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Distance-dependent gradient in NMDAR-driven spine calcium signals along tapering dendrites

Research output: Contribution to journalArticlepeer-review

Original languageEnglish
Pages (from-to)1986-1995
JournalProceedings of the National Academy of Sciences of the United States of America
Volume114
Issue number10
Early online date16 Feb 2017
DOIs
Accepted/In press13 Jan 2017
E-pub ahead of print16 Feb 2017
Published7 Mar 2017

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King's Authors

Abstract

Neurons receive a multitude of synaptic inputs along their dendritic arbor, but how this highly heterogeneous population of synaptic compartments is spatially organized remains unclear. By measuring N-methyl-D-aspartic acid receptor (NMDAR)-driven calcium responses in single spines, we provide a spatial map of synaptic calcium signals along dendritic arbors of hippocampal neurons and relate this to measures of synapse structure. We find that quantal NMDAR calcium signals increase in amplitude as they approach a thinning dendritic tip end. Based on a compartmental model of spine calcium dynamics, we propose that this biased distribution in calcium signals is governed by a gradual, distance-dependent decline in spine size, which we visualized using serial block-face scanning electron microscopy. Our data describe a cell-autonomous feature of principal neurons, where tapering dendrites show an inverse distribution of spine size and NMDAR-driven calcium signals along dendritic trees, with important implications for synaptic plasticity rules and spine function.

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