Novel role of miR-181a in cartilage metabolism

Kumi Sumiyoshi, Satoshi Kubota, Toshihiro Ohgawara, Kazumi Kawata, Tarek Abd El Kader, Takashi Nishida, Nao Ikeda, Tsuyoshi Shimo, Takashi Yamashiro, Masaharu Takigawa

Research output: Contribution to journalArticlepeer-review

26 Citations (Scopus)


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.

Original languageEnglish
Pages (from-to)2094-2100
Number of pages7
JournalJournal of Cellular Biochemistry
Issue number9
Publication statusPublished - Sep 2013


  • CCN1
  • miRNA

ASJC Scopus subject areas

  • Biochemistry
  • Molecular Biology
  • Cell Biology


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