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Nat Neurosci. 2015 Sep;18(9):1281-1290. doi: 10.1038/nn.4074. Epub 2015 Jul 27.

Determinants of different deep and superficial CA1 pyramidal cell dynamics during sharp-wave ripples.

Author information

1
Instituto Cajal, Consejo Superior de Investigaciones Científicas, Madrid, Spain.
2
Hungarian Academy of Sciences, University of Szeged Research Group for Cortical Microcircuits, Department of Physiology, Anatomy and Neuroscience, University of Szeged, Szeged, Hungary.
3
Hospital Nacional de Parapléjicos, Servicio de Salud de Castilla-La Mancha, Toledo, Spain.
4
Departamento de Fisiología, Facultad de Medicina, Universidad Complutense, Madrid, Spain.
5
Medical Research Council Brain Network Dynamics Unit, Department of Pharmacology, University of Oxford, Oxford, UK.
#
Contributed equally

Abstract

Sharp-wave ripples represent a prominent synchronous activity pattern in the mammalian hippocampus during sleep and immobility. GABAergic interneuronal types are silenced or fire during these events, but the mechanism of pyramidal cell (PC) participation remains elusive. We found opposite membrane polarization of deep (closer to stratum oriens) and superficial (closer to stratum radiatum) rat CA1 PCs during sharp-wave ripples. Using sharp and multi-site recordings in combination with neurochemical profiling, we observed a predominant inhibitory drive of deep calbindin (CB)-immunonegative PCs that contrasts with a prominent depolarization of superficial CB-immunopositive PCs. Biased contribution of perisomatic GABAergic inputs, together with suppression of CA2 PCs, may explain the selection of CA1 PCs during sharp-wave ripples. A deep-superficial gradient interacted with behavioral and spatial effects to determine cell participation during sleep and awake sharp-wave ripples in freely moving rats. Thus, the firing dynamics of hippocampal PCs are exquisitely controlled at subcellular and microcircuit levels in a cell type-selective manner.

PMID:
26214372
PMCID:
PMC4820637
DOI:
10.1038/nn.4074
[Indexed for MEDLINE]
Free PMC Article

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