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Updated: May 13, 2026
Photothrombotic Ischemia: A Minimally Invasive and Reproducible Photochemical Cortical Lesion Model for Mouse Stroke Studies
Published on: June 9, 2013
Increased susceptibility to pentetrazol-induced seizures in developing rats after cortical photothrombotic ischemic
1Department of Developmental Epileptology, Institute of Physiology, Academy of Sciences of the Czech Republic, Vídeňská 1083, CZ-142 20 Prague 4, Czech Republic.
Insights
Perinatal stroke in developing rats alters seizure susceptibility. Early cortical lesions increased seizure risk and duration, impacting brain development and epilepsy risk.
Area of Science:
- Neuroscience
- Developmental Neuroscience
- Cerebrovascular Research
Background:
- Perinatal stroke affects 1 in 4000 births, often leading to epilepsy.
- Understanding seizure susceptibility after early brain injury is crucial for developing treatments.
Purpose of the Study:
- To investigate seizure susceptibility in developing rats with sensorimotor cortex lesions.
- To analyze the impact of early cortical ischemia on PTZ-induced seizure models.
Main Methods:
- Photothrombotic lesions were induced in rat pups at postnatal day 7.
- Lesioned and control rats were tested for pentylenetetrazol (PTZ)-induced seizures at postnatal days 12 and 25.
- Seizure occurrence, latency, and severity were assessed, along with EEG analysis.
Main Results:
- A decreased latency for generalized seizures was observed in lesioned rats at postnatal day 12.
- EEG studies at postnatal day 25 revealed longer latencies and durations of rhythmic episodes in lesioned rats.
- A higher incidence of clonic seizures occurred in lesioned rats after PTZ administration.
Conclusions:
- Early cortical ischemic lesions differentially affect susceptibility to various PTZ-induced seizure types.
- Developmental stroke can alter long-term seizure susceptibility and brain network function.
Abstract:
Perinatal stroke is a common cerebrovascular disorder affecting 1 in every 4000 births; typically associated with epilepsy. We sought to determine seizure susceptibility to pentylentetrazol (PTZ)-induced seizures in developing rats with a history of photothrombotic lesion of sensorimotor cortex induced at postnatal day 7. Lesioned animals were tested at P12 or P25 and compared with sham-operated controls. Three models of epileptic seizures were elicited by PTZ: episodes of spike-and-wave rhythm, minimal clonic seizures and generalized tonic-clonic seizures. PTZ (60 and 100 mg/kg) was administered subcutaneously to assess seizure occurrence, latency and severity. In addition, episodes of rhythmic EEG activity were analyzed at P25 following successive interperitoneal 20 and 40 mg/kg PTZ administration. There was only one significant change in convulsive seizures--decreased latency of generalized seizures in lesioned 12-day-old animals. EEG study demonstrated marked difference between lesioned and control rats. Lesioned rats had longer latencies and longer durations of the first rhythmic episode (following 20 mg/kg PTZ) as compared to controls. After 40 mg/kg of PTZ, 7 in 8 leisioned and 1 in 8 control rats exhibited clonic seizures. Cortical ischemic lesion during early development affected differently the susceptibility of rat's brain to three types of PTZ-induced seizures 5 and 18 days post photothrombotic insults.
