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Single Cell Measurement of Dopamine Release with Simultaneous Voltage-clamp and Amperometry
Published on: November 21, 2012
Second-by-second measurement of acetylcholine release in prefrontal cortex
John P Bruno1, Clelland Gash, Brad Martin
1Department of Psychology, 57 Psychology Building, The Ohio State University, Columbus, OH 43210, USA. bruno.1@osu.edu
The European Journal of Neuroscience
|December 13, 2006
Summary
A novel microelectrode array (MEA) rapidly measures acetylcholine (ACh) release in vivo, offering superior spatial and temporal resolution compared to microdialysis for studying cholinergic transmission.
Area of Science:
- Neuroscience
- Electrochemistry
- Pharmacology
Background:
- Microdialysis is a common technique for measuring acetylcholine (ACh) release in vivo.
- However, microdialysis has limitations in spatial and temporal resolution.
- There is a need for more advanced methods to study cholinergic transmission with higher precision.
Purpose of the Study:
- To develop and validate a microelectrode array (MEA) for rapid, high-resolution measurement of ACh release in vivo.
- To assess the MEA's performance in detecting endogenous ACh release and its response to pharmacological stimuli.
- To compare the MEA's capabilities with conventional microdialysis techniques.
Main Methods:
- Utilized a microelectrode array (MEA) for electrochemical detection of ACh hydrolysis products (choline and H2O2).
- Performed in vitro calibration to determine linearity, limit of detection, and selectivity against interferents (ascorbic acid, dopamine, norepinephrine).
- Conducted in vivo experiments in the prefrontal cortex of anesthetized rats, measuring ACh release induced by pressure ejection, KCl depolarization, and nicotine stimulation.
Main Results:
- The MEA demonstrated linear responses to ACh in vitro (R2 = 0.9998) with a low limit of detection (0.08 µM) and was unresponsive to common interferents.
- In vivo, the MEA rapidly detected ACh release (peak in ~1.0 s) and clearance (80% within 4-11 s) following pressure ejections and KCl depolarization.
- Nicotine-stimulated ACh release was detected and confirmed to be mediated by endogenous acetylcholinesterase, as evidenced by signal attenuation with neostigmine.
Conclusions:
- The developed MEA provides a novel, highly sensitive method for real-time measurement of cholinergic transmission in vivo.
- This technique offers significantly improved spatial and temporal resolution over traditional microdialysis.
- The MEA is a valuable tool for advancing research into the regulation of cholinergic neurotransmission.