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Insect Sci

Title:		Octopamine modulates the activity of motoneurons related to calling behavior in the gypsy moth Lymantria dispar
Author(s):		Solari P; Sollai G; Masala C; Maccioni R; Crnjar R; Liscia A;
Address:		"Department of Biomedical Sciences, Section of Physiology, University of Cagliari, University Campus, Monserrato, CA, Italy"
Journal Title:		Insect Sci
Year:		2018
Volume:		20180406
Issue:		5
Page Number:		797 - 808
DOI:		10.1111/1744-7917.12580
ISSN/ISBN:		1744-7917 (Electronic) 1672-9609 (Linking)
Abstract:		"A morphofunctional investigation of the different neuronal subpopulations projecting through each of the nerves IV-VI emerging bilaterally from the terminal abdominal ganglion (TAG) was correlated with the octopaminergic activity in the ganglion that controls the ovipositor movements associated with calling behavior in the female gypsy moth Lymantria dispar. Tetramethylrodamine-dextran backfills from nerve stumps resulted in a relatively low number of TAG projections, ranging from 12 to 13 for nerve pair IV, 12 to 14 for nerve pair V, and 8 to 9 for nerve pair VI. Furthermore, as assessed by electrophysiological recordings, a number of fibers within each of these nerves displays spontaneous tonic activity, also when the ganglion is fully disconnected from the ventral nerve cord (VNC). Octopamine (OA) applications to the TAG strongly enhanced the activity of these nerves, either by increasing the firing rate of a number of spontaneously firing units or by recruiting new ones. This octopaminergic activity affected calling behavior, and specifically the muscle activity leading to cycling extensions of the intersegmental membrane (IM) between segments VIII and IX (ovipositor). Our results indicate that in the female gypsy moth the octopaminergic neural activity of the TAG is coupled with extensions and retractions of IM for the purpose of releasing pheromone, where motor units innervated by nerve pair IV appear antagonistic with respect to those innervated by nerve pair V"
Keywords:		*Animal Communication Animals Female Moths/*physiology Motor Neurons/physiology Octopamine/*metabolism Sex Attractants/metabolism electrophysiology morphology muscle contraction neuromodulation terminal abdominal ganglion;
Notes:		"MedlineSolari, Paolo Sollai, Giorgia Masala, Carla Maccioni, Riccardo Crnjar, Roberto Liscia, Anna eng Australia 2018/02/24 Insect Sci. 2018 Oct; 25(5):797-808. doi: 10.1111/1744-7917.12580. Epub 2018 Apr 6"