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          Institute: MPI für medizinische Forschung     Collection: Kortikale Zwei - Photonen - Bildgebungsverfahren     Display Documents

ID: 566040.0, MPI für medizinische Forschung / Kortikale Zwei - Photonen - Bildgebungsverfahren
Dendritic spikes in apical dendrites of neocortical layer 2/3 pyramidal neurons
Translation of Title:Dendritic spikes in apical dendrites of neocortical layer 2/3 pyramidal neurons
Authors:Larkum, Matthew E.; Waters, David Jack; Sakmann, Bert; Helmchen, Fritjof
Date of Publication (YYYY-MM-DD):2007-08-22
Title of Journal:Journal of Neuroscience
Journal Abbrev.:J. Neurosci.
Issue / Number:34
Start Page:8999
End Page:9008
Review Status:Peer-review
Audience:Experts Only
Intended Educational Use:No
Abstract / Description:Layer 2/3 (L2/3) pyramidal neurons are the most abundant cells of the neocortex. Despite their key position in the cortical microcircuit, synaptic integration in dendrites of L2/3 neurons is far less understood than in L5 pyramidal cell dendrites, mainly because of the difficulties in obtaining electrical recordings from thin dendrites. Here we directly measured passive and active properties of the apical dendrites of L2/3 neurons in rat brain slices using dual dendritic−somatic patch−clamp recordings and calcium imaging. Unlike L5 cells, L2/3 dendrites displayed little sag in response to long current pulses, which suggests a low density of Ih in the dendrites and soma. This was also consistent with a slight increase in input resistance with distance from the soma. Brief current injections into the apical dendrite evoked relatively short (half−width 2−4 ms) dendritic spikes that were isolated from the soma for near−threshold currents at sites beyond the middle of the apical dendrite. Regenerative dendritic potentials and large concomitant calcium transients were also elicited by trains of somatic action potentials (APs) above a critical frequency (130 Hz), which was slightly higher than in L5 neurons. Initiation of dendritic spikes was facilitated by backpropagating somatic APs and could cause an additional AP at the soma. As in L5 neurons, we found that distal dendritic calcium transients are sensitive to a long−lasting block by GABAergic inhibition. We conclude that L2/3 pyramidal neurons can generate dendritic spikes, sharing with L5 pyramidal neurons fundamental properties of dendritic excitability and control by inhibition
Free Keywords:neocortex; synaptic; integration; action potential; calcium; coincidence detection
Last Change of the Resource (YYYY-MM-DD):--
External Publication Status:published
Document Type:Article
Communicated by:Wulf Kaiser
Affiliations:MPI für medizinische Forschung/Abteilung Zellphysiologie
MPI für medizinische Forschung/Abteilung Zellphysiologie/Kortikale Schaltkreise
MPI für medizinische Forschung/Abteilung Zellphysiologie/Kortikale Zwei - Photonen - Bildgebungsverfahren
MPI für medizinische Forschung/Abteilung Zellphysiologie/In Vivo - Mikroskopie kortikaler Aktivitäten
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