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• W2001287918 abstract "HomeCirculation ResearchVol. 116, No. 8Exosomes Free AccessEditorialPDF/EPUBAboutView PDFView EPUBSections ToolsAdd to favoritesDownload citationsTrack citationsPermissions ShareShare onFacebookTwitterLinked InMendeleyReddit Jump toFree AccessEditorialPDF/EPUBExosomesNanosized Cellular Messages Yin Tintut and Linda L. Demer Yin TintutYin Tintut From the Department of Medicine (Y.T., L.L.D.), Department of Physiology (L.L.D.), and Department of Bioengineering (L.L.D.), UCLA. Search for more papers by this author and Linda L. DemerLinda L. Demer From the Department of Medicine (Y.T., L.L.D.), Department of Physiology (L.L.D.), and Department of Bioengineering (L.L.D.), UCLA. Search for more papers by this author Originally published10 Apr 2015https://doi.org/10.1161/CIRCRESAHA.115.306324Circulation Research. 2015;116:1281–1283Nature has designed clever ways for information and material transfer between cells and for intercellular coordination. Mechanisms include direct cell contact, gap junctions, and receptor-ligand signaling. In the past decade, a particular form of exchange has gained increasing attention, and that is intercellular transfer of extracellular vesicles—natural nanocarriers that deliver biological payloads at long range.1Article, see p 1312Many terms have been coined for vesicles found in the extracellular space, including matrix vesicles, extracellular membrane vesicles, microparticles,1 microvesicles,1,2 shedding vesicles,3 plasma membrane-derived vesicles,4 ectosomes,5 exovesicles,6 and exosomes.7 Sometimes these terms are used interchangeably, however, some have been assigned specific distinguishing features, such as size, context, or protein markers. Bone biologists showed decades ago that extracellular vesicles of a certain type, matrix vesicles, are central in skeletal mineralization, where they are thought to serve as a nidus for initiation of hydroxyapatite crystal formation.8 The general view is that matrix vesicles are formed by budding off from the plasma membrane. A leader in the field of matrix vesicle biology, Anderson,9 also identified matrix vesicles in human aortic calcification, one of the first demonstrations that vascular and bone mineralization occur by similar mechanisms.Exosomes, which are distinguished by endosomal marker proteins and their origin from a specialized endosomal pathway, arise in a wide variety of cell types, and serve many functions, such as removal of unwanted stress proteins and coordination of membrane biogenesis. They may have a role in disease processes. The payload of exosomes reportedly may include microRNA, proteins, and viral, bacterial, and prion particles.10–13Matrix vesicles and exosomes are found in other parts of the natural world. As with the hydroxyapatite mineral of bone, the calcium carbonate mineral encasing shellfish was previously thought to arise from matrix vesicles released only from cells of the mantle, a single-cell layer immediately adjacent to the shell’s mineralization front. This process has been studied in the Pacific oyster Crassostrea gigas. The recent sequencing of its genome (which, incidentally, has more genes14 than the human genome) allowed investigators to use proteomic analysis to show that blood cells from other parts of the organism, not just the mantle, deliver exosomes to the mineralization front, where they serve as nucleation sites. In addition to this unexpected mechanism, they found evidence that some exosomes may initiate mineralization even before release from the cells.15 Perhaps such mechanisms contribute to mineralization in mammals, and they could explain the frequent association of macrophage-like cells with sites of vascular calcification.Until now, matrix vesicles, defined as extracellular membrane-invested particles located within the matrix of mineralizing tissue and serving as a nidus for crystal initiation, were believed to form by polarized budding from the outer plasma membrane. At the same time, it has been known that the large extracellular protein, fetuin, which has an important role in inhibiting or limiting mineralization,16 is internalized and released within some sort of vesicles. In this issue of Circulation Research, Kapustin et al17 present evidence that both production of matrix vesicles and fetuin recycling involve the endosomal/exosomal pathway. The authors also demonstrate, by proteomic analysis, similarities between exosomes from vascular smooth muscle cells and the proteomic profile reported for skeletal osteoblasts. This provides additional support for the growing concept that vascular calcification recapitulates skeletal mineralization. However, it leaves, as an interesting puzzle, the question of how fetuin finds its way to the inside of an ordinary vesicle without having to cross its membrane.From a brief perusal of the literature, it seems that the biogenesis of exosomes occurs as shown in the Figure. During fluid-phase endocytosis (which the authors may have termed as liquid flow), the plasma membrane invaginates to take in extracellular fluid, which may contain particles or proteins, such as fetuin. The resulting endosomes contain extracellular-derived fluid and fetuin (white with dark gray objects). Some of these endosomes subsequently fuse with large multivesicular bodies (MVB), releasing their contents into the MVB. In the next step, the MVB membrane undergoes a secondary invagination, producing simple microvesicles (≈100 nm), which contain intracellular fluid contents (gray with black dots).Download figureDownload PowerPointFigure. Possible schematic of exosomal biogenesis. It seems that exosomes arise through a multistep process. Invagination of the plasma membrane during pinocytosis, or fluid-phase endocytosis, produces endosomes, which may contain, in addition to extracelluar-derived fluid (white), both extracellular-derived particles and proteins, such as fetuin (dark gray objects). Some endosomes then fuse with large multivesicular bodies (MVB; ≈700–1000 nm), which contain extracellular-derived fluid, fetuin, endosomal marker proteins (crescents), and microvesicles (≈100 nm). Simple microvesicles are formed by a secondary invagination involving the MVB membrane, and their contents include cytoplasmic fluid and proteins (gray with black dots). To account for the experimental observation of fetuin within extracellular vesicles, we speculate that some of the microvesicles may undergo a secondary invagination to engulf fetuin and, perhaps, endosomal marker proteins, to create a double vesicle, that is, a microvesicle-within-a-microvesicle (d). In the last stage of the endosomal–exosomal pathway, the MVB fuses with the plasma membrane, releasing extracellular-derived fluid, fetuin, endosomal marker proteins, and microvesicles into the extracellular space. Once in the extracellular milieu, the secreted microvesicles are known as exosomes. Based on the topology of this scheme, unless the hypothetical tertiary invagination took place and produced “double vesicles,” the exosomes should contain only intracellular-derived contents, and any fetuin would be released only in free form (without a surrounding membrane). Ultimately, the exosomes may be deposited onto collagen fibrils, where they are thought to serve as a nidus for mineralization. The presence of fetuin within the exosomes would delimit mineralization. If this hypothetical tertiary invagination concept is correct, barring dissolution of a membrane, one may predict that fetuin (and other large proteins and extracellular particles such as viruses) would not be found in simple exosomes, but only in complex exosomes, having 2 or a larger even number of layers between the fetuin and the extracellular space.At this stage, the fetuin is excluded from the simple microvesicles. It would be difficult to reconcile how Kapustin et al17 found fetuin inside vesicles in the extracellular matrix, unless we invoke an additional process. In 1 such hypothetical process, the MVB microvesicles would undergo a tertiary invagination: Fetuin (or other extracellular protein or particle) would be engulfed once again, this time by a microvesicle within the MVB. This would result in what we might term a “double vesicles,” that is, a microvesicle-within-a-microvesicle (d in Figure).Returning to the known exosomal biogenesis pathway, the final step is fusion of the MVB with the plasma membrane, releasing microvesicles that are, in this extracellular context, termed as exosomes together with fluid and free proteins or particles that were originally derived from the extracellular space. The exosomes would contain only intracellular-derived contents, and any fetuin would be released only in free form (without a surrounding membrane), unless the hypothetical tertiary invagination took place and produced double vesicles. If this hypothetical step is correct, barring dissolution of a membrane, one may predict that simple exosomes would not contain fetuin. It would be found only in complex exosomes, having 2, or a larger even number of layers, between the fetuin and the extracellular space.Interestingly, if it were to happen that a microvesicle in the MVB underwent multiple tertiary invaginations, the result would be a microvesicle containing multiple microvesicles. Once exocytosed, it would be an extracellular multivesicular body. Such structures have been described, as in the report by Yang et al18 of studies of zebrafish skeletal formation, which showed not only typical single-membrane matrix vesicles, but also multivesicular bodies in the extracellular matrix milieu.In addition to clinical relevance with respect to identifying therapeutic targets that may control cell processing of infectious agents, research on calcifying exosomes has inspired surface engineering of nanocomposites for targeted delivery of pharmaceuticals and other therapeutic agents. It turns out that exosomes coated with inorganic hydroxyapatite mineral have special properties that stabilize the nanoparticles and enhance targeting function. Biomimetic synthesis of organic–inorganic hybrid nanocarriers for targeted drug delivery has been performed using electrostatically absorbed hyaluronic acid as a reaction site for deposition of calcium phosphate mineral.19 Addition of such a hydroxyapatite jacket was found to confer the ability to target CD44 overexpressed cancer cells.20The findings of Kapustin et al17 suggest a more intricate mechanism of intracellular control and compartmentalization of biomineralization in smooth muscle cells than previously thought. In addition, a topological consideration of their finding, that exosomal matrix vesicles contain fetuin and endosomal marker proteins, suggests an additional mechanism, tertiary invagination to form “double vesicles,” as a necessary step for exosomal packaging of proteins or particles from the extracellular space, such as viruses, bacteria, or even prions.AcknowledgmentsThis work was supported in part by funding from the National Institutes of Health (DK081346 and HL114709).DisclosuresNone.FootnotesThe opinions expressed in this article are not necessarily those of the editors or of the American Heart Association.Correspondence to Linda Demer, MD, PhD, Departments of Medicine, Physiology, and Bioengineering, UCLA, 10833 LeConte Ave, Los Angeles, CA 90095-1679, E-mail [email protected]References1. Anderson HC, Mulhall D, Garimella R.Role of extracellular membrane vesicles in the pathogenesis of various diseases, including cancer, renal diseases, atherosclerosis, and arthritis.Lab Invest. 2010; 90:1549–1557. doi: 10.1038/labinvest.2010.152.CrossrefMedlineGoogle Scholar2. Muralidharan-Chari V, Clancy JW, Sedgwick A, D’Souza-Schorey C.Microvesicles: mediators of extracellular communication during cancer progression.J Cell Sci. 2010; 123:1603–1611. doi: 10.1242/jcs.064386.CrossrefMedlineGoogle Scholar3. Shedden K, Xie XT, Chandaroy P, Chang YT, Rosania GR.Expulsion of small molecules in vesicles shed by cancer cells: association with gene expression and chemosensitivity profiles.Cancer Res. 2003; 63:4331–4337.MedlineGoogle Scholar4. Kim KM.Calcification of matrix vesicles in human aortic valve and aortic media.Fed Proc. 1976; 35:156–162.MedlineGoogle Scholar5. 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Tintut Y, Hsu J and Demer L (2018) Lipoproteins in Cardiovascular Calcification: Potential Targets and Challenges, Frontiers in Cardiovascular Medicine, 10.3389/fcvm.2018.00172, 5 Wang P, Sun Y, Yang Y, Chen Y and Liu H (2021) Circ_0067835 Knockdown Enhances the Radiosensitivity of Colorectal Cancer by miR-296-5p/IGF1R Axis, OncoTargets and Therapy, 10.2147/OTT.S281011, Volume 14, (491-502) April 10, 2015Vol 116, Issue 8 Advertisement Article InformationMetrics © 2015 American Heart Association, Inc.https://doi.org/10.1161/CIRCRESAHA.115.306324PMID: 25858057 Originally publishedApril 10, 2015 Keywordsfetuinsmultivasicular bodiesEditorialsvascular calcificationexosomesPDF download Advertisement" @default.
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