{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,2]],"date-time":"2026-10-02T00:14:52Z","timestamp":1790900092352,"version":"4.1.0"},"reference-count":96,"publisher":"MDPI AG","issue":"8","license":[{"start":{"date-parts":[[2025,4,16]],"date-time":"2025-04-16T00:00:00Z","timestamp":1744761600000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/100000006","name":"Office of Navy Research","doi-asserted-by":"publisher","award":["N0001417WX01558"],"award-info":[{"award-number":["N0001417WX01558"]}],"id":[{"id":"10.13039\/100000006","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/100000006","name":"Office of Navy Research","doi-asserted-by":"publisher","award":["N000142190002"],"award-info":[{"award-number":["N000142190002"]}],"id":[{"id":"10.13039\/100000006","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["IJMS"],"abstract":"<jats:p>There is an urgent need to identify interventions that broadly target aging-related cognitive decline and progression to Alzheimer\u2019s disease (AD). Bottlenose dolphins (Tursiops truncatus) have histologic changes similar to AD in humans, and they also develop shared age-associated co-morbidities identified as risk factors for AD in humans, including type 2 diabetes, ferroptosis, and iron overload, which can be driven by nutritional C15:0 deficiency. We hypothesized that (1) dolphins would have amyloid beta (A\u03b2) plaques and neuroinflammation that paralleled that of humans in relation to age-related progression, quantitative concentration, and brain region; and (2) C15:0 would have dose-dependent activities relevant to protecting cognitive health. Quantitative immunohistochemistry staining was used to assess 68 tissues from archived brains of 19 Navy dolphins to evaluate associations among amyloid beta (A\u03b2) plaques and neuroinflammation by brain region, sex, and age group. Further, dose-dependent C15:0 activities, using a third-party panel intended to screen for potential AD therapeutics, were evaluated. Similar to humans, dolphins had the highest A\u03b2 plaque density variation in the hippocampus (90th percentile of 4.95 plaques\/mm2), where plaque density increased with age (p = 0.05). All measured markers of neuroinflammation were detected, including the highest concentrations of activated microglia (CD68+) in the hippocampus (0.46 \u00b1 0.38 cells\/mm2). C15:0 was a dose-dependent inhibitor of two targets, fatty acid amide hydrolase (FAAH) (IC50 2.5 \u00b5M, 89% maximum inhibition at 50 \u00b5M relative to URB597) and monoamine oxidase B (MAO-B) (IC50 19.4 \u00b5M, 70% maximum inhibition at 50 \u00b5M relative to R(-)-Deprenyl). These activities have demonstrated efficacy against A\u03b2 formation and neuroinflammation, including protection of cognitive function in the hippocampus. These findings suggest that, in addition to protecting against AD co-morbidities, C15:0 may play a distinct role in supporting cognitive health, especially at higher concentrations.<\/jats:p>","DOI":"10.3390\/ijms26083746","type":"journal-article","created":{"date-parts":[[2025,4,16]],"date-time":"2025-04-16T04:05:31Z","timestamp":1744776331000},"page":"3746","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":8,"title":["Aging-Associated Amyloid-\u03b2 Plaques and Neuroinflammation in Bottlenose Dolphins (Tursiops truncatus) and Novel Cognitive Health-Supporting Roles of Pentadecanoic Acid (C15:0)"],"prefix":"10.3390","volume":"26","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-3309-4237","authenticated-orcid":false,"given":"Stephanie","family":"Venn-Watson","sequence":"first","affiliation":[{"name":"Epitracker, Inc., San Diego, CA 92106, USA"},{"name":"Seraphina Therapeutics, Inc., San Diego, CA 92106, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Eric D.","family":"Jensen","sequence":"additional","affiliation":[{"name":"U.S. Navy Marine Mammal Program, San Diego, CA 92152, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2025,4,16]]},"reference":[{"key":"ref_1","unstructured":"(2025, January 20). 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