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Here, we show that depriving ECs of glutamine or inhibiting glutaminase 1 (GLS1) caused vessel sprouting defects due to impaired proliferation and migration, and reduced pathological ocular angiogenesis. Inhibition of glutamine metabolism in ECs did not cause energy distress, but impaired tricarboxylic acid (TCA) cycle anaplerosis, macromolecule production, and redox homeostasis. Only the combination of TCA cycle replenishment plus asparagine supplementation restored the metabolic aberrations and proliferation defect caused by glutamine deprivation. Mechanistically, glutamine provided nitrogen for asparagine synthesis to sustain cellular homeostasis. While ECs can take up asparagine, silencing asparagine synthetase (ASNS, which converts glutamine-derived nitrogen and aspartate to asparagine) impaired EC sprouting even in the presence of glutamine and asparagine. Asparagine further proved crucial in glutamine-deprived ECs to restore protein synthesis, suppress ER stress, and reactivate mTOR signaling. These findings reveal a novel link between endothelial glutamine and asparagine metabolism in vessel sprouting.","is_dataset_classified":null,"base_score":5.820082930352362,"endowment":5.820082930352362,"datacite_reuse_total":25,"file_count":0,"downloads":0,"views":0,"has_version_chain":false,"is_dataset":false,"is_oa":false,"pmid":"28659375","pmcid":"PMC5556263","openalex_id":"https://openalex.org/W2729019185","authors":[],"funders":[{"funder_name":"European Molecular Biology Organization","grant_id":"ALTF 306‐2014","title":null},{"funder_name":"Federal Government Belgium","grant_id":"IUAP7/03","title":null},{"funder_name":"Concerted Research Activities Belgium","grant_id":"GOA2006/11","title":null},{"funder_name":"ERC","grant_id":"EU‐ERC269073","title":null},{"funder_name":"British Heart Foundation","grant_id":"FS/12/80/29821","title":null},{"funder_name":"Fonds Wetenschappelijk Onderzoek","grant_id":"KAN 1.5.184.14","title":null},{"funder_name":"Fonds Wetenschappelijk 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Hypoxia, and Metabolism","Angiogenesis and VEGF in Cancer","Ubiquitin and proteasome pathways","0301 basic medicine","03 medical and health sciences","0303 health sciences"],"mesh_terms":["Asparagine","Cell Movement","Culture Media","Glutaminase","Glutamine","Humans","Neovascularization, Pathologic","Neovascularization, Physiologic","Endothelial Cells","Cell Proliferation","Metabolic Networks and Pathways","Human Umbilical Vein Endothelial Cells"],"keywords":["Glutamine","Asparagine","Biology","Asparagine synthetase","Citric acid cycle","Biochemistry","Metabolism","Glutaminase","Angiogenesis","Cell biology","Amino acid","Cancer research","Endothelial Cell","Biochemistry & Molecular Biology","TUMOR-CELLS","Neovascularization, Physiologic","MAMMALIAN-CELLS","Cell Movement","Human Umbilical Vein Endothelial Cells","Humans","CANCER CELLS","11 Medical and Health Sciences","ACUTE LYMPHOBLASTIC-LEUKEMIA","GENE-EXPRESSION","Cell Proliferation","Science & Technology","Neovascularization, 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