{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,1,21]],"date-time":"2026-01-21T00:43:52Z","timestamp":1768956232056,"version":"3.49.0"},"reference-count":90,"publisher":"MDPI AG","issue":"6","license":[{"start":{"date-parts":[[2025,5,28]],"date-time":"2025-05-28T00:00:00Z","timestamp":1748390400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"The McLaughlin Research Institute"},{"name":"Oakland family"},{"DOI":"10.13039\/100000057","name":"National Institute of General Medical Sciences","doi-asserted-by":"crossref","award":["P20GM152335"],"award-info":[{"award-number":["P20GM152335"]}],"id":[{"id":"10.13039\/100000057","id-type":"DOI","asserted-by":"crossref"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Biomolecules"],"abstract":"<jats:p>Endosomal dysfunction is one of the earliest cellular signs in Alzheimer\u2019s disease. Tumor susceptibility gene 101 protein (TSG101) is a component of the endosomal sorting complex required for transport (ESCRT)-I, which plays a key role in sorting ubiquitinated cell surface proteins and lipids onto intraluminal vesicles of multivesicular bodies for trafficking to lysosomes or autophagosomes for degradation, or to the plasma membrane for exosomal secretion. TSG101-dependent trafficking has been implicated in the propagation and spread of misfolded proteins associated with neurodegenerative diseases. We used transgenesis mice to study the in vivo consequences of disrupting TSG101-dependent trafficking in adult neurons. Mice lacking Tsg101 in forebrain neurons (Tsg101ck2-null) showed rapid loss of hippocampal neurons and progressive forebrain atrophy. Astrogliosis was apparent in the dentate gyrus within 1 week of deleting Tsg101, followed by apoptosis of hippocampal CA3 neurons and accumulation of the autophagy adapter P62\/SQSTM1 and ubiquitinated proteins. Failure to detect lipidated LC3 indicated autophagy was impaired rather than upregulated. Endosomal markers (RAB5 and RAB7) and amyloid protein also accumulated in hippocampal neurons of Tsg101ck2-null mice. Our data establish a critical role for TSG101 in neuronal survival and demonstrate the importance of the in vivo assessment of gene and protein functions.<\/jats:p>","DOI":"10.3390\/biom15060786","type":"journal-article","created":{"date-parts":[[2025,5,29]],"date-time":"2025-05-29T04:46:38Z","timestamp":1748493998000},"page":"786","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Neuronal Deletion of Tumor Susceptibility Gene 101 (Tsg101) Causes Rapid Apoptotic Loss of Hippocampal CA3 Neurons"],"prefix":"10.3390","volume":"15","author":[{"given":"Will P.","family":"Walker","sequence":"first","affiliation":[{"name":"McLaughlin Research Institute, Great Falls, MT 59405, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Megan Lea","family":"Ratz-Mitchem","sequence":"additional","affiliation":[{"name":"McLaughlin Research Institute, Great Falls, MT 59405, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5081-0226","authenticated-orcid":false,"given":"Kay-Uwe","family":"Wagner","sequence":"additional","affiliation":[{"name":"Department of Oncology, Center for Molecular Medicine and Genetics, Wayne State University, Detroit, MI 48202, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2688-6420","authenticated-orcid":false,"given":"Teresa M.","family":"Gunn","sequence":"additional","affiliation":[{"name":"McLaughlin Research Institute, Great Falls, MT 59405, USA"},{"name":"College of Osteopathic Medicine\u2014Montana, Touro University, Great Falls, MT 59405, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1968","published-online":{"date-parts":[[2025,5,28]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"885","DOI":"10.1016\/j.biopsych.2010.05.030","article-title":"Microarray analysis of hippocampal CA1 neurons implicates early endosomal dysfunction during Alzheimer\u2019s disease progression","volume":"68","author":"Ginsberg","year":"2010","journal-title":"Biol. 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