Reflux of Endoplasmic Reticulum proteins to the cytosol yields inactivation of tumor suppressors

Reflux of Endoplasmic Reticulum proteins to the cytosol yields inactivation of tumor suppressors
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内质网蛋白回流至细胞质导致肿瘤抑制因子失活

DOI:
10.1101/2020.04.13.038935
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发表时间:
2020
期刊:
--
影响因子:
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通讯作者:
Sicari D
Sicari D
中科院分区:
--
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作者:
Sicari D

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在过去的几十年里,许多研究报道内质网(ER)驻留蛋白定位于胞浆,但其发生机制以及这些蛋白是否发挥胞浆功能尚不清楚。我们发现,从小鼠和人类肿瘤中分离的胶质母细胞瘤细胞胞浆中有选择性内质网腔蛋白的积累。在培养的细胞中,ER蛋白在蛋白稳定扰动时回流到胞浆中。因此,我们研究了回流蛋白是否在胞浆中获得了新的功能,从而为肿瘤细胞提供了有利条件。以ER腔蛋白AGR2为模型,我们发现它被回流到胞浆,在那里它结合并抑制肿瘤抑制因子P53。我们将这种现象命名为ER到胞浆信号转导(ERCyS),这是一种在真核生物中保守的ER监测机制,目的是在应激时解除ER的含量,并通过获得胞浆功能为肿瘤细胞提供选择性优势。
In the past decades many studies reported Endoplasmic Reticulum (ER) resident proteins to localize to the cytosol but the mechanisms by which this occurs and whether these proteins exert cytosolic functions remain unknown. We found that select ER luminal proteins accumulate in the cytosol of glioblastoma cells isolated from mouse and human tumors. In cultured cells ER protein reflux to the cytosol occurs upon proteostasis perturbation. As such we investigated whether refluxed proteins gain new functions in the cytosol thus providing advantage to tumor cells. Using the ER luminal protein AGR2 as a model, we showed that it is refluxed to the cytosol where it binds and inhibits the tumor suppressor p53. We named this phenomenon ER to Cytosol Signaling (ERCYS) as an ER surveillance mechanism conserved in Eukaryotes to relieve the ER from its contents upon stress and to provide selective advantage to tumor cells through gain-of-cytosolic functions.
DOI: 10.1126/scisignal.aan0630
发表时间: 2018-01-02
期刊: SCIENCE SIGNALING
影响因子: 7.3
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