刺
MFN2型
下调和上调
细胞生物学
线粒体
细胞质
脊髓损伤
神经科学
医学
线粒体融合
化学
线粒体DNA
生物
脊髓
物理
生物化学
热力学
基因
作者
Fei‐Long Wei,T. Wang,C. Wang,Zhen‐Peng Zhang,J. W. Zhao,Heng Wei,Zhen Tang,Ming‐Rui Du,Xiaodong Yan,Xiao‐Xiang Li,Zheng Guo,Jixian Qian,Cuihong Zhou
标识
DOI:10.1002/advs.202305442
摘要
Abstract Neuroinflammation is associated with poor outcomes in patients with spinal cord injury (SCI). Recent studies have demonstrated that stimulator of interferon genes (Sting) plays a key role in inflammatory diseases. However, the role of Sting in SCI remains unclear. In the present study, it is found that increased Sting expression is mainly derived from activated microglia after SCI. Interestingly, knockout of Sting in microglia can improve the recovery of neurological function after SCI. Microglial Sting knockout restrains the polarization of microglia toward the M1 phenotype and alleviates neuronal death. Furthermore, it is found that the downregulation of mitofusin 2 (Mfn2) expression in microglial cells leads to an imbalance in mitochondrial fusion and division, inducing the release of mitochondrial DNA (mtDNA), which mediates the activation of the cGas‐Sting signaling pathway and aggravates inflammatory response damage after SCI. A biomimetic microglial nanoparticle strategy to deliver MASM7 (named MSNs‐MASM7@MI) is established. In vitro, MSNs‐MASM7@MI showed no biological toxicity and effectively delivered MASM7. In vivo, MSNs‐MASM7@MI improves nerve function after SCI. The study provides evidence that cGas‐Sting signaling senses Mfn2‐dependent mtDNA release and that its activation may play a key role in SCI. These findings provide new perspectives and potential therapeutic targets for SCI treatment.
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