SIGMAR1/Sigma-1 受体:稳定和翻译 LC3B mRNA 以促进自噬体形成的关键调控因子

Yu-Jie Chen, Jeffrey Knupp, Emily Wang, Peter Arvan, Billy Tsai
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摘要

大自噬/自噬通过溶酶体降解和回收细胞成分,以维持细胞的平衡。我们的研究发现,内质网(ER)驻留的 SIGMAR1(sigma 非阿片类细胞内受体 1)是 Atg8 家族蛋白生物合成的关键调控因子,它导致自噬体形成过程中必不可少的脂质化。我们证明 SIGMAR1 能稳定 MAP1LC3B/LC3B 和 GABARAP mRNA,促进它们在 ER 近端进行定位翻译,从而实现高效脂化。利用单分子荧光原位杂交/smFISH 和共免疫沉淀技术,我们发现 SIGMAR1 直接与 LC3B mRNA 的 3' UTR 中的保守区结合,促进其翻译、高效脂化和正确整合到吞噬膜中。缺乏 SIGMAR1 的细胞显示许多 Atg8 家族蛋白水平降低,自噬通量受损。我们的模型表明,SIGMAR1 介导的 Atg8 家族蛋白在 ER 的定位翻译促进了自噬体的有效形成,而不是将预先存在的细胞质 Atg8 家族蛋白招募到脂化机制中。阐明 SIGMAR1 在自噬中的作用可能会为预防或治疗依赖自噬的神经退行性疾病提供更好的治疗策略,特别是考虑到 SIGMAR1 的高度可药性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
SIGMAR1/Sigma-1 receptor: a key regulator in stabilizing and translating LC3B mRNA for autophagosome formation.

Macroautophagy/autophagy degrades and recycles cellular constituents via the lysosome to maintain cellular homeostasis. Our study identified the endoplasmic reticulum (ER)-resident SIGMAR1 (sigma non-opioid intracellular receptor 1) as a critical regulator of the biosynthesis of Atg8-family proteins that leads to the lipidation that is essential during autophagosome formation. We demonstrate that SIGMAR1 stabilizes MAP1LC3B/LC3B and GABARAP mRNAs, promoting their localized translation proximal to the ER for efficient lipidation. Using single-molecule fluorescence in situ hybridization/smFISH and co-immunoprecipitation, we found that SIGMAR1 directly binds to a conserved region in the 3' UTR of LC3B mRNA, facilitating its translation, efficient lipidation, and proper integration into the phagophore membrane. Cells lacking SIGMAR1 show reduced levels of many Atg8-family proteins and impaired autophagic flux. Our model suggests that SIGMAR1-mediated localized translation of Atg8-family proteins at the ER promotes efficient autophagosome formation, in contrast to recruiting preexisting cytosolic Atg8-family proteins to the lipidation machinery. Elucidating the role of SIGMAR1 in autophagy may provide better therapeutic strategies to prevent or treat autophagy-dependent neurodegenerative diseases, particularly given the highly druggable nature of SIGMAR1.

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