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• W2018752732 abstract "Apolipoprotein (apo) E4 is the major genetic risk factor for Alzheimer's disease (AD). ApoE4 has sex-dependent effects, whereby the risk of developing AD is higher in apoE4-expressing females than males. However, the mechanism underlying the sex difference, in relation to apoE4, is unknown. Previous findings indicate that apoE4 causes age-dependent impairments of hilar GABAergic interneurons in female mice, leading to learning and memory deficits. Here, we investigate whether the detrimental effects of apoE4 on hilar GABAergic interneurons are sex-dependent using apoE knock-in (KI) mice across different ages. Cognitive function was analyzed in 12-month and 16-month old male and female apoE-KI mice. Immunohistochemical studies were conducted on apoE-KI mice at various ages, and positive cells in the hippocampal region and cortex were subsequently quantified by design-based stereology. We found that in female apoE-KI mice, there was an age-dependent depletion of hilar GABAergic interneurons, whereby GAD67- or somatostatin-positive-but not NPY- or parvalbumin-positive-interneuron loss was exacerbated by apoE4. This effect was recapitulated in female mice expressing apoE4 in CNS neurons. Loss of these neuronal populations was correlated with the severity of spatial learning deficits at 16 months of age in female apoE4-KI mice; however, this phenotype was not observed in female apoE3-KI mice. In contrast, we found an increase in the numbers of hilar GABAergic interneurons with advancing age in male apoE-KI mice, regardless of apoE genotype. Moreover, male apoE-KI mice showed a consistent ratio of hilar inhibitory GABAergic interneurons to excitatory mossy cells approximating 1.5 that is independent of apoE genotype and age, whereas female apoE-KI mice exhibited an age-dependent decrease in this ratio, which was exacerbated by apoE4. Accordingly, female apoE4-KI mice exhibited greater susceptibility to drug-induced seizures than male apoE4-KI mice. Interestingly, there are no apoE genotype effects on GABAergic interneurons in the CA1 and CA3 subregions of the hippocampus as well as the entorhinal and auditory cortexes. These findings suggest that the sex-dependent effects of apoE4 on developing AD is in part attributable to inherent sex-based differences in the numbers of hilar GABAergic interneurons, which is further modulated by apoE genotype." @default.
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• W2018752732 date "2013-07-01" @default.
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• W2018752732 title "P2-037: Age-dependent impairment of hilar GABAergic interneurons and cognitive function in Apolipoprotein E-ε4 knock-in mice is modified by sex" @default.
• W2018752732 doi "https://doi.org/10.1016/j.jalz.2013.05.679" @default.
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