Abstract
In this study, we mapped the cerebral expression of Fos protein following intrastriatal stimulation of D(1) or D(2) receptors, in freely moving animals. Animals treated with the D(1) agonist SKF 38393 showed massive Fos increases in the cerebral cortex, ipsilaterally to the injected striatum, which were counteracted by systemic administration of D(1) antagonist SCH 23390. Conversely, D(2) agonist quinpirole suppressed cortical expression of Fos, while systemic administration of D(2) antagonist eticlopride relieved this blockade. As for the basal ganglia, Fos was consistently expressed only in the injected striatum of rats receiving SKF 38393. These results show that striatal dopamine receptors may play a role in the modulation of cortical activity. They also provide new information on a class of drugs--the dopamine agonists--whose role in the therapeutic strategy of Parkinson's disease is continuously evolving.
MeSH terms
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2,3,4,5-Tetrahydro-7,8-dihydroxy-1-phenyl-1H-3-benzazepine / pharmacology
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Animals
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Basal Ganglia / drug effects
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Basal Ganglia / metabolism
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Benzazepines / pharmacology
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Brain / drug effects*
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Brain / metabolism*
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Cerebral Cortex / drug effects
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Cerebral Cortex / metabolism
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Corpus Striatum / drug effects
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Corpus Striatum / metabolism
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Dopamine Agonists / pharmacology
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Dopamine Antagonists / pharmacology
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Male
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Oncogene Proteins v-fos / metabolism*
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Quinpirole / pharmacology
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Rats
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Rats, Sprague-Dawley
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Receptors, Dopamine / drug effects*
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Receptors, Dopamine / metabolism*
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Receptors, Dopamine D1 / drug effects
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Receptors, Dopamine D1 / metabolism
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Receptors, Dopamine D2 / drug effects
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Receptors, Dopamine D2 / metabolism
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Salicylamides / pharmacology
Substances
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Benzazepines
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Dopamine Agonists
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Dopamine Antagonists
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Oncogene Proteins v-fos
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Receptors, Dopamine
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Receptors, Dopamine D1
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Receptors, Dopamine D2
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Salicylamides
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Quinpirole
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2,3,4,5-Tetrahydro-7,8-dihydroxy-1-phenyl-1H-3-benzazepine
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eticlopride