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Literature data indicate a reduced calcium uptake in synaptosomes prepared from old rat brains. On this line, the present paper investigates the binding of ([3H]NDP) to brain synaptic membranes prepared from rats at different ages from birth up to 24 months of age. The binding is undetectable at birth but reaches within 9-18 day the values observed in adults [3H]NDP binding affinity and sensitivity to calcium were decreased in old rats (24 months). Tritiated dihydropyridines are believed to label voltage-dependent calcium channels (VDC). The observed age-related reduction in binding suggests that the characteristics of VDC in the aged brain may change.
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