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DDRGK1-mediated ER-phagy attenuates acute kidney injury through ER-stress and apoptosis
Cell Death & Disease ( IF 8.1 ) Pub Date : 2024-01-17 , DOI: 10.1038/s41419-024-06449-4
Haijiao Jin 1 , Yuanting Yang 1 , Xuying Zhu 1 , Yin Zhou 1 , Yao Xu 1 , Jialin Li 1 , Chaojun Qi 1 , Xinghua Shao 1 , Jingkui Wu 2 , Shan Wu 3 , Hong Cai 1 , Leyi Gu 1 , Shan Mou 1 , Zhaohui Ni 1 , Shu Li 1 , Qisheng Lin 1
Affiliation  

AbstractAcute kidney injury (AKI) constitutes a prevalent clinical syndrome characterized by elevated morbidity and mortality rates, emerging as a significant public health issue. This study investigates the interplay between endoplasmic reticulum (ER) stress, unfolded protein response (UPR), and ER-associated degradation (ER-phagy) in the pathogenesis of AKI. We employed four distinct murine models of AKI—induced by contrast media, ischemia–reperfusion injury, cisplatin, and folic acid—to elucidate the relationship between ER-phagy, ER stress, and apoptosis. Our findings reveal a marked decrease in ER-phagy coinciding with an accumulation of damaged ER, elevated ER stress, and increased apoptosis across all AKI models. Importantly, overexpression of DDRGK1 in HK-2 cells enhanced ER-phagy levels, ameliorating contrast-induced ER stress and apoptosis. These findings unveil a novel protective mechanism in AKI, wherein DDRGK1–UFL1-mediated ER-phagy mitigates ER stress and apoptosis in renal tubular epithelial cells. Our results thereby contribute to understanding the molecular underpinnings of AKI and offer potential therapeutic targets for its treatment.

中文翻译:


DDRGK1 介导的 ER 吞噬通过 ER 应激和细胞凋亡减轻急性肾损伤



摘要急性肾损伤(AKI)是一种普遍的临床综合征,其特征是发病率和死亡率升高,已成为一个重要的公共卫生问题。本研究探讨了 AKI 发病机制中内质网 (ER) 应激、未折叠蛋白反应 (UPR) 和 ER 相关降解 (ER-吞噬) 之间的相互作用。我们采用四种不同的 AKI 小鼠模型(由造影剂、缺血再灌注损伤、顺铂和叶酸诱导)来阐明 ER 吞噬、ER 应激和细胞凋亡之间的关系。我们的研究结果表明,在所有 AKI 模型中,ER 吞噬显着减少,同时伴随着受损 ER 的积累、ER 应激升高和细胞凋亡增加。重要的是,HK-2 细胞中 DDRGK1 的过度表达增强了 ER 吞噬水平,改善了造影剂诱导的 ER 应激和细胞凋亡。这些发现揭示了 AKI 中的一种新的保护机制,其中 DDRGK1-UFL1 介导的 ER 吞噬减轻了肾小管上皮细胞的 ER 应激和凋亡。因此,我们的结果有助于了解 AKI 的分子基础,并为其治疗提供潜在的治疗靶点。
更新日期:2024-01-17
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