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2016 ; 88
(ä): 47-55
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Selective enrichment of microRNAs in extracellular matrix vesicles produced by
growth plate chondrocytes
#MMPMID27080510
Lin Z
; Rodriguez NE
; Zhao J
; Ramey AN
; Hyzy SL
; Boyan BD
; Schwartz Z
Bone
2016[Jul]; 88
(ä): 47-55
PMID27080510
show ga
Matrix vesicles (MVs) are membrane organelles found in the extracellular matrix
of calcifying cells, which contain matrix processing enzymes and regulate the
extracellular environment via action of these enzymes. It is unknown whether MVs
are also exosomic mediators of cell-cell communication via transfer of RNA
material, and specifically, microRNA (miRNA). We investigated the presence of RNA
in MVs isolated from cultures of costochondral growth zone chondrocytes. Our
results showed that the average yield of MV RNA was 1.93±0.78ng RNA/10(4) cells,
which was approximately 0.1% of the parent cell's total RNA. MV RNA was
well-protected from RNase by the lipid membrane and was highly enriched in small
RNA molecules compared to cells. Moreover, coding and non-coding small RNAs in
MVs were in proportions that differed from parent cells. Enrichment of specific
miRNAs was consistently observed in all three miRNA detection platforms that we
used, suggesting that miRNAs are selectively packaged into MVs. MV-enriched
miRNAs were related to different signaling pathways associated with bone
formation. This study suggests a significant role for MVs as "matrisomes" in
cell-cell communication in cartilage and bone development via transfer of
specific miRNAs.