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This study aims to elucidate the impact of AD-associated post-translational modifications of tau-on-tau propagation. Tau propagation reporter constructs distinguishing donor cells from recipient cells were developed, and additional constructs were made with tau residues mutated from serine or threonine to aspartate to mimic the negative charge of a phosphorylation and\/or from lysine to glutamine to mimic the charge-neutralizing effect of acetylation. Flow cytometry was used to quantify donor and recipient cells. This revealed that the mutations generally tended to reduce tau propagation compared to wildtype tau. Recombinant tau containing either wildtype or posttranslational modification mimicking mutations were used to treat Chinese hamster ovary cells or human induced pluripotent stem cell-derived neurons to quantify tau uptake, revealing that the mutations generally resulted in reduced uptake compared to wildtype tau. Surface plasmon resonance revealed that the mutations had a reduced affinity for lipoprotein receptor-related protein 1 (LRP1), a tau uptake receptor, compared to wildtype tau. Overall, these results suggest that AD-associated posttranslational modification mimicking mutations reduce the cell-to-cell propagation of tau by reducing tau uptake by recipient cells, which may be in part due to reduced binding affinity to LRP1.<\/jats:p>","DOI":"10.1093\/jnen\/nlaf007","type":"journal-article","created":{"date-parts":[[2025,2,22]],"date-time":"2025-02-22T04:24:06Z","timestamp":1740198246000},"page":"459-470","source":"Crossref","is-referenced-by-count":5,"title":["Alzheimer disease-associated tau post-translational modification mimics impact tau propagation and uptake"],"prefix":"10.1093","volume":"84","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-0135-7928","authenticated-orcid":false,"given":"John R","family":"Dickson","sequence":"first","affiliation":[{"name":"Alzheimer Research Unit, Department of Neurology, Massachusetts General Hospital , Charlestown, MA,","place":["United States"]},{"name":"Faculty of Medicine, Harvard Medical School , Boston, MA,","place":["United States"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Robert G R","family":"Sobolewski","sequence":"additional","affiliation":[{"name":"Alzheimer Research Unit, Department of Neurology, Massachusetts General Hospital , Charlestown, MA,","place":["United States"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Analiese R","family":"Fernandes","sequence":"additional","affiliation":[{"name":"Alzheimer Research Unit, Department of Neurology, Massachusetts General Hospital , Charlestown, MA,","place":["United States"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Joanna M","family":"Cooper","sequence":"additional","affiliation":[{"name":"The Center for Vascular and Inflammatory Diseases, University of Maryland School of Medicine , Baltimore, MD,","place":["United States"]},{"name":"Department of Physiology, University of Maryland School of Medicine , Baltimore, MD,","place":["United States"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Zhanyun","family":"Fan","sequence":"additional","affiliation":[{"name":"Alzheimer Research Unit, Department of Neurology, Massachusetts General Hospital , Charlestown, MA,","place":["United States"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Mirra","family":"Chung","sequence":"additional","affiliation":[{"name":"Alzheimer Research Unit, Department of Neurology, Massachusetts General Hospital , Charlestown, MA,","place":["United States"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Cameron","family":"Donahue","sequence":"additional","affiliation":[{"name":"Alzheimer Research Unit, Department of Neurology, Massachusetts General Hospital , Charlestown, MA,","place":["United States"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Derek H","family":"Oakley","sequence":"additional","affiliation":[{"name":"Faculty of Medicine, Harvard Medical School , Boston, MA,","place":["United States"]},{"name":"Department of Pathology, C.S. 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