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While endothelial cells are known to transport excess nutrients to white adipose tissue (WAT) for energy storage, how their metabolic state impacts this process remains unclear. Here, we identify MYCT1 as a conserved, pan-endothelial protein essential for WAT expansion. Endothelial-specific MYCT1 deletion limited WAT expansion independently of angiogenesis, adipogenesis, or systemic metabolic parameters. Mechanistically, MYCT1 interacted with the transmembrane endolysosomal proteins IFITM2\/3 to restrict nutrient consumption by the vascular barrier. Loss of MYCT1 caused IFITM2\/3 accumulation in early endosomes, promoting excessive endolysosomal degradation and mTORC1 hyperactivation, limiting the WAT energy storage capacity. Notably, endothelial-specific mTORC1 activation through TSC1 deletion phenocopied the fat storage defects of MYCT1 deficiency. Our findings establish the MYCT1\u2013IFITM2\/3 complex as endothelial metabolic checkpoint regulating systemic energy storage. Targeting MYCT1\u2013IFITM2\/3 may offer new therapeutic options for obesity and metabolic disorders.<\/jats:p>","DOI":"10.1084\/jem.20251497","type":"journal-article","created":{"date-parts":[[2026,3,25]],"date-time":"2026-03-25T15:33:19Z","timestamp":1774452799000},"update-policy":"https:\/\/doi.org\/10.1084\/jem.crossmarkpolicy","source":"Crossref","is-referenced-by-count":1,"title":["MYCT1\u2013IFITM2\/3 interaction links endothelial endolysosomal trafficking to white adipose tissue expansion"],"prefix":"10.1084","volume":"223","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-7935-743X","authenticated-orcid":true,"given":"Laureline","family":"Wetterwald","sequence":"first","affiliation":[{"id":[{"id":"https:\/\/ror.org\/019whta54","id-type":"ROR","asserted-by":"publisher"}],"name":"University of Lausanne 1 Department of Fundamental Oncology, , Lausanne,","place":["Switzerland"]},{"name":"Ludwig Institute for Cancer Research Lausanne 2 , 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