Ttie particular mechanisms underlying the sub-second control of dopamine release by glutamate and other neurotransmitters/neuromodulators are not well-known largely because the analytical methodology required to address these important questions has not been sufficiently developed. Although one technique, fast-scan cyclic voltammetry at carbon-fiber microelectrodes, offers sufficient temporal resolution to measure the release and uptake of electroactive biogenic amines such as dopamine, its use in characterizing such sub-second neurotransmitter/neuromodulator interactions is lacking. This deficiency represents a serious roadblock because signaling events in the brain that influence outward physical responses and cognitive events occur within this sub-second time regime. Therefore, the central aim of this proposed research is to develop and apply tools that will allow for the quantitative study of these neurotransmitter/neuromodulator interactions in tissues and in vivo. Two temporally-compatible methods, fast-scan cyclic voltammetry and the photoactivation ofthe p-hydroxyphenyl caged form of glutamate (pHP-Glu), used here as a model caged system, will be applied to measure the sub-second response of dopamine release in response to millisecond timescale exposures to exogenous glutamate. The overall objective of this proposed research will be accomplished by successfully completing two specific aims: (1) integrate the sub-second measurement of electrically-evoked dopamine release with the photo-activation of caged compounds in brain slices and (2) optimize the construction and use of a combined probe/carbon-fiber microelectrode for measuring the impact of caged compound photoactivation on dopamine release events in vivo. This approach is innovative because it is among the first to simultaneously apply these two high temporal resolution techniques in living tissues and animals. The development and application of this proposed methodology is significant because it will enable laboratory researchers to measure sub-second timescale dopamine release in response to ?mu?s-timescale glutamate application. Moreover, this work should have a broad impact since the application of these techniques can be expanded to include the detection of other electroactive neurotransmitters and neuromodulators, such as serotonin, hydrogen peroxide (H{2}O{2}), and nitric oxide (NO), and the photoactivation of other bioactive molecules, such as GABA and specifically designed synthetic agonists/antagonists. Importantly, this research directly relates to the NIH mission of seeking fundamental knowledge about the nature and behavior of living systems and reducing the burdens of illness and disability in that applies to, but is not limited to: (1) fundamental neurobiological studies;(2) studies of dopamine-related movement disorders [e.g. Huntington's disease (HD), Parkinson's disease (PD), Tourette's syndrome (TS)];(3) studies of addiction and depression;and (4) studies addressing the mechanisms of action of CNS-active pharmacological agents.
This project aims at developing a method to study sub-second neurotransmitter interactions. These interactions likely play significant roles in the propagation of human disease. Therefore, a clearer understanding of these interactions has direct relevance to the NIH mission of seeking fundamental knowledge about the nature and behavior of living systems and reducing the burdens of illness and disability.
| Zhu, Qingfu; Heon, Mikala; Zhao, Zheng et al. (2018) Microfluidic engineering of exosomes: editing cellular messages for precision therapeutics. Lab Chip 18:1690-1703 |
| Pacelli, Settimio; Basu, Sayantani; Berkland, Cory et al. (2018) Design of a cytocompatible hydrogel coating to modulate properties of ceramic-based scaffolds for bone repair. Cell Mol Bioeng 11:211-217 |
| Wessinger, Carolyn A; Kelly, John K; Jiang, Peng et al. (2018) SNP-skimming: A fast approach to map loci generating quantitative variation in natural populations. Mol Ecol Resour 18:1402-1414 |
| Zhang, Peng; Crow, Jennifer; Lella, Divya et al. (2018) Ultrasensitive quantification of tumor mRNAs in extracellular vesicles with an integrated microfluidic digital analysis chip. Lab Chip 18:3790-3801 |
| Klaus, Jennifer R; Deay, Jacqueline; Neuenswander, Benjamin et al. (2018) Malleilactone Is a Burkholderia pseudomallei Virulence Factor Regulated by Antibiotics and Quorum Sensing. J Bacteriol 200: |
| Abisado, Rhea G; Benomar, Saida; Klaus, Jennifer R et al. (2018) Bacterial Quorum Sensing and Microbial Community Interactions. MBio 9: |
| Hill, Tom; Unckless, Robert L (2018) The dynamic evolution of Drosophila innubila Nudivirus. Infect Genet Evol 57:151-157 |
| Bandyopadhyay, Arnab; Wang, Huijing; Ray, J Christian J (2018) Lineage space and the propensity of bacterial cells to undergo growth transitions. PLoS Comput Biol 14:e1006380 |
| Kaplan, Sam V; Limbocker, Ryan A; Levant, Beth et al. (2018) Regional differences in dopamine release in the R6/2 mouse caudate putamen. Electroanalysis 30:1066-1072 |
| Reiner, David J; Lundquist, Erik A (2018) Small GTPases. WormBook 2018:1-65 |
Showing the most recent 10 out of 134 publications
