The wiring logic of an identified serotonergic neuron that spans sensory networks

Serotonergic neurons modulate diverse physiological and behavioral processes in a context-dependent manner, based on their complex connectivity. However, their connectivity has not been comprehensively explored at a single-cell resolution. Using a whole-brain EM dataset we determined the wiring logic of a broadly projecting serotonergic neuron (the “CSDn”) in Drosophila. Within the antennal lobe (AL; first-order olfactory region), the CSDn receives glomerulus-specific input and preferentially targets distinct local interneuron subtypes. Furthermore, the wiring logic of the CSDn differs between olfactory regions. The CSDn innervates the AL and lateral horn (LH), yet does not maintain the same synaptic relationship with individual projection neurons that also span both regions. Consistent with this, the CSDn has more distributed connectivity in the LH relative to the AL, preferentially synapsing with principal neuron types based on presumptive transmitter content. Lastly, we identify protocerebral neurons that provide abundant synaptic input to the CSDn. Our study demonstrates how an individual modulatory neuron can interact with local networks and integrate input from non-olfactory sources.

Molecular and anatomical organization of the dorsal raphe nucleus

The dorsal raphe nucleus (DRN) is an important source of neuromodulators and has been implicated in a wide variety of behavioral and neurological disorders. The DRN is subdivided into distinct anatomical subregions comprised of multiple cell types, and its complex cellular organization has impeded efforts to investigate the distinct circuit and behavioral functions of its subdomains. Here we used single-cell RNA sequencing, in situ hybridization, anatomical tracing, and spatial correlation analysis to map the transcriptional and spatial profiles of cells from the mouse DRN. Our analysis of 39,411 single-cell transcriptomes revealed at least 18 distinct neuron subtypes and 5 serotonergic neuron subtypes with distinct molecular and anatomical properties, including a serotonergic neuron subtype that preferentially innervates the basal ganglia. Our study lays out the molecular organization of distinct serotonergic and non-serotonergic subsystems, and will facilitate the design of strategies for further dissection of the DRN and its diverse functions.

Distribusi neuron serotonergik pada hipokampus Lasiwen (Myotis sp) sebagai satwa liar yang berpotensi menjadi reservoir virus rabies

Myotis sp is an Indonesian microchiropteran, insectivore bat that potential to be a reservoir for rabies virus. Rabies is fatal viral encephalitis and bat could act as wildlife potential reservoirs for the rabies virus and can transmit the disease to humans as the zoonotic disease. Hippocampus is one of diagnostic tissue for rabies disease and serotonergic neuron could involved in pathogenesis of rabies disease. The aim of the study is to investigate the distribution of serotonergic neurons in Myotis sp hippocampus. Five Myotis sp. were captured from wild population in Central Java, and were humanly anesthetized using ketamine and xylazin. The animals were perfused intracardially using NaCl 0.9% as the pre-rinse followed by 10% formaldehyde to fix it. The cerebrums were collected and processing the for paraffin embedding. Cerebrums were sectioning in saggital sections, 12 µm thickness serially with 120 µm intervals. The tissues were staining immunohistochemistry using antibody to serotonin (1/300; Bioss, Cat. No: bs-1126R) 2 night incubation in 4 oC temperature. The solution for blocking background, secondary antibody, avidin-biotin-peroxidae complex and chromogen using kit Starr Trek Universal HRP Detection System (Biocare Medical, Cat No: STUHRP700) and were analyzed descriptivelly. The results show that serotonergic neuros were distributed in the all area of the of Myotis sp hippocampus. In dentate gyrus neuron serotonergic (Sert-IR)s are round in shape and mostly distributed in the middle layer, few in the superficially also deeper layers. In the hippocampus , the Sert-IR neurons are pyramidal in shape and distributed in the CA1, Ca2 and CA3 areas. In subiculum, the Sert-IR neurons are pyramidal in shape, more wider distributed than in the CA1 with no differences between outer layer and deeper layer. The conclutions of this research are the serotonergic neurons are distributed in the all area of hippocampus