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. 1993 Apr;91(4):1469–1480. doi: 10.1172/JCI116352

Proliferative activity in peripheral and coronary atherosclerotic plaque among patients undergoing percutaneous revascularization.

J G Pickering 1, L Weir 1, J Jekanowski 1, M A Kearney 1, J M Isner 1
PMCID: PMC288122  PMID: 8097207

Abstract

We evaluated the proliferative activity of human atherosclerotic lesions associated with active symptoms of ischemia, by assessing the expression of the proliferating cell nuclear antigen (PCNA). We confirmed in vitro that PCNA, an essential component of the DNA synthesis machinery, is selectively expressed in proliferating human vascular smooth muscle cells. 37 atherosclerotic lesions (18 primary and 19 restenotic) retrieved by directional atherectomy from either coronary or peripheral arteries were then studied for the expression of PCNA, using in situ hybridization or immunohistochemistry. Among plaques studied by in situ hybridization, 7 out of 11 primary and 11 out of 11 restenotic lesions contained PCNA-positive cells. The mean rate of proliferation (percent of PCNA-positive cells) was 7.2 +/- 10.8% in primary lesions and 20.6 +/- 18.2% in restenotic lesions (P < 0.05). Among specimens studied by immunohistochemistry, five out of seven primary and eight out of eight restenotic lesions contained proliferating cells. The mean rate of proliferation was again higher in the restenotic (15.2 +/- 13.6%) than primary (3.6 +/- 3.5%) lesions (P < 0.05). Proliferating cells were detected as late as 1 yr after angioplasty. We conclude that cellular proliferation is a feature of atherosclerotic lesions which are associated with symptoms of ischemia, but that it is more prominent in restenosis compared to primary lesions. These findings have implications for therapies aimed at limiting lesion growth, particularly after percutaneous revascularization.

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