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Related Experiment Video

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Monitoring Dopamine ex Vivo during Electrical Stimulation Using Liquid-Microjunction Surface Sampling.

Emily L Gill1, Megan Marks1, Richard A Yost1

  • 1Department of Chemistry, ‡Department of Neurosurgery, and §Department of Pathology, Immunology and Laboratory Medicine, University of Florida , Gainesville, Florida 32611, United States.

Analytical Chemistry
|November 2, 2017
PubMed
Summary
This summary is machine-generated.

Liquid-microjunction surface sampling (LMJ-SS) enables direct ex vivo brain analysis during electrical stimulation. This mass spectrometry method successfully monitored dopamine release in mouse striatum following deep brain stimulation, offering new insights for Parkinson's disease research.

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Area of Science:

  • Neuroscience
  • Analytical Chemistry
  • Biochemistry

Background:

  • Liquid-microjunction surface sampling (LMJ-SS) is an ambient ionization technique ideal for rapid, no-prep sampling of thick tissue sections.
  • Ex vivo tissue analysis is crucial for neuroscientific studies, requiring methods that preserve neural viability and networks.
  • Deep brain stimulation (DBS) is a therapy for Parkinson's disease (PD), a condition linked to dopamine neuron degeneration.

Purpose of the Study:

  • To demonstrate LMJ-SS as a platform for ex vivo brain analysis during electrical stimulation.
  • To monitor dopamine levels in mouse brain tissue following electrical stimulation of the striatum.
  • To assess the feasibility of LMJ-SS for real-time neurotransmitter monitoring in neuroscience.

Main Methods:

  • LMJ-SS was employed for direct ex vivo analysis of fresh mouse brain tissue.
  • Tissue was maintained in artificial cerebrospinal fluid to ensure near-physiological conditions.
  • Dopamine levels were monitored via mass spectrometry (m/z 154) before and after electrical stimulation of the striatum.

Main Results:

  • LMJ-SS successfully identified various metabolites, including energy-related ones, in mouse brain tissue.
  • A significant increase in dopamine signal was observed immediately after electrical stimulation of the striatum.
  • This study represents the first use of mass spectrometry methodologies to detect dopamine increases post-DBS in ex vivo brain tissue.

Conclusions:

  • LMJ-SS is a viable mass spectrometry-based method for ex vivo analysis of neurotransmitters during electrical brain stimulation.
  • The technique provides a novel approach for studying dopamine dynamics in the context of neurological disorders like Parkinson's disease.
  • LMJ-SS offers a valuable tool for neuroscientific research requiring real-time monitoring of neurochemicals in complex tissue environments.