Deletion of the p66Shc Longevity Gene Reduces Systemic and Tissue Oxidative Stress, Vascular Cell Apoptosis, and Early Atherogenesis in Mice Fed a High-Fat Diet

Proc Natl Acad Sci U S A. 2003 Feb 18;100(4):2112-6. doi: 10.1073/pnas.0336359100. Epub 2003 Feb 5.

Abstract

Several experimental and clinical studies have shown that oxidized low-density lipoprotein and oxidation-sensitive mechanisms are central in the pathogenesis of vascular dysfunction and atherogenesis. Here, we have used p66(Shc-/-) and WT mice to investigate the effects of high-fat diet on both systemic and tissue oxidative stress and the development of early vascular lesions. To date, the p66(Shc-/-) mouse is the unique genetic model of increased resistance to oxidative stress and prolonged life span in mammals. Computer-assisted image analysis revealed that chronic 21% high-fat treatment increased the aortic cumulative early lesion area by approximately 21% in WT mice and only by 3% in p66(Shc-/-) mice. Early lesions from p66(Shc-/-) mice had less content of macrophage-derived foam cells and apoptotic vascular cells, in comparison to the WT. Furthermore, in p66(Shc-/-) mice, but not WT mice, we found a significant reduction of systemic and tissue oxidative stress (assessed by isoprostanes, plasma low-density lipoprotein oxidizability, and the formation of arterial oxidation-specific epitopes). These results support the concept that p66(Shc-/-) may play a pivotal role in controlling systemic oxidative stress and vascular diseases. Therefore, p66(Shc) might represent a molecular target for therapies against vascular diseases.

Publication types

  • Research Support, Non-U.S. Gov't
  • Research Support, U.S. Gov't, P.H.S.

MeSH terms

  • Adaptor Proteins, Signal Transducing*
  • Adaptor Proteins, Vesicular Transport*
  • Animals
  • Apoptosis / genetics*
  • Arteriosclerosis / genetics*
  • Dietary Fats / administration & dosage*
  • Endothelium, Vascular / cytology*
  • Gene Deletion*
  • Immunohistochemistry
  • Lipids / blood
  • Longevity / genetics*
  • Male
  • Mice
  • Mice, Knockout
  • Oxidative Stress*
  • Proteins / genetics*
  • Shc Signaling Adaptor Proteins
  • Src Homology 2 Domain-Containing, Transforming Protein 1

Substances

  • Adaptor Proteins, Signal Transducing
  • Adaptor Proteins, Vesicular Transport
  • Dietary Fats
  • Lipids
  • Proteins
  • Shc Signaling Adaptor Proteins
  • Shc1 protein, mouse
  • Src Homology 2 Domain-Containing, Transforming Protein 1