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Audiogenic seizures in curarized mice
Abstract:
Previous experiments have indicated that interference with somatosensory feedback from convulsive movements may lessen the severity of audiogenic seizures in susceptible rodents. For further investigation of this phenomenon, mice were partially immobilized with tubocurarine chloride to attenuate convulsive movements and somatosensory input associated with such movements. In Experiment 1, seizures of mice injected with .15 mg/kg were evaluated behaviorally and compared with seizures of saline-injected litter-mates. The likelihood of clonic-tonic seizures in curarized mice was as high as that of control mice, although convulsive movements were somewhat less violent and seizure fatalities were markedly reduced. In Experiment 2, seizures of mice given .25 mg/kg were evaluated with electroencephalography, and records were compared with those of controls. Despite the near absence of behavioral signs of convulsions, electroencephalograms of curarized mice showed that audiogenic seizures readily occurred. The findings suggest that audiogenic seizures are centrally "programmed" and do not require feedback from convulsive movements. However, it may be possible to disrupt the central "program" by introducing appropriate somatosensory input not normally encountered during audiogenic seizures.
Insights
Audiogenic seizures in mice are centrally programmed and do not require movement feedback. However, disrupting this central program with novel somatosensory input may offer a therapeutic avenue for seizure control.
Area of Science:
- Neuroscience
- Behavioral Neuroscience
- Epilepsy Research
Background:
- Previous studies suggest somatosensory feedback from movements may influence audiogenic seizure severity in rodents.
- Audiogenic seizures are a common experimental model for studying epilepsy.
Purpose of the Study:
- To investigate the role of somatosensory feedback in the manifestation of audiogenic seizures.
- To determine if attenuating convulsive movements affects seizure severity and outcome.
Main Methods:
- Mice were partially immobilized using tubocurarine chloride to reduce convulsive movements and associated somatosensory input.
- Experiment 1: Behavioral evaluation of seizures in mice treated with .15 mg/kg tubocurarine chloride compared to saline controls.
- Experiment 2: Electroencephalography (EEG) assessment of seizures in mice treated with .25 mg/kg tubocurarine chloride compared to controls.
Main Results:
- While tubocurarine chloride reduced convulsive movement intensity and seizure fatalities, the likelihood of clonic-tonic seizures remained high.
- EEG recordings in Experiment 2 showed that audiogenic seizures occurred readily, even with minimal behavioral convulsion signs.
- This indicates that seizures are centrally initiated and do not solely rely on peripheral feedback.
Conclusions:
- Audiogenic seizures appear to be centrally "programmed" and can occur independently of somatosensory feedback from convulsive movements.
- The findings suggest potential for therapeutic intervention by disrupting the central seizure program with non-standard somatosensory stimuli.