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Updated: May 23, 2025
Characterization and Isolation of Mouse Primary Microglia by Density Gradient Centrifugation
Published on: February 16, 2018
Targeting CD74 in microglia to modulate experimental cerebral ischemia and reperfusion injury: insights from
Chang Cao1,2, Ting Liu3, Lu Peng1,2
1Department of Neurosurgery & Brain and Nerve Research Laboratory, The First Affiliated Hospital of Soochow University, Soochow University, Suzhou, 215006, China.
Abstract:
Ischemic stroke remains a leading cause of mortality and long-term disability, with reperfusion injury contributing significantly to poor clinical outcomes. Microglia, the primary immune cells of the central nervous system, play a dual role in ischemic stroke by both exacerbating injury through neuroinflammation and supporting recovery through neuroprotection. This study aimed to explore the role of CD74, a gene upregulated in microglia following ischemia-reperfusion injury. Using single-cell RNA sequencing and bulk RNA sequencing, we identified CD74 as a potential target involved in microglial-mediated neuroinflammation. We observed a significant increase in CD74 expression in microglia following middle cerebral artery occlusion/reperfusion (MCAO/R), which correlated with pro-inflammatory cytokine production and neuroinflammation. Targeted knockdown of CD74 in microglia using CX3CR1Cre/ERT2 mice led to a reduction in infarct volume, inflammatory cytokine levels, and long-term neurological deficits. Behavioral tests showed improved motor coordination, sensory function, and exploratory behavior in CD74 knockdown mice. These results suggest that CD74 is a critical mediator of microglia-driven neuroinflammation, and targeting CD74 may represent a promising therapeutic strategy for reducing ischemic brain injury and promoting recovery after stroke.
Insights
Targeting CD74 in microglia reduces brain damage after ischemic stroke. This gene is crucial for neuroinflammation, and inhibiting it improves recovery and neurological function in stroke models.
Area of Science:
- Neuroscience
- Immunology
- Genetics
Background:
- Ischemic stroke causes significant mortality and disability.
- Reperfusion injury exacerbates stroke outcomes.
- Microglia have a dual role in stroke, mediating both inflammation and protection.
Purpose of the Study:
- To investigate the role of CD74, a gene upregulated in microglia after ischemic injury.
- To determine if CD74 mediates microglial neuroinflammation in stroke.
Main Methods:
- Single-cell and bulk RNA sequencing to identify CD74's role.
- Middle cerebral artery occlusion/reperfusion (MCAO/R) model in mice.
- Targeted knockdown of CD74 in microglia using CX3CR1Cre/ERT2 mice.
Main Results:
- CD74 expression increased in microglia post-MCAO/R, correlating with inflammation.
- CD74 knockdown reduced infarct volume and inflammatory cytokine levels.
- Behavioral tests demonstrated improved neurological function in CD74 knockdown mice.
Conclusions:
- CD74 is a key mediator of microglia-driven neuroinflammation in ischemic stroke.
- Targeting CD74 offers a potential therapeutic strategy for stroke recovery.
- Inhibition of CD74 ameliorates brain injury and neurological deficits post-stroke.
