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(Circulation. 2002;105:2524.)
© 2002 American Heart Association, Inc.

Basic Science Reports

Vascular Endothelial Growth Factor Enhances Cardiac Allograft Arteriosclerosis

Karl B. Lemström, MD, PhD; Rainer Krebs, MSc; Antti I. Nykänen, MD; Jussi M. Tikkanen, MD; Roope K. Sihvola, MD; Eva M. Aaltola, MSc; Pekka J. Häyry, MD, PhD; Jeanette Wood, PhD; Kari Alitalo, MD, PhD; Seppo Ylä-Herttuala, MD, PhD; Petri K. Koskinen, MD, PhD

From Cardiopulmonary Research Group, Transplantation Laboratory (K.B.L., R.K., A.I.N., J.M.T., R.K.S., E.M.A., P.K.K.), Transplantation Laboratory (P.J.H.), University of Helsinki and Helsinki University Central Hospital, Helsinki, Finland; Department of Medicine, Division of Nephrology (P.K.K.), Department of Cardiothoracic Surgery (K.B.L.), Helsinki University Central Hospital, Molecular Cancer Biology Laboratory (K.A.), Biomedicum Helsinki, University of Helsinki, Helsinki, Finland; A.I. Virtanen Institute for Molecular Sciences (S.Y-H.), University of Kuopio, Kuopio, Finland; and Novartis Pharma (J.W.), Basle, Switzerland.

Correspondence to Karl Lemström, MD, Cardiopulmonary Research Group, Transplantation Laboratory, University of Helsinki and Helsinki University Central Hospital, PO Box 21 (Haartmaninkatu 3), FIN-00014 University of Helsinki, Finland. E-mail Karl.Lemstrom{at}helsinki.fi

Background— Cardiac allograft arteriosclerosis is a complex process of alloimmune response, chronic inflammation, and smooth muscle cell proliferation that includes cross talk between cytokines and growth factors.

Methods and Results— Our results in rat cardiac allografts established alloimmune response as an alternative stimulus capable of inducing vascular endothelial growth factor (VEGF) mRNA and protein expression in cardiomyocytes and graft-infiltrating mononuclear inflammatory cells, which suggests that these cells may function as a source of VEGF to the cells of coronary arteries. Linear regression analysis of these allografts with different stages of arteriosclerotic lesions revealed a strong correlation between intragraft VEGF protein expression and the development of intimal thickening, whereas blockade of signaling downstream of VEGF receptor significantly reduced arteriosclerotic lesions. In addition, in cholesterol-fed rabbits, intracoronary perfusion of cardiac allografts with a clinical-grade adenoviral vector that encoded mouse VEGF₁₆₄ enhanced the formation of arteriosclerotic lesions, possibly secondary to increased intragraft influx of macrophages and neovascularization in the intimal lesions.

Conclusions— Our findings suggest a positive regulatory role between VEGF and coronary arteriosclerotic lesion formation in the allograft cytokine microenvironment.

Key Words: angiogenesis • muscle, smooth • arteriosclerosis • transplantation • rejection

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