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Extracellular vesicles as modulators of cell-to-cell communication in the healthy
and diseased brain
#MMPMID25135977
Pegtel DM
; Peferoen L
; Amor S
Philos Trans R Soc Lond B Biol Sci
2014[Sep]; 369
(1652
): ? PMID25135977
show ga
Homeostasis relies heavily on effective cell-to-cell communication. In the
central nervous system (CNS), probably more so than in other organs, such
communication is crucial to support and protect neurons especially during ageing,
as well as to control inflammation, remove debris and infectious agents. Emerging
evidence indicates that extracellular vesicles (EVs) including endosome-derived
exosomes and fragments of the cellular plasma membrane play a key role in
intercellular communication by transporting messenger RNA, microRNA (miRNA) and
proteins. In neurodegenerative diseases, secreted vesicles not only remove
misfolded proteins, but also transfer aggregated proteins and prions and are thus
thought to perpetuate diseases by 'infecting' neighbouring cells with these
pathogenic proteins. Conversely, in other CNS disorders signals from stressed
cells may help control inflammation and inhibit degeneration. EVs may also
reflect the status of the CNS and are present in the cerebrospinal fluid
indicating that exosomes may act as biomarkers of disease. That extracellular RNA
and in particular miRNA, can be transferred by EV also indicates that these
vesicles could be used as carriers to specifically target the CNS to deliver
immune modulatory drugs, neuroprotective agents and anti-cancer drugs. Here, we
discuss the recent evidence indicating the potential role of exosomes in
neurological disorders and how knowledge of their biology may enable a
Trojan-horse approach to deliver drugs into the CNS and treat neurodegenerative
and other disorders of the CNS.