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Assoni L, Couto AJM, Vieira B, Milani B, Lima AS, Converso TR, Darrieux M. Animal models of Klebsiella pneumoniae mucosal infections. Front Microbiol 2024; 15:1367422. [PMID: 38559342 PMCID: PMC10978692 DOI: 10.3389/fmicb.2024.1367422] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2024] [Accepted: 03/04/2024] [Indexed: 04/04/2024] Open
Abstract
Klebsiella pneumoniae is among the most relevant pathogens worldwide, causing high morbidity and mortality, which is worsened by the increasing rates of antibiotic resistance. It is a constituent of the host microbiota of different mucosa, that can invade and cause infections in many different sites. The development of new treatments and prophylaxis against this pathogen rely on animal models to identify potential targets and evaluate the efficacy and possible side effects of therapeutic agents or vaccines. However, the validity of data generated is highly dependable on choosing models that can adequately reproduce the hallmarks of human diseases. The present review summarizes the current knowledge on animal models used to investigate K. pneumoniae infections, with a focus on mucosal sites. The advantages and limitations of each model are discussed and compared; the applications, extrapolations to human subjects and future modifications that can improve the current techniques are also presented. While mice are the most widely used species in K. pneumoniae animal studies, they present limitations such as the natural resistance to the pathogen and difficulties in reproducing the main steps of human mucosal infections. Other models, such as Drosophila melanogaster (fruit fly), Caenorhabditis elegans, Galleria mellonella and Danio rerio (zebrafish), contribute to understanding specific aspects of the infection process, such as bacterial lethality and colonization and innate immune system response, however, they but do not present the immunological complexity of mammals. In conclusion, the choice of the animal model of K. pneumoniae infection will depend mainly on the questions being addressed by the study, while a better understanding of the interplay between bacterial virulence factors and animal host responses will provide a deeper comprehension of the disease process and aid in the development of effective preventive/therapeutic strategies.
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Affiliation(s)
| | | | | | | | | | | | - Michelle Darrieux
- Laboratório de Microbiologia Molecular e Clínica, Universidade São Francisco, Bragança Paulista, Brazil
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2
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Sun J, Yin Z, Wang X, Su J. Exosome-Laden Hydrogels: A Novel Cell-free Strategy for In-situ Bone Tissue Regeneration. Front Bioeng Biotechnol 2022; 10:866208. [PMID: 35433664 PMCID: PMC9011111 DOI: 10.3389/fbioe.2022.866208] [Citation(s) in RCA: 12] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2022] [Accepted: 03/07/2022] [Indexed: 12/15/2022] Open
Abstract
In-situ bone tissue regeneration, which harnesses cell external microenvironment and their regenerative potential to induce cell functions and bone reconstruction through some special properties of biomaterials, has been deeply developed. In which, hydrogel was widely applied due to its 3D network structure with high water absorption and mimicking native extracellular matrix (ECM). Additionally, exosomes can participate in a variety of physiological processes such as cell differentiation, angiogenesis and tissue repair. Therefore, a novel cell-free tissue engineering (TE) using exosome-laden hydrogels has been explored and developed for bone regeneration in recent years. However, related reviews in this field are limited. Therefore, we elaborated on the shortcomings of traditional bone tissue engineering, the challenges of exosome delivery and emphasized the advantages of exosome-laden hydrogels for in-situ bone tissue regeneration. The encapsulation strategies of hydrogel and exosomes are listed, and the research progress and prospects of bioactive hydrogel composite system for continuous delivery of exosomes for in-situ bone repair are also discussed in this review.
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Affiliation(s)
- Jinru Sun
- Institute of Translational Medicine, Shanghai University, Shanghai, China
| | - Zhifeng Yin
- Department of Orthopedics, Shanghai Zhongye Hospital, Shanghai, China
| | - Xiuhui Wang
- Institute of Translational Medicine, Shanghai University, Shanghai, China
- *Correspondence: Xiuhui Wang, ; Jiacan Su,
| | - Jiacan Su
- Institute of Translational Medicine, Shanghai University, Shanghai, China
- Department of Orthopaedics Trauma, Changhai Hospital, Second Military Medical University, Shanghai, China
- *Correspondence: Xiuhui Wang, ; Jiacan Su,
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3
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Su X, Zhang X, Liu W, Yang X, An N, Yang F, Sun J, Xing Y, Shang H. Advances in the application of nanotechnology in reducing cardiotoxicity induced by cancer chemotherapy. Semin Cancer Biol 2021; 86:929-942. [PMID: 34375726 DOI: 10.1016/j.semcancer.2021.08.003] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2021] [Revised: 08/03/2021] [Accepted: 08/05/2021] [Indexed: 02/08/2023]
Abstract
Advances in the development of anti-tumour drugs and related technologies have resulted in a significant increase in the number of cancer survivors. However, the incidence of chemotherapy-induced cardiotoxicity (CIC) has been rising continuously, threatening their long-term survival. The integration of nanotechnology and biomedicine has brought about an unprecedented technological revolution and has promoted the progress of anti-tumour therapy. In this review, we summarised the possible mechanisms of CIC, evaluated the role of nanoparticles (including liposomes, polymeric micelles, dendrimers, and hydrogels) as drug carriers in preventing cardiotoxicity and proposed five advantages of nanotechnology in reducing cardiotoxicity: Liposomes cannot easily penetrate the heart's endothelial barrier; optimized delivery strategies reduce distribution in important organs, such as the heart; targeting the tumour microenvironment and niche; stimulus-responsive polymer nano-drug carriers rapidly iterate; better economic benefits were obtained. Nanoparticles can effectively deliver chemotherapeutic drugs to tumour tissues, while reducing the toxicity to heart tissues, and break through the dilemma of existing chemotherapy to a certain extent. It is important to explore the interactions between the physicochemical properties of nanoparticles and optimize the highly specific tumour targeting strategy in the future.
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Affiliation(s)
- Xin Su
- Guang'anmen Hospital, China Academy of Chinese Medical Sciences, Beijing, China
| | - Xiaoyu Zhang
- Key Laboratory of Chinese Internal Medicine of Ministry of Education, Dongzhimen Hospital, Beijing University of Chinese Medicine, Beijing, China
| | - Wenjing Liu
- Key Laboratory of Chinese Internal Medicine of Ministry of Education, Dongzhimen Hospital, Beijing University of Chinese Medicine, Beijing, China
| | - Xinyu Yang
- Key Laboratory of Chinese Internal Medicine of Ministry of Education, Dongzhimen Hospital, Beijing University of Chinese Medicine, Beijing, China
| | - Na An
- Key Laboratory of Chinese Internal Medicine of Ministry of Education, Dongzhimen Hospital, Beijing University of Chinese Medicine, Beijing, China
| | - Fan Yang
- Guang'anmen Hospital, China Academy of Chinese Medical Sciences, Beijing, China
| | - Jiahao Sun
- Guang'anmen Hospital, China Academy of Chinese Medical Sciences, Beijing, China
| | - Yanwei Xing
- Guang'anmen Hospital, China Academy of Chinese Medical Sciences, Beijing, China.
| | - Hongcai Shang
- Key Laboratory of Chinese Internal Medicine of Ministry of Education, Dongzhimen Hospital, Beijing University of Chinese Medicine, Beijing, China; College of Integrated Traditional Chinese and Western Medicine, Hunan University of Chinese Medicine, Changsha, Hunan, China.
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4
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Huang J, Xiong J, Yang L, Zhang J, Sun S, Liang Y. Cell-free exosome-laden scaffolds for tissue repair. NANOSCALE 2021; 13:8740-8750. [PMID: 33969373 DOI: 10.1039/d1nr01314a] [Citation(s) in RCA: 68] [Impact Index Per Article: 22.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
With the development of regenerative medicine, tissue repair at the molecular, cellular, tissue, and organ level has seen continuous improvements over traditional techniques. As the core of tissue repair, seed cells are widely used in various fields of regenerative medicine. However, their use is still associated with problems such as decreased cell survival and regeneration capacity after transplantation, immune rejection, and ethical concerns. Therefore, it is difficult to universally and safely apply stem cell banks for regenerative medicine. The paracrine effects of cells, especially secretion of exosomes, play vital roles in cell communication, immune response, angiogenesis, scar formation, tissue repair, and other biological functions. Exosomes are a type of nanoscale extracellular vesicle that contain biologically active molecules such as RNA and proteins; therefore, exosomes can replicate the functions of their parental cells. Meanwhile, exosomes can be used as nanocarriers to deliver active factors or small molecules to promote tissue repair. Preclinical studies of exosomes in tissue engineering and regenerative medicine have been carried in the fields of bone/cartilage repair, nerve regeneration, liver and kidney regeneration, skin repair, vascular tissue regeneration, etc. This review introduces exosomes from the aspects of biogenesis, composition, identification, and isolation, and focuses on the development status of scaffold materials for exosome delivery. In addition, we highlight examples of exosome-laden scaffolds for preclinical applications in tissue repair. We look forward to the broad application prospects of exosome-laden scaffolds.
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Affiliation(s)
- Jianghong Huang
- Department of Orthopedics, Shenzhen Second People's Hospital (First Affiliated Hospital of Shenzhen University, Health Science Center), Shenzhen 518035, China and Tsinghua University Shenzhen International Graduate School, Innovation Leading Engineering Doctor, Class 9 of 2020, Shenzhen, 518055, China
| | - Jianyi Xiong
- Department of Orthopedics, Shenzhen Second People's Hospital (First Affiliated Hospital of Shenzhen University, Health Science Center), Shenzhen 518035, China
| | - Lei Yang
- Department of Orthopedics, Shenzhen Second People's Hospital (First Affiliated Hospital of Shenzhen University, Health Science Center), Shenzhen 518035, China
| | - Jun Zhang
- Tsinghua University Shenzhen International Graduate School, Innovation Leading Engineering Doctor, Class 9 of 2020, Shenzhen, 518055, China
| | - Shuqing Sun
- Tsinghua University Shenzhen International Graduate School, Institute of Biomedicine and Health Engineering, Shenzhen, 518055, China
| | - Yujie Liang
- Department of Child and Adolescent Psychiatry, Shenzhen Kangning Hospital, Shenzhen Mental Health Center, Shenzhen Key Laboratory for Psychological Healthcare & Shenzhen Institute of Mental Health, Shenzhen, 518020, China.
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5
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de Jong OG, Kooijmans SAA, Murphy DE, Jiang L, Evers MJW, Sluijter JPG, Vader P, Schiffelers RM. Drug Delivery with Extracellular Vesicles: From Imagination to Innovation. Acc Chem Res 2019; 52:1761-1770. [PMID: 31181910 PMCID: PMC6639984 DOI: 10.1021/acs.accounts.9b00109] [Citation(s) in RCA: 170] [Impact Index Per Article: 34.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Extracellular vesicles are nanoparticles produced by cells. They are composed of cellular membrane with associated membrane proteins that surrounds an aqueous core containing soluble molecules such as proteins and nucleic acids, like miRNA and mRNA. They are important in many physiological and pathological processes as they can transfer biological molecules from producer cells to acceptor cells. Preparation of the niche for cancer metastasis, stimulation of tissue regeneration and orchestration of the immune response are examples of the diverse processes in which extracellular vesicles have been implicated. As a result, these vesicles have formed a source of inspiration for many scientific fields. They could be used, for example, as liquid biopsies in diagnostics, as therapeutics in regenerative medicine, or as drug delivery vehicles for transport of medicines. In this Account, we focus on drug delivery applications. As we learn more and more about these vesicles, the complexity increases. What originally appeared to be a relatively uniform population of cellular vesicles is increasingly subdivided into different subsets. Cells make various distinct vesicle types whose physicochemical aspects and composition is influenced by parental cell type, cellular activation state, local microenvironment, biogenesis pathway, and intracellular cargo sorting routes. It has proven difficult to assess the effects of changes in production protocol on the characteristics of the cell-derived vesicle population. On top of that, each isolation method for vesicles necessarily enriches certain vesicle classes and subpopulations while depleting others. Also, each method is associated with a varying degree of vesicle purity and concomitant coisolation of nonvesicular material. What emerges is a staggering heterogeneity. This constitutes one of the main challenges of the field as small changes in production and isolation protocols may have large impact on the vesicle characteristics and on subsequent vesicle activity. We try to meet this challenge by careful experimental design and development of tools that enable robust readouts. By engineering the surface and cargo of extracellular vesicles through chemical and biological techniques, favorable characteristics can be enforced while unfavorable qualities can be overruled or masked. This is coupled to the precise evaluation of the interaction of extracellular vesicles with cells to determine the extracellular vesicle uptake routes and intracellular routing. Sensitive reporter assays enable reproducible analysis of functional delivery. This systematic evaluation and optimization of extracellular vesicles improves our insight into the critical determinants of extracellular vesicle activity and should improve translation into clinical application of engineered extracellular vesicles as a new class of drug delivery systems.
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Affiliation(s)
- Olivier G. de Jong
- Laboratory Clinical Chemistry & Hematology, University Medical Center Utrecht, Utrecht University, Heidelberglaan 100, 3584 CX Utrecht, The Netherlands
| | - Sander A. A. Kooijmans
- Laboratory Clinical Chemistry & Hematology, University Medical Center Utrecht, Utrecht University, Heidelberglaan 100, 3584 CX Utrecht, The Netherlands
| | - Daniel E. Murphy
- Laboratory Clinical Chemistry & Hematology, University Medical Center Utrecht, Utrecht University, Heidelberglaan 100, 3584 CX Utrecht, The Netherlands
| | - Linglei Jiang
- Laboratory Clinical Chemistry & Hematology, University Medical Center Utrecht, Utrecht University, Heidelberglaan 100, 3584 CX Utrecht, The Netherlands
| | - Martijn J. W. Evers
- Laboratory Clinical Chemistry & Hematology, University Medical Center Utrecht, Utrecht University, Heidelberglaan 100, 3584 CX Utrecht, The Netherlands
| | - Joost P. G. Sluijter
- Experimental Cardiology, University Medical Center Utrecht, Utrecht University, Heidelberglaan 100, 3584 CX Utrecht, The Netherlands
- University Medical Center Utrecht Regenerative Medicine Center, University Medical Center Utrecht, Utrecht University, Heidelberglaan 100, 3584 CX Utrecht, The Netherlands
| | - Pieter Vader
- Laboratory Clinical Chemistry & Hematology, University Medical Center Utrecht, Utrecht University, Heidelberglaan 100, 3584 CX Utrecht, The Netherlands
- Experimental Cardiology, University Medical Center Utrecht, Utrecht University, Heidelberglaan 100, 3584 CX Utrecht, The Netherlands
| | - Raymond M. Schiffelers
- Laboratory Clinical Chemistry & Hematology, University Medical Center Utrecht, Utrecht University, Heidelberglaan 100, 3584 CX Utrecht, The Netherlands
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6
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Ritsema JAS, Herschberg EMA, Borgos SE, Løvmo C, Schmid R, Te Welscher YM, Storm G, van Nostrum CF. Relationship between polarities of antibiotic and polymer matrix on nanoparticle formulations based on aliphatic polyesters. Int J Pharm 2017; 548:730-739. [PMID: 29133206 DOI: 10.1016/j.ijpharm.2017.11.017] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2017] [Revised: 11/07/2017] [Accepted: 11/08/2017] [Indexed: 12/21/2022]
Abstract
In the field of nanomedicine, nanoparticles are developed to target antibiotics to sites of bacterial infection thus enabling adequate drug exposure and decrease development of resistant bacteria. In the present study, we investigated the encapsulation of two antibiotics with different polarity into different PEGylated polymeric nanoparticles based on aliphatic polyesters, to obtain a better understanding of critical factors determining encapsulation and release. The nanoparticles were prepared from diblock copolymers comprising of a poly(ethylene glycol) block attached to an aliphatic polyester block of varying polarity: poly(lactic-co-glycolic acid) (mPEG-PLGA), poly(lactic-co-hydroxymethyl glycolic acid) (mPEG-PLHMGA) and poly(lactic-co-benzyloxymethyl glycolic acid) (mPEG-PLBMGA). Hydrophobic bedaquiline and hydrophilic vancomycin were encapsulated via single and double-emulsion solvent evaporation techniques, respectively. Encapsulation, degradation and release studies at physiological simulating conditions were performed. Drug polarity and preparation techniques influenced encapsulation efficiency into polymer nanoparticles, giving almost complete encapsulation of bedaquiline and approx. 30% for vancomycin independent of the polymer type. The nonpolar bedaquiline showed a predominantly diffusion-controlled release independent of polymer composition. However, polar vancomycin was released by a combination of diffusion and polymer degradation, which was significantly affected by polymer composition, the most hydrophilic polymer displaying the fastest release.
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Affiliation(s)
- J A S Ritsema
- Department of Pharmaceutics, Utrecht Institute for Pharmaceutical Sciences, Utrecht University, Utrecht, The Netherlands.
| | - E M A Herschberg
- Department of Pharmaceutics, Utrecht Institute for Pharmaceutical Sciences, Utrecht University, Utrecht, The Netherlands
| | - S E Borgos
- Department of Biotechnology and Nanomedicine, SINTEF Materials and Chemistry, Trondheim, Norway
| | - C Løvmo
- Department of Biotechnology and Nanomedicine, SINTEF Materials and Chemistry, Trondheim, Norway
| | - R Schmid
- Department of Biotechnology and Nanomedicine, SINTEF Materials and Chemistry, Trondheim, Norway
| | - Y M Te Welscher
- Department of Pharmaceutics, Utrecht Institute for Pharmaceutical Sciences, Utrecht University, Utrecht, The Netherlands
| | - G Storm
- Department of Pharmaceutics, Utrecht Institute for Pharmaceutical Sciences, Utrecht University, Utrecht, The Netherlands
| | - C F van Nostrum
- Department of Pharmaceutics, Utrecht Institute for Pharmaceutical Sciences, Utrecht University, Utrecht, The Netherlands.
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7
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Song J, Palanikumar L, Choi Y, Kim I, Heo TY, Ahn E, Choi SH, Lee E, Shibasaki Y, Ryu JH, Kim BS. The power of the ring: a pH-responsive hydrophobic epoxide monomer for superior micelle stability. Polym Chem 2017. [DOI: 10.1039/c7py01613a] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
We developed micelles with superior stability by integrating a novel hydrophobic, pH-responsive epoxide monomer, tetrahydropyranyl glycidyl ether.
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8
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Kooijmans S, Fliervoet L, van der Meel R, Fens M, Heijnen H, van Bergen en Henegouwen P, Vader P, Schiffelers R. PEGylated and targeted extracellular vesicles display enhanced cell specificity and circulation time. J Control Release 2016; 224:77-85. [DOI: 10.1016/j.jconrel.2016.01.009] [Citation(s) in RCA: 245] [Impact Index Per Article: 30.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2015] [Revised: 01/04/2016] [Accepted: 01/05/2016] [Indexed: 12/30/2022]
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9
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van der Meel R, Fens MHAM, Vader P, van Solinge WW, Eniola-Adefeso O, Schiffelers RM. Extracellular vesicles as drug delivery systems: lessons from the liposome field. J Control Release 2014; 195:72-85. [PMID: 25094032 DOI: 10.1016/j.jconrel.2014.07.049] [Citation(s) in RCA: 298] [Impact Index Per Article: 29.8] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2014] [Revised: 07/25/2014] [Accepted: 07/26/2014] [Indexed: 12/18/2022]
Abstract
Extracellular vesicles (EVs) are membrane-derived particles surrounded by a (phospho)lipid bilayer that are released by cells in the human body. In addition to direct cell-to-cell contact and the secretion of soluble factors, EVs function as another mechanism of intercellular communication. These vesicles are able to efficiently deliver their parental cell-derived molecular cargo to recipient cells, which can result in structural changes at an RNA, protein, or even phenotypic level. For this reason, EVs have recently gained much interest for drug delivery purposes. In contrast to these 'natural delivery systems', synthetic (phospho)lipid vesicles, or liposomes, have been employed as drug carriers for decades, resulting in several approved liposomal nanomedicines used in the clinic. This review discusses the similarities and differences between EVs and liposomes with the focus on features that are relevant for drug delivery purposes such as circulation time, biodistribution, cellular interactions and cargo loading. By applying beneficial features of EVs to liposomes and vice versa, improved drug carriers can be developed which will advance the field of nanomedicines and ultimately improve patient outcomes. While the application of EVs for therapeutic drug delivery is still in its infancy, issues regarding the understanding of EV biogenesis, large-scale production and in vivo interactions need to be addressed in order to develop successful and cost-effective EV-based drug delivery systems.
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Affiliation(s)
- Roy van der Meel
- Department of Clinical Chemistry and Haematology, University Medical Center Utrecht, Utrecht, The Netherlands
| | - Marcel H A M Fens
- Department of Clinical Chemistry and Haematology, University Medical Center Utrecht, Utrecht, The Netherlands
| | - Pieter Vader
- Department of Clinical Chemistry and Haematology, University Medical Center Utrecht, Utrecht, The Netherlands; Department of Physiology, Anatomy and Genetics, University of Oxford, Oxford, UK
| | - Wouter W van Solinge
- Department of Clinical Chemistry and Haematology, University Medical Center Utrecht, Utrecht, The Netherlands
| | | | - Raymond M Schiffelers
- Department of Clinical Chemistry and Haematology, University Medical Center Utrecht, Utrecht, The Netherlands.
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10
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Lin PJC, Tam Y, Cullis P. Development and clinical applications of siRNA-encapsulated lipid nanoparticles in cancer. ACTA ACUST UNITED AC 2014. [DOI: 10.2217/clp.14.27] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
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11
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Glavas L, Olsén P, Odelius K, Albertsson AC. Achieving micelle control through core crystallinity. Biomacromolecules 2013; 14:4150-6. [PMID: 24066701 PMCID: PMC3876746 DOI: 10.1021/bm401312j] [Citation(s) in RCA: 97] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
![]()
We
have designed a pathway for controlling the critical micelle
concentration and micelle size of polyester-based systems. This was
achieved by creating an array of different copolymers with semicrystalline
or amorphous hydrophobic blocks. The hydrophobic block was constructed
through ring-opening polymerization of ε-caprolactone, l-lactide, and ε-decalactone, either as homopolymers or random
copolymers, using PEG as both the initiator and the hydrophilic block.
Micelles formed with amorphous cores exhibited considerably higher
critical micelle concentrations than those with semicrystalline cores.
Micelles with amorphous cores also became larger in size with an increased
molecular weight of the hydrophobic bock, in contrast to micelles
with semicrystalline cores, which displayed the opposite behavior.
Hence, core crystallinity was found to be a potent tool for tailoring
micelle properties and thereby facilitating the optimization of drug
delivery systems. The introduction of PEG-PεDL also proved to
be a valuable asset in the tuning of micelle properties.
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Affiliation(s)
- Lidija Glavas
- Fiber and Polymer Technology, School of Chemical Science and Engineering, KTH, Royal Institute of Technology , SE-100 44 Stockholm, Sweden
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12
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Alhariri M, Azghani A, Omri A. Liposomal antibiotics for the treatment of infectious diseases. Expert Opin Drug Deliv 2013; 10:1515-32. [PMID: 23886421 DOI: 10.1517/17425247.2013.822860] [Citation(s) in RCA: 52] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
INTRODUCTION Liposomal delivery systems have been utilized in developing effective therapeutics against cancer and targeting microorganisms in and out of host cells and within biofilm community. The most attractive feature of liposome-based drugs are enhancing therapeutic index of the new or existing drugs while minimizing their adverse effects. AREAS COVERED This communication provides an overview on several aspects of liposomal antibiotics including the most widely used preparation techniques for encapsulating different agents and the most important characteristic parameters applied for examining shape, size and stability of the spherical vesicles. In addition, the routes of administration, liposome-cell interactions and host parameters affecting the biodistribution of liposomes are highlighted. EXPERT OPINION Liposomes are safe and suitable for delivery of variety of molecules and drugs in biomedical research and medicine. They are known to improve the therapeutic index of encapsulated agents and reduce drug toxicity. Recent studies on liposomal formulation of chemotherapeutic and bioactive agents and their targeted delivery show liposomal antibiotics potential in the treatment of microbial infections.
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Affiliation(s)
- Moayad Alhariri
- Laurentian University, The Novel Drug & Vaccine Delivery Systems Facility, Department of Chemistry and Biochemistry , Sudbury, ON, P3E 2C6 , Canada +1 705 675 1151 ext. 2190 ; +1 705675 4844 ;
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13
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Improvement of the pharmacokinetics and in vivo antibacterial efficacy of a novel type IIa topoisomerase inhibitor by formulation in liposomes. Antimicrob Agents Chemother 2013; 57:4816-24. [PMID: 23877679 DOI: 10.1128/aac.00163-13] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Several useful properties of liposome-based formulations of various existing antibacterial drugs have been reported. These properties include lower MICs, improved pharmacokinetics, lower toxicity, selective distribution to infected tissues, and enhanced in vivo efficacy. Here we report in vivo studies of a liposomal formulation of a member of a novel class of antibacterial type II topoisomerase inhibitors, others of which have progressed to early phases of clinical trials. The free (i.e., nonliposomal) compound has broad-spectrum MICs but suboptimal pharmacokinetics in rats and mice, characterized by a high volume of distribution and rapid clearance. The liposomal formulation of the compound had essentially unchanged MICs but greatly reduced volume of distribution and clearance in rats and mice. In an in vivo mouse model of Staphylococcus aureus infection of one thigh, the liposomal compound localized preferentially to the infected thigh, whereas the free compound showed no preference for the infected versus the uninfected thigh. Most importantly, the liposomal compound had enhanced efficacy at clearing the infection compared with the free compound. Delivery of this class of compounds as liposomal formulations may offer clinical advantages compared with free compounds.
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14
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Abstract
BACKGROUND Nanoparticles are increasingly being incorporated into the design of diagnostic imaging agents. Significant research efforts have been conducted with one class of lipid nanoparticle (liposomes) radiolabeled with gamma-emitting radionuclides as radiopharmaceuticals for scintigraphic imaging of cancer, inflammation/infection and sentinel lymph node detection. OBJECTIVE This article reviews the current literature with special emphasis on the clinical studies performed with liposome radiopharmaceuticals for detection of tumors, infectious/inflammatory sites or metastatic lymph nodes. Future uses of liposome radiopharmaceuticals are also described. METHODS Characteristics required of the radionuclide, liposome formulation and radiolabeling method for an effective radiopharmaceutical are discussed. A description of the procedures and instrumentation for conducting an imaging study with liposome radiopharmaceutical is included. Clinical studies using liposome radiopharmaceuticals are summarized. Future imaging applications of first- and second-generation radiolabeled liposomes for chemodosimetry and the specific targeting of a disease process are also described. RESULTS/CONCLUSION The choice of radionuclide, liposome formulation and radiolabeling method must be carefully considered during the design of a liposome radiopharmaceutical for a given application. After-loading and surface chelation methods are the most efficient and practical. Clinical studies with liposome radiopharmaceuticals demonstrated that a wide variety of tumors could be detected with good sensitivity and specificity. Liposome radiopharmaceuticals could also clearly detect various soft tissue and bone inflammatory/infectious lesions, and performed equal to or better than infection imaging agents that are approved at present. Yet, despite these favorable results, no liposome radiopharmaceutical has been approved for any indication. Some of the reasons for this can be attributed to reports of an unexpected infusion-related adverse reaction in two studies, the requirement of more complex liposome manufacturing procedures, and the adoption of other competing imaging procedures. Continued research of liposome radiopharmaceutical design based on a better understanding of liposome biology, improved radiolabeling methodologies and advances in gamma camera technology is warranted.
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Affiliation(s)
- Beth A Goins
- The University of Texas Health Science Center at San Antonio, TX Department of Radiology, Mail Code 7800, 7703 Floyd Curl Drive, San Antonio, TX 78229-3900, USA +1 210 567 5575 ; +1 210 567 5549 ;
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15
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Su Z, Shi Y, Xiao Y, Sun M, Ping Q, Zong L, Li S, Niu J, Huang A, You W, Chen Y, Chen X, Fei J, Tian J. Effect of octreotide surface density on receptor-mediated endocytosis in vitro and anticancer efficacy of modified nanocarrier in vivo after optimization. Int J Pharm 2013; 447:281-92. [DOI: 10.1016/j.ijpharm.2013.01.068] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2012] [Revised: 01/14/2013] [Accepted: 01/30/2013] [Indexed: 02/07/2023]
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16
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Drug targeting to inflammation: Studies on antioxidant surface loaded diclofenac liposomes. Int J Pharm 2011; 414:179-85. [DOI: 10.1016/j.ijpharm.2011.05.031] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2011] [Revised: 05/06/2011] [Accepted: 05/08/2011] [Indexed: 11/19/2022]
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17
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Kurmi BD, Kayat J, Gajbhiye V, Tekade RK, Jain NK. Micro- and nanocarrier-mediated lung targeting. Expert Opin Drug Deliv 2010; 7:781-94. [PMID: 20560777 DOI: 10.1517/17425247.2010.492212] [Citation(s) in RCA: 91] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
IMPORTANCE OF THE FIELD Drug delivery to lungs appears to be an attractive proposition on account of the large surface area of the alveolar region; it provides tremendous opportunities to improve drug therapies both systemically and locally using new drug delivery systems. Administration of drugs directly to the lungs is the most appropriate route in the treatment of asthma and other pulmonary diseases such as tuberculosis, chronic obstructive pulmonary disease and lung cancer. AREAS COVERED IN THIS REVIEW This review focuses on the utilization of nano- and microcarriers such as microspheres, nanoparticles, liposomes, niosomes and dendrimers for targeted delivery of bioactive molecules to lungs. WHAT THE READER WILL GAIN This review sheds light on the current status of nano- and microcarrier-mediated lung targeting of bioactive compounds. TAKE HOME MESSAGE The literature review shows that carriers could supplement sustained drug delivery to the lungs, extended duration of action, reduced therapeutic dose, improved patient compliance, and reduced adverse effects of highly toxic drugs. There is still a need to identify more specific receptors that are present exclusively in the lungs. The identification of such receptors may also facilitate drug targeting to further specific parts of the lungs, such as bronchioles and alveoli.
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Affiliation(s)
- Balak D Kurmi
- Dr Hari Singh Gour University, Department of Pharmaceutical Sciences, Pharmaceutics Research Laboratory, Sagar 470 003, India
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Schroeder A, Turjeman K, Schroeder JE, Leibergall M, Barenholz Y. Using liposomes to target infection and inflammation induced by foreign body injuries or medical implants. Expert Opin Drug Deliv 2010; 7:1175-89. [DOI: 10.1517/17425247.2010.517519] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
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Masking and triggered unmasking of targeting ligands on nanocarriers to improve drug delivery to brain tumors. Biomaterials 2009; 30:3986-95. [DOI: 10.1016/j.biomaterials.2009.04.012] [Citation(s) in RCA: 105] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2009] [Accepted: 04/13/2009] [Indexed: 11/20/2022]
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Rijcken CJ, Snel CJ, Schiffelers RM, van Nostrum CF, Hennink WE. Hydrolysable core-crosslinked thermosensitive polymeric micelles: synthesis, characterisation and in vivo studies. Biomaterials 2007; 28:5581-93. [PMID: 17915312 DOI: 10.1016/j.biomaterials.2007.08.047] [Citation(s) in RCA: 200] [Impact Index Per Article: 11.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2007] [Accepted: 08/27/2007] [Indexed: 11/23/2022]
Abstract
In this study, core-crosslinked (CCL) biodegradable thermosensitive micelles based on mPEG(5000) and N-(2-hydroxyethyl)methacrylamide)-oligolactates (mPEG-b-p(HEMAm-Lac(n))) were synthesised and their properties investigated. Rapidly heating aqueous solutions of partially methacrylated block copolymers to above their critical micelle temperature (CMT), followed by illumination in presence of a photoinitiator yielded almost monodisperse CCL micelles with a size of 68+/-7 nm. Either below the CMT or after addition of sodium dodecyl sulphate, the non-crosslinked (NCL) micelles rapidly disintegrated whereas the CCL micelles kept their integrity. NCL micelles fell apart after 5h in pH 7.4 at 37 degrees C as a result of the hydrolysis of lactate side chains, whereas the CCL micelles had a much higher stability and only degraded after cleavage of the ester bonds in the crosslinks. The circulation kinetics and biodistribution of CCL micelles were considerably better than those of NCL micelles, i.e., 58% of the injected dose (ID) of CCL versus 6% of NCL micelles was recovered in the circulation 4h post-injection. Furthermore, the liver uptake of the CCL micelles (10% ID) was much lower than that of the NCL micelles (24% ID) 4h after administration, while tumour accumulation was almost 6 times higher for the CCL micelles. Likely, NCL micelles dissociated after i.v. administration and/or were opsonised and captured by macrophages while the dense PEG shell of CCL micelles made them less prone towards opsonisation. The excellent physical stability of these degradable CCL micelles and very favourable biodistribution profile renders them very suitable for drug targeting purposes.
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Affiliation(s)
- Cristianne J Rijcken
- Department of Pharmaceutics, Utrecht Institute for Pharmaceutical Sciences, Utrecht University, Utrecht, The Netherlands
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Koning GA, Schiffelers RM, Wauben MHM, Kok RJ, Mastrobattista E, Molema G, ten Hagen TLM, Storm G. Targeting of angiogenic endothelial cells at sites of inflammation by dexamethasone phosphate-containing RGD peptide liposomes inhibits experimental arthritis. ACTA ACUST UNITED AC 2006; 54:1198-208. [PMID: 16575845 DOI: 10.1002/art.21719] [Citation(s) in RCA: 140] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
OBJECTIVE To investigate whether RGD peptide-exposing long circulating polyethylene glycol (PEG) liposomes (RGD-PEG-L) targeted to alphavbeta3 integrins expressed on angiogenic vascular endothelial cells (VECs) are able to bind VECs at sites of inflammation and whether such liposomes containing dexamethasone phosphate (DEXP) can be used as carriers to interfere with the development of experimental arthritis. METHODS Binding and internalization of RGD-PEG-L were studied by fluorescence-activated cell sorting and confocal microscopy using fluorescently labeled liposomes. Radiolabeled liposomes were used to test in vivo pharmacokinetics and inflammation site targeting in lipopolysaccharide (LPS)-induced inflammation and adjuvant-induced arthritis (AIA) in rats. In vivo inflammation targeting was visualized by intravital microscopy using fluorescently labeled RGD-PEG-L. Therapeutic efficacy of DEXP-encapsulating RGD-PEG-L compared with nontargeted liposomes was evaluated in rats with AIA. RESULTS RGD-PEG-L bound to and were taken up by proliferating human VECs in vitro. In vivo, increased targeting of radiolabeled RGD-PEG-L to areas of LPS-induced inflammation in rats was observed. Specific association with the blood vessel wall at the site of inflammation was confirmed by intravital microscopy. One single intravenous injection of DEXP encapsulated in RGD-PEG-L resulted in a strong and long-lasting antiarthritic effect in rat AIA. CONCLUSION RGD-targeted PEG liposomes represent an endothelial cell-specific drug delivery system that targets VECs at sites of inflammation. Use of these liposomes to deliver DEXP to VECs at arthritis-affected sites proved efficacious in rat adjuvant arthritis. These data indicate that VECs have an essential role in the inflammation process and suggest the possibility of using VEC targeting for therapeutic intervention in inflammatory processes such as arthritis.
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Affiliation(s)
- Gerben A Koning
- Department of Pharmaceutics, Utrecht Institute for Pharmaceutical Sciences, Utrecht University, Utrecht, The Netherlands
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Schiffelers RM, Bakker-Woudenberg IAJM. Innovations in liposomal formulations for antimicrobial therapy. Expert Opin Ther Pat 2005. [DOI: 10.1517/13543776.13.8.1127] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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Ewer MS, Martin FJ, Henderson C, Shapiro CL, Benjamin RS, Gabizon AA. Cardiac safety of liposomal anthracyclines. Semin Oncol 2005; 31:161-81. [PMID: 15717742 DOI: 10.1053/j.seminoncol.2004.08.006] [Citation(s) in RCA: 125] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
Conventional anthracyclines are active against many tumor types, but cardiotoxicity related to the cumulative dose may limit their use; this is particularly problematic for patients with risk factors for increased toxicity, for those who have received any anthracycline in the past, or for those who are to receive other cardiotoxic agents. Preclinical studies determined that encapsulating conventional anthracyclines in liposomes reduced the incidence and severity of cumulative dose-related cardiomyopathy while preserving antitumor activity. In controlled clinical trials, the risk of cardiotoxicity was significantly lower when nonpegylated liposomal doxorubicin (Myocet [NPLD]) was substituted for conventional doxorubicin, but the risk was not significantly different when NPLD was used in place of conventional epirubicin. Direct comparisons to conventional doxorubicin therapy showed comparable efficacy but significantly lower risk of cardiotoxicity with pegylated liposomal doxorubicin (Doxil/Caelyx [PLD]) therapy. Retrospective and prospective trials have not identified a maximum "cardiac safe" dose of PLD, despite use of cumulative doses exceeding 2,000 mg/m2 in some patients. Liposomal daunorubicin (DaunoXome [DNX]) may be associated with a lower risk of cardiotoxicity than conventional anthracyclines, but comparative trials are not available. With respect to combination chemotherapy, early results of clinical trials suggest that combining trastuzumab or a taxane with NPLD or PLD instead of a conventional anthracycline significantly reduces cardiotoxicity risk without reducing chemotherapeutic efficacy. Further results are eagerly awaited from ongoing controlled trials of cardiac safety with long-term liposomal anthracycline therapy, either alone or in combination with other potentially cardiotoxic agents.
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Affiliation(s)
- Michael S Ewer
- University of Texas M. D. Anderson Cancer Center, Houston, TX, USA.
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Bakker-Woudenberg IAJM, Schiffelers RM, Storm G, Becker MJ, Guo L. Long-Circulating Sterically Stabilized Liposomes in the Treatment of Infections. Methods Enzymol 2005; 391:228-60. [PMID: 15721385 DOI: 10.1016/s0076-6879(05)91014-8] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/25/2023]
Abstract
The administration of antimicrobial agents encapsulated in long-circulating sterically stabilized liposomes results in a considerable enhancement of therapeutic efficacy compared with the agents in the free form. After liposomal encapsulation, the pharmacokinetics of the antimicrobial agents is significantly changed. An increase in circulation time and reduction in toxic side effects of the agents are observed. In contrast to other types of long-circulating liposomes, an important characteristic of these sterically stabilized liposomes is that their prolonged blood circulation time is, to a high degree, independent of liposome characteristics such as liposome particle size, charge and lipid composition (rigidity) of the bilayer, and lipid dose. This provides the opportunity to manipulate antibiotic release from these liposomes at the site of infection, which is important in view of the differences in pharmacodynamics of different antibiotics and can be done without compromising blood circulation time and degree of target localization of these liposomes. Depending on the liposome characteristics and the agent encapsulated, antibiotic delivery to the infected site is achieved, or the liposomes act as a micro-reservoir function for the antibiotic. In experimental models of localized or disseminated bacterial and fungal infections, the sterically stabilized liposomes have successfully been used to improve antibiotic treatment using representative agents of various classes of antibacterial agents such as the beta-lactams, the aminoglycosides, and the quinolones or the antifungal agent amphotericin B. Extensive biodistribution studies have been performed. Critical factors that contribute to liposome target localization in infected tissue have been elucidated. Liposome-related factors that were investigated were poly(ethylene glycol) density, particle size, bilayer fluidity, negative surface charge, and circulation kinetics. Host-related factors focused on the components of the inflammatory response.
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Affiliation(s)
- Irma A J M Bakker-Woudenberg
- Department of Medical Microbiology and Infectious Diseases, Erasmus University Rotterdam, Rotterdam, The Netherlands
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Abstract
Liposomes, closed vesicular structures consisting of one or more lipid bilayers, have generated a great deal of interest as drug delivery vehicles. In particular, they have been investigated for their ability to improve the delivery of chemotherapeutic agents to tumors, in efforts to increase therapeutic efficacy and decrease toxicity to normal cells. Development of liposomal chemotherapeutic agents has, in the past, been hindered primarily by the rapid uptake of liposomes by the reticuloendothelial system. Numerous strategies that seek to either exploit or avoid this phenomenon have been used. As a result, several liposomal chemotherapeutic agents are now available in the clinic. STEALTH, a novel liposomal system coated with polyethylene glycol, avoids uptake by the reticuloendothelial system, thus improving drug delivery to the tumor while decreasing toxicity. In pegylated liposomal doxorubicin (Doxil/Caelyx [PLD]), this delivery system encapsulates doxorubicin within polyethylene glycol-coated liposomes, leading to promising new applications for a well-established drug. Liposome-encapsulated doxorubicin citrate complex (Myocet [NPLD]), another liposomal delivery system for doxorubicin, lacks the polyethylene glycol coating, resulting in much shorter circulation times than those of PLD. Daunorubicin citrate liposome (DaunoXome [DNX]) contains daunorubicin encapsulated in a smaller liposome of a different lipid composition. It has circulation times between those of PLD and NPLD. This article reviews the advantages of liposomal delivery systems in general and the divergent approaches that have been taken in developing these agents.
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Affiliation(s)
- Theresa M Allen
- Department of Pharmacology, University of Alberta School of Medicine, Edmonton, Alberta, Canada
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Bakker-Woudenberg IAJM, ten Kate MT, Guo L, Working P, Mouton JW. Ciprofloxacin in polyethylene glycol-coated liposomes: efficacy in rat models of acute or chronic Pseudomonas aeruginosa infection. Antimicrob Agents Chemother 2002; 46:2575-81. [PMID: 12121935 PMCID: PMC127349 DOI: 10.1128/aac.46.8.2575-2581.2002] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2001] [Revised: 12/26/2001] [Accepted: 04/25/2002] [Indexed: 11/20/2022] Open
Abstract
In a previous study in experimental Klebsiella pneumoniae pneumonia, the therapeutic potential of ciprofloxacin was significantly improved by encapsulation in polyethylene glycol-coated ("pegylated") long-circulating (STEALTH) liposomes. Pegylated liposomal ciprofloxacin in high doses was nontoxic and resulted in relatively high and sustained ciprofloxacin concentrations in blood and tissues, and hence an increase in the area under the plasma concentration-time curve (AUC). These data correspond to data from animal and clinical studies showing that for fluoroquinolones the AUC/MIC ratio is associated with favorable outcome in serious infections. Clinical failures and the development of resistance are observed for marginally susceptible organisms like Pseudomonas aeruginosa and for which sufficient AUC/MIC ratios cannot be achieved. In the present study the therapeutic efficacy of pegylated liposomal ciprofloxacin was investigated in two rat models of Pseudomonas aeruginosa pneumonia. In the acute model pneumonia developed progressively, resulting in a rapid onset of septicemia and a high mortality rate. Ciprofloxacin twice daily for 7 days was not effective at doses at or below the maximum tolerated dose (MTD). However, pegylated liposomal ciprofloxacin either at high dosage or given at low dosage in combination with free ciprofloxacin on the first day of treatment was fully effective (100% survival). Obviously, prolonged concentrations of ciprofloxacin in blood prevented death of the animals due to early-stage septicemia in this acute infection. However, bacterial eradication from the left lung was not effected. In the chronic model, pneumonia was characterized by bacterial persistence in the lung without bacteremia, and no signs of morbidity or mortality were observed. Ciprofloxacin administered for 7 days at the MTD twice daily resulted in killing of more than 99% of bacteria in the lung; this result can also be achieved with pegylated liposomal ciprofloxacin given once daily. Complete bacterial eradication is never observed.
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Affiliation(s)
- Irma A J M Bakker-Woudenberg
- Department of Medical Microbiology and Infectious Diseases, Erasmus University Medical Center Rotterdam, PO Box 1738, 3000 DR Rotterdam, The Netherlands.
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Bakker-Woudenberg IAJM. Long-circulating sterically stabilized liposomes as carriers of agents for treatment of infection or for imaging infectious foci. Int J Antimicrob Agents 2002; 19:299-311. [PMID: 11978501 DOI: 10.1016/s0924-8579(02)00021-3] [Citation(s) in RCA: 57] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
Abstract
Liposomes are considered as potential carriers for biologically active compounds. One evident drawback of 'classical' liposomes is their fast elimination by cells of the mononuclear phagocyte system (MPS), primarily by liver and spleen. An important breakthrough in this respect is the development of long-circulating liposomes among which liposomes coated with polyethyleneglycol (PEG), the so-called 'sterically stabilized' liposomes (SSL). An important characteristic of SSL is that their prolonged blood residence time and infectious target localization is relatively independent of the lipid dose, particle size or lipid composition of the bilayer. SSL are applied as carriers of antimicrobial agents to achieve infectious target localization, to reduce side effects, or to serve as a micro-reservoir in the circulation. In addition, radiolabelled SSL are used to image infectious and inflammatory foci.
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Affiliation(s)
- Irma A J M Bakker-Woudenberg
- Department of Medical Microbiology & Infectious Diseases, Erasmus University Medical Center Rotterdam, P.O. Box 1738, 3000 DR, The Netherlands.
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Stearne LET, Schiffelers RM, Smouter E, Bakker-Woudenberg IAJM, Gyssens IC. Biodistribution of long-circulating PEG-liposomes in a murine model of established subcutaneous abscesses. BIOCHIMICA ET BIOPHYSICA ACTA 2002; 1561:91-7. [PMID: 11988183 DOI: 10.1016/s0005-2736(01)00460-6] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
The biodistribution of long-circulating PEG-liposomes in a subcutaneous mouse model of established mixed infection abscesses was investigated to assess their possible role as drug carriers in the treatment of small, undrainable intra-abdominal abscesses. There was a 10-30-fold greater localisation of (67)Ga-labelled PEG-liposomes in abscesses compared to uninfected normal skin samples. Over 3% of the injected dose (ID) of liposomes was present in the abscesses 24 h after liposome administration in contrast to 0.1% in normal skin sections. The percentage ID present in the liver, spleen and kidneys was 17%, 4% and 2% per organ respectively. Five days after liposome injection, 2% ID could still be recovered from the abscesses. Using colloidal gold-labelled PEG-liposomes, it was shown that there was a 4-fold greater density of liposome clusters in the subcutaneous tissue surrounding the capsule than in the core of the abscesses. The clusters within the abscesses were distributed evenly. We conclude that PEG-liposomes localise to a significant degree at the infection focus in our mouse model and may provide a new approach to the antimicrobial treatment of intra-abdominal abscesses.
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Affiliation(s)
- Lorna E T Stearne
- Department of Medical Microbiology and Infectious Diseases, Erasmus MC, University Medical Center Rotterdam, P.O. Box 1738, 3000 DR, Netherlands.
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Schiffelers RM, Storm G, Bakker-Woudenberg IA. Therapeutic efficacy of liposomal gentamicin in clinically relevant rat models. Int J Pharm 2001; 214:103-5. [PMID: 11282246 DOI: 10.1016/s0378-5173(00)00643-8] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Sterically stabilized liposomes are able to localize selectively at sites of infection, potentially permitting targeted drug delivery. Up to now, the majority of studies investigating therapeutic efficacy of liposomes have been conducted in animals with an intact host defense infected with high antibiotic-susceptible bacteria. In the present study, the therapeutic efficacy of gentamicin encapsulated in sterically stabilized liposomes, alone or in combination with the free drug was studied in rats with intact host defense as well as leukopenic rats. Rats were inoculated with a high gentamicin-susceptible or low-gentamicin susceptible Klebsiella pneumoniae in the left lung, resulting in an acute unilateral pneumonia. Survival rates demonstrate the valuable therapeutic properties of the liposome-encapsulated drug in these clinically relevant animal models.
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Affiliation(s)
- R M Schiffelers
- Department of Medical Microbiology and Infectious Diseases, Erasmus University Medical Center Rotterdam, Rotterdam, The Netherlands.
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