion methodology for preparing vesicles. Vesicles were generated by continuous extrusion through a 200 nm pore diameter hollow fiber (HF) membrane. The first half of this study describes a method for generating empty polymersomes composed of different molecular weight amphiphilic poly(butadiene-b-ethylene oxide) (PBD-b-PEO) diblock copolymers on a large scale (50-100 mL) using a HF membrane. Monodisperse empty polymersomes were formed with particle diameters slightly less than 200 nm, which were close to the rated 200 nm pore size of the HF membrane. The second half of this study describes the successful encapsulation of hemoglobin (Hb) inside the aqueous core of polymersomes using the HF extrusion methodology. We demonstrate that polymersome encapsulated hemoglobin (PEH) particles formed by this technique had similar oxygen affinity, cooperativity coefficient, and methemoglobin (metHb) level compared to PEH particles formed by the 1 mL volume small scale manual extrusion method. Most notably, Hb encapsulation inside the polymer vesicles formed by the HF extrusion method increased 2-fold compared to the manual extrusion method. This work is important, since it will enable facile scale-up of homogeneous vesicle dispersions that are typically required for preclinical and clinical studies as well as industrial use.
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Affiliation(s)
- Shahid Rameez
- William G. Lowrie Department of Chemical and Biomolecular Engineering, The Ohio State University, 425 Koffolt Laboratories, 140 West 19 Avenue, Columbus, OH 43210
| | - Ibrahim Bamba
- William G. Lowrie Department of Chemical and Biomolecular Engineering, The Ohio State University, 425 Koffolt Laboratories, 140 West 19 Avenue, Columbus, OH 43210
| | - Andre F. Palmer
- William G. Lowrie Department of Chemical and Biomolecular Engineering, The Ohio State University, 425 Koffolt Laboratories, 140 West 19 Avenue, Columbus, OH 43210
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Liu Z, Janzen J, Brooks DE. Adsorption of amphiphilic hyperbranched polyglycerol derivatives onto human red blood cells. Biomaterials 2010; 31:3364-73. [PMID: 20122720 DOI: 10.1016/j.biomaterials.2010.01.021] [Citation(s) in RCA: 50] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2009] [Accepted: 01/08/2010] [Indexed: 11/26/2022]
Abstract
Hydrophobically derivatized hyperbranched polyglycerol (HPG)-polyethylene glycol (PEG) polymers bearing stearoyl chains (HPG-C18-PEG) were originally developed as human serum albumin substitutes and further as a unimolecular drug delivery system. In view of these in vivo applications and the potential for membrane interaction by these materials due to their amphiphilic structure, determining the adsorption of the polymers to human red blood cells (RBCs) is an important issue. This paper reports on the in vitro adsorption to RBCs of tritium-radiolabeled HPG-C18-PEG polymers. The morphological changes of RBCs associated with the adsorption were also examined by light and scanning electron microscopy (SEM). Laser scanning confocal microscopy (LSCM) suggests that the binding site of the polymers on RBCs is the cell membrane. Adsorption experiments show that, in the medium of either saline or plasma, the binding amount of the polymers to RBCs increases with increased polymer concentration in a manner which implies simple Langmurian behavior. The binding amount in saline is of the order of 10(5) molecules/cell at an equilibrium concentration of 1 mg/mL of HPG-C18-PEG polymer. The RBC morphology depends on the adsorbed amount; the cells become crenated in high concentrations (5 and 10 mg/mL) of the polymer solutions in the absence of plasma proteins. Interestingly, a large amount of polymers remain bound to RBCs even after washes with plasma (of the order of 10(4) molecules/cell). Thus, the bound polymers might have an extended circulating time by "hitchhiking" on RBCs in the bloodstream. These results provide significant information and insight for related studies of the interaction of amphiphilic molecules with cell membranes and for in vivo applications of biopolymers as drug delivery systems.
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Affiliation(s)
- Zonghua Liu
- Centre for Blood Research, Department of Pathology and Laboratory of Medicine, University of British Columbia, Vancouver, BC, Canada
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Surface modification of islets with PEG-lipid for improvement of graft survival in intraportal transplantation. Transplantation 2009; 88:624-30. [PMID: 19741458 DOI: 10.1097/tp.0b013e3181b230ac] [Citation(s) in RCA: 87] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
BACKGROUND Transplantation of islets of Langerhans (islets) is a promising technique for treating insulin-dependent diabetes mellitus (type I). One unsolved issue is the early graft loss due to inflammatory reactions triggered by blood coagulation and complement activation that occurs immediately after transplantation into the liver through the portal vein. Several proposed approaches for improvement of the graft survival include heparin coating and covalent poly(ethylene glycol) (PEG) conjugation. We previously have studied the improvement of graft survival by modification of islet surfaces using amphiphilic PEG-conjugated phospholipid and bioactive molecules. Here, we analyzed the effect of PEG-modification on the improvement of graft survival immediately after intraportal transplantation into streptozotocin-induced diabetic mice. METHODS The surface of hamster islets was modified with PEG-lipid. PEG-lipid modified islets (PEG-islets) were transplanted into the liver through the portal vein of streptozotocin-induced diabetic mice. We measured the graft survival periods and blood insulin levels immediately after intraportal transplantation to determine the cell damage to islets. Histocytochemical analyses of liver were also performed postintraportal transplantation. RESULTS The graft survival of PEG-islets was significantly prolonged compared with bare islets in livers of diabetic mice. Reduction of blood insulin level within 60 min after transplantation of PEG-islets suggests that the cell damage observed immediately after transplantation could be suppressed by surface modification with PEG in comparison with bare islets. CONCLUSION Our approach for the improvement of graft survival will be useful in the clinical setting.
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Lipid-based systemic delivery of siRNA. Adv Drug Deliv Rev 2009; 61:721-31. [PMID: 19328215 DOI: 10.1016/j.addr.2009.03.003] [Citation(s) in RCA: 352] [Impact Index Per Article: 23.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2009] [Accepted: 03/10/2009] [Indexed: 01/13/2023]
Abstract
RNAi technology has brought a new category of treatments for various diseases including genetic diseases, viral diseases, and cancer. Despite the great versatility of RNAi that can down regulate almost any protein in the cells, the delicate and precise machinery used for silencing is the same. The major challenge indeed for RNAi-based therapy is the delivery system. In this review, we start with the uniqueness and mechanism of RNAi machinery and the utility of RNAi in therapeutics. Then we discuss the challenges in systemic siRNA delivery by dividing them into two categories-kinetic and physical barriers. At the end, we discuss different strategies to overcome these barriers, especially focusing on the step of endosome escape. Toxicity issues and current successful examples for lipid-based delivery are also included in the review.
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Abe H, Fujihara M, Azuma H, Ikeda H, Ikebuchi K, Takeoka S, Tsuchida E, Harashima H. Interaction of Hemoglobin Vesicles, a Cellular-Type Artificial Oxygen Carrier, with Human Plasma: Effects on Coagulation, Kallikrein-Kinin, and Complement Systems. ACTA ACUST UNITED AC 2009; 34:1-10. [PMID: 16519400 DOI: 10.1080/00207450500428204] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Abstract
Hemoglobin vesicles (HbVs), cellular-type artificial oxygen carriers containing human hemoglobin, were assessed for their biocompatibility by mixing with human plasma in vitro. Among three kinds of HbVs (PEG-DPEA-HbV, PEG-DPPG-HbV and DPPG-HbV), PEG-DPEA-HbV did not affect the extrinsic or intrinsic coagulation activities of the plasma, while PEG-DPPG-HbV and DPPG-HbV tended to shorten the intrinsic coagulation time. The kallikrein-kinin cascade of the plasma was slightly activated by PEG-DPPG-HbV and DPPG-HbV, but not by PEG-DPEA-HbV. The complement consumption of the plasma was observed by incubation with DPPG-HbV, but not with PEG-DPEA-HbV or PEG-DPPG-HbV. These results indicate that PEG-DPEA-HbV has a higher biocompatibility with human plasma.
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Affiliation(s)
- Hideki Abe
- Hokkaido Red Cross Blood Center, Japanese Red Cross, Yamanote 2-2, Nishi-ku, Sapporo 063-0002, Japan.
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