PMID: 8960504Nov 1, 1996Paper

The role of the adventitia in the arterial response to angioplasty: the effect of intravascular radiation

International Journal of Radiation Oncology, Biology, Physics
J N WilcoxN A Scott

Abstract

In the current series of experiments we have characterized cell proliferation leading to vascular lesion formation in a porcine model for post-angioplasty restenosis and examined the mechanism of action of intravascular beta irradiation in the prevention of lesion formation in this model. Juvenile male pigs were subjected to balloon overstretch injury of the left anterior descending and circumflex coronary arteries using clinical angioplasty catheters. Proliferating cells were labelled by injections of 50 mg/kg of bromo-deoxyuridine (BrDU) 24, 16 and 8 hrs prior to sacrifice and were detected by immunohistochemistry using a specific antibody to BrDU. In some cases, BrDU was given as a pulse 3 days after angioplasty and the animals sacrificed on day 14 to follow the migration of the cells which had proliferated earlier. Characterization of the proliferating cells was performed by immunohistochemistry using antibodies to specific cytoskeletal proteins specific for smooth muscle cells and myofibroblasts. Some vessels were treated at the time of angioplasty with 14 or 28 Gy (to a depth of 2 mm) intravascular irradiation using a flexible catheter with a pure beta emitter 90 SR/Y and the effect on cell proliferation and terminal tran...Continue Reading

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