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Postsynaptic odorant concentration dependent inhibition controls temporal properties of spike responses of projection neurons in the moth antennal lobe

Autor(en)
Fujiwara, T. ; Kazawa, T. ; Haupt, Stephan ; Kanzaki, R.
Normierter Zeitschriftentitel
PLOS ONE 
DOI
10.1371/journal.pone.0089132
ISSN
1932-6203
PubMed-ID
24586546
URL
https://pub.uni-bielefeld.de/record/2663527
Web of Science-ID
000331711900094

Weitere Details

Sprache
englisch
Darstellungsform
Text
Band
9
Artikelnummer
e89132
Ausgabe
2

Although odorant concentration-response characteristics of olfactory neurons have been widely investigated in a variety of animal species, the effect of odorant concentration on neural processing at circuit level is still poorly understood. Using calcium imaging in the silkmoth (Bombyx mori) pheromone processing circuit of the antennal lobe (AL), we studied the effect of odorant concentration on second-order projection neuron (PN) responses. While PN calcium responses of dendrites showed monotonic increases with odorant concentration, calcium responses of somata showed decreased responses at higher odorant concentrations due to postsynaptic inhibition. Simultaneous calcium imaging and electrophysiology revealed that calcium responses of PN somata but not dendrites reflect spiking activity. Inhibition shortened spike response duration rather than decreasing peak instantaneous spike frequency (ISF). Local interneurons (LNs) that were specifically activated at high odorant concentrations at which PN responses were suppressed are the putative source of inhibition. Our results imply the existence of an intraglomerular mechanism that preserves time resolution in olfactory processing over a wide odorant concentration range.

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