The inhibitory effect and the molecular mechanism of glabridin on RANKL-induced osteoclastogenesis in RAW264.7 cells.

Abstract:

:Osteoblastic bone formation and osteoclastic bone resorption are in balance to maintain a constant, homeostatically controlled amount of bone. Excessive bone resorption by osteoclasts is involved in the pathogenesis of bone-related disorders. In the present study, we evaluated the inhibitory effects of glabridin, a flavonoid purified from licorice root, on the receptor activator of nuclear factor-κB ligand (RANKL)-induced osteoclast differentiation and its molecular mechanisms in murine osteoclast progenitor RAW264.7 cells. Glabridin significantly inhibited RANKL-induced tartrate-resistant acid phosphatase (TRAP) activity, the formation of multinucleated osteoclasts and resorption-pit formation. In mechanistic studies of the anti-osteoclastogenic potential of glabridin, we found that glabridin inhibited RANKL-induced expression of c-Fos and subsequent expression of NFATc1, which is a master regulator of osteoclastogenesis. Interestingly, glabridin inhibited the RANKL-induced expression of signaling molecules (TRAF6, GAB2, ERK2, JNK1 and MKK7) and osteoclast survival-related signaling pathways such as c-Src, PI3K and Akt2. Glabridin also inhibited the bone resorptive activity of mature osteoclasts by inhibiting osteoclast-associated genes (cathepsin K, MMP-9, CAII, TCIRG1, OSTM1 and CLCN7). Taken together, our data suggest that glabridin holds great promise for use in preventing osteoclastogenesis by inhibiting RANKL-induced activation of signaling molecules and subsequent transcription factors in osteoclast precursors and these findings may be useful for evaluating treatment options in bone-destructive diseases.

journal_name

Int J Mol Med

authors

Kim HS,Suh KS,Sul D,Kim BJ,Lee SK,Jung WW

doi

10.3892/ijmm.2011.822

subject

Has Abstract

pub_date

2012-02-01 00:00:00

pages

169-77

issue

2

eissn

1107-3756

issn

1791-244X

journal_volume

29

pub_type

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