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定量蛋白质组学揭示了干细胞移植治疗缺血性中风后广泛的微环境变化。

Quantitative proteomics revealed extensive microenvironmental changes after stem cell transplantation in ischemic stroke.

机构信息

Department of Nuclear Medicine and Medical PET Center, The Second Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, 310009, China.

Institute of Nuclear Medicine and Molecular Imaging, Zhejiang University, Hangzhou, 310009, China.

出版信息

Front Med. 2022 Jun;16(3):429-441. doi: 10.1007/s11684-021-0842-9. Epub 2021 Jul 9.

Abstract

The local microenvironment is essential to stem cell-based therapy for ischemic stroke, and spatiotemporal changes of the microenvironment in the pathological process provide vital clues for understanding the therapeutic mechanisms. However, relevant studies on microenvironmental changes were mainly confined in the acute phase of stroke, and long-term changes remain unclear. This study aimed to investigate the microenvironmental changes in the subacute and chronic phases of ischemic stroke after stem cell transplantation. Herein, induced pluripotent stem cells (iPSCs) and neural stem cells (NSCs) were transplanted into the ischemic brain established by middle cerebral artery occlusion surgery. Positron emission tomography imaging and neurological tests were applied to evaluate the metabolic and neurofunctional alterations of rats transplanted with stem cells. Quantitative proteomics was employed to investigate the protein expression profiles in iPSCs-transplanted brain in the subacute and chronic phases of stroke. Compared with NSCs-transplanted rats, significantly increased glucose metabolism and neurofunctional scores were observed in iPSCs-transplanted rats. Subsequent proteomic data of iPSCs-transplanted rats identified a total of 39 differentially expressed proteins in the subacute and chronic phases, which are involved in various ischemic stroke-related biological processes, including neuronal survival, axonal remodeling, antioxidative stress, and mitochondrial function restoration. Taken together, our study indicated that iPSCs have a positive therapeutic effect in ischemic stroke and emphasized the wide-ranging microenvironmental changes in the subacute and chronic phases.

摘要

局部微环境对缺血性脑卒中的干细胞治疗至关重要,微环境在病理过程中的时空变化为理解治疗机制提供了重要线索。然而,相关的微环境变化研究主要局限于脑卒中的急性期,而长期变化尚不清楚。本研究旨在探讨干细胞移植后缺血性脑卒中亚急性期和慢性期的微环境变化。在此,通过大脑中动脉闭塞手术建立缺血性脑模型,将诱导多能干细胞(iPSCs)和神经干细胞(NSCs)移植入其中。通过正电子发射断层扫描成像和神经功能测试评估移植干细胞后大鼠的代谢和神经功能改变。采用定量蛋白质组学技术研究 iPSCs 移植脑在脑卒中亚急性期和慢性期的蛋白质表达谱。与 NSCs 移植大鼠相比,iPSCs 移植大鼠的葡萄糖代谢和神经功能评分显著增加。随后对 iPSCs 移植大鼠的蛋白质组学数据进行分析,共鉴定出亚急性期和慢性期 39 种差异表达蛋白,这些蛋白参与多种与缺血性脑卒中相关的生物学过程,包括神经元存活、轴突重塑、抗氧化应激和线粒体功能恢复。综上所述,本研究表明 iPSCs 对缺血性脑卒中具有积极的治疗效果,并强调了亚急性期和慢性期广泛的微环境变化。

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