Low Shear Stress Attenuates COX-2 Expression Induced by Resistin in Human Osteoarthritic Chondrocytes

Yu Ping Su, Cheng Nan Chen, Hsin I. Chang, Kuo Chin Huang, Chin Chang Cheng, Fang Yao Chiu, Ko Chao Lee, Chun Min Lo*, Shun Fu Chang

*Corresponding author for this work

Research output: Contribution to journalJournal Article peer-review

13 Scopus citations

Abstract

Low shear stress has been proposed to play a reparative role in modulating cartilage homeostasis. Recently, epidemiological studies have found a positive correlation between the resistin level in serum and synovial fluid and osteoarthritis (OA) severity in patients. However, the effect of moderate shear stress on the catabolic stimulation of resistin in OA chondrocytes remains unclear. Hence, this study was to investigate whether low shear stress could regulate resistin-induced catabolic cyclooxygenase (COX)-2 expression in human OA chondrocytes and the underlying mechanism. Human OA chondrocytes and SW1353 chondrosarcoma cells were used in this study. Two modes of low shear stress (2 dyn/cm2), pre-shear and post-shear, were applied to the chondrocytes. A specific activator and siRNAs were used to investigate the mechanism of low shear stress-regulated COX-2 expression of resistin induction. We found that human OA chondrocytes exposed to different modes of low shear stress elicit an opposite effect on resistin-induced COX-2 expression: pre-shear for a short duration attenuates the resistin effect by inhibiting the transcription factor nuclear factor (NF)-κB-p65 subunit and the cAMP response element binding protein; however, post-shear over a longer duration enhances the resistin effect by activating only the NF-κB-p65 subunit. Moreover, our results demonstrated that the regulation of both shear modes in resistin-stimulated COX-2 expression occurs through increasing AMP-activated protein kinase activation and then sirtuin 1 expression. This study elucidates the detailed mechanism of low shear stress regulating the resistin-induced catabolic COX-2 expression and indicates a possible reparative role of moderate shear force in resistin-stimulated OA development. J. Cell. Physiol. 232: 1448–1457, 2017.

Original languageEnglish
Pages (from-to)1448-1457
Number of pages10
JournalJournal of Cellular Physiology
Volume232
Issue number6
DOIs
StatePublished - 01 06 2017
Externally publishedYes

Bibliographical note

Publisher Copyright:
© 2016 Wiley Periodicals, Inc.

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