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Lookup NU author(s): Dr Matthew Barter,
Dr Rodolfo Gomez,
Dr Graham Smith,
Dr Daryl Shanley,
Professor David YoungORCiD
This work is licensed under a Creative Commons Attribution 4.0 International License (CC BY 4.0).
microRNAs (miRNAs) are abundantly expressed in development where they are critical determinants of cell differentiation and phenotype. Accordingly miRNAs are essential for normal skeletal development and chondrogenesis in particular. However the question of which miRNAs are specific to the chondrocyte phenotype has not been fully addressed. Using microarray analysis of miRNA expression during mesenchymal stem cell chondrogenic differentiation and detailed examination of the role of essential differentiation factors, such as SOX9, TGF-β and the cell condensation phase, we characterise the repertoire of specific miRNAs involved in chondrocyte development, highlighting in particular miR-140 and miR-455. Further with the use of mRNA microarray data we integrate miRNA expression and mRNA expression during chondrogenesis to underline the particular importance of miR-140, especially the -5p strand. We provide a detailed identification and validation of direct targets of miR-140-5p in both chondrogenesis and adult chondrocytes with the use of microarray and 3’UTR analysis. This emphasises the diverse array of targets and pathways regulated by miR-140-5p. We are also able to confirm previous experimentally identified targets but, additionally, identify a novel positive regulation of the Wnt signalling pathway by miR-140-5p. Wnt signalling has a complex role in chondrogenesis and skeletal development and these findings illustrate a previously unidentified role for miR-140-5p in regulation of Wnt signalling in these processes. Together these developments further highlight the role of miRNAs during chondrogenesis to improve our understanding of chondrocyte development and guide cartilage tissue engineering.
Author(s): Barter MJ, Tselepi M, Gomez R, Woods S, Hui W, Smith GR, Shanley DP, Clark IM, Young DA
Publication type: Article
Publication status: Published
Journal: Stem Cells
Print publication date: 01/11/2015
Online publication date: 29/07/2015
Acceptance date: 01/06/2015
Date deposited: 29/07/2015
ISSN (print): 1066-5099
ISSN (electronic): 1549-4918
Publisher: AlphaMed Press, Inc.
PubMed id: 26175215
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