doi: 10.1161/CIRCULATIONAHA.105.535294
(Circulation. 2005;112:1813-1824.)
© 2005 American Heart Association, Inc.
Basic Science for Clinicians |
Role of Angiogenesis in Cardiovascular Disease
A Critical Appraisal
From BHF Laboratories, Department of Medicine, University College London, London, UK (R.K., J.F.M., I.C.Z.), and Section of Cardiology, Dartmouth Hitchcock Medical Center, Lebanon, NH (M.S.).
Correspondence to Dr I.C. Zachary, BHF Laboratories, Department of Medicine, Rayne Bldg, University College London, 5 University St, London WC1E 6JJ, UK. E-mail I.Zachary{at}ucl.ac.uk
Received January 11, 2005; revision received April 22, 2005; accepted April 29, 2005.
The role of angiogenesis in atherosclerosis and other cardiovascular diseases has emerged as a major unresolved issue. Angiogenesis has attracted interest from opposite perspectives. Angiogenic cytokine therapy has been widely regarded as an attractive approach both for treating ischemic heart disease and for enhancing arterioprotective functions of the endothelium; conversely, a variety of studies suggest that neovascularization contributes to the growth of atherosclerotic lesions and is a key factor in plaque destabilization leading to rupture. Here, we critically review the evidence supporting a role for angiogenesis and angiogenic factors in atherosclerosis and neointima formation, emphasizing the problems raised by some of the landmark studies and the suitability of animal models of atherosclerosis and neointimal thickening for investigating the role of angiogenesis. Because many of the relevant studies have focused on the role of vascular endothelial growth factor (VEGF), we consider this work in the wider context of VEGF biology and in light of recent experience from clinical trials of VEGF and other angiogenic cytokines for ischemic heart disease. Also discussed are recent findings suggesting that, although angiogenesis may contribute to neointimal growth, it is not required for the initiation of intimal thickening. Our assessment of the evidence leads us to conclude that, although microvessels are a feature of advanced human atherosclerotic plaques, it remains unclear whether angiogenesis either plays a central role in the development of atherosclerosis or is responsible for plaque instability. Furthermore, current evidence from clinical trials of both proangiogenic and antiangiogenic therapies does not suggest that inhibition of angiogenesis is likely to be a viable therapeutic strategy for cardiovascular disease.
Key Words: angiogenesis • atherosclerosis • endothelium • growth substances
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