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Updated: May 12, 2026
Acute Brain Trauma in Mice Followed By Longitudinal Two-photon Imaging
Published on: April 6, 2014
Targeting mitofusin 1-mediated mitochondrial dynamics to suppress neuroinflammation and pyroptosis after traumatic
1Department of Neurosurgery, Xuanwu Hospital, Capital Medical University, 45 Changchun Street, Xicheng District, Beijing 100053, China.
Background:
Traumatic brain injury (TBI) can cause neuroinflammation and neuronal death. The role of mitochondrial dysfunction in regulating inflammasome activation during TBI remains unclear. This study aims to explore mitochondrial regulation of neuroinflammation and pyroptosis after TBI.
Methods:
We used a mouse TBI model and in vitro scratch-injured HT22 cells and primary neurons to examine changes in mitochondrial dynamics and nucleotide-binding oligomerization domain-like receptors family pyrin domain-containing 3 (NLRP3) inflammasome activation. Metformin treatment, mitofusin 1 (Mfn1) knockdown and regulation of the Mfn1 pathway were applied to evaluate the therapeutic effects and mechanisms.
Results:
TBI triggered NLRP3 inflammasome activation and neuronal pyroptosis, along with impaired mitochondrial function and oxidative stress. Metformin reduced inflammasome activation, improved mitochondrial homeostasis, and alleviated neuronal injury. These effects were lost when Mfn1 was silenced, highlighting its essential role. Furthermore, we determined that the AMPK pathway modulates these observed effects.
Conclusion:
Metformin protects against TBI-induced neuronal damage by restoring Mfn1-dependent mitochondrial dynamics and suppressing inflammasome activation. Mfn1 is a key mediator linking mitochondrial health to neuroinflammatory responses in TBI.
Insights
Metformin protects brain cells after traumatic brain injury (TBI) by improving mitochondrial function and reducing harmful inflammation. Mitofusin 1 (Mfn1) is crucial for these protective effects, linking mitochondrial health to TBI recovery.
Area of Science:
- Neuroscience
- Cell Biology
- Biochemistry
Background:
- Traumatic brain injury (TBI) is associated with neuroinflammation and neuronal death.
- The specific role of mitochondrial dysfunction in inflammasome activation post-TBI requires further elucidation.
- Understanding mitochondrial regulation of neuroinflammation and pyroptosis is critical for TBI research.
Purpose of the Study:
- To investigate the role of mitochondrial dysfunction in regulating inflammasome activation following TBI.
- To explore the therapeutic potential of metformin in mitigating TBI-induced neuroinflammation and neuronal death.
- To elucidate the involvement of mitofusin 1 (Mfn1) in TBI pathogenesis and its response to metformin treatment.
Main Methods:
- Utilized a mouse model of TBI and in vitro models (scratch-injured HT22 cells, primary neurons).
- Assessed changes in mitochondrial dynamics and NLRP3 inflammasome activation.
- Investigated the effects of metformin treatment, Mfn1 knockdown, and Mfn1 pathway modulation.
Main Results:
- TBI induced NLRP3 inflammasome activation, neuronal pyroptosis, mitochondrial dysfunction, and oxidative stress.
- Metformin treatment attenuated inflammasome activation, enhanced mitochondrial homeostasis, and reduced neuronal injury.
- The protective effects of metformin were dependent on Mfn1, with Mfn1 silencing abolishing these benefits; the AMPK pathway was identified as a modulator.
Conclusions:
- Metformin confers neuroprotection against TBI by restoring Mfn1-dependent mitochondrial dynamics and inhibiting inflammasome activation.
- Mfn1 serves as a pivotal mediator connecting mitochondrial integrity with neuroinflammatory responses in the context of TBI.
- Targeting Mfn1-mediated mitochondrial pathways presents a potential therapeutic strategy for TBI.
