Comparing the synaptic potentiation in schaffer collateral-CA1 synapses in dorsal and intermediate regions of the hippocampus in normal and kindled rats.
Field potentials
Hippocampus
Long-term synaptic plasticity
PTZ kindling
Seizure
Short-term synaptic plasticity
Journal
IBRO neuroscience reports
ISSN: 2667-2421
Titre abrégé: IBRO Neurosci Rep
Pays: Netherlands
ID NLM: 101775148
Informations de publication
Date de publication:
Dec 2023
Dec 2023
Historique:
received:
14
07
2023
revised:
26
09
2023
accepted:
30
09
2023
medline:
16
10
2023
pubmed:
16
10
2023
entrez:
16
10
2023
Statut:
epublish
Résumé
There is growing evidence that the hippocampus comprises diverse neural circuits that exhibit longitudinal variation in their properties, however, the intermediate region of the hippocampus has received comparatively little attention. Therefore, this study was designed to compared short- and long-term synaptic plasticity between the dorsal and intermediate regions of the hippocampus in normal and PTZ-kindled rats. Short-term plasticity was assessed by measuring the ratio of field excitatory postsynaptic potentials' (fEPSPs) slope in response to paired-pulse stimulation at three different inter-pulse intervals (20, 80, and 160 ms), while long-term plasticity was assessed using primed burst stimulation (PBS). The results showed that the basal synaptic strength differed between the dorsal and intermediate regions of the hippocampus in both control and kindled rats. In the control group, paired-pulse stimulation of Schaffer collaterals resulted in a significantly lower fEPSP slope in the intermediate part of the hippocampus compared to the dorsal region. Additionally, the magnitude of long-term potentiation (LTP) was significantly lower in the intermediate part of the hippocampus compared to the dorsal region. In PTZ-kindled rats, both short-term facilitation and long-term potentiation were impaired in both regions of the hippocampus. Interestingly, there was no significant difference in synaptic plasticity between the dorsal and intermediate regions in PTZ-kindled rats, despite impairments in both regions. This suggests that seizures eliminate the regional difference between the dorsal and intermediate parts of the hippocampus, resulting in similar electrophysiological activity in both regions in kindled animals. Future studies should consider this when investigating the responses of the dorsal and intermediate regions of the hippocampus following PTZ kindling.
Identifiants
pubmed: 37841086
doi: 10.1016/j.ibneur.2023.09.010
pii: S2667-2421(23)02267-4
pmc: PMC10570600
doi:
Types de publication
Journal Article
Langues
eng
Pagination
252-261Informations de copyright
© 2023 The Authors.
Déclaration de conflit d'intérêts
The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
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