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Updated: Aug 9, 2025
Isolation of Cortical Microglia with Preserved Immunophenotype and Functionality From Murine Neonates
Published on: January 30, 2014
Single-cell analysis identifies Ifi27l2a as a novel gene regulator of microglial inflammation in the context of aging
Gab Seok Kim1, Elisabeth Harmon1, Manuel Gutierrez2
1The University of Texas Health Science Center at Houston.
Abstract:
Microglia are key mediators of inflammatory responses within the brain, as they regulate pro-inflammatory responses while also limiting neuroinflammation via reparative phagocytosis. Thus, identifying genes that modulate microglial function may reveal novel therapeutic interventions for promoting better outcomes in diseases featuring extensive inflammation, such as stroke. To facilitate identification of potential mediators of inflammation, we performed single-cell RNA sequencing of aged mouse brains following stroke and found that Ifi27l2a was significantly up-regulated, particularly in microglia. The increased Ifi27l2a expression was further validated in microglial culture, stroke models with microglial depletion, and human autopsy samples. Ifi27l2a is known to be induced by interferons for viral host defense, however the role of Ifi27l2a in neurodegeneration is unknown. In vitro studies in cultured microglia demonstrated that Ifi27l2a overexpression causes neuroinflammation via reactive oxygen species. Interestingly, hemizygous deletion of Ifi27l2a significantly reduced gliosis in the thalamus following stroke, while also reducing neuroinflammation, indicating Ifi27l2a gene dosage is a critical mediator of neuroinflammation in ischemic stroke. Collectively, this study demonstrates that a novel gene, Ifi27l2a, regulates microglial function and neuroinflammation in the aged brain and following stroke. These findings suggest that Ifi27l2a may be a novel target for conferring cerebral protection post-stroke.
Insights
Researchers identified Ifi27l2a as a key gene modulating microglial function and neuroinflammation after stroke. Reducing Ifi27l2a shows potential for protecting the aged brain and improving stroke outcomes.
Area of Science:
- Neuroscience
- Immunology
- Genetics
Background:
- Microglia are crucial for brain inflammation, balancing pro-inflammatory and reparative functions.
- Identifying genes that regulate microglial activity is vital for developing stroke therapies.
- Stroke involves significant neuroinflammation, impacting aged brains disproportionately.
Approach:
- Single-cell RNA sequencing was used on aged mouse brains post-stroke to identify differentially expressed genes.
- Ifi27l2a upregulation in microglia was confirmed through various experimental models, including human samples.
- In vitro studies investigated the functional role of Ifi27l2a in microglial inflammatory responses.
Key Points:
- Ifi27l2a, typically involved in viral defense, was significantly upregulated in microglia following stroke.
- Overexpression of Ifi27l2a in microglia promoted neuroinflammation via reactive oxygen species.
- Hemizygous deletion of Ifi27l2a reduced stroke-induced gliosis and neuroinflammation, highlighting gene dosage effects.
Conclusions:
- Ifi27l2a acts as a novel regulator of microglial function and neuroinflammation in aged brains, particularly after ischemic stroke.
- Targeting Ifi27l2a presents a potential therapeutic strategy for cerebral protection in stroke patients.
- Further research into Ifi27l2a's role could unlock new treatments for inflammatory neurodegenerative diseases.
