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The actions of cysteinyl leukotrienes (CysLTs) are mediated by activating CysLT receptors, CysLT1, and CysLT2. The CysLT1 receptor mediates vascular responses to CysLTs; however, its effect on the proliferation and migration of endothelial cells is not clarified. To determine this effect, we observed proliferation and migration in EA.hy926 cells, a human endothelial cell line, and the involvement of activation of mitogen-activated protein kinases (MAPKs). We found that LTD4 did not affect the proliferation, but significantly stimulated the migration of endothelial cells. LTD4 also induced the phosphorylation of extracellular signal-regulated kinase (ERK) 1/2, but not those of p38 or JNK. The LTD4-induced migration and ERK1/2 phosphorylation were blocked by the CysLT1-receptor antagonist montelukast and the dual antagonist Bay u9773, but not by the CysLT2-receptor antagonist Bay cysLT2; the migration was also inhibited by the ERK1/2 inhibitor U0126. Our findings indicate that LTD4 stimulates the CysLT1 receptor–mediated migration of endothelial cells; this may be regulated by the ERK1/2 pathway. Keywords:: cysteinyl leukotriene receptor 1 (CysLT1), endothelial cell, proliferation, migration, extracellular signal-regulated kinase (ERK) 1 /2