Faculty, Staff and Student Publications

Language

English

Publication Date

6-1-2025

Journal

Journal of Extracellular Vesicles

DOI

10.1002/jev2.70100

PMID

40439163

PMCID

PMC12120566

PubMedCentral® Posted Date

5-29-2025

PubMedCentral® Full Text Version

Post-print

Abstract

Neuronal extracellular vesicles (microvesicles and exosomes) are emerging secreted vesicular signals that play important roles in the CNS. Currently, little is known about how glutamatergic signalling affects the subcellular localisation of exosome precursor intraluminal vesicles (ILVs), microRNA (miR) packaging into ILVs and in vivo spreading of neuronal EVs. By selectively labelling ILVs and exosomes (but not plasma membrane-derived MVs) with GFP-tagged human CD63 (hCD63-GFP) in cortical neurons, we found that glutamate stimulation significantly redistributes subcellular localisation of hCD63-GFP+ ILVs, especially decreasing its co-localisation with multi-vesicular body (MVB) marker Rab7 while substantially promoting EV secretion. Interestingly, glutamate stimulation only modestly alters EV miR profiles based on small RNA sequencing. Subsequent in vivo cortical neuronal DREADD activation leads to significantly more widespread hCD63-GFP+ area in hCD63-GFPf/+ mice, consistently supporting the stimulatory effect of glutamatergic activation on neuronal EV secretion and spreading. Moreover, in situ localisation of hCD63-GFP+ ILVs and hCD63-GFP+ secreted exosomes from specialised HB9+ and DAT+ neurons were also illustrated in the CNS. Taken together, our results demonstrated that glutamate activity stimulates neuronal exosome secretion and spreading in vitro and in vivo, but only modestly affects miR cargo packaging in neuronal exosomes.

Keywords

Animals, MicroRNAs, Neurons, Extracellular Vesicles, Mice, Humans, Cerebral Cortex, Exosomes, Glutamic Acid, Tetraspanin 30, Cells, Cultured, CD63, extracellular vesicles, glutamate stimulation, intraluminal vesicles (ILVs), microRNA

Published Open-Access

yes

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