SnoN activates p53 directly to regulate aging and tumorigenesis.

SnoN activates p53 directly to regulate aging and tumorigenesis.
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DOI:
10.1111/j.1474-9726.2012.00857.x
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发表时间:
2012-10
期刊:
影响因子:
7.8
通讯作者:
Luo K
Luo K
中科院分区:
生物学1区
文献类型:
--
作者:
Pan D;Zhu Q;Conboy MJ;Conboy IM;Luo K

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我们已确定 SnoN 是 p53 的直接激活剂,可加速衰老并抑制肿瘤发生。先前已证明 SnoN 通过拮抗 TGFβ 信号传导来促进增殖和转化。我们发现,消除 SnoN 体内的 TGFβ 拮抗活性会导致加速衰老和抵抗肿瘤发生。 SnoN 敲入小鼠表现出寿命缩短、繁殖能力下降、骨质疏松、再生能力下降和其他衰老表型,与表达活性 p53 的小鼠中发现的情况类似。 SnoN 的这些活性依赖于 SnoN 激活 p53 的能力。 SnoN 可以直接与 p53 结合,并与 Mdm2 竞争与 p53 的结合,防止 p53 泛素化和降解,并另外促进 p53 乙酰化和磷酸化。 SnoN 还与 p53 响应基因启动子上的 p53 结合,以促进转录激活。 SnoN 对 p53 的激活对于其体内抗肿瘤和早衰活性是必需的,因为消除一个 p53 拷贝可以逆转衰老表型并加速肿瘤发生。因此,我们揭示了 SnoN 通过直接激活 p53 来调节衰老和肿瘤发生的新功能。
We have identified SnoN as a direct activator of p53 to accelerate aging and inhibit tumorigenesis. SnoN has been shown previously to promote proliferation and transformation by antagonizing TGFβ signaling. We show that elimination of this TGFβ antagonistic activity of SnoN in vivo results in accelerated aging and resistance to tumorigenesis. The SnoN knockin mice display a shortened lifespan, decreased reproductivity, osteoporosis, reduced regenerative capacity and other aging phenotypes, similar to that found in mice expressing an active p53. These activities of SnoN rely on the ability of SnoN to activate p53. SnoN can bind directly to p53 and compete with Mdm2 for binding to p53, preventing p53 ubiquitination and degradation and additionally facilitating p53 acetylation and phosphorylation. SnoN also binds to p53 on the promoter of p53 responsive genes to promote transcription activation. This activation of p53 by SnoN is necessary for its anti-tumorigenic and progeria activities in vivo since elimination of one copy of p53 reverses the aging phenotypes and accelerates tumorigenesis. Thus, we have revealed a novel function of SnoN in regulating aging and tumorigenesis by directly activating p53.
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