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Sustained developmental endothelial locus-1 overexpression promotes spinal cord injury recovery in mice through the SIRT1/SERCA2 signaling pathway.
Brain Research Bulletin 2022 January 30
Although the anti-inflammatory properties of developmental endothelial locus-1 (DEL-1) are well known, few studies have examined the role of DEL-1 in spinal cord injury (SCI). Here, the protective effect of DEL-1 on SCI was investigated using hypoxia/recovery (H/R) injury of astrocytes and a mouse SCI model. The effects of DEL-1 overexpression/silencing on primary astrocytes were assessed by flow cytometry, immunofluorescence, and western blotting. Female Sprague-Dawley rats were intrathecally injected with recombinant adeno-associated virus (AAV) at T10, and DEL-1 was permanently expressed. Protein levels in the spinal cord, functional testing, and electrophysiology, pathology, and immunofluorescence were all measured after treatment. DEL-1 overexpression significantly increased the expression of SIRT1/SERCA2At the same time, inflammation, endoplasmic reticulum stress, and apoptosis were all significantly inhibited, the motor function of SCI rats was noticeably restored, and the myelin sheath of the injured site was more complete. Furthermore, after DEL-1 silencing SIRT1/SERCA2 expression decreased, while inflammation, endoplasmic reticulum stress, and apoptotic responses increased significantly. DEL-1 treatment, however, did not increase SERCA2 expression after SIRT1 silencing. These findings demonstrate that DEL-1 protects against SCI via SIRT1/SERCA2 signaling, promoting spinal neural recovery.
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