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• W2094255560 abstract "The dorsal and ventral striatum of mammals has been known to be organized in a mosaic manner, referred to as “patches” and “matrix” of the caudatoputamen.12,17,32 The present study was primarily attempted in order to reveal the relationship of glutamatergic neuronal components to the mosaic organization in the rat striatum by using a monoclonal antibody to phosphate-activated glutaminase, a major synthetic enzyme of transmitter glutamate. Antibodies against glutamate decarboxylase and choline acetyltransferase were also used as the markers for GABAergic and cholinergic neuronal components, respectively. Glutaminase immunoreactivity was seen in a number of large- and a few medium-sized neurons in the caudatoputamen, nucleus accumbens and olfactory tubercle. The large neurons with glutaminase immunoreactivity were immunoreactive for choline acetyltransferase. A mosaic distribution of glutaminase immunoreactivity was observed in the neuropil of the caudatoputamen and nucleus accumbens; glutaminase immunoreactivity was particularly marked in the neuropil of island-like patchy areas although it was seen throughout the neuropil of the nuclei. In the caudatoputamen, island-like areas with marked glutaminase immunoreactivity exhibited less marked choline acetyltransferase immunoreactivity than the surrounding background region, and were thus considered to correspond to the patches. The mosaic distribution of glutamate decarboxylase immunoreactivity in the caudatoputamen seemed identical with that of glutaminase immunoreactivity. However, in the nucleus accumbens, the mosaic pattern of neuropil labeling for glutaminase was neither consistent with that for glutamate decarboxylase nor that for choline acetyltransferase, suggesting the presence of non-GABAergic glutaminase-containing nerve terminals in the nucleus. In an attempt to clarify the origin of neuropil labeling for glutaminase in the striatum, lesions were made in the regions sending projection fibers to the caudatoputamen and nucleus accumbens. After placing lesions in the cerebral cortex, glutaminase immunoreactivity was decreased in neuropil of the caudatoputamen, but the mosaic pattern remained. Lesions which were placed in the intralaminar thalamic nuclei, amygdaloid body, globus pallidus or substantia nigra produced no substantial change in glutaminase immunoreactivity in the caudatoputamen and nucleus accumbens. After injection of kainic acid into the caudatoputamen or nucleus accumbens, glutaminase immunoreactivity in the neuropil of the affected regions was decreased to lose the mosaic pattern, indicating that neuronal components with glutaminase immunoreactivity in the neuropil of the patches were mainly of intrinsic origin. In summary, possible axon terminals containing glutaminase were observed with mosaic patterns in the caudatoputamen and nucleus accumbens, in which large cholinergic and medium-sized non-cholinergic neurons were immunoreactive for glutaminase. In the caudatoputamen, glutaminase immunoreactivity in neuropil was more marked in the patches than in the matrix. The main source of glutaminase-containing axons in the patches or matrix was indicated to be non-cholinergic medium-sized neurons within the patches or glutamatergic neurons in the cerebral cortex, respectively. In the nucleus accumbens, glutaminase-containing axons appeared to be mainly derived from medium-sized intrinsic, putatively glutamatergic neurons." @default.
• W2094255560 created "2016-06-24" @default.
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• W2094255560 date "1992-07-01" @default.
• W2094255560 modified "2023-09-24" @default.
• W2094255560 title "Mosaic distribution of phosphate-activated glutaminase-like immunoreactivity in the rat striatum" @default.
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• W2094255560 doi "https://doi.org/10.1016/0306-4522(92)90100-g" @default.
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