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Direct Comparison of the Response of Voltammetry and Microdialysis to Electrically Evoked Release of Striatal Dopamine
Author(s) -
Lu Yi,
Peters Jennifer L.,
Michael Adrian C.
Publication year - 1998
Publication title -
journal of neurochemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.75
H-Index - 229
eISSN - 1471-4159
pISSN - 0022-3042
DOI - 10.1046/j.1471-4159.1998.70020584.x
Subject(s) - microdialysis , nomifensine , dopamine , medial forebrain bundle , in vivo , microelectrode , chemistry , voltammetry , extracellular fluid , extracellular , striatum , biophysics , neuroscience , biomedical engineering , biology , medicine , biochemistry , electrode , dopaminergic , microbiology and biotechnology , electrochemistry
Carbon fiber microelectrodes either were implanted directly into striatal tissue or were mounted into the outlet of microdialysis probes that were implanted into striatal tissue. This allowed voltammetry and microdialysis to be used under identical in vivo experimental conditions to monitor extracellular dopamine levels during electrical stimulation of the medial forebrain bundle both before and after uptake inhibition with nomifensine. The marked differences between the results obtained with each technique cannot be explained on the basis of their inherent analytical attributes (sensitivity, temporal response, etc.). The results demonstrate that the microdialysis recovery factor for endogenous dopamine increases after uptake inhibition, an observation that stands in contradiction to the existing theory and practice of the microdialysis technique. The observations led to the development of a numerical model that rationalizes the observations reported herein and that allows in vivo voltammetry and in vivo microdialysis results to be interpreted within a single theoretical framework.