Enhanced thalamo-hippocampal synchronization during focal limbic seizures

被引:13
|
作者
Aracri, Patrizia [1 ]
de Curtis, Marco [1 ]
Forcaia, Greta [1 ]
Uva, Laura [1 ]
机构
[1] Fdn Ist Neurol Carlo Besta, Epilepsy Unit, Via Amadeo 42, Milan, Italy
关键词
acute seizure model; focal seizure; invitro guinea pig brain; limbic region; synchronization; thalamus; TEMPORAL-LOBE EPILEPSY; NUCLEUS-REUNIENS-THALAMI; VOXEL-BASED MORPHOMETRY; GUINEA-PIG BRAIN; FUNCTIONAL-ANATOMY; IN-VITRO; DYNAMICS; NETWORK; RAT; CONNECTIVITY;
D O I
10.1111/epi.14521
中图分类号
R74 [神经病学与精神病学];
学科分类号
摘要
ObjectiveThe 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. MethodsRecordings 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. ResultsSpectral 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. SignificanceAs 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.
引用
收藏
页码:1774 / 1784
页数:11
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