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- W2028135093 abstract "The distribution of cerebellar [3H]muscimol binding sites was studied autoradiographically in normal C57BL/6J mice and in the weaver, reeler, Purkinje cell degeneration and staggerer mutant mice. In the normal 79-day-old mouse cerebellum, the highest concentration of [3H]muscimol binding sites was observed in the granule cell layer. A much lower grain density was present over the Purkinje cell and molecular layers and negligible numbers of binding sites were seen over the deep cerebellar nuclei and white matter. A significant decrease in [3H]muscimol labeling was observed over the cerebellar cortex of the 81–86-day-old weaver mutant; this was most pronounced in the vermis where granule cell loss was the greatest. Over the hemispheres, where fewer granule cells degenerate, a higher density of binding sites remained. In the 27–29-day-old reeler cerebellum, where Purkinje cells are malpositioned, no labeling was seen over the deep Purkinje cell masses. In the quasi-normal superficial cortex, labeling density over the surviving granule cell layer was only slightly decreased. In the 54–57-day-old Purkinje cell degeneration mutant, where essentially all Purkinje cells have disappeared by day 45, a 29% decrease in grain density over the granule cell layer was observed, while labeling was still present in the molecular layer. Virtually no [3H]muscimol labeling was detected over any part of the cerebellar cortex of the 25–27-day-old staggerer mutant (which lacks parallel fiber-Purkinje cell synapses), although clusters of surviving granule cells were present in significant numbers in the lateral aspects of the cortex. Our autoradiographic data indicate that GABAA receptors are associated with granule cells in both the molecular and granule cell layers. Furthermore, our results raise the possibility that the maintenance of receptor levels may be dependent upon synaptic contacts between the granule cell and its main postsynaptic target, the Purkinje cell." @default.
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- W2028135093 date "1988-01-01" @default.
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- W2028135093 title "The localization of GABAA receptors in mice with mutations affecting the structure and connectivity of the cerebellum" @default.
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- W2028135093 doi "https://doi.org/10.1016/0006-8993(88)91480-1" @default.
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