Abstract

Objective Increased expression of inducible NO synthase (iNOS) and cyclooxygenase (COX)-2 plays a key role in the pathogenesis of osteoarthritis (OA) disease. Methylation of lysine 4 on histone H3 (H3K4) was shown to be of fundamental importance in the regulation of gene expression. In the present study, we investigated the role of H3K4 methylation in interleukin-1b (IL-1)induced COX-2 and iNOS expression in human OA chondrocytes.

Highlights

  • Interleukin-1-induced cyclooxygenase-2 and inducible nitric oxide synthase expression in human OA chondrocytes is associated with histone H3K4 methylation

  • We investigated the role of H3K4 methylation in interleukin-1b (IL-1)induced COX-2 and inducible NO synthase (iNOS) expression in human OA chondrocytes

  • Chondrocytes were stimulated with IL-1 for various time periods and the expression of iNOS and COX-2 mRNAs and proteins were evaluated using real-time reverse transcriptase-polymerase chain reaction (RT-PCR) and Western blotting, respectively

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Summary

Objective

Increased expression of inducible NO synthase (iNOS) and cyclooxygenase (COX)-2 plays a key role in the pathogenesis of osteoarthritis (OA) disease. Methylation of lysine 4 on histone H3 (H3K4) was shown to be of fundamental importance in the regulation of gene expression. We investigated the role of H3K4 methylation in interleukin-1b (IL-1)induced COX-2 and iNOS expression in human OA chondrocytes

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