Spontaneous epileptic rats show changes in sleep architecture and hypothalamic pathology
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Updated: Feb 11, 2026

Assessment of Memory Function in Pilocarpine-induced Epileptic Mice
Published on: June 4, 2020
Jesper F Bastlund1, Poul Jennum, Paul Mohapel
1Department of Neuropharmacology, H. Lundbeck A/S, Valby, Denmark. jfb@lundbeck.com
Purpose:
The goal of the present study was to investigate the relationship between sleep, hypothalamic pathology, and seizures in spontaneous epileptic rats.
Methods:
Rats were implanted with radiotelemetry transmitters for measuring electrocorticogram (ECoG) and stimulation electrodes in the hippocampus. Epileptogenesis was triggered by 2 h of electical stimulation-induced self-sustained status epilepticus (SSSE). After SSSE, ECoGs were monitored over a 15-week period for the occurrence of interictal high-amplitude low-frequency (HALF) acitvity and spontaneous reoccurring seizures (SRSs).
Results:
Spontaneous epileptic rats showed clinical features of temporal lobe epilepsy (TLE), such as spontaneous seizures, interictal activity and neuronal cell loss in the dorsomedial hypothalamus, a region important for normal sleep regulation. Interestingly, epileptic rats showed disturbances in sleep architecture, with a high percentage of the seizures occurring during sleep.
Conclusions:
Therefore we conclude that a close association exists between epileptiform activity and alterations in sleep architecture that may be related to hypothalamic pathology.
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