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The present study examined the potential role of DNMT isoforms in regulating glucose\u2010induced metabolic memory and associated changes in endothelial metabolism leading to diabetic complications. The study involved micro\/macro vascular endothelial cells (ECs), high\u2010fat diet (HFD)\u2010induced diabetic mouse models, and subjects with diabetic retinopathy (DR) at varying enforced levels of glycemia. Immunoblotting and HPLC\u2010based analysis were performed to examine the expression of DNMT isoforms and global DNA methylation levels. Reactive oxygen species (ROS) and inflammatory mediators were analyzed by Spectramax and multiplex ELISA respectively. Cell cycle analysis and angiogenesis assays were performed by flowcytometry and 3D spheroid assays. Integrated omics analysis using LC\u2013MS and RRBS was performed to identify metabolic and epigenomic signatures of metabolic memory. Candidate genes were validated in clinically characterized individuals with DR by RT\u2010PCR. High glucose and AGEs persistently elevated expression of the DNMT1 but not DNMT3A and DNMT3B despite glucose normalization. Global DNA methylation, DNA synthesis, angiogenesis, oxidative stress, inflammatory mediators, and nucleotide metabolism intermediates were elevated and sustained despite glucose normalization. Metabolic memory was associated with differential methylation of genes associated with vascular functions and nucleotide metabolism. We observed persistent DNA methylation of\n                    <jats:italic>IMPDH2,<\/jats:italic>\n                    the rate\u2010limiting enzyme of purine metabolism. DNMT1 and IMPDH2 were elevated in retinal and umbilical vein endothelial cells in\u00a0vitro, as well as retinal and aortic tissues of the HFD mice despite dietary intervention, which were reduced upon treatment with 5\u2010aza\u20102\u2032\u2010deoxycytidine.\n                    <jats:italic>IMPDH2<\/jats:italic>\n                    transcripts were elevated in subjects with DR undergoing antidiabetic therapy and in the exosomes derived from the vitreous of subjects with proliferative DR. Mycophenolate mofetil, a pharmacological inhibitor of IMPDH2, decreased sustained levels of DNMT1 and impeded sprout formation in 3D endothelial cultures induced by transient hyperglycemic conditions. Our study provides novel insights into the biology of metabolic memory by identifying IMPDH2 regulated by DNMT1 during epigenetic and metabolic reprogramming, with clinical relevance to the pathogenesis of DR.\n                  <\/jats:p>","DOI":"10.1096\/fj.202502260rr","type":"journal-article","created":{"date-parts":[[2025,12,25]],"date-time":"2025-12-25T08:22:09Z","timestamp":1766650929000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":6,"title":["Glucose Induces DNMT1\/IMPDH2\u2010Dependent Metabolic Memory in Endothelial Cells Upon Reprograming Nucleotide Metabolism"],"prefix":"10.1096","volume":"40","author":[{"given":"Sampara","family":"Vasishta","sequence":"first","affiliation":[{"name":"Department of Ageing Research, Manipal School of Life Sciences Manipal Academy of Higher Education  Manipal 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