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Enhanced neointimal growth in cultured rabbit aorta following in vivo balloon angioplasty

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Summary

We have used in vivo balloon catheterization in combination with in vitro organ culture to develop a model system for vascular neointima formation. A Fogarty balloon catheter was used to deendothelialize and rupture the internal elastic lamina of aortae in adult rabbits. After three d of recovery, aortae were harvested, divided into segments, and placed into organ culture. We obtained a daily index of cell proliferation in cultured vessels using [3H]thymidine incorporation into DNA. Also, segments were collected and processed for routine histology or immunohistochemistry. Aortic segments that had undergone ballooning 3 d before harvest and then cultured exhibited diffuse neointimal growth after several d in vitro, whereas those from sham-operated (nonballooned) rabbits showed generally only a single endothelial cell layer that is characteristic of normal intima. Aortae that were harvested, balloon-damaged in vitro, and then cultured exhibited no neointimal growth. The neointima that developed in cultured segments from in vivo ballooned rabbits was primarily of smooth muscle cell origin as determined by positive immunostaining for α-smooth muscle actin. The intima:media thickness ratios were significantly higher in aortic segments from ballooned rabbits at harvest and after 4 or 7 d in culture compared with those from nonballooned rabbits. Also, the [3H]thymidine index was higher in the in vivo ballooned aorta compared to non-ballooned or in vitro ballooned vessel. We conclude that ballooning in vivo followed by exposure to blood-borne elements produces an enhanced proliferative response in cultured vessels that is distinct from other in vitro models of neointimal growth.

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  1. Dalton Cardiovascular Research Center and the Departments of Physiology and Pharmacology, University of Missouri, 65211, Columbia, Missouri

    William E. Dale, Peter S. Batra & Edward H. Blaine

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  2. Peter S. Batra
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Dale, W.E., Batra, P.S. & Blaine, E.H. Enhanced neointimal growth in cultured rabbit aorta following in vivo balloon angioplasty. In Vitro Cell.Dev.Biol.-Animal 34, 805–812 (1998). https://doi.org/10.1007/s11626-998-0035-8

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  • DOI: https://doi.org/10.1007/s11626-998-0035-8

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