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PLoS One

Title:		Postsynaptic odorant concentration dependent inhibition controls temporal properties of spike responses of projection neurons in the moth antennal lobe
Author(s):		Fujiwara T; Kazawa T; Haupt SS; Kanzaki R;
Address:		"Graduate School of Information Science and Technology, The University of Tokyo, Tokyo, Japan. Research Center for Advanced Science and Technology, The University of Tokyo, Tokyo, Japan. Graduate School of Information Science and Technology, The University of Tokyo, Tokyo, Japan ; Research Center for Advanced Science and Technology, The University of Tokyo, Tokyo, Japan"
Journal Title:		PLoS One
Year:		2014
Volume:		20140219
Issue:		2
Page Number:		e89132 -
DOI:		10.1371/journal.pone.0089132
ISSN/ISBN:		1932-6203 (Electronic) 1932-6203 (Linking)
Abstract:		"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"
Keywords:		"Animals Arthropod Antennae/*innervation *Bombyx Calcium/metabolism Male Nerve Net/metabolism Neural Inhibition/*physiology *Odorants Olfactory Cortex/cytology/physiology Olfactory Pathways/physiology Olfactory Receptor Neurons/*metabolism Receptors, Odora;"
Notes:		"MedlineFujiwara, Terufumi Kazawa, Tomoki Haupt, Stephan Shuichi Kanzaki, Ryohei eng Research Support, Non-U.S. Gov't 2014/03/04 PLoS One. 2014 Feb 19; 9(2):e89132. doi: 10.1371/journal.pone.0089132. eCollection 2014"