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Embryonic Stem Cells/Induced Pluripotent Stem Cells
Article first published online: 12 FEB 2013
Copyright © 2012 AlphaMed Press
Volume 31, Issue 2, pages 259–268, February 2013
How to Cite
Hu, S., Wilson, K. D., Ghosh, Z., Han, L., Wang, Y., Lan, F., Ransohoff, K. J., Burridge, P. and Wu, J. C. (2013), MicroRNA-302 Increases Reprogramming Efficiency via Repression of NR2F2. STEM CELLS, 31: 259–268. doi: 10.1002/stem.1278
Author contribution: S.H.: conception and design, collection and/or assembly of data, data analysis and interpretation, manuscript writing; K.D.W. and Z.G.: conception and design, collection and/or assembly of data, data analysis and interpretation; L.H. and F.L.: collection and/or assembly of data, data analysis and interpretation; Y.W.: data analysis and interpretation; K.J.R.: collection and/or assembly of data; P. B.: design; and J.C.W.: conception and design, data analysis and interpretation, financial support.
Disclosure of potential conflicts of interest is found at the end of this article.
First published online in STEM CELLSEXPRESS November 8, 2012.
- Issue published online: 12 FEB 2013
- Article first published online: 12 FEB 2013
- Accepted manuscript online: 8 NOV 2012 06:54AM EST
- Manuscript Accepted: 9 OCT 2012
- Manuscript Received: 30 JUN 2012
- Burroughs Wellcome Foundation. Grant Numbers: NIH DP2OD004437, R01 HL113006, RC1 AG036142
- Foudation Leducq 11CVD02
- AHA Postdoctoral fellowship. Grant Number: 10POST3730079
- Induced pluripotent stem cells;
MicroRNAs (miRNAs) have emerged as critical regulators of gene expression through translational inhibition and RNA decay and have been implicated in the regulation of cellular differentiation, proliferation, angiogenesis, and apoptosis. In this study, we analyzed global miRNA and mRNA microarrays to predict novel miRNA-mRNA interactions in human embryonic stem cells and induced pluripotent stem cells (iPSCs). In particular, we demonstrate a regulatory feedback loop between the miR-302 cluster and two transcription factors, NR2F2 and OCT4. Our data show high expression of miR-302 and OCT4 in pluripotent cells, while NR2F2 is expressed exclusively in differentiated cells. Target analysis predicts that NR2F2 is a direct target of miR-302, which we experimentally confirm by reporter luciferase assays and real-time polymerase chain reaction. We also demonstrate that NR2F2 directly inhibits the activity of the OCT4 promoter and thus diminishes the positive feedback loop between OCT4 and miR-302. Importantly, higher reprogramming efficiencies were obtained when we reprogrammed human adipose-derived stem cells into iPSCs using four factors (KLF4, C-MYC, OCT4, and SOX2) plus miR-302 (this reprogramming cocktail is hereafter referred to as “KMOS3”) when compared to using four factors (“KMOS”). Furthermore, shRNA knockdown of NR2F2 mimics the over-expression of miR-302 by also enhancing reprogramming efficiency. Interestingly, we were unable to generate iPSCs from miR-302a/b/c/d alone, which is in contrast to previous publications that have reported that miR-302 by itself can reprogram human skin cancer cells and human hair follicle cells. Taken together, these findings demonstrate that miR-302 inhibits NR2F2 and promotes pluripotency through indirect positive regulation of OCT4. This feedback loop represents an important new mechanism for understanding and inducing pluripotency in somatic cells. STEM CELLS2013;31:259–268