Endothelial cell seeding influences lesion development following arterial injury in the cholesterol-fed rabbit

• Published in: Cardiovascular research Vol. 53; no. 2; pp. 502 - 511
• Main Authors: Conte, Michael S, VanMeter, Guy A, Akst, Lee M, Clemons, Tracy, Kashgarian, Michael, Bender, Jeffrey R
• Format: Journal Article
• Language: English
• Published: England 01.02.2002
• Subjects: Animals; Catheterization - adverse effects; Constriction, Pathologic; Endothelium, Vascular - pathology; Endothelium, Vascular - transplantation; Femoral Artery - diagnostic imaging; Femoral Artery - injuries; Femoral Artery - pathology; Hypercholesterolemia - pathology; Iliac Artery - diagnostic imaging; Iliac Artery - injuries; Iliac Artery - pathology; Microscopy, Electron, Scanning; Models, Animal; Rabbits; Radiography
• ISSN: 0008-6363
• DOI: 10.1016/S0008-6363(01)00486-2

A functionally intact endothelial monolayer is thought to be critical for the adaptive process of vascular remodeling. This study was undertaken to examine the hypothesis that endothelial restoration is a critical determinant of remodeling after balloon angioplasty. Rabbits (N=12) were fed a cholesterol-supplemented diet (0.5%) and were subjected to bilateral balloon catheter injury of the iliofemoral arteries. At the time of injury, autologous venous endothelial cells (ECs) were implanted on one artery; the contralateral vessel served as control. A mean of 42 days after injury, arteriography was performed, followed by vessel harvest and histologic analysis. High grade (> or =70%) stenoses or occlusion were present in 55% of control and none of the EC-seeded arteries. EC-seeding was associated with improved mean (1.0 +/- 0 vs. 0.7 +/- 0.1, P<0.001) and minimal (0.7 +/- 0.1 vs. 0.4 +/- 0.1, P<0.001) luminal diameters by angiography. Seeded arteries demonstrated decreased medial area (0.69 +/- 0.04 vs. 1.04 +/- 0.09 mm(2), P<0.001), a more uniform range of final lumen area (P<0.0001), and a positive remodeling index. Neointimal area was not significantly different. Stenoses were characterized primarily by larger neointimal area (2.02 +/- 0.18 vs. 1.38 +/- 0.09 mm(2), stenotic vs. non-stenotic, P<0.005). Final lumen area was strongly influenced by both neointimal growth and vessel remodeling. These data support the concept that endothelial restoration is a critical determinant of the outcome of vessel wall repair, particularly in the context of hypercholesterolemia.