Gene Delivery of Paraoxonase-1 Inhibits Neointimal Hyperplasia after Arterial Balloon-Injury in Rabbits Fed a High-Fat Diet

Abstract

Paraoxonase-1 (PON-1) is a high-density lipoprotein (HDL)−associated enzyme that hydrolyzes oxidized phospholipids, thereby preventing the oxidative modification of low-density lipoproteins (LDL). A high-fat diet reduces PON-1 activity, enhancing LDL oxidation. Thus, PON-1 is a candidate for anti-atherogenic gene therapy. In the present study, we investigated the effect of local PON-1 overexpression on the development of atherosclerotic lesions using the Sendai virus–mediated transgenic technique. One-month-old rabbits (n=11) were fed a high-fat diet for 8 weeks and then subjected to balloon injury of the common iliac artery and simultaneous infection with a Sendai virus vector containing the PON-1 gene (n=7) or enhanced green fluorescence protein (EGFP) gene as a control (n=4). The arteries were examined 7–10 days after the operation. Local overexpression of PON-1 almost completely eliminated the immunohistochemical signals of the lectin-like oxidized LDL receptor-1 (LOX-1), thereby inhibiting macrophage accumulation, intimal thickening (by 63% compared with control), or atherosclerotic plaque formation in the vascular lumen (by 87.5%). Decreased levels of oxidative stress in the PON-1−treated arteries were confirmed by 4-hydroxy-2-nonenal (HNE) staining. Local overexpression of PON-1 in the arteries attenuated oxidative stress, thereby inhibiting the atherosclerotic process. Delivery of the PON-1 gene may be a possible therapeutic strategy for preventing atherosclerosis.

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Correspondence to Miwa Miyoshi.

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Miyoshi, M., Nakano, Y., Sakaguchi, T. et al. Gene Delivery of Paraoxonase-1 Inhibits Neointimal Hyperplasia after Arterial Balloon-Injury in Rabbits Fed a High-Fat Diet. Hypertens Res 30, 85–91 (2007). https://doi.org/10.1291/hypres.30.85

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Keywords

  • paraoxonase-1
  • atherosclerosis
  • gene therapy
  • lectin-like oxidized low-density lipoprotein receptor-1
  • oxidative stress

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