Synaptic Kainate Receptors in CA1 Interneurons Gate the Threshold of Theta-frequency-induced Long-term Potentiation

Overview

Journal J Neurosci

Specialty Neurology

Date 2012 Dec 15

PMID 23238735

Citations 8

Authors

Vernon R J Clarke

Graham L Collingridge

Sari E Lauri

Tomi Taira

Affiliations

Soon will be listed here.

Abstract

Theta oscillations (4-12 Hz) in neuronal networks are known to predispose the synapses involved to plastic changes and may underlie their association with learning behaviors. The lowered threshold for synaptic plasticity during theta oscillations is thought to be due to decreased GABAergic inhibition. Interneuronal kainate receptors (KARs) regulate GABAergic transmission and are implicated in theta activity; however, the physiological significance of this regulation is unknown. In rat hippocampus, we show that during theta activity, there is excitatory postsynaptic drive to CA1 interneurons mediated by KARs. This promotes feedforward inhibition of pyramidal neurons, raising the threshold for induction of theta-burst long-term potentiation. These results identify a novel mechanism whereby the activation of postsynaptic KARs in CA1 interneurons gate changes in synaptic efficacy to a physiologically relevant patterned stimulation.

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