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Arteriosclerosis, Thrombosis, and Vascular Biology. 2000;20:645-651

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(Arteriosclerosis, Thrombosis, and Vascular Biology. 2000;20:645.)
© 2000 American Heart Association, Inc.


Vascular Biology

Angiotensin II Stimulates Endothelial Vascular Cell Adhesion Molecule-1 via Nuclear Factor-{kappa}B Activation Induced by Intracellular Oxidative Stress

Maria E. Pueyo; Walter Gonzalez; Antonino Nicoletti; Françoise Savoie; Jean-François Arnal; Jean-Baptiste Michel

From INSERM U460 (M.E.P., W.G., F.S., J.-B.M.) and INSERM U430 (A.N.), Paris, and INSERM U397 (J.-F.A.), Toulouse, France.

Correspondence to Dr Maria E. Pueyo, INSERM U460, Faculté de Médecine Xavier Bichat, 16, rue Henri Huchard, 75018 Paris, France. E-mail pueyo{at}infobiogen.fr

Abstract—The recruitment of monocytes via the endothelial expression of vascular cell adhesion molecule-1 (VCAM-1) is a key step in the formation of the initial lesion in atherosclerosis. Because angiotensin (Ang) II may be involved in this process, we investigated its role on the signaling cascade leading to VCAM-1 expression in endothelial cells. Ang II stimulates mRNA and protein expression of VCAM-1 in these cells via the AT1 receptor. This effect was enhanced by NG-nitro-L-arginine methyl ester, a nitric oxide synthase inhibitor, and blocked by pyrrolidinedithiocarbamate, an antioxidant molecule. Ang II activated the redox-sensitive transcription factor nuclear factor-{kappa}B and stimulated the degradation of both inhibitor of {kappa}B (I{kappa}B){alpha} and I{kappa}Bß with different kinetics. The degradation of I{kappa}Bs induced by Ang II was not modified by incubation with exogenous superoxide dismutase and catalase, suggesting that this effect was not mediated by the extracellular production of O2-. In contrast, rotenone and antimycin, 2 inhibitors of the mitochondrial respiratory chain, inhibited the Ang II–induced I{kappa}B degradation, showing that generation of reactive oxygen species in the mitochondria is involved on Ang II action. BXT-51702, a glutathione peroxidase mimic, inhibited the effect of Ang II, and aminotriazole, an inhibitor of catalase, enhanced it, suggesting a role for H2O2 in I{kappa}B degradation. This is confirmed by experiments showing that Ang II stimulates the intracellular production of H2O2 in endothelial cells. These results demonstrate that Ang II induced an intracellular oxidative stress in endothelial cells, which stimulates I{kappa}B degradation and nuclear factor-{kappa}B activation. This activation enhances the expression of VCAM-1 and probably other genes involved in the early stages of atherosclerosis.


Key Words: endothelium • nuclear factor-{kappa}B • I{kappa}B • superoxide anions • hydrogen peroxide




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