The hippocampal CA3 region can generate two distinct types of sharp wave-ripple complexes, in vitro.
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Tartalom: http://real.mtak.hu/18884/
Archívum: MTA Könyvtár
Gyűjtemény: Status = Published


Type = Article
Cím:
The hippocampal CA3 region can generate two distinct types of sharp wave-ripple complexes, in vitro.
Létrehozó:
Hofer, Katharina
Kandracs, A.
Ulbert, István
Pál, Ildikó
Szabo, Cs.
Héja, László
Wittner, Lucia
Kiadó:
Wiley
Dátum:
2015
Téma:
RC0321 Neuroscience. Biological psychiatry. Neuropsychiatry / idegkórtan, neurológia, pszichiátria
RZ Other systems of medicine / orvostudomány egyéb területei
Tartalmi leírás:
Hippocampal sharp wave-ripples (SPW-Rs) occur during slow wave sleep and behavioral immobility and are thought to play an important role in memory formation. We investigated the cellular and network properties of SPW-Rs with simultaneous laminar multielectrode and intracellular recordings in a rat hippocampal slice model, using physiological bathing medium. Spontaneous SPW-Rs were generated in the dentate gyrus (DG), CA3 and CA1 regions. These events were characterized by a local field potential gradient (LFPg) transient, increased fast oscillatory activity and increased multiple unit activity (MUA). Two types of SPW-Rs were distinguished in the CA3 region based on their different LFPg and current source density (CSD) pattern. Type 1 (T1) displayed negative LFPg transient in the pyramidal cell layer, and the associated CSD sink was confined to the proximal dendrites. Type 2 (T2) SPW-Rs were characterized by positive LFPg transient in the cell layer, and showed CSD sinks involving both the apical and basal dendrites. In both types, consistent with the somatic CSD source, only a small subset of CA3 pyramidal cells fired, most pyramidal cells were hyperpolarized, while most interneurons increased firing rate before the LFPg peak. Different neuronal populations, with different proportions of pyramidal cells and distinct subsets of interneurons were activated during T1 and T2 SPW-Rs. Activation of specific inhibitory cell subsets - with the possible leading role of perisomatic interneurons - seems to be crucial to synchronize distinct ensembles of CA3 pyramidal cells finally resulting in the expression of different SPW-R activities. This suggests that the hippocampus can generate dynamic changes in its activity stemming from the same excitatory and inhibitory circuits, and so, might provide the cellular and network basis for an input-specific and activity-dependent information transmission. (c) 2014 Wiley Periodicals, Inc.
Nyelv:
angol
Típus:
Article
PeerReviewed
info:eu-repo/semantics/article
Formátum:
text
Azonosító:
Hofer, Katharina and Kandracs, A. and Ulbert, István and Pál, Ildikó and Szabo, Cs. and Héja, László and Wittner, Lucia (2015) The hippocampal CA3 region can generate two distinct types of sharp wave-ripple complexes, in vitro. HIPPOCAMPUS, 25 (2). pp. 169-186. ISSN 1050-9631
Kapcsolat:
MTMT:2743439; doi:10.1002/hipo.22361