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Neurosci."],"abstract":"<jats:sec>\n                    <jats:title>Introduction<\/jats:title>\n                    <jats:p>\n                      Although previous studies have reported associations between gonadotropins, testosterone, and Alzheimer\u2019s disease (AD), their longitudinal relationships with cognitive decline and temporal lobe atrophy remain insufficiently characterized. This study examined the association between baseline hormone levels and cognitive decline and temporal lobe volume loss trajectories, and whether these associations vary by sex or\n                      <jats:italic>APOE<\/jats:italic>\n                      \u03b5\n                      <jats:italic>4<\/jats:italic>\n                      status.\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Methods<\/jats:title>\n                    <jats:p>This study included 490 participants (378 MCI\/112 AD; 311 men\/179 women; mean age = 75.01 \u00b1 7.52) from the Alzheimer\u2019s Disease Neuroimaging Initiative (ADNI) cohort. Baseline plasma levels of gonadotropins (FSH, LH) and total testosterone (TT) were measured using Luminex xMAP multiplex immunoassay. Cognitive decline was assessed longitudinally through MMSE and ADAS-Cog 13 scores. Temporal lobe atrophy was quantified using tensor-based morphometry of 1.5T MRI scans, with bilateral temporal lobe volumes scaled to a normalized reference (1,000 = baseline). Linear mixed effects models were employed to relate baseline plasma hormones to longitudinal cognitive performance and temporal lobe volume.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results<\/jats:title>\n                    <jats:p>\n                      Longitudinal analyses showed that higher baseline FSH levels were associated with faster cognitive decline (MMSE: \u03b2 = \u22120.025,\n                      <jats:italic>P<\/jats:italic>\n                      = 0.012; ADAS-cog: \u03b2 = 0.066,\n                      <jats:italic>P<\/jats:italic>\n                      = 0.020) and accelerated temporal lobe atrophy (\u03b2 = \u22120.115,\n                      <jats:italic>P<\/jats:italic>\n                      = 0.005) in fully adjusted models. LH was also associated with faster temporal lobe atrophy (\u03b2 = \u22120.077,\n                      <jats:italic>P<\/jats:italic>\n                      = 0.034), while TT showed no significant association. Sex-stratified analyses showed that higher TT was associated with slower MMSE decline in women (\u03b2 = 0.022,\n                      <jats:italic>P<\/jats:italic>\n                      = 0.032) but not in men (\n                      <jats:italic>P<\/jats:italic>\n                      = 0.762), with a significant sex interaction (\n                      <jats:italic>P<\/jats:italic>\n                      -interaction = 0.020). Modification effects of\n                      <jats:italic>APOE<\/jats:italic>\n                      \u03b5\n                      <jats:italic>4<\/jats:italic>\n                      status on cognition and temporal lobe volume changes were not observed for FSH, LH, or TT.\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Discussion<\/jats:title>\n                    <jats:p>The results indicate that in individuals across the AD spectrum, elevated gonadotropin levels may exert deleterious, domain-specific effects on cognitive decline or temporal lobe atrophy. Women with lower TT levels may experience faster cognitive progression. Although future studies incorporating additional longitudinal hormone measurements and cognitive trajectories are warranted, our results underscore the importance of gonadotropins and testosterone in AD progression.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.3389\/fnins.2025.1696274","type":"journal-article","created":{"date-parts":[[2026,1,13]],"date-time":"2026-01-13T06:30:11Z","timestamp":1768285811000},"update-policy":"https:\/\/doi.org\/10.3389\/crossmark-policy","source":"Crossref","is-referenced-by-count":0,"title":["Longitudinal trajectories of cognitive decline and temporal lobe atrophy based on baseline gonadotropins and testosterone"],"prefix":"10.3389","volume":"19","author":[{"given":"Min","family":"Zhao","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Jiwei","family":"Jiang","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Linlin","family":"Wang","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Shiyi","family":"Yang","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Wenyi","family":"Li","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Qiwei","family":"Ren","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Huiying","family":"Zhang","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Tianlin","family":"Jiang","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Shirui","family":"Jiang","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Junya","family":"Zhou","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Jun","family":"Xu","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1965","published-online":{"date-parts":[[2026,1,13]]},"reference":[{"key":"B1","doi-asserted-by":"publisher","first-page":"1992","DOI":"10.1212\/wnl.53.9.1992","article-title":"Gender differences in the incidence of AD and vascular dementia: The EURODEM studies. 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