The flavonoid apigenin downregulates CDK1 by directly targeting ribosomal protein S9.

The flavonoid apigenin downregulates CDK1 by directly targeting ribosomal protein S9.
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DOI:
10.1371/journal.pone.0073219
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发表时间:
2013
期刊:
影响因子:
3.7
通讯作者:
Sakai T
Sakai T
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Iizumi Y;Oishi M;Taniguchi T;Goi W;Sowa Y;Sakai T

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据报道,黄酮类化合物通过引起细胞周期停滞来抑制肿瘤生长。然而,对黄酮类化合物抑制肿瘤生长的直接靶点知之甚少。在本研究中,我们开发了一种新的方法,使用磁性FG珠纯化类黄酮结合蛋白,并确定核糖体蛋白S9(RPS 9)作为类黄酮芹菜素的结合伴侣。与用芹菜素处理类似,RPS 9的敲低通过在启动子水平下调细胞周期蛋白依赖性激酶1(CDK 1)表达来抑制人结肠癌细胞在G2/M期的生长。此外,RPS 9的敲低抑制芹菜素引起的G2/M期阻滞。这些结果表明,芹菜素诱导G2/M期阻滞至少部分通过直接结合和抑制RPS 9,增强CDK 1的表达。因此,我们提出了一种可能性,即确定类黄酮的直接靶点可能有助于发现控制肿瘤生长的新分子机制。
Flavonoids have been reported to inhibit tumor growth by causing cell cycle arrest. However, little is known about the direct targets of flavonoids in tumor growth inhibition. In the present study, we developed a novel method using magnetic FG beads to purify flavonoid-binding proteins, and identified ribosomal protein S9 (RPS9) as a binding partner of the flavonoid apigenin. Similar to treatment with apigenin, knockdown of RPS9 inhibited the growth of human colon cancer cells at the G2/M phase by downregulating cyclin-dependent kinase 1 (CDK1) expression at the promoter level. Furthermore, knockdown of RPS9 suppressed G2/M arrest caused by apigenin. These results suggest that apigenin induces G2/M arrest at least partially by directly binding and inhibiting RPS9 which enhances CDK1 expression. We therefore raise the possibility that identification of the direct targets of flavonoids may contribute to the discovery of novel molecular mechanisms governing tumor growth.
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