A, Glycolysis data are calculated and expressed as extracellular acidification rate (ECAR). Glycolysis and glycolytic capacity in SIRT3 KO-ECs are rescued by the treatment of DMOG (1 mM). B, Treatment with DMOG results in a decrease in maximal respiration in WT-ECs and SIRT3 KO-ECs. However, the basal OCR remains unchanged in SIRT3 KO-ECs. *p<0.05 vs. corresponding vehicle. C, EC tube formation was assessed using a Matrigel assay. Images represented WT and SIRT3 KO-EC network formation at 6 hours of incubation. Quantifications of EC network formation reveals a significant decrease in total length and number of junctions for SIRT3 KO-ECs versus WT-ECs. In the presence of 1 mM DMOG, SIRT3 KO-ECs network formation is improved at 6 hours, as indicated by a significant increase in the number of total branching length in the DMOG treated group. *p<0.05 vs. WT-EC+Vehicle. †p<0.05 vs. SIRT3 KO-EC+Vehicle. Data are representative of 3 independent experiments.