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The functions of de novo SL synthesis in vascular endothelial cells (EC), which line the entire circulatory system, are not well understood. Here, we show that the de novo SL synthesis in EC not only regulates vascular development but also maintains circulatory and peripheral organ SL levels. Mice with an endothelial-specific gene knockout of SPTLC1 (\n                    <jats:italic>Sptlc1<\/jats:italic>\n                    ECKO), an essential subunit of the SPT complex, exhibited reduced EC proliferation and tip\/stalk cell differentiation, resulting in delayed retinal vascular development. In addition,\n                    <jats:italic>Sptlc1<\/jats:italic>\n                    ECKO mice had reduced retinal neovascularization in the oxygen-induced retinopathy model. Mechanistic studies suggest that EC SL produced from the de novo pathway are needed for lipid raft formation and efficient VEGF signaling. Post-natal deletion of the EC\n                    <jats:italic>Sptlc1<\/jats:italic>\n                    also showed rapid reduction of several SL metabolites in plasma, red blood cells, and peripheral organs (lung and liver) but not in the retina, part of the central nervous system (CNS). In the liver, EC de novo SL synthesis was important for acetaminophen-induced rapid ceramide elevation and hepatotoxicity. These results suggest that EC-derived SL metabolites are in constant flux between the vasculature, circulatory elements, and parenchymal cells of non-CNS organs. Taken together, our data point to the central role of the endothelial SL biosynthesis in maintaining vascular development, neovascular proliferation, non-CNS tissue metabolic homeostasis, and hepatocyte response to stress.\n                  <\/jats:p>","DOI":"10.7554\/elife.78861","type":"journal-article","created":{"date-parts":[[2022,10,5]],"date-time":"2022-10-05T06:15:23Z","timestamp":1664950523000},"update-policy":"https:\/\/doi.org\/10.7554\/elife.78861","source":"Crossref","is-referenced-by-count":21,"title":["Murine endothelial serine palmitoyltransferase 1 (SPTLC1) is required for vascular development and systemic sphingolipid homeostasis"],"prefix":"10.7554","volume":"11","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-7263-8658","authenticated-orcid":true,"given":"Andrew","family":"Kuo","sequence":"first","affiliation":[{"id":[{"id":"https:\/\/ror.org\/00dvg7y05","id-type":"ROR","asserted-by":"publisher"}],"name":"Vascular Biology Program, Boston Children\u2019s 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