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• W2022027655 abstract "Post-mortem cortices from patients diagnosed with Alzheimer's disease (AD) exhibit reduced levels of drebrin, an F-actin binding protein of dendritic spines and shafts. We used a mouse model of familial AD (FAD) to determine whether the density of cortical spines engaged in asymmetric (presumably excitatory) synapses and containing drebrin A is reduced and if so, whether this occurs prior to the emergence of beta amyloid deposits, when only soluble beta amyloid (Abeta) is present. Quantitative electron microscopic immunocytochemistry revealed that by 6 months, the proportion of postsynaptic spines with drebrin A within somatosensory cortex layer I was smaller for the FAD model mice, when compared to the corresponding region of WT mice (P < 0.0005). However, the areal density of postsynaptic spines containing drebrin A was relatively constant from 3 to 18 months and beyond for both genotypes, suggesting that drebrin A confers stability to postsynaptic spines. Further measurements confirmed that the reduced proportion of drebrin A-containing spines in brains of FAD mice at 6 months is due to the greater size and areal density of spine profiles lacking drebrin A. Thus, soluble Abeta could affect spines lacking drebrin A more strongly than spines containing drebrin A. At 6 months and older, a larger fraction of spinous drebrin A in 2xKI mice was located near the synaptic membrane, as compared to those of WT mice. This pattern may reflect an altered trafficking of synaptic molecules within spines, a factor adding to the decline of synaptic function and plasticity." @default.
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• W2022027655 date "2005-12-01" @default.
• W2022027655 modified "2023-09-27" @default.
• W2022027655 title "Stability of the distribution of spines containing drebrin A in the sensory cortex layer I of mice expressing mutated APP and PS1 genes" @default.
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• W2022027655 doi "https://doi.org/10.1016/j.brainres.2005.10.012" @default.
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