Diclofenac Sodium Inhibits NFκB Transcription in Osteoclasts

Abstract

A non-steroidal anti-inflammatory drug, diclofenac, acts efficiently against inflammation; however, down-regulation of diclofenac on bone remodeling has raised concerns. The inhibitory mechanisms of diclofenac are poorly understood. We hypothesized that diclofenac down-regulates osteoclast differentiation and activation via inhibition of the translocation of phosphorylated nuclear factor kappa B (NFκB). When osteoclasts prepared from mouse hematopoietic stem cells were treated with diclofenac, tartrateresistant acid phosphatase-positive multinucleated cells decreased in a concentration-dependent manner. Pit formation assay revealed the abolition of osteoclastic bone resorption; levels of cathepsin K transcripts, an osteoclastic resorption marker, were down-regulated time-dependently. Diclofenac induced the accumulation of the inhibitor of kappa B in cytosol, which led to suppression of the nuclear translocation of NFκB and phosphorylated NFκB. These results suggest that the novel mechanism of diclofenac for bone remodeling is associated with phosphorylated NFκB reduction, which regulates osteoclast differentiation and activation.

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