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Pigment epithelium-derived factor (PEDF) blocks angiotensin II signaling in endothelial cells via suppression of NADPH oxidase: a novel anti-oxidative mechanism of PEDF

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Abstract

Angiotensin II (Ang II), the dominant effector of the renin–angiotensin system, regulates numerous inflammatory–proliferative responses in vascular wall cells and is thus involved in atherosclerosis. We have previously shown that pigment epithelium-derived factor (PEDF) inhibits advanced glycation end-product-induced pericyte apoptosis, thereby exerting beneficial effects on diabetic retinopathy. However, a role for PEDF in vascular inflammation and atherosclerosis remains to be elucidated. In this study, we have examined whether PEDF inhibits the Ang-II-induced endothelial cell (EC) activation in vitro and the way that it might achieve this effect. Ang II significantly induced redox-sensitive transcriptional factor NF-κB activation and subsequent monocyte chemoattractant protein-1 expression in human umbilical vein ECs (HUVEC), both of which were completely inhibited by PEDF or the anti-oxidant N-acetylcysteine. PEDF or diphenylene iodonium, an inhibitor of NADPH oxidase, inhibited Ang-II-induced intracellular reactive oxygen species (ROS) generation in HUVEC. Furthermore, PEDF inhibited Ang-II-induced up-regulation of mRNA levels of p22phox, Nox4, and gp91phox/Nox2, which are membrane components of NADPH oxidase, and its enzymatic activity in HUVEC. Antisense, but not sense, DNAs against p22phox, Nox4, or gp91phox/Nox2 were found significantly to inhibit Ang-II-induced ROS generation in HUVEC. These results demonstrate that PEDF inhibits Ang-II-induced EC activation by suppressing NADPH-oxidase-mediated ROS generation and that PEDF may play a protective role in the development and progression of atherosclerosis.

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Authors and Affiliations

  1. Department of Internal Medicine III, Kurume University School of Medicine, 67 Asahi-machi, Kurume, 830-0011, Japan

    Sho-ichi Yamagishi, Kazuo Nakamura & Tsutomu Imaizumi

  2. Department of Nephrology, Kurume University School of Medicine, Kurume, Japan

    Seiji Ueda

  3. Department of Pathology, Kurume University School of Medicine, Kurume, Japan

    Seiya Kato

Authors
  1. Sho-ichi Yamagishi
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  2. Kazuo Nakamura
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  3. Seiji Ueda
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  4. Seiya Kato
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  5. Tsutomu Imaizumi
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Correspondence to Sho-ichi Yamagishi.

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This work was supported in part by grants from the Venture Research and Development Centers from the Ministry of Education, Culture, Sports, Science and Technology, Japan (S.Y.) and the Ichiro Kanehara Foundation, Japan (S.Y.).

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Yamagishi, Si., Nakamura, K., Ueda, S. et al. Pigment epithelium-derived factor (PEDF) blocks angiotensin II signaling in endothelial cells via suppression of NADPH oxidase: a novel anti-oxidative mechanism of PEDF. Cell Tissue Res 320, 437–445 (2005). https://doi.org/10.1007/s00441-005-1094-8

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