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Am J Physiol Heart Circ Physiol 296: H1532-H1539, 2009. First published February 27, 2009; doi:10.1152/ajpheart.00566.2008
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Negligible contribution of coronary adventitial fibroblasts to neointimal formation following balloon angioplasty in swine

Bradley S. Fleenor1,2 and Douglas K. Bowles1,2,3,4

1Department of Biomedical Sciences, 2Research Cath Laboratory, 3Dalton Cardiovascular Research Center, and 4Department of Medical Pharmacology and Physiology, University of Missouri, Columbia, Missouri

Submitted 27 May 2008 ; accepted in final form 15 February 2009

Adventitial fibroblasts have previously been proposed to be a major constituent of the neointima following coronary balloon angioplasty. The present study utilized the bromodeoxyuridine (BrdU) pulse-chase technique to track adventitial fibroblast migration early after balloon injury in swine. BrdU (30 mg/kg), a marker of proliferating cells, was given intravenously 1 or 2 days after balloon angioplasty. For each time point, one animal was euthanized 24 h after injection to identify the location of the proliferating cells, while a second animal was euthanized 25 days after angioplasty to determine whether the proliferating cells migrated to form the neointima. Our results demonstrate that BrdU-positive cells were located primarily in the adventitia with all three time points 24 h after balloon angioplasty. Furthermore, when BrdU was injected on day 1 or 2 only 0.65 ± 0.17% and 1.7 ± 0.64%, respectively, of neointimal cells were BrdU positive on day 25. In conclusion, these results demonstrate a negligible contribution of coronary adventitial fibroblasts to neointima formation following coronary balloon angioplasty, supporting the concept that the neointima is primarily of smooth muscle cell origin.

smooth muscle; migration; adventitia


Address for reprint requests and other correspondence: D. K. Bowles, E102 Veterinary Medicine Bldg., 1600 E. Rollins, Univ. of Missouri, Columbia, MO 65211 (e-mail: bowlesd{at}missouri.edu)






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