WRAP53 promotes cancer cell survival and is a potential target for cancer therapy.

WRAP53 promotes cancer cell survival and is a potential target for cancer therapy.
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DOI:
10.1038/cddis.2010.90
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发表时间:
2011-01-13
影响因子:
9
通讯作者:
--
中科院分区:
生物学1区
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我们之前将 WRAP53 鉴定为调节 p53 肿瘤抑制因子的反义转录物。 WRAP53基因还编码卡哈尔体形成所必需的蛋白质,并参与运动神经元复合体、端粒酶和小卡哈尔体特异性RNA向卡哈尔体的存活的细胞运输。在这里,我们发现 WRAP53 蛋白在多种不同来源的癌细胞系中过度表达,并且 WRAP53 过度表达促进细胞转化。 Bax/Bak 激活、线粒体膜电位丧失和细胞色素 c 释放表明,WRAP53 蛋白的敲低会通过线粒体途径引发大量细胞凋亡。此外,Bcl-2 过表达还可阻断 WRAP53 敲低诱导的细胞凋亡。有趣的是,与正常人类细胞相比,人类肿瘤细胞对 WRAP53 的缺失更敏感,这表明癌细胞的生存尤其依赖于 WRAP53 的表达。与此一致的是,我们发现高水平的 WRAP53 与头颈癌的不良预后相关。这些观察结果共同提出了 WRAP53 在致癌作用中的作用,并将 WRAP53 确定为大部分恶性肿瘤的新分子靶点。
We previously identified WRAP53 as an antisense transcript that regulates the p53 tumor suppressor. The WRAP53 gene also encodes a protein essential for Cajal body formation and involved in cellular trafficking of the survival of motor neuron complex, the telomerase enzyme and small Cajal body-specific RNAs to Cajal bodies. Here, we show that the WRAP53 protein is overexpressed in a variety of cancer cell lines of different origin and that WRAP53 overexpression promotes cellular transformation. Knockdown of the WRAP53 protein triggers massive apoptosis through the mitochondrial pathway, as demonstrated by Bax/Bak activation, loss of mitochondrial membrane potential and cytochrome c release. The apoptosis induced by WRAP53 knockdown could moreover be blocked by Bcl-2 overexpression. Interestingly, human tumor cells are more sensitive to WRAP53 depletion as compared with normal human cells indicating that cancer cells in particular depends on WRAP53 expression for their survival. In agreement with this, we found that high levels of WRAP53 correlate with poor prognosis of head and neck cancer. Together these observations propose a role of WRAP53 in carcinogenesis and identify WRAP53 as a novel molecular target for a large fraction of malignancies.
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