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The multifaceted role of inhibitory interneurons in the dorsal lateral geniculate nucleus

Published online by Cambridge University Press:  31 August 2017

CHARLES L. COX  and
JOSEPH A. BEATTY
CHARLES L. COX*
Affiliation:
Department of Physiology, Michigan State University, East Lansing, Michigan 48824
JOSEPH A. BEATTY
Affiliation:
Department of Physiology, Michigan State University, East Lansing, Michigan 48824
*
*Address correspondence to: Charles L. Cox, Department of Physiology, Michigan State University, 567 Wilson Road, East Lansing, MI 48824. E-mail: coxclee@msu.edu
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Abstract

Intrinsic interneurons within the dorsal lateral geniculate nucleus (dLGN) provide a feed-forward inhibitory pathway for afferent visual information originating from the retina. These interneurons are unique because in addition to traditional axodendritic output onto thalamocortical neurons, these interneurons have presynaptic dendrites that form dendrodendritic synapses onto thalamocortical neurons as well. These presynaptic dendrites, termed F2 terminals, are tightly coupled to the retinogeniculate afferents that synapse onto thalamocortical relay neurons. Retinogeniculate stimulation of F2 terminals can occur through the activation of ionotropic and/or metabotropic glutamate receptors. The stimulation of ionotropic glutamate receptors can occur with single stimuli and produces a short-lasting inhibition of the thalamocortical neuron. By contrast, activation of metabotropic glutamate receptors requires tetanic activation and results in longer-lasting inhibition in the thalamocortical neuron. The F2 terminals are predominantly localized to the distal dendrites of interneurons, and the excitation and output of F2 terminals can occur independent of somatic activity within the interneuron thereby allowing these F2 terminals to serve as independent processors, giving rise to focal inhibition. By contrast, strong transient depolarizations at the soma can initiate a backpropagating calcium-mediated potential that invades the dendritic arbor activating F2 terminals and leading to a global form of inhibition. These distinct types of output, focal versus global, could play an important role in the temporal and spatial roles of inhibition that in turn impacts thalamocortical information processing.

Keywords

ThalamusInhibitionInterneuronsVision
Type
Review Article
Information
Visual Neuroscience , Volume 34 , 2017 , E017
Copyright
Copyright © Cambridge University Press 2017 

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