Abstract:
OBJECTIVE:Development of novel therapies for temporal lobe epilepsy is hindered by a lack of models suitable for drug screening. While testing the hypothesis that "inhibiting inhibitory neurons" was sufficient to induce seizures, it was discovered that a mild electrical kindling protocol of VGAT-Cre mice led to spontaneous motor and electrographic seizures. This study characterizes these seizures and investigates the mechanism. METHODS:Mice were implanted with electroencephalographic (EEG) headsets that included a stimulating electrode in the hippocampus before being electrically kindled. Seizures were evaluated by review of EEG recordings and behavior. γ-Aminobutyric acidergic (GABAergic) neurotransmission was evaluated by quantitative polymerase chain reaction, immunocytochemistry, Western blot, and electrophysiology. RESULTS:Electrical kindling of VGAT-Cre mice induces spontaneous recurring seizures after a short latency (6 days). Seizures occur 1-2 times per day in both male and female mice, with only minimal neuronal death. These mice express Cre recombinase under the control of the vesicular GABA transporter (VGAT), a gene that is specifically expressed in GABAergic inhibitory neurons. The insertion of Cre disrupts the expression of VGAT mRNA and protein, and impairs GABAergic synaptic transmission in the hippocampus. SIGNIFICANCE:Kindled VGAT-Cre mice can be used to study the mechanisms involved in epileptogenesis and may be useful for screening novel therapeutics.
journal_name
Epilepsiajournal_title
Epilepsiaauthors
Straub J,Gawda A,Ravichandran P,McGrew B,Nylund E,Kang J,Burke C,Vitko I,Scott M,Williamson J,Joshi S,Kapur J,Perez-Reyes Edoi
10.1111/epi.16651subject
Has Abstractpub_date
2020-10-01 00:00:00pages
2277-2288issue
10eissn
0013-9580issn
1528-1167journal_volume
61pub_type
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