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Bicuculline induced seizures in infant rats: ontogeny of behavioral and electrocortical phenomena
1Department of Neurology, University of Southern California, Los Angeles 90054-0700.
Insights
Bicuculline, a gamma-aminobutyric acid (GABA) antagonist, induced seizures in young rats. This suggests bicuculline is a useful tool for studying epilepsy in early postnatal life.
Area of Science:
- Neuroscience
- Pharmacology
- Developmental Biology
Background:
- Gamma-aminobutyric acid (GABA) is a primary inhibitory neurotransmitter in the central nervous system.
- GABAergic system development is crucial for regulating neuronal excitability and preventing seizures.
- Understanding the effects of GABA antagonists during early development is vital for neurological research.
Purpose of the Study:
- To investigate the effects of bicuculline, a GABA antagonist, on immature rats.
- To correlate behavioral and electrocorticographic (ECoG) seizure activity induced by bicuculline.
- To determine the optimal age for using bicuculline as a convulsant in early-life epilepsy models.
Main Methods:
- Administered bicuculline to 258 immature rats across postnatal days 3-22.
- Monitored and recorded behavioral seizure manifestations.
- Simultaneously performed electrocorticography to assess brain electrical activity during seizures.
Main Results:
- Bicuculline induced both behavioral and electrographic seizures from the third postnatal day onwards.
- The 50% lethal dose (CD50) of bicuculline was lowest around the third postnatal day, indicating maximal sensitivity.
- Immature rats exhibited heightened sensitivity to bicuculline's convulsant effects during the first postnatal week.
Conclusions:
- Bicuculline effectively induces seizures in immature rats, mirroring aspects of epilepsy.
- The early postnatal period, particularly the first week, represents a sensitive window for bicuculline-induced seizures.
- Bicuculline is a potentially valuable convulsant for modeling early-life epilepsy in rat studies.
Abstract:
The effects of bicuculline, a gamma-aminobutyric acid (GABA) antagonist, were investigated in 258 immature rats between the third and 22nd postnatal days. Behavioral and electrocorticographic events were correlated. Bicuculline induced both behavioral and electrographic seizures as early as the third postnatal day, an age when the CD50 for bicuculline was lowest, and therefore the sensitivity to it was the greatest. Bicuculline may thus be a suitable convulsant for epilepsy studies involving rats during the first postnatal week.