Exosomes originating from neural stem cells undergoing necroptosis participate in cellular communication by inducing TSC2 upregulation of recipient cells following spinal cord injury

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外文摘要：We previously demonstrated that inhibiting neural stem cells necroptosis enhances functional recovery after spinal cord injury.While exosomes are recognized as playing a pivotal role in neural stem cells exocrine function,their precise function in spinal cord injury remains unclear.To investigate the role of exosomes generated following neural stem cells necroptosis after spinal cord injury,we conducted single-cell RNA sequencing and validated that neural stem cells originate from ependymal cells and undergo necroptosis in response to spinal cord injury.Subsequently,we established an in vitro necroptosis model using neural stem cells isolated from embryonic mice aged 16-17 days and extracted exosomes.The results showed that necroptosis did not significantly impact the fundamental characteristics or number of exosomes.Transcriptome sequencing of exosomes in necroptosis group identified 108 differentially expressed messenger RNAs,104 long non-coding RNAs,720 circular RNAs,and 14 microRNAs compared with the control group.Construction of a competing endogenous RNA network identified the following hub genes:tuberous sclerosis 2(Tsc2),solute carrier family 16 member 3(Slc16a3),and forkhead box protein P1(Foxp1).Notably,a significant elevation in TSC2 expression was observed in spinal cord tissues following spinal cord injury.TSC2-positive cells were localized around SRY-box transcription factor 2-positive cells within the injury zone.Furthermore,in vitro analysis revealed increased TSC2 expression in exosomal receptor cells compared with other cells.Further assessment of cellular communication following spinal cord injury showed that Tsc2 was involved in ependymal cellular communication at 1 and 3 days post-injury through the epidermal growth factor and midkine signaling pathways.In addition,Slc16a3 participated in cellular communication in ependymal cells at 7 days post-injury via the vascular endothelial growth factor and macrophage migration inhibitory factor signaling pathways.Collectively,these findings confirm that exosomes derived from neural stem cells undergoing necroptosis play an important role in cellular communication after spinal cord injury and induce TSC2 upregulation in recipient cells.

外文关键词：

cellular communicationcompeting endogenous RNAexosomesFoxp1necroptosisneural stem cellsSlc16a3spinal cord injurytranscriptome sequencingTsc2

作者：

Shiming Li、Jianfeng Li、Guoliang Chen、Tao Lin、Penghui Zhang、Kuileung Tong、Ningning Chen、Shaoyu Liu

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作者单位：

Shenzhen Key Laboratory of Bone Tissue Repair and Translational Research,Department of Orthopedic Surgery,The Seventh Affiliated Hospital,Sun Yat-sen University,Shenzhen,Guangdong Province,China

Department of Orthopedic Surgery,The First Affiliated Hospital of Jinan University,Guangzhou,Guangdong Province,China

Department of Orthopedics and Traumatology,Zhujiang Hospital,Southern Medical University,Guangzhou,Guangdong Province,China

Department of Orthopedic Surgery,The Third Affiliated Hospital of Sun Yat-sen University,Guangzhou,Guangdong Province,China

Department of Orthopedic Surgery,The First Affiliated Hospital of Sun Yat-sen University,Guangzhou,Guangdong Province,China

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出版年：

2025

DOI：

10.4103/NRR.NRR-D-24-00068

中国神经再生研究(英文版)

中国康复医学会

中国神经再生研究(英文版)

影响因子：0.902

ISSN：1673-5374

年,卷(期)：2025.20(11)