Molecules and Cells

Korean Society for Molecular and Cellular Biology (한국분자세포생물학회)
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Angiotensin II Promotes Smooth Muscle Cell Proliferation and Migration through Release of Heparin-binding Epidermal Growth Factor and Activation of EGF-Receptor Pathway

  • Yang, Xiaoping (Center for Cardiovascular Research and Alternative Medicine, University of Wyoming) ;
  • Zhu, Mei J. (Department of Animal Science, University of Wyoming) ;
  • Sreejayan, N. (Center for Cardiovascular Research and Alternative Medicine, University of Wyoming) ;
  • Ren, J. (Center for Cardiovascular Research and Alternative Medicine, University of Wyoming) ;
  • Du, Min (Center for Cardiovascular Research and Alternative Medicine, University of Wyoming)
  • Received : 2005.06.14
  • Accepted : 2005.07.13
  • Published : 2005.10.31
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Abstract

Transactivation of EGF-receptor (EGFR) by G-protein coupled receptors (GPCRs) is emerging as an important pathway in cell proliferation, which plays a crucial role in the development of atherosclerotic lesion. Angiotensin II (Ang II) has been identified to have a major role in the formation of atherosclerotic lesions, although the underlying mechanisms remain largely unclear. We hypothesize that Ang II promotes the proliferation and migration of smooth muscle cells through the release of heparin-binding epidermal growth factor like growth factor (HB-EGF), transactivation of EGFR and activation of Akt and Erk 1/2, with matrix metalloproteases (MMPs) playing a dispensable role. Primary rat aortic smooth muscle cells were used in this study. Smooth muscle cells rendered quiescent by serum deprivation for 12 h were treated with Ang II (100 nM) in the presence of either GM6001 ($20{\mu}M$), a specific inhibitor of MMPs or AG1478 ($10{\mu}M$), an inhibitor of EGFR. The levels of phosphorylation of EGFR, Akt and Erk 1/2 were assessed in the cell lysates. Inhibition of MMPs by GM6001 significantly attenuated Ang II-stimulated phosphorylation of EGFR, suggesting that MMPs may be involved in the transactivation of EGFR by Ang II receptor. Furthermore Ang II-stimulated proliferation and migration of smooth muscle cells were significantly blunted by inhibiting MMPs and EGFR and applying HB-EGF neutralization antibody, indicating that MMPs, HB-EGF and EGFR activation is necessary for Ang-II stimulated migration and proliferation of smooth muscle cells. Our results suggest that inhibition of MMPs may represent one of the strategies to counter the mitogenic and motogenic effects of Ang II on smooth muscle cells and thereby prevent the formation and development of atherosclerotic lesions.

Keywords

References

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