Volume 52, Issue 3 pp. 800-809
Research Article

Hyaluronan oligosaccharide–induced activation of transcription factors in bovine articular chondrocytes

Shigeru Ohno

Shigeru Ohno

Rush Medical College, Rush University Medical Center, Chicago, Illinois

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Hee-Jeong Im

Hee-Jeong Im

Rush Medical College, Rush University Medical Center, Chicago, Illinois

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Cheryl B. Knudson

Cheryl B. Knudson

Rush Medical College, Rush University Medical Center, Chicago, Illinois

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Warren Knudson

Corresponding Author

Warren Knudson

Rush Medical College, Rush University Medical Center, Chicago, Illinois

Department of Biochemistry, Rush Medical College, Rush University Medical Center, 1653 West Congress Parkway, Chicago, IL 60612Search for more papers by this author
First published: 04 March 2005
Citations: 46

Abstract

Objective

To document the activity profile of transcription factors following chondrocyte stimulation with hyaluronan (HA) hexasaccharides (HA6) and to determine the expression of genes whose transcriptional activation is tightly associated with the transcription factors.

Methods

Nuclear extracts from bovine articular chondrocytes treated with HA6 were subjected to transcription factor protein–DNA array analysis. Electrophoretic mobility shift assay (EMSA) analyses were performed to confirm the results of protein–DNA array. The gene expressions of matrix metalloproteinase 3 (MMP-3), type II collagen, and cartilage oligomeric matrix protein (COMP) were examined by quantitative real-time reverse transcription–polymerase chain reaction (RT-PCR), and protease activity was assessed by casein zymography.

Results

In the protein–DNA array analysis, 12 transcription factors were up-regulated and 2 transcription factors were down-regulated in the chondrocytes treated with HA6. The transcription factors retinoic acid receptor (RAR), retinoid X receptor (RXR), and Sp-1 exhibited >2-fold increased activity by HA6 treatment, as confirmed by EMSA. RT-PCR analysis showed that the expression levels of MMP-3, type II collagen, and COMP messenger RNA, which are tightly associated with the activation of RAR, RXR, or Sp-1, were up-regulated by treatment with HA6. Addition of high molecular mass HA after HA6 treatment resulted in abrogation of the MMP-3 induction.

Conclusion

These results suggest that HA6 increase the activity of multiple transcription factors in chondrocytes and signal the enhanced expression of key genes involved in cartilage-matrix remodeling and turnover. The data also demonstrate that high molecular mass HA has a potential to suppress the signaling activated by HA6.

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