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J Extracell Vesicles. 2014 Aug 04;3. doi: 10.3402/jev.v3.24641. eCollection 2014.

Routes and mechanisms of extracellular vesicle uptake.

Journal of extracellular vesicles

Laura Ann Mulcahy, Ryan Charles Pink, David Raul Francisco Carter, Scholte

Affiliations

  1. Department of Biological and Medical Science, Faculty of Health and Life Sciences, Oxford Brookes University, Oxford, UK.

PMID: 25143819 PMCID: PMC4122821 DOI: 10.3402/jev.v3.24641

Abstract

Extracellular vesicles (EVs) are small vesicles released by donor cells that can be taken up by recipient cells. Despite their discovery decades ago, it has only recently become apparent that EVs play an important role in cell-to-cell communication. EVs can carry a range of nucleic acids and proteins which can have a significant impact on the phenotype of the recipient. For this phenotypic effect to occur, EVs need to fuse with target cell membranes, either directly with the plasma membrane or with the endosomal membrane after endocytic uptake. EVs are of therapeutic interest because they are deregulated in diseases such as cancer and they could be harnessed to deliver drugs to target cells. It is therefore important to understand the molecular mechanisms by which EVs are taken up into cells. This comprehensive review summarizes current knowledge of EV uptake mechanisms. Cells appear to take up EVs by a variety of endocytic pathways, including clathrin-dependent endocytosis, and clathrin-independent pathways such as caveolin-mediated uptake, macropinocytosis, phagocytosis, and lipid raft-mediated internalization. Indeed, it seems likely that a heterogeneous population of EVs may gain entry into a cell via more than one route. The uptake mechanism used by a given EV may depend on proteins and glycoproteins found on the surface of both the vesicle and the target cell. Further research is needed to understand the precise rules that underpin EV entry into cells.

Keywords: EV internalization; EV uptake; cell communication; cell–EV interaction; endocytosis; exosomes; extracellular vesicles

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