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( Doo Sun Sim ),( Jin Sook Kwon ),( Yong Sook Kim ),( Hae Chang Chung ),( Young Joon Hong ),( Hyung Wook Park ),( Ju Han Kim ),( Myung Ho Jeong ),( Jeong Gwan Cho ),( Jong Chun Park ),( Jung Chaee Kan 한국조직공학·재생의학회 2009 조직공학과 재생의학 Vol.6 No.4
Aptamers, capture molecules(oligonucleotides) for endothelial progenitor cells(EPCs), are able to recognize circulating EPCs and to bind them. To evaluate effects of the aptamer-coated stent, six pigs were utilized and three different stents-cobalt-chromium bare-metal stent(CC), paclitaxel-eluting Taxus stent(Boston Scientific, Natick, Massachusetts)(TA), and aminoparylene and aptamer-coated stent (AA)-were implanted in the three epicardial coronary arteries in a random fashion at 8 to 10 atm. Stent length and diameter was 18 mm and 3 mm. After one month, the animals underwent follow-up coronary angiography with acetylcholine(10 mL, 3 ug/mL) stimulation test and were euthanized for histologic analysis. There was a decrease in MLD in all stents: CC(12.3 ± 5.5%), TA(10.4 ± 3.7%), and AA(11.2 ± 6.3%). There was, however, no statistical difference between the groups. Neointimal thickness was lower in TA. During the acetylcholine stimulation test, severe spasm (total occlusion) was noted in 1 pig at the proximal and distal edges of the Taxus stent. Re-endothelialization score was 3.40 ± 0.52, 1.33 ± 0.52, and 3.60 ± 0.55 in CC, TA, and AA, respectively. Thrombus appearance rate was 0/6, 4/6, and 1/6 in CC, TA, and AA, respectively. The AA showed a tendency toward lower incidence of stent thrombosis and endothelial dysfunction than TA. However, the inhibition of neointimal hyperplasia was not different between CC and AA.