Dendritic NMDA receptors in parvalbumin neurons enable strong and stable neuronal assemblies.

Abstract:

:Parvalbumin-expressing (PV+) GABAergic interneurons mediate feedforward and feedback inhibition and have a key role in gamma oscillations and information processing. The importance of fast synaptic recruitment and action potential initiation and repolarization, and rapid synchronous GABA release by PV+ cells, is well established. In contrast, the functional significance of PV+ cell NMDA receptors (NMDARs), which generate relatively slow postsynaptic currents, is unclear. Underlining their potential importance, several studies implicate PV+ cell NMDAR disruption in impaired network function and circuit pathologies. Here, we show that dendritic NMDARs underlie supralinear integration of feedback excitation from local pyramidal neurons onto mouse CA1 PV+ cells. Furthermore, by incorporating NMDARs at feedback connections onto PV+ cells in spiking networks, we show that these receptors enable cooperative recruitment of PV+ interneurons, strengthening and stabilising principal cell assemblies. Failure of this phenomenon provides a parsimonious explanation for cognitive and sensory gating deficits in pathologies with impaired PV+ NMDAR signalling.

journal_name

Elife

journal_title

eLife

authors

Cornford JH,Mercier MS,Leite M,Magloire V,Häusser M,Kullmann DM

doi

10.7554/eLife.49872

subject

Has Abstract

pub_date

2019-10-28 00:00:00

issn

2050-084X

pii

49872

journal_volume

8

pub_type

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