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p38 Kinase Regulates Nitric Oxide-induced Dedifferentiation and Cyclooxygenase-2 Expression of Articular Chondrocytes

Yu, Seon-Mi   (Department of Biological Sciences, Kongju National University, College of Natural SciencesUU0000178  ); Cheong, Seon-Woo   (Department of Biology, College of Natural Sciences, Changwon National UniversityUU0001233  ); Cho, Sam-Rae   (Department of Biological Sciences, Kongju National University, College of Natural SciencesUU0000178  ); Kim, Song-Ja   (Department of Biological Sciences, Kongju National University, College of Natural SciencesUU0000178  );
  • 초록

    Background: Caveolin, a family of integral membrane proteins are a principal component of caveolae membranes. In this study, we investigated the effect of p38 kinase on differentiation and on inflammatory responses in sodium nitroprusside (SNP)-treated chondrocytes. Methods: Rabbit articular chondrocytes were prepared from cartilage slices of 2-week-old New Zealand white rabbits by enzymatic digestion. SNP was used as a nitric oxide (NO) donor. In this experiments measuring SNP dose response, primary chondrocytes were treated with various concentrations of SNP for 24h. The time course of the SNP response was determined by incubating cells with 1mM SNP for the indicated time period $(0{\sim}24h)$ . The cyclooxygenase-2 (COX-2) and type II collagen expression levels were determined by immunoblot analysis, and prostaglandin $E_2\;(PGE_2)$ assay was used to measure the COX-2 activity. The tyrosine phosphorylation of caveolin-1 was determined by immunoblot analysis and immunostaining. Results: SNP treatment stimulated tyrosine phosphorylation of caveolin-1 and activation of p38 kinase. SNP additionally caused dedifferentiation and inflammatory response. We showed previously that SNP treatment stimulated activation of p38 kinase and ERK-1/-2. Inhibition of p38 kinase with SB203580 reduced caveolin-1 tyrosine phosphorylation and COX-2 expression but enhanced dedifferentiation, whereas inhibition of ERK with PD98059 did not affect caveolin-1 tyrosine phosphorylation levels, suggesting that ERK at least is not related to dedifferentiation and COX-2 expression through caveolin-1 tyrosine phosphorylation. Conclusion: Our results indicate that SNP in articular chondrocytes stimulates dedifferentiation and inflammatory response via p38 kinase signaling in association with caveolin-1 phosphorylation.


  • 주제어

    SNP .   caveolin-1 .   dedifferentiation .   inflammatory response .   p38 kinase.  

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  • 이 논문을 인용한 문헌 (1)

    1. 2006. "" Immune network : official journal of the Korean association of immunobiologists, 6(4): 204~210     

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