Bee venom attenuates <i>Porphyromonas gingivalis</i> and RANKL-induced bone resorption with osteoclastogenic differentiation

다국어 초록 (Multilingual Abstract)

<P><B>Abstract</B></P> <P> <I>Porphyromonas gingivalis</I> (<I>P. gingivalis</I>) is one of the major periodontal pathogens leading to inflammation and alveolar bone resorption. Bone resorption is induced by osteoclasts, which are multinucleated giant cells. Osteoclastic bone resorption is mediated by enhanced receptor activator of nuclear factor-kappa B ligand (RANKL) signaling. Therefore, the down-regulation of RANKL downstream signals is regarded as an effective therapeutic target in the treatment of bone loss-associated disorders. The aim of this study was to evaluate whether purified bee venom (BV) could attenuate <I>P. gingivalis</I>-induced inflammatory periodontitis and RANKL-induced osteoclast differentiation. Inflammatory periodontitis induced by <I>P. gingivalis</I> increased alveolar bone resorption and increased expression of TNF-α and IL-1β, while BV treatment resulted in decreased bone loss and pro-inflammatory cytokines. Similarly, RANKL-induced multinucleated osteoclast differentiation and osteoclast-specific gene expression, such as nuclear factor of activated T cells 1 (NFATc1), cathepsin K, tartrate-resistant acid phosphatase (TRAP), and integrin αvβ3 were significantly suppressed by treatment with BV. We show that BV reduces <I>P. gingivalis</I>-induced inflammatory bone loss-related periodontitis <I>in vivo</I> and RANKL-induced osteoclast differentiation, activation, and function <I>in vitro</I>. These results suggest that BV exerts positive effects on inflammatory periodontitis associated osteoclastogenesis.</P> <P><B>Highlights</B></P> <P> <UL> <LI> BV diminished osteoclast differentiation and function. </LI> <LI> BV blocked the MAPKs signaling pathway. </LI> <LI> BV ameliorated bone resorption associated with periodontitis. </LI> </UL> </P>