Enhanced thalamo-hippocampal synchronization during focal limbic seizures

Patrizia Aracri, Marco de Curtis, Greta Forcaia, Laura Uva

Research output: Contribution to journalArticle

Abstract

Objective: The key factors that promote the termination of focal seizures have not been fully clarified. The buildup of neuronal synchronization during seizures has been proposed as one of the possible activity-dependent, self-limiting mechanisms. We investigate if increased thalamo-cortical coupling contributes to enhance synchronization during the late phase of focal seizure-like events (SLEs) generated in limbic regions. Methods: Recordings were simultaneously performed in the nucleus reuniens of the thalamus, in the hippocampus and in the entorhinal cortex of the isolated guinea pig brain during focal bicuculline-induced SLEs with low voltage fast activity at onset. Results: Spectral coherence and cross-correlation analysis demonstrated a progressive thalamo-cortical entrainment and synchronization in the generation of bursting activity that characterizes the final part of SLEs. The hippocampus is the first activated structure at the beginning of SLE bursting phase and thalamo-hippocampal synchronization is progressively enhanced as SLE develops. The thalamus takes the lead in generating the bursting discharge as SLE end approaches. Significance: As suggested by clinical studies performed during pre-surgical intracranial monitoring, our data confirm a role of the midline thalamus in leading the synchronous bursting activity at the end of focal seizures in the mesial temporal regions.

Original languageEnglish
Pages (from-to)1774-1784
Number of pages11
JournalEpilepsia
Volume59
Issue number9
DOIs
Publication statusPublished - Sep 1 2018

Keywords

  • acute seizure model
  • focal seizure
  • in vitro guinea pig brain
  • limbic region
  • synchronization
  • thalamus

ASJC Scopus subject areas

  • Neurology
  • Clinical Neurology

Fingerprint Dive into the research topics of 'Enhanced thalamo-hippocampal synchronization during focal limbic seizures'. Together they form a unique fingerprint.

Cite this