{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,8,18]],"date-time":"2026-08-18T04:19:39Z","timestamp":1787026779590,"version":"build-2736575974"},"reference-count":97,"publisher":"Frontiers Media SA","license":[{"start":{"date-parts":[[2024,9,13]],"date-time":"2024-09-13T00:00:00Z","timestamp":1726185600000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":["frontiersin.org"],"crossmark-restriction":true},"short-container-title":["Front. Aging Neurosci."],"abstract":"<jats:p>\n                    The main genetic risk factor for Alzheimer\u2019s disease (AD) is the apolipoprotein E \u03b54 allele (\n                    <jats:italic>APOE4<\/jats:italic>\n                    ). AD risk associated with\n                    <jats:italic>APOE4<\/jats:italic>\n                    disproportionately affects women. Furthermore, human and rodent studies indicate that the cognitive deficits associated with\n                    <jats:italic>APOE4<\/jats:italic>\n                    are greater in females. One modifiable AD risk factor is obesity during middle age. Given that approximately two-thirds of US adults are overweight, it is important to understand how obesity affects AD risk, how it interacts with\n                    <jats:italic>APOE4<\/jats:italic>\n                    , and the extent to which its detrimental effects can be mitigated with therapeutics. One intervention study for women is estrogen-based hormone therapy, which can exert numerous health benefits when administered in early middle age. No experimental studies have examined the interactions among\n                    <jats:italic>APOE4<\/jats:italic>\n                    , obesity, and hormone therapy in aging females. To begin to explore these issues, we considered how obesity outcomes are affected by treatment with estradiol at the onset of middle age in female mice with human\n                    <jats:italic>APOE3<\/jats:italic>\n                    and\n                    <jats:italic>APOE4<\/jats:italic>\n                    . Furthermore, to explore how gene dosage affects outcomes, we compared mice homozygous for\n                    <jats:italic>APOE3<\/jats:italic>\n                    (3\/3) and homozygous (4\/4) or hemizygous (3\/4) for\n                    <jats:italic>APOE4<\/jats:italic>\n                    . Mice were examined over a 4-month period that spans the transition into reproductive senescence, a normal age-related change that models many aspects of human perimenopause. Beginning at 5\u2009months of age, mice were maintained on a control diet (10% fat) or high-fat diet (HFD; 60% fat). After 8\u2009weeks, by which time obesity was present in all HFD groups, mice were implanted with an estradiol or vehicle capsule that was maintained for the final 8\u2009weeks. Animals were assessed on a range of metabolic and neural measures. Overall,\n                    <jats:italic>APOE4<\/jats:italic>\n                    was associated with poorer metabolic function and cognitive performance. However, an obesogenic diet induced relatively greater impairments in metabolic function and cognitive performance in\n                    <jats:italic>APOE3\/3<\/jats:italic>\n                    mice. Estradiol treatment improved metabolic and cognitive outcomes across all HFD groups, with\n                    <jats:italic>APOE4\/4<\/jats:italic>\n                    generally exhibiting the greatest benefit.\n                    <jats:italic>APOE3\/4<\/jats:italic>\n                    mice were intermediate to the homozygous genotypes on many measures but also exhibited unique profiles. Together, these findings highlight the importance of the\n                    <jats:italic>APOE<\/jats:italic>\n                    genotype as a modulator of the risks associated with obesity and the beneficial outcomes of estradiol.\n                  <\/jats:p>","DOI":"10.3389\/fnagi.2024.1415072","type":"journal-article","created":{"date-parts":[[2024,9,13]],"date-time":"2024-09-13T00:57:05Z","timestamp":1726189025000},"update-policy":"https:\/\/doi.org\/10.3389\/crossmark-policy","source":"Crossref","is-referenced-by-count":9,"title":["Effects of obesogenic diet and 17\u03b2-estradiol in female mice with APOE 3\/3, 3\/4, and 4\/4 genotypes"],"prefix":"10.3389","volume":"16","author":[{"given":"Amy","family":"Christensen","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Cassandra J.","family":"McGill","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Wenjie","family":"Qian","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Christian J.","family":"Pike","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1965","published-online":{"date-parts":[[2024,9,13]]},"reference":[{"key":"ref1","doi-asserted-by":"publisher","first-page":"991","DOI":"10.1152\/physrev.00004.2014","article-title":"Regulation and function of adult neurogenesis: from genes to cognition","volume":"94","author":"Aimone","year":"2014","journal-title":"Physiol. 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