En bloc release of MVB-like small extracellular vesicle clusters by colorectal carcinoma cells

Small extracellular vesicles (EVs) are membrane enclosed structures that are usually released from cells upon exocytosis of multivesicular bodies (MVBs) as a collection of separate, free EVs. In this study, we analysed paraffin embedded sections of archived human colorectal cancer samples. We studie...

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Veröffentlicht in:Journal of extracellular vesicles 2019-12, Vol.8 (1), p.1596668-n/a
Hauptverfasser: Valcz, Gábor, Buzás, Edit I., Kittel, Ágnes, Krenács, Tibor, Visnovitz, Tamás, Spisák, Sándor, Török, György, Homolya, László, Zsigrai, Sára, Kiszler, Gábor, Antalffy, Géza, Pálóczi, Krisztina, Szállási, Zoltán, Szabó, Vanessza, Sebestyén, Anna, Solymosi, Norbert, Kalmár, Alexandra, Dede, Kristóf, Lőrincz, Péter, Tulassay, Zsolt, Igaz, Péter, Molnár, Béla
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container_title Journal of extracellular vesicles
container_volume 8
creator Valcz, Gábor
Buzás, Edit I.
Kittel, Ágnes
Krenács, Tibor
Visnovitz, Tamás
Spisák, Sándor
Török, György
Homolya, László
Zsigrai, Sára
Kiszler, Gábor
Antalffy, Géza
Pálóczi, Krisztina
Szállási, Zoltán
Szabó, Vanessza
Sebestyén, Anna
Solymosi, Norbert
Kalmár, Alexandra
Dede, Kristóf
Lőrincz, Péter
Tulassay, Zsolt
Igaz, Péter
Molnár, Béla
description Small extracellular vesicles (EVs) are membrane enclosed structures that are usually released from cells upon exocytosis of multivesicular bodies (MVBs) as a collection of separate, free EVs. In this study, we analysed paraffin embedded sections of archived human colorectal cancer samples. We studied 3D reconstructions of confocal microscopic images complemented by HyVolution and STED imaging. Unexpectedly, we found evidence that large, MVB-like aggregates of ALIX/CD63 positive EV clusters were released en bloc by migrating tumour cells. These structures were often captured with partial or complete extra-cytoplasmic localization at the interface of the plasma membrane of the tumour cell and the stroma. Their diameter ranged between 0.62 and 1.94 μm (mean±S.D.: 1.17 ± 0.34 μm). High-resolution 3D reconstruction showed that these extracellular MVB-like EV clusters were composed of distinguishable internal particles of small EV size (mean±S.D.: 128.96 ± 16.73 nm). In vitro, HT29 colorectal cancer cells also showed the release of similar structures as confirmed by immunohistochemistry and immune electron microscopy. Our results provide evidence for an en bloc transmission of MVB-like EV clusters through the plasma membrane. Immunofluorescent-based detection of the MVB like small EV clusters in archived pathological samples may represent a novel and unique opportunity which enables analysis of EV release in situ in human tissues.
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source Taylor & Francis Open Access; DOAJ Directory of Open Access Journals; Wiley Online Library Journals Frontfile Complete; Co-Action Open Access Journals; Elektronische Zeitschriftenbibliothek - Frei zugängliche E-Journals; Wiley Online Library Open Access; PubMed Central
subjects Antibodies
Antigens
Binding sites
Cancer
CD63 antigen
Cell culture
Colorectal carcinoma
Cytokeratin
Electron microscopy
Exocytosis
Extracellular vesicles
Immunohistochemistry
Laboratories
Localization
Membrane vesicles
Microscopy
migrating cancer cells
MVB
Proteins
Stroma
Tumors
title En bloc release of MVB-like small extracellular vesicle clusters by colorectal carcinoma cells
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