{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"institution":[{"name":"bioRxiv"}],"indexed":{"date-parts":[[2026,6,24]],"date-time":"2026-06-24T05:59:11Z","timestamp":1782280751477,"version":"3.54.5"},"posted":{"date-parts":[[2025,7,5]]},"group-title":"Pharmacology and Toxicology","reference-count":0,"publisher":"openRxiv","license":[{"start":{"date-parts":[[2025,7,5]],"date-time":"2025-07-05T00:00:00Z","timestamp":1751673600000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/www.biorxiv.org\/about\/FAQ#license"}],"funder":[{"name":"National Institutes of Health","award":["R01 NS13065"],"award-info":[{"award-number":["R01 NS13065"]}]},{"name":"National Institutes of Health","award":["R01 CA241666"],"award-info":[{"award-number":["R01 CA241666"]}]},{"name":"National Institutes of Health","award":["T32 GM136597"],"award-info":[{"award-number":["T32 GM136597"]}]},{"name":"National Institutes of Health","award":["S10 OD028584"],"award-info":[{"award-number":["S10 OD028584"]}]},{"name":"National Science Foundation"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"accepted":{"date-parts":[[2025,7,5]]},"abstract":"<jats:p>Chronic exposure to traffic-related air pollution (TRAP) is linked to increased risk of neurodegenerative diseases, including Alzheimer disease (AD). Ultrafine particulate matter (UFPM) is a suspected driver of TRAP neurotoxicity, but its spatial interactions with AD pathology remain poorly defined. We investigated the distribution, composition, and pathological context of TRAP-derived UFPM in the hippocampus of TgF344-AD rats chronically exposed to TRAP or filtered air (FA) for 14 months. Using a multimodal imaging workflow that combines enhanced darkfield hyperspectral imaging (EDF-HSI) with confocal immunofluorescence for microglia (CD68\/Iba1) and amyloid beta (A\u03b2) plaques (Thioflavin S), we mapped the localization and spectral properties of UFPM in situ. UFPM accumulation was elevated in TRAP-exposed females, suggesting sex-specific vulnerability in blood-brain barrier (BBB) permeability or particle retention. Particles near plaques showed red-shifted spectral signatures, consistent with biochemical transformation. Dimension reduction revealed clustering of particle spectra by TRAP exposure and plaque proximity. However, UFPM was rarely found within plaques or microglia, implying indirect neuroimmune modulation. These findings highlight a novel spatial and spectral imaging approach for characterizing environmental nanoparticle interactions in the brain and suggest that chronic TRAP exposure may influence AD-related inflammation and pathology in a sex- and region-dependent manner.<\/jats:p>","DOI":"10.1101\/2025.07.01.662638","type":"posted-content","created":{"date-parts":[[2025,7,5]],"date-time":"2025-07-05T22:00:21Z","timestamp":1751752821000},"source":"Crossref","is-referenced-by-count":0,"title":["Spatial and spectral mapping of traffic-related air pollution (TRAP) nanoparticles in relation to plaques and inflammatory markers in an Alzheimer disease model"],"prefix":"10.64898","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-1843-9332","authenticated-orcid":false,"given":"Hannah J","family":"O'Toole","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Anchaleena","family":"James","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0000-2793-5787","authenticated-orcid":false,"given":"Nathifa","family":"Nasim","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1184-9558","authenticated-orcid":false,"given":"Dustin J","family":"Hadley","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Elizabeth J","family":"Hale","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Qing","family":"He","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4865-2951","authenticated-orcid":false,"given":"Keith J","family":"Bein","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9507-355X","authenticated-orcid":false,"given":"Anthony E","family":"Valenzuela","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9805-1353","authenticated-orcid":false,"given":"Tatu","family":"Rojalin","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2141-8855","authenticated-orcid":false,"given":"Brittany N","family":"Dugger","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1565-814X","authenticated-orcid":false,"given":"Anthony S","family":"Wexler","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7665-7584","authenticated-orcid":false,"given":"Pamela J.","family":"Lein","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8193-1664","authenticated-orcid":false,"given":"Randy P","family":"Carney","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"54368","container-title":[],"original-title":[],"link":[{"URL":"https:\/\/syndication.highwire.org\/content\/doi\/10.1101\/2025.07.01.662638","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2026,6,24]],"date-time":"2026-06-24T05:06:16Z","timestamp":1782277576000},"score":1,"resource":{"primary":{"URL":"http:\/\/biorxiv.org\/lookup\/doi\/10.1101\/2025.07.01.662638"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2025,7,5]]},"references-count":0,"URL":"https:\/\/doi.org\/10.1101\/2025.07.01.662638","relation":{"is-preprint-of":[{"id-type":"doi","id":"10.1016\/j.envpol.2026.127730","asserted-by":"subject"}]},"subject":[],"published":{"date-parts":[[2025,7,5]]},"subtype":"preprint"}}