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Wu J, Li H, He J, Tian X, Luo S, Li J, Li W, Zhong J, Zhang H, Huang Z, Sun X, Jiang T. Downregulation of microRNA-9-5p promotes synaptic remodeling in the chronic phase after traumatic brain injury. Cell Death Dis 2021; 12:9. [PMID: 33414448 PMCID: PMC7790831 DOI: 10.1038/s41419-020-03329-5] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2020] [Revised: 12/03/2020] [Accepted: 12/07/2020] [Indexed: 01/29/2023]
Abstract
The level of microRNA-9-5p (miRNA-9-5p) in brain tissues is significantly changed in the chronic phase after traumatic brain injury (TBI). However, the effect of miRNA-9-5p on brain function after TBI has not been elucidated. In this study, we used a controlled cortical impact (CCI) model to induce TBI in Sprague-Dawley rats. Brain microvascular endothelial cells (BMECs), astrocytes, and neurons were extracted from immature Sprague-Dawley rats and cocultured to reconstruct the neurovascular unit (NVU) in vitro. The results showed that downregulation of miRNA-9-5p in the chronic phase contributed to neurological function recovery by promoting astrocyte proliferation and increasing the release of astrocyte-derived neurotrophic factors around injured brain tissues after TBI. A dual-luciferase reporter assay validated that miRNA-9-5p was a post-transcriptional modulator of thrombospondin 2 (Thbs-2), and downregulation of miRNA-9-5p promoted Thbs-2 expression in astrocytes. Furthermore, we verified that Thbs-2 can promote Notch pathway activation by directly binding to Jagged and Notch. Through in vitro experiments, we found that the expression of synaptic proteins and the number of synaptic bodies were increased in neurons in the NVU, which was constructed using astrocytes pretreated with miRNA-9-5p inhibitor. Moreover, we also found that downregulation of miRNA-9-5p promoted Thbs-2 expression in astrocytes, which activated the Notch/cylindromatosis/transforming growth factor-β-activated kinase 1 pathway in neurons and promoted the expression of synaptic proteins, including post-synaptic density protein 95 and synaptotagmin. Based on these results, miRNA-9-5p may be a new promising prognostic marker and treatment target for TBI.
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Affiliation(s)
- Jingchuan Wu
- grid.452206.7Department of Neurosurgery, The First Affiliated Hospital of Chongqing Medical University, Chongqing, 400016 China ,Department of Neurosurgery, General Hospital of The YangTze River Shipping, Wuhan Brain Hospital, Wuhan, Hubei 430014 China
| | - Hui Li
- grid.452206.7Department of Neurosurgery, The First Affiliated Hospital of Chongqing Medical University, Chongqing, 400016 China
| | - Junchi He
- grid.452206.7Department of Neurosurgery, The First Affiliated Hospital of Chongqing Medical University, Chongqing, 400016 China
| | - Xiaocui Tian
- grid.203458.80000 0000 8653 0555College of Pharmacy, Chongqing Key Laboratory of Biochemistry and Molecular Pharmacology, Chongqing Medical University, Chongqing, Yuzhong 400016 China
| | - Shuilian Luo
- grid.413247.7Department of Ultrasound, Zhongnan Hospital of WuHan University, Wuhan, 430071 China
| | - Jiankang Li
- grid.35030.350000 0004 1792 6846Dept of Computer Science, City University of Hong Kong, 83 Tat Chee Ave, Kowloon Hong Kong, China
| | - Wei Li
- grid.410726.60000 0004 1797 8419BGI Education Center, University of Chinese Academy of Sciences, Shenzhen, 518083 China
| | - Jianjun Zhong
- grid.452206.7Department of Neurosurgery, The First Affiliated Hospital of Chongqing Medical University, Chongqing, 400016 China
| | - Hongrong Zhang
- grid.452206.7Department of Neurosurgery, The First Affiliated Hospital of Chongqing Medical University, Chongqing, 400016 China
| | - Zhijian Huang
- grid.452206.7Department of Neurosurgery, The First Affiliated Hospital of Chongqing Medical University, Chongqing, 400016 China
| | - Xiaochuan Sun
- grid.452206.7Department of Neurosurgery, The First Affiliated Hospital of Chongqing Medical University, Chongqing, 400016 China
| | - Tao Jiang
- grid.24696.3f0000 0004 0369 153XDepartment of Neurosurgery, Beijing TianTan Hospital, Capital Medical University, Beijing, 100050 China ,grid.24696.3f0000 0004 0369 153XBeijing Neurosurgical Institute, Capital Medical University, Beijing, 100050 China ,grid.411617.40000 0004 0642 1244China National Clinical Research Center for Neurological diseases, Beijing, China
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