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      Is Open Access

      Exosomes as therapeutic drug carriers and delivery vehicles across biological membranes: current perspectives and future challenges

      review-article
      , 1 , *
      Acta Pharmaceutica Sinica. B
      Elsevier
      ALIX, ALG-2 interacting protein X, ATPase, adenosine triphosphatase, BBB, blood–brain barrier, CCK-8, cell counting kit-8, CD, cluster of differentiation, DIL, 1,1′-dioctadecyl-3,3,3′,3′-tetramethylindocarbocyanine perchlorate, DNA, deoxyribonucleic acid, EGF, epidermal growth factor, EGFR, epidermal growth factor receptor, EpCAM, epithelial cell adhesion molecule, ESCRT, endosomal sorting complexes required for transport, EV, extracellular vesicle, HEK293, human embryonic kidney cell line 293, HeLa, Henrietta Lacks cells, HIV, human immunodeficiency virus, HMGA2, high-mobility group AT-hook protein, Hsp, heat shock proteins, IL-6, interleukin-6, ILVs, intraluminal vesicles, kRAS, Kirsten rat sarcoma, LPS, lipopolysaccharides, MAPK-1, mitogen-activated protein kinase 1, MHC, major histocompatibility complex, miRNA, micro RNA, MPS, mononuclear phagocyte system, mRNA, messenger RNA, MVB, multi-vesicular body biogenesis, PBMC, peripheral blood mononuclear cells, PD, Parkinson’s disease, PEG, polyethylene glycol, RNA, ribonucleic acid, ROS, reactive oxygen species, RPE1, retinal pigment epithelial cells 1, siRNA, small interference RNA, TNF-α, tumor necrosis factor α, TSG101, tumor susceptibility gene 101, VPS4, vacuolar protein sorting-associated protein 4, Exosomes, Nanocarrier, Extracellular vesicles, Drug delivery systems

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          Abstract

          Exosomes are small intracellular membrane-based vesicles with different compositions that are involved in several biological and pathological processes. The exploitation of exosomes as drug delivery vehicles offers important advantages compared to other nanoparticulate drug delivery systems such as liposomes and polymeric nanoparticles; exosomes are non-immunogenic in nature due to similar composition as body׳s own cells. In this article, the origin and structure of exosomes as well as their biological functions are outlined. We will then focus on specific applications of exosomes as drug delivery systems in pharmaceutical drug development. An overview of the advantages and challenges faced when using exosomes as a pharmaceutical drug delivery vehicles will also be discussed.

          Graphical abstract

          Exosomes are small vesicles secreted by various cell types and are involved in many biological functions. There is also significant evidence on critical role played by exosomes in many diseases. Here we discuss regarding their potential usage and relevance in therapeutic drug delivery.

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          Most cited references45

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          Biogenesis and secretion of exosomes.

          Although observed for several decades, the release of membrane-enclosed vesicles by cells into their surrounding environment has been the subject of increasing interest in the past few years, which led to the creation, in 2012, of a scientific society dedicated to the subject: the International Society for Extracellular Vesicles. Convincing evidence that vesicles allow exchange of complex information fuelled this rise in interest. But it has also become clear that different types of secreted vesicles co-exist, with different intracellular origins and modes of formation, and thus probably different compositions and functions. Exosomes are one sub-type of secreted vesicles. They form inside eukaryotic cells in multivesicular compartments, and are secreted when these compartments fuse with the plasma membrane. Interestingly, different families of molecules have been shown to allow intracellular formation of exosomes and their subsequent secretion, which suggests that even among exosomes different sub-types exist. Copyright © 2014 Elsevier Ltd. All rights reserved.
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            Using exosomes, naturally-equipped nanocarriers, for drug delivery.

            Exosomes offer distinct advantages that uniquely position them as highly effective drug carriers. Comprised of cellular membranes with multiple adhesive proteins on their surface, exosomes are known to specialize in cell-cell communications and provide an exclusive approach for the delivery of various therapeutic agents to target cells. In addition, exosomes can be amended through their parental cells to express a targeting moiety on their surface, or supplemented with desired biological activity. Development and validation of exosome-based drug delivery systems are the focus of this review. Different techniques of exosome isolation, characterization, drug loading, and applications in experimental disease models and clinic are discussed. Exosome-based drug formulations may be applied to a wide variety of disorders such as cancer, various infectious, cardiovascular, and neurodegenerative disorders. Overall, exosomes combine benefits of both synthetic nanocarriers and cell-mediated drug delivery systems while avoiding their limitations.
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              Eradication of established murine tumors using a novel cell-free vaccine: dendritic cell-derived exosomes.

              Dendritic cells (DCs) are professional antigen presenting cells with the unique capacity to induce primary and secondary immune responses in vivo. Here, we show that DCs secrete antigen presenting vesicles, called exosomes, which express functional Major Histocompatibility Complex class I and class II, and T-cell costimulatory molecules. Tumor peptide-pulsed DC-derived exosomes prime specific cytotoxic T lymphocytes in vivo and eradicate or suppress growth of established murine tumors in a T cell-dependent manner. Exosome-based cell-free vaccines represent an alternative to DC adoptive therapy for suppressing tumor growth.
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                Author and article information

                Contributors
                Journal
                Acta Pharm Sin B
                Acta Pharm Sin B
                Acta Pharmaceutica Sinica. B
                Elsevier
                2211-3835
                2211-3843
                08 March 2016
                July 2016
                08 March 2016
                : 6
                : 4
                : 287-296
                Affiliations
                [0005]Manchester University, College of Pharmacy, Natural & Health Sciences, Fort Wayne, IN 46845, USA
                Author notes
                [* ]Corresponding author. Tel.: +260 470 2748.Department of Pharmaceutical SciencesFort WayneIN46845USA vnadithe@ 123456manchester.edu
                [1]

                Present address: LECOM School of Pharmacy, 5000 Lakewood Ranch Blvd, Bradenton, FL 34211, USA.

                Article
                S2211-3835(15)30100-3
                10.1016/j.apsb.2016.02.001
                4951582
                27471669
                ada96da2-8e13-4561-abcc-bfcaa1bee8e8
                © 2016 Chinese Pharmaceutical Association and Institute of Materia Medica, Chinese Academy of Medical Sciences. Production and hosting by Elsevier B.V.

                This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).

                History
                : 23 December 2015
                : 19 January 2016
                : 26 January 2016
                Categories
                Review

                alix, alg-2 interacting protein x,atpase, adenosine triphosphatase,bbb, blood–brain barrier,cck-8, cell counting kit-8,cd, cluster of differentiation,dil, 1,1′-dioctadecyl-3,3,3′,3′-tetramethylindocarbocyanine perchlorate,dna, deoxyribonucleic acid,egf, epidermal growth factor,egfr, epidermal growth factor receptor,epcam, epithelial cell adhesion molecule,escrt, endosomal sorting complexes required for transport,ev, extracellular vesicle,hek293, human embryonic kidney cell line 293,hela, henrietta lacks cells,hiv, human immunodeficiency virus,hmga2, high-mobility group at-hook protein,hsp, heat shock proteins,il-6, interleukin-6,ilvs, intraluminal vesicles,kras, kirsten rat sarcoma,lps, lipopolysaccharides,mapk-1, mitogen-activated protein kinase 1,mhc, major histocompatibility complex,mirna, micro rna,mps, mononuclear phagocyte system,mrna, messenger rna,mvb, multi-vesicular body biogenesis,pbmc, peripheral blood mononuclear cells,pd, parkinson’s disease,peg, polyethylene glycol,rna, ribonucleic acid,ros, reactive oxygen species,rpe1, retinal pigment epithelial cells 1,sirna, small interference rna,tnf-α, tumor necrosis factor α,tsg101, tumor susceptibility gene 101,vps4, vacuolar protein sorting-associated protein 4,exosomes,nanocarrier,extracellular vesicles,drug delivery systems

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