EGCG-stimulated increases in HO-1 protein expression did not require MEK, PI3K, or NOS activity. HAEC were serum-starved for 1 h and then pre-treated without or with various pathway-selective chemical inhibitors for 1 h (PD = PD98059, 25 μM; LY = LY294002, 50 μM; L-NAME, 100 μM). This was followed by treatment without or with EGCG (2.5 μM, 6 h). Cell lysates were immunoblotted using antibodies against HO-1, HO-2, and β-actin as indicated. Immunoblots shown are representative results from at least 3 independent experiments.