Stem cell function and stress response are controlled by protein synthesis.

Stem cell function and stress response are controlled by protein synthesis.
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干细胞的功能和应激反应是由蛋白质合成控制的。

DOI:
10.1038/nature18282
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发表时间:
2016-06-16
期刊:
影响因子:
64.8
通讯作者:
Frye, Michaela
Frye, Michaela
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Blanco, Sandra;Bandiera, Roberto;Popis, Martyna;Hussain, Shobbir;Lombard, Patrick;Aleksic, Jelena;Sajini, Abdulrahim;Tanna, Hinal;Cortes-Garrido, Rosana;Gkatza, Nikoletta;Dietmann, Sabine;Frye, Michaela

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蛋白质合成和细胞应激反应途径是否与控制干细胞功能相互作用尚不清楚。在这里,我们表明,即使被迫增殖,皮肤干细胞的合成蛋白质的蛋白质比其直接的祖细胞少。我们的分析表明,应力反应途径的激活既驱动蛋白质合成的全球降低,又可以改变转化程序,共同促进干细胞功能和肿瘤发生。从机械上讲,我们表明,在这个独特的翻译抑制计划中,对转录后胞质-5甲基化的抑制会锁定干细胞。矛盾的是,这种抑制作用使干细胞对细胞毒性应激过敏,因为用5-氟尿嘧啶处理后的肿瘤再生被阻断。因此,干细胞必须撤销翻译抑制途径以再生组织或肿瘤。
Whether protein synthesis and cellular stress response pathways interact to control stem cell function is currently unknown. Here, we show that skin stem cells synthesize less protein than their immediate progenitors in vivo, even when forced to proliferate. Our analyses reveal that activation of stress response pathways drives both a global reduction of protein synthesis and altered translational programmes that together promote stem cell functions and tumourigenesis. Mechanistically we show that inhibition of post-transcriptional cytosine-5 methylation locks stem cells in this distinct translational inhibition programme. Paradoxically, this inhibition renders stem cells hypersensitive to cytotoxic stress, as tumour regeneration after treatment with 5-fluorouracil is blocked. Thus, stem cells must revoke translation inhibition pathways to regenerate a tissue or tumour.
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