The La protein counteracts cisplatin-induced cell death by stimulating protein synthesis of anti-apoptotic factor Bcl2.

The La protein counteracts cisplatin-induced cell death by stimulating protein synthesis of anti-apoptotic factor Bcl2.
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DOI:
10.18632/oncotarget.8819
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发表时间:
2016-05-17
期刊:
影响因子:
--
通讯作者:
Sommer G
Sommer G
中科院分区:
其他
文献类型:
--
作者:
Heise T;Kota V;Brock A;Morris AB;Rodriguez RM;Zierk AW;Howe PH;Sommer G

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抗凋亡因子的上调是肿瘤细胞耐药的重要机制,常常影响化疗的成功。在这里,我们确定癌症相关的RNA结合蛋白La是导致顺铂耐药的新因素。我们的数据表明,头颈部鳞状细胞癌细胞(HNSCC)中RNA结合蛋白La的缺失增加了对顺铂诱导的细胞死亡的敏感性,这与抗凋亡因子Bcl2的表达减少是平行的。此外,研究表明,在La缺乏的细胞中瞬时表达Bcl2可以保护顺铂诱导的细胞死亡。通过剖析我们在这里报告的潜在机制,在顺铂处理的细胞中,La蛋白是合成Bcl2蛋白所必需的。RNA伴侣La在靠近正宗翻译起始点的地方结合,并解开嵌入正宗8月的二级结构。总之,我们的数据支持一个新的模型,在这个模型中,癌症相关的La蛋白通过刺激HNSCC细胞中抗凋亡因子Bcl2的翻译来促进顺铂耐药。
Up-regulation of anti-apoptotic factors is a critical mechanism of cancer cell resistance and often counteracts the success of chemotherapeutic treatment. Herein, we identified the cancer-associated RNA-binding protein La as novel factor contributing to cisplatin resistance. Our data demonstrate that depletion of the RNA-binding protein La in head and neck squamous cell carcinoma cells (HNSCC) increases the sensitivity toward cisplatin-induced cell death paralleled by reduced expression of the anti-apoptotic factor Bcl2. Furthermore, it is shown that transient expression of Bcl2 in La-depleted cells protects against cisplatin-induced cell death. By dissecting the underlying mechanism we report herein, that the La protein is required for Bcl2 protein synthesis in cisplatin-treated cells. The RNA chaperone La binds in close proximity to the authentic translation start site and unwinds a secondary structure embedding the authentic AUG. Altogether, our data support a novel model, whereby cancer-associated La protein contributes to cisplatin resistance by stimulating the translation of anti-apoptotic factor Bcl2 in HNSCC cells.
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