Model systems are used to understand how neurotransmission is regulated and how it malfunctions during diseases. Drosophila, the fruit fly, is an attractive model organism because it is easy to genetically alter, fast to breed, inexpensive, and has complex behaviors. Drosophila has many neurotransmitter systems similar to mammals, including dopaminergic and serotonergic systems. While dopamine and serotonin measurements have been made in the larval Drosophila ventral nerve cord, no measurements of endogenous release have been made in the adult fly brain. Adult flies have a fully developed nervous system and would be a good model system for studying the regulation of neurotransmitters in mental health diseases. The long-term goal of my lab is to develop new analytical tools to understand real-time neurotransmission in biological systems. The goal of this project is to characterize the regulation of dopamine and serotonin signaling in specific neuropil of the adult and larval Drosophila. Specifically, we will determine which serotonin receptors act as auto receptors and how dopamine is regulated by RING finger protein 11 (RNF11), a modulator of the NF-?B pathway. The central hypothesis is that neurotransmitter regulation varies with age and by neuropil.
Aim 1 is to compare dopamine release in discrete areas of the larval and adult CNS. Release will be evoked by optically activating genetically-inserted CsChrimson and the effect of aging on dopamine release will be studied in the adult.
In Aim 2, we will explore the regulation of dopamine by RNF11 using RNAi knockdown of RNF11. The effect of D2 auto receptor antagonist antipsychotics will be studied in RNF11 RNAi flies, to investigate the extent to which RNF11 affects auto receptor regulation of dopamine. These will be the first studies of the effect of RNF11 on dopamine signaling in any species.
In Aim 3, we will investigate stimulated serotonin release and reuptake in larvae (protocerebrum and VNC) and adults (mushroom bodies, VNC). The serotonin system is a target of many treatments for mental illness, so understanding it in flies will enable its use as a model organism of mental diseases. Finally, for Aim 4, we will determine the effect of serotonin auto receptors on serotonin regulation in larvae and adults using both pharmacological and genetic approaches. The expected outcomes of this work are better methods for characterizing neurotransmission in specific Drosophila neuropil and an understanding of the regulation of dopamine and serotonin release throughout Drosophila development. The research is significant because it will provide foundational knowledge of neurotransmitter signaling necessary to use the powerful genetic tools available for Drosophila to study the effects of specific genes in controlling neurotransmission. Future studies could examine how dopaminergic and serotonergic neurotransmission control behaviors or function in diseases in adult Drosophila.

Public Health Relevance

This research will lead to a better understanding of the basic neurobiology of dopamine and serotonin, both of which are important for mental health disorders. We will develop new methods to understand neurotransmitter signaling in the larval and adult fruit fly nervous system. These studies are important because understanding disorders such as schizophrenia or depression require an understanding of the underlying neurotransmission.

Agency
National Institute of Health (NIH)
Institute
National Institute of Mental Health (NIMH)
Type
Research Project (R01)
Project #
5R01MH085159-07
Application #
9273605
Study Section
Special Emphasis Panel (ZRG1-IMST-L (02)M)
Program Officer
Nadler, Laurie S
Project Start
2009-07-15
Project End
2021-02-28
Budget Start
2017-03-01
Budget End
2018-02-28
Support Year
7
Fiscal Year
2017
Total Cost
$341,312
Indirect Cost
$116,312
Name
University of Virginia
Department
Chemistry
Type
Schools of Arts and Sciences
DUNS #
065391526
City
Charlottesville
State
VA
Country
United States
Zip Code
22904
Shin, Mimi; Copeland, Jeffrey M; Venton, B Jill (2018) Drosophila as a Model System for Neurotransmitter Measurements. ACS Chem Neurosci 9:1872-1883
Pyakurel, Poojan; Shin, Mimi; Venton, B Jill (2018) Nicotinic acetylcholine receptor (nAChR) mediated dopamine release in larval Drosophila melanogaster. Neurochem Int 114:33-41
Shin, Mimi; Venton, B Jill (2018) Electrochemical Measurements of Acetylcholine-Stimulated Dopamine Release in Adult Drosophila melanogaster Brains. Anal Chem 90:10318-10325
Yang, Cheng; Wang, Ying; Jacobs, Christopher B et al. (2017) O2 Plasma Etching and Antistatic Gun Surface Modifications for CNT Yarn Microelectrode Improve Sensitivity and Antifouling Properties. Anal Chem 89:5605-5611
Ganesana, Mallikarjunarao; Lee, Scott T; Wang, Ying et al. (2017) Analytical Techniques in Neuroscience: Recent Advances in Imaging, Separation, and Electrochemical Methods. Anal Chem 89:314-341
Pyakurel, Poojan; Privman Champaloux, Eve; Venton, B Jill (2016) Fast-Scan Cyclic Voltammetry (FSCV) Detection of Endogenous Octopamine in Drosophila melanogaster Ventral Nerve Cord. ACS Chem Neurosci 7:1112-9
Denno, Madelaine E; Privman, Eve; Borman, Ryan P et al. (2016) Quantification of Histamine and Carcinine in Drosophila melanogaster Tissues. ACS Chem Neurosci 7:407-14
Yang, Cheng; Denno, Madelaine E; Pyakurel, Poojan et al. (2015) Recent trends in carbon nanomaterial-based electrochemical sensors for biomolecules: A review. Anal Chim Acta 887:17-37
Denno, Madelaine E; Privman, Eve; Venton, B Jill (2015) Analysis of neurotransmitter tissue content of Drosophila melanogaster in different life stages. ACS Chem Neurosci 6:117-23
Privman, Eve; Venton, B Jill (2015) Comparison of dopamine kinetics in the larval Drosophila ventral nerve cord and protocerebrum with improved optogenetic stimulation. J Neurochem 135:695-704

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