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Published on: July 23, 2012
Transcriptome Analysis of Microglia Reveals That the TLR2/IRF7 Signaling Axis Mediates Neuroinflammation After
Shenbin Xu1, Shuhao Mei1, Jianan Lu1
1Department of Neurosurgery, Second Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou, China.
Abstract:
Microglia-mediated neuroinflammatory response in the early brain injury after subarachnoid hemorrhage (SAH) has been reported to have an impact on progress, and the mechanism is not completely understood. Here, we performed genome-wide transcriptome analysis of microglia purified from damaged hemisphere of adult mice at 3 days after SAH or sham operation. Robust transcriptional changes were observed between SAH-induced and healthy microglia, indicating rapid activation of microglia after suffering from SAH. We identified 1576 differentially expressed genes (DEGs; 928 upregulated and 648 downregulated) in SAH-induced microglia compared with sham microglia, representing a strong alteration of the genome (6.85% of total ∼23,000 genes). Functional enrichment of these DEGs indicated that cell division, inflammatory response, cytokine production, and leukocyte chemotaxis were strongly activated in SAH-induced microglia. Moreover, we identified and proved that the TLR2/IRF7 signaling axis was involved in the regulation of this microglia-mediated inflammation in SAH mice by performing flow cytometry and immunofluorescence. Together, these results provided a perspective of microglia-mediated neuroinflammatory response in the early stage of SAH and might give a new therapeutic target for SAH.
Insights
Microglia rapidly activate after subarachnoid hemorrhage (SAH), driving neuroinflammation. The TLR2/IRF7 pathway is identified as a key regulator, offering potential therapeutic targets for early brain injury.
Area of Science:
- Neuroscience
- Immunology
- Genomics
Background:
- Microglia-mediated neuroinflammation plays a role in early brain injury following subarachnoid hemorrhage (SAH).
- The precise mechanisms underlying this response remain incompletely understood.
Purpose of the Study:
- To investigate the genome-wide transcriptional changes in microglia during the early stages of SAH.
- To identify key molecular pathways and signaling axes involved in microglia activation post-SAH.
Main Methods:
- Genome-wide transcriptome analysis of microglia isolated from adult mice 3 days after SAH or sham operation.
- Identification and validation of differentially expressed genes (DEGs).
- Flow cytometry and immunofluorescence assays to confirm signaling pathway involvement.
Main Results:
- Significant transcriptional alterations were observed in SAH-induced microglia compared to sham controls.
- 1576 differentially expressed genes were identified, with notable enrichment in cell division, inflammatory response, cytokine production, and leukocyte chemotaxis.
- The TLR2/IRF7 signaling axis was confirmed to be involved in regulating microglia-mediated inflammation in SAH.
Conclusions:
- Microglia exhibit rapid activation and a robust inflammatory response in the early phase of SAH.
- The TLR2/IRF7 signaling pathway is a critical component of this neuroinflammatory response.
- Targeting this pathway presents a potential therapeutic strategy for managing early brain injury after SAH.
