Role of Sox9 in growth factor regulation of articular chondrocytes

Shuiliang Shi, Congrong Wang, Anthony J. Acton, George J. Eckert, Stephen B. Trippel

Research output: Contribution to journalArticle

19 Citations (Scopus)

Abstract

Chondrogenic polypeptide growth factors influence articular chondrocyte functions that are required for articular cartilage repair. Sox9 is a transcription factor that regulates chondrogenesis, but its role in the growth factor regulation of chondrocyte proliferation and matrix synthesis is poorly understood. We tested the hypotheses that selected chondrogenic growth factors regulate sox9 gene expression and protein production by adult articular chondrocytes and that sox9 modulates the actions of these growth factors. To test these hypotheses, we delivered insulin-like growth factor-I (IGF-I), fibroblast growth factor-2 (FGF-2), bone morphogenetic protein-2 (BMP-2) and/or bone morphogenetic protein-7 (BMP-7), or their respective transgenes to adult bovine articular chondrocytes, and measured changes in sox9 gene expression and protein production. We then knocked down sox9 gene expression with sox9 siRNA, and measured changes in the expression of the genes encoding aggrecan and types I and II collagen, and in the production of glycosaminoglycan, collagen and DNA. We found that FGF-2 or the combination of IGF-I, BMP-2, and BMP-7 increased sox9 gene expression and protein production and that sox9 knockdown modulated growth factor actions in a complex fashion that differed both with growth factors and with chondrocyte function. The data suggest that sox9 mediates the stimulation of matrix production by the combined growth factors and the stimulation of chondrocyte proliferation by FGF-2. The mitogenic effect of the combined growth factors and the catabolic effect of FGF-2 appear to involve sox9-independent mechanisms. Control of these molecular mechanisms may contribute to the treatment of cartilage damage. J. Cell. Biochem. 116: 1391-1400, 2015.

Original languageEnglish (US)
Pages (from-to)1391-1400
Number of pages10
JournalJournal of Cellular Biochemistry
Volume116
Issue number7
DOIs
StatePublished - Jul 1 2015

Fingerprint

Chondrocytes
Intercellular Signaling Peptides and Proteins
Joints
Fibroblast Growth Factor 2
Gene expression
Gene Expression
Bone Morphogenetic Protein 7
Bone Morphogenetic Protein 2
Cartilage
Insulin-Like Growth Factor I
Aggrecans
Chondrogenesis
Proteins
Gene encoding
Collagen Type II
Articular Cartilage
Collagen Type I
Glycosaminoglycans
Transgenes
Small Interfering RNA

Keywords

  • ARTICULAR CHONDROCYTES
  • GROWTH FACTORS
  • SMALL INHIBITORY RNA
  • sox9

ASJC Scopus subject areas

  • Biochemistry
  • Cell Biology
  • Molecular Biology

Cite this

Shi, S., Wang, C., Acton, A. J., Eckert, G. J., & Trippel, S. B. (2015). Role of Sox9 in growth factor regulation of articular chondrocytes. Journal of Cellular Biochemistry, 116(7), 1391-1400. https://doi.org/10.1002/jcb.25099

Role of Sox9 in growth factor regulation of articular chondrocytes. / Shi, Shuiliang; Wang, Congrong; Acton, Anthony J.; Eckert, George J.; Trippel, Stephen B.

In: Journal of Cellular Biochemistry, Vol. 116, No. 7, 01.07.2015, p. 1391-1400.

Research output: Contribution to journalArticle

Shi, S, Wang, C, Acton, AJ, Eckert, GJ & Trippel, SB 2015, 'Role of Sox9 in growth factor regulation of articular chondrocytes', Journal of Cellular Biochemistry, vol. 116, no. 7, pp. 1391-1400. https://doi.org/10.1002/jcb.25099
Shi, Shuiliang ; Wang, Congrong ; Acton, Anthony J. ; Eckert, George J. ; Trippel, Stephen B. / Role of Sox9 in growth factor regulation of articular chondrocytes. In: Journal of Cellular Biochemistry. 2015 ; Vol. 116, No. 7. pp. 1391-1400.
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