Topographical dopamine and serotonin distribution and turnover in rat striatum.
Topographic distribution of dopamine (DA), serotonin (5-HT), dihydroxyphenylacetic acid (DOPAC), hydroxyindoleacetic acid (5-HIAA) and homovanillic acid (HVA) was determined in rat striatum using high-pressure liquid chromatography (HPLC) with electrochemical detection. The ratios of DOPAC:DA and 5-HIAA:5-HT were calculated as indices of turnover of DA and 5-HT. There was a rostro-caudal gradient for both DA and 5-HT, with DA highest in rostral striatum and 5-HT highest in caudal striatum (P less than 0.01). DA concentrations in the coronal plane showed a homogeneous distribution except at the level of the globus pallidus. DOPAC also showed a rostro-caudal gradient and concentrations were significantly increased in the nucleus accumbens (P less than 0.01). DOPAC:DA ratios were significantly increased in both the nucleus accumbens and the ventromedial striatum as compared to the remaining striatal punches. 5-HT was more heterogeneously distributed in the coronal plane with concentrations highest in the ventromedial and the ventrolateral quadrants, where they were 2-3-fold higher than in dorsal striatum (P less than 0.01). Concentrations of 5-HIAA were highest in the nucleus accumbens and ventromedial striatum but HIAA-5-HT ratios were highest in the dorsolateral striatum (P less than 0.01). DA turnover is therefore highest in limbic innervated (n. accumbens and ventromedial) striatum while 5-HT turnover is highest in sensorimotor innervated (dorsolateral) striatum. These findings provide further evidence for functional compartmentalization within the striatum.
Beal
M F
MF
Martin
J B
JB
D015102:3,4-Dihydroxyphenylacetic Acid / Q000032:analysis; D000818:Animals; D002795:Choline O-Acetyltransferase / Q000378:metabolism; D002851:Chromatography, High Pressure Liquid; D003342:Corpus Striatum / Q000378:metabolism*; D004298:Dopamine / Q000032:analysis / Q000378:metabolism*; D005968:Glutamate Decarboxylase / Q000378:metabolism; D006719:Homovanillic Acid / Q000032:analysis; D006897:Hydroxyindoleacetic Acid / Q000032:analysis; D008297:Male; D051381:Rats; D012701:Serotonin / Q000032:analysis / Q000378:metabolism*
D015102:3,4-Dihydroxyphenylacetic Acid; D012701:Serotonin; D006897:Hydroxyindoleacetic Acid; D002795:Choline O-Acetyltransferase; D005968:Glutamate Decarboxylase; D004298:Dopamine; D006719:Homovanillic Acid