Spread of activity in thick cortical slices

Area of Science:

• Neuroscience
• Epilepsy Research
• Brain Slice Preparation

Background:

• Maintaining viable brain tissue ex vivo is crucial for studying neural activity.
• Thick brain slices offer a more complex model than thinner slices.
• Understanding interhemispheric communication and seizure generation is key to epilepsy research.

Purpose of the Study:

• To establish a viable thick slice preparation of the hamster cerebral cortex.
• To investigate the spread of neural activity across hemispheres in this preparation.
• To explore the induction of seizure-like activity using various convulsants.

Main Methods:

• Preparation of 700-800 micron thick hamster cerebral cortex slices.
• Perfusion of slices with oxygenated cerebrospinal fluid (CSF) at 30 ml/min.
• Stimulation of the corpus callosum and induction of seizure activity with penicillin, pentylinetetrazole, bicuculline, or picrotoxin.

Main Results:

• Hamster cerebral cortex slices of 700-800 micron thickness remained viable under perfusion.
• Stimulation of the corpus callosum induced activity spread across both hemispheres.
• Seizure-like activity was successfully induced by adding specific convulsants to the CSF.

Conclusions:

• The established thick slice preparation is suitable for studying large-scale neural network activity.
• This model provides a platform for investigating mechanisms of interhemispheric communication.
• The preparation allows for the study of epileptiform activity and potential anti-epileptic drug mechanisms.