Objective To explore the expression of Notch signal by oxidized low-density lipoprotein( ox-LDL) in macrophages of human monocytic leukemia cell line( THP1) and to search for possible mechanism of atherosclerosis( AS). Methods Human macrophage from THP1 cell line transform by PMA was cultured with different concentration of ox-LDL at different time to induce proinflammatory response. The expression of four receptors and five ligands of Notch mRNA and protein were measured by RT-PCR and Western blot respecti...