Figure 4. Inhibition of p38 or reactive oxygen species (ROS) prevents Arg-II-induced eNOS-uncoupling and SASP. Young HUVECs were transduced with rAd empty vector as a control (Con) or rAd/CMV-Arg-II. The p38 inhibitor SB203580 (10 μmol/L) and ROS scavenger N-acetyl-cystein (NAC, 5 mmol/L) were added right after transduction. (A) DHE and DAF-2DA staining for detection of superoxide anion and nitric oxide (NO), respectively. Quantification of the signals is presented below, n=4. (B) Cytokine production detected by ELISA in conditioned medium. n=3. *p<0.05, **p<0.01, ***p<0.001 vs control group (Con); #p<0.05, ###p<0.001 vs Arg-II group. Scale = 200μm.