Reviews |
Axis in Graft ArteriosclerosisFrom the Interdepartmental Program in Vascular Biology and Transplantation (G.T., J.S.P.) and the Departments of Surgery (G.T.) and Immunobiology (J.S.P.), Yale University School of Medicine, New Haven, Conn.
Correspondence to George Tellides, MD, PhD, 295 Congress Ave, BCMM 454, New Haven, CT 06510. E-mail george.tellides{at}yale.edu
This Review is part of a thematic series on Transplant Vasculopathy, which includes the following articles:
Interferon-
Axis in Graft Arteriosclerosis
Antibody and Complement in Transplant Vasculopathy
Allograft Vasculopathy Versus Atherosclerosis
Vascular Remodeling in Transplant Vasculopathy
Chemokines and Transplant Vasculopathy
Stem Cells and Transplant Vasculopathy
William Baldwin and Jordan Pober Guest Editors
Cardiac transplantation is the most effective treatment for advanced heart failure. Despite improvements in immunosuppression therapy that prevent acute rejection, cardiac allografts fail at rates of 3% to 5% per posttransplant year. The hallmark morphological lesion of chronically failing cardiac allografts, also seen in chronic renal and liver graft failure, is luminal stenosis of blood vessels, especially of conduit arteries. Late graft failure results from widespread secondary ischemic injury to the graft parenchyma rather than direct immune-mediated damage. Although this process affects the entire graft vasculature, graft arteriosclerosis is a suitable term to describe the problem because it applies to different types of failing organs and because it emphasizes the central feature, namely an accelerated form of arterial injury and remodeling. The precise pathogenesis of graft arteriosclerosis is unknown. In this review, we make the case that the signature T-helper type 1 cytokine, interferon (IFN)-
, is a key effector in graft arteriosclerosis, which, together with the IFN-
inducing cytokine interleukin-12 and IFN-
inducible chemokines such as CXCR3 ligands, constitute a positive feedback loop for T-cell activation, differentiation, and recruitment that we refer to as the IFN-
axis. We evaluate the evidence to support this hypothesis in clinical observational and experimental animal studies. Additionally, we examine the regulation of IFN-
production within the artery wall, the effects of IFN-
on vessel wall cells, and the outcome of therapeutic agents on IFN-
production and signaling. These observations lead us to suggest that new therapies for graft arteriosclerosis should be optimized which focus on reducing IFN-
synthesis or actions.
Key Words: interferon-
coronary arteries cardiac transplantation T cells vascular cells
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