Oncogenic viral protein HPV E7 up-regulates the SIRT1 longevity protein in human cervical cancer cells.

Oncogenic viral protein HPV E7 up-regulates the SIRT1 longevity protein in human cervical cancer cells.
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DOI:
10.18632/aging.100028
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发表时间:
2009-03-02
期刊:
Aging
影响因子:
--
通讯作者:
Milner J
Milner J
中科院分区:
其他
文献类型:
--
作者:
Allison SJ;Jiang M;Milner J

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衰老 在感染高危人群的人宫颈角质形成细胞中被阻断 乳头瘤病毒(例如HPV 16型)。病毒癌蛋白HPV E6和HPV E7 通过细胞p53和视网膜母细胞瘤蛋白进入细胞周期 分别以前我们已经表明,HPV E7,而不是HPV E6,也是 负责宫颈癌细胞存活(SiHa细胞; HPV 16型)。我们 现在有证据表明,SIRT 1,一种与衰老相关的NAD依赖性蛋白, SiHa宫颈癌中去乙酰化酶介导HPV E7存活功能 细胞此外,HPV E7上调SIRT 1蛋白表达时, 原代人角质形成细胞。相反,SIRT 1水平在以下情况下降低 SiHa细胞中HPV E7的RNAi介导的沉默。沉默HPV E6没有 对SIRT 1的影响,但正如预期的那样,导致p53蛋白的显著积累 伴随p53介导的p21上调。然而,p53乙酰化 (K382 Ac)几乎检测不到。由于p53是已知的SIRT 1底物, 提出SIRT 1水平升高(由HPV E7诱导)减弱p53, 通过其去乙酰化的促凋亡能力。我们发现HPV E7上调 SIRT 1将临床上重要的致癌病毒与 多功能SIRT 1蛋白。这个链接可能会打开一个更 深入了解HPV诱发恶性肿瘤的过程 转变以及老龄化和 癌
Senescence is blocked in human cervical keratinocytes infected with high risk human papillomavirus (e.g. HPV type16). Viral oncoproteins HPV E6 and HPV E7 access the cell cycle via cellular p53 and retinoblastoma proteins respectively. Previously we have shown that HPV E7, not HPV E6, is also responsible for cervical cancer cell survival (SiHa cells; HPV type16). We now present evidence that SIRT1, an aging-related NAD-dependent deacetylase, mediates HPV E7 survival function in SiHa cervical cancer cells. Moreover, HPV E7 up-regulates SIRT1 protein when expressed in primary human keratinocytes. Conversely, SIRT1 levels decrease following RNAi-mediated silencing of HPV E7 in SiHa cells. Silencing HPV E6 has no effect on SIRT1 but, as expected, causes marked accumulation of p53 protein accompanied by p53-mediated up-regulation of p21. However, p53 acetylation (K382Ac) was barely detectable. Since p53 is a known SIRT1 substrate we propose that elevated SIRT1 levels (induced by HPV E7) attenuate p53 pro-apoptotic capacity via its de-acetylation. Our discovery that HPV E7 up-regulates SIRT1 links a clinically important oncogenic virus with the multi-functional SIRT1 protein. This link may open the way for a more in-depth understanding of the process of HPV-induced malignant transformation and also of the inter-relationships between aging and cancer.
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