DNA damage triggers tubular endoplasmic reticulum extension to promote apoptosis by facilitating ER-mitochondria signaling.

DNA damage triggers tubular endoplasmic reticulum extension to promote apoptosis by facilitating ER-mitochondria signaling.
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DNA损伤触发管状内质网延伸,通过促进ER-线粒体信号传导促进细胞凋亡

DOI:
10.1038/s41422-018-0065-z
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发表时间:
2018-08
期刊:
影响因子:
44.1
通讯作者:
Chen J
Chen J
中科院分区:
生物学1区
文献类型:
--
作者:
Zheng P;Chen Q;Tian X;Qian N;Chai P;Liu B;Hu J;Blackstone C;Zhu D;Teng J;Chen J

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内质网(ER)由核膜、核周片和周围管状网组成。外周ER和线粒体在特定的亚结构域形成紧密接触,其协调两个细胞器的功能,并且是多个细胞过程如Ca 2+转移和凋亡所需的。然而,在不同的生理或病理条件下,如DNA损伤,ER形态和ER-线粒体信号传导如何动态调节,在很大程度上是未知的。在这里,我们表明,外周,管状ER经历显着的扩展响应DNA损伤,这一过程是依赖于p53介导的ER形成蛋白REEP 1,REEP 2和EI 24(别名PIG 8)的转录激活。这通过EI 24和线粒体外膜蛋白VDAC 2促进ER-线粒体接触的形成,促进Ca 2+从ER向线粒体的转移,并促进DNA损伤诱导的细胞凋亡。因此,我们确定了一个独特的DNA损伤反应途径,涉及ER形态,ER-线粒体信号转导和细胞凋亡的改变。
The endoplasmic reticulum (ER) is composed of the nuclear envelope, perinuclear sheets and a peripheral tubular network. The peripheral ER and mitochondria form tight contacts at specific subdomains, which coordinate the functions of the two organelles and are required for multiple cellular processes such as Ca2+transfer and apoptosis. However, it is largely unknown how ER morphology and ER-mitochondria signaling are dynamically regulated under different physiological or pathological conditions such as DNA damage. Here we show that the peripheral, tubular ER undergoes significant extension in response to DNA damage, and that this process is dependent on p53-mediated transcriptional activation of the ER-shaping proteins REEP1, REEP2 and EI24 (alias PIG8). This promotes the formation of ER-mitochondria contacts through EI24 and the mitochondrial outer membrane protein VDAC2, facilitates Ca2+transfer from ER to mitochondria and promotes DNA damage-induced apoptosis. Thus, we identify a unique DNA damage response pathway involving alterations in ER morphology, ER-mitochondria signaling, and apoptosis.
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