Abstract
The effects of allylnitrile (ALN), which induces a long-term dyskinesia in mice, on the metabolism of serotonin (5-HT) and dopamine (DA) were studied after a single administration. One day after injection, ALN produced a significant increase in the levels of 5-HT, 5-hydroxyindoleacetic acid (5-HIAA) and homovanillic acid (HVA): 5-HT in the brain cortex, medulla oblongata plus pons, hypothalamus and midbrain; 5-HIAA in the cortex, medulla oblongata plus pons, striatum, hypothalamus and midbrain; the ratio of 5-HIAA/5-HT in the medulla oblongata plus pons, striatum and midbrain; HVA in the cortex and midbrain. These changes were not seen 10 and 35 days after injection when the animals were showing behavioral abnormalities. The present findings suggest that changes in 5-HT and DA metabolism are involved in the appearance of the dyskinetic syndrome.
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