Development of Fluorescent False Neurotransmitters Monoamine neurotransmission plays important roles in modulation of excitatory and inhibitory synapses in the central nervous system and thus provides essential fine tuning of behavior in response to a changing environment. Consequently, aberrations in monoamine neurotransmission underlie many neurological and neuropsychiatric disorders including Parkinson?s disease, schizophrenia, ADHD, depression, and drug addiction. We have established an interdisciplinary research program focused on development of new molecular probes to study monoamine neurotransmission on a synaptic level. Specifically, we have introduced a conceptually new class of probes, termed ?fluorescent false neurotransmitters? (FFNs), that act as optical tracers of dopamine and norepinephrine. FFNs provide the first experimental means to image synaptic vesicle content uptake and release at individual presynaptic varicosities in brain tissue and in living animals. Using FFNs and multiphoton microscopy imaging we have made several unexpected findings, including the discovery of silent dopaminergic and noradrenergic synapses, activity-dependent super-charging of synaptic vesicles, and mechanistic insights on psychostimulant drugs. In this renewal application, we propose to expand the scope of FFNs to serotonin synapses, the third major monoamine system, on the basis of proof-of-concept studies. We will also develop new imaging and photon-counting methods based on the combinatorial use of FFNs as presynaptic probes with emerging genetically encoded monoamine reporters as postsynaptic sensors to provide multi-parameter synaptic readouts in living mice. In addition to complementing each FFN class with the corresponding sensor (for example, dopamine FFN and dopamine sensor), mixing and matching FFNs and sensors each for a different monoamine will enable simultaneous examination of two neurotransmitter systems. This in turn will enable the study of complex processes such as co-transmission and neurotransmitter switching on a synaptic level. We will also examine the effect of monoamine releasing agents on synaptic neurotransmitter dynamics at the dopamine, norepinephrine, and serotonin axonal release sites to probe both the vesicular pools in active and silent varicosities and the mechanisms of action of these psychoactive drugs. This application addresses a major unmet need in developing molecular tools and methods for imaging multiple neurotransmitter systems in living animals with adequate spatial and temporal resolution.

Public Health Relevance

Monoamine neurotransmitters such as dopamine, norepinephrine, and serotonin play essential roles in the nervous system by fine tuning learning and behavior, and malfunction of monoamine neurotransmission has been implicated in numerous neuropsychiatric diseases (depression, anxiety, substance use, and Parkinson?s disease). We will develop new imaging probes and methods to enable detailed readouts of neurotransmission processes on a synaptic level and advance neurobiology and neuropharmacology.

Agency
National Institute of Health (NIH)
Institute
National Institute of Mental Health (NIMH)
Type
Research Project (R01)
Project #
2R01MH108186-06
Application #
10052077
Study Section
Emerging Imaging Technologies in Neuroscience Study Section (EITN)
Program Officer
Nadler, Laurie S
Project Start
2015-05-18
Project End
2025-04-30
Budget Start
2020-07-01
Budget End
2021-04-30
Support Year
6
Fiscal Year
2020
Total Cost
Indirect Cost
Name
Columbia University (N.Y.)
Department
Chemistry
Type
Graduate Schools
DUNS #
049179401
City
New York
State
NY
Country
United States
Zip Code
10027
Lieberman, Ori J; McGuirt, Avery F; Tang, Guomei et al. (2018) Roles for neuronal and glial autophagy in synaptic pruning during development. Neurobiol Dis :
Henke, Adam; Kovalyova, Yekaterina; Dunn, Matthew et al. (2018) Toward Serotonin Fluorescent False Neurotransmitters: Development of Fluorescent Dual Serotonin and Vesicular Monoamine Transporter Substrates for Visualizing Serotonin Neurons. ACS Chem Neurosci 9:925-934
Clark, Samuel D; Mikofsky, Rachel; Lawson, Jacqueline et al. (2018) Piezo High Accuracy Surgical Osteal Removal (PHASOR): A Technique for Improved Cranial Window Surgery in Mice. J Vis Exp :
Dunn, Matthew; Henke, Adam; Clark, Samuel et al. (2018) Designing a norepinephrine optical tracer for imaging individual noradrenergic synapses and their activity in vivo. Nat Commun 9:2838
Bamford, Nigel S; Wightman, R Mark; Sulzer, David (2018) Dopamine's Effects on Corticostriatal Synapses during Reward-Based Behaviors. Neuron 97:494-510
Aguilar, Jenny I; Dunn, Matthew; Mingote, Susana et al. (2017) Neuronal Depolarization Drives Increased Dopamine Synaptic Vesicle Loading via VGLUT. Neuron 95:1074-1088.e7
Covey, Dan P; Mateo, Yolanda; Sulzer, David et al. (2017) Endocannabinoid modulation of dopamine neurotransmission. Neuropharmacology 124:52-61
Kempadoo, Kimberly A; Mosharov, Eugene V; Choi, Se Joon et al. (2016) Dopamine release from the locus coeruleus to the dorsal hippocampus promotes spatial learning and memory. Proc Natl Acad Sci U S A 113:14835-14840
Pereira, Daniela B; Schmitz, Yvonne; Mészáros, József et al. (2016) Fluorescent false neurotransmitter reveals functionally silent dopamine vesicle clusters in the striatum. Nat Neurosci 19:578-86
Freyberg, Zachary; Sonders, Mark S; Aguilar, Jenny I et al. (2016) Mechanisms of amphetamine action illuminated through optical monitoring of dopamine synaptic vesicles in Drosophila brain. Nat Commun 7:10652

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