AKAP1/PKA 介导的线粒体相关内质网膜上的 GRP75 磷酸化可保护癌细胞免受铁中毒的侵害

IF 13.7 1区 生物学 Q1 BIOCHEMISTRY & MOLECULAR BIOLOGY
Hao Liu, Shanliang Zheng, Guixue Hou, Junren Dai, Yanan Zhao, Fan Yang, Zhiyuan Xiang, Wenxin Zhang, Xingwen Wang, Yafan Gong, Li Li, Ning Zhang, Ying Hu
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引用次数: 0

摘要

新的证据表明,信号通路可以在空间上进行调节,以确保对动态变化的局部线索做出快速有效的反应。铁变性是最近定义的一种脂质过氧化驱动的细胞死亡形式。尽管铁凋亡的分子机制正在形成,但其信号传导的空间方面在很大程度上仍未得到探索。通过分析公共数据库,我们发现线粒体伴侣蛋白--葡萄糖调节蛋白 75(GRP75)--可能在调控铁中毒中发挥着之前未定义的作用。这一发现随后得到了验证。有趣的是,在铁凋亡条件下,GRP75 从线粒体转位到线粒体相关内质网(ER)膜(MAMs)和细胞质。进一步的机理研究揭示了 GRP75 介导的抗铁锈色素沉着信号的高度空间调控。在铁凋亡条件下,脂质过氧化主要积聚在ER,从而以cAMP依赖性方式激活蛋白激酶A(PKA)。特别是,线粒体外膜蛋白A-激酶锚定蛋白1(AKAP1)锚定的PKA信号微域在MAMs中的S148处磷酸化了GRP75。这导致 GRP75 被封闭在线粒体外,在线粒体外,它通过一个保守的高亲和性 RGD 结合基序 ETGE 与 Nrf2 竞争 Keap1 的结合。然后,Nrf2 被稳定和激活,导致一系列抗铁锈色素基因的转录激活。阻断 PKA/GRP75 轴可显著提高癌细胞在体内和体外对铁变态反应的反应。我们发现了一个参与保护癌细胞免受铁变态反应的局部信号级联,这拓宽了我们对细胞防御铁变态反应机制的理解,同时也提供了一个新的靶轴(AKAP1/PKA/GRP75)来改善癌细胞对铁变态反应的反应。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

AKAP1/PKA-mediated GRP75 phosphorylation at mitochondria-associated endoplasmic reticulum membranes protects cancer cells against ferroptosis

AKAP1/PKA-mediated GRP75 phosphorylation at mitochondria-associated endoplasmic reticulum membranes protects cancer cells against ferroptosis

Emerging evidence suggests that signaling pathways can be spatially regulated to ensure rapid and efficient responses to dynamically changing local cues. Ferroptosis is a recently defined form of lipid peroxidation-driven cell death. Although the molecular mechanisms underlying ferroptosis are emerging, spatial aspects of its signaling remain largely unexplored. By analyzing a public database, we found that a mitochondrial chaperone protein, glucose-regulated protein 75 (GRP75), may have a previously undefined role in regulating ferroptosis. This was subsequently validated. Interestingly, under ferroptotic conditions, GRP75 translocated from mitochondria to mitochondria-associated endoplasmic reticulum (ER) membranes (MAMs) and the cytosol. Further mechanistic studies revealed a highly spatial regulation of GRP75-mediated antiferroptotic signaling. Under ferroptotic conditions, lipid peroxidation predominantly accumulated at the ER, which activated protein kinase A (PKA) in a cAMP-dependent manner. In particular, a signaling microdomain, the outer mitochondrial membrane protein A-kinase anchor protein 1 (AKAP1)-anchored PKA, phosphorylated GRP75 at S148 in MAMs. This caused GRP75 to be sequestered outside the mitochondria, where it competed with Nrf2 for Keap1 binding through a conserved high-affinity RGD-binding motif, ETGE. Nrf2 was then stabilized and activated, leading to the transcriptional activation of a panel of antiferroptotic genes. Blockade of the PKA/GRP75 axis dramatically increased the responses of cancer cells to ferroptosis both in vivo and in vitro. Our identification a localized signaling cascade involved in protecting cancer cells from ferroptosis broadens our understanding of cellular defense mechanisms against ferroptosis and also provides a new target axis (AKAP1/PKA/GRP75) to improve the responses of cancer cells to ferroptosis.

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来源期刊
Cell Death and Differentiation
Cell Death and Differentiation 生物-生化与分子生物学
CiteScore
24.70
自引率
1.60%
发文量
181
审稿时长
3 months
期刊介绍: Mission, vision and values of Cell Death & Differentiation: To devote itself to scientific excellence in the field of cell biology, molecular biology, and biochemistry of cell death and disease. To provide a unified forum for scientists and clinical researchers It is committed to the rapid publication of high quality original papers relating to these subjects, together with topical, usually solicited, reviews, meeting reports, editorial correspondence and occasional commentaries on controversial and scientifically informative issues.
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