Mar 21, 2016

Synaptic Transmission Parallels Neuromodulation in a Central Food-Intake Circuit

BioRxiv : the Preprint Server for Biology
Philipp SchlegelJames W Truman

Abstract

Neuromedin U (NMU) is a potent regulator of food intake and activity in mammals. While some downstream targets of NMU have been localized, connectivity of the neural circuits employing this neuropeptide is largely unknown. In Drosophila , neurons producing the homologous neuropeptide hugin regulate feeding and locomotion in a similar manner and project to structures of the central nervous system analogous to those in which NMU is found. Here, we use EM reconstruction and receptor expression analysis to map the connectome of hugin-producing neurons in the Drosophila larval central nervous system. We show that hugin-producing neurons establish distinct units that are reciprocally connected and share connectivity motifs. One of these units employs fast synaptic transmission as well as neuromodulation to target neuroendocrine cells (NSCs) of the pars intercerebralis, the Drosophila homolog of the hypothalamus. These NSCs produce CRH- and insulin-like peptides, which are homologs of downstream targets of NMU. Furthermore, most of the hugin-producing neurons, including those that target the NSCs, receive inputs from chemosensory neurons in the subesophageal zone, the brain stem analog in Drosophila . Our data positions hugin neurons ...Continue Reading

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Mentioned in this Paper

Hugin protein, Drosophila
Zone
Sensory Perception of Chemical Stimulus
Connectome
Entire Endocrine System
Neurons
NMU
Somatomedins
Synaptic Transmission
Drosophila

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