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

eLife

Marco Leite¹  Vincent Magloire¹  Jonathan H Cornford¹  Marion S Mercier¹  Dimitri M Kullmann¹  Michael Häusser² 

[1] UCL Queen Square Institute of Neurology, University College London, London, United Kingdom;Wolfson Institute for Biomedical Research, University College London, London, United Kingdom;

关键词: interneurons;    dendrites;    computation;    oscillations;    hippocampus;   

DOI  :  10.7554/eLife.49872

来源: DOAJ

【 摘 要 】

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.

【 授权许可】

Unknown