![\"APOE2](\"https:\/\/scitechdaily.com\/images\/APOE2-Helps-Neurons-Repair-DNA-and-Resist-Aging.jpg\")
<\/a>Scientists have uncovered proof that APOE2 could assist mind cells higher stand up to stress and age-related injury, revealing a potential organic rationalization for its protecting results towards Alzheimer\u2019s<\/span> disease.<\/strong><\/p>\n People with the APOE2 variant of the apolipoprotein E gene are known to have a lower risk of Alzheimer\u2019s disease and are more likely to live longer lives, but researchers have not fully understood why. A new study from the Buck Institute for Research on Aging, published in Aging Cell, suggests that APOE2 may protect brain cells by helping them preserve DNA<\/span> and avoid cellular senescence, a harmful aging-related state linked to neurodegeneration.<\/p>\n The research points to a lesser-known role for APOE beyond its involvement in cholesterol transport. Scientists found that the gene may also influence how well neurons maintain the stability of their genetic material over time.<\/p>\n \u201cWe\u2019ve known for years that APOE2 carriers tend to live longer and have a lower risk of Alzheimer\u2019s, but the protective mechanism has been a black box,\u201d says senior author Lisa M. Ellerby, PhD, professor at the Buck Institute. \u201cOur work shows that APOE2 neurons are better at preventing and repairing DNA damage, and they resist the cellular aging program that drives so much of late-life decline. Our findings point to entirely new therapeutic directions.\u201d<\/p>\n There are three common forms of APOE: APOE2, APOE3, and APOE4. The variants differ by only two amino acids<\/span>. APOE4 is considered the strongest genetic risk factor for late-onset Alzheimer\u2019s disease (typically after age 65), while APOE2 has repeatedly been associated with longer lifespan and lower dementia risk.<\/p>\n To study APOE\u2019s direct role in brain aging, researchers used human induced pluripotent stem cells (iPSCs) engineered so that the only genetic difference was the APOE variant. The team produced two types of neurons from the cells: inhibitory GABAergic neurons and excitatory glutamatergic neurons. They then compared how each APOE form affected the cells. The scientists also analyzed hippocampal tissue from older mice carrying human APOE2, APOE3, or APOE4 genes.<\/p>\n Scientists increasingly view cellular senescence and DNA damage as major contributors to aging and age-related diseases, including Alzheimer\u2019s disease.<\/p>\n \u201cUntil now, the APOE field has focused largely on lipid handling and amyloid-beta biology,\u201d said Ellerby. \u201cBy showing that APOE alleles also tune how neurons defend their genome, this study connects a major longevity gene to two of the most actively studied hallmarks of aging.\u201d<\/p>\n According to Ellerby, therapies that improve DNA repair or remove senescent cells from the brain could potentially reproduce some of APOE2\u2019s natural protective effects, especially for people with the higher-risk APOE4 variant.<\/p>\n \u201cWhat surprised us was how consistent the picture was across two very different neuron types and across human cells and mouse brain tissue,\u201d said co-first author Cristian Ger\u00f3nimo-Olvera, PhD, a postdoctoral fellow at the Buck Institute. \u201cAPOE2 neurons aren\u2019t just less damaged at baseline, they recover faster when stressed.\u201d<\/p>\n The researchers noted that the exact molecular process by which APOE2 supports DNA repair and stabilizes the nuclear envelope is still unclear. Future studies will investigate whether APOE2-mimicking compounds or targeted DNA repair therapies could offer similar protection for APOE4 carriers, who face the highest genetic risk for Alzheimer\u2019s disease.<\/p>\n Reference: \u201cExceptional Longevity Modifying Allele APOE2 Promotes DNA Signaling Pathways Resisting Cellular Senescence in Human Neurons\u201d by Cristian Ger\u00f3nimo-Olvera, Stephen M. Scheeler, Carlos Galicia Aguirre, Genesis Vega-Hormazabal, Daniela Garcia, Long Wu, Natalia Murad, Kevin Schneider, Kenneth A. Wilson, Nikola T. Markov, Sicheng Song, Jesse Simons, Akos A. Gerencser, Emily Parlan, Sean D. Mooney, Eric Verdin, Judith Campisi, Tara E. Tracy, David Furman, Simon Melov and Lisa M. Ellerby, 8 May 2026, Aging Cell<\/i>. Funding: National Institute on Aging, Hevolution Foundation, Glenn Foundation for Medical Research<\/p>\n Never miss a breakthrough: Join the SciTechDaily newsletter.<\/a><\/b>Comparing the Different APOE Variants<\/h4>\n
Key findings<\/h4>\n
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Implications for Future Alzheimer\u2019s Therapies<\/h4>\n
DOI: 10.1111\/acel.70494<\/a><\/p>\n
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