Modeling early-onset post-ischemic seizures in aging mice.

Area of Science:

• Neuroscience
• Gerontology
• Pathology

Background:

• Stroke is a primary cause of seizures and epilepsy in the elderly.
• Post-stroke seizures indicate a poor prognosis, but underlying mechanisms in aging populations are understudied.
• Research on post-stroke seizures in aging animal models is limited.

Purpose of the Study:

• To establish a model for early-onset, convulsive post-stroke seizures in aging mice.
• To investigate the relationship between seizures, brain injury, and survival in aged animals following ischemic stroke.
• To compare seizure characteristics and treatment responses in aging versus adult mice.

Main Methods:

• Middle cerebral artery occlusion (MCAO) model in aging (16-20 months) and adult (6-8 months) C57BL/6 mice.
• Combined behavioral monitoring, electroencephalography (EEG), and histological assessments to evaluate seizure activity and brain injury.
• Administration of anticonvulsant treatments post-seizure to assess efficacy on seizure control and survival.

Main Results:

• Aging mice developed early-onset, vigorous convulsive seizures within hours of MCAO, characterized by specific behaviors without typical EEG discharges.
• Seizure occurrence was strongly correlated with severe brain injury and high acute mortality in aging mice.
• Anticonvulsant therapy provided temporary seizure control but did not enhance survival in aging mice, unlike in adult mice.

Conclusions:

• Early-onset convulsive seizures following acute ischemic stroke in aging animals are a consequence of severe brain injury.
• Aging exacerbates the detrimental effects of post-stroke seizures, leading to poor survival outcomes.
• This study provides a valuable model for investigating age-related mechanisms of post-stroke seizures.