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- W2004209005 abstract "Abstract: The developmental pattern, the agonist binding properties and the cellular origin(s) of muscarinic binding sites were investigated in agranular cerebellum of x-irradiated rats, of Gunn rats with hereditary hyperbilirubinemia, and of staggerer mutant mice. The density of muscarinic binding sites was found to be higher than normal in all of these cerebellar types, indicating that granular neurons do not greatly contribute to binding of acetylcholine in the rodent cerebellum. The total number of muscarinic binding sites as measured by binding of [3H]4NMPB remains unchanged in the agranular cerebellum of x-irradiated rats. However, the number of muscarinic sites is reduced by about 30% in the agranular cerebellum of homozygous Gunn rats (jj), in which fibrous astrocytes and Purkinje cells are also damaged. In the cerebellum of staggerer mice (sg/sg), where a cascade of events leads to massive damage to mossy fibers and Golgi cells in addition to granular neurons and Purkinje cells, the content of muscarinic receptors is reduced by 50%. Thus, the number of muscarinic binding sites in the rodent cerebellum seems to depend on the integrity of the additional cell types and cellular elements, damaged in these agranular models. The ontogenetic variations in the affinity of cerebellar muscarinic sites for binding of carbamylcholine in normal and Gunn rat cerebellum were compared with those observed in x-irradiated and staggerer cerebellum, where elimination of granular neurons induces the formation of ‘heterologous’ synapses. Muscarinic binding affinity increases 10-fold during postnatal development in the cerebellum of normal and Gunn rats. In the immature x-irradiated cerebellum, the affinity of muscarinic binding sites was found to be nearly as high as that detected in the adult normal cerebellum. In contrast, cerebella of 5-month-old staggerer mice display 5-fold lower affinity than their normal counterpart values, as low as that determined in normal immature cerebellum. The characteristic ontogenetic pattern of muscarink binding is therefore indicated to be related to the formation of correct circuitry, but not to the presence of granular neurons, in the developing rat cerebellum." @default.
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- W2004209005 date "1982-09-01" @default.
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- W2004209005 title "Altered Ontogenesis of Muscarinic Receptors in Agranular Cerebellar Cortex" @default.
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- W2004209005 doi "https://doi.org/10.1111/j.1471-4159.1982.tb07957.x" @default.
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