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Updated: May 26, 2026
Isolation and Functional Analysis of Mitochondria from Cultured Cells and Mouse Tissue
Published on: March 23, 2015
Mitochondrial oxidative stress and epilepsy in SOD2 deficient mice: attenuation by a lipophilic metalloporphyrin
Li-Ping Liang1, Simon Waldbaum, Shane Rowley
1Department of Pharmaceutical Sciences, University of Colorado Denver, Aurora, CO 80045, USA.
Abstract:
Epileptic seizures are a common feature associated with inherited mitochondrial diseases. This study investigated the role of mitochondrial oxidative stress in epilepsy resulting from mitochondrial dysfunction using cross-bred mutant mice lacking mitochondrial manganese superoxide dismutase (MnSOD or SOD2) and a lipophilic metalloporphyrin catalytic antioxidant. Video-EEG monitoring revealed that in the second to third week of postnatal life (P14-P21) B6D2F2 Sod2(-/-) mice exhibited frequent spontaneous motor seizures providing evidence that oxidative stress-induced mitochondrial dysfunction may contribute to epileptic seizures. To confirm the role of mitochondrial oxidative stress in epilepsy a newly developed lipophilic metalloporphyrin, AEOL 11207, with high potency for catalytic removal of endogenously generated reactive oxygen species was utilized. AEOL 11207-treated Sod2(-/-) mice showed a significant decrease in both the frequency and duration of spontaneous seizures but no effect on seizure severity. A significant increase in the average lifespan of AEOL 11207-treated Sod2(-/-) mice compared to vehicle-treated Sod2(-/-) mice was also observed. Indices of mitochondrial oxidative stress and damage (aconitase inactivation, 3-nitrotyrosine formation, and depletion of reduced coenzyme A) and ATP levels affecting neuronal excitability were significantly attenuated in the brains of AEOL 11207-treated Sod2(-/-) mice compared to vehicle-treated Sod2(-/-) mice. The occurrence of epileptic seizures in Sod2(-/-) mice and the ability of catalytic antioxidant therapy to attenuate seizure activity, mitochondrial dysfunction, and ATP levels suggest that ongoing mitochondrial oxidative stress can contribute to epilepsy associated with mitochondrial dysfunction and disease.
Insights
Mitochondrial dysfunction causes oxidative stress, leading to epileptic seizures in Sod2(-/-) mice. Catalytic antioxidant therapy reduced seizure frequency and duration, improving lifespan and brain health.
Area of Science:
- Neuroscience
- Mitochondrial Biology
- Epilepsy Research
Background:
- Inherited mitochondrial diseases frequently manifest with epileptic seizures.
- Mitochondrial dysfunction is implicated in various neurological disorders, including epilepsy.
- Oxidative stress plays a critical role in cellular damage and disease pathogenesis.
Purpose of the Study:
- To investigate the role of mitochondrial oxidative stress in epilepsy.
- To evaluate the therapeutic potential of a catalytic antioxidant in mitigating seizures associated with mitochondrial dysfunction.
Main Methods:
- Utilized B6D2F2 Sod2(-/-) mice, which lack mitochondrial manganese superoxide dismutase (MnSOD or SOD2), to model mitochondrial dysfunction and oxidative stress.
- Employed video-EEG monitoring to assess seizure activity.
- Administered a lipophilic metalloporphyrin catalytic antioxidant (AEOL 11207) to evaluate its effects on seizure parameters, lifespan, and biochemical markers of oxidative stress.
Main Results:
- Sod2(-/-) mice exhibited spontaneous motor seizures between postnatal days 14-21.
- AEOL 11207 treatment significantly reduced seizure frequency and duration but not severity.
- Mice treated with AEOL 11207 showed a significant increase in average lifespan and attenuated markers of mitochondrial oxidative stress and damage in the brain.
Conclusions:
- Mitochondrial oxidative stress contributes to the development of epileptic seizures in the context of mitochondrial dysfunction.
- Catalytic antioxidant therapy offers a promising strategy for managing epilepsy associated with mitochondrial diseases.
- Targeting mitochondrial oxidative stress can improve neurological outcomes and extend lifespan in relevant disease models.
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