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Induction of the Nrf2 Pathway by Sulforaphane Is Neuroprotective in a Rat Temporal Lobe Epilepsy Model
Sereen Sandouka1, Tawfeeq Shekh-Ahmad1
1Institute for Drug Research, The School of Pharmacy, Faculty of Medicine, The Hebrew University of Jerusalem, Jerusalem 91120, Israel.
Abstract:
Epilepsy is a chronic disease of the brain that affects over 65 million people worldwide. Acquired epilepsy is initiated by neurological insults, such as status epilepticus, which can result in the generation of ROS and induction of oxidative stress. Suppressing oxidative stress by upregulation of the transcription factor, nuclear factor erythroid 2-related factor 2 (Nrf2) has been shown to be an effective strategy to increase endogenous antioxidant defences, including in brain diseases, and can ameliorate neuronal damage and seizure occurrence in epilepsy. Here, we aim to test the neuroprotective potential of a naturally occurring Nrf2 activator sulforaphane, in in vitro epileptiform activity model and a temporal lobe epilepsy rat model. Sulforaphane significantly decreased ROS generation during epileptiform activity, restored glutathione levels, and prevented seizure-like activity-induced neuronal cell death. When given to rats after 2 h of kainic acid-induced status epilepticus, sulforaphane significantly increased the expression of Nrf2 and related antioxidant genes, improved oxidative stress markers, and increased the total antioxidant capacity in both the plasma and hippocampus. In addition, sulforaphane significantly decreased status epilepticus-induced neuronal cell death. Our results demonstrate that Nrf2 activation following an insult to the brain exerts a neuroprotective effect by reducing neuronal death, increasing the antioxidant capacity, and thus may also modify epilepsy development.
Insights
Sulforaphane, a natural Nrf2 activator, reduces oxidative stress and neuronal death in epilepsy models. This compound shows potential for treating acquired epilepsy by enhancing antioxidant defenses and protecting the brain.
Area of Science:
- Neuroscience
- Biochemistry
- Pharmacology
Background:
- Epilepsy affects over 65 million globally, often initiated by neurological insults like status epilepticus.
- Oxidative stress and reactive oxygen species (ROS) are key factors in acquired epilepsy.
- Upregulating nuclear factor erythroid 2-related factor 2 (Nrf2) enhances antioxidant defenses and neuroprotection.
Purpose of the Study:
- To evaluate the neuroprotective effects of sulforaphane, a natural Nrf2 activator.
- To investigate sulforaphane's efficacy in in vitro and in vivo epilepsy models.
Main Methods:
- Utilized an in vitro epileptiform activity model and a temporal lobe epilepsy rat model.
- Administered sulforaphane following kainic acid-induced status epilepticus in rats.
- Assessed ROS generation, glutathione levels, Nrf2 expression, oxidative stress markers, and neuronal cell death.
Main Results:
- Sulforaphane decreased ROS generation and restored glutathione levels in vitro.
- In rats, sulforaphane increased Nrf2 expression and antioxidant capacity.
- Sulforaphane significantly reduced neuronal cell death induced by status epilepticus.
Conclusions:
- Nrf2 activation by sulforaphane exerts neuroprotection against brain insults.
- Sulforaphane enhances antioxidant capacity and reduces neuronal death in epilepsy.
- This suggests sulforaphane may be a therapeutic strategy to modify epilepsy development.
