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- W2896501203 abstract "The APOE-ε4 allele is the strongest genetic risk factor for sporadic Alzheimer's disease (sAD) and may be enriched in other clinically relevant populations. While APOE is predominantly expressed by astrocytes in the central nervous system, neuronal expression of APOE is of increasing interest in age-related cognitive impairment, neurological injury, and neurodegeneration. The human and mouse APOE promoter sequences are dissimilar, and contain distinct regions that control expression in a species specific, cell-type specific manner. APOE mRNA and protein is detectable in primary human neuronal cultures in a manner suggestive of de novo protein synthesis. However, neuronal expression of APOE has not been linked to neurotoxicity in a human system. We reprogrammed induced pluripotent stem cells (iPSCs) from three unrelated sAD patients with the ε3/ε4 genotype, used CRISPR/Cas9 gene editing to generate ε3/ε3 isogenic lines, and differentiated them into pure cultures of glutamatergic neurons with no detectable glia. APOE is synthesized and secreted by human induced neurons. Genetic correction of ε4 to ε3 reduces tau phosphorylation and phosphoactivation of a specific kinase. Moreover, ε4 is associated with altered amyloid secretion, and exacerbates the neurotoxic effects of a calcium ionophore. APOE is expressed in human glia-free neuronal culture system, and APOE isoform alters sAD-associated molecular pathways. More detailed mechanistic studies are required to better understand this phenomenon. However, the net effect is that endogenous expression of APOE-ε4 weakens neurons and contributes to the sAD cellular phenotype independently of, but likely cooperatively with, glial APOE." @default.
- W2896501203 created "2018-10-26" @default.
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- W2896501203 date "2018-07-01" @default.
- W2896501203 modified "2023-10-16" @default.
- W2896501203 title "P4‐263: NEURONAL APOE MODULATES A SPORADIC ALZHEIMER'S DISEASE PHENOTYPE IN PATIENT‐DERIVED INDUCED NEURONS" @default.
- W2896501203 doi "https://doi.org/10.1016/j.jalz.2018.07.085" @default.
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