VAMP-associated protein-A and oxysterol-binding protein-related protein 3 promote the entry of late endosomes into the nucleoplasmic reticulum

Research output: Contribution to journalResearch articleContributedpeer-review

Contributors

Abstract

The endocytic pathway plays an instrumental role in recycling internalized molecules back to the plasma membrane or in directing them to lysosomes for degradation. We recently reported a new role of endosomes-the delivery of components from extracellular vesicles (EVs) to the nucleoplasm of recipient cells. Using indirect immunofluorescence, FRET, immunoisolation techniques, and RNAi, we report here a tripartite protein complex (referred to as the VOR complex) that is essential for the nuclear transfer of EV-derived components by orchestrating the specific localization of late endosomes into nucleoplasmic reticulum. We found that the VOR complex contains the endoplasmic reticulum-localized vesicle-associated membrane protein (VAMP)-associated protein A (VAP-A), the cytoplasmic oxysterol-binding protein-related protein 3 (ORP3), and late endosome-associated small GTPase Rab7. The silencing of VAP-A or ORP3 abrogated the association of Rab7-positive late endosomes with nuclear envelope invaginations and, hence, the transport of endocytosed EV-derived components to the nucleoplasm of recipient cells. We conclude that the VOR complex can be targeted to inhibit EV-mediated intercellular communication, which can have therapeutic potential for managing cancer in which the release of EVs is dysregulated.

Details

Original languageEnglish
Pages (from-to)13834-13848
Number of pages15
JournalThe Journal of biological chemistry
Volume293
Issue number36
Publication statusPublished - 7 Sept 2018
Peer-reviewedYes

External IDs

PubMedCentral PMC6130944
Scopus 85053011563
ORCID /0000-0001-5624-1717/work/142239012
ORCID /0000-0003-1181-3659/work/142252247
ORCID /0000-0001-7687-0983/work/142253727

Keywords

Sustainable Development Goals

Keywords

  • Carrier Proteins/physiology, Cell Communication, Cells, Cultured, Endocytosis, Endoplasmic Reticulum/metabolism, Endosomes/metabolism, Fatty Acid-Binding Proteins, Humans, Multiprotein Complexes/chemistry, Nuclear Envelope/metabolism, R-SNARE Proteins, Receptors, Steroid, Vesicular Transport Proteins/physiology, rab GTP-Binding Proteins/metabolism, rab7 GTP-Binding Proteins