HDAC inhibitor trichostatin A suppresses osteoclastogenesis by upregulating the expression of C/EBP-β and MKP-1.

HDAC inhibitor trichostatin A suppresses osteoclastogenesis by upregulating the expression of C/EBP-β and MKP-1.
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DOI:
10.1111/j.1749-6632.2011.06286.x
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发表时间:
2011-12
影响因子:
5.2
通讯作者:
Rahman MM
Rahman MM
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Williams PJ;Nishu K;Rahman MM

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组蛋白脱乙酰酶 (HDAC) 去除组蛋白尾部赖氨酸残基上的乙酰基,从而形成浓缩且转录沉默的染色质。 HDAC 抑制剂 (HDACi) 阻断这种作用,并可能导致组蛋白过度乙酰化,从而导致染色质结构不那么紧凑且转录活性更高,从而导致基因表达。之前,我们已经证明 HDACi 抑制破骨细胞分化。然而,哪些基因在组蛋白过度乙酰化后被转录激活,并导致破骨细胞生成受到抑制,尚未阐明。在这项研究中,我们发现 HDACi 曲古抑菌素 A (TSA) 可抑制核因子 κB 受体激活剂 (NF-κB) 配体 (RANKL) 刺激的 TNF-α 产生、NF-κB 激活和骨吸收坑形成,并下调 RAW264.7 细胞中的 cFos 和 NFATc1。有趣的是,在 TSA 处理的 RANKL 刺激的 RAW264.7 细胞中,抗​​破骨细胞因子 CCAAT 增强子结合蛋白 (C/EBP)-β 和丝裂原激活蛋白激酶磷酸酶 (MKP)-1 的表达显着上调。这些发现表明,TSA 上调 C/EBP-β 和 MKP-1 的表达,从而可能下调促破骨细胞因子和信号分子,最终抑制破骨细胞生成。
Histone deacetylases (HDACs) remove the acetyl groups from the lysine residues of histone tails, leading to the formation of a condensed and transcriptionally silenced chromatin. HDAC inhibitors (HDACi) block this action and can result in hyperacetylation of histones, leading to a less compact and more transcriptionally active chromatin and thereby, gene expression. Previously, we have shown that HDACi inhibit osteoclast differentiation. However, which genes are transcriptionally activated following hyperacetylation of histones, and lead to the suppression of osteoclastogenesis, has yet to be elucidated. In this study, we show that a HDACi, trichostatin A (TSA), inhibits receptor activator of nuclear factor-κB (NF-κB) ligand (RANKL) stimulated TNF-α production, NF-κB activation and bone resorbing pit formation and down-regulates cFos and NFATc1 in RAW264.7 cells. Interestingly, anti-osteoclastogenic factors CCAAT enhancer binding protein (C/EBP)-β and mitogen activated protein kinase phosphatase (MKP)-1 expression were significantly up-regulated in TSA-treated RANKL-stimulated RAW264.7 cells. These findings suggest that TSA up-regulates the expression of C/EBP-β and MKP-1 which may down-regulate pro-osteoclastogenic factors and signaling molecules, ultimately suppressing osteoclastogenesis.
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