Related Experiment Video
Updated: Jun 8, 2026
Preparation of Acute Human Hippocampal Slices for Electrophysiological Recordings
Published on: May 7, 2020
Effect of low Mg2+ and bicuculline on cell survival in hippocampal slice cultures
Jinny J Yoon1, Colin R Green, Ji-Zhong Bai
1Department of Ophthalmology, University of Auckland, Auckland, New Zealand. j.yoon@auckland.ac.nz
Abstract:
A reliable model system of epileptiform insult would facilitate investigation into the underlying biological mechanisms. Epileptiform insult was induced in hippocampal slice cultures by lowering extracellular Mg(2+), (+)-bicuculline, or (-)-bicuculline methochloride, a stable salt form of bicuculline (both forms block GABA(A) receptors). Cell death was assessed by propidium iodide uptake. Low Mg(2+) or (+)-bicuculline did not produce cell death regardless of dose or incubation period. Exposure to 100 microM (-)-bicuculline methochloride for 48 hr resulted in prominent CA1 cell death. These findings demonstrate that not all pro-epileptic drugs/ion changes used routinely for electrophysiological recording of seizure activity lead to cell death in hippocampal slice cultures and that treatment with bicuculline methochloride can be used as a reliable model for epileptiform insult.
Insights
Developing a reliable model for epileptiform insult is crucial for understanding epilepsy. Bicuculline methochloride reliably induced cell death in hippocampal slice cultures, establishing it as a viable model.
Area of Science:
- Neuroscience
- Epilepsy Research
- Cell Biology
Background:
- Investigating the biological mechanisms of epilepsy requires reliable experimental models.
- Existing methods for inducing epileptiform activity in hippocampal slice cultures vary in their ability to cause neuronal damage.
Purpose of the Study:
- To evaluate the efficacy of different agents in creating a reliable model of epileptiform insult in hippocampal slice cultures.
- To determine if specific pro-epileptic treatments lead to neuronal cell death.
Main Methods:
- Hippocampal slice cultures were subjected to epileptiform insult using low extracellular Mg(2+), (+)-bicuculline, or (-)-bicuculline methochloride.
- Neuronal cell death was quantified using propidium iodide uptake assays.
- Incubation periods and drug concentrations were varied to assess dose- and time-dependency.
Main Results:
- Low Mg(2+) and (+)-bicuculline did not induce significant cell death, even at high doses or prolonged incubation.
- Exposure to 100 microM (-)-bicuculline methochloride for 48 hours resulted in substantial CA1 cell death.
- This indicates differential neurotoxic effects among common epileptiform insult induction methods.
Conclusions:
- Not all methods used to induce epileptiform activity in hippocampal slice cultures result in neuronal cell death.
- (-)-Bicuculline methochloride serves as a reliable agent for modeling epileptiform insult-induced cell death in hippocampal slice cultures.
- This model system facilitates the study of biological mechanisms underlying neuronal damage during seizures.
