We analyzed dendritic spine parameters in hippocampal and cortical brain regions after targeted expression of EGFP to allow high-resolution imaging, followed by algorithm-based evaluation of mice of both sexes from adolescence to old age. We observed an age-dependent loss of thin spines under most conditions as an indicator of a loss of synaptic plasticity in older mice. We also observed an increase in the protein levels of PSD and Arc in the hippocampus and cortex, respectively. Our data also indicated that spine morphology differs between sexes in a region-specific manner.
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