Locally applied cilostazol suppresses neointimal hyperplasia by inhibiting tenascin-C synthesis and smooth muscle cell proliferation in free artery grafts

The Journal of Thoracic and Cardiovascular Surgery
Kazuya FujinagaIsao Yada

Abstract

Accumulation of smooth muscle cells and extracellular matrix in the intima of artery bypass grafts induces neointimal hyperplasia, resulting in graft failure. We investigated the inhibitory effect of locally applied cilostazol, an inhibitor of cyclic adenosine monophosphate phosphodiesterase III, on neointimal hyperplasia and the role of tenascin-C synthesis and smooth muscle cell proliferation in free artery grafts. Methods and results We established a distal anastomotic stricture model of free artery graft stenosis using rat abdominal aorta. In this model, neointimal hyperplasia was observed not only in the distal anastomotic site but also in the graft body at postoperative day 14 and was markedly progressed at day 28. Strong expression of tenascin-C was found in the media and neointima of the graft body. When cilostazol was locally administered around the graft using Pluronic gel, neointimal hyperplasia of the graft was significantly suppressed in comparison with gel-treated control graft. The mean neointima/media area ratio was reduced by 86.6% for the graft body and by 75.8% for the distal anastomotic site versus the control. Cilostazol treatment decreased cell proliferation and tenascin-C expression in the neointima. In a...Continue Reading

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