- Akt-dependent phosphorylation of serine 1179 and mitogen-activated protein kinase kinase/extracellular signal-regulated kinase 1/2 cooperatively mediate activation of the endothelial nitric-oxide synthase by hydrogen peroxide. Cai, H., Li, Z., Davis, M.E., Kanner, W., Harrison, D.G., Dudley, S.C. Mol. Pharmacol. (2003)