Inhibition of PKC attenuates ATP induced phosphorylation of eNOS. Prior to stimulation with 100 μM ATP with calcium, cells were treated with 30 μM of cheler for 2 min prior to stimulation. Cells were harvested before stimulation (t=0) and at time points 1, 3, 5, and 10 min after stimulation. All peNOS/eNOS ratios were normalized by t=0. Cheler treated cells showed an attenuated agonist stimulated phosphorylation of eNOS, which was statistically significant at 1 and 3 min (p<0.05 * one-tailed t-test, ATP w Ca+2 n=4, Cheler n=5).