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2014 ; 369
(1652
): ä Nephropedia Template TP
gab.com Text
Twit Text FOAVip
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English Wikipedia
Multifaceted effects of oligodendroglial exosomes on neurons: impact on neuronal
firing rate, signal transduction and gene regulation
#MMPMID25135971
Fröhlich D
; Kuo WP
; Frühbeis C
; Sun JJ
; Zehendner CM
; Luhmann HJ
; Pinto S
; Toedling J
; Trotter J
; Krämer-Albers EM
Philos Trans R Soc Lond B Biol Sci
2014[Sep]; 369
(1652
): ä PMID25135971
show ga
Exosomes are small membranous vesicles of endocytic origin that are released by
almost every cell type. They exert versatile functions in intercellular
communication important for many physiological and pathological processes.
Recently, exosomes attracted interest with regard to their role in cell-cell
communication in the nervous system. We have shown that exosomes released from
oligodendrocytes upon stimulation with the neurotransmitter glutamate are
internalized by neurons and enhance the neuronal stress tolerance. Here, we
demonstrate that oligodendroglial exosomes also promote neuronal survival during
oxygen-glucose deprivation, a model of cerebral ischaemia. We show the transfer
from oligodendrocytes to neurons of superoxide dismutase and catalase, enzymes
which are known to help cells to resist oxidative stress. Additionally, we
identify various effects of oligodendroglial exosomes on neuronal physiology.
Electrophysiological analysis using in vitro multi-electrode arrays revealed an
increased firing rate of neurons exposed to oligodendroglial exosomes. Moreover,
gene expression analysis and phosphorylation arrays uncovered differentially
expressed genes and altered signal transduction pathways in neurons after exosome
treatment. Our study thus provides new insight into the broad spectrum of action
of oligodendroglial exosomes and their effects on neuronal physiology. The
exchange of extracellular vesicles between neural cells may exhibit remarkable
potential to impact brain performance.