Ribosome changes reprogram translation for chemosurvival in G0 leukemic cells.

Ribosome changes reprogram translation for chemosurvival in G0 leukemic cells.
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核糖体改变重编程翻译对G0白血病细胞化疗存活的影响。

DOI:
10.1126/sciadv.abo1304
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发表时间:
2022-10-28
期刊:
影响因子:
13.6
通讯作者:
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中科院分区:
综合性期刊1区
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静止的白血病细胞在化疗中存活下来,翻译发生变化。我们的数据显示,FXR1,一种在几种侵袭性癌症中扩增的蛋白,在静止和化疗的白血病细胞中升高,并促进化疗存活。这表明这种RNA和核糖体相关蛋白在化学生存中未被发现的作用。我们发现FXR1缺失减少了翻译,改变了rnas、snoRNAs和核糖体蛋白(RPs)。FXR1调节促进核糖体基因和snorna转录和加工的因子。fxr1过表达细胞的核糖体变化,包括RPLP0/uL10水平,激活eIF2α激酶。因此,磷酸化- eif2 α增加,使fxr1过表达细胞中的生存和免疫调节因子能够选择性翻译。用抑制剂抑制这些基因或磷酸化eif2 α可降低化疗存活率。因此,在静止或化疗的白血病细胞中,FXR1的升高会改变核糖体,从而触发应激信号,重新定向翻译以实现化疗生存。在治疗的AML中,核糖体特性的修饰驱动了存活蛋白的产生,从而促进了AML的存活。
Quiescent leukemic cells survive chemotherapy, with translation changes. Our data reveal that FXR1, a protein amplified in several aggressive cancers, is elevated in quiescent and chemo-treated leukemic cells and promotes chemosurvival. This suggests undiscovered roles for this RNA- and ribosome-associated protein in chemosurvival. We find that FXR1 depletion reduces translation, with altered rRNAs, snoRNAs, and ribosomal proteins (RPs). FXR1 regulates factors that promote transcription and processing of ribosomal genes and snoRNAs. Ribosome changes in FXR1-overexpressing cells, including RPLP0/uL10 levels, activate eIF2α kinases. Accordingly, phospho-eIF2α increases, enabling selective translation of survival and immune regulators in FXR1-overexpressing cells. Overriding these genes or phospho-eIF2α with inhibitors reduces chemosurvival. Thus, elevated FXR1 in quiescent or chemo-treated leukemic cells alters ribosomes that trigger stress signals to redirect translation for chemosurvival. Modification of ribosomal properties in therapy-treated AML drives production of survival proteins and thereby AML survival.
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