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Herba epimedii flavonoids suppress osteoclastic differentiation and bone resorption by inducing G2/M arrest and apoptosis.

Abstract：

:Accumulating evidences suggest that Herba epimedii has the potential benefits against osteoporosis. However, previous studies were focused on the crude extract, total flavonoids (TF) and icariin (ICA), and the detailed molecular mechanisms of action and structure-activity relationship (SAR) remain unclear. Herein we aimed to systematically investigate the effects of Herba epimedii flavonoids (HEF) on the activity of osteoclasts, and explore the potential SAR. Both ICA and baohuoside-1 (BS) significantly inhibited the proliferation of RAW 264.7 cells (IC(50) 25 μM and 67 μM, respectively). Treatment of ICA resulted in G2/M arrest and apoptosis in RAW 264.7 cells as early as 12 h. Besides, HEF remarkably suppressed vitamin D-induced differentiation of osteoclasts in rabbit bone marrow cells and the bone resorption of rabbit mature osteoclasts in vitro. It is notable that the inhibitory effect of 100 μM ICA and BS on osteoclast formation is almost 90%; and the inhibition rate on bone resorption is 50% and 80%, respectively. Besides, RANKL-induced osteoclast formation from RAW 264.7 cells and the expression of TRAP, CA II, CTSK and MMP-9 was significantly reduced by the treatment of 25 μM HEF and 17β-estradiol (ES), and the inhibitory strength increases in the order TF < ES < ICA < BS, which was blocked by ICI182780 suggesting that the regulation of osteoclast activity might be ER dependent. Furthermore, the free hydroxyl group at C-7 of BS played an important role in the SAR for anti-osteoclast action. To conclude, HEF could regulate the formation and activity of osteoclasts by inhibiting the proliferation and differentiation, inducing apoptosis and cell cycle arrest and suppressing bone resorption of osteoclasts. Changes in osteoclast activity are probably mediated predominantly by interaction with nuclear estrogen receptors and via mitochondrial pathway. HEF, especially BS, has great potential for the prevention and treatment of osteoporosis.

journal_name

Biochimie

journal_title

Biochimie

authors

Zhang D,Zhang J,Fong C,Yao X,Yang M

doi

10.1016/j.biochi.2012.06.033

subject

Has Abstract

pub_date

2012-12-01 00:00:00

pages

2514-22

issue

12

eissn

0300-9084

issn

1638-6183

pii

S0300-9084(12)00268-4

journal_volume

94

pub_type

杂志文章

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