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Expression and function of CCN2-derived circRNAs in chondrocytes.

Soma Kato1,2, Kazumi Kawata1, Takashi Nishida1

  • 1Department of Biochemistry and Molecular Dentistry, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, 2-5-1 Shikata-Cho, Kita-Ku, Okayama, 700-8525, Japan.

Journal of Cell Communication and Signaling
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Summary

Novel circular RNAs (circRNAs) derived from Cellular Communication Network Factor 2 (CCN2) are present in chondrocytes and influence chondrogenic differentiation, impacting aggrecan and proteoglycan synthesis.

Keywords:
ACANCCN2ChondrocyteChondrocytic differentiationCircular RNA

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Area of Science:

  • Molecular Biology
  • Cell Biology
  • Biochemistry

Background:

  • Cellular Communication Network Factor 2 (CCN2) is crucial for endochondral ossification and cartilage repair.
  • Circular RNAs (circRNAs) regulate gene expression and are known to derive from CCN2 in some cell types.
  • The presence and function of CCN2-derived circRNAs in chondrocytes are currently unknown.

Purpose of the Study:

  • To investigate the expression and function of CCN2-derived circRNAs in chondrocytes.
  • To identify novel CCN2-derived circRNAs in human chondrocytic cells.
  • To elucidate the role of these circRNAs in chondrogenic differentiation.

Main Methods:

  • RT-PCR analysis to detect and amplify CCN2-derived circRNAs in human chondrocytic HCS-2/8 cells.
  • Nucleotide sequencing to identify novel circRNAs.
  • Confirmation of circRNA expression in murine ATDC5 cells during chondrocytic differentiation.
  • siRNA-mediated knockdown of a specific CCN2-derived circRNA in HCS-2/8 cells.

Main Results:

  • Novel CCN2-derived circRNAs, distinct from previously known ones, were identified in HCS-2/8 cells.
  • Expression of several CCN2-derived circRNAs was confirmed in ATDC5 cells and varied with chondrocytic differentiation.
  • Knockdown of a CCN2-derived circRNA led to a significant decrease in aggrecan mRNA expression and proteoglycan synthesis.

Conclusions:

  • CCN2-derived circRNAs are expressed in chondrocytes.
  • These circRNAs play a significant role in chondrogenic differentiation.
  • CCN2-derived circRNAs are potential regulators of cartilage formation and regeneration.