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20-hydroxyeicosatetraenoic acid (20-HETE) induces endothelial dysfunction and is correlated with diabetes.This study was designed to investigate the effects of 20-HETE on endothelial insulin signaling.Human umbilical vein endothelial cells (HUVECs) or C57BL/6J mice were treated with 20-HETE in the presence or absence of insulin, and p-ERK1/2, p-JNK, IRS-1/PI3K/AKT/eNOS pathway, were examined in endothelial cells and aortas by immunoblotting.eNOS activity and nitric oxide production were measured.