Evaluation of neointimal hyperplasia on tranilast-coated synthetic vascular grafts: An experimental study

Karakayali, Feza
Haberal, Nihan
Tufan, Hale
Hasırcı, Nesrin
BaSaran, Ozgur
Sevmis, Sinasi
Akdur, Aydin
Kızıltay, Aysel
Haberal, Mehmet
Tranilast is an antiallergic drug that interferes with proliferation and migration of vascular smooth muscle cell induced by platelet-derived growth factor (PDGF) and transforming growth factor-beta 1 (TGF-beta 1). We investigated the local effect of tranilast on neointimal hyperplasia using tranilastcoated prosthetic grafts. The inner sides of the thin-walled polytetrafluoroethylene (PTFE) grafts were coated with chitosan and tranilast containing chitosan solution. Wistar albino rats (32) were used in the study. Patches (1 x 2 mm) for vascular grafts were prepared. Three groups were tested: group 1 (n = 12; tranilast coated), group 2 (n = 10; adhesive-only film-layer-coated), and group 3 (n = 10; normal ePTFE patch grafts sutured to the carotid arteries of the rats). Recipient sites of the carotid arteries were excised 4 weeks after surgery. All sections were examined histologically for graft patency, thrombus formation, and neointimal thickness. Expression of PDGF, fibroblast growth factor, and TGF-beta 1 on cross-sections of the neointima were evaluated by immunohistochemistry. No significant differences were found regarding mean neointimal thicknesses. PDGF and TGF-beta-1 expressions were significantly lower in group 1. Although a decrease in local effect of tranilast was observed for growth factor expressions at a drug concentration of 0.05 mg/cm(2), a significant reduction in neointimal hyperplasia was not achieved. The coating concentration of 0.05 mg/cm(2) may have been too low to produce an antiproliferative effect. Given our promising results, further studies are recommended and planned using different drug concentrations and time intervals.
Citation Formats
F. Karakayali et al., “Evaluation of neointimal hyperplasia on tranilast-coated synthetic vascular grafts: An experimental study,” pp. 167–173, 2007, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/30366.