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Topographic distribution of dopamine uptake, choline uptake, choline acetyltransferase, and GABA uptake in the striata of weaver mutant mice

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Abstract

The topographic distribution of dopamine (DA) uptake, choline uptake, choline acetyltransferase (ChAT) activity and GABA uptake within the striata of weaver mutant mice and control mice was determined. Uptake of [3H]dopamine, [3H]choline and [14C]GABA, as well as ChAT activity were determined in samples prepared from the dorsolateral, dorsomedial, ventrolateral and ventromedial portions of the striatum. In 45–60 day old control mice, dopamine uptake was homogeneously distributed throughout the striatum. On the other hand, striata from weaver mice exhibited an uneven distribution with the ventral aspects having greater uptake activity than the dorsal regions. Thus, although the ventral portion of the striatum is less severely affected than the dorsal portion, all areas of the striatum exhibited significantly reduced uptake rates. In 9 and 12 month old mice, choline uptake was higher in lateral than medial zones of the striatum of both genotypes and no differences were observed between genotypes. GABA uptake was higher in the ventral striatum than in the dorsal striatum but again no differences were found between weaver and control mice. The results of this study indicate that the entire weaver striatum is severely deficient in its ability to recapture dopamine and thus is functionally compromised. The results also indicate that the striatal cholinergic and GABAergic interneurons are not directly or indirectly affected by the weaver gene.

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Special ïssue dedicated to Dr. Morris H. Aprison

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Simon, J.R., Ghetti, B. Topographic distribution of dopamine uptake, choline uptake, choline acetyltransferase, and GABA uptake in the striata of weaver mutant mice. Neurochem Res 17, 431–436 (1992). https://doi.org/10.1007/BF00969888

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