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Mobilization of Storage Pool Dopamine and Late Ipsilateral Augmentation of Striatal Dopamine Synthesis in the Trained Circling Rat
Author(s) -
Bennett Barbara A.,
Freed Curt R.
Publication year - 1986
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 - 10.1111/j.1471-4159.1986.tb04525.x
Subject(s) - dopamine , striatum , chemistry , 3,4 dihydroxyphenylacetic acid , endocrinology , medicine , catecholamine , homovanillic acid , biochemistry , serotonin , receptor
Rats were infused intraventricularly with [ 3 H]tyrosine over a 20–min period during various times while circling. 3,4–Dihydroxyphenylethylamine (dopamine) and dihydroxyphenylacetic acid (DOPAC) levels were measured using HPLC with electrochemical detection and fractions were collected for tritium monitoring. During the first 20 min of circling, the specific activity of dopamine was increased by 290% in striatum contralateral to the circling direction whereas DOPAC specific activity was increased 50% on the same side. This differential change in relative specific activity suggests that unlabeled storage pool dopamine was mobilized to DOPAC during circling. Synthesis of dopamine and DOPAC in contralateral striatum returned to baseline levels as turning slowed (50–70 min). When turning ceased, there was an increase in ipsilateral striatal dopamine synthesis during the 20–min period following circling. We hypothesize that this ipsilateral increase represents either a “stop” signal following circling or a release of inhibition of ipsilateral nigral neurons.