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2016 ; 6
(3
): 292-301
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MicroRNAs for Fine-Tuning of Mouse Embryonic Stem Cell Fate Decision through
Regulation of TGF-? Signaling
#MMPMID26876669
Hadjimichael C
; Nikolaou C
; Papamatheakis J
; Kretsovali A
Stem Cell Reports
2016[Mar]; 6
(3
): 292-301
PMID26876669
show ga
Over the past years, microRNAs (miRNAs) have emerged as crucial factors that
regulate self-renewal and differentiation of embryonic stem cells (ESCs).
Although much is known about their role in maintaining ESC pluripotency, the
mechanisms by which they affect cell fate decisions remain poorly understood. By
performing deep sequencing to profile miRNA expression in mouse ESCs (mESCs) and
differentiated embryoid bodies (EBs), we identified four differentially expressed
miRNAs. Among them, miR-191 and miR-16-1 are highly expressed in ESCs and repress
Smad2, the most essential mediator of Activin-Nodal signaling, resulting in the
inhibition of mesendoderm formation. miR-23a, which is also down-regulated in the
differentiated state, suppresses differentiation toward the endoderm and ectoderm
lineages. We further identified miR-421 as a differentiation-associated regulator
through the direct repression of the core pluripotency transcription factor Oct4
and the bone morphogenetic protein (BMP)-signaling components, Smad5 and Id2.
Collectively, our findings uncover a regulatory network between the studied
miRNAs and both branches of TGF-?/BMP-signaling pathways, revealing their
importance for ESC lineage decisions.
|*Cell Lineage
[MESH]
|*Signal Transduction
[MESH]
|Animals
[MESH]
|Bone Morphogenetic Proteins/metabolism
[MESH]
|Cell Differentiation
[MESH]
|Cell Line
[MESH]
|Embryonic Stem Cells/cytology/*metabolism
[MESH]
|Inhibitor of Differentiation Protein 2/metabolism
[MESH]