The authors have no conflict of interests to declare.
Novel role of miR-181a in cartilage metabolism
Article first published online: 18 JUL 2013
Copyright © 2013 Wiley Periodicals, Inc.
Journal of Cellular Biochemistry
Volume 114, Issue 9, pages 2094–2100, September 2013
How to Cite
Sumiyoshi, K., Kubota, S., Ohgawara, T., Kawata, K., Abd El Kader, T., Nishida, T., Ikeda, N., Shimo, T., Yamashiro, T. and Takigawa, M. (2013), Novel role of miR-181a in cartilage metabolism. J. Cell. Biochem., 114: 2094–2100. doi: 10.1002/jcb.24556
- Issue published online: 18 JUL 2013
- Article first published online: 18 JUL 2013
- Accepted manuscript online: 1 APR 2013 12:41AM EST
- Manuscript Accepted: 18 MAR 2013
- Manuscript Received: 20 FEB 2013
- Japan Society for the Promotion of Science. Grant Numbers: 19109008, 24390415, 21592360
- CCN FAMILY;
- GENE REGULATION;
Micro RNA (miRNA) is a small non-coding post-transcriptional RNA regulator that is involved in a variety of biological events. In order to specify the role of miRNAs in cartilage metabolism, we comparatively analyzed the expression profile of known miRNAs in chicken sternum chondrocytes representing early and late differentiation stages. Interestingly, none of the miRNAs displaying strong expression levels showed remarkable changes along with differentiation, suggesting their roles in maintaining the homeostasis rather than cytodifferentiation of chondrocytes. Among these miRNAs, miR-181a, which is known to play critical roles in a number of tissues, was selected and was further characterized. Human microarray analysis revealed remarkably stronger expression of miR-181a in human HCS-2/8 cells, which strongly maintained a chondrocytic phenotype, than in HeLa cells, indicating its significant role in chondrocytes. Indeed, subsequent investigation indicated that miR-181a repressed the expression of two genes involved in cartilage development. One was CCN family member 1 (CCN1), which promotes chondrogenesis; and the other, the gene encoding the core protein of aggrecan, a major cartilaginous proteoglycan, aggrecan. Based on these findings, negative feedback system via miR-181a to conserve the integrity of the cartilaginous phenotype may be proposed. J. Cell. Biochem. 114: 2094–2100, 2013. © 2013 Wiley Periodicals, Inc.