Figure 3From: Polygonum viviparum L. induces vasorelaxation in the rat thoracic aorta via activation of nitric oxide synthase in endothelial cells Polygonum viviparum (PV) promoted an increase in nitric oxide (NO) production by human umbilical vein endothelial cells (HUVECs). Cells were treated with 3, 10, 30, and 100 μg/ml PV for 1 h. Medium was then collected for NO detection using the Griess reagent. Data are expressed as the mean ± standard error of the mean (S.E.M.) for more than 5 individual determinations. Treatment with acetylcholine (ACh) was used as a positive control. * p < 0.05, ** p < 0.01, significantly different from the control.Back to article page