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Octopamine modulates the activity of motoneurons related to calling behavior in the gypsy moth Lymantria dispar

Insect Science 2018年第5期25卷 797-808页

作者： Paolo Solari Giorgia Sollai carla masala Riccardo Maccioni Roberto Crnjar Anna Liscia Department of Biomedical Sciences Section of Physiology University of Cagliari University Campus Monserrato CA Italy

A morphofunctional investigation of the different neuronal subpopulations projecting through each of the nerves IV-VI emerging bilaterally from the terminal ab- dominal ganglion （TAG） was correlated with the octopaminergic activity in the ganglion that controls the ovipositor movements associated with caUing 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 activ- ity 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 ex- tensions and retractions oflM 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.

关键词： electrophysiology morphology muscle contraction neuromodulation terminal abdominal ganglion

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