Dendritic spikes induce ripples in parvalbumin interneurons during hippocampal sharp waves - PubMed (original) (raw)
. 2014 May 21;82(4):908-24.
doi: 10.1016/j.neuron.2014.04.004.
Gergely F Turi 2, Gergely Katona 3, Attila Kaszás 1, Dénes Pálfi 1, Pál Maák 4, Gergely Szalay 3, Mátyás Forián Szabó 5, Gábor Szabó 6, Zoltán Szadai 3, Szabolcs Káli 5, Balázs Rózsa 7
Affiliations
- PMID: 24853946
- DOI: 10.1016/j.neuron.2014.04.004
Free article
Dendritic spikes induce ripples in parvalbumin interneurons during hippocampal sharp waves
Balázs Chiovini et al. Neuron. 2014.
Free article
Erratum in
- Neuron. 2014 Aug 6;83(3):749
Abstract
Sharp-wave ripples are transient oscillatory events in the hippocampus that are associated with the reactivation of neuronal ensembles within specific circuits during memory formation. Fast-spiking, parvalbumin-expressing interneurons (FS-PV INs) are thought to provide fast integration in these oscillatory circuits by suppressing regenerative activity in their dendrites. Here, using fast 3D two-photon imaging and a caged glutamate, we challenge this classical view by demonstrating that FS-PV IN dendrites can generate propagating Ca(2+) spikes during sharp-wave ripples. The spikes originate from dendritic hot spots and are mediated dominantly by L-type Ca(2+) channels. Notably, Ca(2+) spikes were associated with intrinsically generated membrane potential oscillations. These oscillations required the activation of voltage-gated Na(+) channels, had the same frequency as the field potential oscillations associated with sharp-wave ripples, and controlled the phase of action potentials. Furthermore, our results demonstrate that the smallest functional unit that can generate ripple-frequency oscillations is a segment of a dendrite.
Copyright © 2014 Elsevier Inc. All rights reserved.
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