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Three-dimensional axon morphologies of individual layer 5 neurons indicate cell type-specific intracortical pathways for whisker motion and touch

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Three-dimensional axon morphologies of individual layer 5 neurons indicate cell type-specific intracortical pathways for whisker motion and touch

Auteurs : Marcel Oberlaender [États-Unis] ; Zimbo S. R. M. Boudewijns [Pays-Bas] ; Tatjana Kleele [Allemagne] ; Huibert D. Mansvelder [Pays-Bas] ; Bert Sakmann [États-Unis] ; Christiaan P. J. De Kock [Pays-Bas]

Source :

RBID : PMC:3053980

Abstract

The cortical output layer 5 contains two excitatory cell types, slender- and thick-tufted neurons. In rat vibrissal cortex, slender-tufted neurons carry motion and phase information during active whisking, but remain inactive after passive whisker touch. In contrast, thick-tufted neurons reliably increase spiking preferably after passive touch. By reconstructing the 3D patterns of intracortical axon projections from individual slender- and thick-tufted neurons, filled in vivo with biocytin, we were able to identify cell type-specific intracortical circuits that may encode whisker motion and touch. Individual slender-tufted neurons showed elaborate and dense innervation of supragranular layers of large portions of the vibrissal area (total length, 86.8 ± 5.5 mm). During active whisking, these long-range projections may modulate and phase-lock the membrane potential of dendrites in layers 2 and 3 to the whisking cycle. Thick-tufted neurons with soma locations intermingling with those of slender-tufted ones display less dense intracortical axon projections (total length, 31.6 ± 14.3 mm) that are primarily confined to infragranular layers. Based on anatomical reconstructions and previous measurements of spiking, we put forward the hypothesis that thick-tufted neurons in rat vibrissal cortex receive input of whisker motion from slender-tufted neurons onto their apical tuft dendrites and input of whisker touch from thalamic neurons onto their basal dendrites. During tactile-driven behavior, such as object location, near-coincident input from these two pathways may result in increased spiking activity of thick-tufted neurons and thus enhanced signaling to their subcortical targets.


Url:
DOI: 10.1073/pnas.1100647108
PubMed: 21368112
PubMed Central: 3053980

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<p>The cortical output layer 5 contains two excitatory cell types, slender- and thick-tufted neurons. In rat vibrissal cortex, slender-tufted neurons carry motion and phase information during active whisking, but remain inactive after passive whisker touch. In contrast, thick-tufted neurons reliably increase spiking preferably after passive touch. By reconstructing the 3D patterns of intracortical axon projections from individual slender- and thick-tufted neurons, filled in vivo with biocytin, we were able to identify cell type-specific intracortical circuits that may encode whisker motion and touch. Individual slender-tufted neurons showed elaborate and dense innervation of supragranular layers of large portions of the vibrissal area (total length, 86.8 ± 5.5 mm). During active whisking, these long-range projections may modulate and phase-lock the membrane potential of dendrites in layers 2 and 3 to the whisking cycle. Thick-tufted neurons with soma locations intermingling with those of slender-tufted ones display less dense intracortical axon projections (total length, 31.6 ± 14.3 mm) that are primarily confined to infragranular layers. Based on anatomical reconstructions and previous measurements of spiking, we put forward the hypothesis that thick-tufted neurons in rat vibrissal cortex receive input of whisker motion from slender-tufted neurons onto their apical tuft dendrites and input of whisker touch from thalamic neurons onto their basal dendrites. During tactile-driven behavior, such as object location, near-coincident input from these two pathways may result in increased spiking activity of thick-tufted neurons and thus enhanced signaling to their subcortical targets.</p>
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<journal-id journal-id-type="hwp">pnas</journal-id>
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<article-title>Three-dimensional axon morphologies of individual layer 5 neurons indicate cell type-specific intracortical pathways for whisker motion and touch</article-title>
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<contrib-group>
<contrib contrib-type="author">
<name>
<surname>Oberlaender</surname>
<given-names>Marcel</given-names>
</name>
<xref ref-type="aff" rid="aff1">
<sup>a</sup>
</xref>
<xref ref-type="corresp" rid="cor1">
<sup>1</sup>
</xref>
</contrib>
<contrib contrib-type="author">
<name>
<surname>Boudewijns</surname>
<given-names>Zimbo S. R. M.</given-names>
</name>
<xref ref-type="aff" rid="aff2">
<sup>b</sup>
</xref>
</contrib>
<contrib contrib-type="author">
<name>
<surname>Kleele</surname>
<given-names>Tatjana</given-names>
</name>
<xref ref-type="aff" rid="aff3">
<sup>c</sup>
</xref>
</contrib>
<contrib contrib-type="author">
<name>
<surname>Mansvelder</surname>
<given-names>Huibert D.</given-names>
</name>
<xref ref-type="aff" rid="aff2">
<sup>b</sup>
</xref>
</contrib>
<contrib contrib-type="author">
<name>
<surname>Sakmann</surname>
<given-names>Bert</given-names>
</name>
<xref ref-type="aff" rid="aff1">
<sup>a</sup>
</xref>
<xref ref-type="corresp" rid="cor1">
<sup>1</sup>
</xref>
</contrib>
<contrib contrib-type="author">
<name>
<surname>de Kock</surname>
<given-names>Christiaan P. J.</given-names>
</name>
<xref ref-type="aff" rid="aff2">
<sup>b</sup>
</xref>
<xref ref-type="corresp" rid="cor1">
<sup>1</sup>
</xref>
</contrib>
<aff id="aff1">
<sup>a</sup>
Digital Neuroanatomy,
<institution>Max Planck Florida Institute</institution>
, Jupiter, FL 33458-2906;</aff>
<aff id="aff2">
<sup>b</sup>
Center for Neurogenomics and Cognitive Research, Neuroscience Campus Amsterdam,
<institution>Vrije Universiteit Amsterdam</institution>
, NL-1087 HV, Amsterdam,
<country>The Netherlands</country>
; and</aff>
<aff id="aff3">
<sup>c</sup>
Institute of Neuroscience,
<institution>Technical University Munich</institution>
, D-80802 Munich,
<country>Germany</country>
</aff>
</contrib-group>
<author-notes>
<corresp id="cor1">
<sup>1</sup>
To whom correspondence may be addressed. E-mail:
<email>marcel.oberlaender@maxplanckflorida.org</email>
,
<email>bert.sakmann@maxplanckflorida.org</email>
, or
<email>christiaan.de.kock@cncr.vu.nl</email>
.</corresp>
<fn fn-type="edited-by">
<p>Contributed by Bert Sakmann, January 19, 2011 (sent for review November 20, 2010)</p>
</fn>
<fn fn-type="con">
<p>Author contributions: M.O., B.S., and C.P.J.d.K. designed research; M.O., Z.S.R.M.B., T.K., and C.P.J.d.K. performed research; M.O. designed new analytic tools; M.O., Z.S.R.M.B., H.D.M., B.S., and C.P.J.d.K. analyzed data; and M.O., Z.S.R.M.B., H.D.M., B.S., and C.P.J.d.K. wrote the paper.</p>
</fn>
</author-notes>
<pub-date pub-type="ppub">
<day>8</day>
<month>3</month>
<year>2011</year>
</pub-date>
<pub-date pub-type="epub">
<day>22</day>
<month>2</month>
<year>2011</year>
</pub-date>
<pub-date pub-type="pmc-release">
<day>22</day>
<month>2</month>
<year>2011</year>
</pub-date>
<pmc-comment> PMC Release delay is 0 months and 0 days and was based on the . </pmc-comment>
<volume>108</volume>
<issue>10</issue>
<fpage>4188</fpage>
<lpage>4193</lpage>
<permissions>
<license license-type="open-access">
<license-p>Freely available online through the PNAS open access option.</license-p>
</license>
</permissions>
<self-uri xlink:title="pdf" xlink:type="simple" xlink:href="pnas.201100647.pdf"></self-uri>
<abstract>
<p>The cortical output layer 5 contains two excitatory cell types, slender- and thick-tufted neurons. In rat vibrissal cortex, slender-tufted neurons carry motion and phase information during active whisking, but remain inactive after passive whisker touch. In contrast, thick-tufted neurons reliably increase spiking preferably after passive touch. By reconstructing the 3D patterns of intracortical axon projections from individual slender- and thick-tufted neurons, filled in vivo with biocytin, we were able to identify cell type-specific intracortical circuits that may encode whisker motion and touch. Individual slender-tufted neurons showed elaborate and dense innervation of supragranular layers of large portions of the vibrissal area (total length, 86.8 ± 5.5 mm). During active whisking, these long-range projections may modulate and phase-lock the membrane potential of dendrites in layers 2 and 3 to the whisking cycle. Thick-tufted neurons with soma locations intermingling with those of slender-tufted ones display less dense intracortical axon projections (total length, 31.6 ± 14.3 mm) that are primarily confined to infragranular layers. Based on anatomical reconstructions and previous measurements of spiking, we put forward the hypothesis that thick-tufted neurons in rat vibrissal cortex receive input of whisker motion from slender-tufted neurons onto their apical tuft dendrites and input of whisker touch from thalamic neurons onto their basal dendrites. During tactile-driven behavior, such as object location, near-coincident input from these two pathways may result in increased spiking activity of thick-tufted neurons and thus enhanced signaling to their subcortical targets.</p>
</abstract>
<kwd-group>
<kwd>axon reconstruction</kwd>
<kwd>barrel cortex</kwd>
<kwd>dysgranular zone</kwd>
</kwd-group>
</article-meta>
</front>
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