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In Vivo Electrochemical Measurement of the Long‐Lasting Release of Dopamine and Serotonin Induced by Intrastriatal Kainic Acid
Author(s) -
Nakazato Taizo,
Akiyama Akitane
Publication year - 1997
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.1471-4159.1997.69052039.x
Subject(s) - kainic acid , dopamine , serotonin , in vivo , chemistry , neuroscience , pharmacology , biophysics , medicine , biochemistry , biology , glutamate receptor , receptor , microbiology and biotechnology
Intrastriatal injection of the glutamate agonist kainic acid (KA) in rats has been used to produce an animal model to investigate the mechanism of acetylcholine and GABA cell death associated with Huntington's disease. In the present study, the time course of low (10 −5 M ) and high (5 × 10 −3 M ) concentrations of KA on striatal dopamine and serotonin release was studied in freely moving rats by using in vivo voltammetry. The response to low concentrations of KA varied between animals, either increasing dopamine release during the injection or increasing dopamine and serotonin after the injection for an extended time, suggesting that 10 −5 KA is near the threshold for KA toxicity in the striatum in rats. High concentrations of KA suppressed dopamine release during injection, with both dopamine and serotonin release increasing and remaining elevated for 1–4 and 7–21 days, respectively. KA‐induced changes were inhibited by 6‐cyano‐7‐nitroquinoxaline‐2,3‐dione and bicuculline increased the release of dopamine but not serotonin. These findings suggest that KA‐induced changes in dopamine release resulted from a disinhibition of dopamine neurons due to KA‐mediated toxicity of striatal GABA neurons. An alternate possibility is that the change in dopamine and serotonin release may have arisen from a functional modification or degeneration of presynaptic terminals.