Role of PCBP2 in regulating nanovesicles loaded with curcumin to mitigate neuroferroptosis in neural damage caused by heat stroke.

IF 10.6 1区 生物学 Q1 BIOTECHNOLOGY & APPLIED MICROBIOLOGY
Fei Guo, Yizhan Wu, Guangjun Wang, Jiangwei Liu
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Abstract

Objective: This study aims to elucidate the mechanisms by which nanovesicles (NVs) transport curcumin(CUR) across the blood-brain barrier to treat hypothalamic neural damage induced by heat stroke by regulating the expression of poly(c)-binding protein 2 (PCBP2).

Methods: Initially, NVs were prepared from macrophages using a continuous extrusion method. Subsequently, CUR was loaded into NVs using sonication, yielding engineered cell membrane Nanovesicles loaded with curcumin (NVs-CUR), which were characterized and subjected to in vitro and in vivo tracking analysis. Evaluations included assessing the toxicity of NVs-CUR using the MTT assay, evaluating neuroprotection of NVs-CUR against H2O2-induced oxidative stress damage in PC12 cells, examining effects on cell morphology and quantity, and detecting ferroptosis-related markers through Western blot and transmission electron microscopy (TEM). Proteomic analysis was conducted on PC12 cells treated with NVs (n = 3) and NVs-CUR (n = 3) to identify downstream key factors. Subsequently, the expression of key factors was modulated, and rescue experiments were performed to validate the impact of NVs-CUR through the regulation of key factor expression. Furthermore, a mouse model of hypothalamic neural damage induced by heat stroke was established, where CUR, NVs-CUR, and ferroptosis inducer Erastin were administered to observe mouse survival rates, conduct nerve function deficit scoring, perform histological staining, and measure levels of inflammation and oxidative stress factors in hypothalamic tissue.

Results: NVs-CUR was successfully prepared with excellent stability, serving as an advantageous drug delivery system that effectively targets brain injury sites or neurons both in vitro and in vivo. Subsequent in vitro cell experiments demonstrated the biocompatibility of NVs-CUR, showing superior protective effects against H2O2-induced PC12 cell damage and reduced ferroptosis compared to CUR. Moreover, in the mouse model of hypothalamic neural damage induced by heat stroke, NVs-CUR exhibited enhanced therapeutic effects. Proteomic analysis revealed that NVs-CUR exerted its effects through the regulation of key protein PCBP2; silencing PCBP2 reversed the protective effect of NVs-CUR on neural damage and its inhibition of ferroptosis. Additionally, NVs-CUR regulated solute carrier family 7 member 11 (SLC7A11) expression by PCBP2; overexpression of SLC7A11 reversed the promotion of neural damage and ferroptosis by silencing PCBP2. Animal experiments indicated that ferroptosis inducers reversed the improved survival and nerve function observed with NVs-CUR, silencing PCBP2 reversed the ameliorative effects of NVs-CUR on hypothalamic neural injury induced by heat stroke, and overexpression of SLC7A11 further reversed the adverse effects of silencing PCBP2 on hypothalamic neural injury induced by heat stroke. This suggests that NVs-CUR alleviates hypothalamic neural damage induced by heat stroke by targeting the PCBP2/SLC7A11 axis to reduce neuronal ferroptosis.

Conclusion: This study successfully developed engineered cell membrane NVs-CUR with neuron-targeting properties. NVs-CUR increased the expression of PCBP2, maintained the stability of SLC7A11 mRNA, reduced ferroptosis, and ultimately alleviated hypothalamic neuroinflammation induced by heatstroke.

PCBP2在调节载姜黄素纳米囊泡减轻中暑引起的神经损伤中的作用
目的:研究纳米囊泡(nanovesicles, NVs)通过血脑屏障转运姜黄素(curcumin, CUR),通过调控聚(c)结合蛋白2 (PCBP2)的表达,治疗中暑引起的下丘脑神经损伤的机制。方法:采用连续挤压法制备巨噬细胞NVs。随后,利用超声将姜黄素加载到NVs中,得到装载姜黄素的工程细胞膜纳米囊泡(NVs-CUR),并对其进行了表征和体内外跟踪分析。评估包括使用MTT法评估NVs-CUR的毒性,评估NVs-CUR对h2o2诱导的PC12细胞氧化应激损伤的神经保护作用,检查对细胞形态和数量的影响,并通过Western blot和透射电子显微镜(TEM)检测铁中毒相关标志物。对NVs (n = 3)和NVs- cur (n = 3)处理的PC12细胞进行蛋白质组学分析,确定下游关键因子。随后,通过调控关键因子的表达,并通过救援实验验证NVs-CUR通过调控关键因子表达的影响。此外,建立小鼠中热损伤下丘脑神经模型,给予CUR、nv -CUR和上铁诱导剂Erastin,观察小鼠存活率,进行神经功能缺损评分,进行组织学染色,测量下丘脑组织炎症和氧化应激因子水平。结果:成功制备的NVs-CUR具有良好的稳定性,是一种体外和体内有效靶向脑损伤部位或神经元的药物传递系统。随后的体外细胞实验证明了NVs-CUR的生物相容性,与CUR相比,NVs-CUR对h2o2诱导的PC12细胞损伤具有更好的保护作用,并能降低铁下沉。此外,在小鼠中暑下丘脑神经损伤模型中,NVs-CUR表现出增强的治疗作用。蛋白质组学分析表明,NVs-CUR通过调控关键蛋白PCBP2发挥作用;沉默PCBP2逆转了NVs-CUR对神经损伤的保护作用及其对铁下垂的抑制作用。此外,nv - cur通过PCBP2调控溶质载体家族7成员11 (SLC7A11)的表达;SLC7A11过表达通过沉默PCBP2逆转神经损伤和铁下垂的促进。动物实验表明,上吊铁诱导剂逆转了NVs-CUR所观察到的生存改善和神经功能改善,沉默PCBP2逆转了NVs-CUR对中暑下丘脑神经损伤的改善作用,SLC7A11过表达进一步逆转了沉默PCBP2对中暑下丘脑神经损伤的不利影响。这表明NVs-CUR通过靶向PCBP2/SLC7A11轴减少神经元铁下垂来减轻中暑引起的下丘脑神经损伤。结论:本研究成功制备了具有神经元靶向特性的工程细胞膜NVs-CUR。nv - cur增加了PCBP2的表达,维持了SLC7A11 mRNA的稳定性,减少了铁下垂,最终减轻了中暑引起的下丘脑神经炎症。
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来源期刊
Journal of Nanobiotechnology
Journal of Nanobiotechnology BIOTECHNOLOGY & APPLIED MICROBIOLOGY-NANOSCIENCE & NANOTECHNOLOGY
CiteScore
13.90
自引率
4.90%
发文量
493
审稿时长
16 weeks
期刊介绍: Journal of Nanobiotechnology is an open access peer-reviewed journal communicating scientific and technological advances in the fields of medicine and biology, with an emphasis in their interface with nanoscale sciences. The journal provides biomedical scientists and the international biotechnology business community with the latest developments in the growing field of Nanobiotechnology.
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