GABAergic inhibition reduces the impact of synaptic excitation on somatic excitation

Chiaki Kobayashi, Kazuki Okamoto, Yasuhiro Mochizuki, Hidetoshi Urakubo, Kenta Funayama, Tomoe Ishikawa, Tetsuhiko Kashima, Ayako Ouchi, Agnieszka F. Szymanska, Shin Ishii, Yuji Ikegaya

Research output: Contribution to journalArticle

Abstract

The effect of excitatory synaptic input on the excitation of the cell body is believed to vary depending on where and when the synaptic activation occurs in dendritic trees and the spatiotemporal modulation by inhibitory synaptic input. However, few studies have examined how individual synaptic inputs influence the excitability of the cell body in spontaneously active neuronal networks mainly because of the lack of an appropriate method. We developed a calcium imaging technique that monitors synaptic inputs to hundreds of spines from a single neuron with millisecond resolution in combination with whole-cell patch-clamp recordings of somatic excitation. In rat hippocampal CA3 pyramidal neurons ex vivo, a fraction of the excitatory synaptic inputs were not detectable in the cell body against background noise. These synaptic inputs partially restored their somatic impact when a GABAA receptor blocker was intracellularly perfused. Thus, GABAergic inhibition reduces the influence of some excitatory synaptic inputs on the somatic excitability. Numerical simulation using a single neuron model demonstrates that the timing and locus of a dendritic GABAergic input are critical to exert this effect. Moreover, logistic regression analyses suggest that the GABAergic inputs sectionalize spine activity; that is, only some subsets of synchronous synaptic activity seemed to be preferably passed to the cell body. Thus, dendrites actively sift inputs from specific presynaptic cell assemblies.

Original languageEnglish
JournalNeuroscience Research
DOIs
Publication statusAccepted/In press - 2018 Jan 1
Externally publishedYes

Fingerprint

Spine
Neurons
Pyramidal Cells
GABA-A Receptors
Dendrites
Noise
Logistic Models
Regression Analysis
Calcium
Cell Body

Keywords

  • Calcium imaging
  • Dendrite
  • Neuron
  • Patch-clamp recording
  • Spine
  • Synapse

ASJC Scopus subject areas

  • Neuroscience(all)

Cite this

Kobayashi, C., Okamoto, K., Mochizuki, Y., Urakubo, H., Funayama, K., Ishikawa, T., ... Ikegaya, Y. (Accepted/In press). GABAergic inhibition reduces the impact of synaptic excitation on somatic excitation. Neuroscience Research. https://doi.org/10.1016/j.neures.2018.09.014

GABAergic inhibition reduces the impact of synaptic excitation on somatic excitation. / Kobayashi, Chiaki; Okamoto, Kazuki; Mochizuki, Yasuhiro; Urakubo, Hidetoshi; Funayama, Kenta; Ishikawa, Tomoe; Kashima, Tetsuhiko; Ouchi, Ayako; Szymanska, Agnieszka F.; Ishii, Shin; Ikegaya, Yuji.

In: Neuroscience Research, 01.01.2018.

Research output: Contribution to journalArticle

Kobayashi, C, Okamoto, K, Mochizuki, Y, Urakubo, H, Funayama, K, Ishikawa, T, Kashima, T, Ouchi, A, Szymanska, AF, Ishii, S & Ikegaya, Y 2018, 'GABAergic inhibition reduces the impact of synaptic excitation on somatic excitation', Neuroscience Research. https://doi.org/10.1016/j.neures.2018.09.014
Kobayashi, Chiaki ; Okamoto, Kazuki ; Mochizuki, Yasuhiro ; Urakubo, Hidetoshi ; Funayama, Kenta ; Ishikawa, Tomoe ; Kashima, Tetsuhiko ; Ouchi, Ayako ; Szymanska, Agnieszka F. ; Ishii, Shin ; Ikegaya, Yuji. / GABAergic inhibition reduces the impact of synaptic excitation on somatic excitation. In: Neuroscience Research. 2018.
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