(Circulation. 2002;105:633.)
© 2002 American Heart Association, Inc.
Basic Science Reports |
B Significantly Contributes to Lumen Loss in a Rabbit Iliac Artery Balloon Angioplasty Model
From the Department of Vascular Biology and Thrombosis Research (J.M.B., A.K., G.B., S.S., Y.K., J.L., R.D.M., B.R.B.); Division of Angiography and Interventional Radiology (M.C., Z.X., J.L.), Department of Radiology; and Department of Biomedical Research (H.B., U.L.), University of Vienna, Austria.
Correspondence to Bernd R. Binder, Department of Vascular Biology and Thrombosis Research, University of Vienna, Schwarzspanierstrasse 17, A-1090 Vienna, Austria. E-mail bernd.binder{at}univie.ac.at
Background To investigate the contribution of inflammation to postangioplasty lumen loss, we used an adenoviral gene therapy approach to inhibit the central inflammatory mediator nuclear factor-
B (NF-
B) by overexpression of its natural inhibitor, I
B
.
Methods and Results The adenovirus carrying human I
B
was applied immediately after balloon dilatation by a double-balloon catheter in a rabbit iliac artery restenosis model. Immunohistochemistry of I
B
revealed that mainly smooth muscle cells of the media but also cells of the adventitia were transduced and expressed the transgene I
B
for
8 days. At this time point, intercellular adhesion molecule-1 (30%) and monocyte chemotactic protein-1 (50%) expression, as well as recruitment of macrophages into the wounded area (90%), were significantly reduced in I
B
-treated vessels. In addition, expression of inhibitor of apoptosis proteins was reduced and the percentage of apoptotic cells was increased compared with control-treated contralateral vessels. Animals killed 5 weeks after treatment exhibited a significantly reduced degree of lumen narrowing (P<0.02) on the side treated with adenovirus I
B
. The lumen gain of
40% was due to positive remodeling.
Conclusions From these data, we conclude that balloon angioplastyinduced activation of NF-
B contributes to lumen loss likely via induction of an inflammatory response and a decrease in the rate of apoptosis. These data show for the first time that inflammation mediated by NF-
B is involved in postangioplasty lumen narrowing. Specific and more potent inhibitors of NF-
B might therefore be a useful therapeutic measure to improve clinical outcome after balloon dilatation.
Key Words: restenosis inflammation gene therapy nuclear factor-
B apoptosis
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