Cited by 459Neuroscience and Neuropharmacology ResearchNeural dynamics and brain functionVisual perception and processing mechanisms

Pathway-Specific Feedforward Circuits between Thalamus and Neocortex Revealed by Selective Optical Stimulation of Axons

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Cruikshank, Scott J., Urabe, Hayato, Nurmikko, Arto V., Connors, Barry W.·2010·Neuron

Abstract

Thalamocortical and corticothalamic pathways mediate bidirectional communication between the thalamus and neocortex. These pathways are entwined, making their study challenging. Here we used lentiviruses to express channelrhodopsin-2 (ChR2), a light-sensitive cation channel, in either thalamocortical or corticothalamic projection cells. Infection occurred only locally, but efferent axons and their terminals expressed ChR2 strongly, allowing selective optical activation of each pathway. Laser stimulation of ChR2-expressing thalamocortical axons/terminals evoked robust synaptic responses in cortical excitatory cells and fast-spiking (FS) inhibitory interneurons, but only weak responses in somatostatin-containing interneurons. Strong FS cell activation led to feedforward inhibition in all cortical neuron types, including FS cells. Corticothalamic stimulation excited thalamic relay cells and inhibitory neurons of the thalamic reticular nucleus (TRN). TRN activation triggered inhibition in relay cells but not in TRN neurons. Thus, a major difference between thalamocortical and corticothalamic processing was the extent to which feedforward inhibitory neurons were themselves engaged by feedforward inhibition.

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Crossref · 10.1016/j.neuron.2009.12.025

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  1. Alger BE 1984 Appendix: Brain Slice Methods Brain Slices Dingledine R New York Plenum Press
  2. Mountcastle VM 1998 Perceptual Neuroscience Harvard University Press

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Authors
Cruikshank, S. J., Urabe, H., Nurmikko, A. V., & Connors, B. W.
Affiliations
Brown University (US)
Corresponding author
Cruikshank, Scott J.
Venue
Neuron
Publisher
Elsevier BV
Published
2010-01
Volume
65
Issue
2
Pages
230-245
ISSN
0896-6273 (ISSN-L)
OpenAlex
W2010975466
Cited by
459
References
63
Citations by year
2026: 11 · 2025: 23 · 2024: 20 · 2023: 23 · 2022: 24 · 2021: 25 · 2020: 28 · 2019: 36 · 2018: 30 · 2017: 27 · 2016: 40 · 2015: 24 · 2014: 30 · 2013: 38 · 2012: 30
FWCI
15.24
Type
journal article
Language
en
Open access
Locations
  • Neuron (publishedVersion)
  • PubMed (publishedVersion)
  • Europe PMC (PubMed Central) (acceptedVersion)
  • PubMed Central (acceptedVersion)
  • OSTI OAI (U.S. Department of Energy Office of Scientific and Technical Information) (submittedVersion)
Funders
  • National Science Foundation (0725740)
  • Brown Institute for Brain Science
  • National Institutes of Health (NS05043, NS25983)
  • U.S. Department of Energy (ER46387)
  • National Institute of Biomedical Imaging and Bioengineering
  • National Center for Medical Rehabilitation Research
  • Eunice Kennedy Shriver National Institute of Child Health and Human Development (1R01EB007401-01)
Topics
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuroscience and Neuropharmacology Research
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Neural dynamics and brain function
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Visual perception and processing mechanisms
Keywords
thalamocortical circuits, corticothalamic pathway, feedforward inhibition, thalamus, neocortex, channelrhodopsin-2, fast-spiking interneurons, somatostatin interneurons, thalamic relay cells, thalamic reticular nucleus, synaptic responses
MeSH terms
Animals, Axons, Lasers, Nerve Net, Neural Inhibition, Thalamus, Signal Transduction, Neocortex, Mice, Optical Phenomena

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