Add time:09/24/2019         Source:sciencedirect.com

We have isolated 9-methylstreptimidone from microorganism as a new NF-κB inhibitor. Later, we designed 3-[(dodecylthiocarbonyl) methyl]-glutarimide (DTCM-glutarimide) as an analog of this compound, which shows anti-inflammatory activity in vivo. In the present research, we found that DTCM-glutarimide inhibited receptor activator of nuclear factor-κB ligand (RANKL)-induced osteoclast differentiation of mouse bone marrow-derived macrophages and RANKL- or lipopolysaccharide (LPS)-induced osteoclast differentiation of RAW 264.7 cells without any toxicity. It also inhibited the RANKL-induced NFATc1 expression. Upstream signaling involving phosphorylation of Akt and GSK-3β was induced by RANKL, of which the signaling was inhibited by DTCM-glutarimide. Then DTCM-glutarimide was confirmed to inhibit RANKL-induced NF-κB activity, possibly by inhibiting the Akt-mediated activation of IKK. Thus, DTCM-glutarimide inhibited osteoclastogenesis by blocking both the Akt-GSK3β-NFATc1 and NF-κB-NFATc1 pathways. DTCM-glutarimide may be a candidate as a chemotherapeutic agent for severe bone resorption diseases.

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