FicD regulates adaptation to the unfolded protein response in the murine liver

IF 3.3 3区 生物学 Q2 BIOCHEMISTRY & MOLECULAR BIOLOGY
Amanda K. Casey , Nathan M. Stewart , Naqi Zaidi , Hillery F. Gray , Amelia Cox , Hazel A. Fields , Kim Orth
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Abstract

The unfolded protein response (UPR) is a cellular stress response that is activated when misfolded proteins accumulate in the endoplasmic reticulum (ER). Regulation of the UPR response must be adapted to the needs of the cell as prolonged UPR responses can result in disrupted cellular function and tissue damage. Previously, we discovered that the enzyme FicD (also known as Fic or HYPE) through its AMPylation and deAMPylation activity can modulate the UPR response via post-translational modification of BiP. FicD AMPylates BiP during homeostasis and deAMPylates BiP during stress. We hypothesized that FicD regulation of the UPR will play a role in mitigating the deleterious effects of UPR activation in tissues with frequent physiological stress. Here, we explore the role of FicD in the murine liver. As seen in our pancreatic studies, livers lacking FicD exhibit enhanced UPR signaling in response to short term physiologic fasting and feeding stress. However, in contrast to studies on the pancreas, livers, as a more regenerative tissue, remained remarkably resilient in the absence of FicD. The livers of FicD−/− did not show marked changes in UPR signaling or damage after either chronic high fat diet (HFD) feeding or acute pathological UPR induction. Intriguingly, FicD−/− mice showed changes in UPR induction and weight loss patterns following repeated pathological UPR induction. These findings indicate that FicD regulates UPR responses during mild physiological stress and in adaptation to repeated stresses, but there are tissue specific differences in the requirement for FicD regulation.

FicD调节小鼠肝脏对未折叠蛋白反应的适应。
未折叠蛋白质反应(UPR)是一种细胞应激反应,当错误折叠的蛋白质在内质网(ER)中积累时就会被激活。对 UPR 反应的调节必须适应细胞的需要,因为长时间的 UPR 反应会导致细胞功能紊乱和组织损伤。在此之前,我们发现 FicD 酶(又称 Fic 或 HYPE)通过其 AMPylation 和 deAMPylation 活性可以通过对 BiP 的翻译后修饰来调节 UPR 反应。FicD 在平衡状态下 AMPylates BiP,而在应激状态下 deAMPylates BiP。我们假设 FicD 对 UPR 的调控将在减轻 UPR 激活对频繁生理应激组织的有害影响方面发挥作用。在这里,我们探讨了 FicD 在小鼠肝脏中的作用。正如我们在胰腺研究中看到的那样,缺乏 FicD 的肝脏在应对短期生理禁食和进食应激时表现出增强的 UPR 信号传导。然而,与胰腺研究不同的是,肝脏作为一种再生能力更强的组织,在缺乏 FicD 的情况下仍然具有显著的恢复能力。FicD-/- 的肝脏在长期高脂饮食(HFD)喂养或急性病理 UPR 诱导后,UPR 信号转导或损伤均未出现明显变化。耐人寻味的是,FicD-/-小鼠在反复病理UPR诱导后,UPR诱导和体重减轻模式发生了变化。这些研究结果表明,在轻度生理应激和适应重复应激时,FicD调节UPR反应,但对FicD调节的要求存在组织特异性差异。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Biochimie
Biochimie 生物-生化与分子生物学
CiteScore
7.20
自引率
2.60%
发文量
219
审稿时长
40 days
期刊介绍: Biochimie publishes original research articles, short communications, review articles, graphical reviews, mini-reviews, and hypotheses in the broad areas of biology, including biochemistry, enzymology, molecular and cell biology, metabolic regulation, genetics, immunology, microbiology, structural biology, genomics, proteomics, and molecular mechanisms of disease. Biochimie publishes exclusively in English. Articles are subject to peer review, and must satisfy the requirements of originality, high scientific integrity and general interest to a broad range of readers. Submissions that are judged to be of sound scientific and technical quality but do not fully satisfy the requirements for publication in Biochimie may benefit from a transfer service to a more suitable journal within the same subject area.
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