[Angiotensin II increases the expression of lectin-like oxidize low-density lipoprotein receptor- 1 in cultured human umbilical vein endothlial cells]

OBJECTIVE: To observe whether angiotensin II (AngII) influences expression of lectin-like oxidized low density lipoprotein receptor-1 (LOX-1) in cultured human umbilical vein endothlial cells(HUVECs). METHODS: Cultured HUVECs were incubated with 10(-5)mol/L approximate, equals 10(-10) mol/L AngII for 24 h or with 10(-6) mol/L AngII for various time up to 48 h. Then HUVECs LOX-1 protein expression was measured by endothlial cell enzyme linked immunosorbent assay, and mRNA level of LOX-1 was detected by quantitative competitive reverse transcription-polymerase chain reaction. RESULTS: Incubation of HUVECs with AngII for 24 h significantly increased LOX-1 protein expression (P<0.001). The increase was dependent on AngII concentration (10(-5)mol/L approximate, equals 10(-9)mol/L). LOX-1mRNA expression was also induced by AngII, and after 24 h incubation of AngII(10(-5)mol/L approximate, equals 10(-8)mol/L), LOX-1mRNA expression increased 4.43, 4.25, 2.71, 1.84 times, respectively. After treatment with 10(-6) mol/L AngII for 3 h, LOX-1 expression (protein and mRNA) was elevated (P<0.001) in HUVECs, reaching its maxium at 24 approximate, equals 36 h. CONCLUSION: AngII upregulates LOX-1 expression concentration-dependently and time-dependently in HUVECs.