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This study investigates the role of sphingolipid metabolism in maintaining endolysosomal membrane integrity and its impact on tau aggregation and toxicity in\n                    <jats:italic>Caenorhabditis elegans<\/jats:italic>\n                    and human cell culture models. Fluorescence recovery after photobleaching and C-Laurdan dye imaging revealed that silencing sphingolipid metabolism genes reduced endolysosomal vesicle membrane fluidity, increasing their rupture. The accumulation of aggregated tau in endolysosomal vesicles further aggravated endomembrane rigidification and damage, and promoted seeded tau aggregation, potentially by facilitating the escape of tau seeds from the endolysosomal system. Supplementation with unsaturated fatty acids improved membrane fluidity, suppressing endolysosomal rupture and seeded tau aggregation in cell models, and alleviating tau-associated neurotoxicity in\n                    <jats:italic>C. elegans<\/jats:italic>\n                    . Together, this study provides mechanistic insight into how perturbation of sphingolipid metabolism promotes endolysosomal membrane damage and contributes to the escape of aggregated tau from this compartment, suggesting that restoration of membrane fluidity may represent a strategy to limit tau propagation and toxicity.\n                  <\/jats:p>","DOI":"10.7554\/elife.106865","type":"journal-article","created":{"date-parts":[[2025,5,30]],"date-time":"2025-05-30T10:31:01Z","timestamp":1748601061000},"update-policy":"https:\/\/doi.org\/10.7554\/elife.106865","source":"Crossref","is-referenced-by-count":0,"title":["Disruption of sphingolipid metabolism promotes tau seeding through endolysosomal membrane rigidification and 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