Modular Nanotransporters Deliver Anti-Keap1 Monobody into Mouse Hepatocytes, Thereby Inhibiting Production of Reactive Oxygen Species.

IF 4.9 3区 医学 Q1 PHARMACOLOGY & PHARMACY Pharmaceutics Pub Date : 2024-10-21 DOI:10.3390/pharmaceutics16101345
Yuri V Khramtsov, Alexey V Ulasov, Andrey A Rosenkranz, Tatiana A Slastnikova, Tatiana N Lupanova, Georgii P Georgiev, Alexander S Sobolev
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Abstract

Background/Objectives: The study of oxidative stress in cells and ways to prevent it attract increasing attention. Antioxidant defense of cells can be activated by releasing the transcription factor Nrf2 from a complex with Keap1, its inhibitor protein. The aim of the work was to study the effect of the modular nanotransporter (MNT) carrying an R1 anti-Keap1 monobody (MNTR1) on cell homeostasis. Methods: The murine hepatocyte AML12 cells were used for the study. The interaction of fluorescently labeled MNTR1 with Keap1 fused to hrGFP was studied using the Fluorescence-Lifetime Imaging Microscopy-Förster Resonance Energy Transfer (FLIM-FRET) technique on living AML12 cells transfected with the Keap1-hrGFP gene. The release of Nrf2 from the complex with Keap1 and its levels in the cytoplasm and nuclei of the AML12 cells were examined using a cellular thermal shift assay (CETSA) and confocal laser scanning microscopy, respectively. The effect of MNT on the formation of reactive oxygen species was studied by flow cytometry using 6-carboxy-2',7'-dichlorodihydrofluorescein diacetate. Results: MNTR1 is able to interact with Keap1 in the cytoplasm, leading to the release of Nrf2 from the complex with Keap1 and a rapid rise in Nrf2 levels both in the cytoplasm and nuclei, ultimately causing protection of cells from the action of hydrogen peroxide. The possibility of cleavage of the monobody in endosomes leads to an increase in the observed effects. Conclusions: These findings open up a new approach to specifically modulating the interaction of intracellular proteins, as demonstrated by the example of the Keap1-Nrf2 system.

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模块化纳米转运体将抗 Keap1 单体送入小鼠肝细胞,从而抑制活性氧的产生。
背景/目的:细胞氧化应激的研究和预防氧化应激的方法日益受到关注。细胞的抗氧化防御可通过释放转录因子 Nrf2 与其抑制蛋白 Keap1 的复合物来激活。这项工作的目的是研究携带 R1 抗 Keap1 单体(MNTR1)的模块化纳米转运体(MNT)对细胞稳态的影响。研究方法研究使用小鼠肝细胞 AML12 细胞。在转染了 Keap1-hrGFP 基因的活体 AML12 细胞上,使用荧光终生成像显微镜-佛尔斯特共振能量转移(FLIM-FRET)技术研究了荧光标记的 MNTR1 与融合了 hrGFP 的 Keap1 的相互作用。利用细胞热转移试验(CETSA)和激光共聚焦扫描显微镜分别检测了Nrf2与Keap1复合物的释放情况及其在AML12细胞胞质和细胞核中的水平。流式细胞仪使用 6-羧基-2',7'-二氯二氢荧光素二乙酸酯研究了 MNT 对活性氧形成的影响。结果显示MNTR1 能够与细胞质中的 Keap1 相互作用,导致 Nrf2 从与 Keap1 的复合物中释放出来,并使细胞质和细胞核中的 Nrf2 水平迅速上升,最终保护细胞免受过氧化氢的作用。单体在内质体中被裂解的可能性会增加所观察到的效果。结论:正如 Keap1-Nrf2 系统的例子所证明的那样,这些发现为特异性调节细胞内蛋白质的相互作用开辟了一条新途径。
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来源期刊
Pharmaceutics
Pharmaceutics Pharmacology, Toxicology and Pharmaceutics-Pharmaceutical Science
CiteScore
7.90
自引率
11.10%
发文量
2379
审稿时长
16.41 days
期刊介绍: Pharmaceutics (ISSN 1999-4923) is an open access journal which provides an advanced forum for the science and technology of pharmaceutics and biopharmaceutics. It publishes reviews, regular research papers, communications,  and short notes. Covered topics include pharmacokinetics, toxicokinetics, pharmacodynamics, pharmacogenetics and pharmacogenomics, and pharmaceutical formulation. Our aim is to encourage scientists to publish their experimental and theoretical details in as much detail as possible. There is no restriction on the length of the papers. The full experimental details must be provided so that the results can be reproduced.
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