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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 J+Extracell+Vesicles
2015 ; 4
(ä): 26760
Nephropedia Template TP
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Quantitative and qualitative analysis of small RNAs in human endothelial cells
and exosomes provides insights into localized RNA processing, degradation and
sorting
#MMPMID26027894
van Balkom BW
; Eisele AS
; Pegtel DM
; Bervoets S
; Verhaar MC
J Extracell Vesicles
2015[]; 4
(ä): 26760
PMID26027894
show ga
Exosomes are small vesicles that mediate cell-cell communication. They contain
proteins, lipids and RNA, and evidence is accumulating that these molecules are
specifically sorted for release via exosomes. We recently showed that
endothelial-cell-produced exosomes promote angiogenesis in vivo in a small
RNA-dependent manner. Recent deep sequencing studies in exosomes from lymphocytic
origin revealed a broad spectrum of small RNAs. However, selective depletion or
incorporation of small RNA species into endothelial exosomes has not been studied
extensively. With next generation sequencing, we identified all known non-coding
RNA classes, including microRNAs (miRNAs), small nucleolar RNAs, yRNAs, vault
RNAs, 5p and 3p fragments of miRNAs and miRNA-like fragments. In addition, we
mapped many fragments of messenger RNAs (mRNAs) and mitochondrial RNAs (mtRNAs).
The distribution of small RNAs in exosomes revealed a considerable overlap with
the distribution in the producing cells. However, we identified a remarkable
enrichment of yRNA fragments and mRNA degradation products in exosomes consistent
with yRNAs having a role in degradation of structured and misfolded RNAs in close
proximity to endosomes. We propose that endothelial endosomes selectively
sequester cytoplasmic RNA-degrading machineries taking part in gene regulation.
The release of these regulatory RNAs via exosomes may have implications for
endothelial cell-cell communication.