Objective:

To define the role of the AIM2 inflammasome in neurons following traumatic brain injury (TBI) and its contribution to cognitive decline.

Approach:

Key Findings:

• CCI activated the AIM2 inflammasome in cortical and hippocampal neurons, leading to neuronal pyroptosis and CA3 neuronal loss.
• AIM2 knockdown in CA3 neurons reduced neuronal loss and improved cognitive performance in behavioral tests.
• Mechanical injury caused early release of mitochondrial DNA (mtDNA) into the cytosol, activating the AIM2 inflammasome and promoting pyroptosis.
• GSDMD-NT fragments translocated to mitochondria, disrupting mitochondrial function and promoting further mtDNA leakage.
• Caspase-1 inhibition after injury suppressed a second wave of mtDNA release and attenuated late-phase neuronal damage.

Interpretation:

The study identifies a self-perpetuating GSDMD–mtDNA–AIM2 inflammasome pathway as a critical driver of cognitive decline following TBI.

Limitations:

• The study primarily uses animal models, which may not fully replicate human TBI responses.
• Further research is needed to explore the long-term effects of AIM2 inhibition on cognitive function.

Conclusion:

The findings highlight the importance of the neuron-intrinsic GSDMD–mtDNA–AIM2 axis in TBI-related cognitive decline.

Attribution Notice

This content is an AI-generated, fully rewritten summary based on a published scholarly article. It does not reproduce the original text and is not a substitute for the original publication. Readers are encouraged to consult the source for full context, data, and methodology.