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Isolation and Flow Cytometric Assessment of Neuroimmune Interactions in a Mini-Stroke Murine Model
Published on: June 20, 2025
236
Temporal and Spatial Dynamics of Inflammasome Activation After Ischemic Stroke
Danli Lu1, Mengyan Hu1, Bingjun Zhang1
1Department of Neurology, Mental and Neurological Disease Research Center, The Third Affiliated Hospital of Sun Yat-sen University, Guangzhou, China.
Frontiers in Neurology
|May 10, 2021
Summary
Inflammasome activation, particularly involving Caspase-1 and Caspase-11, exacerbates ischemic stroke outcomes. Inhibiting these inflammasome executors in macrophages offers significant neuroprotection, reducing infarct size and improving neurological deficits.
Area of Science:
- Immunology
- Neuroscience
- Pathology
Background:
- The inflammasome is a key pro-inflammatory complex.
- Its role in ischemic stroke is debated, with unclear molecular players and activation sites.
- Understanding inflammasome dynamics post-stroke is crucial for therapeutic development.
Purpose of the Study:
- To investigate the correlation between inflammasome activation and stroke outcomes in patients and a mouse model.
- To identify the specific inflammasome components, cell types, and locations involved in post-stroke inflammation.
- To evaluate the therapeutic potential of inhibiting key inflammasome executors in ischemic stroke.
Main Methods:
- Analysis of blood samples from stroke patients using flow cytometry.
- Establishment of a transient middle cerebral artery occlusion (tMCAO) mouse model.
- Evaluation of inflammasome component dynamics, cellular localization, and the effects of Caspase-1/-11 inhibition.
Main Results:
- High inflammasome activation levels correlated with detrimental stroke outcomes in both humans and mice.
- Key inflammasome components (NLRP3, Caspase-1, Caspase-11, IL-1β, IL-18, GSDMD) peaked 3-5 days post-stroke in mice.
- Activated inflammasomes were primarily located within infiltrating macrophages in the ischemic brain lesions.
- Inhibition of Caspase-1/-11 signaling significantly reduced inflammasome activation and provided neuroprotection, decreasing infarct size and neurological deficits.
Conclusions:
- Inflammasome activation plays a detrimental role in ischemic stroke pathology.
- Targeting post-stroke inflammasome executing enzymes, particularly within macrophages, holds promise for effective stroke therapies.
