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Abstract Title:

Eriodicyol inhibits osteoclast differentiation and ovariectomy-induced bone loss in vivo.

Abstract Source:

Exp Cell Res. 2015 Dec 10 ;339(2):380-8. Epub 2015 Oct 9. PMID: 26450448

Abstract Author(s):

Juhyun Lee, A Long Sae Mi Noh, Ting Zheng, Ju-hee Kang, Mijung Yim

Article Affiliation:

Juhyun Lee

Abstract:

Osteoclasts are responsible for bone erosion in diseases such as osteoporosis and rheumatoid arthritis. In the present study, we investigate the effects of eriodictyol, a flavonoid found naturally in citrus fruits, on the receptor activator of nuclear factor-κB ligand (RANKL)-induced osteoclast formation using mouse bone marrow macrophages (BMMs). Eriodictyol inhibited RANKL-induced osteoclast formation in a dose-dependent manner without cytotoxicity. In addition, eriodictyol suppressed bone resorption activity of differentiated osteoclasts. The inhibitory effect of eriodictyol was associated with impaired activation of multiple signaling events downstream of RANK, including extracellular signal-regulated kinase, p38, and c-Jun terminal kinase phosphorylation, followed by decreased nuclear factor of activated T cells (NFAT)c1 expression. Ectopicoverexpression of a constitutively active form of NFATc1 completely rescued the anti-osteoclastogenic effect of eriodictyol, suggesting that the anti-osteoclastogenic effect was mainly attributed to the reduction in NFATc1 expression. Consistent with the in vitro anti-osteoclastogenic effect, eriodictyol suppressed lipopolysaccharide-induced osteoclast formation in the calvarial model and ovariectomy-induced bone loss in vivo. Taken together, our data demonstrate that eriodictyol is a new therapeutic agent with the potential to prevent bone destructive diseases by reducing both osteoclast differentiation and function.

Study Type : Animal Study

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