化学调节 SQSTM1/p62 介导的异噬作用,靶向广泛的致病菌。

Chemical modulation of SQSTM1/p62-mediated xenophagy that targets a broad range of pathogenic bacteria.

机构信息

Cellular Degradation Biology Center and Department of Biomedical Sciences, College of Medicine, Seoul National University, Seoul, Republic of Korea.

Department of Microbiology, Chungnam National University School of Medicine, Daejeon, Korea.

出版信息

Autophagy. 2022 Dec;18(12):2926-2945. doi: 10.1080/15548627.2022.2054240. Epub 2022 Apr 5.

Abstract

The N-degron pathway is a proteolytic system in which the N-terminal degrons (N-degrons) of proteins, such as arginine (Nt-Arg), induce the degradation of proteins and subcellular organelles via the ubiquitin-proteasome system (UPS) or macroautophagy/autophagy-lysosome system (hereafter autophagy). Here, we developed the chemical mimics of the N-degron Nt-Arg as a pharmaceutical means to induce targeted degradation of intracellular bacteria via autophagy, such as serovar Typhimurium (. Typhimurium), , and as well as (Mtb). Upon binding the ZZ domain of the autophagic cargo receptor SQSTM1/p62 (sequestosome 1), these chemicals induced the biogenesis and recruitment of autophagic membranes to intracellular bacteria via SQSTM1, leading to lysosomal degradation. The antimicrobial efficacy was independent of rapamycin-modulated core autophagic pathways and synergistic with the reduced production of inflammatory cytokines. In mice, these drugs exhibited antimicrobial efficacy for . Typhimurium, Bacillus Calmette-Guérin (BCG), and Mtb as well as multidrug-resistant Mtb and inhibited the production of inflammatory cytokines. This dual mode of action in xenophagy and inflammation significantly protected mice from inflammatory lesions in the lungs and other tissues caused by all the tested bacterial strains. Our results suggest that the N-degron pathway provides a therapeutic target in host-directed therapeutics for a broad range of drug-resistant intracellular pathogens.: ATG: autophagy-related gene; BCG: Bacillus Calmette-Guérin; BMDMs: bone marrow-derived macrophages; CALCOCO2/NDP52: calcium binding and coiled-coil domain 2; CFUs: colony-forming units; CXCL: C-X-C motif chemokine ligand; EGFP: enhanced green fluorescent protein; IL1B/IL-1β: interleukin 1 beta; IL6: interleukin 6; LIR: MAP1LC3/LC3-interacting region; MAP1LC3/LC3: microtubule associated protein 1 light chain 3; Mtb: ; MTOR: mechanistic target of rapamycin kinase; NBR1: NBR1 autophagy cargo receptor; OPTN: optineurin; PB1: Phox and Bem1; SQSTM1/p62: sequestosome 1; . Typhimurium: serovar Typhimurium; TAX1BP1: Tax1 binding protein 1; TNF: tumor necrosis factor; UBA: ubiquitin-associated.

摘要

N 肽段途径是一种蛋白水解系统,其中蛋白的 N 端肽段(N-肽段),如精氨酸(Nt-Arg),通过泛素-蛋白酶体系统(UPS)或巨自噬/自噬溶酶体系统(自噬)诱导蛋白和细胞内细胞器的降解。在这里,我们开发了 N 肽段 Nt-Arg 的化学模拟物作为一种药物手段,通过自噬诱导细胞内细菌的靶向降解,如肠炎沙门氏菌(. Typhimurium)、李斯特菌(Listeria)、分枝杆菌(Mtb)以及铜绿假单胞菌(Pseudomonas aeruginosa)。这些化学物质与自噬货物受体 SQSTM1/p62(自噬体 1)的 ZZ 结构域结合,通过 SQSTM1 诱导自噬膜的生物发生和募集到细胞内细菌,导致溶酶体降解。抗菌效果不依赖于雷帕霉素调节的核心自噬途径,与减少炎症细胞因子的产生具有协同作用。在小鼠中,这些药物对肠炎沙门氏菌、卡介苗(BCG)和 Mtb 以及多药耐药 Mtb 表现出抗菌效果,并抑制炎症细胞因子的产生。这种异源吞噬和炎症的双重作用模式显著保护了小鼠免受所有测试细菌菌株引起的肺部和其他组织的炎症病变。我们的结果表明,N 肽段途径为宿主导向治疗提供了一个针对广泛耐药的细胞内病原体的治疗靶点。: ATG: 自噬相关基因; BCG: 卡介苗; BMDMs: 骨髓来源的巨噬细胞; CALCOCO2/NDP52: 钙结合和卷曲螺旋域 2; CFUs: 集落形成单位; CXCL: C-X-C 基序趋化因子配体; EGFP: 增强型绿色荧光蛋白; IL1B/IL-1β: 白细胞介素 1β; IL6: 白细胞介素 6; LIR: MAP1LC3/LC3 相互作用区域; MAP1LC3/LC3: 微管相关蛋白 1 轻链 3; Mtb: 结核分枝杆菌; MTOR: 雷帕霉素靶蛋白激酶; NBR1: NBR1 自噬货物受体; OPTN: 视神经病变蛋白; PB1: Phox 和 Bem1; SQSTM1/p62: 自噬体 1;. Typhimurium: 肠炎沙门氏菌; TAX1BP1: Tax1 结合蛋白 1; TNF: 肿瘤坏死因子; UBA: 泛素相关。

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