Nucleostemin: Another nucleolar "Twister" of the p53-MDM2 loop.

Nucleostemin: Another nucleolar "Twister" of the p53-MDM2 loop.
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DOI:
10.4161/cc.9.16.12605
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发表时间:
2010-08-15
期刊:
Cell cycle (Georgetown, Tex.)
影响因子:
--
通讯作者:
Lu H
Lu H
中科院分区:
其他
文献类型:
--
作者:
Lo D;Lu H

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一些核核体蛋白,如ARF,核糖体蛋白(RP) L5, L11, L23和S7,已被证明通过抑制MDM2 E3连接酶活性诱导p53活化,从而引发细胞周期阻滞和/或凋亡。我们最近的研究揭示了另一种名为核干蛋白(NS)的核仁蛋白,一种核仁GTP结合蛋白,作为p53-MDM2反馈回路的新调节剂。然而,与其他已知的该环的核仁调节因子不同,NS令人惊讶地发挥着双重作用,因为其水平的上下调节都可以开启p53的活性。在此,我们试图通过对该领域先前和最近发表的研究进行梳理,对这一不寻常的现象提供一些前瞻性的观点,希望更好地描述NS在细胞生长和增殖过程中将p53通路与核糖体生物发生联系起来的作用,并提出NS作为抗癌药物开发的另一个潜在分子靶点。
Several nucleolar proteins, such as ARF, ribosomal protein (RP) L5, L11, L23 and S7, have been shown to induce p53 activation by inhibiting MDM2 E3 ligase activity and consequently to trigger cell cycle arrest and/or apoptosis. Our recent study revealed another nucleolar protein called nucleostemin (NS), a nucleolar GTP binding protein, as a novel regulator of the p53-MDM2 feedback loop. However, unlike other known nucleolar regulators of this loop, NS surprisingly plays a dual role, as both up and down regulations of its levels could turn on p53 activity. Here, we try to offer some prospective views for this unusual phenomenon by reconciling previously and recently published studies in the field in hoping to better depict the role of NS in linking the p53 pathway with ribosomal biogenesis during cell growth and proliferation as well as to propose NS as another potential molecular target for anti-cancer drug development.
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