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Effects of postnatal caffeine exposure on seizure susceptibility in developing rats
Jana Tchekalarova1, Hana Kubová, Pavel Mares
1Institute of Physiology, Acad. G. Bonchev Stir., Bal. 23, Bulgarian Academy of Sciences, Sofia 1113, Bulgaria. jane_tch@yahoo.com
Insights
Early postnatal caffeine exposure in rats reduces seizure susceptibility. This effect varies by seizure type and age, indicating a complex, model-specific impact on developing brain excitability.
Area of Science:
- Neuroscience
- Developmental Biology
- Pharmacology
Background:
- Postnatal caffeine administration is used to treat apnea of prematurity in infants.
- Caffeine's influence on developing brain excitability and seizure susceptibility requires further mechanistic investigation.
- Animal models mimicking infant caffeine treatment are crucial for understanding these effects.
Purpose of the Study:
- To investigate the mechanism of altered seizure susceptibility following early postnatal caffeine exposure in a rat model.
- To assess how caffeine treatment affects susceptibility to various convulsant drugs during development.
- To determine age-specific and drug-specific changes in seizure susceptibility.
Main Methods:
- Rats were administered daily subcutaneous caffeine (10 and/or 20 mg/kg) during postnatal days 7-11.
- Seizure susceptibility was evaluated in 12- and 25-day-old rats using four convulsant drugs: pentetrazol, picrotoxin, bicuculline, and aminophylline.
- Changes in generalized tonic-clonic seizures (GTCS) and minimal clonic seizures were analyzed.
Main Results:
- Early postnatal caffeine treatment reduced overall seizure susceptibility.
- Aminophylline-induced seizures showed the highest sensitivity, while bicuculline-induced seizures exhibited near-complete resistance.
- Age-specific effects were observed: aminophylline and picrotoxin seizures were more affected in younger (12-day-old) rats, whereas pentetrazol seizures were more affected in older (25-day-old) rats.
- Generalized tonic-clonic seizures (GTCS) were more affected than minimal clonic seizures.
Conclusions:
- Repeated early postnatal caffeine treatment attenuates seizure susceptibility during development.
- The observed reduction in seizure susceptibility is specific to the convulsant drug model used.
- These findings highlight the complex, age- and model-dependent neurodevelopmental effects of caffeine.
Abstract:
Postnatal caffeine treatment of rats can influence brain excitability during development. To study the mechanism involved in the alterations of seizure susceptibility, we used an animal model that corresponds to the infants treated with caffeine for apnea of prematurity. Seizure susceptibility to four convulsant drugs (pentetrazol, picrotoxin, bicuculline and aminophylline) was assessed in 12- and 25-day-old rats exposed to caffeine at a daily dose of 10 and/or 20 mg/kg s.c. at postnatal days 7-11. Our results demonstrated that the changes in generalized tonic-clonic seizures (GTCS) are more expressed than changes in minimal clonic seizures. There are marked differences among individual convulsants with the highest sensitivity of aminophylline-induced seizures and nearly complete resistance of bicuculline-induced seizures. The changes in individual models are age specific: aminophylline- and picrotoxin-induced seizures are more affected in 12- than in 25-day-old rats whereas PTZ-induced seizures are more changed by early postnatal caffeine exposure in 25- than in 12-day-old animal. Taken together, repeated caffeine treatment from postnatal day 7 to 11 reduces the seizure susceptibility during development and this reduction is also model specific.
