Orchestration of Hippocampal Information Encoding by the Piriform Cortex.
dentate gyrus
hippocampus
in vivo
olfactory system
rodent
synaptic plasticity
Journal
Cerebral cortex (New York, N.Y. : 1991)
ISSN: 1460-2199
Titre abrégé: Cereb Cortex
Pays: United States
ID NLM: 9110718
Informations de publication
Date de publication:
10 01 2020
10 01 2020
Historique:
received:
21
12
2018
revised:
08
03
2019
accepted:
18
03
2019
pubmed:
21
6
2019
medline:
23
3
2021
entrez:
21
6
2019
Statut:
ppublish
Résumé
The hippocampus utilizes olfactospatial information to encode sensory experience by means of synaptic plasticity. Odor exposure is also a potent impetus for hippocampus-dependent memory retrieval. Here, we explored to what extent the piriform cortex directly impacts upon hippocampal information processing and storage. In behaving rats, test-pulse stimulation of the anterior piriform cortex (aPC) evoked field potentials in the dentate gyrus (DG). Patterned stimulation of the aPC triggered both long-term potentiation (LTP > 24 h) and short-term depression (STD), in a frequency-dependent manner. Dual stimulation of the aPC and perforant path demonstrated subordination of the aPC response, which was nonetheless completely distinct in profile to perforant path-induced DG plasticity. Correspondingly, patterned aPC stimulation resulted in somatic immediate early gene expression in the DG that did not overlap with responses elicited by perforant path stimulation. Our results support that the piriform cortex engages in specific control of hippocampal information processing and encoding. This process may underlie the unique role of olfactory cues in information encoding and retrieval of hippocampus-dependent associative memories.
Identifiants
pubmed: 31220213
pii: 5432339
doi: 10.1093/cercor/bhz077
pmc: PMC7029697
doi:
Types de publication
Journal Article
Research Support, Non-U.S. Gov't
Langues
eng
Sous-ensembles de citation
IM
Pagination
135-147Informations de copyright
© The Author(s) 2019. Published by Oxford University Press.
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