Troglitazone Inhibits Vascular Endothelial Growth Factor–Induced Angiogenic Signaling via Suppression of Reactive Oxygen Species Production and Extracellular Signal–Regulated Kinase Phosphorylation in Endothelial Cells

• Published in: Journal of Pharmacological Sciences 2009, Vol.111(1), pp.1-12
• Main Authors: Park, Byung Chul, Thapa, Dinesh, Lee, Jong Suk, Park, Su-Young, Kim, Jung-Ae
• Format: Article
• Language: English
• Subjects: angiogenesis; Angiogenesis Inhibitors - pharmacology; Animals; Cell Proliferation - drug effects; Cells, Cultured; Chick Embryo; Chromans - pharmacology; Endothelial Cells - drug effects; Endothelial Cells - metabolism; Extracellular Signal-Regulated MAP Kinases - metabolism; extracellular signal–regulated kinase (ERK); Female; Humans; matrix metalloproteinase (MMP); Matrix Metalloproteinase 1 - drug effects; Matrix Metalloproteinase 2 - drug effects; Neovascularization, Physiologic - drug effects; Phosphorylation - drug effects; reactive oxygen species (ROS); Reactive Oxygen Species - metabolism; Signal Transduction - drug effects; Thiazolidinediones - pharmacology; Troglitazone; Vascular Endothelial Growth Factor A - antagonists & inhibitors; Vascular Endothelial Growth Factor A - pharmacology
• ISSN: 1347-8613; 1347-8648
• DOI: 10.1254/jphs.08305FP

Thiazolidinediones, peroxisome proliferators-activated receptor gamma (PPARγ) ligands, have been recognized as a potential therapeutic agents for the treatment of pathological neovascularization. In the present study, we examined the molecular mechanism by which troglitazone (TROG), a PPARγ agonist, exerts its inhibitory action in vascular endothelial growth factor (VEGF)-induced angiogenesis signaling. In an in vitro angiogenesis model using human umbilical vein endothelial cells, TROG (20 μM) significantly suppressed VEGF-induced cell proliferation and invasion of the cells into the Matrigel basement membrane, which was not reversed by treatment with PPAR antagonists, GW 9662 (10 μM) and bisphenol A diglycidyl ether (10 μM). TROG also blocked VEGF-induced reactive oxygen species (ROS) production and its downstream extracellular signal–regulated kinase (ERK) phosphorylation, and this inhibitory effect was not reversed by GW9662 (10 μM). The antiangiogenic activity of TROG correlated with suppression of VEGF-induced matrix metalloproteinase (MMP)-2 and membrane type 1 (MT1)-MMP expression. In addition, the effects of TROG on VEGF-induced MMP-2 and MT1-MMP expression were comparable to those of the NADPH oxidase inhibitor diphenylene iodium (10 μM) and ERK inhibitor PD98056 (10 μM). Furthermore, in an in vivo angiogenesis system using a chick chorioallantoic membrane model, TROG dose-dependently inhibited VEGF-induced angiogenesis, which was similar to the inhibitory effect of N-acetylcysteine on VEGF-induced angiogenesis. The results suggest that the inhibitory effects of TROG on VEGF-induced angiogenesis were mediated through the suppression of VEGF-induced ROS production and ERK phosphorylation.